JPH0234232A - Manufacture of press die and sheet member used therefor - Google Patents

Abstract

PURPOSE:To form a melt-sprayed layer of enough thickness keeping releasing property and inversion property in a good state by sticking a sheet member provided with a non-slip layer of melt-sprayed metal on a reference model and forming a metallic melt-sprayed layer on it. CONSTITUTION:A sheet wax 2 is stuck on the reference model 1. On one side of the sheet wax 2 is provided a non-slip layer 8 in which metal powder 7 is contained. The upper surface of the sheet wax 2 is coated with release agent and melt-sprayed to form a metallic melt-sprayed layer 3. Since the melt-sprayed metal collides with and adheres to the metal powder 7, it does not slip on the sheet wax 2 and obtains an enough thickness. The surface of the metallic melt-sprayed layer 3 is coated with adhesive and backing material 5 is cast. The reference model 1 is removed to obtain a punch P. A die is obtained which is excellent in inversion property, free from adhesion of foreign matters and has a metallic melt-sprayed layer of enough thickness.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention provides a method for forming a metal spray layer by pasting a sorting member on a mold surface such as a reference model and forming a metal spray layer directly on the sheet member. This paper relates to an improvement in a method for manufacturing a press mold having a press mold in a short time and at low cost, and an improvement in a sheet member used for manufacturing the press mold.

[Prior art] A reference model with a mold surface corresponding to the shape of a press-formed plate (object to be formed) is made of plaster, etc., and a punch die and a gouer die corresponding to the shape are made using the reference model. A press mold manufacturing method is generally known, in which a metal spray layer is formed on the mold surface and a backing material such as concrete is cast. 50
(See Publication No. 1960).

Conventionally, in the manufacturing method of such a press mold, for example, a sheet wax (sheet member) having a thickness corresponding to the thickness of the press plate is pasted on a predetermined reference model, and plaster is applied on the sheet wax. After forming an inverted reference model by casting and forming a metal sprayed layer on the inverted reference model, a backing material such as concrete is cast on the metal sprayed layer and a predetermined amount of gold is formed. He was making a mold.

However, in this method of manufacturing press molds, it is necessary to manufacture two reference models, a reference model and an inverted base model, which leads to problems such as a longer production time and higher production costs. there were.

Therefore, a metal sprayed layer was formed directly on the sheet wax-E pasted on the reference model, and the backing material of the metal sprayed layer was cast to produce a press mold, and the manufacturing process of the inverted reference model was completed. A method of manufacturing a press mold has been proposed in which the time required for manufacturing the press mold and the manufacturing cost are reduced by eliminating the press mold.

[Problems to be Solved by the Invention] However, in the above-mentioned conventional press mold manufacturing method in which a metal sprayed layer is directly formed on the sheet wax pasted on the reference model, the metal sprayed on the sorting wax is Since it is extremely slippery, it is not possible to form a metal sprayed layer to a sufficient thickness, resulting in a problem in that the strength of the press die produced is reduced. Therefore, a method of manufacturing a press mold has been proposed in which an adhesive is applied to the surface of the sheet wax to prevent the sprayed metal from slipping and to form a thick sprayed metal layer. Although a sprayed metal layer with a predetermined thickness is formed on the sheet wax, the adhesion force of the adhesive causes insufficient releasability between the sprayed metal layer and the sheet wax, resulting in extremely poor reversibility of the press mold. The problem was that it was getting worse.

The present invention has been made in view of the above-mentioned conventional problems, and includes forming a metal sprayed layer directly on the sheet wax pasted on the reference model (2. Casting a backing material on the metal sprayed layer). We started manufacturing press molds by
In the press mold manufacturing method, the metal spraying layer is sprayed to a sufficient thickness on the sheet wax while ensuring sufficient mold releasability between the metal spray layer and the sheet wax to maintain good reversibility of the press mold. It is an object of the present invention to provide a method for manufacturing a press mold that can form a layer, and a sheet wax (sheet member) used therein.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a method for manufacturing a press mold having a metal sprayed layer using a reference model.
A sheet member heather is formed on a reference model, and has an anti-slip layer formed on one side to prevent the thermal sprayed metal from slipping, the thickness of which corresponds to the thickness of the object to be formed, and the above-mentioned anti-slip layer is the reference model. After pasting the sheet member so that it is located on the opposite side, a metal sprayed layer is formed on the sheet member, and a backing material is cast on the metal sprayed layer.The reference model is removed and the press mold is placed. A method for manufacturing a press mold is provided. Furthermore, in the sheet member pasted on the reference model in accordance with the thickness of the object to be formed,
To provide a sheet member characterized in that an anti-slip layer is formed on one side to prevent a thermal sprayed metal from slipping.

[Operations and Effects of the Invention] According to the present invention, the side of the sheet wax (sheet member) on which the metal spray layer is formed contains, for example, metal powder,
Since an anti-slip layer is formed to prevent the thermal sprayed metal from slipping on the sort wax, the metal sprayed onto the sheet wax will not adhere or fuse to the components of the anti-slip layer, such as metal powder, etc. during thermal spraying. do. Since the components of the anti-slip layer (metal powder, etc.) are held relatively firmly on the sheet wax, the sprayed metal that has adhered or fused to the components of the anti-slip layer (metal powder, etc.) is also attached to the sheet wax. Relatively strong retention on sheet wax. This prevents the sprayed metal from slipping on the sheet wax, allowing a thick metal sprayed layer to be formed on the sheet wax, and eliminating the need to apply adhesive between the sheet wax and the metal sprayed layer. do not have. Therefore, a metal sprayed layer of a predetermined required thickness is formed on the sheet wax while ensuring sufficient mold releasability between the metal sprayed layer and the sheet wax and maintaining good reversibility of the press mold. This makes it possible to improve the reliability of the press mold.

[Example] Examples of the present invention will be specifically described below.

FIG. 2 is a diagram showing the manufacturing process of a punch mold by the press mold manufacturing method according to the present invention. Hereinafter, each process of the punch die manufacturing method will be explained.

Step a: After cleaning the mold surface of the Gui-shaped reference model 1 with a predetermined cleaning liquid to remove oil, a mold surface is coated onto the mold surface to a thickness corresponding to the thickness of a press-formed plate (not shown). Paste sheet wax 2 prepared in advance.

Note that the sheet wax 2 corresponds to the sheet member described in the claims of the present application. In this embodiment, the reference model 1 uses a Goui mold that has already been manufactured in the Goui mold manufacturing process (not shown), but sheet wax 2 is applied to the reference model made of plaster. Of course, the present invention can also be applied to the production of a predetermined press mold. The sheet wax 2 is, for example,
It begins to soften at about 90℃, completely softens at about 120℃, and
The main component is a common paraffinic material that melts at 50°C.

As shown in an enlarged view in FIG. 1, one side of the sheet wax 2 has a predetermined thickness mixed with a predetermined metal powder 7, such as 5O9 (stainless steel) powder, iron powder, etc. An anti-slip layer 8 is formed. The sheet wax 2 is pasted onto the reference model I such that the surface on the anti-slip layer 8 side is located on the opposite side to the reference model 1.

When the metal powder 7 is thermally sprayed onto the sheet wax 2, as will be explained later, it adheres or fuses to the sprayed metal to prevent it from slipping. The particle size of the metal powder 7 is preferably 10 μm or less, and the thickness of the anti-slip layer 8, that is, the depth of the metal powder 7 mixed from the surface of the sheet wax 2, is preferably 50 to 100 μm. .

Note that instead of dispersing the metal powder 7, a metal foil may be pasted on the sheet wax 2 to form the anti-slip layer 8.

As shown again in FIG. 2 (step a), the reference model 1 and the punch mold P (
A polyvinyl alcohol aqueous solution is applied as a mold release agent to promote mold release between the sheet wax 2 and the metal sprayed layer 3 during separation (see step e).

Process b...Standard model! A metal sprayed layer 3 is formed on the surface of the sheet wax 2 pasted on top, but in order to increase the adhesion between the sheet wax 2 and the metal sprayed layer 3,
First, a low melting point alloy mainly composed of zinc or the like is thermally sprayed onto the sheet wax 2 to form an undercoat having a thickness of 20 to 30 μm, and then 13% chromium is applied to increase the durability of the metal thermal sprayed layer 3. A high melting point material such as steel or 0.8% carbon steel is sprayed. In this way, the metal sprayed layer 3 is formed on the sheet wax 2. As mentioned above, the metal sprayed on the sheet wax 2 is the metal powder held on the surface of the sheet wax 2 or in the vicinity thereof. Since the sprayed metal collides with the sheet wax 7 and adheres or fuses thereto, the sprayed metal does not slip on the sheet wax 2, and therefore, a sufficiently thick metal sprayed layer 3 is formed on the sheet wax 2. In addition, in order to ensure the specified durability of the punch die P, approximately 30
The metal sprayed layer 3 is required to have a thickness of 0 μm or more.

Step C: On the surface of the metal sprayed layer 3 formed via the sheet wax 2 on the mold surface of the reference model 1, the metal sprayed layer 3 and the backing material 5 to be cast in the next step d are placed. Apply adhesive to strengthen the bond.

Step d: On the metal sprayed layer 3 on the reference model l,
A predetermined frame (not shown) is provided, and a backing material 5 made of concrete or mortar is cast.

Step e: After the backing material 5 is solidified, a force is applied to the reference model 1 and the backing material 5 in a direction to separate them from each other, and the backing material with the metal sprayed layer 3 is removed from the reference model 1. 5 is removed and used as a punch mold P.

In this way, the test results of the thickness and reversibility of the metal sprayed layer of the two types of press molds manufactured according to the present invention (Example 1 and Example 2) and the three types manufactured using the conventional manufacturing method are shown. Similar test results for press molds (Comparative Examples 1 to 3)
) are shown in Table 1.

The manufacturing methods of Comparative Examples 1 to 3 in Table 1 are as follows.

Comparative Example 1> After applying a mold release agent on a conventional sheet wax that has not been surface treated, undercoat with a low melting point alloy,
Furthermore, 13% chromium steel is thermally sprayed.

<Comparative Example 2> After coating a mold release agent on conventional Sea I wax without surface treatment, undercoating with a low melting point alloy, and then thermally spraying 0.8% carbon steel.

Comparative Example 3: After applying an adhesive to enhance the adhesion of the metal sprayed layer on a conventional sheet wax that had not been surface-treated, it was undercoated with a low melting point alloy, and then 13% chromium steel was sprayed. thing.

As is clear from Table 1, according to the present invention, in both Example 1 where the high melting point material was 13% chromium steel and Example 2 where the high melting point material was 0.8% carbon steel, both metal The thickness of the sprayed layer was equal to or greater than the target value of 300 μm, and the reversibility was good.

On the other hand, in Comparative Examples 1 and 2, although the reversibility was good, the thickness of the metal sprayed layer did not reach the target value of 300 μm.

In addition, in Comparative Example 3, the thickness of the metal sprayed layer was over the target value of 300 μm due to the effect of the adhesive, but the reversibility deteriorated due to the influence of the adhesive, and the adhesive adhered to the press mold surface. There is.

As described above, in all of the comparative examples, the press mold was judged to be poor, but in Example 1.2 according to the present invention, the judgment was good. Therefore, according to the invention:
To form a sufficiently thick metal sprayed layer 2 on the sheet wax 2 while ensuring sufficient mold releasability between the metal sprayed layer 3 and the sheet wax 2 and maintaining good reversibility of the press mold. This makes it possible to improve the reliability of the press mold.

[Brief explanation of the drawing]

FIG. 1 is an explanatory cross-sectional view of a sorting wax in which an anti-slip layer is formed by dispersing metal powder near the surface on the opposite side of the reference model. FIG. 2 is a diagram showing the manufacturing process of a press mold by the manufacturing method according to the present invention. P... Punch type, 1... Standard model, 2... Sheet wax, 3... Metal sprayed layer, 5... Backing material,
7... Metal powder, 8... Anti-slip layer.

Claims (2)

[Claims] (1) In a method for manufacturing a press mold having a metal sprayed layer using a reference model, the reference model has a thickness corresponding to the thickness of the molded object and has a slip of the sprayed metal on one side. After pasting a sheet member on which an anti-slip layer is formed such that the anti-slip layer is located on the opposite side of the reference model, a metal spray layer is formed on the sheet member, and the metal spray layer is further applied. A method for manufacturing a press mold, characterized in that after casting a backing material on the layer, a reference model is removed to manufacture a press mold. (2) A sheet member that is pasted on a reference model in accordance with the thickness of a molded object, characterized in that an anti-slip layer is formed on one side of the sheet member to prevent the thermal sprayed metal from slipping.