JPS58110138A - Production of press die - Google Patents

Abstract

PURPOSE:To form a highly accurate flame spraying layer on a model surface to give toughness to the surface by arranging cylindrical members on the model surface, flowing Shaw slurry into the fence surrounding the model surface to solidify the slurry and injecting a reinfrocing material into a hollow part excludig the cylindrical members. CONSTITUTION:The Shaw slurry 5 is allowed to flow into the fence 4 surrounding the external periphery of a basic model 3 and the cylindrical members 6 are inserted into the slurry 5. Subsequently, the cylindrical members 6 are pulled out to form the hollow part, the basic model 3 and the fence 4 are removed and the remaining slurry 5 is burned to make a ceramic die 5a. A synthetic resin 10 is injected into the hollow part of the ceramic die 5a as a reinforcing material and a reinforcing plate 12 is adhered to a synthetic resin layer 11 and the synthetic resin layer 11 is adhered to the injecting die side to complete a flame spraying model 13. After forming the flame spraying layer 14 by flame-spraying a hard metal into the model, a backing material 15 such as sand core is backed from the back of the model surface and the flame spraying model 13 is removed to complete a press model. Thus the upper and lower dies are prepared.

Description

[Detailed description of the invention] The present invention relates to a method for manufacturing a press mold.

There is a method for manufacturing press molds for mass production of confections called the full mold method, in which a mold with approximately the same shape as the desired press mold is formed using foamed sterol, etc. Fill the mold with molding sand to create a mold. By pouring the metal into this mold, the styrofoam portion is vaporized before casting, and as a result, the portion corresponding to the styrofoam is cast. Then, the part of the casting that will become the press mold surface is cut using an NC machine tool or the like, and then manually finished to form a press mold.

However, this method requires manual finishing after cutting, which increases the production period and costs.

On the other hand, in order to shorten the manufacturing period for prototype press molds, which limit the number of panels that can be molded to some extent, zinc alloy is used or the surface of the zinc alloy is coated with epoxy resin to form the press mold.

However, such press molds are not durable and
There was also a problem in that the dimensional accuracy of the pressed product was poorer than that of the mass-produced product.

In order to solve these problems, a method of manufacturing a press mold as shown in FIG. 1 has been proposed. That is, first, a thermal spraying model 1 for thermal spraying is made of gypsum 2 synthetic resin or a low melting point alloy, and a thermal spraying layer 2 is formed by thermally spraying metal onto the surface of the model. Then spray a layer of concrete.

Line it with sand core, synthetic resin, etc. and make it into a press mold.

The advantage of this method is that the surface of the sprayed model can be completely reproduced with the sprayed layer, so there is no need for manual finishing after making it into a press mold, thereby shortening the production period and reducing production costs. Can be done.

However, according to this method, 1. For example, if the thermal spray model is made of plaster or synthetic resin, the crystal water of the plaster may splash out during thermal spraying, or the components of the synthetic resin may evaporate and leak out, causing the thermal spray layer to form on the surface of the thermal spray model. A cavity was created between the two, which caused the problem that the sprayed layer would swell or swell.

In addition, when a thermal spray model is made of a low melting point alloy, the low melting point alloy is heavy, making it difficult to work with, and the production cost is high because it is expensive. Because of this tendency, small shapes such as letters cannot be conveniently formed into the sprayed layer. Furthermore, if you try to heat and melt a low melting point alloy model after lining it, the lining material will also be heated, so in order to prevent the lining material from deforming due to the heat from the cutting edge, the lining material must be heat resistant. It becomes necessary to choose.

The purpose of the present invention is to solve the above-mentioned problems, by providing a columnar member in the space formed on the model surface of the basic model, and pouring and solidifying the show slurry. By using a thermal spray model formed by injecting reinforcing material such as a synthetic resin into the hollow part and curing it, it is possible to form a highly accurate spreading layer on the model surface of the thermal spray model. It is characterized by the fact that the brittleness of ceramic is supplemented by a reinforcing material such as synthetic resin injected into the cavity formed in the ceramic mold, giving it toughness.

The present invention will be described in detail below with reference to the drawings.

FIG. 2 (&) shows a state in which the outer periphery of the basic model 3 made of gypsum 1 synthetic resin or low melting point metal is surrounded by a fence 4, and the show slurry 5 is poured into the fence 4. Shaw slurry 5 is a mixture of Al2O2, ZrO2, and Si02-based powders with low thermal expansion coefficients and high refractory properties, with ethyl silicate added as a binder.
It can be poured immediately in response to the surface shape of the basic model 3.

FIG. 2(b) shows the process of arranging columnar members 6 at appropriate intervals in the show slurry 5. ing. The process of standing up the columnar members 6 may be performed before the show slurry 5 is poured, and the show slurry 5 may be poured thereafter.

Figure 2 from show slurry 5 solidified within fence 4 (
As shown in C), the columnar member 6 is removed to form a cavity 9.

From the show slurry 5 in which the cavity 9 is formed, FIG.
), the basic models 3 and 7 faces 4 are removed and fired in a firing furnace (not shown) to form a ceramic mold 5a.

FIG. 2(e) shows a step of casting a synthetic resin 10 as a reinforcing material into the cavity 9 of the fired ceramic mold 5a and forming a synthetic resin layer 11 on the side surface of the casting. The reinforcing material does not need to be made of synthetic resin, and any suitable material can be selected.

FIG. 2(f) shows the process of bonding the reinforcing plate 12 to the synthetic resin layer 11, thereby completing the thermal spray model 13.

If necessary, water glass may be applied or impregnated on the model surface of this thermal sprayed model 13. By doing this, the roughness of the model surface peculiar to ceramics can be smoothed, and the model surface can be coated with water glass as described below. Improve the formation condition of the sprayed layer formed by

In the above steps, the synthetic resin 1 is filled into the cavity 9 of the ceramic mold 5a.
The reason for casting 0 is that although ceramic is light and heat resistant, it is brittle and may break during the process of thermal spraying, which will be described later, on the model surface. Therefore, by casting the synthetic resin 10 into the cavity 9, it is possible to impart toughness to the entire structure so that it will not break under the slightest impact.

Figure 2 (X)
As shown in (a hard metal such as Cr is thermally sprayed to form the thermal spray layer 14. Since the thermal spraying temperature is high and the thermal spray model 13 is made of ceramic, crystal water may come out from the thermal spray model 13 or other problems may occur). The components do not thermally decompose and fly out, and the formation of the sprayed layer 14 is not adversely affected.

After forming the sprayed layer 14, as shown in FIG. 2(h), a backing material 15 such as synthetic resin, sand core, or concrete is lined from the back side of the model surface. 4. Next, as shown in FIG. 2(i), the thermal spray model 13 is removed, and the press mold is completed.

In this way, as shown in FIG. 2(j), an upper mold and a lower mold are prepared, and a material 16 such as iron or non-ferrous metal is molded as a completed mold.

Further, although not shown, it can be similarly produced as a shear type.

As described above, according to the method for manufacturing a press die according to the present invention, when creating a thermal spray model, a columnar member is placed in show slurry and solidified, a cavity is created by removing the columnar member, and then By firing it into a ceramic mold and casting a reinforcing material into the cavity, it is possible to supplement the brittleness of ceramic and create a tough thermal sprayed model, which has resistance to impact and is easy to handle. Become.

Further, it has the advantage that it can sufficiently withstand the residual shrinkage stress of the sprayed layer, has a higher resistance to residual shrinkage stress than a sprayed model made only of ceramics, and can manufacture molds with high precision.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a conventional thermal spraying model, and FIG. 2 is a process diagram showing a method for manufacturing a press mold according to the present invention. 3...Basic model 5...Show slurry 6...
・Column member 8...Jig 9...Cavity part 10...
・Synthetic resin as a reinforcing material cast into the cavity 13.
・Thermal spraying model 14...Thermal spraying layer 15...Backing material procedure amendment (method) May 1980 1981 Haruki Shimada, Commissioner of the Patent Office 1. Indication of the case 1982 Patent Application No. 208658 2. Invention Name Manufacture of press molds, Method 3, and relationship to the amendment case Patent applicant address 2, Takaracho, Kanayō-ku, Yokohama, Kanagawa Prefecture Name
(399) Nissan Motor Co., Ltd. 38”) Representative
Shun Ishihara 4, Deputy Director 5, Date of amendment order April 27, 1981 Father-in-law 2 2(i)(j)

Claims (1)

[Claims] 1. Spray metal on the surface of the sprayed model formed from the basic model to form a sprayed layer, line the sprayed layer with a backing material, and then separate the sprayed model and the sprayed layer to create a press mold. In the method, a columnar member is provided in a space formed on the model surface of a basic model, and Shaw slurry is poured and solidified, the columnar member is removed, and a reinforcing material is injected into the cavity formed by the columnar member and hardened. A press mold manufacturing method characterized by the use of a thermal spray model.