JPS6130691A - Production of electroforming mold - Google Patents

Abstract

PURPOSE:To produce easily, quickly and inexpensively an electroforming mold having excellent accuracy and strength by forming an electroforming shell via a conductive strippable film on the surface of a model mold, setting a molding flask thereon and packing a low-shrinkable packing material into the flask. CONSTITUTION:The conductive strippable film 3 is coated to the product shape surface of the model 1 formed of gypsum, etc. and the model is dipped into the electrolyte 5 in an electrolytic cell 4 where electrolysis is effected with Ni, etc. as an anode 6 and said film 3 as a cathode to deposit Ni, etc. on the outside surface of the film 3 thereby depositing and forming about 2-15mm. electroforming shell 7. The model 1 is thereafter taken out and the molding flask 8 which consists of a peripheral wall 801 having ribs 803 and a top wall 802 having a detaining rib 804 and is opened downward is set and fixed to the model from above. The low-shrinkable fluid packing material 9 prepd. by mixing, for example, cement and iron powder is admitted and packed through the packing material inflow port 805 of the wall 802 into the space between the flask 8 and the shell 7. The model 1 is then parted from the flask 8 and shell 7 united and solidified to one body by the packing material 8 and the electroforming mold is obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method of manufacturing an electroforming mold used for a plastic mold, press mold, rubber mold, or the like.

(Prior art) Molds are used as plastic molding molds, press molds, etc., and the molding part (molding part) of the mold is formed by machining cast steel, cast iron, etc., and copying machining. many.

(Problems to be Solved by the Invention) The above-mentioned conventional techniques require a large number of man-hours to manufacture the mold, require many machining processes, and therefore are troublesome and complicated to manufacture, and require many times to manufacture. The mold material is also produced by cutting out metal, which has disadvantages such as high material cost and increased mold weight. Naturally, the mold cost also increases due to the above.

The present invention has been made to solve the above technical problems.

(Objective of the Invention) The object of the present invention is to simplify mold manufacturing, significantly reduce manufacturing days, reduce man-hours, lighten the bar of the mold, reduce mold material costs, and reduce mold manufacturing costs. To provide a method for producing an electroforming mold that can significantly reduce the amount of mold, is suitable for many types of small lids, can reduce the cost of the obtained product, and can also obtain a mold with excellent accuracy and strength. It is in.

(Means for Solving the Problems) In order to solve the above-mentioned technical problems and also achieve the above-mentioned objects, the present invention covers the surface of a product shape of a model type with a conductive peeling film. The electroformed shell is formed by electroforming,
A formwork is directly set and fixed on the electroformed shell, and a low-shrinkage fluid filler is filled into the space between the electroformed shell and the formwork through a filler inlet formed in the formwork. The mold and the electroformed shell were solidified integrally and released from the model mold, and a sprayed layer for reinforcement was formed on the back surface of the electroformed shell.

(Embodiment) Next, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIGS. 1 to 13 are explanatory diagrams relating to the first invention of the present invention, and the first invention will be explained below in the order of steps.

Figures 1 to 6 show a method for manufacturing a female mold. A conductive release film (3) is formed on the surface (2), and the surface is covered with the film (3).

The model (1) is immersed in an electrolytic solution (5) in an electrolytic cell (0) as shown in Fig. 2, and the coating (3) of the model (1) is used as a cathode and exposed in the electrolytic solution (5). The electroformed shell depositing metal (B), nickel in the example, is used and maintained as an anode.This causes the coating (3) on the surface of the model (1) to
Nickel is precipitated on the outer surface of the electroformed shell (7) to a predetermined thickness, for example, a thickness determined based on the material and mold life of the object to be molded, specifically, 2 mm to 15 mm (7). Formed by depositing.

After molding the electroformed shell (7), model O) was taken out, and the resulting model is shown in FIG.

Arrange the above model (1) so that its electroformed shell (7) faces upward, set and fix the formwork (8) from above, and then
is equipped with a peripheral wall (801) and a top wall (ao2) and is opened downward, and is set and fixed on the peripheral edge of the electroformed shell (7) at the lower end of the peripheral wall (801), and the electroformed shell (7) and the formwork ( 8) Ribs (
803)..., and the top wall (802) also has a locking lip (
800, and a filler inlet (802) is provided on the top wall (802).
05) will be provided. This is shown in Figure 4.

The inlet (805) of the formwork (8) with the above set fixed
to low-shrinkage fluid fillers, such as cement and iron powder (
A filler (8) made by mixing iron powder (15% to 30%) or a filler made by adding iron filler (approximately 10%) to these to increase strength is flowed into the space (S) and filled, This is shown in Figure 5, and the filler (8) is solidified. As a result, the mold (8) and the electroformed shell (7) are integrated via the filler (8).

Next, the electroformed shell (7) is peeled off from the model (1), and the peeling is facilitated by the coating (3). The female mold (10) obtained by peeling is shown in FIG. The remaining end (+o2) folded back around the edge is screwed (to3), etc., and the filler (9) is attached to the lip (803).
), (804) to be firmly connected to the formwork (8).

7 to 12 show a method for manufacturing a male mold, in which a conductive peeling film (13) is formed on the surface (12) of the male mold model (11) as shown in FIG. 7, and then as shown in FIG. Gotoku Electrolytic Cell (14
) The model (11) is immersed in the electrolyte (15),
An electroformed shell (17) of a predetermined thickness is formed on the surface of the # to be used (13).

The obtained model (11) is taken out and a pipe (1
6), the pipe (1B) has a double structure in which a large diameter pipe (181) is fitted into the upwardly protruding portion of the shell (17). This is shown in FIG.

A formwork (
18) is fixed as a center, the formwork (18) has an H-shaped longitudinal section, and has a partition wall (182) in the middle of the peripheral wall (181),
A pipe (If71
) ends, IN, entry (+85) and RIP (18
3), (184), which is shown in FIG. 10, after which filler (19) is filled from the inlet (1115) and solidified, and then the model (! A similar type (20) was obtained, and a pipe (18) facing into the model (11) was obtained.
) is cut and removed because it protrudes from the mold surface (201).

Then, the remaining end (202) is screwed (203) or the like.

fi (IQ), (2 (1) obtained above are combined vertically to form a mold (30), the female mold (10) is used as the upper mold, the male mold (20) is used as the lower mold, Pass the ejector bin (31) through the described pipe (18).

FIGS. 14 to 17 show the second aspect of the present invention.

As described above, an electroformed shell (7) is formed on the surface of the model (1), and then, for example, Ni is low-temperature sprayed on the back surface (71) of the electroformed shell (7) to a predetermined thickness, specifically, A sprayed layer (40) of 5 to 30 layers is formed. This is shown in FIG. 14, where the sprayed layer (40) serves as a reinforcement backup for the electroformed shell (7).

The formwork (8) described above is set and fixed on the "-" of the above model (1), which is shown in Fig. 15, and then the filler (8) described above is set and fixed.
9) is injected and filled from the inlet (805), and this is injected into the 16th
As shown in the figure, the thermal spray layer (40) and the formwork (8) are integrated,
The model (1) is peeled off from the electroformed shell (7) to obtain a mold (50) as shown in FIG.

Such a mold (50) has excellent strength.

Although the embodiments of each of the inventions described above have shown press molds, FIGS. 18 to 420 show examples in which they are applied to synthetic resin molding molds.

Form an electroformed shell (7) on the surface of model (1) as described,
When setting and fixing the formwork (8), a nozzle member (6o) for injection of synthetic resin material is vertically set in the center, and the lower end (81) of the nozzle member (60) is vertically set in the electroformed shell (7). The injection passage (62) is opened to communicate with the surface of the electroformed shell (7). This is shown in FIG.

Subsequently, as described above, the filler (θ) is filled into the space and solidified to form the mold (8), the electroformed shell (7), and the nozzle member (60).
to integrate. This is shown in FIG.

A female mold (70) is obtained as described above, and a cavity (Sl) is formed by combining it with a male mold (8o), and a nozzle member (8o) is formed.
) is in communication with the cavity (Sl), and the synthetic resin material is supplied into the cavity (Sl).

Although the embodiment of only the electroformed shell of the first invention has been described above, it goes without saying that it can also be carried out with the reinforcing thermal sprayed layer of the second invention.

(Effects of the Invention) According to the present invention as detailed above, the mold can be easily manufactured without cutting or other machining, and the mold manufacturing schedule can be shortened since the mold can be manufactured in a short time. Because the model shape can be set arbitrarily and it can be manufactured by electroforming, it can be easily adapted to small-volume, multi-model production.In conjunction with the above, it is possible to reduce costs, and mold depreciation is possible in small-volume, multi-model production. It is also extremely advantageous, as it allows the production of fewer stitches while reducing the cost of the product, the weight of the mold can be reduced, which is advantageous when replacing molds, etc., and the molding surface can be formed with Ni etc. by electroforming. It is possible to obtain a product with excellent smooth surface precision and excellent product molding, and furthermore, according to the second invention, in addition to the above, strength and precision are further improved. is obtained.

The present invention has many advantages as described above.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIGS. 1 to 12 are explanatory diagrams showing the first invention of the present invention in the order of steps, FIG. 13 is an explanatory diagram of the obtained mold, and FIGS. FIG. 17 is an explanatory diagram showing the second invention of the present invention in the order of steps, and FIGS.
Figure 0 shows an example of a synthetic resin mold. In addition, (1) and (11) in the drawing are the model, (3) and (13)
is conductive release coating, (?), (17) is electroformed shell, (8)
, (18) is the mold, (9), (19) is the filler, (10)
, (20), and (50) are molds, and (40) is a sprayed layer. Patent applicant: Agent for Honda Motor Co., Ltd.
Patent Attorney Part 2 1) Part 1 Patent Attorney
Kuni Ohashi Patent attorney Koyama
Figure 1 Figure 2 JP-A No. 6L-30691 (5) Figure 10 JP-A No. 6L-30691 (6) Figure 12 Procedural amendment (voluntary) 21 Name of the invention Electroforming mold Manufacturing method 3, relationship with the case of the person making the amendment Patent applicant (532) Honda Motor Co., Ltd. 4, agent 5, daily publication of amendment orders Sponsorship 6, specification and drawings to be amended 7, content of amendment (1 ) The specification is amended as follows. a, Add the following between page 9, line 16 and line 17. ``Figure 21 shows a further modified example, in which a cooling pipe (21)... is arranged on the back side of the electroformed shell,
The cooling pipes (21) are embedded in the filler. ”b, page 1 O, line 20 is corrected as follows. FIG. 21 shows an example of an r type, and FIG. 21 is an example of one provided with a cooling pipe. (2) Add Figure 21 as attached. 8. List of attached documents

Claims (1)

[Claims] 1. A step of coating a product shape surface of a model mold with an electrically conductive release film; A step of forming an electroformed shell by electroforming on the electrically conductive release film; Directly on the electroformed shell. a step of setting and fixing the formwork; a step of filling a space between the electroformed shell and the formwork with a low-shrinkage fluid filler through an inlet formed in the formwork; and a step of filling the formwork with the filler. A method for manufacturing an electroforming mold, comprising the steps of: releasing a model mold from an integrally solidified electroformed shell; 2. A process of coating a conductive release film on the product shape surface of the model type, a process of forming an electroformed shell by electroforming on the conductive release film, and a reinforcing sprayed layer on the back side of the electroformed grain. a step of setting and fixing a mold; a step of filling a space between the electroformed shell and the mold with a low-shrinkage fluid filler through an inlet formed in the mold; 1. A method for manufacturing an electroforming mold, comprising the steps of: releasing a model mold from a mold and an electroformed shell that have been solidified as one body.