JP2006281464A - Electroforming mold - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electroforming mold constituted so that an electroforming shell is fixed to a mold main body without being distorted and having fixing strength capable of withstanding even injection molding. <P>SOLUTION: In the electroforming mold 1 comprising the electroforming shell 10 which constitutes the molding surface of the mold and the mold main body 20 for supporting the electroforming shell 10, at least one through-hole 21 is provided to the mold main body 20 and the electroforming shell 10 and the mold main body 20 are connected by a connection means 30 located at the position of the through-hole 21. The connection means 30 comprises the fixing member 31 fixed to the back of the electroforming shell 10, the connection member 32 threaded with the fixing member 31 at its one end part and held on the side of the opening part of the through-hole 21 at its other end part and the regulation member 34 interposed between the fixing member 31 and the connection member 32 to regulate the clamping quantity of the connection member 32 to the fixing member 31. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an electroformed mold, and more particularly to an electroformed mold in which an electroformed shell is attached to a mold body.

2. Description of the Related Art Conventionally, an electroformed mold is used as a synthetic resin molding mold that is required to reproduce a fine pattern.
The electroformed mold is composed of an electroformed shell and a mold body. The electroformed shell is manufactured by electroplating a thick electroplating mold having a shape imitating a molded product, and then demolding and peeling the mold.

FIG. 5 shows a conventional electroforming mold. As shown in the figure, conventionally, the electroformed shell 110 is fixed to the mold body 120 by attaching the electroformed shell 110 to the mold body 120 and stopping the screws 140 from the surface of the electroformed shell 110.
As described above, conventionally, since the screws are fixed from the molding surface side of the electroformed shell 110, the appearance of the product is affected at the portion where the product is molded (A portion in FIG. 5). It was fixed only at the part (B part in FIG. 5).

There is a slight gap between the electroformed shell 110 and the mold body 120.
For this reason, there has been a problem that distortion or deformation of the electroformed shell 110 occurs during molding only by screwing the electroformed shell 110 from the front side.

  Further, since the screw is stopped from the electroformed shell surface side, there is a problem that the screw falls off due to the influence of thermal expansion or the like after long-term use.

Alternatively, there is a mold in which a hollow body is provided in a mold body that supports the electroformed shell, and an iron fiber is embedded in the hollow section, and mortar is poured and solidified to integrate the electroformed shell and the mold body. It has been proposed (see, for example, Patent Document 1).
JP 2000-190334 A

However, according to the technique of Patent Document 1, mortar is required as a separate member, and there is a disadvantage that quality control of the mortar is required.
Further, when the mortar is filled, there is a possibility that a portion where the mortar does not reach the hollow portion.

  An object of the present invention is to provide an electroforming mold in which an electroformed shell is fixed to a mold body without distortion and has a fixing strength that can withstand injection molding.

  According to the present invention, an object of the present invention is to provide an electroformed mold comprising an electroformed shell that constitutes a molding surface of a mold, and a mold body that supports the electroformed shell. Is provided with at least one or more through holes, and the electroformed shell and the mold body are connected by connecting means located in the through hole, and the connecting means is fixed to the back surface of the electroformed shell. A fixing member, a connecting member in which one end is screwed to the fixing member and the other end is held on the opening side of the through-hole, and the fixing member is interposed between the fixing member and the connecting member. And a restricting member that restricts the amount of tightening of the connecting member to the fixing member.

In the present invention, in an electroformed mold comprising an electroformed shell and a mold body, a through hole is provided in the mold body, and a connecting means for the electroformed shell and the mold body is disposed in the through hole.
A fixing member is fixed to the back surface of the electroformed shell, and one end of the connecting member is screwed to the fixing member. The other end of the connecting member is held on the opening side of the through hole, and the electroformed shell is fixed by pulling the electroformed shell by the connecting member and pulling it toward the mold body.

  In the present invention, since the electroformed shell is pulled from the back side of the electroformed shell and is fixed to the mold main body, the electroformed shell can be fixed even at the molding surface. Therefore, it is possible to more reliably fix the electroformed shell as compared with the prior art that can only be fixed at the peripheral edge.

  In addition, a regulating member is provided around the bolt to prevent the coupling member from being over-tightened to the fixing member. This restricting member prevents the coupling member from being excessively tightened on the fixing member, so that the electroformed shell is not pulled by excessive force, and the fixing member is peeled off or the electroformed shell is deformed. It becomes possible to prevent.

More specifically, the restriction member is a hollow cylindrical member, and is disposed around the coupling member in the through hole.
The fixing member is welded to the back surface of the electroformed shell.
A washer is disposed between the end of the connecting member and the opening, and the connecting member can be securely held, and the tightening of the connecting member can be adjusted by the thickness of the washer.
For example, the fixing member is a nut, and the connecting member is a bolt.

  According to the present invention, since it can be attached to the mold main body from the back side of the electroformed shell, the adhesion of the electroformed shell to the mold can be improved as compared with the conventional method of fixing only the outer periphery of the electroformed shell. Therefore, the distortion of the electroformed shell is prevented and the mold accuracy is improved.

  In addition, according to the present invention, a fixing member is provided on the back surface side of the electroformed shell, the connecting member is screwed to the fixing member, and the electroformed shell is pulled to the mold body side by the connecting member, thereby electroforming. The shell is fixed. At this time, in the metal mold | die of this invention, the regulating member is provided between the connection member and the fixing member, and the excessive fastening of the connection member is prevented. Thus, the electroformed shell is not pulled with an excessive force, and the peeling of the fixing member, the deformation of the electroformed shell, and the like are prevented.

Furthermore, since it is pulled and fixed from the back side of the electroformed shell, not only the outer periphery of the electroformed shell but also the product forming surface of the electroformed shell can be fixed as in the prior art. Accordingly, the fixing strength is increased and the durability performance of the mold is improved.
And by improving the durability performance of the mold, even when injection molding is performed, distortion and deformation of the electroformed shell due to resin pressure during molding can be suppressed, so product appearance and product accuracy can be improved. It becomes possible to improve.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The members, arrangements, and the like described below are not intended to limit the present invention and can be variously modified within the scope of the gist of the present invention.

  FIGS. 1 to 4 relate to an embodiment of the present invention, FIG. 1 is an explanatory sectional view of an electroformed mold, FIG. 2 is an enlarged view of the main part of FIG. 1, and FIG. 3 is an exploded perspective view of the electroformed mold. FIG. 4 is an explanatory view of a molding apparatus provided with an electroforming mold.

  An electroformed mold 1 according to an embodiment of the present invention includes an electroformed shell 10, a mold body 20, and a connecting means 30. The electroforming mold 1 is used for injection molding of synthetic resin, for example.

The electroformed shell 10 constitutes the molding surface of the mold. The electroformed shell 10 has a shape capable of forming a molded product such as a door trim, for example.
As an electroforming material for forming the electroformed shell 10, any metal such as nickel, copper, iron, or an alloy thereof can be used as long as electroforming is possible. Further, the electroforming material can be changed in the middle of the thickness of the electroformed shell 10. For example, the surface portion may be formed of an electroformed material having high hardness, and the remaining portion may be formed of another electroformed material. The molding surface of the electroformed shell 10 may be a smooth surface or may be provided with a fine uneven pattern such as a texture pattern.

The mold body 20 is located on the back surface of the electroformed shell 10 and supports the electroformed shell 10.
As a material for forming the mold body, various metal materials such as zinc, aluminum, iron, and alloys thereof, various synthetic resin materials such as epoxy resin, composite materials, and the like can be used.

A through hole 21 is provided at a predetermined location of the mold body 20. The connecting means 30 described below is located in the through hole 21.
The through hole 21 is provided at a desired position of the mold main body 20 and is provided in the vicinity of the molding surface in this example.

The connecting means 30 includes a nut 31 as a fixing member attached to the back surface of the electroformed shell 10, and a bolt 32 as a connecting member screwed into the nut 31.
The nut 31 is a threaded nut having a screw provided in the center hole, and is provided by being partially inserted into the electroformed shell 10 by welding or re-electroforming on the back surface of the electroformed shell 10.
The bolt 32 is provided with a screw on the outer periphery, and is formed so as to be able to be screwed onto the nut 31.

A washer 33 that engages with the head 32 a of the bolt 32 is provided on the periphery of the opening of the through hole 21.
By providing the washer 33, even if the diameter of the through-hole 21 is large, the head 32a of the bolt 32 can be reliably held at the periphery of the opening.
The distance between the head 32a of the bolt 32 and the nut 31 can be changed by the thickness of the washer 33, and the tightening amount of the bolt 32 can be adjusted.

  Further, a sleeve 34 as a restricting member is provided around the bolt 32 as the connecting means 30. The sleeve 34 is a hollow cylindrical member and is formed with a length l from the periphery of the opening of the through hole 21 to the upper surface of the nut 31. The sleeve 34 is made of a material having sufficient strength, such as iron or stainless steel. The sleeve 34 is only required to be able to restrict the tightening of the bolt 32, and is not limited to the hollow cylindrical shape, but may have another shape. In addition, the shape may be divided into a plurality of parts instead of an integral member.

  Since the sleeve 34 is provided, it is possible to prevent the bolt 32 from being over-tightened to the nut 31. In other words, the sleeve 34 is interposed between the head portion 32a of the bolt 32 and the nut 31 so that the bolt 32 is not tightened more than a predetermined tightening amount.

When the bolt 32 is excessively tightened, the force by which the bolt 32 pulls the electroformed shell 10 becomes strong, and the electroformed shell 10 is attracted to the mold body 20 with a strong force. Then, excessive force is also applied to the nut 31, and the welding of the nut 31 is peeled off or the electroformed shell 10 is deformed.
In this example, since the tightening amount of the bolt 32 is regulated by providing the sleeve 34, the above inconvenience can be prevented in advance.

Next, assembly of the electroformed shell 10 and the mold body 20 will be described.
First, assembling is performed on the molding surface 10a of the electroformed shell 10 as shown in FIG. First, the electroformed shell 10 is brought into contact with the mold body 20 so that the nut 31 of the electroformed shell 10 is positioned in the through hole 21 of the mold body 20.

  Then, a washer 33 and a sleeve 34 are interposed between the nut 31 and the head 32 a of the bolt 32, and the tip of the bolt 32 is screwed into the nut 31 and tightened. The head 32 a of the bolt 32 is pressed and held around the periphery of the opening of the through hole 21, and the electroformed shell 10 is pulled by the tightening of the bolt 32, and the electroformed shell 10 is attracted to the mold body 20 side. Fixed.

At the peripheral edge portion 10b other than the molding surface 10a of the electroformed shell 10, attachment is performed from the surface side of the electroformed shell 10 with a flat screw 40 as in the prior art.
In this way, fixing from both the molding surface 10 a and the peripheral edge portion 10 b is performed, and the electroformed shell 10 is suitably fixed to the mold body 20.

  With the above configuration, in the electroforming mold 1 provided with the electroformed shell 10, the electroformed shell 10 can be disposed while suppressing distortion as much as possible. In this way, it is possible to ensure the accuracy of the molded product.

FIG. 4 shows a molding apparatus S provided with the electroforming mold 1 of the present invention.
In the molding apparatus S, the electroforming mold 1 of the present invention constitutes the concave mold 60. The electroformed shell 10 of the concave mold 60 is fixed to the mold main body 20 by the connecting means 30 from the back side, and is attached by a flat screw 40 from the front side.

A convex mold 50 is disposed opposite to the concave mold 60. In such a molding apparatus S, a resin is injected between the convex mold 50 and the concave mold 60 to form a molded product.
In this example, the fixing by the connecting means 30 from the back side is performed on the right side of FIG. 4, but may be performed on the left side as well. Or you may carry out in the center part. Furthermore, you may carry out in several places. Since the fixing by the connecting means 30 does not affect the molding surface, it can be appropriately performed at a predetermined location according to the mold shape or the like.

In the molding apparatus S of FIG. 4, a stripper plate 70 is interposed between the convex mold 50 and the concave mold 60.
The molding apparatus S shown in FIG. 4 has a configuration that is particularly suitable for manufacturing a molded product having a skin material.
The configuration of the molding apparatus S will be described below.

  The concave mold 60 is provided with a tapered portion 61. The tapered portion 61 is provided at the peripheral edge of the cavity of the concave mold 60 and is provided so as to surround the cavity.

  The inclination angle of the taper portion 61 is set to 25 degrees to 65 degrees, preferably 45 degrees with respect to the clamping direction of the convex mold 50 and the concave mold 60.

  The stripper plate 70 projects the molded product after molding, but the stripper plate 70 of this example holds the skin material with the concave mold 60 when molding the molded product having the skin material. It also has functions.

  In the stripper plate 70 of this example, a nesting member 75 is attached, and an inclined portion 72 is provided on the nesting member 75. The inclined portion 72 is formed so as to protrude toward the cavity between the convex mold 50 and the concave mold 60.

The skin material is held between the inclined portion 72 of the stripper plate 70 and the tapered portion 61 of the recess 60. For this reason, the inclined portion 72 is formed at an angle corresponding to the tapered portion 61 of the recess 60.
That is, it is formed at an inclination angle of 25 to 65 degrees, preferably 45 degrees with respect to the clamping direction of the convex mold 50 and the concave mold 60.

  Before the mold clamping, the stripper plate 70 moves to the concave mold 60 side, and the end portion of the skin material is held by the tapered portion 61 of the concave mold 60 and the inclined portion 72 of the stripper plate 70.

  Since the skin material is held by the tapered portion 61 of the concave mold 60 and the inclined portion 72 of the stripper plate 70, the skin material is at the boundary between the portion located in the cavity of the skin material and the portion located outside the cavity. Since it is held in a smoothly continuous state, there will be no broken lines on the skin material.

  After molding, the end portion of the skin material is wound on the back side of the molded product and processed, but according to this configuration, the end portion of the skin material does not have a broken line, and the skin material is in the direction opposite to the winding direction. Since there is no crease, the end treatment of the skin material can be performed smoothly during the end treatment after molding.

  Further, when the skin material is held between the convex mold 50, the stripper plate 70, and the concave mold 60, the portion where the skin material is held is tapered. When the skin material is pushed into the cavity by pressing, or when the molten resin is injected and filled into the cavity, the skin material moderately slides from the end side toward the cavity, It is possible to prevent local unreasonableness on the material. This prevents local elongation and tearing during the epidermis.

It is a section explanatory view of the electroforming metal mold concerning the example of the present invention. It is a principal part enlarged view of FIG. It is a perspective view which shows the assembly | attachment of the electroforming metal mold | die which concerns on the Example of this invention. It is explanatory drawing of the shaping | molding apparatus provided with the electroforming metal mold | die which concerns on the Example of this invention. It is explanatory drawing which shows a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electroformed mold 10 Electroformed shell 10a Molding surface 10b Peripheral part 20 Mold body 21 Through-hole 30 Connecting means 31 Nut (fixing member)
32 bolt (connecting member)
32a Head 33 Washer 34 Sleeve (Regulator)
40 Flat screw 50 Convex 60 Concave 61 Tapered part 70 Stripper plate 72 Inclined part 75 Nested member S Molding device

Claims (5)

An electroformed mold comprising an electroformed shell constituting a molding surface of a mold, and a mold body that supports the electroformed shell,
The mold body is provided with at least one through hole,
The electroformed shell and the mold body are connected by a connecting means located in the through hole,
The connecting means includes a fixing member fixed to the back surface of the electroformed shell,
A connecting member in which one end is screwed to the fixing member and the other end is held on the opening side of the through hole;
An electroforming mold comprising: a restricting member interposed between the fixing member and the connecting member and restricting a tightening amount of the connecting member to the fixing member.   The electroforming mold according to claim 1, wherein the regulating member is a hollow cylindrical member, and is disposed around the coupling member in the through hole.   The electroforming mold according to claim 1, wherein the fixing member is welded to the back surface of the electroformed shell.   The electroforming mold according to claim 1, wherein a washer is disposed between the end of the connecting member and the opening.   The electroforming mold according to claim 1, wherein the fixing member is a nut, and the connecting member is a bolt.

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