JP6682671B2 - Seal member for slush molding - Google Patents

Description

  The present invention relates to a slush molding seal member used for manufacturing a skin-like member such as a skin material constituting an instrument panel of an automobile, for example.

  2. Description of the Related Art Conventionally, for example, a technique of slush molding using a resin powder material as a raw material is known for manufacturing a skin-like member such as a skin material constituting an automobile instrument panel. For slush molding, a mold as a mold and a reservoir tank that stores the powder material in a box-shaped storage section with an opening on the top surface and receives the powder material on the molding surface of the mold when the mold is attached. The equipment configuration provided is used. The slush molding is performed by the following process, for example.

  First, the mold is heated in advance to about 230 ° C. by a predetermined means, the heated mold is attached to the reservoir tank containing the powder material, and the mold and the reservoir tank are united. The mold is attached to the reservoir tank so that the molding surface side faces the powder material side housed in the reservoir tank and the opening side of the reservoir tank is closed. In the state where the mold and the reservoir tank are united, the mold and the reservoir tank form an integral internal space including the accommodation space of the accommodation portion of the reservoir tank. This internal space serves as a moving space for the powder material.

  That is, the powder material in the reservoir tank is moved to the molding surface side of the mold by rotating the mold and the reservoir tank that are combined with each other. As a result, the powder material in contact with the molding surface of the mold is melted by the heat of the mold and is adhered and molded along the molding surface. After molding the resin material, the rotational positions of the mold and the reservoir tank are returned to the original positions to move the excess powder material into the accommodating portion of the reservoir tank. Then, by cooling the mold to, for example, about 40 ° C., the molten resin material is cured and then released from the molding surface to obtain a skin-like member such as a skin material of an instrument panel as a molded product. .

  In such slush molding, in order to prevent the powder material from leaking from the internal space to the outside during rotation of the combined structure of the mold and the reservoir tank, the mold for forming the internal space and the reservoir tank are separated from each other. A seal portion for sealing the internal space is provided at the contact portion (contact portion). As such a seal portion, a structure in which a seal member made of an elastic material such as rubber is interposed in a contact portion of the reservoir tank with the mold is used (see, for example, Patent Document 1).

  As disclosed in Patent Document 1, the seal member is attached to the opening edge portion of the reservoir tank whose opening side is the mold side. Further, in Patent Document 1, as a seal member, a hollow portion for injecting a fluid is provided in a portion that comes into contact with a mold, and in a cross section, a surface side that is a contact side with the mold has a semicircular shape In addition, there is disclosed a sealing material having a bifurcated shape on the side opposite to the contact side so as to sandwich the opening edge of the reservoir tank.

Patent No. 5619679

  In the slush molding as described above, the mold repeatedly undergoes temperature changes due to heating and cooling, and therefore gradually deforms as a time-dependent effect. The deformation of the mold is a permanent strain, and is mainly a deformation in the expansion direction, that is, a deformation in a direction to widen the gap between the mold and the reservoir tank. The deformation amount of such deformation of the die becomes more remarkable as the die is larger.

  Therefore, according to the conventional seal member as described above, the deformation amount of the mold may be larger than the deflection amount of the seal member. That is, according to the conventional seal member, there is a case where it is not possible to obtain a sufficient flexure amount for following the deformation of the mold as a permanent strain. On the other hand, in order to increase the amount of bending of the seal member, it is conceivable to lengthen the dimension in the vertical direction that is the bending direction of the seal member. However, if the seal member is simply lengthened, the seal member will buckle as a whole. As a result, the flexural deformation of the seal member is not stable, and good sealability cannot be obtained.

  As described above, when the amount of deformation of the mold becomes larger than the amount of bending of the seal member, a gap is generated between the seal member and the mold, and the gap is generated when the mold and the reservoir tank are rotated together. There is a problem that powder material leaks from the outside. The leakage of the powder material to the outside leads to poor quality of the molded product and a decrease in yield.

  The present invention has been made in view of the above problems, and a seal member provided between a mold and a reservoir tank in slush molding is provided between the mold and the reservoir tank due to deformation of the mold. Slash molding that can obtain a sufficient amount of deflection to follow the change in the gap of the powder, prevent the powder material from leaking to the outside, and improve the quality of the molded product and the yield. It is an object of the present invention to provide a sealing member for a vehicle.

  A slush molding seal member according to the present invention is provided between a mold having a molding surface and a reservoir tank that contains powder material and receives the mounting of the mold to form a moving space for the powder material together with the mold. A slush molding seal member for sealing a contact-side tubular portion that forms a contact portion with the mold and forms a cavity along the longitudinal direction of the seal member, and the contact-side tubular portion with respect to the contact-side tubular portion. An intermediate space forming portion that is provided on the mounting side with respect to the edge portion of the reservoir tank and forms a space along the longitudinal direction of the seal member together with the contact side tubular portion, and a holding portion that holds the edge portion of the reservoir tank. And the intermediate space forming portion is formed of a pair of side wall portions facing each other in the width direction of the seal member, and the side wall portion has an inner wall surface with the upper portion. By including a sloped surface that is substantially symmetrical with respect to the direction and having a curved surface with the outer side in the width direction being the convex side in the vertical direction, the central portion in the vertical direction is the thinnest part Is.

  Another aspect of the seal member for slush molding according to the present invention is a mold having a molding surface, a powder material is housed, and the mold is attached to form a moving space for the powder material together with the mold. A sealing member for slush molding for sealing between a reservoir tank and a contact side tubular portion that forms a contact portion with the mold and forms a cavity along the longitudinal direction of the sealing member; An intermediate space forming portion that is provided on a mounting side of the edge portion of the reservoir tank with respect to the cylindrical portion and forms a space along the longitudinal direction of the seal member together with the contact side tubular portion; and an edge of the reservoir tank. The intermediate space forming portion includes a pair of side wall portions facing each other in the width direction of the seal member, and the contact-side tubular portion is a front portion. A top surface portion that forms a contact surface with the mold, a pair of side surface portions that face each other in the width direction of the seal member, a surface portion that faces the top surface portion, and is a cavity of the contact side tubular portion and the intermediate space forming portion. A partition wall partitioning the space formed by the contact surface, the contact surface is formed in a flat shape, and is formed so as to form an angle with the outer wall surface of the contact side tubular portion.

  In another aspect of the slush molding seal member according to the present invention, the top surface portion is formed to be thicker than the side surface portion.

  Further, in another aspect of the slush molding seal member according to the present invention, the side surface portion has an outer wall surface that is flat along the vertical direction of the seal member, and the inner wall surface is By having a curved surface with the outer side in the width direction as a convex side in the vertical direction, the thickness is gradually reduced from both ends to the central portion in the vertical direction.

  Further, in another aspect of the slush molding seal member according to the present invention, a dimension of the intermediate space forming portion in the width direction of the seal member is larger than a dimension of the contact side tubular portion in the width direction. Is.

  Further, in another aspect of the slush molding seal member according to the present invention, the side wall portion is a portion that is continuous with the sandwiching piece portion that forms the sandwiching portion, and the sandwiching piece portion with respect to the contact side tubular portion Forming a leg portion extending downward and having a cutout portion in a part of the longitudinal direction in which at least a part of the leg portion is cut out in order to bend or bend the seal member in the longitudinal direction. Is.

  According to the present invention, in the slush molding, regarding the seal member provided between the mold and the reservoir tank, the amount of deflection sufficient to follow the change in the gap between the mold and the reservoir tank due to the deformation of the mold. Therefore, the powder material can be prevented from leaking to the outside, and the quality of the molded product and the yield can be improved.

It is sectional drawing which shows the structure of the slush molding apparatus which concerns on one Embodiment of this invention. It is a figure showing a skin type and a rotation frame of a slush molding device concerning one embodiment of the present invention. It is a figure which shows the reservoir tank and rotary frame of the slush molding apparatus which concerns on one Embodiment of this invention. It is explanatory drawing about an example of the slush molding method which concerns on one Embodiment of this invention. It is a partial cross section figure which shows the structure of the seal part in the slush molding apparatus which concerns on one Embodiment of this invention. It is a partial cross-sectional perspective view which shows the structure of the seal part in the slush molding apparatus which concerns on one Embodiment of this invention. It is a cross-sectional view of a seal rubber according to an embodiment of the present invention. It is explanatory drawing about the seal part by the seal rubber of the comparative example with respect to the seal rubber which concerns on one Embodiment of this invention. It is explanatory drawing about the deformation aspect of the seal rubber which concerns on one Embodiment of this invention. It is explanatory drawing about the effect by the seal rubber which concerns on one Embodiment of this invention. It is a figure which shows an example of the usage aspect of the seal rubber which concerns on one Embodiment of this invention. It is a figure which shows the modification of the seal rubber which concerns on one Embodiment of this invention. It is a figure showing a use mode about a modification of seal rubber concerning one embodiment of the present invention. It is a figure showing other examples of composition of a modification of seal rubber concerning one embodiment of the present invention. It is a figure which shows the graph which represented an example of the relationship between the bending amount and load of the seal rubber which concerns on the Example of this invention.

  The present invention relates to a slush molding technique for molding a leather-like member using a resin powder material as a raw material, and devises a structure of a seal member for sealing between a mold and a reservoir tank containing the powder material. By doing so, it is possible to efficiently increase the amount of bending of the seal member, follow the changes in the gap between the mold and the reservoir tank due to thermal deformation of the mold, and prevent the powder material from leaking to the outside. Then, the quality of the molded product and the yield are improved. Hereinafter, embodiments of the present invention will be described.

  In the embodiment of the present invention, as an example of a skin-like member as a molded product by slush molding, a skin material forming an instrument panel that is an interior structure of an automobile will be described as an example. The instrument panel is, for example, a base material that is a relatively hard member formed by injection molding using a synthetic resin such as PP (polypropylene), and a molded product formed by slush molding that is a relatively soft member. A three-layer structure is formed by a skin material and a foam body formed by foaming a foam resin material such as polyurethane between the base material and the skin material. However, the present invention is widely applicable to slush molding for molding a skin-like member using a powder material as a raw material, such as slush molding using a skin material for an automobile door trim as a molded product, in addition to the skin material for an instrument panel. .

  First, the configuration of the slush molding device 1 according to the present embodiment will be described with reference to FIGS. 1, 2, and 3. As shown in FIGS. 1 to 3, a slush molding device 1 according to the present embodiment is for molding a skin material forming an instrument panel, and is a skin mold as a mold having a molding surface 2a. 2 and a reservoir tank 3 that receives the powder material 4 and receives the attachment of the skin material 2 to form a moving space 8 for the powder material 4 together with the skin material 2. The sectional views shown in FIGS. 1, 2B and 3B are sectional views taken along the line AA shown in FIGS. 2A and 3A.

  The skin type 2 is an electroforming mold made of nickel, which has excellent heat conductivity, and is configured as a plate-shaped member having a three-dimensional uneven shape corresponding to the shape of the skin material along the outer shape of the instrument panel as a whole. Has been done. The surface of the skin mold 2 on the concave side in its overall shape is a molding surface 2a. The skin die 2 according to the present embodiment has molding surface portions 2b corresponding to the respective skin materials at two locations in point symmetry in plan view so that two skin materials can be simultaneously molded on the molding surface 2a.

  The skin mold 2 has a rectangular outer shape in a plan view as shown in FIG. 2A, and has molding surface portions 2b on both sides divided into two in the lateral direction (the left-right direction in FIG. 2A). Have. The skin type 2 has a flange portion 2c having a substantially constant width, which is a horizontal plate-shaped portion, along the rectangular outer shape in plan view. The flange portion 2c is, at an end portion on the lower side (lower side in FIG. 2 (b)) of the skin mold 2, is perpendicular to an outer side of a vertical side wall portion 2d which is a peripheral portion of a portion forming the molding surface 2a. It is formed in a bent shape.

  In the following description, in the slush molding apparatus 1, the lateral direction (horizontal direction in FIG. 2A) in the rectangular plan view outer shape of the skin mold 2 is defined as the left-right direction, and the longitudinal direction in the outer shape (FIG. 2). The vertical direction in (a) is the front-back direction, and the direction in which the skin type 2 and the reservoir tank 3 face each other (the vertical direction in FIG. 1) is the vertical direction.

  The reservoir tank 3 has a tank main body 3a which is a box-shaped storage portion having an upper side as an opening side, and the powder material 4 is stored in the tank main body 3a. The reservoir tank 3 is made of a material such as aluminum or epoxy resin. As shown in FIG. 3A, the tank main body 3a has a rectangular outer shape in a plan view, and substantially the entire opening range on the upper side thereof is within the range of the molding surface 2a of the skin mold 2 in a plan view. Is provided.

  The reservoir tank 3 receives the attachment of the skin type 2 and forms an integral rotating body together with the skin type 2. That is, the skin type 2 and the reservoir tank 3 are configured to be rotatable about a predetermined rotation axis O1 along the front-rear direction by a rotation supporting device (not shown) having a motor or the like as a drive source in a state of being integrated with each other. There is.

  In the skin mold 2, the molding surface 2a side is directed to the powder material 4 side (lower side) housed in the tank body 3a of the reservoir tank 3, and the reservoir tank 3 is covered so as to close the opening side of the tank body 3a. It is attached. That is, the skin mold 2 and the reservoir tank 3 are combined with the molding surface 2a side and the opening side of the tank body portion 3a facing each other, and the powder material 4 in the tank body portion 3a is exposed to the molding surface 2a. In the state where the skin type 2 and the reservoir tank 3 are combined, the skin type 2 and the reservoir tank 3 form an integral internal space including a housing space of the tank body portion 3a. This internal space serves as a moving space 8 for the powder material 4. In the moving space 8 for the powder material 4, the rotary shaft O1 of the combined structure of the skin type 2 and the reservoir tank 3 is located.

  A rotary frame 5 is interposed between the skin type 2 and the reservoir tank 3 which are integrated with each other. That is, the skin type 2 and the reservoir tank 3 are fixed to each other via the rotating frame 5. The rotating frame 5 is a tubular member having a rectangular cross-sectional shape, and is configured in a rectangular frame shape in plan view along the flange portion 2c of the skin type 2.

  The rotary frame 5 is vertically sandwiched by a flange portion 2c of the skin type 2 and a support arm portion 3c protruding laterally outward from upper ends of the left and right side walls 3b of the tank body portion 3a in the reservoir tank 3. In this state, it is interposed between the skin type 2 and the reservoir tank 3. The support arm portions 3c are provided on each of the left and right side walls 3b at three locations spaced by a predetermined distance in the front-rear direction (see FIG. 3A).

  The skin type 2 and the reservoir tank 3 are fixed to the rotary frame 5 by a clamp mechanism 6, respectively. The clamp mechanism 6 is a toggle clamp mechanism having a clamp lever 6a as an operation unit for switching clamp / unclamp. Of the clamp mechanism 6, the clamp mechanism 6A for the skin type 2 clamps the flange portion 2c of the skin type 2 to the rotating frame 5, and the clamp mechanism 6B for the reservoir tank 3 is the clamp mechanism 6B for the reservoir tank 3. The support arm portion 3c is clamped to the rotary frame 5. Since a known mechanism is used as the clamp mechanism 6, a detailed description of the clamp mechanism 6 will be omitted.

  In the slush molding apparatus 1 according to the present embodiment, four clamping mechanisms 6A for the skin type 2 and three clamping mechanisms 6B for the reservoir tank 3 are provided on each of the left and right sides 5a of the rotary frame 5. The parts are alternately arranged at a predetermined interval in the front-rear direction. It should be noted that the clamp mechanism 6A for the skin type 2 and the clamp mechanism 6B for the reservoir tank 3 are substantially vertically symmetrical. In the following description, the combination structure of the skin mold 2 and the reservoir tank 3 which are combined by the clamp mechanism 6 via the rotating frame 5 and are rotatable about a predetermined rotation axis O1 is referred to as a “mold / tank combination structure”. ".

  In the slush molding apparatus 1, in order to prevent the powder material from leaking to the outside when the mold / tank united structure is rotated, a skin mold 2 and a reservoir tank 3 that form an internal space of the mold / tank united structure are defined. The seal portion 7 is provided at the contact portion (contact portion). The seal portions 7 are provided in the left and right molding surface portions 2b of the skin mold 2 endlessly (in a ring shape) along the uneven shape of the skin mold 2 and along the outer shape of the skin material (outer shape of the molding surface portion 2b) in plan view. Has been. That is, the seal portion 7 forms a boundary portion between the molding area (molding surface portion 2b) of the skin material on the molding surface 2a of the skin die 2 and its outer area in the mold / tank united configuration. The seal portion 7 has a seal rubber 10 as a seal member (a slush molding seal member) made of an elastic material such as rubber interposed in the contact portion of the reservoir tank 3 with the skin type 2. The details are as follows.

  The seal rubber 10 is attached to the upper end portion of the partition wall 11 provided on the upper side of the tank body portion 3a in the reservoir tank 3. The partition wall 11 has an outer wall portion 11a extending upward from an opening edge portion on the upper side of the tank body portion 3a, and an inner wall portion 11b located above the opening of the tank body portion 3a. The inner wall portion 11b is supported from below by a support column 13 that is erected on a horizontal member 12 that is erected in the left-right direction between the base end portions of the left and right outer wall portions 11a.

  The partition wall 11 is a substantially plate-shaped portion having a predetermined shape as a whole, and its upper edge portion (hereinafter referred to as “partition wall edge portion”) 11 c forms an endless seal portion 7. The partition wall edge portion 11c is provided so as to be along the uneven shape of the skin mold 2 and along the outer shape of the skin material (outer shape of the molding surface portion 2b) in plan view. That is, the partition wall edge portion 11 c is an end portion of the partition wall 11 on the side of contact with the molding surface 2 a of the skin mold 2, receives the seal rubber 10, and receives the seal rubber 10 from the lower side to the skin mold 2. The abutting contact constitutes the seal portion 7.

  Thus, in the present embodiment, the partition wall edge portion 11c corresponds to the edge portion of the reservoir tank 3. That is, the seal rubber 10 is attached to the partition wall edge portion 11 c facing the partition portion of the movement space 8 of the powder material 4 in the skin type 2, and seals between the skin type 2 and the reservoir tank 3.

  The seal rubber 10 is a long member having a constant cross-sectional shape, and is provided in an endless shape so as to cover the entire seal portion 7. The seal rubber 10 is formed by extrusion molding using silicone rubber having excellent heat resistance as a raw material.

  The powder material 4 as a raw material for the skin material is a material generally used in slush molding, and includes, for example, vinyl chloride resin powder, olefin-based thermoplastic elastomer (TPO) resin powder, and polyurethane-based thermoplastic elastomer ( TPU) resin powder and the like.

  Next, an example of a slush molding method performed by using the slush molding apparatus 1 according to this embodiment will be described with reference to FIG. Note that the clamp mechanism 6 is not shown in FIG.

  First, as shown in FIG. 4A, the skin mold 2 is placed in the heating furnace 14 and exposed to hot air of, for example, about 480 ° C. to heat it to a temperature of, for example, about 230 to 270 ° C. As a means for heating the skin mold 2, in addition to the heating furnace 14, for example, a pipe for circulating a heating medium such as heating oil is provided outside the skin mold 2 (on the side opposite to the molding surface 2a), and the inside of the pipe is A configuration in which the skin type 2 is heated by a circulating heating medium may be used.

  Next, as shown in FIG. 4B, the heated skin type 2 is attached to the reservoir tank 3 in which the powder material 4 is contained in the tank body 3a (see arrow C1), and the clamp mechanism 6 (see FIG. 1). Fixed by. As a result, the heated skin type 2 and the reservoir tank 3 containing the powder material 4 are combined to obtain a combined mold / tank configuration.

  Subsequently, as shown in FIG. 4C, the mold / tank united structure is rotated around the rotation axis O1 by a rotation support device (not shown) (see arrow C2). As a result, the powder material 4 moves in the internal space of the mold / tank united structure due to the load and is guided to the molding surface 2 a side of the skin mold 2.

  Then, as shown in FIG. 4 (d), the mold / tank united structure is turned upside down by the rotation operation about the rotation axis O 1, so that the powder material 4 is transferred to the molding surface 2 a side of the skin mold 2. It moves and comes into a state of being in full contact with the left and right molding surface portions 2b. As a result, the powder material 4 is melted by the heat of the skin mold 2, and the resin material 4a is adhered and molded along the surface shape of each molding surface portion 2b.

  After molding the resin material 4a, as shown in FIG. 4 (e), the rotational positions of the skin mold 2 and the reservoir tank 3 are returned to the original positions by the rotation operation about the rotation axis O1 of the mold / tank combination structure. The reservoir tank 3 is positioned on the lower side and the skin type 2 is positioned on the upper side, and the excess powder material 4 is moved into the tank body portion 3 a of the reservoir tank 3.

  Then, as shown in FIG. 4 (f), the clamp by the clamp mechanism 6 is released to remove the skin type 2 from the reservoir tank 3, and for example, the skin type 2 is immersed in a water tank (not shown) to apply a predetermined water pressure. For example, the skin mold 2 is cooled to a temperature of, for example, about 40 ° C. As a result, the resin material 4a is cured, and the cured resin material 4a is released from the skin mold 2 (see arrow C3) to obtain the skin material 15 of the instrument panel as a molded product.

  The skin material 15 has an uneven curved surface shape that matches the shape of the adhered portion with respect to the base material forming the instrument panel, and the outer surface thereof forms the design surface of the instrument panel. The thickness of the skin material 15 is, for example, about 1 mm.

  Hereinafter, in the slush molding apparatus 1 and the slush molding method according to the present embodiment as described above, the seal portion 7 and the seal rubber 10 that seal between the skin mold 2 and the reservoir tank 3 will be described in detail.

  The seal rubber 10 is an elongated member having a constant cross-sectional shape as described above, and its main configuration or form is specified by the cross-sectional shape. As shown in FIGS. 5 and 6, the seal rubber 10 is attached to the partition wall 11 with the lower side thereof being an open side and the partition wall edge portion 11c being inserted from the lower side. In the seal portion 7 and the seal rubber 10, the wall thickness direction of the partition wall 11 (horizontal direction in FIG. 5) is the horizontal direction, and the vertical direction in the slush molding apparatus 1 (vertical direction in FIG. 5) is the vertical direction.

  The seal rubber 10 is fixed to the partition wall 11 via mounting fittings 16 that sandwich the partition wall edge portion 11c from both left and right sides. The mounting member 16 is a bent plate-shaped member having a rectangular outer shape and a predetermined bent shape, and is a flat plate-shaped portion that is fixed to the partition wall 11 and a fixing portion 16 a and a side view. It has a substantially U-shaped bent portion and a locking portion 16b that locks the seal rubber 10.

  The mounting metal fitting 16 is such that the fixing portion 16a is aligned with the plate surface 11d of the partition wall 11, and the substantially U-shaped open side of the locking portion 16b faces the seal rubber 10 side. Is applied in a state in which the mounting bracket 16 is covered in the width dimension range. The pair of mounting members 16 are arranged at positions facing each other in a manner of sandwiching the partition wall edge portion 11c and the lower end portion of the seal rubber 10, and are fastened and fixed to the partition wall 11 by a bolt member 17 and a nut member 18.

  The bolt member 17 includes a mounting bracket 16 located on the left and right sides from one side in the left-right direction (left side in FIG. 5), a partition wall edge part 11 c located between the fixing parts 16 a of the pair of mounting brackets 16, and the left and right other parts. It penetrates through the mounting member 16 located on the side (right side in FIG. 5) and is screwed into two nut members 18 located on the other side in the left-right direction. For this reason, bolt holes 16e and 11e are formed in the mounting member 16 and the partition wall edge portion 11c, respectively, through which the bolt member 17 penetrates. With such a fixing structure, the seal rubber 10 is fixed in a state of being vertically positioned with respect to the partition wall edge portion 11c.

  In the structure for fixing the seal rubber 10 to the partition wall 11, the bolt hole 16e of the mounting member 16 is a long hole whose longitudinal direction is the vertical direction. As a result, the vertical position of the mounting member 16 with respect to the partition wall 11 can be adjusted, and the vertical position of the seal rubber 10 fixed to the partition wall 11 via the mounting member 16 with respect to the partition wall 11 can be adjusted. As a configuration for adjusting the position of the seal rubber 10 in the vertical direction, a configuration in which a plurality of bolt holes are provided in the vertical direction in the fixing portion 16a or the partition wall edge portion 11c, or a bolt hole 11e of the partition wall edge portion 11c. It may have a configuration in which the upper and lower sides are long holes. The fixing portions of the seal rubber 10 to the partition wall 11 by the pair of mounting members 16 and the like as described above are provided at a plurality of positions at appropriate intervals in the extending direction of the seal rubber 10.

  Next, the structure of the seal rubber 10 will be described. As shown in FIG. 5, FIG. 6 and FIG. 7, the seal rubber 10 forms a contact portion with the skin mold 2 and a contact side tubular portion 21 which forms a cavity 20 a along the longitudinal direction (extending direction) of the seal rubber 10. The holding portion 22 holds the partition wall edge portion 11c of the reservoir tank 3, and the intermediate space forming portion 23 provided between the contact-side tubular portion 21 and the holding portion 22.

  As described above, each part of the seal rubber 10 is a part that appears in the cross-sectional shape of the seal rubber 10, and is formed over the entire extending direction of the seal rubber 10 having a constant cross-sectional shape. In the cross-sectional shape of the seal rubber 10, the vertical direction is the longitudinal direction, and the seal rubber 10 has a bilaterally symmetrical shape.

  The contact-side tubular portion 21 is a hollow portion having a cavity 20a, and is a substantially tubular portion. In particular, in this embodiment, the contact-side tubular portion 21 has a substantially rectangular tubular outer shape.

  The sandwiching portion 22 has a pair of sandwiching piece portions 24 that form lower end portions on both sides of the seal rubber 10 in the width direction (left-right direction, hereinafter, also simply referred to as “width direction”). The pair of sandwiching pieces 24 are portions that sandwich the upper end portion of the partition wall edge portion 11c and receive the engagement of the mounting bracket 16.

  Specifically, the sandwiching piece portion 24 has a horizontal lower surface 24 a that is the lower end surface of the seal rubber 10 and a vertical surface 24 b that is the side surface of the lower end portion of the seal rubber 10. The corner portion between the lower end surface 24a and the side surface 24b is an R-shaped portion. In addition, a concave groove 25 is formed in the lower portion of the seal rubber 10, more specifically, in the boundary portion between the sandwiching portion 22 and the intermediate space forming portion 23, along the rectangular outer shape in the cross-sectional view, the outer side in the width direction being the open side. ing. The lower side surface 25a of the concave groove 25 is a surface that forms a substantially right angle with the side surface 24b of the sandwiching piece portion 24.

  Then, the mounting member 16 has the substantially U-shaped engaging portion 16b so as to surround the sandwiching piece portion 24 in a cross-sectional view, that is, the sandwiching piece portion 24 is fitted inside the engaging portion 16b. In a manner, it engages the seal rubber 10. Specifically, the locking portion 16b has a lower surface portion 16x, a side surface portion 16y, and an upper surface portion 16z as portions that form a substantially "U" shape. Then, in the mounting member 16, the lower surface portion 16x and the side surface portion 16y are made to face the lower end surface 24a and the side surface 24b of the sandwiching piece portion 24, respectively, and the upper surface portion 16z is positioned in the concave groove 25, and the end surface of the upper surface portion 16z is formed. 16c is engaged with the seal rubber 10 while being in contact with the bottom surface 25b of the concave groove 25.

  The sandwiching portion 22 is an example of a mounting portion of the seal rubber 10 to the partition wall edge portion 11c. The mounting portion of the seal rubber 10 is not limited to a portion such as the sandwiching portion 22 that sandwiches the partition wall edge portion 11c by the pair of sandwiching piece portions 24, and the seal rubber 10 is mounted in the mounting state of the seal rubber 10 to the partition wall edge portion 11c. It may be any portion as long as it supports the partition edge portion 11c.

  The intermediate space forming portion 23 is provided on the contact side tubular portion 21 on the side where the reservoir tank 3 is attached to the partition wall edge portion 11c, that is, on the side of the holding portion 22 (lower side). The intermediate space forming portion 23 is a portion that forms a space 23s along the longitudinal direction of the seal rubber 10 together with a portion of the contact side tubular portion 21 on the side of the sandwiching portion 22. The intermediate space forming portion 23 includes a pair of side wall portions 26 facing each other in the width direction of the seal rubber 10. A space 23s is formed between the pair of side wall portions 26. The space 23s is a substantially cylindrical space whose lower side is the open side.

  The intermediate space forming part 23 forms a cavity 20b along the longitudinal direction of the seal rubber 10 together with the sandwiching part 22 side (lower side) of the contact side tubular part 21 and the partition wall edge part 11c. That is, by inserting the partition wall edge portion 11c between the sandwiching piece portions 24 forming the sandwiching portion 22, the lower open side of the space 23s is closed by the partition wall edge portion 11c, and the cavity 20b is formed.

  In the example shown in FIG. 5 and the like, the cavity 20b includes the lower surface 21a of the contact side tubular portion 21, the inner wall surface 26a which is the inner wall surface of the pair of side wall portions 26 of the intermediate space forming portion 23, and the partition wall edge portion 11c. Is formed by the horizontal upper end surface 11f. However, depending on the vertical fixing position of the seal rubber 10 with respect to the partition wall edge portion 11c, the surface forming the cavity 20b may include the left and right plate surfaces 11d of the upper end portion of the partition wall edge portion 11c, or the sandwiching piece portion 24. The upper end portion of the inner side surface 24c is included.

  As described above, the seal rubber 10 is formed in the seal part 7 as the two space parts divided into the upper part and the lower part by the cavity 20a by the contact side tubular part 21, the intermediate space forming part 23 and the partition wall edge part 11c. And a cavity 20b to be formed. That is, the seal rubber 10 has a two-stage upper and lower space portion of the cavity 20a of the contact side tubular portion 21 and the space 23s of the intermediate space forming portion 23, and in addition to the upper cavity 20a, the space between the left and right side wall portions 26. 23s forms a cavity 20b closed from below by the partition wall edge 11c. As described above, the seal rubber 10 has a so-called two-layer structure of a portion forming the cavity 20a and a portion forming the cavity 20b. In the following description, the upper cavity 20a will be referred to as the upper cavity 20a, and the lower cavity 20b will be referred to as the lower cavity 20b.

  Below, the contact side tubular portion 21 and the intermediate space forming portion 23 of the seal rubber 10 according to the present embodiment will be described in detail.

  First, the contact side tubular portion 21 will be described in detail. The contact-side tubular portion 21 is a top surface portion 31 that forms a contact surface with the skin mold 2, a pair of side surface portions 32 that face each other in the width direction of the seal rubber 10, and a surface portion that faces the top surface portion 31 and is an upper cavity 20a. The partition wall part 33 which partitions off the lower cavity 20b (space 23s) is included.

  The top surface portion 31 is a horizontal plate-shaped portion that forms the upper end portion of the seal rubber 10. An upper surface 31 a of the top surface portion 31 is an upper end surface of the seal rubber 10 and serves as a contact surface with the skin mold 2. An upper surface 31a of the top surface portion 31 is formed in a flat shape, and is formed to form a corner 21d with an outer wall surface 21b which is an outer wall surface in the width direction of the contact side tubular portion 21. The outer wall surface 21b forms an upper part of the wall surface of the seal rubber 10 on the outer side in the width direction.

  In the present embodiment, the top surface 31a of the top surface portion 31 is formed in a horizontal plane shape. Further, the lower surface 31b of the top surface portion 31 is also formed in a horizontal plane like the upper surface 31a. Further, the outer wall surface 21b of the contact-side tubular portion 21 is a substantially vertical surface as a whole, and an upper surface 31a thereof has an inclined surface 21c forming an obtuse angle (for example, 100 to 110 °) with the upper surface 31a of the top surface portion 31. Has been formed. Therefore, the left and right slopes 21c are formed so that the upper end of the seal rubber 10 is gradually narrowed from the lower side to the upper side. In the present embodiment, the inclined surface 21c is formed in the outer wall surface 21b at a portion that is substantially the upper half of the plate thickness of the top surface portion 31. Further, the corner formed by the upper surface 31a and the slope 21c is an R-shaped portion.

  The left and right side surfaces 32 are substantially vertical plate-shaped portions that form the upper side wall of the seal rubber 10.

  The partition wall portion 33 is a substantially horizontal plate-shaped portion provided so as to be substantially parallel to the top surface portion 31 at a position below the top surface portion 31. The upper surface 33a of the partition 33 is a curved surface that is convex downward. The partition wall portion 33 is a portion that forms the space 23s together with the pair of side wall portions 26 of the intermediate space forming portion 23. The lower surface 33b of the partition wall 33 becomes the lower surface 21a of the contact-side tubular portion 21 forming the lower cavity 20b as described above.

  As described above, in the present embodiment, the contact-side tubular portion 21 includes the top surface portion 31, the pair of side surface portions 32, and the partition wall portion 33, and has a substantially rectangular tubular shape that forms a substantially rectangular frame shape in the cross section of the seal rubber 10. Is formed as a part of.

  Further, in the contact side tubular portion 21, the top surface portion 31 is formed to be thicker than the side surface portion 32. That is, as shown in FIG. 7, the thickness dimension D1 of the top surface portion 31 is larger than the maximum thickness dimension D2 of the side surface portion 32.

  In addition, in the contact-side tubular portion 21, the side surface portion 32 has a thin portion 32b at a part in the vertical direction, the thin portion 32b having a smaller thickness than other portions. In the present embodiment, the side surface portion 32 has a thin-walled portion 32b at the vertical center thereof.

  Specifically, the side surface portion 32 has a curved outer surface 32c that is flat along the up-down direction and that has an inner wall surface 32d that is convex on the outer side in the width direction of the seal rubber 10 in the up-down direction. The surface has a shape in which the thickness is gradually reduced from both ends to the central part in the vertical direction. That is, the left and right side surface portions 32 are curved surfaces having an arc shape with the outer side in the width direction being the convex side in the cross section of the seal rubber 10 with respect to the outer side wall surface 32c which is the vertical surface, and the side surface portion 32. The inner side of is the side that is displaced in the left-right direction depending on the vertical position, and the wall thickness is gradually reduced from both upper and lower ends to the central portion. The outer wall surface 32c of the side surface portion 32 becomes a part of the outer wall surface 21b of the contact side tubular portion 21.

  In the present embodiment, with respect to the thickness of the side surface portion 32, the minimum thickness dimension D3 at the upper and lower central portions is approximately half the maximum thickness dimension D2 at the upper and lower end portions (see FIG. 7).

  In the contact-side tubular portion 21 as described above, the upper cavity 20a has a horizontal lower surface 31b, left and right inner wall surfaces 32d that are curved surfaces that are convex outward in the width direction and have an arcuate cross section, and downward. The upper surface 33a is a convex curved surface having an arcuate cross section, and has a substantially barrel shape in a cross sectional view of the seal rubber 10.

  Next, the intermediate space forming unit 23 will be described in detail. The intermediate space forming portion 23 is formed as a wide portion with respect to the contact side tubular portion 21. Therefore, in the seal rubber 10, the dimension E1 in the width direction of the intermediate space forming portion 23 is larger than the dimension E2 in the width direction of the contact side tubular portion 21. Here, the dimension E1 in the width direction of the intermediate space forming portion 23 is the maximum dimension in the width direction in the intermediate space forming portion 23, and is a vertical outer wall surface that is the outer wall surface of the left and right side wall portions 26 in the width direction. It is a dimension between 26b. Similarly, the dimension E2 in the width direction of the contact side tubular portion 21 is the maximum width dimension in the contact side tubular portion 21, and is the dimension between the outer wall surfaces 32c of the left and right side surface portions 32 in the width direction.

  Further, in the intermediate space forming portion 23, a slanted wall surface 26c is formed above the outer wall surface 26b. That is, the side wall portion 26 has, on the outer side in the width direction, a vertical outer wall surface 26b and an inclined wall surface 26c formed on the upper side wall surface 26b. The inclined wall surface 26c is a surface portion that is connected downward with respect to the outer wall surface 21b of the contact-side tubular portion 21, and is an inclined surface that is gradually inclined outward in the width direction from the upper side to the lower side.

  Therefore, in the seal rubber 10, from the upper side to the lower side, the width from the portion of the contact side tubular portion 21 having the dimension E2 in the width direction to the widths of the left and right slanted wall surfaces 26c forming shoulder portions that gradually increase the dimension in the width direction. It reaches a portion of the intermediate space forming portion 23 having a dimension E1 in the direction. The outer wall surface 26b and the inclined wall surface 26c of the left and right side wall portions 26 form an intermediate portion in the up-down direction of the width direction outer wall surface of the seal rubber 10. Further, the outer wall surface 26b is located on a virtual vertical plane common to the side surface 24b of the sandwiching piece portion 24, and the concave groove 25 is formed between the outer wall surface 26b and the side surface 24b. The upper side surface 25c of the concave groove 25 is a surface that forms a substantially right angle with the outer wall surface 26b of the side wall portion 26.

  In addition, in the intermediate space forming portion 23, the side wall portion 26 has a thin portion 26d at a portion in the vertical direction, the thin portion 26d having a smaller thickness than other portions. In the present embodiment, the side wall portion 26 has a thin-walled portion 26d at its central portion in the vertical direction.

  More specifically, the side wall portion 26 has an inner wall surface 26a that is a curved surface that includes upper and lower slope portions (26e, 26f) that are substantially symmetrical with respect to the vertical direction and that has an outer side in the width direction in the vertical direction as a convex side. By doing so, the central part in the up-down direction is made the thinnest part. That is, in the left and right side wall portions 26, the inner wall surface 26a is a curved surface with the outer side in the width direction being the convex side in the cross section of the seal rubber 10 with respect to the outer side wall surface 26b that is the vertical plane, and The inner side is the side that is displaced in the left-right direction depending on the vertical position, and the wall thickness is gradually reduced from the upper and lower ends to the central portion.

  The inner wall surface 26a of the left and right side wall portions 26 has an upper slope portion 26e which is an upper portion of the inner wall surface 26a, a lower slope portion 26f which is a lower portion of the inner wall surface 26a, and an upper slope portion 26e and a lower slope portion 26f. And a curved surface portion 26g forming a central portion of the side wall portion 26. The upper slope portion 26e is inclined from the upper side to the lower side so as to gradually increase the surface dimension of the left and right inner wall surfaces 26a. The lower slope portion 26f is inclined from the upper side to the lower side so as to gradually reduce the interplanar dimension of the left and right inner wall surfaces 26a. The curved surface portion 26g is a surface portion that smoothly connects the upper sloped portion 26e and the lower sloped portion 26f, and is curved so as to form an arc shape with the outer side in the width direction as the convex side in the cross-sectional view of the seal rubber 10. The inner wall surface 26a has a shape that is substantially vertically symmetrical about the center position of the curved surface portion 26g in the vertical direction. Further, the upper slope portion 26e is a surface substantially parallel to the slope wall surface 26c formed on the upper side of the outer wall surface 26b as described above.

  In this embodiment, with respect to the thickness of the side wall portion 26, the minimum thickness dimension F1 at the upper and lower central portions is approximately 2/5 of the maximum dimension F2 in the width direction (see FIG. 7).

  Further, the pair of left and right side wall portions 26 that form the intermediate space forming portion 23 are portions that are continuous with the sandwiching piece portion 24 that forms the sandwiching portion 22, and are located below the contacting side tubular portion 21 together with the sandwiching piece portion 24. The extended leg portion 27 is formed. That is, in the cross-sectional view of the seal rubber 10, a portion below the contact-side tubular portion 21 is bifurcated into a claw shape, and each branched portion is a leg portion 27. The seal rubber 10 sandwiches the upper ends of the partition wall edge portions 11c between the lower end portions of the left and right leg portions 27, so that the contact side tubular portion 21 and the partition wall edge portion are provided between the upper portions of the left and right leg portions 27. The lower cavity 20b is formed together with the portion 11c.

  Specifically, the leg portion 27 has a portion extending downwardly from both left and right sides of the lower end portion of the contact side tubular portion 21 as an upper portion of the side wall portion 26 of the intermediate space forming portion 23, and The sandwiching piece portion 24 of the sandwiching portion 22 continuous to the lower portion and the lower side thereof is provided as a lower portion and extends downward.

  The seal rubber 10 having the above configuration is used as a member for sealing between the skin mold 2 and the reservoir tank 3 in the slush molding sealing method according to the present embodiment as follows. That is, with the partition wall edge portion 11c of the reservoir tank 3 facing the partitioning portion of the movement space 8 of the powder material 4 in the skin type 2 being sandwiched between the lower portions of the pair of legs 27, the seal rubber 10 is applied to the reservoir tank 3. And the lower cavity 20b along the longitudinal direction of the seal rubber 10 is formed by the portion of the contact side tubular portion 21 on the leg portion 27 side (partition wall portion 33), the upper portions of the pair of leg portions 27, and the partition wall edge portion 11c. To do.

  According to the slush molding apparatus 1, the seal rubber 10, and the slush molding sealing method using the seal rubber 10 according to the present embodiment as described above, the following actions and effects can be obtained. That is, in the slush molding, the seal rubber 10 provided between the skin mold 2 and the reservoir tank 3 is sufficiently bent to follow the change in the gap between the skin mold 2 and the reservoir tank 3 due to the deformation of the skin mold 2. The amount can be obtained, the leakage of the powder material 4 to the outside can be prevented, and the quality of the molded product and the yield can be improved.

  FIG. 8 shows an example of a conventional seal rubber 110 as a comparative example with respect to the seal rubber 10 according to the present embodiment. As shown in FIG. 8, the seal rubber 110 has a cavity 111 in the upper half portion and a groove portion 112 into which the partition wall edge portion 11c is fitted in the lower half portion, and has a substantially “A” -shaped cross-sectional shape. Have.

  According to such a seal rubber 110, the deformation amount of the deformation in the escape direction with respect to the reservoir tank 3 due to the heating / cooling of the skin type 2 may be larger than the deflection amount of the seal rubber 110. That is, according to the seal rubber 110, it may not be possible to obtain a sufficient amount of flexure in order to follow the deformation of the skin mold 2 as a permanent strain. In this case, a gap 120 is generated between the seal rubber 110 and the molding surface 2a of the skin mold 2. When the gap 120 is generated, the powder material that originally moves inside the seal portion formed by the seal rubber 110, that is, moves in the space on the molding surface portion 2b side and adheres to / melts on the molding surface portion 2b is rotated when the mold / tank combination structure is rotated. Then, a phenomenon occurs that the gas leaks to the outside from the gap 120 (see arrow H1). Leakage of the powder material leads to poor quality of the molded product and lower yield.

  Therefore, according to the seal rubber 10 according to the present embodiment, upper and lower two-stage space portions of the upper cavity 20a of the contact side tubular portion 21 and the lower cavity 20b formed by the intermediate space forming portion 23 are formed, and the seal rubber is formed. Regarding the bending deformation of 10, it is possible to obtain the bending deformation of two stages in which the upper and lower space portions are crushed. As a result, for example, in comparison with a configuration in which the vertical dimension of the seal rubber 110 is simply increased in order to increase the amount of flexure (a configuration in which the cavity 111 is vertically long), the lateral cross-sectional shape of the portion that undergoes flexural deformation is in the vertical direction. Even if the shape is vertically long, the bending deformation of the upper and lower parts, that is, the buckling deformation of the side walls forming each space, etc., is not biased in the width direction or bent overall. It is possible to increase the vertical deformation amount (deflection amount) while obtaining stable deformation.

  Therefore, even with a relatively large mold such as the skin mold 2 for forming the skin material 15 of the instrument panel, the seal rubber 10 follows the deformation of the skin mold 2 as a permanent strain due to heating and cooling. It is possible to obtain good sealing properties. As a result, the powder material 4 can be prevented from leaking outside from the molding surface portion 2b of the skin mold 2, and the quality of the skin material 15 and the yield can be improved.

  Specifically, in the seal portion 7 according to the present embodiment, as shown in FIG. 5, in the vertical direction, from the upper surface 31a of the top surface portion 31 of the seal rubber 10 to the upper surface of the mounting member 16 located in the concave groove 25. The region G1 up to the contact position of the portion 16z with respect to the seal rubber 10 (the height position of the upper surface of the mounting member 16) is the bending region of the seal rubber 10. That is, the portion of the flexible region of the seal rubber 10 becomes a portion that is deformed by pressure when the seal rubber 10 receives a load in a direction of vertically compressing when the skin mold 2 and the reservoir tank 3 are combined. 10 follows the deformation of the skin type 2, and the sealing property is maintained.

  An example of the modification of the seal rubber 10 will be described with reference to FIG. The modification of the seal rubber 10 shown here is an example in which the surface of the molding surface 2a of the skin mold 2 in contact with the upper surface 31a of the seal rubber 10 is a horizontal surface, and the direction of the load acting on the seal rubber 10 is the vertical direction. is there.

  When a load is applied to the seal rubber 10, first, as shown in FIG. 9A, the flexural deformation is started mainly from the second layer portion in the upper and lower two-layer structure, that is, the intermediate space forming portion 23. This is because the thickness of the left and right side surface portions 32 in the first layer portion, that is, the contact side tubular portion 21 is relatively large. In the flexural deformation of the intermediate space forming portion 23, the left and right side wall portions 26 are respectively deformed so as to bend outward in the width direction.

  Subsequently, as shown in FIG. 9B, after the bending deformation of the second layer is almost completed, the bending deformation of the first layer starts. That is, the left and right side surface portions 32 forming the contact side tubular portion 21 start to deform so as to bulge outward in the width direction. Further, the partition 33 is deformed so as to bulge downward. This means that the partition 33 has a horizontal lower surface 31b and a lower convex upper surface 31a (see FIG. 7), and has a shape in which the middle portion in the left-right direction is a thin portion. to cause.

  Then, as shown in FIG. 9 (c), finally, both the first layer and the second layer are flexibly deformed, and the seal rubber 10 is entirely compressed in the up-down direction to be in a lazy state. In this state, the left and right side wall portions 26 of the intermediate space forming portion 23 are bent outward in the width direction so that the upper half portion and the lower half portion are close to each other. Further, the partition wall portion 33 is curved with the lower side being convex, and the widthwise central portion of the lower surface 31b is brought close to the upper end surface 11f of the partition wall edge portion 11c. Further, the left and right side surface portions 32 of the contact side tubular portion 21 are bent outward in the width direction, and the lower portions of the inner wall surface 32d are brought close to each other.

  Then, as shown in FIG. 9C, in the state where the bending deformation of the seal rubber 10 is completed, the vertical movement amount J1 of the upper surface 31a from the natural state of the seal rubber 10 indicated by the chain double-dashed line is Is the amount of deflection.

  As described above, according to the seal rubber 10 according to the present embodiment, the stepwise (two-step) flexural deformation due to the flexural deformation of the second layer and the flexural deformation of the first layer can be obtained. One of the structural factors that causes such a stepwise bending deformation is that the thickness of the side surface portion 32 of the contact side tubular portion 21 (the thickness of the central portion in the vertical direction, see FIG. 7, dimension D3) is the first And the thickness of the partition wall portion 33 serving as the connecting portion of the second layer (thickness at the widthwise central portion, see FIG. 7, dimension D4). As specific dimensions, for example, the thickness dimension D3 of the side surface portion 32 is 1.8 mm, and the thickness dimension D4 of the central portion in the width direction of the partition wall portion 33 is 1.5 mm.

  The respective constituents of the seal rubber 10 according to the present embodiment and the functions and effects thereof are as follows.

  In the seal rubber 10 according to the present embodiment, the contact-side tubular portion 21 includes the top surface portion 31, the left and right side surface portions 32, and the partition wall portion 33, and the top surface 31a of the top surface portion 31 that is the contact surface for the skin mold 2 is a flat surface. The outer wall surface 21b of the contact-side tubular portion 21 is formed in a rectangular shape to form a corner 21d, and the upper end portion is angular. According to such a configuration, the yield can be stabilized in comparison with a configuration in which the contact surface with respect to the skin mold 2 is a curved surface having a convex contact side, such as the seal rubber 110 shown in FIG. As a result, the yield can be improved.

  Specifically, as shown in FIG. 10A, in the case of a seal rubber having a curved surface 131a having a convex contact side as a contact surface for the skin mold 2, the contact area for the skin mold 2 is small. Further, due to the curved shape of the curved surface 131a, the curved surface 131a gradually opens from the contact position of the seal rubber to the inner side (molding surface portion 2b side) with respect to the molding surface portion 2b, and at the boundary portion of the sealing position by the sealing rubber, in a cross-sectional view. A substantially triangular space 140 is formed (see the hatched portion). From these facts, in the case of the seal rubber having the curved surface 131a, the seal position and the characteristics of the seal rubber vary depending on the contact position with respect to the skin mold 2, the amount of bending of the seal rubber, etc., and the reachable range of the powder material 4 becomes unstable. As a result, the yield becomes unstable. The instability of the yield leads to a decrease in the yield because it is necessary to consider the variation in the sealing position due to the seal rubber.

  On the other hand, as shown in FIG. 10B, according to the seal rubber 10 according to the present embodiment, the upper surface 31 a forming the angular upper end portion of the seal rubber 10 comes into full contact with the skin mold 2. A sufficient contact area can be secured, and the space 140 as shown in FIG. 10A is not formed at the boundary portion of the seal position of the seal rubber 10. Therefore, the seal position can be stabilized irrespective of the contact position of the seal rubber 10 with respect to the skin mold 2, the amount of bending, etc., so that the reachable range of the powder material 4 is stabilized, and as a result, the yield can be stabilized. Therefore, the yield can be improved.

  Further, in the seal rubber 10 according to the present embodiment, the top surface portion 31 is formed to be thicker than the side surface portion 32. In particular, in the present embodiment, the top surface portion 31 is formed as a portion having a larger wall thickness than the other portions of the contact side tubular portion 21 including the partition wall portion 33. With such a configuration, the heat transferred from the skin mold 2 to the seal rubber 10 can be absorbed by the portion of the top surface portion 31, so that the heat conduction to the portion below the top surface portion 31 is suppressed. be able to. This makes it possible to suppress deterioration of the seal rubber 10 due to heat. As a result, the number of times of replacement and maintenance of the seal rubber 10 can be reduced, and productivity can be improved.

  Further, by making the top surface portion 31 relatively thick, it is possible to easily secure rigidity in the top surface portion 31, which is a contact portion with the skin mold 2, and to bend the seal rubber 10 while maintaining the shape of the top surface portion 31. The deformation can be a bilaterally symmetric and stable bending deformation. As a result, the load acting on the seal rubber 10 is stabilized, and good sealability can be obtained. In particular, from the viewpoint of obtaining stable flexural deformation in the seal rubber 10, it is preferable that the lower surface 31b of the top surface portion 31 is also a horizontal surface like the upper surface 31a.

  Further, in the seal rubber 10 according to the present embodiment, the side surface portion 32 that constitutes the contact side tubular portion 21 has the thin portion 32b in a part in the vertical direction. With such a configuration, the side surface portion 32 can be intentionally buckled from the thin portion 32b as a starting point, so that the seal rubber 10 is flexibly deformed depending on the portion where the thin portion 32b is provided, the thickness of the thin portion 32b, and the like. It is possible to control the aspect of the above, and it is possible to obtain a stable flexural deformation of the seal rubber 10.

  In particular, in the present embodiment, the side surface portion 32 has the outer wall surface 32c that is vertical and the inner wall surface 32d that is a curved surface that is convex outward in the width direction. It has a shape that reduces the wall thickness. With such a configuration, when the seal rubber 10 is flexibly deformed, the left and right side surfaces 32 can be reliably bent (buckled) outward in the width direction, so that the first-layer portion of the seal rubber 10 is flexed. The amount of deformation can be effectively increased, and stable flexural deformation can be obtained.

  That is, in the bending deformation of the seal rubber 10, if the left and right side surface portions 32 are bent inward, the left and right side surface portions 32 interfere with each other, so that the bending deformation amount in the contact side tubular portion 21 is insufficient. It is conceivable that the bending deformation may be biased to the left or right. In this respect, since the left and right side surface portions 32 are deformed so as to bend outward, the left and right side surface portions 32 do not interfere with each other, so that the upper cavity 20a can be effectively used in the bending deformation of the seal rubber 10. As a result, the amount of bending can be effectively increased, and the bending deformation is not biased in the left-right direction, so that stable bending deformation can be obtained. As a result, the sealing position of the seal rubber 10 can be stabilized, so that the yield can be stabilized as described above.

  Further, the configuration in which the side surface portion 32 has the thin wall portions 32b at the upper and lower central portions thereof makes it easy to bend and deform the side surface portion 32 even in terms of a geometrical surface, and contributes to an increase in the amount of bending of the seal rubber 10. The shape in which a part of the side surface portion 32 is a thin wall portion is not limited to the present embodiment. For example, the outer wall surface 32c has a curved surface with the inner side in the width direction as the convex side, and the outer side of the side surface portion 32 is vertically moved. As a side that is displaced in the left-right direction depending on the position in the direction, the wall thickness may be gradually reduced from the upper and lower ends to the central portion.

  Further, in the seal rubber 10 according to the present embodiment, the dimension of the intermediate space forming portion 23 in the width direction (see FIG. 7, dimension E1) is larger than the dimension of the contact side tubular portion 21 in the width direction (FIG. 7, dimension E2). Is also configured to be large. According to such a configuration, when the seal rubber 10 is flexibly deformed, the load transmitting portion acting on the seal rubber 10 can be widened to the left and right in the lower portion of the seal rubber 10, so that the load in the seal rubber 10 is stable. However, it is possible to effectively cause the above-described stepwise bending deformation.

  Further, in the seal rubber 10 according to the present embodiment, the side wall portion 26 forming the intermediate space forming portion 23 has a thin portion 26d in a part in the vertical direction. With such a configuration, the side wall portion 26 can be intentionally buckled from the thin portion 26d as a starting point, so that the seal rubber 10 is flexibly deformed depending on the portion where the thin portion 26d is provided and the thickness of the thin portion 26d. It is possible to control the aspect of the above, and it is possible to obtain a stable flexural deformation of the seal rubber 10.

  In particular, in this embodiment, the side wall portion 26 has a curved surface whose inner wall surface 26a has a substantially "V" -shaped cross-sectional shape including the upper and lower upper slope portions 26e and having the convex side on the outer side in the width direction. As a result, the central portion in the vertical direction is the thinnest portion. According to such a configuration, when the seal rubber 10 is flexibly deformed, it is possible to reliably bend (buckle) the left and right side wall portions 26 outward in the width direction. Therefore, regarding the second layer portion of the seal rubber 10, The amount of flexural deformation can be effectively increased, and stable flexural deformation can be obtained.

  That is, in the bending deformation of the seal rubber 10, if the left and right side wall portions 26 are bent inward, the left and right side wall portions 26 interfere with each other, and the amount of bending deformation in the intermediate space forming portion 23 is insufficient. It is conceivable that the bending deformation is biased to the left or right. In this regard, since the left and right side wall portions 26 are deformed so as to bend outward, the left and right side wall portions 26 do not interfere with each other, so that the lower cavity 20b can be effectively used in the bending deformation of the seal rubber 10. As a result, the amount of bending can be effectively increased, and the bending deformation is not biased in the left-right direction, so that stable bending deformation can be obtained. As a result, the sealing position of the seal rubber 10 can be stabilized, so that the yield can be stabilized as described above.

  Further, the configuration in which the side wall portion 26 has the thin wall portions 26d at the upper and lower central portions thereof makes it easier to bend and deform the side wall portion 26 even in terms of a shape surface, and contributes to an increase in the amount of bending of the seal rubber 10. The shape in which a part of the side wall portion 26 is a thin wall portion is not limited to the present embodiment. For example, the outer side wall surface 26b is a curved surface whose inner side in the width direction is a convex side, and the outer side of the side wall portion 26 is in the vertical direction. As a side that is displaced in the left-right direction depending on the position, the wall thickness may be gradually reduced from the upper and lower ends to the central portion.

  Further, in the seal rubber 10 according to the present embodiment, as shown in FIG. 5, the root portion of the side wall portion 26 with respect to the contact-side tubular portion 21, that is, the central portion of the root portion on the upper side of the leg portion 27, in a cross-sectional view. Most of the side wall portion 26 is located on the outer side in the width direction of the straight line L1 that connects the point P1 located at the point P1 and the point P2 that is the position of the upper end of the contact portion of the mounting member 16 with respect to the seal rubber 10. Also in such a structure, the point P1 serves as a force point and the point P2 serves as a fulcrum in the flexural deformation of the seal rubber 10, and it is possible to bend (buckle) the left and right side wall portions 26 outward in the width direction to obtain a stable flexural deformation. Will be a factor.

  Further, in the slush molding sealing method according to the present embodiment, the seal rubber 10 is attached to the reservoir tank 3 with the partition wall edge 11c sandwiched between the lower portions of the pair of left and right legs 27 of the seal rubber 10, and the upper cavity is closed. A lower cavity 20b is formed below the wall 20a with a partition 33 therebetween. According to such a sealing method, the upper and lower two-stage cavities can be formed in the seal portion 7, and the stepwise (two-step) flexural deformation as described above can be obtained. Thereby, as described above, it is possible to obtain a sufficient amount of bending to follow the change in the gap between the skin type 2 and the reservoir tank 3, and it is possible to prevent the powder material 4 from leaking to the outside. It is possible to improve the quality of the molded product and the yield.

  Further, the seal rubber 10 according to the present embodiment can be used such that only the first layer portion, that is, the contact-side tubular portion 21 is the bending region, as shown in FIG. 11A. In the example shown in FIG. 11A, the seal rubber 10 has the partition wall edge portion 11c inserted from the lower side so that the upper end surface 11f of the partition wall edge portion 11c contacts or approaches the lower surface 33b of the partition wall portion 33. In this state, it is fixed to the partition wall edge portion 11c via the mounting bracket 16.

  In such a mounting mode of the seal rubber 10, the upper end portion of the partition wall edge portion 11c enters the lower cavity 20b. When the upper end surface 11f of the partition wall edge portion 11c is in contact with the lower surface 33b of the partition wall portion 33, the partition wall edge portion 11c fills the left and right middle portion of the lower cavity 20b, and the lower cavity 20b is divided into left and right. Become. Then, in the vertical direction, a region G2 from the upper surface 31a of the top surface portion 31 of the seal rubber 10 to the lower surface 33b of the partition wall portion 33 where the upper end surface 11f of the partition wall edge portion 11c is in contact with or close to is the region G2 of the seal rubber 10 in this mounting mode. It becomes a bending area.

  The deformation mode of the seal rubber 10 in such a mounting mode of the seal rubber 10 is as follows. In addition, the direction of the load acting on the seal rubber 10 is the vertical direction, as in the case of the above-described modification of the seal rubber 10.

  As shown in FIG. 11B, when the load is applied to the seal rubber 10, the left and right side surface portions 32 forming the contact side tubular portion 21 respectively start to deform so as to bulge outward in the width direction. . Here, the downward bulging deformation of the partition wall portion 33 is restricted by the partition wall edge portion 11c located immediately below the partition wall portion 33. Eventually, only the first layer portion is flexibly deformed, and only the first layer portion is compressed in the up-down direction to be in a state of being in a ladle. The left and right side surfaces 32 of the contact-side tubular portion 21 are bent outward in the width direction, and the lower portions of the inner wall surface 32d are brought close to each other.

  Then, as shown in FIG. 11B, in the state where the bending deformation of the seal rubber 10 is completed, the vertical movement amount J2 of the upper surface 31a from the natural state of the seal rubber 10 indicated by the chain double-dashed line is It is the amount of bending in the mounting mode. The amount of flexure of the seal rubber 10 is about half the size of the mounting manner of the seal rubber 10 as shown in FIG.

  As described above, according to the seal rubber 10 according to the present embodiment, the amount of bending of the seal rubber 10 can be adjusted depending on the manner of attachment to the partition wall edge portion 11c. In the mounting mode of the seal rubber 10 as shown in FIG. 11A, for example, thermal deformation of the skin type 2 is relatively small, and changes in the gap between the skin type 2 and the reservoir tank 3 due to the deformation of the skin type 2 are followed. It is used when the range to do is relatively narrow. According to this mounting mode, it is possible to maintain the sealing property by following the deformation of the skin mold 2 while obtaining a stable bending deformation of only the first layer of the seal rubber 10.

  Next, a modified example of the seal rubber 10 according to the present embodiment will be described with reference to FIGS. 12, 13 and 14. The seal rubber 10 of this modified example has a structure intended to further improve the yield.

  As shown in FIG. 12, in the seal rubber 10 of this modification, at least a part of the leg portion 27 is formed in a part of the seal rubber 10 in the longitudinal direction (extending direction) in order to bend or curve the seal rubber 10 in the longitudinal direction. It has a notch portion 50 which is notched.

  In the example shown in FIG. 12, the notch 50 has a leg portion in the up-down direction with the lower side as an open side so as to follow a substantially isosceles triangle shape in which the lower side of the seal rubber 10 is the base side in each leg portion 27. It is formed in the range including the whole 27. In detail, the cutout portion 50 has oblique side portions 51 on both sides in the longitudinal direction of the seal rubber 10 and an upper side portion 52 which is a side portion between both oblique side portions 51 and extends along the longitudinal direction of the seal rubber 10. Further, in the left and right leg portions 27, the cutout portions 50 are formed so as to be aligned with each other in a side view of the seal rubber 10, that is, have the same size at a common position.

  The reservoir tank 3 has a three-dimensional uneven shape with respect to the partition wall edge portion 11c so as to follow the three-dimensional uneven shape of the skin type 2. A shape portion (small radius R) in the partition wall edge portion 11c is smaller as the shape of the partition wall edge portion 11c is made to conform to the shape of the molding surface portion 2b in the skin mold 2, that is, the product shape. Part) occurs. That is, as the partition wall edge portion 11c is made to approach the fine uneven shape of the molding surface portion 2b corresponding to the shape of the skin material 15, the curvature of the R portion in the partition wall edge portion 11c is made to follow the molding surface portion 2b. It is necessary to reduce the radius.

  Therefore, the notch 50 is used to bend the seal rubber 10 corresponding to the small R portion of the partition edge portion 11c. That is, in the sealing method of this modified example, when the seal rubber 10 is attached to the partition wall edge portion 11c, the notch 50 is formed in a part of the seal rubber 10 in the longitudinal direction, so that the partition wall in the longitudinal direction of the seal rubber 10 is formed. The seal rubber 10 is bent in the longitudinal direction so as to follow the small R portion of the edge portion 11c. Therefore, the cutout portions 50 are formed at one or a plurality of locations in the longitudinal direction of the seal rubber 10 so as to correspond to the small R-shaped portions of the partition wall edge portions 11c.

  Specifically, for example, FIG. 13A shows a mounting mode of the seal rubber 10 in the case where a substantially right-angled R-shaped portion 61 exists as an uneven shape in the vertical direction in the partition wall edge portion 11c. In this case, in the longitudinal direction of the seal rubber 10, the notch 50 faces the R-shaped portion 61, and the portions 10a, 10a on both sides of the notch 50 are arranged along the side portions 61a, 61a forming the R-shaped portion 61. The seal rubber 10 is attached to the partition wall edge portion 11c in a bent state.

  In the mounting mode of the seal rubber 10 shown in FIG. 13 (a), the notch 50 is located inside (the inner peripheral side) of the bent shape of the seal rubber 10, and allows bending with the upper side of the seal rubber 10 as the convex side. There is. That is, the cutout portion 50 eliminates looseness of the rubber surface portion on the inner side of the bending when the seal rubber 10 is bent at a right angle, and the seal rubber 10 with respect to the corner portion of the partition wall edge portion 11c including the R-shaped portion 61 is It is attached with the cross-sectional shape being kept constant.

  In the attached state of the seal rubber 10 shown in FIG. 13A, the notch 50 is in a state of being compressed and deformed by bending the seal rubber 10 so that the oblique sides 51 on both sides come close to each other. As shown in FIG. 13A, when a gap 62 is formed between the R-shaped portion 61 and the seal rubber 10 due to the notch 50, the gap 62 is filled with a filler such as silicone rubber to fill the hole. Then, the sealing property of the seal rubber 10 is secured.

  Further, FIG. 13B shows a mounting mode of the seal rubber 10 in the case where a substantially right-angled concave R-shaped portion 63 exists in the partition wall edge portion 11c as an uneven shape in the vertical direction. In this case, in the longitudinal direction of the seal rubber 10, the cutout 50 faces the R-shaped portion 63, and the portions 10a, 10a on both sides of the cutout 50 are along the side portions 63a, 63a forming the R-shaped portion 63. The seal rubber 10 is attached to the partition wall edge portion 11c in a bent state.

  In the mounting mode of the seal rubber 10 shown in FIG. 13B, the cutout portion 50 is located outside (in the outer peripheral side) of the bent shape of the seal rubber 10, and allows the bending with the upper side of the seal rubber 10 as the concave side. . In other words, the notch 50 eliminates the tension of the rubber surface portion on the outer side of the bend when the seal rubber 10 is bent at a right angle, and the seal rubber 10 is removed from the concave corner portion of the partition wall edge portion 11c including the R-shaped portion 63. , The cross-sectional shape of which is held in a fixed shape.

  In the attached state of the seal rubber 10 shown in FIG. 13B, the notch 50 is in a state of being stretched and deformed by separating the oblique sides 51 on both sides by the bending of the seal rubber 10. As shown in FIG. 13B, when a gap 64 is formed between the R-shaped portion 63 and the seal rubber 10 due to the cutout 50, the hole is filled with a filler such as silicone rubber as in the case described above. .

  In addition, FIG. 13C shows an attachment mode of the seal rubber 10 in the case where a substantially right-angled R-shaped portion 65 exists as an uneven shape (in plan view) in the horizontal direction at the partition wall edge portion 11c. . In this case, in the longitudinal direction of the seal rubber 10, the notch 50 is located at the portion of the R-shaped portion 65, and the portions 10a, 10a on both sides of the notch 50 are along the side portions 65a, 65a forming the R-shaped portion 65. As described above, the seal rubber 10 is attached to the partition wall edge portion 11c in a bent state.

  In the mounting mode of the seal rubber 10 shown in FIG. 13C, the cutout portions 50 are located inside (inner peripheral side) and outside (outer peripheral side) of the bent shape of the seal rubber 10, and the lateral direction of the seal rubber 10 in a plan view. Allows bending. In other words, the cutout portion 50 eliminates looseness of the rubber surface portion on the inside of the bending and tension of the rubber surface portion on the outside of the bending when the seal rubber 10 is bent at a right angle in plan view, and the partition wall edge including the R-shaped portion 65 is eliminated. The seal rubber 10 is attached to the corner portion of the portion 11c in a state in which the cross-sectional shape thereof is kept constant.

  In the attached state of the seal rubber 10 shown in FIG. 13 (c), the inner cutout portion 50A of the cutout portion 50 is in a state in which the oblique sides 51 on both sides are brought closer to each other by compression due to the bending of the seal rubber 10. The outer notch 50B is in a state of being stretched and deformed by separating the oblique sides 51 on both sides by bending the seal rubber 10. Note that, also in the case shown in FIG. 13C, the gap formed between the R-shaped portion 65 and the seal rubber 10 by the cutout portion 50 is filled with a filler such as silicone rubber.

  As described above, by providing the cutout portion 50 in the seal rubber 10, it is possible to deal with the small R portion of the partition wall edge portion 11c as the attachment site of the seal rubber 10. Thereby, the yield in slush molding can be improved.

  That is, in order to properly attach the seal rubber 10 to the portion which becomes the small R portion when the uneven shape of the partition wall edge portion 11c is brought close to the product shape, without causing the rubber surface portion to be loosened or pulled. The shape of the partition edge portion 11c itself has a large radius of curvature R so as to include the small R portion. That is, by arranging the disposition route of the partition wall edge portion 11c, in other words, bypassing the seal line by the seal rubber 10, the region inside the seal line (molding surface portion 2b side) includes a region that becomes the small R portion, It is enlarged so that the radius R becomes large.

  By bypassing the seal line formed by the seal portion 7 in this manner, the seal position of the seal portion 7 (position of the partition wall edge portion 11c) is separated from the end position (outer shape position) of the product shape to the outside. The area where the powder material 4 adheres and melts (powder melting area) expands at the outer peripheral edge portion by the amount that the sealing position by the sealing portion 7 is separated from the end position of the product shape. On the other hand, in a molded product obtained by slush molding, a portion outside a predetermined cutting line along the outer shape of the product shape is a portion to be cut in a later trimming step. Therefore, the spread of the powder melting region at the outer peripheral edge portion as described above increases the area of the portion of the molded product that is cut off by the trimming process, and as a result, the yield is reduced.

  Therefore, by providing the cutout portion 50 in the seal rubber 10 as described above, it becomes possible to reduce the size of the radius of curvature R that can be applied to the shape of the partition wall edge portion 11c to which the seal rubber 10 is attached. As a result, the seal line (arrangement path) of the seal rubber 10 can be made to follow the product shape, and as close as possible to the end position of the product shape. Therefore, it is possible to reduce the area of the extra portion of the molded product that is cut off by the trimming process, and as a result, the yield can be improved. As a result, the cost of the molded product can be reduced.

  As a specific numerical value, the radius of curvature that can be accommodated when the notch 50 is not provided in the seal rubber 10 is the uneven shape in the vertical direction of the partition wall edge portion 11c as shown in FIGS. Hereinafter, the radius of curvature R in "surface irregularities" is R> 50 (mm), and the shape of the partition wall edge portion 11c in plan view as shown in FIG. 13C (hereinafter referred to as "line inflection"). ), The radius of curvature R is R> 80 (mm). On the other hand, by providing the notch 50 in the seal rubber 10, the radius of curvature R that can be accommodated is R> 10 (mm) for surface irregularities and R> 4 (mm) for line inflection.

  As described above, the shape and size of the cutout portion 50 (the range in which the cutout portion 50 is formed) for disposing the seal rubber 10 corresponding to the small R portion are not particularly limited, and the partition wall edge portion 11c is not limited thereto. It can be appropriately changed according to the shape of the portion forming the small R portion. Specifically, the cutout portion 50 may be, for example, a cutout portion 50X formed along a quadrangular shape as shown in FIG. 14A, or as shown in FIG. 14B. As described above, the cutout portion 50Y and the like formed along the semicircular shape (semicircular arc shape) may be used.

  The rectangular notch portion 50X shown in FIG. 14A has an open side on the lower side, and is a vertical side portion 53 on both sides in the longitudinal direction of the seal rubber 10 and a side portion between the vertical side portions 53, which is the side of the seal rubber 10. And a lateral side portion 54 along the longitudinal direction. In addition, the semicircular cutout portion 50Y shown in FIG. 14B has an open side on the lower side and a semicircular arcuate side portion 55. These notches 50X and 50Y are both formed in the left and right leg portions 27 so as to be aligned in a side view of the seal rubber 10.

  The cutouts 50 according to the present embodiment are formed on both the left and right legs 27, but depending on the shape of the partition wall edge portion 11c corresponding to the cutouts 50, the left and right legs 27 may be formed. The notch 50 may be formed in only one of the above. That is, in the cutout portion 50, at least one of the left and right leg portions 27 may be formed in the one leg portion 27. Further, the cutout portion 50 according to the present embodiment is formed in a range that extends from the lower end of the seal rubber 10 to a part of the partition wall portion 33 in the vertical direction, but may be formed only in the leg portion 27. It may be formed in a range reaching the side surface portion 32 of the contact side tubular portion 21. That is, the cutout 50 may be formed by cutting out at least a part of the leg 27.

  Further, in the seal rubber 10 according to the present embodiment, since the top surface portion 31 is formed as a portion having a relatively large wall thickness, when the cutout portion 50 is provided, for example, as in the seal rubber 110 shown in FIG. As compared with the configuration having the curved upper end portion, the rigidity of the portion where the cutout portion 50 is formed can be easily ensured. That is, by forming the top surface portion 31 as a portion having a relatively large wall thickness, it becomes easy to secure the rigidity of the seal rubber 10, and thus a high degree of freedom regarding the shape and size of the cutout portion 50 can be obtained. Processing of the seal rubber 10 for forming the cutout portion 50 becomes easy.

  The technique relating to the slush-molding seal according to the present invention, which has been described with respect to the embodiment as described above, is not limited to the above-described embodiment, and various aspects can be adopted within the scope of the gist of the present invention.

  Hereinafter, examples of the present invention will be described. In this example, the following dimensions were adopted for the dimensions of each part of the seal rubber 10 according to the above-described embodiment. That is, the dimension of the bending region (see FIG. 5, region G1) is 20 mm, the thickness dimension of the central portion in the width direction of the partition 33 (see FIG. 7, dimension D4) is 1.48 mm, and the vertical direction of the side surface portion 32. The thickness dimension of the central portion (see FIG. 7, dimension D3) was 1.8 mm, and the thickness dimension of the top surface portion 31 (see FIG. 7, dimension D1) was 4 mm. The overlap dimension (see FIG. 7, dimension K1) between the seal rubber 10 and the partition wall edge portion 11c was set to 6 mm. In this embodiment, this overlap dimension corresponds to the dimension from the lower end surface 24a of the sandwiching piece portion 24 to the lower end of the inner wall surface 26a of the side wall portion 26 in the vertical direction. Further, the rubber hardness of the seal rubber 10 was 40 degrees, and the length of the seal rubber 10 was 50 mm.

  A load was applied to the seal rubber 10 according to this example having such dimensions so as to be compressed in the vertical direction. In the present embodiment, as in the case of the modification of the seal rubber 10 described with reference to FIG. 9, the molding surface 2a of the skin mold 2 with which the upper surface 31a of the seal rubber 10 contacts is a horizontal surface, and the direction of the load acting on the seal rubber 10 is the same. Is the vertical direction, and the seal rubber 10 is compressed and deformed in the vertical direction.

  FIG. 15 is a graph showing the relationship between the amount of flexure of the seal rubber and the load according to this embodiment. In the graph shown in FIG. 15, the horizontal axis represents the displacement (mm) corresponding to the bending amount of the seal rubber 10, and the vertical axis represents the load acting on the seal rubber 10, that is, the load (N as a reaction force due to the elasticity of the seal rubber 10). ) Is shown.

  As can be seen from the graph shown in FIG. 15, while the amount of flexure of the seal rubber 10 reaches from 0 mm to about 10 mm, the load rises relatively gently from 0 N to about 30 N. Then, before the deflection amount of the seal rubber 10 reaches 10 mm, the degree of increase in the load due to the increase in the deflection amount becomes relatively steep, and the load becomes 72 N when the deflection amount is 12 mm.

  The magnitude of the load needs to be set so that the clamping force does not become excessive in consideration of the clamping force of the clamping mechanism 6 of the skin type 2 and the reservoir tank 3. From this point of view, in the seal rubber 10 according to the present embodiment, the load per length of 50 mm is preferably 50 N or less. Therefore, according to the seal rubber 10 according to the present embodiment, it is possible to obtain a bending amount of at least 11 mm. In this embodiment, the load when the bending amount is 11 mm is 45.8N.

  According to the seal rubber 10 of the present embodiment, it is possible to suppress a sharp increase of the load in a wide range (between 0 and about 10 mm) of the deflection amount, and to suppress the load of the seal rubber 10 as a whole and to sufficiently bend the deflection. It has been demonstrated that quantities can be obtained. As a structural factor of the load suppressing action of the seal rubber 10, the side surface portion 32 of the contact side tubular portion 21 and the side wall portion 26 of the intermediate space forming portion 23 may have thin portions 32b and 26d, respectively.

  Further, according to the seal rubber 10 according to the present embodiment, if the inclination angle from the horizontal plane is up to about 15 °, lateral deformation can be suppressed in the deformation mode of the seal rubber 10, and stable flexural deformation can be obtained. It is obtained as an experimental result.

  Further, according to the seal rubber 10 according to the present embodiment, due to its characteristic, the seal property for preventing the leakage of the powder material 4 can be obtained in the state of being bent by 1 mm in the vertical direction. Therefore, when the total bending amount of the seal rubber 10 is set to 11 mm, at least 1 mm thereof is used as a deformation amount for obtaining the sealing property, and the remaining 10 mm is the gap 120 (FIG. 8) accompanying the deformation of the skin mold 2. It is used as a range of the amount of bending (deformation allowance) to follow the change of (see). That is, in this case, since the change in the gap 120 between the skin type 2 and the reservoir tank 3 is absorbed, the maximum bending amount of 10 mm can be obtained.

1 Slush molding device 2 Skin type 2a Molding surface 2b Molding surface part 3 Reservoir tank 4 Powder material 7 Seal part 8 Moving space 10 Seal rubber (seal member)
11c Partition edge 15 Skin material (skin-like member)
20a Upper cavity 20b Lower cavity 21 Contact side tubular part 21b Outer wall surface 21d Corner 22 Clamping part 23 Intermediate space forming part 23s Space 26 Side wall part 26a Inner wall surface 26d Thin part 26e Upper slope part 26f Lower slope part 27 Leg part 31 Heaven Surface portion 31a Upper surface 32 Side surface portion 32b Thin wall portion 32c Wall surface 32d Wall surface 33 Partition wall portion 50 Notch portion

Claims (6)

A slush molding sealing member that seals between a mold having a molding surface and a reservoir tank that receives a powder material and receives the mounting of the mold to form a moving space for the powder material together with the mold. ,
A contact side tubular portion that forms a contact portion with the mold and forms a cavity along the longitudinal direction of the seal member;
An intermediate space forming portion that is provided on the attachment side with respect to the edge portion of the reservoir tank with respect to the contact side tubular portion and that forms a space along the longitudinal direction of the seal member together with the contact side tubular portion;
A holding portion for holding the edge portion of the reservoir tank,
The intermediate space forming portion includes a pair of side wall portions facing each other in the width direction of the seal member,
The side wall portion has an inner wall surface that includes a sloped surface that is substantially symmetrical with respect to the up-down direction, and has a curved surface with the outer side in the width direction being a convex side in the up-down direction, whereby A slush molding seal member, characterized in that the central portion is the thinnest portion. A seal member for slush molding for sealing between a mold having a molding surface and a reservoir tank that receives a powder material and receives the mounting of the mold to form a moving space for the powder material together with the mold. ,
A contact side tubular portion that forms a contact portion with the mold and forms a cavity along the longitudinal direction of the seal member;
An intermediate space forming portion that is provided on the attachment side of the contact side tubular portion with respect to the edge portion of the reservoir tank, and that forms a space along the longitudinal direction of the seal member together with the contact side tubular portion;
A holding portion for holding the edge portion of the reservoir tank,
The intermediate space forming portion includes a pair of side wall portions facing each other in the width direction of the seal member,
The contact side tubular portion,
A top surface portion that forms a contact surface with the mold,
A pair of side surfaces facing each other in the width direction of the seal member,
A partition wall portion that partitions the space formed by the hollow space of the contact side tubular portion and the intermediate space forming portion that is a surface portion facing the top surface portion,
The slush molding seal member, wherein the contact surface is formed in a flat shape, and is formed so as to form an angle with the outer wall surface of the contact side tubular portion. The slush molding seal member according to claim 2, wherein the top surface portion is formed to be thicker than the side surface portion. The side surface portion has an outer wall surface that is flat along the vertical direction of the seal member, and has an inner wall surface that is a curved surface with the outer side in the width direction being a convex side in the vertical direction. Thus, the slush molding seal member according to claim 2 or 3, wherein the slush molding seal member has a shape in which the wall thickness is gradually reduced from both ends to the center in the vertical direction. The dimension of the intermediate space forming portion in the width direction of the seal member is larger than the dimension of the contact side tubular portion in the width direction. Seal member for slush molding. The side wall portion is a portion that is continuous with the sandwiching piece portion that forms the sandwiching portion, and forms a leg portion that extends downward with respect to the contact side tubular portion together with the sandwiching piece portion,
6. A cutout part, which is formed by cutting out at least a part of the leg part in order to bend or bend the seal member in the longitudinal direction, is provided in a part of the longitudinal direction. The slush molding seal member according to item 1.

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