JP5453384B2 - Mold for resin molding - Google Patents

Description

  The present invention relates to a mold for obtaining a molded product having an undercut portion from a resin raw material.

  Conventionally, what was described in the following patent document 1 is known as this kind of metal mold | die. In this mold, a part of the cavity formed between the fixed mold and the movable mold is formed by one insert that forms the undercut part of the molded product, and the insert undercut is removed when the mold is opened. It has a link that slides in the direction. The insert is connected to the tip of the link rod so as to be swingable in a fixed direction via a single pivot shaft, and is configured to slide by the drive of the link and to detach from the undercut portion of the molded product. ing.

Japanese Utility Model Publication No. 61-192818

By the way, according to the mold described in the above-mentioned patent document, the moving direction of the insert forming the undercut portion of the molded product is the direction perpendicular to the mold opening direction, that is, the same direction as the undercut drawing direction. Therefore, a link having a complicated configuration must be used as the nested drive mechanism. Further, since the nest is connected to the link rod by one pivot shaft, it can swing only in the vertical direction. However, since these configurations only use one nest, there is no problem.
However, when trying to obtain a molded product having a plurality of undercut portions with different punching directions by compression molding, a plurality of nestings corresponding to the molded product are required. Therefore, the problem that a molded article cannot be taken out from all the inserts or becomes extremely difficult is assumed. Moreover, there is a possibility that the configuration becomes extremely complicated and cannot be realized at low cost.

  The present invention has been made in view of the above-described conventional problems, and even if it is a difficult-to-mold molded product having a plurality of undercut portions with different pulling directions, it can be securely and easily nested. An object of the present invention is to provide a mold for resin molding that can be removed.

In order to achieve the above object, a mold for resin molding according to the present invention includes a first mold body and a second mold body each having inner surfaces capable of forming a cavity for synthetic resin molding by closing the mold, An insert having an undercut forming portion that is supported by the first mold body in a cavity so as to be able to move in and out and forms a part of the cavity to form an undercut portion of a molded product, and connected to the insert and being released In order to take out the molded product from the first mold body, the mold includes a take-out rod that is removably arranged in the shaft hole of the first mold body, and a plurality of pairs of the insert and the take-out rod are provided. And at least two of the plurality of inserts are arranged in different directions in which the undercut removal direction is different, and each insert is movably connected to the tip of each take-out rod via a joint. To the tip of the rod Is formed in the engaging groove extending in the undercut removal direction of the insert and the tip of the insert or take-out rod, and is freely movable in the undercut removal direction in the engagement groove. is the structure which is characterized that you have a locking hook connected to.

  And in each above-mentioned structure, the removal mechanism which removes the undercut formation part of a nest from a molded product by pushing the molded product taken out from the 1st mold while being supported by the nest in the undercut removal direction. The first mold body is provided.

  According to the mold for resin molding according to the present invention, a plurality of pairs of nesting and unloading rods are arranged, and at least two nestings among the plurality are arranged so that the undercut extraction direction is different, and each nesting is Since the tip of each take-out rod is movably connected via a joint, the molded product is pulled out from the first mold body integrally with the insert by driving the take-out rod after the mold is opened. Thereafter, the undercut portion of the molded product is removed from the undercut forming portion of the one insert by pressing the formed product in the direction of undercut removal of the one insert by hand or the like. Next, when the molded product is pushed in the direction of the undercut of the other insert, the undercut portion of the molded product is detached from the undercut forming portion of the other insert. Thus, the entire molded product can be easily removed from the plurality of inserts. During these removal operations, each insert can move freely with respect to the take-out rod, so that the molded product can be removed very easily and reliably from the undercut forming portion of the insert.

Further, joint, and a locking groove formed in the extraction rod or nested, from being configured with a locking hook formed on the insert or eject rod, the locking groove and a locking Since a useful joint is realized by a very simple structure called a collar, the insert can easily move, there is little failure, and it can be provided at low cost.

  In the case where the removal mechanism is provided in the first mold body, the molded product taken out from the first mold body while being supported by the insert is pushed by the removal mechanism in the undercut removal direction from the molded product. Since the undercut forming portion of the insert is removed, a molded product having a relatively high temperature immediately after molding can be automatically removed from the insert without touching it by hand. Thereby, while ensuring the safety | security of operation | work, a suitable metal mold | die can be provided from a viewpoint of mass-producing a molded article.

It is the perspective view which looked up the molded product obtained using the metal mold | die for resin molding which concerns on one Embodiment of this invention from back diagonally downward. It is a side block diagram including the partial cross section of a molding machine provided with the said metal mold | die. It is a top view which shows the fixed mold | type of the said metal mold | die, a nest | insert, and a division | segmentation type | mold. It is an enlarged side view including the partial cross section which shows the said fixed mold | type and nest | insert. It is a figure which shows the front-end | tip part of the said insert and the rod for extraction, Comprising: (a) is a partial right view, (b) is a partial front view. It is a figure which shows the front-end | tip part of the said insert and the rod for extraction, Comprising: (a) is a partial left view, (b) is an AA arrow directional cross-sectional view in (a). It is a figure which shows the operation | movement state of the insertion with respect to the said extraction rod, Comprising: (a) is sectional drawing which shows the state which moved the insertion to the undercut removal direction, (b) moved the insertion to the up-down direction. (C) is a cross-sectional view showing a state where the head is swung backward, and (d) is a cross-sectional view showing a state where the nest is swung forward. It is a partial front sectional view which expands and shows the said metal mold | die and molded product. It is a figure which expands and shows the aspect which takes out a molded article from the said metal mold | die, Comprising: (a) is a fragmentary front sectional view which shows the state which opened the movable mold after shaping | molding, (b) is in the state of (a). Subsequently, a partial front sectional view showing a state in which the molded product is taken out from the fixed mold together with the insert, and (c) is a state in which one side of the molded product and the insert are moved in the undercut removal direction following the state of (b). FIG. It is a top view which shows four removal mechanisms arranged in the fixed mold | type of the metal mold | die for resin molding which concerns on another embodiment of this invention. FIG. 2 is a diagram showing the removal mechanism, where (a) is a front configuration diagram showing a relationship with a fixed mold, and (b) is a part showing a state in which a turning member of the removal mechanism turns horizontally to remove a molded product from the insert. It is a front block diagram. It is a partial back view which shows the front-end | tip part of the nesting of the metal mold | die which concerns on other embodiment of this invention, and the rod for extraction.

Embodiments of the present invention will be described with reference to the drawings. The embodiment described below is merely an example embodying the present invention, and does not limit the technical scope of the present invention. FIG. 1 is a perspective view of a molded product obtained by using a mold for resin molding according to an embodiment of the present invention, as viewed from obliquely below, and FIG. 2 is a partial cross section of a molding machine including the mold. FIG. 3 is a plan view showing the fixed mold, the insert and the split mold of the mold, and FIG. 4 is an enlarged side view including a partial cross section showing the fixed mold and the insert.
In each figure, the resin molding die according to this embodiment is used for manufacturing a molded product which is a seating surface member constituting the upper surface side of a heated toilet seat, for example. In this embodiment, for example, a mold for a compression molding machine is shown. First, as shown in FIG. 1, a molded product P (a seating surface member) obtained from the above-described mold is, for example, a seating in which a front portion is formed in an arc shape in a plan view and an elliptical opening P2 is formed in a central portion. The sheet-shaped portion P1, the inner periphery P3 hanging from the inner periphery of the surface P1, and the outer periphery P4 hanging from the outer periphery of the sheet P1 are integrally formed.

  In the above-described molded product P, eight undercut portions P5I, P5I, P5I,... Are formed on the inner wall surface of the inner peripheral edge portion P3. Each undercut portion P5I is formed in a lateral groove shape recessed from the inner wall surface. Seven undercut portions P5E, P5E, P5E,... Are formed on the inner wall surface of the outer peripheral edge portion P4. Each undercut portion P5E is also formed in a lateral groove shape recessed from the inner wall surface. Three undercut portions P6, P6, and P6 formed by protrusions (not shown) of the inner surface 5A for the cavity of the split mold 5 to be described later are formed on the back surface portion of the outer peripheral edge portion P4. Each undercut part P6 is also formed in the shape of a horizontal groove depressed from the inner wall surface. Further, on the lower surface of the planar portion P1, the inner wall surface of the inner peripheral edge portion P3, and the inner wall surface of the outer peripheral edge portion P4, trace portions P7, P7, and P7 due to the cavity inner surfaces 41 of 15 inserts 4 described later, respectively. ,... (Indicated by a one-dot chain line in FIG. 1) appear.

  And the compression molding machine S which shape | molds the said molded article P has the pressurization capability of 2000 ton class, for example, and is equipped with the metal mold | die 1 as shown to FIG. 2 and FIG. The mold 1 includes a fixed mold 2 (an example of a first mold body) 2 supported on body frames 10, 10 erected on a main body base 9, and can be moved in and out of the fixed mold 2 (in the direction of arrow U or opposite). .., For example, which are supported in the direction), and are vertically moved so as to be close to and away from the fixed mold 2 (in the direction of arrow D or The movable die 3 is arranged in the opposite direction), and the split die 5 is arranged at the upper rear side of the fixed die 2 and moves back and forth (in the direction of arrow B or in the opposite direction) so as to be close to and away from the fixed die 2. . And the cavity C which shape | molds said molded article P is the cavity inner surface 21 of the fixed mold | type 2, the cavity inner surface 31 of the movable mold | type 3, and the cavity inner surface of the split mold | die 5 in the state in which the metal mold | die 1 was closed. Are formed from cavity inner surfaces 41, 41, 41,... The movable die 3 is configured to be moved up and down and pressurized by a hydraulic cylinder (not shown).

  Eight receiving surfaces 22, 22, 22,... That are depressed downward are located in a region constituting the cavity inner surface 21 in the fixed mold 2 and adjacent to the position where the inner peripheral edge P 3 of the molded product P is formed. Are formed at appropriate intervals in the circumferential direction. Similarly, seven similar receiving surfaces 22, 22, 22,... Are formed at positions adjacent to the positions where the outer peripheral edge P <b> 4 of the molded product P is formed. Each of these receiving surfaces 22 is formed in a cylindrical taper shape that narrows downward. A shaft hole 23 is formed in the bottom surface of each receiving surface 22 so as to penetrate the fixed mold 2 up and down. Each shaft hole 23 is formed such that its axial center direction is parallel to the mold opening direction of the movable mold 3 from the fixed mold 2 (the direction opposite to the arrow D in FIG. 2). Each shaft hole 23 is provided with a take-out rod 6 for taking out the molded product P at the time of mold release from the fixed mold 2 so as to be movable in the vertical direction (in the direction of arrow U and in the opposite direction). Further, the insert 4 is inserted into each receiving surface 22 so as to be able to move up and down. The outer peripheral surface of each insert 4 is formed in a cylindrical taper shape that narrows downward, and is detachably fitted to each receiving surface 22. The upper end portion of each take-out rod 6 is connected to the lower portion of each insert 4. That is, 15 pairs of the insert 4 and the take-out rod 6 connected to the insert 4 are provided in this example, but the present invention is not particularly limited to the number of pairs.

  Support frames 8 and 8 are erected on a main body base 9 at a position below the fixed mold 2, and a lifting platform 7 is arranged on the support frames 8 and 8 so as to be movable up and down. The elevator 7 is driven up and down by a hydraulic cylinder (not shown) driven by, for example, hydraulic oil supplied from the supply pipe 27. The lower ends of the take-out rods 6 are respectively passed through 15 through holes 13 formed in the lifting platform 7 and fixed by fixing jigs 14 and bolts 15. The split mold 5 is installed on the upper surface of the rear part of the fixed mold 2 so as to be movable back and forth, and is connected to the rod 11 of the hydraulic cylinder 12 and driven in the front-rear direction (the direction of arrow B in FIG. 2 or the opposite direction). The front surface of the split mold 5 is in close contact with the mating surface 24 of the fixed mold 2 when the mold is closed. An undercut forming portion (not shown) for forming an undercut portion P6 on the back surface side of the molded product P is provided on the cavity inner surface 5A at the front upper end portion of the split mold 5. Thus, the mating surface 25 around the outside of the cavity inner surface 21 in the fixed mold 2 is in close contact with the mating surface 32 of the movable mold 3 when the mold is closed, and the mating surface 26 inside the cavity inner surface 21 is closed. Sometimes it comes into close contact with the mating surface 33 of the movable mold 3.

  The above described insert 4 has various outer shapes depending on the position of the undercut forming portion 43 that forms the undercut portions P5I and P5E of the molded product P and the surface shape of the inner surface 41 for the cavity. An example is shown in FIGS. The illustrated insert 4 is formed with a guide groove 44 that is recessed upward and extends in the entire left-right direction on the bottom surface thereof. Further, a locking groove 45 that is wider than the guide groove 44 and extends in the left-right direction (the direction of arrow V (= undercut-out direction) or the opposite direction in FIG. 6) is formed above the guide groove 44. . The right side of the locking groove 45 is a dead end on the wall surface, but the left side is open to the outside. The bottom surfaces on both sides in the locking groove portion 45 are receiving surface portions 50, 50. The upper end portion of the take-out rod 6 is a narrow width portion 16 having a narrower front-rear width than the rod outer diameter. At the upper end portion of the narrow width portion 16, a locking collar portion 17 projecting forward and backward from the narrow width portion 16 is formed. That is, the engaging groove portion 45 of the insert 4, the engaging flange portion 17 of the take-out rod 6 inserted into the engaging groove portion 45 of the insert 4, and the engagement accommodated freely in the engaging groove portion 45. The retaining plate 47 that prevents the retaining portion 17 from coming off to the left and the bolt hole 48 of the retaining plate 47 mounted on the back surface of the locking groove 45 are passed through and screwed into the female screw hole 46 of the insert 4. The joint 18 is composed of the bolt 49 that fixes the fastening plate 47. In this case, a gap of the maximum dimension T1 is provided between the locking collar portion 17 of the take-out rod 6 and the ceiling surface or the receiving surface portion 50 in the locking groove portion 45 of the insert 4. A gap having a maximum dimension T <b> 2 is provided between the base of the narrow width portion 16 and the lower surface of the insert 4 in the take-out rod 6. A gap having a maximum dimension T3 is provided between the locking collar 17 and the inner wall of the locking groove 45 or the inner surface of the retaining plate 47. As a result, the inserts 4 are connected to the distal end portions of the take-out rods 6 via the joints 18 so as to be movable in the undercut-out direction and freely movable.

Here, the floating state of the insert 4 with respect to the take-out rod 6 will be described. In that case, it demonstrates as a motion from the original state shown in FIG.6 (b).
Since the take-out rod 6 does not move in the horizontal direction, as shown in FIG. 7A, when the insert 4 is pushed to the left in the figure, the insert 4 causes the front inner wall 45A of the locking groove 45 to move. It can move freely while having play in the direction of arrow V (undercut removal direction) until it comes into contact with the front surface 17A of the locking collar 17 of the take-out rod 6. Further, even when the insert 4 is not supported from the bottom as when lifted upward from the fixed mold 2, the insert 4 remains on the ceiling surface of the locking groove 45 as shown in FIG. Until 45B comes into contact with the upper surface 17B of the locking rod portion 17 of the take-out rod 6, it can be lowered freely by its own weight toward the take-out rod 6. Then, when the insert 4 is further pushed leftward from the state of FIG. 7A, the insert 4 is such that the ceiling surface 45B of the locking groove 45 has a locking hook portion as shown in FIG. 7C. Until it abuts on the left end of the upper surface 17B of 17, it tilts downward from the previous posture. At this time, the right end portion of the lower surface of the protruding portion of the locking collar portion 17 is supported in contact with the receiving surface portion 50 of the locking groove portion 45. On the other hand, when the insert 4 is pushed rightward from the state shown in FIG. 6B in which the locking collar portion 17 is in contact with the retaining plate 47, the insert 4 is engaged as shown in FIG. It tilts downward to the right until the ceiling surface 45B of the stop groove portion 45 comes into contact with the right end portion of the upper surface 17B of the locking collar portion 17. At this time, the left end portion of the lower surface of the protruding portion of the locking collar portion 17 is supported in contact with the receiving surface portion 50 of the locking groove portion 45.

  As described above, all the nests 4 are arranged so that the longitudinal direction of each guide groove 44 faces the left-right direction of the fixed mold 2. In this case, as is apparent from FIGS. 1, 2 and 8, the three nestings 4, 4, 4 and the outer peripheral edge of the left part are arranged in contact with the inner peripheral part P3 of the right part of the molded product P. Undercut direction of the three inserts 4, 4, 4 arranged in contact with P 4 and the three inserts 4, 4, 4 arranged in contact with the inner peripheral edge P 3 of the left part of the molded product P The undercut forming portions 43 of these inserts 4 are arranged so that the undercut removal directions of the three inserts 4, 4, 4 arranged in contact with the outer peripheral edge portion P4 on the right side are substantially opposite to each other. The position is specified. In addition, with respect to the undercut extraction direction of the above-mentioned 12 inserts 4, 4, 4,..., One insert 4 arranged in contact with the front inner side of the outer peripheral edge P4, and the inner peripheral edge The undercut extraction directions of the two nests 4 and 4 arranged in contact with the rear portion of P3 are different. Therefore, the 15 inserts 4, 4, 4,... Are arranged so that the undercut removal direction, that is, the protruding direction of the undercut forming portion 43 is substantially different.

Next, the operation of the mold 1 of the compression molding machine S configured as described above will be described.
In this case, it is assumed that the entire mold 1 is heated to a predetermined temperature prior to the molding operation. Moreover, as a synthetic resin material, a sheet molding compound (abbreviated as SMC) is used as an example. This SMC is a molding material in which a glass fiber mat is impregnated with an unsaturated polyester resin and then gelled. Therefore, the inserts 4, 4, 4, 4... Are accommodated to a predetermined position in the receiving surfaces 22, 22, 22,. As a result, the cavity inner surface 41 does not shift due to withstanding the high pressure during compression. Further, the split mold 5 is placed at a predetermined position at the rear of the fixed mold 2. In this state, after the required amount of SMC is uniformly placed on the cavity inner surfaces 21 and 41 of the fixed mold 2 and the insert 4, the movable mold 3 is lowered toward the fixed mold 2 and the split mold 5. The respective mating surfaces 25, 32, 26, 33 are brought into close contact with each other and the molds are closed. Thus, as shown in FIG. 8, the cavity inner surface 21 of the fixed mold 2, the cavity inner surface 41 of the insert 4, the cavity inner surface 31 of the movable mold 3, and the cavity inner surface 5 </ b> A of the split mold 5. A sealed cavity C is formed. The SMC melts and spreads throughout the cavity C due to the pressure and temperature in the mold at this time, and is molded as a molded product P. The SMC may be molded under ordinary conditions. For example, it is sufficient that the molding temperature is 120 to 140 ° C., the molding pressure is 50 to 100 kg / cm 2, and the curing time is 3 to 6 minutes.

  In the molded product P thus obtained, a glossy design surface is formed by the cavity inner surface 31 of the movable mold 3 on the upper surface of the planar portion P1, and the cavity of the fixed mold 2 is formed on the lower surface of the planar portion P1. Are formed on the inner surface 21 for use and the inner surfaces 41, 41, 41,. When the molded product P is taken out, as shown in FIG. 9A, the movable mold 3 is pulled upward and the split mold 5 is moved rearward to open the mold. Thereby, the undercut forming part of the split mold 5 is pulled out from the undercut parts P6, P6, P6 of the molded product P. Thereafter, as shown in FIG. 9 (b), the 15 nestings 4, 4, 4,... , 22, 22,...

  Therefore, as shown in FIG. 9C, the molded product P and the insert 4 are pushed in the undercut removal direction (arrow V direction, right direction in the drawing) with a hand or the like wearing a heat-resistant glove. In this example, the molded product P is pushed from the outer peripheral edge P4 side toward the inner peripheral edge P3 side. At this time, the insert 4 on the right side of the drawing cannot move because the retaining plate 47 hits the locking flange portion 17 of the take-out rod 6. On the other hand, the insert 4 on the left side as viewed in the drawing can move while the locking hook portion 17 freely has play in the locking groove portion 45. Accordingly, both the portion on the outer peripheral edge P4 side and the insert 4 in the molded product P move rightward, and as a result, the portion on the inner peripheral edge P3 side in the molded product P is detached from the right insert 4 in the lateral direction. At the same time, the undercut portion P5I on the inner peripheral edge P3 side is also extracted from the undercut forming portion 43 of the right insert 4. Thereafter, after the removed inner peripheral edge P3 side is lifted in the direction of arrow R1, and subsequently the molded product P is returned in the direction of arrow R2, the undercut part on the left outer peripheral edge part P4 side P5E is pulled out from the undercut forming portion 43 of the left nesting 4 and the entire molded product P is removed from all the nestings 4, 4, 4, 4... As indicated by a two-dot chain line. .

  As described above, according to the compression mold 1, the molded product P is extracted from the fixed mold 2 integrally with the insert 4 by driving the take-out rod 6 after the mold is opened. After that, the molded product P is pushed in the undercut removal direction (arrow V direction) of the nestings 4, 4, 4,. The undercut portions P5I and P5E of the molded product P are detached from the undercut forming portions 43, 43, 43,. Next, the molded product P is pushed in the undercut removal direction (the direction opposite to the arrow V) of the other group of nestings 4, 4, 4,. The undercut portions P5E and P5I of the molded product P are detached from the undercut forming portions 43, 43, 43,. In addition, the three inserts 4, 4, 4 in the front and rear portions are different in the undercut extraction direction from the one group and the other group described above, but the molded product P can be removed by loose movement by the joint 18. That is, during these removal operations, the 15 inserts 4, 4, 4,... Can move freely with respect to the take-out rod 6 due to the presence of the joint 18, so that the undercut forming portion 43 of the insert 4 Even if there is no operation in the direction of arrow V, the entire molded product P can be easily removed only in the state of FIG.

  Further, since the joint 18 is realized by a very simple configuration of the locking groove portion 45 of the insert 4 and the locking flange portion 17 of the take-out rod 6, the insert 4 floats with respect to the take-out rod 6. It is easy and has few failures and can be provided at low cost.

  Further, the shaft holes 23, 23, 23,... Of the fixed mold 2 are all formed in parallel with the mold opening direction of the movable mold 3 (the direction opposite to the arrow D). The insert 4 can be moved in and out in the same direction as the mold opening direction. Thereby, the entrance / exit drive mechanism of the insert 4 does not need to be a complicated structure. In addition, compression molding processed at a high pressure is generally considered difficult to mold a molded product having a plurality of different undercut portions, but the mold 1 is compression molded even if it is such a molded product. It can be manufactured reliably. On the other hand, since the insert 4 protrudes into the space between the open movable die 3 and the fixed die 2 and the molded product P can be removed, the space can be effectively used as a removal space for the molded product P. it can.

  In the embodiment described above, the molded product P and the insert 4 are both pushed by hand in the direction of undercutting to remove the molded product P from the insert 4. It is not limited to that. For example, molds as shown in FIGS. 10 and 11 are also included in the present invention. In this mold, four removal mechanisms 19, 19, 19, 19 are provided in the vicinity of the cavity inner surface 21 of the fixed mold 2 and at the mating surface 26. Each detaching mechanism 19 includes a shaft hole 51 formed vertically through the mating surface 26 of the fixed mold 2, and a lifting rod 53 that is movable up and down in the shaft hole 51 and is rotatably disposed. The lower end of the lifting rod 53 positioned below the fixed mold 2 is rotatably supported by bolts 15 and the like, and the lifting platform 52 driven up and down, and the lifting rod 53 positioned above the fixed mold 2 A plate-like revolving member 60 fixed to the upper end portion with a screw 58 or the like, a spiral guide groove 55 engraved in the vertical direction on the outer peripheral surface of the elevating rod 53, a fixing jig 54, a bolt, and the like. The cam pin 56 is fixed to the lower surface portion of the fixed mold 2 and is slidably received in the spiral guide groove 55. The swivel member 60 is formed on a scoop-like portion 61 whose tip end is formed in a spoon shape, a square groove portion 62 formed by being depressed upward on the lower surface of the other end portion, and an upper surface of the other end portion. A screw insertion hole (not shown) is provided. A rectangular column portion 57 of the lifting rod 53 is fitted into the rectangular groove portion 62 of the turning member 60 to prevent rotation, and the rectangular column portion 57 is fixed by a screw 58 through a screw insertion hole.

  In this mold, after the movable mold 3 is opened, the lifting platform 52 is driven and the lifting rod 53 is raised while the molded product P is supported by the inserts 4, 4, 4,. (In the direction of arrow U in FIG. 11B). At this time, since the cam pin 56 fixed to the fixed mold 2 is guided by sliding in the spiral guide groove 55, the lifting rod 53 rotates as it rises and the swiveling member 60 is moved in the horizontal direction (FIG. 11B). ) Turn in the direction of arrow L). Then, the scooping portion 61 of the turning member 60 pushes the insert 4 in the direction of undercut removal, and the undercut molding portion 43 is removed from the undercut portion P5I of the molded product P. Thereafter, after the scooping-shaped portion 61 of the revolving member 60 that continues to rise scoops up the inner peripheral edge P3 of the molded product P, it continues to rise and pulls the molded product P away from the insert 4. When the turning member 60 scoops up the inner peripheral edge portion P3 of the molded product P, the cam pin 56 is in the rotation end position 55E in the spiral guide groove 55. Located in the straight portion of the guide groove 55, the turning member 60 holds the molded product P while stopping the turning. That is, a lower turning drive mechanism 63 that horizontally turns the turning member 60 as the lifting / lowering rod 53 moves up and down is constituted by the lifting / lowering base 52, the lifting / lowering rod 53 having the spiral guide groove 55, and the cam pin 56. . Of the detaching mechanisms 19, 19, 19, 19 shown in FIG. 10, the two detaching mechanisms 19, 19 on the upper side in the figure rotate simultaneously, and the two detaching mechanisms 19, 19 on the lower side in the figure also rotate simultaneously. It is supposed to be. However, in order to sequentially push the molded product P in different undercut drawing directions, the upper one and the lower one are rotated with a time difference.

  According to the mold of this embodiment, since the removal mechanism 19 is provided in the fixed mold 2, the molded product P taken out from the fixed mold 2 while being supported by the insert 4 is removed by the undercut by the removal mechanism 19. It can be automatically removed from the undercut forming part 43 of the insert 4 by pushing in the direction. That is, even if the molded product P has a relatively high temperature immediately after molding, it can be removed from the insert 4 without having to touch it by hand. Thereby, the safety of work is ensured and a great contribution can be made in mass-producing the molded product P.

  In the above embodiment, an example is shown in which the locking groove is formed in the lower portion of the insert and the locking collar is formed at the tip of the take-out rod. However, the present invention is not limited to that form. However, as shown in FIG. 12, a locking groove 45C is formed at the tip of the take-out rod 6 so as to extend in the undercut-out direction (a direction perpendicular to the paper surface of the drawing). A width portion 16A is vertically provided, and a locking collar portion 17C is formed at the lower end of the narrow width portion 16A. A joint 18A according to this embodiment is constituted by the locking groove portion 45C, the narrow width portion 16A, and the locking flange portion 17C. Via this joint 18A, the insert 4 is connected to the take-out rod 6 in a freely movable manner in the undercut direction and in a loose manner.

In the above, the fixed mold 2 is illustrated as the first mold body according to the present invention, and the movable mold 3 is illustrated as the second mold body according to the present invention. However, the movable mold is the first mold body, and the fixed mold is While making it a 2nd type | mold body, you may arrange | position the nest | insert which concerns on this invention to the movable type | mold so that entrance / exit is possible.
Further, in the above, the seating surface member of the heating toilet seat is given as an example of the molded product, but the molded product according to the present invention is not limited to the above-described seating surface member, and any molded product obtained by the present invention may be used. It can be suitably molded. Furthermore, although it does not specifically limit as a synthetic resin material used for the metal mold | die of this invention, For example, a block molding material (BMC), a carbon fiber reinforced plastic (CFRP), etc. other than SMC are mentioned.

1 Mold 2 Fixed mold (first mold)
3 Movable type (second type)
4 Insert 5 Divided type 5A Cavity inner surface 6 Take-out rod 7 Lifting platform 17, 17C Locking collar 18, 18A Joint 19 Removal mechanism 21 Cavity inner surface 23 Shaft hole 31 Cavity inner surface 41 Cavity inner surface 43 Undercut formation Parts 44, 44A guide groove parts 45, 45C locking groove part 61 scooping part 63 turning drive mechanism C cavity D arrow L arrow P molded product P5E undercut part P5I undercut part S compression molding machine T1 dimension T2 dimension T3 dimension U arrow V Arrow

Claims (2)

A first mold body and a second mold body each having an inner surface capable of forming a cavity for molding a synthetic resin by closing the mold, and a part of the cavity are formed by being supported by the first mold body so as to be able to protrude and retract in the cavity. An insert having an undercut forming portion for forming an undercut portion of the molded product, and a shaft hole of the first mold body connected to the insert to take out the molded product at the time of mold release from the first mold body In a mold for resin molding provided with a take-out rod arranged so as to be freely accessible,
A plurality of pairs of the insert and the extraction rod are provided,
At least two nestings out of the plurality are arranged in different directions with different undercuts,
Each nest is connected freely to the tip of each take-out rod via a joint ,
The joint has a locking groove formed in the leading end of the take-out rod or insert extending in the undercut direction, and a tip formed on the tip of the insert or take-out rod. mold for resin molding which is characterized that you have a locking hook which is connected to and idler shape freely cut vent movement. A removal mechanism for removing the undercut forming portion of the insert from the molded product by pushing the molded product taken out from the first mold while being supported by the insert in the direction of the undercut is provided in the first mold. The mold for resin molding according to claim 1, wherein the mold is used.

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