JP3938963B2 - Molding equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention is for molding a resin molded article using a pair of molds in which cavities are formed between opposing surfaces.The success ofThe present invention relates to a shape device.
[0002]
[Prior art]
  Conventionally, as this type of molding method and molding apparatus, one using a pair of molds in which an upper mold 102 is combined with a lower mold 101 fixed on a surface plate so as to be movable up and down as shown in FIG. 1 is generally known. Yes. This is because the molten resin P is supplied from the molding material supply system 103 onto the molding surface 101a of the lower mold 101 with the upper mold 102 raised, and then the upper mold 102 is lowered to perform clamping. Thus, a resin molded product having a predetermined shape corresponding to the molding surfaces 101a and 102a facing each other of the lower mold 101 and the upper mold 102 is molded.
[0003]
  like thisNaseiAs a resin molded product to be molded by the molding apparatus, for example, there is a door trim 104 attached to the compartment side of the door of an automobile. The above-mentioned molds 101 and 102 are molds for such a door trim 104. In FIG. 1, 105 is an armrest portion and 106 is a door pocket portion. In such a door trim 104, it is necessary to form an opening 107 for attaching the switch panel and an opening 108 of the door pocket. For this reason, the door trim 104 is generally manufactured by cutting out portions corresponding to the openings 107 and 108 of the molded resin product once molded by means such as punching.
[0004]
[Problems to be solved by the invention]
  By the way, since it is preferable to form the openings 107 and 108 at the same time as the molding in a molding process rather than in a separate process, the openings for forming the lower mold 101 and the upper mold 102 are formed as shown in FIG. 109 and 110 may be added. That is, the convex mold 109 corresponding to the opening 108 is formed in the upper mold 102, and the concave mold 110 in which the convex mold 109 is fitted is formed in the lower mold 101. It is conceivable that the molten resin P is prevented from turning around a portion corresponding to the convex portion 109 by being fitted into the portion 110.
[0005]
  However, in this case, since the molten resin P is supplied when the upper mold 102 before the mold clamping is in an open state, the molten resin P flows into the concave mold part 110 as it is, or the convexity of the upper mold 102 when the mold is clamped. When the mold part 109 is fitted into the concave mold part 110, the molten resin P enters the concave mold part 110 side from the gaps between them. As a result, the part that is originally the opening of the resin molded product is covered with resin, or even if there is an opening, burr is generated around it. The inconvenience that it becomes necessary arises.
[0006]
  Further, in order to move the parting line L, which is the boundary between the convex part 109 and the concave part 110 in the above case, to an upper position and round the opening end of the opening part, as shown in FIG. When the rounded portion 110a protruding upward from the opening end of 110 and the rounded portion 109a are added to the root of the convex portion 109, the rounded portion 110a flows into the concave portion 110 of the molten resin. However, there is an inconvenience that the rounded portion 110a becomes an edge and the mold strength of the portion is weakened and the portion is easily damaged.
[0007]
  The present invention has been made in view of such circumstances, and the object of the present invention is to simultaneously perform the formation of the opening and the molding of the resin molded product while eliminating the above disadvantages.RuIt is to provide a shaping device.
[0008]
[Means for Solving the Problems]
  To achieve the above objective,First, bookinventionMolding method related toPresses the pair of molds together while pouring the molten material into the cavity formed between the opposed surfaces of the pair of molds in a state where the first and second pair of molds facing each other are brought close to each other Then, a molding method for molding a molded product by clamping is assumed. In this method, a slide mold is provided so as to be able to advance and retreat from an opening provided in a partial region of the opposed surface of the first mold toward the opposed surface of the second mold, and the slide mold projects toward the second mold. Then, the molten material is poured in the close contact state, and then the slide mold is kept in close contact with the second mold as the first mold and the second mold are clamped. Try to reverseRumoIt is.
[0009]
  aboveAccording to the methodBefore the molten material is poured into the cavity, the slide mold protrudes toward the second mold and is in close contact with the molten material, so that it melts into the parting line formed by the boundary line between the slide mold and the second mold. No material enters and therefore no burrs are generated. Moreover, after the molten material is poured, the second mold and the first mold are clamped, and the slide mold is changed to the second mold in accordance with the relative movement of the second mold toward the first mold by the mold clamping operation. In order to move backward while maintaining the close contact state, the molten material does not enter from the parting line and no burrs are generated even in the mold clamping state. In the molded product, the opening is reliably formed in the region of the slide mold in a state where no burrs are generated.
[0010]
  Claim1The described inventionaboveThe present invention relates to a molding apparatus for carrying out the molding method. That is, the claim1The described invention presupposes a molding apparatus including a first and a second pair of molds in which a cavity is formed between opposing surfaces by clamping, and a partial region of the opposing surface of the first mold A slide mold that is accommodated so as to be capable of advancing and retreating from the accommodation hole toward the opposing surface of the second mold with respect to the accommodation hole that is provided to open to the housing, and a drive unit that causes the slide mold to advance and retract. . The slide mold has the same cross-sectional shape as the opening shape of the accommodation hole in the advancing and retreating direction, and the slide mold has a tip end surface that is in close contact with the opposing surface of the second mold and can be contacted It is.
[0011]
  In the case of the above configuration, before the molten material is poured into the cavity, the driving means is driven to advance the slide mold toward the opposing surface of the second mold, so that the tip surface of the slide mold is the second mold. Since the molten material does not enter the parting line formed by the boundary line between the slide mold and the second mold, it is possible to prevent the generation of burrs. When the second mold and the first mold are clamped after the molten material is poured, the driving means is synchronized with the relative movement of the second mold toward the first mold by the mold clamping operation. Is driven in the reverse direction to keep the slide mold in close contact with the second mold, and retreats to prevent intrusion of molten material from the parting line and burr generation even in the mold clamping state. Is possible. As the molded product, the opening is reliably formed in the slide mold region without any burrs.
[0012]
  Also, aboveClaim1In the described invention, SuA curved surface that smoothly curves toward the second mold side continuously from the opening edge of the accommodation hole in a state where the slide mold is positioned at the retracted position with respect to the accommodation hole of the first mold on the outer peripheral edge portion of the ride type. While continuously formed in the circumferential direction, the slide mold is in contact with the second mold facing surface while the slide mold is in contact with the second mold facing surface. To form a curved surfaceThe
[0013]
  With thisThe parting line between the slide mold and the second mold is formed at the positions of the peripheral edges of both curved surfaces, and the opening edge of the opening formed in the molded product is smooth corresponding to both the curved surfaces. It becomes a curved shape.
[0014]
  Claim2The described invention is claimed.1In the described invention, a flat contact surface that extends in a direction perpendicular to the advancing and retreating direction of the slide mold from the periphery of the distal end of the curved surface to the inner peripheral side is continuously formed endlessly on the tip of the slide mold. A flat surface that is in close contact with the abutting surface is formed at the inner peripheral side position from the periphery of the tip of the curved surface of the second type on the opposing surface of the second type.
[0015]
  In the case of the above configuration, since the contact surface and the flat surface extending in the direction orthogonal to the advance / retreat direction are formed from the periphery of the tip of each curved surface of the slide type and the second type to the inner peripheral side, each curved surface described above Even if formed, the strength of the mold portion on which each curved surface is formed is sufficiently maintained, and there is no risk of breakage. In addition, the slide mold and the second mold can be brought into contact with each other in a state where the slide surface and the flat surface are in close contact with each other, and the contact surface and the flat surface are moved forward and backward. Therefore, even if a pressing force is applied to the second mold by the forward movement of the slide mold, sufficient support reaction force can be obtained. The maintained state can be reliably maintained. Thereby, the generation | occurrence | production of the burr | flash in a parting line can be prevented much more reliably.
[0016]
  Claim3The described invention is claimed.2In the described invention, the tip of the slide mold and the facing surface of the second mold are placed between the tip surface of the slide mold in a state where the contact surface of the slide mold is in contact with the flat surface of the second mold. A void that does not contact the opposing surface of the second mold is formed at a position on the inner peripheral side of the contact surface.
[0017]
  In the case of the above configuration, due to the presence of the space, the pressing force to the forward side for maintaining the slide mold in close contact with the second mold causes the entire tip surface of the slide mold to abut against the second mold. It is possible to reduce the pressing force to the retreating side that the slide mold receives from the second mold during mold clamping.
[0018]
  Claims4The described invention is claimed.1In the invention described above, a positioning pin that protrudes in the advancing and retreating direction of the slide mold is formed on the other side of one of the tip surface of the slide mold and the opposing surface of the second mold, and the positioning pin is provided on the other side. Relative movement in the direction perpendicular to the slide type advance and retract direction by inserting in the slide type advance and retract direction
A concave hole to be blocked is formed.
[0019]
  In the case of the above configuration, when the slide mold is moved forward to come into contact with the second mold, the positioning pin is inserted into the recessed hole, and this insertion causes a relative movement in a direction perpendicular to the advancing / retreating direction of the slide mold. Will be blocked. For this reason, the pressing force to the forward side to keep the slide mold in close contact with the second mold, the pressing force to the backward side received from the second mold during mold clamping, or the discharge of the molten material in the cavity Even when pressure is applied, it becomes possible to easily and reliably maintain the relative positional relationship in which the slide mold is in close contact with the second mold, and it is possible to reliably form an opening without occurrence of burrs in the molded product. It becomes possible.
[0020]
  And claims5The described invention is claimed.1In the described invention, the first mold is the lower mold, the second mold is the upper mold, and the slide mold is arranged so as to protrude in the vertical direction toward the second mold.
[0021]
  In the case of the above configuration, the slide mold is disposed on the side of the first mold that is the lower mold, and the slide mold rises and protrudes on the side of the second mold that is the upper mold. For example, even if it is constituted by a hydraulic cylinder or the like, the inside of the cavity is formed from the boundary surface between the opening of the first type receiving hole and the outer periphery of the slide type that can be moved up and down from the inside of the opening to the second type. It is possible to reliably prevent leakage of pressure oil to the tank.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
  Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0023]
  FIG. 5 shows an embodiment in which the molding apparatus of the present invention is applied to molding an automobile door trim 104 (see FIG. 2). In particular, FIG. 5 shows a portion of the molding apparatus for forming a pocket opening 108 that opens obliquely in the door trim 104, which corresponds to the door pocket portion indicated by 106 in the molding apparatus of FIG. Is shown. In the figure, 2 is a lower mold as a first mold, 3 is an upper mold as a second mold provided opposite to the upper side of the lower mold 2, and 4 is a slide disposed on the lower mold 2. A mold 5 is a hydraulic cylinder that drives the slide mold 4 up and down.
[0024]
  The lower mold 2 is fixed on a surface plate (not shown), and a molding surface 21 is formed on the upper surface thereof. The lower mold 2 has a supply passage (not shown) for molten resin as a molten material formed therein, and the supply passage has an opening at its downstream end facing upward at a predetermined position on the molding surface 21. On the other hand, the upstream end is connected to a molding material supply system (see 103 in FIG. 1) (not shown). The lower mold 2 is formed with a receiving hole 22 that opens to a position where the pocket opening 108 (see FIG. 2) of the molding surface 21 is formed and extends downward. 22 has an opening shape that is larger than the opening shape of the pocket opening 108 by a predetermined dimension on the outer peripheral side. Further, the molding surface 21 of the lower mold 2 is stepped in the vertical direction surrounding the opening of the accommodation hole 22, and the pocket opening 108 of the door trim 104 to be molded is opened obliquely. It is supposed to be formed.
[0025]
  The slide mold 4 is housed in the housing hole 22 so as to be able to advance and retreat in the vertical direction in a state of being tightly fitted to the inner peripheral surface of the housing hole 22. A hydraulic cylinder 5 is accommodated. The slide mold 4 has an outer peripheral surface 41 that has substantially the same cross-sectional shape as the inner peripheral surface of the receiving hole 22 in the vertical direction, and the tip end side has a generally oblique shape corresponding to the step. The slide mold 4 is continuously located at the outer peripheral side of the tip of the slide mold 4 from the periphery of the opening of the accommodation hole 22 to the inner periphery of the slide mold 4 in the retracted state of the slide mold 4 (shown by the solid line in FIG. 5). A molding surface portion 42 that forms a part of the molding surface 21 is formed in an endless annular shape in plan view, and a curved surface portion 43 that curves smoothly toward the upper die 3 continuously from the inner peripheral end of the molding surface portion 42 is a molding surface portion. Similarly to 42, it is formed to be an endless ring in a plan view. Further, a contact surface 44 having a predetermined width (for example, about 5 mm) extending in a direction orthogonal to the advancing / retreating direction from the peripheral edge of the curved surface portion 43 to the inner peripheral side is formed in an endless annular shape in plan view. Yes.
[0026]
  In addition, a positioning pin 45 projecting upward and a positioning pin 34 described later formed on the upper mold 3 side are fitted into the tip end of the slide mold 4 and the inner peripheral side position of the contact surface 44. The recessed holes 46 are alternately formed at predetermined intervals in a direction perpendicular to the paper surface of FIG. Further, the portion between the positioning pin 45 and the recessed hole 46 and the contact surface 44 is in a state where the slide mold 4 protrudes and the contact surface 44 contacts the upper mold 3 (the state shown in FIG. 6). (See FIG. 6 and FIG. 7), the shape is set so that an annular space 47 (see FIGS. 6 and 7) is formed between the slide die 4 and the upper die 3 so as to surround the positioning pin 45 and the recessed hole 46. Thus, the slide mold 4 and the upper mold 3 are not in contact with each other in the above portion.
[0027]
  The hydraulic cylinder 5 is configured so that the slide mold 4 is positioned in the retracted state in the contracted state of the rod 51 and is extended to push the slide mold 4 upward from the accommodation hole 22 to project. The hydraulic cylinder 5 receives a pressure from the upper die 3 and moves from the extended state to the contracted state at a pressure lower than the pressure from the upper die 3 and at a constant pressure. The slide mold 4 is configured to perform a reduction operation while acting on the slide mold 4. Thus, after the contact surface 44 of the slide mold 4 is brought into close contact with the upper mold 3 by the extension operation, the slide mold 4 is lowered as the upper mold 3 is lowered while maintaining the above-mentioned tight contact state when the mold is clamped. It has become. The hydraulic circuit of the hydraulic cylinder 5 includes a hydraulic cylinder that is generated when the rod 51 is shifted from the extended state to the contracted state, that is, when the slide die 4 is lowered by receiving the pressing pressure from the upper die 3. A protective circuit is provided in order to prevent the hydraulic cylinder 5 from being damaged due to an increase in pressure in the cylinder 5.
[0028]
  The upper die 3 is connected to driving means (not shown), and is in a predetermined approaching state with respect to the lower die 2 but is opened upward (the state shown in FIG. 5) and a clamped state (shown in FIG. 7). State). A molding surface 31 is formed on the lower surface of the upper mold 3 so that a cavity is formed between the molding surface 31 and the molding surface 21 of the lower mold 2 opposite to the molding surface 31 in the clamped state. It has become. Further, the lower surface of the upper mold 3 and the portion facing the tip of the slide mold 4 are continuously located from the molding surface 31 at a position facing the curved surface portion 43 of the slide mold 4 in the vertical direction. A curved surface portion 32 that smoothly curves on the lower mold 2 side is formed so as to have an endless annular shape when viewed from below. In addition, a flat surface 33 that can be brought into close contact with the entire surface of the contact surface 44 from the peripheral edge to the inner peripheral side of the curved surface portion 32 is formed to spread over at least the same width as the contact surface 44. ing. Then, the curved surface portion 32 of the upper mold 3 and the curved surface portion 43 of the slide mold 4 are smoothly and continuously connected in a state where the contact surface 44 is in close contact with the flat surface 33 (see FIGS. 6 and 7). An arcuate opening peripheral edge is formed as the opening 108 for use.
[0029]
  Further, at the inner peripheral side position of the flat surface 33, a positioning pin 34 that protrudes downward and fits into the recessed hole 46 of the slide mold 4 and a recess that fits the positioning pin 45 of the slide mold 4 from below is provided. The holes 35 are alternately formed in the direction perpendicular to the paper surface of FIG. The positioning pins 45 and the concave holes 35 and the positioning pins 34 and the concave holes 46 provided above and below are closely fitted to each other with the contact surface 44 of the slide mold 4 being in close contact with the flat surface 33 of the upper mold. As a result, even if the slide mold 4 receives pressure in a direction (horizontal direction) perpendicular to the advancing / retreating direction, relative movement of the slide mold 4 in the horizontal direction is prevented.
[0030]
  Next, a molding method using the molding apparatus having the above configuration will be described. As an initial setting before molding, the slide mold 4 is positioned in a retracted state with respect to the accommodation hole 22 of the lower mold 2 as shown in FIG. The upper die 3 is opened with respect to the lower die 2 in the state. First, the hydraulic cylinder 5 is extended to raise the slide die 4 toward the upper die 3 so that the abutment surface 44 abuts against the flat surface 33 of the upper die 3 and presses the slide die 4 and the upper die 3 together. Stop with pressure applied. As a result, as shown in FIG. 6, the contact surface 44 and the flat surface 33 are in close contact with each other, and the upper and lower curved surface portions 32 and 43 are continuously formed between the molding surfaces 31 and 21 facing each other vertically. A portion corresponding to the pocket opening 108 is blocked. At the same time, the upper and lower positioning pins 34 and 45 are tightly fitted into the opposed concave holes 46 and 35 so that the relative displacement of the slide mold 4 in the horizontal direction is prevented. In addition, as shown by two solid arrows in FIG. 6, the tact time required for the molding operation can be shortened by lowering the upper die 3 in synchronization with the raising of the slide die 4.
[0031]
  Next, a predetermined amount of molten resin P is supplied from the molding material supply system onto the molding surface 21 of the lower mold 2 through the supply passage. At this time, since the molten resin P is blocked by the outer peripheral surface 41 of the protruding slide mold 4, the molten resin P does not flow into the accommodation hole 22 side.
[0032]
  Finally, the upper mold 3 is lowered toward the lower mold 2 to perform mold clamping. At this time, the slide mold 4 is lowered as the upper mold 3 is lowered while maintaining the contact surface 44 of the slide mold 4 in close contact with the flat surface 33 of the upper mold 3 (one point of FIG. 6). (See the two arrows shown by chain lines). Then, as shown in FIG. 7, when the slide mold 4 is lowered to the retracted state, the slide mold 4 is stopped to be in a mold clamping state. In this clamping state, the pressing force from the upper die 3 is applied to the lower die 2 and the pushing force from the slide die 4 is applied to the upper die 3 for a predetermined time while the outer peripheral sides of the upper die 3 and the lower die 2 are in contact with each other. In this state, the molten resin P is cured. As a result, the pocket opening 108 of the door trim 104 (see FIG. 2) is formed by the curved surfaces 32 and 43 on the outer peripheral side where the contact surface 44 of the slide mold 4 and the flat surface 33 of the upper mold 3 are in close contact. It will be.
[0033]
  Such molding equipmentIn placeAccordingly, before the molten resin is supplied, the slide mold 4 can be protruded so that the contact surface 44 and the flat surface 33 of the upper mold 3 are in close contact with each other. Even if P is supplied, the molten resin P can be reliably prevented from entering the housing hole 22 side. Moreover, the upper die 3 and the slide die 4 can be synchronized and lowered to the lower die 2 side while maintaining the contact surface 44 and the flat surface 33 in close contact with each other during mold clamping. It is possible to reliably prevent the molten resin P from entering the parting line that is the boundary line between the curved surfaces 32 and 43 of the slide mold 4 and the upper mold 3. As a result, it is possible to simultaneously form the door trim 104 and form the pocket opening 108 while reliably preventing the generation of burrs and molding defects at the opening of the parting line and the receiving hole 22.
[0034]
  Further, the slide mold 4 and the upper mold 3 are brought into contact with each other by the contact surface 44 and the flat surface 33 having a certain spread in the direction orthogonal to the advancing and retreating direction of the slide mold 4 to form the pocket opening 108. Since the curved surface portions 32 and 43 of the slide mold 4 and the upper mold 3 are continuously formed on the contact surface 44 and the flat surface 33, a curved surface is formed as shown in FIG. The mold part does not have an edge shape, the strength of the mold part of each of the bay curved surface portions 32 and 43 can be sufficiently maintained, and no unexpected damage is caused.
[0035]
  Furthermore, since the combination of the concave holes 35 and 46 and the positioning pins 45 and 34 is used, it is possible to reliably prevent the horizontal displacement of the slide mold 4 that is in close contact with the upper mold 3. In particular, the supply pressure of the molten resin P supplied onto the molding surface 21 is different on both sides of the slide mold 4 and the slide mold 4 receives different pressures depending on the horizontal direction due to the molten resin P when clamping. In order to form the pocket opening 108 obliquely, there are steps on the molding surfaces 21 and 21 on both sides of the slide mold 4, and the pressure from the molten resin P acts unevenly so that the slide mold 4 is inclined. Even if it exists, it can maintain reliably between the upper mold | types 3 reliably, without causing the position shift and inclination of the slide mold | type 4. For this reason, even in each case as described above, the contact state between the contact surface 44 and the flat surface 33 is reliably maintained when the mold is clamped to lower the slide die 4 from the protruding state to the retracted state. Occurrence can be prevented more reliably.
[0036]
  In addition, a space 47 is formed between the slide mold 4 pushed up by the hydraulic cylinder 5 and pressed against the flat surface 33 of the upper mold 3, and the upper mold 3. The area of the abutment surface 44 of the abutting slide mold 4 is smaller by the presence of the space 47 than when the entire abutting surface of the slide mold 4 abuts. For this reason, the contact degree with respect to the upper mold | type 3 of the contact surface 44 surrounding the outer periphery of the said slide type | mold 4 can be raised, and the burr | flash generation | occurrence | production in the parting line of the contact surface 44 and the flat surface 33 is prevented more reliably. can do. In addition, the pressing force acting on the slide mold 4 can be further reduced by the lowering operation of the upper mold 3, and the slide mold 4 can be protected.
[0037]
  Further, since the accommodation hole 22 is provided on the lower mold 2 side and the slide mold 4 can be moved up and down from the lower mold 2 side to the upper mold 3 side, a hydraulic cylinder 5 is employed as a lifting drive means for the slide mold 4. In addition, the oil leakage can be prevented from oozing out toward the molding surface 21 through the boundary surface between the peripheral surface 41 of the slide mold 4 and the inner peripheral surface of the accommodation hole 22.
<Other embodiments>
  In addition, this invention is not limited to the said embodiment, Various other embodiments are included. That is, in the above embodiment, the first and second pair of molds are arranged one above the other. However, the present invention is not limited to this, and the first and second molds are arranged sideways. Also good. In this case, the slide mold may be disposed so as to be able to advance and retreat laterally from either one of the first and second molds.
[0038]
  In the above embodiment, the positioning pins 45 and the recessed holes 46 are alternately formed on the slide mold 4 side, and the recessed holes 35 and the positioning pins 34 are alternately formed on the upper mold 3 side. Instead, one set of one positioning pin formed on one of the slide mold 4 and the upper mold 3 and one concave hole formed on the other may be provided. Further, when the flow pressure from the molten resin in the cavity around the slide mold 4 is almost balanced, or when there is no step on the molding surface around the slide mold 4, the positioning pin and the recessed hole are used. The prevention of slide-type lateral deviation may be omitted.
[0039]
  Further, in the above embodiment, the accommodation hole 22 is formed on the lower mold 2 side and the slide mold 4 is disposed on the lower mold 2 side. A slide mold may be provided on the side. In this case, it is preferable to use means such as an air cylinder as drive means for driving the slide mold back and forth. When a hydraulic cylinder is used, a sealing means or the like for preventing the pressure oil from entering the cavity is added. Is preferred.
[0040]
【The invention's effect】
  As described above, the achievement in the invention of claim 1 is achieved.FormAccording toThe formation of the opening and the molding of the resin molded product can be performed simultaneously while reliably preventing the occurrence of burrs and the like.That is, by driving the drive means to advance the slide mold toward the opposing surface of the second mold, before the molten material is poured into the cavity, the contact surface of the tip of the slide mold is moved to the second mold. A parting line in which the molten material can be brought into close contact with the opposing surface, and the molten material is formed by the boundary line between the contacted slide mold and the second mold even when the molten material is poured into the cavity. The entry of burrs can be prevented by preventing entry. In addition, after the molten material is poured, when the second mold and the first mold are clamped, the slide mold can be kept in close contact with the second mold. Also, it is possible to prevent the molten material from entering from the parting line and to prevent the generation of burrs. As a result, the molded product can be reliably molded in the state where the opening does not generate burrs in the region of the slide mold.
[0041]
  And moreIn addition to the effect, the opening edge of the opening formed in the molded product can be molded into a smoothly curved shape corresponding to both curved surfaces.
[0042]
  Claim2According to the described invention, the claims1In addition to the effects of the described invention, even if a curved surface is formed in the mold to make the opening edge of the opening formed in the molded product a curved shape, the strength of the mold part forming the curved surface is sufficient. Therefore, it is possible to reliably eliminate the possibility of breakage and to more reliably prevent the occurrence of burrs in the parting line.
[0043]
  Claim3According to the described invention, the claims2In addition to the effects of the described invention, the presence of a void causes the forward pressing force to keep the slide mold in close contact with the second mold. As compared with the case of abutting, it can be made smaller, and the pressing force to the backward side that the slide mold receives from the second mold during mold clamping can be made smaller.
[0044]
  Claims4According to the described invention, the claims1In addition to the effects of the described invention, even when the mold is clamped with the slide mold in close contact with the second mold, the slide mold is prevented from relative movement in the direction perpendicular to the advancing and retreating direction of the slide mold. The relative positional relationship in intimate contact with the second mold can be easily and reliably maintained, whereby an opening without burrs can be reliably formed in the molded product.
[0045]
  And claims5According to the described invention, the claims1In addition to the effects of the described invention, even if the drive means is constituted by, for example, a hydraulic cylinder or the like, it is possible to reliably prevent leakage of pressurized oil into the cavity.
[Brief description of the drawings]
FIG. 1 is an explanatory cross-sectional view showing an example of a conventional resin molding method and molding apparatus.
2 is a front view showing an example of a final molded product manufactured by the molding method and molding apparatus of FIG. 1. FIG.
FIG. 3 is a partial cross-sectional view showing an example of a molding apparatus conceivable for integrally molding an opening in a molded product.
4 is a partial cross-sectional view showing an example of a molding apparatus different from FIG. 3;
FIG. 5 is a partial cross-sectional view showing a molding apparatus according to an embodiment of the present invention.
6 is a view corresponding to FIG. 5 showing a state in which the slide mold is raised and brought into close contact with the upper mold.
FIG. 7 is a diagram corresponding to FIG.
[Explanation of symbols]
2 Lower mold (1st mold)
3 Upper mold (2nd mold)
4 Slide type
5 Hydraulic cylinder (drive means)
21, 31 Molding surface (opposite surface)
22 accommodation hole
32, 43 Curved surface (curved surface)
33 flat surface
34, 45 Positioning pin
35, 46 recessed hole
44 Contact surface (tip surface)
P Molten resin (molten material)

Claims (5)

In a molding apparatus including a first and a second pair of molds in which a cavity is formed between opposing surfaces by being clamped,
A slide mold accommodated so as to be able to advance and retract from the accommodation hole toward the opposing surface of the second mold with respect to the accommodation hole provided so as to open in a partial region of the opposing surface of the first mold;
Drive means for moving the slide mold forward and backward, and
With
The slide mold has the same cross-sectional shape as the opening shape of the accommodation hole in the forward / backward direction, and the tip end surface of the slide mold is configured to be in close contact with and contact with the opposing surface of the second mold,
The outer peripheral edge of the slide mold is curved so as to be smoothly curved toward the second mold side continuously from the opening edge of the housing hole in a state where the slide mold is positioned at the retracted position with respect to the first mold housing hole. While the surface is formed continuously in the circumferential direction,
A curved surface that is smoothly curved continuously from the periphery of the tip of the curved surface of the slide mold is formed on the opposed surface of the second mold in a state where the slide mold is in contact with the opposed surface of the second mold. ing
A molding apparatus characterized by that. In claim 1,
On the tip of the slide mold, a flat contact surface extending in a direction orthogonal to the slide mold advance / retreat direction is continuously formed in an endless manner from the peripheral edge to the inner peripheral side of the curved surface,
2. A molding apparatus according to claim 1, wherein a flat surface that is in close contact with the abutting surface is formed on the opposing surface of the second mold from the periphery of the tip of the curved surface of the second mold to the inner peripheral side position . In claim 2,
The tip of the slide mold and the opposing surface of the second mold are opposed to each other between the tip of the slide mold and the second mold in a state where the contact surface of the slide mold is in contact with the flat surface of the second mold. A molding apparatus characterized in that a space that does not contact the surface is formed at an inner peripheral side position of the contact surface . In claim 1 ,
One of the tip surface of the slide mold and the opposing surface of the second mold is formed with a positioning pin that protrudes in the forward and backward direction of the slide mold on the other side, while the positioning pin slides on the other side. A molding apparatus characterized in that a concave hole is formed to be inserted in the advancing / retreating direction of the mold to prevent relative movement in a direction orthogonal to the advancing / retreating direction of the slide mold . In claim 1 ,
A molding apparatus characterized in that the first mold is a lower mold, the second mold is an upper mold, and the slide mold is arranged so as to protrude upward and downward toward the second mold .

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