JP2656876B2 - Manufacturing method of electroforming mold - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing an electroforming mold used for injection molding, hollow molding and the like of plastics, and in particular, can easily form a flow path for a heating / cooling fluid suitable for a large mold. About things.

[0002]

2. Description of the Related Art Conventionally, as this type of electroforming mold, FIG.
The following are known. In FIG. 7, the electroforming mold includes an electroforming shell 51 formed by depositing a metal such as nickel or copper to a predetermined thickness by electroforming with a backing material 52 of a thermosetting resin or a low melting point alloy. A stainless steel pipe 53 serving as a flow path of a heating / cooling fluid is attached to a silver braze 54 on the back surface 51 b of the electroformed shell 51. The stainless steel pipe 53 travels in a meandering manner along the back surface 51 b of the electroformed shell 51, and a heating / cooling fluid flows through the stainless steel pipe 53 to exchange heat with the electroformed shell 51. By heating and cooling the electroformed shell 51, the plastic material injected on the surface 51a of the electroformed shell 51 is molded. In addition, 55 is a formwork,
Although the figure shows the cavity in the electroforming mold, the core has the same configuration.

[0003]

In the electroforming mold described in the prior art, a stainless steel pipe 53 serving as a flow path of a heating / cooling fluid is brazed to the back surface 51b of an electroformed shell 51 by silver brazing. The electroformed shell 51 has a complicated three-dimensional shape, and processing the stainless steel pipe 53 along this shape requires many man-hours. For this reason, the manufacturing cost of the stainless steel pipe 53 is high, and when the size of the die is large, it is considerably high, thereby increasing the manufacturing cost of the die. In addition, when the stainless steel pipe 53 is silver-brazed to the back surface 51b of the electroformed shell 51, especially when the size of the mold becomes large, the influence of thermal distortion becomes large, and it becomes impossible to secure the molding accuracy. Further, the heating / cooling fluid exchanges heat with the electroformed shell 51 via the stainless steel pipe 53 and the silver solder. However, since there are many portions not filled with the silver solder, the heat exchange efficiency is poor. As a result, it takes a long time to heat and cool the electroformed shell 51, resulting in a problem that the molding cycle becomes longer.

The present invention has been made in view of the above-mentioned problems of the prior art, and has as its object to reduce the manufacturing cost of a mold, secure molding accuracy, and shorten the molding cycle. An object of the present invention is to provide an electroforming mold and a method for manufacturing the same.

[0005]

In order to solve the above-mentioned object, a method of manufacturing an electroformed mold according to the present invention comprises an electroformed shell formed by electroforming and a backside of the electroformed shell. comprising <br/> and Luba Kkingu material to, a flow path for the heating and cooling fluid is provided at a boundary between the electroformed shell as the backing material, prior Kiryuro, the electrodeposition of the backing material A method of manufacturing an electroformed mold formed from a concave portion opening at a boundary surface with respect to a cast shell and a back surface of the electroformed shell facing the concave portion, wherein a step of forming the electroformed shell by electroforming. a step of laying the actual traveling body in the low-melting member corresponding to the flow path on the electroformed shell, the low melting point on the electroformed shell
Flowable thermosetting tree at a temperature below the melting point of the component
Solidified by pouring fat, and give Ru step the backing material, said heating the whole at a temperature higher than the melting point of the melting member to melt discharged before Symbol melting member by, the resulting Ru step the flow path
It comprises .

[0006] A similar electroformed mold manufacturing method of forming a electroformed shell by electroforming, the mesh of the outer surface of the thermosetting resins is sealed and solidified on the electroformed shell laid a hollow traveling body in a wire mesh, process and thermosetting pre Symbol thermosetting resin or its homologous on electroformed shell to obtain a flow path
A resin is solidified by pouring what is in fluidized state, those comprising obtaining a backing material mower
You .

[0007]

The flow path is formed by a concave portion opened at the boundary surface of the backing material with respect to the electroformed shell and a back surface of the electroformed shell facing the concave portion, and the heating / cooling fluid flowing through the flow channel is formed. Performs direct heat exchange with the electroformed shell. This channel is a thermosetting material for laying a solid running body of a low melting point member on an electroformed shell and forming a backing material on it.
After the resin is poured and solidified, the low melting point member is melted and discharged. In addition, thermosetting tree
The fat is heated to a temperature enough to melt low-melting members in the fluidized state.
The cured thermosetting resin must not be
It does not melt at the melting point of the low melting point member.

Furthermore, this flow path, the mesh of the outer surface with a thermosetting resin is also formed by laying the hollow traveling body blocked solidified wire mesh. Once hardened thermosetting
The resin is the same or similar type of thermoset in the fluid state
Does not dissolve even when touching the conductive resin. Therefore, wire mesh
In the process of forming a backing material on top of
The sealed thermosetting resin is
Material (the same or similar thermosetting resin as the thermosetting resin)
Is not melted until it hardens, the hollow body is maintained,
A path is formed.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view of the electroformed mold of the present invention, FIG. 2 is a view taken in the direction of arrow A in FIG. 1, and FIG. 3 and FIG.

In FIG. 1 and FIG. 2, this electroforming mold comprises an electroformed shell 1 formed by depositing a metal such as nickel or copper to a predetermined thickness by electroforming. is obtained by reinforcing lining with backing material 2 made of resin, the concave portion 2b is provided on the boundary surface 2a of the shell 1 electroforming backing material 2. The concave portion 2b of the backing material 2 travels in the mold in a meandering manner along the back surface 1b of the electroformed shell 1, and the electroformed shell 1 facing the concave portion 2b.
A flow path 3 penetrating the mold is formed with the back surface 1b. When the plasticized plastic material is injected onto the surface 1a of the electroformed shell 1 serving as a molding surface and molded, the heating / cooling fluid is allowed to flow through the flow path 3 to form the electroformed shell 1.
And heat exchange is performed directly between the electroformed shell 1 and the heating and cooling of the electroformed shell 1. Reference numeral 4 denotes a mold.

Next, a method of manufacturing the above-described electroforming mold will be described with reference to FIGS. As shown in FIG. 3A, an electroformed master 11 having the same shape as a molded article made of an epoxy resin, a polyester resin, or the like (an inverse model of an electroformed mold).
The conductive layer 12 is provided on the surface of the electroformed master 11 by a silver film or the like by silver mirror processing. And FIG.
As shown in (b), the electroforming master 11 is replaced with an electroforming tank 14 in which a metal 13 such as nickel or copper is connected to a positive electrode.
In the electrolytic solution 15 of the above. Then, the conductive layer 12 is connected to the negative electrode and energized, and the electroforming master 11 is subjected to electroforming. Thereby, the conductive layer 1 on the surface of the electroformed master 11
Metals such as nickel and copper are deposited on 2 to form an electroformed layer 1. When the electroformed layer 1 has a predetermined thickness (2 to 3 mm), the electroformed master 11 is taken out of the electrolytic solution 15, and FIG.
As shown in (c), a low-melting member such as wax, paraffin, or a low-melting alloy (for example, an alloy of bismuth and lead) is adhered onto the electroformed shell 1 (electroformed layer) to form an electroformed shell. 1, a solid running body 18 running in a meandering manner on the electroformed shell 1 is laid.

Furthermore, as shown in FIG. 4 (a), the back side of the electroformed shell 1 surrounds the mold 4, fine thermosetting resins of epoxy resin in a fluid state into the mold 4 < The injection material 2 is injected. Then, the backing material 2 is solidified over time. In addition, thermosetting resin such as epoxy resin
Fat is not so expensive because it hardens due to intermolecular cross-linking with hardener
Solid running without the need to heat up to above the melting point of the low melting point member
Does not melt body 18. Then, as shown in FIG. 4 (b), the electroformed shell 1 is formed on the surface of the electroformed master 11, and the solid running body 18 of the low melting point member runs in a meandering shape on the electroformed shell 1, the the electroformed member 21 which is integral lining in the heating oven 22 in the backing material 2, a low-melting portion
The material is heated to a temperature higher than the melting point of the material to melt and discharge the solid running body 18 of the low melting point member. Then, the electroformed body 21 is taken out of the heating oven 22, and the electroformed master 11 is taken out of the electroformed shell 1 as shown in FIG.
As a result, an electroformed mold having a flow path 3 running in a meandering shape along the back surface 1b of the electroformed shell 1 is manufactured by lining the electroformed shell 1 serving as a forming surface with the backing material 2. . Although the figure shows the cavity in the electroforming mold, the core can have the same configuration and can be manufactured by the same manufacturing method.

As described above, the flow path 3 is formed by the concave portion 2 b opening at the boundary surface 2 a of the backing material 2 with respect to the electroformed shell 1.
And the back surface 1b of the electroformed shell 1 facing the concave portion 2b, and the heating / cooling fluid flowing through the flow path 3 directly exchanges heat with the electroformed shell 1. as a result,
Since the heat exchange efficiency between the heating / cooling fluid and the electroformed shell 1 is improved, the heating and cooling of the electroformed shell 1 can be performed in a short time, and the molding cycle can be shortened. Also, since stainless steel pipes are not required,
The manufacturing cost of the mold can be reduced. Furthermore, since silver brazing of the stainless steel pipe to the electroformed shell 1 is not performed, the thickness of the electroformed shell 1 can be reduced, and from this point, the heat exchange efficiency can be improved and the molding cycle can be shortened. Can be made, and the production cost of the mold can be reduced. Since there is no thermal distortion of the electroformed shell 1 due to silver brazing, molding accuracy can be ensured and a large mold can be manufactured.

Further, in the above embodiment, the case where the flow path along the electroformed shell is formed by using the solid traveling body of the low melting point member has been described. However, as shown in FIG. A flow path along the electroformed shell can be formed using a wire net 31 formed in a shape and freely deformable. In this case, as shown in FIG. 6A, the electroformed shell 1 is provided on the electroformed shell 1 formed by electroforming instead of the low melting point member.
Stuck a wire mesh 31 which processed along the same to or with <br/> same kind of thermosetting resin and thermosetting resin of the backing material 2 to the surface of the wire mesh 31 (e.g., both use an epoxy resin
Such a case is applied to the mesh or the contact portion with the electroformed shell 1 and solidified, and the wire mesh 31 that closes the mesh or the like is a hollow traveling body that runs in a meandering shape on the electroformed shell 1. Also in this case, as shown in FIG. 6B, the back side of the electroformed shell 1 is surrounded by the mold 4, and the backing material 2 in a flowing state is injected into the mold 4. Then, the backing material 2 is solidified with the passage of time, and as shown in FIG. 6C, the electroformed shell 11 serving as a molding surface is lined with the backing material 2 by extracting the electroformed master 11 from the electroformed shell 1. Thus, an electroforming mold having a flow path 3 reinforced and having a meandering running along the back surface 1b of the electroformed shell 1 is manufactured. In this case, since a cavity serving as a flow path has already been formed in the hollow traveling body, a step of melting and discharging the low melting point member is not required.

[0015]

The present invention is configured as described above, and has the following effects.

The flow path is formed by a concave portion that opens at the boundary surface of the backing material with respect to the electroformed shell, and a back surface of the electroformed shell that faces the concave portion, and the heating / cooling fluid flowing through the flow channel. Performs direct heat exchange with the electroformed shell. As a result, since the heat exchange efficiency between the heating / cooling fluid and the electroformed shell is improved, the heating and cooling of the electroformed shell can be performed in a short time, and the molding cycle can be shortened. Further, since a stainless steel pipe is not required, the manufacturing cost of the mold can be reduced.
Furthermore, since silver brazing of the stainless steel pipe to the electroformed shell is not performed, there is no thermal distortion of the electroformed shell, so that molding accuracy can be secured, and a large mold can be manufactured by electroforming. It becomes possible.

In such an excellent flow path, the backing material is
A thermosetting resin that is formed by laying a solid running body of a low-melting member on an electroformed shell and melting and discharging the low-melting member, or a thermosetting resin that forms a backing material same or this and since the mesh of the outer surface with a thermosetting resin of the same kind is also formed by laying the hollow running body of wire mesh that is blocked and solidified, the desired heating and cooling passages by a simple process and Can be manufactured.

[Brief description of the drawings]

FIG. 1 is a sectional view of an electroforming mold of the present invention.

FIG. 2 is a view taken in the direction of arrow A in FIG. 1;

FIG. 3 is a view showing a method of manufacturing an electroforming mold according to the present invention.

FIG. 4 is a view showing a method of manufacturing an electroforming mold according to the present invention.

FIG. 5 is a diagram showing a wire net;

FIG. 6 is a view showing a method of manufacturing another electroforming mold according to the present invention.

FIG. 7 is a sectional view of a conventional electroforming mold.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 electroformed shell 1 a front surface of electroformed shell 1 b back surface of electroformed shell 2 backing material 2 a interface between backing material and electroformed shell 2 b concave portion of backing material 3 flow path 11 electroformed master 12 conductive layer 18 solid running body

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Sekiji Nagata 48-2 Miyamae, Hokkoji-cho, Nishio-shi, Aichi Osada Seiko Co., Ltd.

Claims (2)

(57) [Claims] And 1. A electroforming electroformed shell formed by machining, and Luba Kkingu material to reinforce the back surface side of the electrolyte cast shell,
And a flow path for the heating and cooling fluid is provided at a boundary between the electroformed shell as the backing material, prior Kiryuro includes a recess which opens to the boundary surface with respect to the electroformed shell of the backing material, a method of manufacturing a mold electroforming is formed from the back of the electroformed shell facing the recess, forming a electroformed shell by electroforming, corresponding to the flow path on the electroformed shell Laying a solid running body of a low melting point member to be heated to a temperature lower than the melting point of the low melting point member on the electroformed shell.
Solidified by pouring thermosetting resins of a fluid state, prior to
And the serial backing material Ru obtain step, the heating the whole at a temperature higher than the melting point of the melting member
Before SL melted discharged melting member, resulting Ru process and the comprising at electroformed mold manufacturing method of the flow path. 2. A electroforming electroformed shell formed by machining, and Luba Kkingu material to reinforce the back surface side of the electrolyte cast shell,
Comprises a flow path for the heating and cooling fluid is provided at a boundary between the electroformed shell as the backing material, prior Kiryuro includes a recess which opens to the boundary surface with respect to the electroformed shell of the backing material, this a method of manufacturing a mold electroforming is formed from the back of the electroformed shell facing the recess, electroforming and forming electroformed shell by machining, thermosetting resins on electroformed shell laying a hollow traveling body in a wire mesh which mesh of the outer surface of which is sealed and solidified <br/>, obtaining a flow path, heat stiffness before Symbol thermosetting resin or its homologous on electroformed shell
Of resin in a solidifying by pouring what is in a fluid state, a method of manufacturing the mold electroforming comprising a give Ru step the backing material.