JP5402280B2 - Mold for foam molding - Google Patents

Description

  The present invention relates to a foam molding die (hereinafter sometimes abbreviated as a die) for integrally molding a molded product body having a through hole and an insert material having an opening overlapping the through hole.

I: An impact energy absorbing material (hereinafter abbreviated as EA material) made of hard urethane foam is attached to a door trim of an automobile for energy absorption (EA) at the time of a side collision (side collision). May be. As a method of attaching the EA material to the door trim, as shown in FIG. 9, a through hole (attachment hole) 4 is provided in the EA material 3, and the rod 2 protruding from the inner surface of the door trim 1 is inserted into the through hole 4. There is a method in which a flat washer 5 is fitted to the rod 2 and then the leading end side of the rod 2 is crimped to form an enlarged portion 2a (paragraphs 0002 to 0003 of JP-A-2001-322507). FIG. 9 (b) is an enlarged view of portion B in FIG. 9 (a).

  In order to mold an EA material made of rigid urethane foam having such a through hole 4, a convex part having a shape of the through hole 4 is provided on an upper mold or a lower mold (usually an upper mold).

  In Japanese Patent Application Laid-Open No. 2008-68581, a through hole-shaped convex portion for forming a through hole in a molded product protrudes from one cavity inner surface of an upper mold and a lower mold, and the tip surface of the convex section In the foam molding die that abuts against the convex portion opposing portion of the inner surface of the other cavity of the upper die and the lower die, the convex portion opposing portion is elastically retracted when the convex portion and the convex portion opposing portion are in contact with each other. A foam molding die configured as described above is described. The convex portion facing portion protrudes slightly from the inner surface of the cavity when the mold is open. In this foam molding die, the convex portion is pressed against the convex portion-facing portion, the convex portion-facing portion is slightly retracted, and the upper mold and the lower mold are clamped so as to be in close contact with each other. be able to. Thereby, a thin skin-like burr is not generated at the bottom of the through hole, and the upper mold and the lower mold are tightly clamped, and the occurrence of a burr on the parting line is prevented.

  As shown in FIG. 9, instead of providing a flat washer 5 between the enlarged portion 2a of the rod 2 and the EA material 3, a reinforcing insert material made of a hard material such as metal or synthetic resin is provided around the through hole 4. It may be provided on the surface of the EA material. This insert material has an opening overlapping the through hole 4. At the time of mold clamping, the insert material is disposed between the convex portion and the convex portion-facing portion so that the opening overlaps the tip surface of the convex portion.

II: When molding rigid polyurethane foam, supply the urethane raw material liquid into the lower mold of the upper and lower molds, mold and foam, solidify (cure), open the mold and demold I do.

  As a method for efficiently performing this demolding, JP-A-9-234748 and JP-A-2004-130629 arrange a film along the cavity surface of the lower mold, and the film and cavity are used for demolding after mold opening. A method is described in which air is supplied to the surface to separate the film from the cavity surface, and the molded product is pushed up and taken out by the film.

JP 2001-322507 A JP 2008-68581 A JP-A-9-234748 JP2004-130629

  In the above-mentioned Japanese Patent Application Laid-Open No. 2008-68581, when an insert material for reinforcing the outer surface of a molded product around a through hole is integrally formed with a molded product body, the insert material is disposed when the insert material is placed in a mold. It is not easy to position the insert material so that the opening overlaps the tip of the convex part for forming the through-hole and the convex part opposing part of the mold. If the opening of the insert material deviates from between the front end surfaces of the convex part and the convex part opposite part, there is a possibility that the foaming raw material enters the opening at the time of foam molding.

  The present invention is a foam molding die for integrally molding a molded product body having a through hole and an insert material having an opening overlapping the through hole, and positioning the insert material easily and accurately. An object of the present invention is to provide a mold for foam molding that can be performed and that prevents foaming raw material from entering the opening of the insert material during foam molding.

The foam molding die of the present invention (Claim 1) is a foam molding die for integrally molding a molded product body having a through hole and an insert material having an opening overlapping the through hole. The mold has an upper mold and a lower mold, and the first convex part of the through-hole shape for forming a through-hole in the molded product protrudes from the inner surface of one cavity of the upper mold and the lower mold. A second convex portion is projected from the inner surface of the other cavity of the upper die and the lower die so as to face the first convex portion, and the upper die and the lower die are When tightened, the tip surfaces of the first convex portion and the second convex portion are in contact with the insert material, respectively, and the second convex portion is pushed by the first convex portion and the insert material. In the foam molding die that is elastically retractable, an insert material is formed on one end surface of the first convex portion and the second convex portion. Mouth and protrusion engageable is provided, characterized in that the said one of the convex portions of the first and second protrusions, a magnet for attracting holding the insert member by a magnetic force is provided It is what.

According to a second aspect of the present invention, there is provided a foam molding die according to the first aspect , wherein a film is superimposed on a cavity surface of the lower mold, and a gas is sent to the lower mold to raise the film. it is characterized in that the gas supply for are al provided.

According to a third aspect of the present invention, there is provided the mold for foam molding according to the second aspect , wherein the first convex portion is provided on the upper die, the second convex portion is provided on the lower die, and the protruding portion is It protrudes from the front end surface of the 2nd convex part, and this 2nd convex part and protrusion part are covered with the said film, It is characterized by the above-mentioned .

The foam molding die of the present invention ( Claim 4 ) is a foam molding die for integrally molding a molded product body having a through hole and an insert material having an opening overlapping the through hole. The mold has an upper mold and a lower mold, and the first convex part of the through-hole shape for forming a through-hole in the molded product protrudes from the inner surface of one cavity of the upper mold and the lower mold. A second convex portion is projected from the inner surface of the other cavity of the upper die and the lower die so as to face the first convex portion, and the upper die and the lower die are When tightened, the tip surfaces of the first convex portion and the second convex portion are in contact with the insert material, respectively, and the second convex portion is pushed by the first convex portion and the insert material. In the foam molding die that is elastically retractable, an insert material is formed on one end surface of the first convex portion and the second convex portion. A foam molding die provided with a projecting portion engageable with an opening, wherein a film is superimposed on a cavity surface of the lower die, and a gas is supplied to the lower die under the film. A gas supply part is provided for feeding and floating the film, the first convex part is provided in the upper mold, the second convex part is provided in the lower mold, and the projecting part is It protrudes from the front end surface of this 2nd convex part, and this 2nd convex part and protrusion part are covered with this film, It is characterized by the above-mentioned.

The foam molding die according to claim 5 is characterized in that, in claim 4 , a magnet for attracting and holding the insert material by magnetic force is provided on the second convex portion .

According to a sixth aspect of the present invention, there is provided a foam molding die according to any one of the second to fifth aspects, wherein the protrusion has a curved outer surface on the front end side .

A foam molding die according to a seventh aspect of the present invention is the mold according to any one of the first to sixth aspects, wherein the tip surfaces of the first convex portion and the second convex portion are respectively from the opening of the insert material over the entire circumference. Further, the projecting portion is arranged to be separated from the peripheral portion of the tip surface toward the center side of the tip surface .
The foam molding die according to claim 8 is the mold according to any one of claims 1 to 7, wherein the distal end side of the projecting portion is engaged with the other distal end surface of the first convex portion and the second convex portion. A possible recess is provided.

  In the mold for foam molding of the present invention, it is possible to engage with the opening of the insert material on the tip surface of the first convex portion or the second convex portion protruding from the inner surface of the cavity of the upper die or the lower die. A protruding portion is provided. In foam molding, when the insert material is disposed in the cavity, the protrusion is engaged with the opening of the insert material. Thereby, positioning of this insert material can be performed easily and accurately so that the through hole of the molded product and the opening of the insert material overlap. This also prevents the insert material from moving in the direction intersecting the axial center line of the through-hole as the foaming material flows in the cavity during foam molding.

  Further, in the present invention, when the upper die and the lower die are clamped, the second convex portion is pushed by the first convex portion and the insert material and elastically retracts. That is, in this mold-clamped state, the tip surface of the second convex portion is elastically pressed against the insert material, and the insert material is pressed against the second convex portion to cause the tip surface of the first convex portion. It is pressed against. For this reason, the positioning accuracy of the insert material in the axial direction of the through hole of the molded product is high, and the insert material is also prevented from being displaced in the axial direction during foam molding. Further, it is also possible to prevent the foaming raw material from entering the opening of the insert material between the first convex portion and the insert material and between the second convex portion and the insert material at the time of foam molding. Thereby, it is prevented that burrs are generated in the through hole of the molded product body and the opening of the insert material formed by the mold.

As described in claim 7 , the tip surfaces of the first and second projections are each larger in diameter than the opening of the insert material over the entire circumference, and the projecting portion is a peripheral portion of the tip surface. It is preferable that it is spaced apart from the center side of the tip surface. By comprising in this way, when a protrusion part is made to engage with opening of insert material, the part of the outer peripheral side rather than this protrusion part is provided among the front-end | tip surfaces of this 1st convex part or a 2nd convex part. It can be made to contact | abut over the perimeter of the opening edge part of insert material. Moreover, at the time of mold clamping, the 2nd convex part or the front-end | tip surface of a 1st convex part can be made to contact | abut to the opening peripheral part of an insert material over a perimeter also on the opposite side. As a result, the opening of the insert material is blocked by the tip surfaces of the first and second convex portions over the entire circumference, so that the foaming raw material is prevented from entering the opening during foam molding.

In the aspect of Claim 8, the recessed part which can engage the front end side of this protrusion part is provided in the front end surface of the 1st convex part or the 2nd convex part in which the protrusion part is not provided. Engagement of the leading end side of the protruding portion with the concave portion makes it difficult for the foaming raw material to enter between the protruding portion and the leading end surface of the first convex portion or the second convex portion.

In the embodiment of claim 1, 5, the first protrusion or the second protrusion protruding portion is provided, a magnet for attracting held by the magnetic force is provided an insert material. By attracting and holding the insert material to the first convex portion or the second convex portion by this magnet, the insert material is further less likely to shift during foam molding.

According to the second and fourth aspects, the film is disposed along the cavity surface of the lower mold, and when removing the mold after opening the mold, air is supplied between the film and the cavity surface to cavitate the film. It can be separated from the surface, and the molded product can be pushed up by the film and taken out. Thereby, the demolding of a molded product can be performed efficiently.

In the third and fourth aspects, the first convex portion is provided on the upper die, the second convex portion is provided on the lower die, and the protruding portion protrudes from the tip surface of the second convex portion. The second protrusions and protrusions are covered with a film. When the insert material is installed in the cavity, the protruding portion is inserted into the opening of the insert material through this film. Therefore, in the clamped state, the film is interposed between the tip surface of the second convex portion and the insert material, and between the outer surface of the protruding portion and the inner peripheral surface of the opening of the insert material. It is possible to more effectively prevent the foaming raw material from entering between.

In the aspect of Claim 6 , the protrusion part has the shape where the outer surface of the front end side curved. Therefore, the film is prevented from being torn when the protruding portion is inserted into the opening of the insert material through the film.

It is a longitudinal cross-sectional view of the metal mold | die for foam molding which concerns on embodiment. FIG. 2 is an exploded longitudinal sectional view of the vicinity of a first protrusion and a second protrusion of the mold of FIG. 1. It is a longitudinal cross-sectional view of the same part as FIG. 2 which shows the state which has arrange | positioned the insert material in a lower mold | type. It is a longitudinal cross-sectional view of the same part as FIG. 2 after mold clamping. It is a disassembled perspective view of the 1st convex part and 2nd convex part vicinity of the metal mold | die of FIG. It is a longitudinal cross-sectional view at the time of foam molding using the metal mold | die of FIG. It is a longitudinal cross-sectional view at the time of demolding of the molded product shape | molded using the metal mold | die of FIG. It is a longitudinal cross-sectional view which shows another structural example of a 2nd convex part. It is sectional drawing which shows EA material and its attachment structure.

  Hereinafter, embodiments will be described with reference to the drawings. In the following embodiments, urethane is used as the foamed resin, and an EA material to be attached to the door trim of the automobile is manufactured. However, the present invention is a foam molded article made of a foamed resin material other than urethane, or EA. The present invention can also be applied to a molding die for foamed molded products other than materials.

  FIG. 1 is a longitudinal sectional view of a foam molding die according to an embodiment. FIG. 2 is an exploded longitudinal sectional view of the vicinity of the first convex portion and the second convex portion of the mold. FIG. 3 is a longitudinal sectional view of the same portion as FIG. 2, showing a state in which the insert material is disposed in the lower mold. FIG. 4 is a longitudinal sectional view of the same part as FIG. 2 after clamping. FIG. 5 is an exploded perspective view of the vicinity of the first convex portion and the second convex portion of the mold. FIG. 6 is a longitudinal sectional view at the time of foam molding using this mold. FIG. 7 is a longitudinal sectional view of a molded product molded using this mold at the time of demolding.

  The mold 21 includes a lower mold 22 and an upper mold 23, and the lower mold 22 is provided with a cavity 24 made of a recess.

  In this embodiment, the film 30 is provided along the cavity surface of the lower mold 22, and blowing means for blowing gas (preferably air) is provided between the film 30 and the cavity surface.

  The blowing means includes a chamber 32 formed by attaching an outer case 31 to the lower surface of the lower mold 22, an air blowing hole 33 that communicates the chamber 32 and the cavity surface, and an air supply / exhaust port 34 into the chamber 32. It is comprised by the pump and valve (not shown) which supply and discharge air via.

  The peripheral edge of the film 30 is superimposed on the mating surface PL of the lower mold 22 and is supported on the mating surface PL by a packing and a pressing member (not shown).

  In this embodiment, the molded product 40 molded by the mold 21 is an EA material made of rigid urethane foam attached to a door trim of an automobile. As shown in FIGS. 6 and 7, the molded product 40 includes a disc-shaped main body 41, a mounting portion 42 protruding in an ear shape from the main body 41, and a through-hole 43 provided in the mounting portion 42. And have. The upper surface side of the molded product 40 in FIGS. 6 and 7 is the opposite surface to the door trim. When the molded product 40 is attached to the door trim, the lower surface side of the molded product 40 in FIGS. Confront car occupants. Hereinafter, the upper and lower surfaces of the molded product 40 refer to the upper and lower surfaces in FIGS. 6 and 7, and the thickness direction refers to the vertical direction in FIGS. The attachment portion 42 protrudes laterally from the side surface of the main body portion 41 so as to be substantially flush with the upper surface of the main body portion 41. The thickness of the attachment portion 42 is smaller than the thickness of the main body portion 41. The through hole 43 penetrates the attachment portion 42 in the thickness direction. In addition, the shape of the molded product 40 is not limited to this.

  An insert material 44 is embedded in the molded product 40. In this embodiment, the insert material 44 includes a pressure receiving piece 44 a extending along the lower surface of the main body portion 41, a standing piece 44 b rising from the pressure receiving piece 44 a to the upper surface side of the main body portion 41, and the standing piece. There is an attachment portion reinforcing piece 44c that extends from the upper end side of 44b to the side along the lower surface of the attachment portion 42 to reinforce the attachment portion 42. The pressure receiving piece 44 a extends over substantially the entire lower surface of the main body 41. The attachment portion reinforcing piece 44 c is exposed on the lower surface of the attachment portion 42. The attachment portion reinforcing piece 44c is provided with an opening 45 that overlaps with the through hole 43 of the attachment portion 42 in a substantially coaxial manner. When the molded product 40 is attached to the door trim, for example, as shown in FIG. 9, the rod 2 protruding from the inner surface of the door trim 1 is inserted into the through hole 43 and the opening 45, and the tip side of the rod 2 is crimped. Thus, the enlarged portion 2a is formed. When the enlarged portion 2a is engaged with the peripheral portion of the opening 45 of the attachment portion reinforcing piece 44c, the molded product 40 is fixed to the door trim 1. In addition, the attachment method to the door trim of the molded article 40 is not limited to this. In a state where the molded product 40 is attached to the door trim of the automobile, when the occupant comes into contact with the main body 41 during a side collision or the like, the load is distributed over a wide range of the main body 41 by the pressure receiving pieces 44a. The insert material 44 is integrated with the rigid urethane foam forming the main body portion 41 and the attachment portion 42 by being set in the cavity 24 in advance when the molded product 40 is foam-molded. In this embodiment, the insert material 44 is made of a magnetic material such as iron that can be attracted to a magnet 54 described later. In addition, the structure and material of the insert material 44 are not limited to this.

  In order to form the attachment portion 42 of the molded product 40, the cavity 24 includes an overhang portion 24A. The overhanging portion 24A has a shape formed by partially denting the mating surface PL of the lower mold 22.

  Further, in order to form the through hole 43, a substantially cylindrical first convex portion 25 is projected from the upper mold 23. The first convex portion 25 protrudes into the overhang portion 24A. The protruding length of the first convex portion 25 from the cavity surface of the upper mold 23 is the lower end surface (tip surface) of the first convex portion 25 in a state where the upper mold 23 and the lower mold 22 are clamped. And the bottom surface of the overhanging portion 24 </ b> A have a size that is equal to or slightly larger than the thickness of the mounting portion reinforcing piece 44 c (for example, about 0.1 to 0.5 mm). The first convex portion 25 has a tapered shape with a diameter decreasing toward the lower end side in consideration of ease of extraction from the through hole 43 during demolding. The diameter of the lower end surface of the first convex portion 25 is larger than the diameter of the opening 45 of the attachment portion reinforcing piece 44c. On the lower end surface of the first convex portion 25, a concave portion 25a is formed that can be engaged with a tip end side of a protruding portion 27 described later. In this embodiment, the recess 25 a is a substantially hemispherical recess having substantially the same diameter as the opening 45, and the center thereof is disposed so as to substantially coincide with the axis of the first protrusion 25. A portion of the lower end surface of the first convex portion 25 on the outer peripheral side with respect to the concave portion 25a is a substantially horizontal flat surface that can be in close contact with the peripheral portion of the opening 45 on the upper surface of the attachment portion reinforcing piece 44c. In addition, the shape and arrangement | positioning of the 1st convex part 25 and the recessed part 25a are not limited to this.

  A second convex portion 26 protrudes from the bottom surface of the overhang portion 24 </ b> A so as to face the first convex portion 25. The second convex portion 26 is formed when the mounting portion reinforcing piece 44c is disposed between the convex portions 25 and 26 and the upper mold 23 and the lower mold 22 are clamped. And it is comprised so that it can be elastically retracted by being pushed by the attachment part reinforcement piece 44c. From the upper end surface (tip surface) of the second convex portion 26, a projecting portion 27 that can be engaged with the opening 45 of the attachment portion reinforcing piece 44c is provided. The structure of the 2nd convex part 26 and the protrusion part 27 in this embodiment is demonstrated in detail below.

  A hole 50 that penetrates the lower mold 22 is provided on the bottom surface of the overhang portion 24A. The hole 50 is disposed substantially coaxially with the first convex portion 25. A piston rod-shaped insertion body 51 is inserted into the hole 50. A coil spring 52 as an urging member that urges the insertion body 51 toward the inside of the cavity 24 is disposed below the insertion body 51. The lower end of the hole 50 is closed by a plug 53, and the coil spring 52 is disposed between the plug 53 and the insertion body 51 in a stored state (compressed state).

  The hole 50 includes a small diameter portion 50 a on the cavity 24 side and a large diameter portion 50 b on the outer surface side of the lower mold 22. The insertion body 51 includes a small diameter portion 51a and a large diameter portion 51b. The small diameter portion 51a is disposed in the small diameter portion 50a of the hole 50, and the large diameter portion 51b is disposed in the large diameter portion 50b of the hole 50. ing. The diameter of the small diameter part 51a of this insertion body 51 is larger than the diameter of the opening 45 of the attachment part reinforcement piece 44c. As shown in FIGS. 2, 3, and 7, when the mold 21 is in the mold open state, the large diameter portion 51b of the insert 51 is coil spring on the step surface between the small diameter portion 50a and the large diameter portion 50b of the hole 50. It is pressed by 52. In this state, the upper end portion of the small diameter portion 51a of the insertion body 51 slightly protrudes into the cavity (for example, about 0.5 to 1.0 mm) from the bottom surface of the overhang portion 24A. In other words, the upper end portion of the small diameter portion 51 a of the insertion body 51 constitutes the second convex portion 26.

  As shown in FIG. 4, when the mounting portion reinforcing piece 44c is disposed between the first convex portion 25 and the small diameter portion 51a and the upper die 23 and the lower die 22 are clamped, the first convex portion 25 is in contact with the upper surface of the attachment portion reinforcing piece 44c, the upper end surface of the small diameter portion 51a is in contact with the lower surface of the attachment portion reinforcing piece 44c through the film 30, and the small diameter portion 51a is the first diameter portion 51a. It is pushed by the convex portion 25 and the attachment portion reinforcing piece 44 c and elastically retracts into the hole 50. As shown in FIG. 4, in this clamped state, the small-diameter portion 51a has an upper end surface that is substantially flush with the bottom surface of the overhanging portion 24A or a state in which the small-diameter portion 51a protrudes slightly from the bottom surface. Retreat to the position.

  From the upper end surface of the small-diameter portion 51a, the projecting portion 27 having a substantially cylindrical projection shape having a smaller diameter than the small-diameter portion 51a is provided. In this embodiment, the projecting portion 27 is arranged substantially coaxially with the small diameter portion 51a. The radius of the projecting portion 27 is equal to or slightly smaller than the value obtained by subtracting the thickness of the film 30 from the radius of the opening 45 of the attachment portion reinforcing piece 44c. That is, as shown in FIGS. 3 and 4, the protrusion 27 can be inserted into the opening 45 through the film 30, and by inserting the protrusion 27 into the opening 45 through the film 30 in this way, The space between the outer peripheral surface of the protrusion 27 and the inner peripheral surface of the opening 45 is substantially sealed by the film 30. In this embodiment, the outer surface on the distal end side of the projecting portion 27 has a substantially hemispherically curved shape. This prevents the film 30 from being torn when the protruding portion 27 is inserted into the opening 45 from the lower side of the film 30. The protruding length of the protruding portion 27 from the upper end surface of the small diameter portion 51a is larger than the thickness of the attachment portion reinforcing piece 44c. As shown in FIG. 4, when the upper mold 23 and the lower mold 22 are clamped, the tip end side of the projecting portion 27 projects to the upper surface side of the attachment portion reinforcing piece 44c, and It engages with the recess 25a on the end face through the film 30 almost tightly. In addition, the shape and arrangement | positioning of the protrusion part 27 are not limited to this. For example, the tip end side of the protruding portion 27 may have a substantially trapezoidal shape with rounded corners. In the present invention, the fact that the outer surface on the distal end side of the projecting portion 27 is curved or rounded means that the curvature radius is 1 mm or more, for example, about 6 to 8 mm.

  A portion of the upper end surface of the small-diameter portion 51a on the outer peripheral side of the protruding portion 27 is a substantially horizontal flat surface that can be in close contact with the peripheral portion of the opening 45 on the lower surface of the attachment portion reinforcing piece 44c via the film 30. It has become. In this embodiment, as shown in FIGS. 2 to 5, an annular magnet 54 is attached to the upper end portion of the small diameter portion 51 a so as to surround the protruding portion 27. The magnet 54 attracts and holds the attachment portion reinforcing piece 44c to the upper end surface of the small diameter portion 51a. The shape and arrangement of the magnet 54 are not limited to this. For example, magnetism may be imparted to the entire insertion body 51. Further, the magnet 54 may be omitted. In FIGS. 1, 6, and 7, the magnet 54 is not shown.

  In addition, the structure of the 2nd convex part 26 and the protrusion part 27 is not limited to this.

  The molding procedure of the molded product 40 using the mold 21 configured as described above is as follows. First, as shown in FIGS. 1 to 4, the film 30 is brought into close contact with the cavity surface. Next, as shown in FIG. 3, the insert material 44 is installed in the cavity 24 of the lower mold 22, and the protruding portion 27 is inserted through the film 30 into the opening 45 of the attachment portion reinforcing piece 44 c. At this time, the attachment portion reinforcing piece 44 c is attracted by the magnet 54 and is in close contact with the upper end surface of the second convex portion 26 via the film 30. Thereafter, a urethane raw material is injected into the cavity 24 and the upper mold 23 and the lower mold 22 are clamped. At this time, as shown in FIG. 4, the first convex portion 25 comes into contact with the upper surface of the attachment portion reinforcing piece 44c, and the second convex portion 26 is pushed by the first convex portion 25 and the attachment portion reinforcing piece 44c. Retreat elastically. Thereafter, the urethane raw material is heated and foamed. In removing the mold, after opening the mold, air is blown into the chamber 32, and the film 30 is pushed up as shown in FIG.

  In the mold 21, as described above, the protrusion 27 protruding from the upper end surface of the second protrusion 26 is engaged with the opening 45 of the mounting portion reinforcing piece 44 c, thereby allowing the through hole of the molded product 40 to be engaged. The insert material 44 can be easily and accurately positioned so that the opening 43 of the attachment portion reinforcing piece 44c and the opening 43 overlap each other. This also prevents the insert material 44 from moving in the direction intersecting the axis of the through-hole 43 as the urethane raw material flows in the cavity 24 during foam molding. In this embodiment, since the attachment portion reinforcing piece 44c is attracted and held to the upper end surface of the second convex portion 26 by the magnet 54, the effect of preventing the displacement of the insert material 44 is high.

  In the clamped state, the upper end surface of the second convex portion 26 is pressed against the lower surface of the mounting portion reinforcing piece 44c through the film 30 by the urging force from the coil spring 52, and the mounting portion reinforcing piece 44c is It is urged upward, and the upper surface of the attachment portion reinforcing piece 44 c is pressed against the lower end surface of the first convex portion 25. Therefore, the positioning accuracy of the insert material 44 in the axial direction of the through hole 43 of the molded product 40 is high, and the insert material 44 is also prevented from being displaced in the axial direction during foam molding. Further, the urethane raw material is prevented from entering the opening 45 between the first convex portion 25 and the mounting portion reinforcing piece 44c and between the second convex portion 26 and the mounting portion reinforcing piece 44c during foam molding. Is done. As a result, no or almost no burrs are generated in the through-holes 43 and the openings 45 of the molded product 40 immediately after demolding, and the molded product 40 can be made EA without performing any deburring operation or simply. It can be a lumber product.

  In this embodiment, the lower end surface of the first projecting portion 25 and the upper end surface of the second projecting portion 26 are each larger in diameter than the opening 45 of the attachment portion reinforcing piece 44c. The second convex portion 26 is disposed substantially at the center. Therefore, when the protruding portion 27 is engaged with the opening 45 of the attachment portion reinforcing piece 44c, a portion of the distal end surface of the second convex portion 26 on the outer peripheral side of the protruding portion 27 is the attachment portion reinforcing piece 44c. It contacts the entire periphery of the periphery of the opening 45 on the lower surface. Further, at the time of mold clamping, on the opposite side, the front end surface of the first convex portion 25 contacts the peripheral edge portion of the opening 45 on the upper surface of the attachment portion reinforcing piece 44c over the entire circumference. As a result, the opening 45 is blocked by the tip surfaces of the first and second convex portions 25 and 26 over the entire circumference, so that urethane raw material is prevented from entering the opening 45 during foam molding.

  In this embodiment, a film 30 that covers the inner surface of the cavity 24 is provided, and this film 30 is provided between the upper end surface of the second convex portion 26 and the lower surface of the attachment portion reinforcing piece 44c, and of the protruding portion 27. Since it is interposed between the outer peripheral surface and the inner peripheral surface of the opening 45 and the recess 25a, foaming is coupled with the fact that the upper end surface of the second convex portion 26 is pressed against the lower surface of the attachment portion reinforcing piece 44c. It is possible to effectively prevent the urethane raw material from entering between them during molding.

  In this embodiment, in the mold-clamping state, the leading end side of the projecting portion 27 is engaged with the concave portion 25 a on the lower end surface of the first convex portion 25 via the film 30. As a result, the urethane raw material is also prevented from entering between the projecting portion 27 and the tip surface of the first convex portion 25.

[Another configuration example of the second convex portion 26]
In the above embodiment, the second convex portion 26 is constituted by the piston rod-shaped insertion body 51 urged toward the cavity 24 by the coil spring 52. The configuration is not limited to this. FIG. 8 is a longitudinal sectional view showing another configuration example of the second convex portion.

  In the embodiment of FIG. 8, a concave hole 80 is provided on the bottom surface of the overhanging portion 24A of the cavity 24 so as to be coaxial with the first convex portion 25, and an elastic body 81 such as rubber or urethane is provided in the concave hole 80. A front end of the elastic body 81 is protruded into the overhanging portion 24A. That is, in this embodiment, the upper end portion of the elastic body 81 is the second convex portion 26. A protruding portion 27 protrudes from the upper end surface of the elastic body 81.

  The other configuration of the mold 21 in this embodiment is the same as that of the above-described embodiment shown in FIGS. 1 to 7. In FIG. 8, the same reference numerals as those in FIGS. 1 to 7 denote the same parts. The molding procedure of the molded product 40 in this embodiment is also the same as that in the embodiment shown in FIGS.

  In this embodiment, at the time of clamping, the elastic body 81 is elastically deformed so as to be crushed by the first convex portion 25 and the attachment portion reinforcing piece 44c.

  In FIG. 8, the protruding portion 27 is shown as being formed integrally with the elastic body 81. However, for example, the protruding portion 27 is made of a hard material different from that of the elastic body 81, and insert molding or the like is performed. The elastic body 81 may be integrated.

[Other configurations]
In each of the embodiments described above, the protrusions 27 are provided on the second protrusions 26, but the protrusions 27 protrude from the lower end surface of the first protrusions 25 and the second protrusions 26 You may provide the recessed part 25a which the front end side of this protrusion part 27 engages in an upper end surface.

  In each of the above embodiments, the upper mold 23 is provided with the first convex portion 25, and the lower mold 22 is provided with the second convex portion 26, but the lower mold 22 is provided with the first convex portion 25, A second convex portion 26 may be provided on the upper mold 23.

  Each of the above configurations is an example of the present invention, and the present invention may have configurations other than those described above.

21 Mold 22 Lower mold 23 Upper mold 24 Cavity 25 1st convex part 25a Concave part 26 2nd convex part 27 Projection part 30 Film 40 Molded product 41 Main body part 42 Mounting part 43 Through-hole 44 Insert material 44a Pressure receiving piece 44b Standing up Piece 44c Mounting portion reinforcing piece 45 Opening 50 Hole 51 Insert body 52 Coil spring 54 Magnet 80 Recessed hole 81 Elastic body

Claims (8)

A foam molding die for integrally molding a molded product body having a through hole and an insert material having an opening overlapping the through hole,
The mold has an upper mold and a lower mold,
The first convex part of the through hole shape for forming a through hole in the molded product is projected from one cavity inner surface of the upper mold and the lower mold,
A second convex portion protrudes from the inner surface of the other cavity of the upper die and the lower die so as to face the first convex portion,
When the upper mold and the lower mold are clamped, the tip surfaces of the first convex portion and the second convex portion are in contact with the insert material, respectively, and the second convex portion is the first convex portion. In the mold for foam molding that is pushed by the convex part and the insert material and is elastically retractable,
A protrusion that can be engaged with the opening of the insert material is provided on one end face of the first and second protrusions ,
A foam molding die , wherein a magnet for attracting and holding an insert material by magnetic force is provided on one of the first and second convex portions . Oite to claim 1, which films are superposed on the cavity surface of the lower mold,
The lower mold is provided with a gas supply part for sending a gas to the lower side of the film to lift the film, and a foam molding die. In Claim 2 , the 1st convex part is provided in the upper model, The 2nd convex part is provided in the lower model,
The protruding portion protrudes from the tip surface of the second convex portion,
The foaming mold, wherein the second convex portion and the protruding portion are covered with the film. A foam molding die for integrally molding a molded product body having a through hole and an insert material having an opening overlapping the through hole,
The mold has an upper mold and a lower mold,
The first convex part of the through hole shape for forming a through hole in the molded product is projected from one cavity inner surface of the upper mold and the lower mold,
A second convex portion protrudes from the inner surface of the other cavity of the upper die and the lower die so as to face the first convex portion,
When the upper mold and the lower mold are clamped, the tip surfaces of the first convex portion and the second convex portion are in contact with the insert material, respectively, and the second convex portion is the first convex portion. In the mold for foam molding that is pushed by the convex part and the insert material and is elastically retractable,
A foam molding die in which a protrusion that can be engaged with the opening of the insert material is provided on one end face of the first protrusion and the second protrusion,
A film is superimposed on the cavity surface of the lower mold,
The lower mold is provided with a gas supply unit for sending gas to the lower side of the film to lift the film,
The first convex part is provided on the upper mold, and the second convex part is provided on the lower mold,
The projecting portion protrudes from the tip surface of the second convex portion,
The foaming mold, wherein the second convex part and the projecting part are covered with the film. According to claim 4, before Symbol the second convex portions, the foam mold, wherein a magnet for sucking and holding the insert member by a magnetic force is provided. 6. The foam molding die according to claim 2 , wherein the protruding portion has a shape in which an outer surface on a distal end side is curved. In any one of Claims 1 thru | or 6, the front end surface of the said 1st convex part and the 2nd convex part is respectively larger diameter than the opening of insert material over the perimeter,
The foaming mold according to claim 1, wherein the projecting portion is spaced apart from a peripheral portion of the tip surface toward the center of the tip surface. Characterized in any one of claims 1 to 7, on the other of the distal end surface of the first protrusion and the second protrusion, that the distal end side of the protrusion is engageable with the recess is provided Mold for foam molding.

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