JP3046270B2 - Simple mold manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a simple mold manufacturing method,
In particular, the present invention relates to an improved simple mold manufacturing method for improving the accuracy of a mold and reducing the period and cost for manufacturing the mold.

[0002]

2. Description of the Related Art One of the methods for manufacturing a molded product is a method using a mold. For example, in the case of a product molded from a resin, it can be manufactured by pouring a resin in a molten state into a mold and curing the resin. One of the dies used to manufacture a molded product in this way is a simple mold formed of resin. A conventional simple mold manufacturing method for manufacturing a simple mold by performing mold transfer from a master model will be described below with reference to FIGS.

First, a master model 1 (hereinafter simply referred to as "master") 1 having the same shape as a molded product is manufactured (step 11). This is made by cutting the resin or laminating the resin. Subsequently, a parting board 2 matching this master 1 is produced (step 12). Parting board 2
Is manufactured by shaving out, for example, an acrylic resin while performing face matching with the master 1. In this example, the die corresponding to the core is a parting plate 2 (FIG. 4A). next,
The parting plate 2 on which the master 1 is mounted is fixed in the mold 3 and the resin 4 is injected from above (step 13, FIG. 4).
(B)). A cavity can be formed by curing and solidifying the injected resin 4. Next, after the resin 4 is solidified, the parting plate 2, the master 1, and the solidified resin 4 are turned over as a unit, and the parting plate 2 on the upper side is removed (step 14, FIG. 4C). Subsequently, a mold release agent is attached to the cavity formed by the solidified resin 4 remaining in the mold 3 and the master 1, and then the resin 5 is injected (step 15, FIG. 4D). A core can be produced by curing and solidifying the injected resin 5.

In this way, by removing the master 1 from the produced mold, a simple mold made of a resin material for producing a molded article having the same shape as the master 1 can be manufactured (FIG. 4E). ). Thereafter, after processing by a machine 6 such as a gate runner, assembly adjustment of the core and the cavity is performed so as to obtain a certain accuracy (FIG. 4F).

[0005] By the way, there has been a technique of paper shaping, which allows a master to be manufactured from paper. This involves printing the toner on a thin paper, laminating the paper further on the already laminated paper, and making cuts only in the required portion of the laminated paper, i.e., the toner-printed edges. The operations of printing the toner, laminating, and making a cut are repeated, and after the lamination of the paper is completed, only unnecessary portions of the paper are peeled off. The toner printed portion left by this peeling becomes a master. If this paper forming technology is used, the master can be manufactured at a lower cost and in a very short construction period as compared with the case where a resin is used because the material is paper.

[0006]

However, in the conventional mold manufacturing method, it is necessary to manufacture the master in the completely same shape as the molded product by cutting out the resin.
It takes a lot of time to pursue the accuracy of the shape. In addition, not only the master but also a parting board that matches the master must be manufactured while face-to-face matching, so that more time is required.

Conventionally, a master and a parting plate required for manufacturing a mold are made of resin. However, it is necessary to make the manufacturing cost of these members which are finally unnecessary less expensive. desired.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to improve the accuracy of a mold and to reduce the work period and cost for manufacturing a resin mold. It is to provide a mold manufacturing method.

[0009]

In order to achieve the above object, a simple mold manufacturing method according to a first aspect of the present invention provides a simple mold for manufacturing a simple mold by transferring a mold from a master model. In the mold manufacturing method, the master model and the parting plate are integrally formed so that they can be separated from each other.
Cut each at the boundary between the master model and the parting machine.
Producing a shaped article with cuts for separation , injecting a liquid first molding material into a mold frame to which the shaped article is fixed, solidifying the first molding material, and then solidifying the first molding material The first molding material and the molded article are turned over integrally, and only the parting plate portion of the molded article is cut in accordance with the cut.
After removing by separating , inject a liquid second molding material from above the first molding material and the master model fixed in the mold, and after solidifying the first molding material, By separating the first molding material and the second molding material and removing the master model, a simple mold composed of the first molding material and the second molding material Is to manufacture.

According to a second aspect of the present invention, there is provided a method for manufacturing a simple mold according to the first aspect, wherein the molded article is formed by laminating papers in a form in which a parting plate and a master model can be separated.

[0011]

Preferred embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a flow chart showing one embodiment of a simplified mold manufacturing method according to the present invention. FIG. 2 is a diagram showing a manufacturing process of a mold manufactured by the simple mold manufacturing method according to the present embodiment. In the present embodiment, a general resin is used as a material for molding each mold of a core and a cavity manufactured by performing mold transfer from a master.

A feature of the present embodiment is that a molded product in which a parting machine and a master are detachably integrated with each other is manufactured by effectively utilizing the paper molding technology. By using a paper molded product, the parting machine and the master can be manufactured at very low cost and in a short period of time.

Next, a method for manufacturing a simple mold according to the present embodiment will be described. In this embodiment, the shape of the master is the same as that of the conventional example.

First, the master 7a and the parting plate 7b are integrally formed of paper using a paper forming technique (step 10).
1). At this time, a cut is made at the boundary between the master 7a and the parting board 7b so that they can be separated. At this point, just cut and not cut. In the present embodiment, the die corresponding to the cavity is used as the parting disk 7b, but the die corresponding to the core may be used as the parting disk 7b.

Next, the paper molding 7 composed of the master 7a and the parting plate 7b is fixed in the mold 3 and the molten resin 5 is injected from above (step 102, FIG. 2 (b)).
A core can be produced by curing and solidifying the injected resin 5. Next, after the resin 5 is solidified, the resin 5 and the paper model 7 are turned over integrally. Then, only the paper corresponding to the parting board 7b is peeled off and removed from the paper modeled product 7 on the upper side (step 103, FIG. 2C). As described above, since a cut is made at the boundary between the master 7a and the parting board 7b of the paper model 7, only the part corresponding to the parting board 7b can be easily removed. Subsequently, after a mold release agent is adhered to the core formed by the solidified resin 5 remaining in the mold 3 and the master 7a, the resin 4 is injected (step 104, FIG. 2D). This injected resin 4
Is cured and solidified to form a cavity.

In this way, a simple mold made of a resin material for manufacturing a molded article having the same shape as the master 7a can be manufactured by separating the manufactured core and cavity and removing the master 7a (see FIG. 1). FIG.
(E)). Then, after processing by the machine 6 such as a gate runner, assembly adjustment of the core and the cavity is performed so as to obtain a certain accuracy (FIG. 2 (f)).

According to the present embodiment, the master and the parting machine can be separated and integrally formed so as to be able to be cut off, so that the operation of manufacturing members (master and parting machine) required for simple die manufacturing can be reduced and the master and the parting machine can be separated. The step of aligning with a parting board becomes unnecessary. For this reason, the accuracy of the simple mold is improved,
In addition, since the core and the cavity are manufactured by the same master, the burden on assembly adjustment can be reduced.

Further, by forming the integrated master and parting board into a paper model, the master and parting board can be manufactured inexpensively and in a short period of time.

As described above, in the present embodiment, the time required for the operation in some steps for manufacturing the mold can be reduced.

In the present embodiment, integral molding is performed while making a cut between the master and the parting plate, but this can be easily designed and manufactured by using the current three-dimensional CAD. Original data can be generated. In addition, paper modeling can be easily performed according to the original data.

Further, in this embodiment, the molded article composed of the master and the parting plate is produced by using the paper molding technique which can be produced relatively inexpensively and in a short period of time. As long as it can be molded, it does not need to be a paper molded article.

In this embodiment, a resin that is often used as a simple mold is used as a material for the mold. The resin is solidified by being left and cured for several hours under predetermined curing conditions.
The material need not be a resin as long as it is a material that is solidified by applying a solidifying agent and the like and can be used as a mold. Further, in this embodiment, the first and second molding materials are made of resin, but are not limited to the same material.

In the present embodiment, the case where the first mold is a core and the second mold is a cavity has been described.
The reverse is also possible.

[0025]

According to the present invention, since the cutting board and the master model are integrally formed so as to be separable without being separately manufactured, the manufacturing time for these can be shortened, and the surface of the master model and the cutting board can be reduced. A matching step is not required. For this reason,
The burden on assembling and adjusting the first mold and the second mold constituting the simple mold can be reduced, and the accuracy of the simple mold can be improved.

Further, since the molded article is manufactured by laminating paper, it can be manufactured inexpensively and in a short period of time.

[Brief description of the drawings]

FIG. 1 is a flowchart illustrating an embodiment of a simplified mold manufacturing method according to the present invention.

FIG. 2 is a diagram showing a manufacturing process of a mold manufactured by the simple mold manufacturing method in the present embodiment.

FIG. 3 is a flowchart showing a conventional simple mold manufacturing method.

FIG. 4 is a view showing a manufacturing process of a mold manufactured by a conventional simple mold manufacturing method.

[Explanation of symbols]

3 formwork, 4,5 resin, 6 machine, 7 paper model, 7
a Master model, 7b Parting board.

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-61-137710 (JP, A) JP-A-59-150742 (JP, A) JP-A-9-309113 (JP, A) JP-A-3-3 258513 (JP, A) JP-A-4-142910 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B29C 33/38-33/40

Claims (2)

(57) [Claims] 1. A simple mold manufacturing method for manufacturing a simple mold by transferring a mold from a master model, wherein the master model and the parting plate are formed integrally.
At the border between the master model and the parting board
Prepare a shaped article with cuts to separate them, inject the liquid first molding material into the mold frame to which the shaped article is fixed, after solidifying the first molding material, The solidified first molding material and the molded article are turned over integrally, and only the parting plate portion of the molded article is cut off according to the cut.
After being removed by the above, the liquid second molding material is injected from above the first molding material and the master model fixed in the mold, and after solidification of the first molding material, By separating the first molding material and the second molding material and removing the master model, a simple mold composed of the first molding material and the second molding material is obtained. A simple mold manufacturing method characterized by manufacturing. 2. The method according to claim 1, wherein the molded article is formed by laminating papers in a form that allows a parting plate and a master model to be separated.