JP5608378B2 - Mold and resin molding - Google Patents

Description

  The present invention relates to a molding die for molding a molding material filled in a molding space, and a resin molded product molded using the molding die.

  Conventionally, a molded product having a shape corresponding to the shape of the molding space is manufactured by filling the molding space formed in the molding die with a molding material and molding the molding material in the mold. For example, a molding space formed between a convex mold and a concave mold is filled with a resin material such as a resin material having fluidity or pre-expanded expandable resin particles (pre-expanded resin particles). A resin molded product is manufactured by in-mold molding.

  The molding die as described above includes a molding wall portion that forms a molding space, and the molding wall portion has an opening that passes through the molding wall portion and communicates with the molding space. The opening is configured such that a fitting member such as a material supply pipe that supplies a molding material (raw material) to the molding space or an extrusion unit that extrudes a molded product from the inside of the concave mold can be inserted. And it is comprised so that the opening part may be obstruct | occluded by the insertion member being inserted by the opening part, and the molding material with which the molding space was filled will not leak outside from an opening part.

  However, depending on the shape of the molded product (that is, the shape of the molding space), the opening and the molding space may be connected even when the fitting member is fitted into the opening. If the molding material is filled in the molding space in such a state, the molding material may enter the inside of the opening and a projection may be formed on the surface of the molded product. When such a protrusion is formed, it becomes difficult to laminate the molded product and the laminate without gaps when laminating a laminate material such as a skin material on the surface of the molded product, or the protrusion after lamination. There is a possibility that the laminated material may be peeled off from the molded product in the vicinity of.

  For this reason, in order to prevent the molding material from entering the opening, the tip of the insertion member with the opening closed is projected to the molding space side from the molding wall, and the molding material enters the opening. There is known a method for preventing the above (see Patent Document 1).

JP 59-1555017 A

  However, as shown to Fig.5 (a), the recessed part B1 opened in the direction which cross | intersects the mold release direction of the molded article M is formed in the front-end | tip part of the insertion member B inserted by the opening part 5. As shown in FIG. In this case, when the distal end portion of the fitting member B is protruded to the molding space side with respect to the molding wall portion 4, depending on the shape of the molded product M in the region where the opening 5 is formed, a concave portion is formed in the molding space. B1 is positioned, and the molding material M filled in the molding space may enter the concave portion B1.

  Moreover, as shown in FIG.5 (b), when the protrusion part B5 which protrudes in the direction which cross | intersects with respect to the mold release direction of the molded article M is formed in the front-end | tip part of fitting member B ', fitting insertion is carried out. When the tip end of the member B is projected to the molding space side from the molding wall 4, a gap is formed between the projection B 5 and the molding wall 4 depending on the shape of the molded product M in the region where the opening 5 is formed. B1 ′ may be formed, and the molding material M filled in the molding space may enter the gap B1 ′.

  If in-mold molding is performed in such a state, when the molded product M is moved in the mold release direction, it is difficult to remove the molded part in the concave portion B1 or the gap B1 ′. When the molded product M is released from the mold, such a portion of the molded product M may be damaged.

  On the other hand, as shown in FIG. 6A and FIG. 6B, the concave portion B1 and the gap B1 ′ are positioned inside the opening 5, thereby forming in the concave portion B1 and the gap B1 ′. Although the material M can be prevented from entering, the opening 5 may be connected to the molding space depending on the shape of the molding space. In such a case, as described above, the molding material M enters the opening 5 and the projection M1 is formed on the surface of the molded product M. For this reason, an operation such as removing the protrusion M1 to smooth the surface of the molded product may be necessary, which causes a reduction in production efficiency.

  Therefore, the present invention provides the concave portion and the protruding portion even when the insertion member is inserted into the opening so that the concave portion and the protruding portion are located on the molding space side of the molding wall portion. Mold that can prevent the molding material from entering the gap between the tip and the molding wall, and can prevent the molded product from being damaged when releasing the molded product It is an issue to provide. Another object of the present invention is to provide a resin molded product molded by the molding die.

The molding die according to the present invention includes a molding wall portion that forms a molding space filled with a molding material, and the molding wall portion has an opening that penetrates the molding wall portion and communicates with the molding space. And the opening is configured so that a fitting member formed with a recessed portion that is open in a direction intersecting with a mold release direction of a molded product molded in the molding space can be inserted. The molding wall portion includes an inclined wall portion formed so as to be inclined with respect to the releasing direction, and the opening portion is formed so as to penetrate the inclined wall portion along the releasing direction. , in a state where the fitting insertion member such that at least a portion of the concave portion is positioned in the molding space side than the inclined wall portion is fitted into the opening, closing portion for closing the recessed portion located on the molding space side this There are formed so as to protrude from the inclined wall portion along the penetrating direction of the opening The features.

The molding die according to the present invention includes a molding wall portion that forms a molding space filled with a molding material, and the molding wall portion has an opening that passes through the molding wall portion and communicates with the molding space. And the opening is configured so that a fitting member including a projecting portion projecting in a direction intersecting with a releasing direction of a molded product molded in the molding space can be inserted. The molding wall portion includes an inclined wall portion formed so as to be inclined with respect to the releasing direction, and the opening portion is formed so as to penetrate the inclined wall portion along the releasing direction. , closing the gap formed between the in a state where the protruding portion is the fitting insertion member so as to be positioned in the molding space side than the inclined wall portion is fitted into the opening, the projecting portion and the inclined wall portion closing portion is formed so as to protrude from the inclined wall portion along the penetrating direction of the opening And wherein the door.

According to such a configuration, since the concave portion and the gap between the protruding portion and the inclined wall portion are closed by the closing portion, it is possible to prevent the concave portion and the gap from continuing to the molding space. . For this reason, when the molding material is filled in the molding space, the molding material does not enter the concave portion or the gap, and the molding material can be prevented from being molded in the concave portion or the gap. Thereby, it is possible to prevent the undercut portion from being formed in the molded product due to the concave portion or the gap, and it is possible to prevent the molded product from being damaged when releasing the molded product. .

  In the molding die according to the present invention, it is preferable that the closing portion is integrally formed along the periphery of the opening.

  According to such a configuration, since the closing portion is integrally formed along the periphery of the opening, the closing portion becomes a wall shape along the periphery of the opening, so that the recessed portion and the gap can be closed. The range can be widened, for example, even when a plurality of concave portions are formed along the circumferential direction of the opening, or even when formed into a groove shape along the circumferential direction, the concave portion Can be occluded.

  Further, in the molding die according to the present invention, in a state where the insertion member is inserted into the opening, the closing portion is formed so as to protrude along the insertion member, and the distal end portion of the closing portion It is preferable that the distal end portion of the insertion member is located on the same plane orthogonal to the protruding direction of the closing portion.

  According to such a configuration, in a state where the insertion member is inserted into the opening, the blocking portion is formed so as to protrude along the insertion member, and the distal end portion of the blocking portion and the insertion member Is located on the same plane orthogonal to the protruding direction of the closing portion, so that the leading end portion of the closing portion and the leading end portion of the fitting member are in the protruding direction of the closing portion. Since no step is formed, a molded product with few corners can be obtained. The corner portion is a portion that is easily damaged when releasing a molded product or in a distribution process. For this reason, when performing in-mold forming, it is possible to prevent the molded product from being damaged by preventing the corner portion from being formed between the distal end portion of the closing portion and the distal end portion of the fitting member. .

Moreover, it is preferable that the molding die concerning this invention has the fillet part formed between the said obstruction | occlusion part and an inclination wall part .

According to such a configuration, since the fillets are formed between the blocking portion and the inclined wall portion, the molding space between the closed portion and the inclined wall portion is prevented from becoming pointed Can do. Thereby, it can prevent that a corner | angular part is shape | molded between an inclination wall part and a obstruction | occlusion part, and it can suppress that it becomes easy to damage a molded article.

  The resin molded product according to the present invention is characterized in that expandable resin particles are molded using the molding die described in any one of the above.

  As described above, according to the present invention, even if the insertion member is fitted into the opening so that the concave portion or the protruding portion is located on the molding space side of the molding wall portion, the concave portion In addition, the molding material can be prevented from entering the gap between the tip of the protruding portion and the molding wall, and the molded product can be prevented from being damaged when the molded product is released. Can do.

Sectional drawing of the shaping die of this embodiment. (A) is the expanded sectional view of the area | region in which the opening part in the shaping | molding wall part of this embodiment was formed, and the figure which showed the front end side of the fitting member, (b) is the opening part of this embodiment. The expanded sectional view of the area | region in which the opening part in the shaping | molding wall part at the time of the insertion member being inserted is formed. (A) is the expanded sectional view of the area | region in which the opening part in the shaping | molding wall part of this embodiment was formed, and the figure which showed the front end side of the other insertion member, (b) is the opening of this embodiment The expanded sectional view of the area | region in which the opening part in the shaping | molding wall part at the time of another insertion member being inserted by the part was formed. (A) is an expanded sectional view of the area | region in which the opening part in the shaping | molding wall part of other embodiment was formed, (b) is the area | region in which the opening part in the shaping | molding wall part of other embodiment was formed. FIG. The expanded sectional view of the area | region in which the opening part in the molding wall part of the conventional molding die was formed. The expanded sectional view of the area | region in which the opening part in the molding wall part of the conventional molding die was formed.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS.

  As shown in FIG. 1, the molding die 1 according to the present embodiment is configured to perform molding in a mold by filling a molding space A formed therein with a molding material. In the present embodiment, the molding die 1 is composed of a convex mold 2 and a concave mold 3, and the convex mold 2 and the concave mold in a state where the convex mold 2 and the concave mold 3 are combined (hereinafter referred to as a mold closed state). 3, the molding space A is formed. Further, the molding die 1 is arranged so that the convex mold 2 and the concave mold 3 face each other, and is configured so that the convex mold 2 and the concave mold 3 can be contacted and separated along the facing direction.

  The molding material filled in the molding space A is not particularly limited, but it is possible to use a material made of a material that is molded along the shape of the molding space A when it is molded in the mold. it can. For example, one obtained by pre-expanding a plurality of expandable resin particles (pre-expanded resin particles) is used. A plurality of the pre-expanded resin particles are filled in the molding space A and come into contact with high-temperature water vapor so that the pre-expanded resin particles expand and soften the surface, and the pre-expanded resin particles are connected to form a molded product. Has been.

  As the pre-expanded resin particles, thermoplastic resin particles are impregnated with a foaming agent to form expandable thermoplastic resin particles (expandable resin particles), and the expandable resin particles are pre-expanded by heating with water vapor or the like. Can be used. Examples of the thermoplastic resin particles include polystyrene resins, polyolefin resins (for example, polypropylene resins, polyethylene resins, etc.), or composite resins containing these. Furthermore, it may be made of a polyester resin (for example, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, etc.), a polycarbonate resin, a polylactic acid resin, or the like. In particular, it is preferable to use a composite resin including a polystyrene resin and a polyolefin resin.

  In addition to the pre-expanded resin particles, those obtained by heating a thermoplastic resin to have fluidity, liquid raw materials for synthesizing a polyurethane resin, and the like can be used.

  The molding die 1 includes a molding wall 4 that forms a molding space A. The molding wall 4 is composed of a convex molding wall 2 a formed on the convex 2 and a concave molding wall 3 a formed on the concave 3. The convex molding wall 2a is configured to close the opening of the concave molding wall 3a formed in a concave shape when the mold is closed. On the other hand, the concave molding wall portion 3a protrudes from the entire area of the opposing wall portion 3b formed to face the convex molding wall portion 2a with a space therebetween in the mold closed state, and the outer peripheral portion of the opposing wall portion 3b. The side wall 3c is formed toward the mold 2 side, and the opening of the concave molding wall 3a is formed at the tip of the side wall 3c (the end on the convex mold 2 side). The convex molding wall 2a closes the opening of the concave molding wall 3a, thereby forming a space surrounded by the convex molding wall 2a and the concave molding wall 3a. A.

  In addition, the molded product molded in the molding space A is released from the concave molding wall 3a toward the opening direction of the concave molding wall 3a. In the following description, the direction in which the molded product is released is referred to as the release direction.

  The molding wall 4 is formed with an opening 5 that penetrates the molding wall 4 and communicates with the molding space A. The opening 5 is formed so that the penetrating direction is inclined with respect to the molding wall 4 (not to make a right angle). The direction in which the opening 5 penetrates the molding wall 4 (hereinafter referred to as the penetration direction) is formed so as to be along the mold release direction.

That is, the molding wall 4 in which the opening 5 is formed is formed so as to be inclined at a predetermined angle with respect to the mold release direction of the molded product (so as not to be orthogonal). In this embodiment, the opening 5 is formed in the concave molding wall 3a (more specifically, the opposing wall 3b), and is formed so that the opposing wall 3b is inclined with respect to the mold release direction of the molded product. (Hereinafter, the opposing wall 3b is also referred to as an inclined wall 3b) .

  Further, the opening 5 is configured so that a fitting member B such as a material supply pipe for supplying a molding material to the molding space A or an extrusion means for extruding a molded product from the concave mold 3 can be inserted. Further, in the opening 5, the opening surface on the molding space A side of the molding wall portion 4 (specifically, the inclined wall portion 3 b) is sealed by the insertion member B in a state where the insertion member B is inserted. It is formed so that. Moreover, the opening part 5 is formed so that it may closely_contact | adhere to the outer peripheral surface of the state in which the insertion member B was inserted, and the insertion member B.

  Here, the insertion member B will be described. As shown in FIG. 2, the insertion member B used in the molding die 1 in the present embodiment has a cylindrical shape and is pre-foamed in the molding space A in a state of being inserted into the opening 5. A material supply pipe configured to be able to supply resin particles.

  Further, the insertion member B is configured such that the axial direction (longitudinal direction) is along the penetrating direction of the opening 5 in a state where the insertion member B is inserted into the opening 5. Further, the insertion member B is inserted into the opening 5 so that at least a part of one end portion (tip portion) is located on the molding space A side with respect to the molding wall portion 4. Further, a material supply means (not shown) for supplying a molding material is connected to the other end portion.

  Moreover, as shown to Fig.2 (a), the recessed part B1 opened toward the direction which cross | intersects with respect to an axial direction is formed in the insertion member B. As shown in FIG. The concave portion B1 is formed so as to open in a direction intersecting the mold release direction of the molded product (specifically, a direction substantially orthogonal) in a state where the insertion member B is inserted into the opening 5. ing. Further, the concave portion B1 is formed integrally (that is, in a groove shape) over the entire circumference in the circumferential direction of the distal end portion of the fitting member B.

  The fitting member B includes a tip surface B2 formed so as to be substantially orthogonal to the axial direction. That is, the front end surface B2 is formed so as to be substantially orthogonal to the mold release direction in a state where the insertion member B is inserted into the opening 5. That is, the tip surface B2 and the inclined wall portion 3b are configured not to be parallel. In addition, a material discharge port (not shown) through which the molding material is discharged is formed at a substantially central portion of the front end surface B2, and the material discharge port is sealed after the molding material is filled into the molding space. It is configured as follows.

  The said insertion member B is comprised from the front-end | tip part B3 and main-body part B4 which were formed in the cylinder shape (cylindrical shape). The tip B3 is configured to be detachable from the main body B4. Specifically, the tip B3 is composed of a large diameter portion and a small diameter portion, the tip surface B2 is formed at the end of the large diameter portion, and the small diameter portion can be fitted inside the main body B4. It is configured. On the other hand, the outer peripheral diameter of the main body part B4 is formed larger than the small diameter part of the tip part B3. Thereby, the recessed part B1 is formed in a groove shape between the large diameter part of the tip part B3 and the main body part B4. The tip B3 is in a state of being in contact with the molding material filled in the molding space A, and thus is easily soiled. When soiled, the tip B3 can be easily replaced with a new tip B3. ing.

  The molding wall portion 4 is formed in a state in which the insertion member B is inserted into the opening 5 so that at least a part of the concave portion B1 is positioned on the molding space A side with respect to the molding wall portion 4. 4 (specifically, the inclined wall portion 3b) is provided with a closing portion 4a formed so as to close the concave portion B1 located on the molding space A side.

  The closing portion 4 a is formed at the opening end of the molding wall 4 on the molding space A side. Specifically, the closing portion 4a is formed so as to protrude from the opening end portion on the molding space A side in the inclined wall portion 3b toward the center side of the molding space A. Further, the closing portion 4 a is formed so as to protrude along the direction of penetration of the opening 5. Further, the closing portion 4 a is formed so as to protrude along the fitting member B fitted into the opening 5.

  Further, the closing portion 4a is formed along the periphery of the opening 5 (specifically, integrally with substantially the entire periphery). That is, the blocking portion 4a is formed in a wall shape along the periphery of the opening 5, and the blocking portion opening 4c is formed by the distal end portion (end portion in the protruding direction) 4b of the blocking portion 4a. The closing part opening 4c is formed so that the center part is located on the axis along the penetrating direction of the opening 5. Further, the inner surface of the closing portion 4 a is formed along the penetrating direction of the opening 5 and is configured to be a surface continuous with the inner surface of the opening 5.

  Moreover, the said front-end | tip part 4b is formed on the same plane substantially orthogonal to the protrusion direction (namely, penetration direction of the opening part 5) of the obstruction | occlusion part 4a. That is, the opening surface of the closing portion opening 4c formed by the tip portion 4b is formed to be inclined at a predetermined angle with respect to the opening surface of the opening 5 on the molding space A side. Moreover, the said front-end | tip part 4b is comprised so that a level | step difference may not be formed between front-end | tip surfaces B2 of the insertion member B inserted by the opening part 5. As shown in FIG. In other words, the distal end portion 4b (opening surface of the closing portion opening 4c) and the distal end surface B2 of the fitting member B are configured to be on the same plane (so as to be flush with each other).

  The blocking portion 4a is formed such that the length (projection amount) h along the protruding direction between the tip portion 4b and the inclined wall portion 3b becomes gradually shorter (or longer) along the inclined wall portion 3b. ing. The length of the position where the protrusion amount h is maximum is preferably 8 to 12 mm. Moreover, in this embodiment, it is comprised so that the opening surface of the obstruction | occlusion part opening part 4c and the opening surface of the opening part 5 may contact | connect. That is, the protrusion amount h is configured to be zero at a position where the opening surface of the closing portion opening 4c and the opening surface of the opening 5 are in contact with each other.

  A fillet portion 4d is formed between the molding wall portion 4 and the closing portion 4a. The fillet portion 4d is formed such that a portion where the molding wall portion 4 and the blocking portion 4a intersect is thickened. In the present embodiment, the fillet portion 4d is formed so as to be thickened in an arc shape along the molding wall portion 4 and the base end portion of the closing portion 4a. When the fillet portion 4d is not formed, the region where the molding wall portion 4 and the blocking portion 4a intersect in the molding space A has a pointed shape, and is thus less likely to be filled with the molding material. On the other hand, since the fillet portion 4d is formed, the intersecting portion of the molding wall portion 4 and the blocking portion 4a does not have a pointed shape, and the molding material can be filled along the fillet portion 4d. Moreover, the strength of the base end portion of the closing portion 4a can be improved by forming the fillet portion 4d.

  Next, a state where the insertion member B is inserted into the opening 5 will be described. As shown in FIG. 2B, the fitting member B is fitted into the opening 5 along the direction of penetration of the opening 5. The insertion member B is inserted into the opening 5 so that at least a part of the concave portion B1 is located on the molding space A side with respect to the molding wall 4 (specifically, the inclined wall 3b).

  In this state, a part of the tip of the fitting member B protrudes from the molding wall 4 toward the molding space A, and the concave part B1 is partly closer to the molding space A than the inclined wall 3b. It is located and the other part is located inside the opening 5.

  Further, the insertion member B is inserted into the opening 5 so that no step is formed between the distal end B3 of the insertion member B and the distal end 4b of the closing portion 4a. Specifically, the insertion member B is fitted into the opening 5 so that the distal end surface B2 of the insertion member B and the opening of the closing portion opening 4c are located on the same plane (so as to be flush with each other). Inserted. Thereby, the whole area | region located in the shaping | molding space A side rather than the shaping | molding wall part 4 in the insertion member B will be located inside the obstruction | occlusion part 4a formed in wall shape.

  That is, the part located in the molding space A side rather than the molding wall part 4 in the recessed part B1 will be located inside the said obstruction | occlusion part 4a, and will be in the state obstruct | occluded by the obstruction | occlusion part 4a. Further, the concave portion B1 of the other part is located inside the opening 5 and is in a state of being closed by the opening 5. Thereby, the concave portion B1 and the molding space A are not connected to each other, and the molding material filled in the molding space A can be prevented from entering the concave portion B1.

  As described above, according to the molding die according to the present invention, even if the insertion member is inserted into the opening so that the concave portion is positioned in the molding space, the molding material is formed in the concave portion. Can be prevented, and when the molded product is released, the molded product can be prevented from being damaged.

  That is, even when the molding die 1 is inserted and inserted such that at least a part of the concave portion B1 of the insertion member B is positioned on the molding space A side with respect to the molding wall portion 4, the blocking portion 4a. As a result, the concave portion B1 is closed, so that the concave portion B1 is closed with respect to the molding space A. For this reason, when the molding material is filled in the molding space A, the molding material does not enter the concave portion B1, and the molding material can be prevented from being molded in the concave portion B1. Thereby, it can prevent that an undercut part will be formed in a molded article by the recessed part B1, and when releasing a molded article, it can prevent that a molded article will be damaged.

  Moreover, since the recessed part B1 becomes a wall shape along the periphery of the opening part 5 because the closing part 4a is integrally formed along the periphery of the opening part 5, the range which can close the recessed part B1 is provided. Even if it is the recessed part B1 formed in groove shape along the circumferential direction of the insertion member B, it can block | close reliably.

  Further, in a state where the insertion member B is inserted into the opening 5, the distal end portion 4 b of the closing portion 4 a (the opening surface of the closing portion opening portion 4 c) and the distal end portion of the insertion member B (specifically, the distal end) Since the surface B2) is located on the same plane orthogonal to the protruding direction of the closing portion 4a, no step is formed between the distal end portion 4b of the closing portion 4a and the distal end portion of the fitting member B. Therefore, the filling property of the molding material in the vicinity of the closing portion 4a is improved, and the molding material can be filled into the molding space A without a gap. Moreover, since a molded product with few corners can be obtained, it is possible to suppress the molded product from being easily damaged.

  Further, the fillet portion 4d is formed between the blocking portion 4a and the molding wall portion 4, thereby preventing the molding space A between the molding wall portion 4 and the blocking portion 4a from being pointed. be able to. As a result, the molding material can be filled without a gap between the molding wall 4 and the closing portion 4a, and the filling property of the molding material can be improved. Moreover, since it becomes a molded product with few corner | angular parts, it can suppress that a molded product becomes easy to break.

  The molding die according to the present invention is not limited to the above embodiment, and various modifications can be made without departing from the gist of the present invention.

  For example, instead of the insertion member B of the above embodiment, an insertion member B ′ having a different shape may be inserted into the opening 5. Specifically, as shown in FIG. 3, an insertion member B ′ including a protruding portion B <b> 5 that protrudes in a direction intersecting the mold release direction of the molded product may be used. More specifically, the insertion member B ′ includes a shaft part B6 formed so as to be along the penetrating direction of the opening 5 and a direction intersecting the shaft part B6 from the shaft part B6 (specifically, It is comprised from protrusion part B5 which protrudes in the direction orthogonally crossed. The protruding portion B5 is formed at the tip of the shaft portion B6, and is integrally formed over the entire outer periphery of the shaft portion B6. That is, the insertion member B 'is formed so that the cross-sectional shape is T-shaped.

  The fitting member B ′ as described above is configured to act as an extruding means for pushing the molded product out of the concave mold 3 when the molded product is released from the concave mold 3. Specifically, when the insertion member B ′ is relatively inserted in the direction in which the convex mold 2 and the concave mold 3 are separated in a state of being inserted into the opening 5, the insertion member B ′ is located inside the concave molding wall 3 a. It is comprised so that it may extend, and it is comprised so that the front-end | tip part of the said shaft part B6 and protrusion part B5 may contact | abut to a molded article, and a molded article may be extruded from the inner side of the concave molding wall part 3a.

  The fitting member B 'is fitted into the opening 5 so that the protruding portion B5 is positioned on the molding space A side with respect to the molding wall 4. At this time, the protruding portion B5 is positioned inside the closing portion 4a. Thereby, the gap generated between the protruding portion B5 and the molding wall portion 4 is closed by the closing portion 4a, and the molding material can be prevented from entering between the protruding portion B5 and the molding wall portion 4. it can. For this reason, an undercut part is not formed in a molded product by protrusion part B5, and it can prevent that a molded product is damaged when releasing a molded product.

  In addition, as the shape of the fitting member B ′, the protruding portion B5 is formed so as to be reduced in diameter along the longitudinal direction from the distal end portion of the fitting member B ′ (reverse taper shape) and has a substantially T-shaped cross section. It may be formed in a shape.

  Moreover, in the said embodiment, although it has comprised so that the opening surface of the obstruction | occlusion part opening part 4c and the opening surface of the opening part 5 may contact, it is not limited to this, As shown to Fig.4 (a) Alternatively, the opening surface of the closing portion opening 4c and the opening surface of the opening 5 may be formed in a separated state. In this case, the closing part 4a is formed along the entire circumference of the opening 5, and the periphery of the opening 5 is surrounded by the closing part 4a. By being configured in this manner, even when the entire concave portion B1 is located on the molding space A side with respect to the molding wall portion 4, the entire concave portion B1 can be closed with the closing portion 4a. .

  Moreover, in the said embodiment, although the penetration direction of the opening part 5 is comprised so that it may incline with respect to the shaping | molding wall part 4, it is not limited to this, As shown in FIG.4 (b), You may comprise so that the penetration direction of the opening part 5 may make a right angle with respect to the shaping | molding wall part 4. FIG. In this case, since the entire concave portion B1 is positioned on the molding space A side with respect to the molding wall portion 4, it is preferable that the closing portion 4a is formed along the entire circumference of the opening 5. Thereby, the whole recessed part B1 can be obstruct | occluded by the obstruction | occlusion part 4a.

  Moreover, in the said embodiment, although the recessed part B1 is integrally formed in groove shape along the circumferential direction of the fitting member B, it is not limited to this, A recessed part is formed intermittently. Alternatively, a part of the outer surface of the insertion member B may be formed in a concave shape.

  Moreover, in the said embodiment, although the opening part 5 is formed so that it may penetrate the inclination wall part 3b along an up-down direction, it is not limited to this, The penetration direction is a mold release direction of a molded article If it is a state along, it may be formed along the horizontal direction or other directions.

  DESCRIPTION OF SYMBOLS 1 ... Molding die, 2 ... Convex mold, 2a ... Convex molding wall part, 3 ... Concave mold, 3a ... Concave molding wall part, 3b ... Opposite wall part, inclined wall part, 3c ... Side wall part, 4 ... Molding wall part 4a ... occlusion part, 4d ... fillet part, 5 ... opening part, A ... molding space, B ... insertion member, B1 ... concave part

Claims (5)

A molding wall that forms a molding space filled with a molding material is provided, and the molding wall is formed with an opening that penetrates the molding wall and communicates with the molding space. In a molding die configured to be capable of inserting a fitting insertion member formed with a concave portion that opens in a direction intersecting with a mold release direction of a molded product molded in space,
The molding wall portion includes an inclined wall portion formed to be inclined with respect to the mold release direction, and the opening is formed to penetrate the inclined wall portion along the mold release direction, In the state in which the insertion member is fitted into the opening so that at least a part of the concave portion is located on the molding space side with respect to the inclined wall portion, a closing portion that closes the concave portion located on the molding space side A molding die which is formed so as to protrude from the inclined wall portion along the penetrating direction of the portion. A molding wall that forms a molding space filled with a molding material is provided, and the molding wall is formed with an opening that penetrates the molding wall and communicates with the molding space. In a molding die configured to be able to insert and insert an insertion member provided with a protruding portion protruding in a direction intersecting the mold release direction of a molded product molded in space,
The molding wall portion includes an inclined wall portion formed to be inclined with respect to the mold release direction, and the opening is formed to penetrate the inclined wall portion along the mold release direction, in a state where the protruding portion is the fitting insertion member so as to be positioned in the molding space side than the inclined wall portion is fitted into the opening to close the gap formed between the inclined wall portion and the projecting portion closed The molding die is characterized in that the portion is formed so as to protrude from the inclined wall portion along the penetrating direction of the opening .   The molding die according to claim 1, wherein the closing portion is integrally formed along a peripheral edge of the opening.   In a state where the insertion member is inserted into the opening, the closing portion is formed so as to protrude along the insertion member, and the distal end portion of the closing portion and the distal end portion of the insertion member are The molding die according to any one of claims 1 to 3, wherein the molding die is located on the same plane orthogonal to the protruding direction. The molding die according to any one of claims 1 to 4, wherein a fillet portion is formed between the closed portion and the inclined wall portion .

Images