JP2011110749A - Mold for skin material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mold for a skin material with strong tensile strength. <P>SOLUTION: The mold for a skin material 10 is provided for molding the skin material SK into a predetermined shape along a mold face 33, and includes base bodies 35, 36 formed by solidifying a particulate material, and a resin sheet 37 which is joined onto the base bodies 35, 36 to form the mold surface 33 and has ventilation holes 38 sucking the skin material SK, formed on the mold surface 33. The base bodies 35, 36 have characteristics of hardly being affected by compression force though liable to be affected by the tensile strength. Assuming corner parts 35C, 36C as parts to easily receive the tensile strength in the base bodies 35, 36, bolts B and outer frames 22 normally imparting the compression force to the corner parts 35C, 36C are provided, by pressing the faces corresponding to the corner parts 35C, 36C in the acting direction of the tensile strength in the direction opposite to the acting direction of the tensile strength. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a skin material molding die for molding a skin material into a predetermined shape along a mold surface.

  As this type of skin material molding die, for example, the one described in Patent Document 1 below is known. This is formed by having a base in which metal particles are hardened with a binder resin, and bonding a resin sheet having a texture pattern on the gas. In this resin sheet, a plurality of air holes are formed so that the skin material is attracted onto the resin sheet through the plurality of air holes by evacuating the base so that the texture pattern is transferred to the surface of the skin material. It is configured.

JP 2006-326904 A

  Generally, a structure in which a granular material is hardened (for example, concrete) has a characteristic that it is strong against compressive force but weak against tensile force. For this reason, similarly to the above-described substrate, when a tensile force is applied, the skin material mold is easily damaged by cracks in the substrate.

  This invention is completed based on the above situations, Comprising: It aims at providing the skin material shaping | molding die strong against a tensile force.

  The present invention is a skin material molding die for molding a skin material into a predetermined shape along a mold surface, a base formed by solidifying a granular material, and a mold surface formed by bonding onto the base. And a resin sheet in which a vent hole for sucking the skin material is formed, and the base body is susceptible to tensile force, but has a characteristic not easily affected by compressive force, and is susceptible to tensile force in the base body. When the part is used as a receiving part, a compression device is always provided that applies a compressive force to the receiving part by pushing the surface corresponding to the receiving part in the direction in which the tensile force acts in the direction opposite to the direction in which the tensile force acts. It is characterized by having the configuration as described above.

  According to such a configuration, since the compressing force can be applied to the receiving portion by the compression device, even if a tensile force is unexpectedly applied to the receiving portion, the tensile force is offset by the compressing force applied in advance. It is possible to avoid a tensile force from acting on the receiving portion. Similarly, when a tensile force exceeding the pre-applied compressive force is applied, the tensile force corresponding to the pre-applied compressive force is canceled out. Can be reduced. Therefore, it is possible to provide a skin material mold that is strong against tensile force.

The following configuration is preferable as an embodiment of the present invention.
Provided with an assist mold that pushes the skin material placed on the resin sheet, the mold surface has a concave shape that allows the assist mold to be fitted therein, and the receiving portion is a standing wall that extends in the push direction of the assist mold It is good also as a structure which is a corner | angular part with the plane part extended in the direction which cross | intersects the assist type pushing direction.

  For example, when the assist mold is displaced in a direction orthogonal to the pushing direction, if the assist mold is forcibly pushed, the standing wall portion may act to open and deform around the corner portion. In that respect, according to the above configuration, since the compressive force is preliminarily applied to the corner portion, the tensile force applied to the corner portion is offset, and the skin material mold can be prevented from being damaged.

  ADVANTAGE OF THE INVENTION According to this invention, the skin material shaping | molding die strong against a tensile force can be provided.

Plan view of the skin material molding die of the embodiment AA line sectional view in FIG.

<Embodiment>
An embodiment of the present invention will be described with reference to FIGS. 1 and 2. As shown in FIG. 1, the skin material molding die 10 in this embodiment is for molding a skin material SK to be attached to the surface of an upper board (not shown) that constitutes the upper part of a door trim (not shown). This is a molding die. The skin material molding die 10 is a two-piece molding die in which a pair of skin materials SK are simultaneously molded by one molding. The skin material molding die 10 is installed on the upper surface of the base P.

  The skin material molding die 10 has an iron mold, and this mold has a horizontally long substantially rectangular shape and is constituted by four frame members 20. Moreover, the compression plate 21 is being fixed to the inner surface side of each frame material 20, respectively. The pair of frame members 20 constituting the long side of the four frame members 20 are arranged in an opposed state in a form extending in the longitudinal direction of the mold. The pair of frame members 20 constituting the short side of the four frame members 20 are arranged in a state of being sandwiched between the frame members 20 on the long side. Both end portions of the frame material 20 on the short side are welded to compression plates 21 attached to the inner surface side of the frame material 20 on the long side.

  As shown in FIG. 2, a mold 30 made of a plurality of materials and a plurality of reinforcing ribs that support and reinforce the lower surface of the mold 30 are formed inside the mold formed of the four frames 20. 31 is accommodated. The plurality of reinforcing ribs 31 are made of iron and are intermittently disposed below the mold 30. A mold surface 33 having a recessed portion 32 recessed downward is formed on the upper surface of the mold 30, and the assist mold 40 can be fitted into the recessed portion 32 from above.

  In the present embodiment, the mold 30 is arranged in order of the mold bottom 34, the first base 35, the second base 36, and the resin sheet 37 from the bottom. The mold bottom 34 has a flat plate shape, and the frame member 20 is installed on the upper surface of the mold bottom 34. The plurality of reinforcing ribs 31 support the lower surface of the mold bottom 34.

  The first substrate 35 is formed by solidifying particulate aluminum with an epoxy resin (generally called “aluminum grid”). This epoxy resin functions as a binder for hardening the aluminum grid. For this reason, the first base body 35 is made porous in a porous shape, whereby a gap (not shown) is formed inside the first base body 35. As a result, the first base body 35 has a characteristic that it is easily damaged by receiving a tensile force but is not easily damaged by receiving a compressive force.

  The second substrate 36 is made of a porous material similar to the first substrate 35 and is formed by solidifying an aluminum having an average particle size smaller than that of the aluminum used in the first substrate 35 with an epoxy resin. Accordingly, a gap (not shown) smaller than the gap of the first base 35 is formed inside the second base 36. For this reason, the second base body 36 also has a characteristic that it is easily damaged by receiving a tensile force but is not easily damaged by receiving a compressive force.

  A temperature control pipe (not shown) is disposed near the interface between the first base 35 and the second base 36. The entire mold 30 is heated by this temperature control piping. The first base 35 has a thickness of about 50 to 100 mm as a whole, and the second base 36 has a thickness of about 30 to 50 mm as a whole.

  The second substrate 36 is bonded to the upper surface of the first substrate 35, and the both substrates 35, 36 constitute the “substrate” of the present invention. Both bases 35 and 36 are composed of flat portions 35A and 36A having a flat planar shape and standing wall portions 35B and 36B rising upward from the outer peripheral portions of the flat portions 35A and 36A. A concave portion 32 having a shape is formed. Both flat portions 35A and 36A are configured to extend in a direction orthogonal to the pushing direction of the assist die 40, and the compatible wall portions 35B and 36B are configured to extend substantially in the pushing direction of the assist die 40.

  Both corner portions 35C and 36C, which are the boundary portions between both flat portions 35A and 36A and the compatible wall portions 35B and 36B, are places where the tensile force is easily received from the assist die 40. Specifically, when the assist mold 40 is properly fitted to the recess 32, the corner sections 35C and 36C are not subjected to a tensile force, but the assist mold 40 is orthogonal to the fitting direction. When fitting in the recess 32 by shifting in the direction, the compatible wall portions 35B and 35B act to open and deform outwardly with the corner portions 35C and 36C as the center, so that the corner portions 35C and 36C are easily subjected to tensile force. Become.

  The resin sheet 37 is bonded to the upper surface of the second base 36. A texture pattern is formed on the surface of the resin sheet 37 (the surface opposite to the joint surface with the second base 36), and the texture pattern can be transferred to the skin material SK. That is, the above-described mold surface 33 is formed by the upper surface of the resin sheet 37. In addition, a plurality of vent holes 38 are formed through the resin sheet 37. These vent holes 38 are in communication with a gap formed in the second base 36.

  The resin sheet 37 is formed of an epoxy resin containing ceramic whiskers and has extensibility. Specifically, the resin sheet 37 is obtained by sticking a sheet material called “ceramic” on a sheet material called “gel coat” having no air permeability. The gel coat has a thickness of about 1 mm, and is used to prevent the rough surface of the second substrate 36 from being transferred to the skin material SK. The gel coat has a smooth surface. On the other hand, the ceramic grain has a thickness of about 0.3 mm, and includes a grain pattern that is a base of the grain pattern transferred to the skin material SK. Such a resin sheet 37 is the same as that described in, for example, Japanese Patent Publication No. 2-14173.

  On the other hand, a suction hole 34A is formed in the center of the mold bottom 34, and a vacuum hole P1 is formed in the base P at a position corresponding to the suction hole 34A in the vertical direction. The suction hole 34 </ b> A and the vacuum hole P <b> 1 are communicated with each other by a pipe 39 disposed therebetween. Further, the vacuum hole P <b> 1 is connected to a vacuum pump (not shown) installed outside the skin material molding die 10. Therefore, when evacuation is performed with a vacuum pump, the interior of the cavity mold 30 is evacuated and the skin material SK is sucked into the mold surface 33 through the vent holes 38. In addition, the assist mold 40 pushes the skin material SK into the mold surface 33, whereby the skin material SK is formed into a predetermined shape, and the embossed pattern is transferred to the surface of the skin material SK.

  An outer frame 22 is erected upward on the upper surface of the base P, and a bolt B is screwed to the upper end portion of the outer frame 22. The bolt B can be advanced and retracted in a direction in which the frame member 20 and the outer frame 22 in an opposed state approach and separate from each other (a direction in which both corners 35C and 36C receive a tensile force as the assist die 40 is pushed). Yes. The inner end of the bolt B is in contact with the frame member 20, and the compression plate 21 is pushed into the interior of the mold 30 via the frame member 20 by tightening the bolt B. As shown in FIG. 1, the compression plate 21 is provided at four locations so as to surround the mold 30. The mold 30 receives the compression force directly from each compression plate 21. The outer frame 22 and the bolt B are examples of the “compressor” of the present invention.

  Further, the four frame members 20 constituting the mold are movable independently, and are welded to each other while being pushed into the interior of the mold 30 by the bolt B. Therefore, the mold 30 is always in a state where a compressive force is applied. Here, since the compression plate 21 is in contact with both corner portions 35C and 36C on the outer peripheral surface of the standing wall portion 35B, the compression force transmitted from the compression plate 21 is applied to both corner portions 35C and 36C. Surely granted. Thereby, when a tensile force acts on both corners 35C and 36C, the tensile force is canceled by the compressive force inherent in both corners 35C and 36C, and the mold 30 is cracked in both corners 35C and 36C. The damage can be avoided. Further, even when a tensile force exceeding a preliminarily applied compressive force is applied to both corner portions 35C and 36C, the tensile force is reduced by the amount of the inherent compressive force, so that it is easy to avoid damage to the mold 30. .

  The present invention is configured as described above, and its operation will be described next. First, a method for forming (shaping) the skin material SK into a predetermined shape will be described. When molding the skin material SK, the skin material SK heated and softened is placed between the cavity mold 30 and the assist mold 40 in the mold open state. Next, the mold is closed while a negative pressure is introduced into the mold 30 by a vacuum pump. As a result, a negative pressure generated by the vacuum pump is introduced into the gaps in the bases 35 and 36, and the skin material SK is sucked into the mold surface 33 through the vent holes 38 of the resin sheet 37. By the suction by the vacuum pump and the pushing by the assist die 40, the skin material SK is attracted uniformly along the mold surface 33, the embossed pattern is transferred to the surface of the skin material SK, and the skin material SK has a predetermined shape. To be molded.

  Here, when the assist die 40 is slightly pushed in the direction perpendicular to the pushing direction with respect to the normal pushing position when the assist die 40 is pushed in, the assist die 40 comes into contact with the outer peripheral portion of the recess 32. The compatible wall portions 35B and 36B open and deform outwardly about the corner portions 35C and 36C. However, since both corner portions 35C and 36C are preliminarily applied with the compression force by the bolt B via the compression plate 21 and the frame member 20, the compatible wall portions 35B and 36B are not easily opened and deformed, and both corner portions 35C and 36C. It becomes difficult for the tensile force to act on. Thereby, it can avoid that a crack enters into both corners 35C and 36C.

  As described above, in the present embodiment, by tightening the bolt B, the compressing force is applied from the opposite direction to the direction in which the two corner portions 35C and 36C receive the tensile force. As a result, the tensile force acting on the mold is offset, and the cavity mold 30 can be prevented from being damaged. In addition, even when a tensile force exceeding a preliminarily applied compressive force is applied, the tensile force acting on both corner portions 35C and 36C can be reduced, so that the mold 30 can be prevented from being damaged. In addition, even if the corners 35C and 36C are cracked, the crack can be prevented so that the mold 30 can be prevented from being damaged.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.
(1) Although the tightening by the bolt B is exemplified as the compression device in the above embodiment, a hydraulic cylinder or the like may be used according to the present invention.

  (2) In the above embodiment, an aluminum grid is exemplified as the substrate, but according to the present invention, other metal particles may be hardened.

  (3) In the above embodiment, the corner portions 35C and 36C formed on the outer peripheral portions of the flat portions 35A and 36A are illustrated as the receiving portions. However, according to the present invention, for example, the central portion of the flat portions 35A and 36A When a protrusion is provided on the base, a base portion of the protrusion may be used as a receiving portion.

DESCRIPTION OF SYMBOLS 10 ... Skin material shaping | molding die 20 ... Frame material 22 ... Outer frame (compression apparatus)
33 ... Mold surface 35 ... First base 35A ... Flat part 35B ... Standing wall part 35C ... Corner part 36 ... Second base 36A ... Flat part 36B ... Standing wall part 36C ... Corner part 37 ... Resin sheet 38 ... Vent 40 ... Assist type B ... Bolt (compressor)
SK ... Skin material

Claims (2)

A skin material molding die for molding the skin material into a predetermined shape along the mold surface,
A substrate formed by solidifying a granular material;
A resin sheet formed on the mold surface to form the mold surface and formed with a vent hole for sucking the skin material on the mold surface;
The substrate has characteristics that are easily affected by a tensile force but hardly affected by a compressive force,
When a receiving portion that is susceptible to tensile force in the base is used as a receiving portion, the surface corresponding to the receiving portion is always pushed in the direction opposite to the direction in which the tensile force acts in the direction in which the tensile force acts. A skin material molding die, wherein a compression device for applying a compressive force to the receiving portion is provided. Provided with an assist mold for pushing the skin material placed on the resin sheet,
The mold surface has a concave shape capable of fitting the assist mold inside,
The skin material molding according to claim 1, wherein the receiving portion is a corner portion of a standing wall portion extending in the pushing direction of the assist type and a flat portion extending in a direction intersecting the pushing direction of the assist type. Type.

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