JPS59220230A - Manufacture of press die - Google Patents

Abstract

PURPOSE:To eliminate necessity of machining of positioning concavity of a die by forming a bulged part made of brittle material and having the same shape with concavity for positioning etc. on the thermal spray side, and after separation from the die, removing the bulged part and obtaining desired concavity. CONSTITUTION:A metallic thermal spray layer 2 is formed on a thermal spray model 1 manufactured from a basic model. Further, a bulged part 10 made of brittle material is formed. The thermal spray layer 2 and bulged part 10 are backed with resin 3 etc. and the body 4 of a die made of cast iron etc. is stuck fast to this to obtain a die 11. Then, the die 11 is separated from the model 1 to transfer the surface form of the model 1 to the die 11. The bulged part 10 is destructed together with the thermal spray layer 2 by a hammer etc. to obtain a positioning concavity 6. In the case where the die 11 is used as an upper die, a lower die is formed similarly and a projection that fits to the concavity 6 is provided and the two is fitted together. Thus, it becomes not necessary to machine a positioning concavity and manufacture of the die becomes easy and quick.

Description

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

Recently, there are the following manufacturing methods for manufacturing molds for manufacturing non-contracted parts.

This method first starts with a basic model, as shown in Figure 1 (A), and then a thermal spray model 1 using plaster, resin, or low melting point alloy.
A thermal spray layer 2 is formed by thermally spraying metal onto the surface that will become the surface of the press 5.

Next, this rFj radiation layer 2 is lined with concrete, sand core, resin 3, etc., as shown in FIG. 1(B), and a mold body 4 made of cast iron or the like is adhered thereto.

Furthermore, when the mold 5 formed in this manner is released from the thermal spray model 1, a mold surface shape that is an inversion of the surface shape of the thermal spray model 1 is obtained. As shown in FIG. 1(C), recesses 6 such as four positioning portions are formed, and the mold is finished.

With this method, the surface of the sprayed model 1 can be easily reproduced in the sprayed layer 2, eliminating the need for the troublesome manual finishing work required to finish the press mold, thereby shortening the mold manufacturing period and reducing mold manufacturing costs. It has the practical advantage of being able to achieve

However, according to this method, when forming the recess 6, the cutter 8 is used to cut the sprayed layer 2. Since it is necessary to machine the resin 3 and the mold body 4 and remove unnecessary material, there is a disadvantage that the above-mentioned advantages are reduced by the time and cost of performing this machining.

The present invention has been made in view of the above points, and provides a method for manufacturing a press mold that eliminates the machining process that detracts from the advantages of the press mold manufacturing method, and enhances and overcomes the advantages. Its purpose is to
A bulging part made of a brittle material and having the same shape as the four positioning parts is molded on the thermal sprayed model, and after the above mold release, this bulging part alone or together with the thermal sprayed layer covering this bulging part is molded. The present invention is characterized in that the recessed portion is formed by removing the portion.

Hereinafter, one embodiment of the method of the present invention will be explained with reference to the drawings.

Figures 2 (△) to (]3) are cross-sectional views showing an example of the method of the present invention in the order of steps, and the same parts as those shown in Figures 1 (A) to (C) are designated with the same number. It has been MJ.

First of all, Fig. 2 (△) shows that melt r71 is applied to the surface of the sprayed layer del 1.
This shows the state in which layer 2 has been formed. This thermal spray model 1 was manufactured from the basic model, has a surface to be transferred to the mold, and is made of resin or low melting point metal. There is.

This thermal spray model 1 is a thermal spray layer of soil and 2 is a thermal spray metal! By doing so, the surface shape of the solvent model 1 is transferred to the surface thereof.

Up to this point, the conventional method is the same.

However, in the method of the present invention, a bulge 1o is formed on the thermal spray model 1 side in order to form the four positioning parts 6, etc., as shown in FIG. 2(B).

This bulge 10 has the same shape as the recess 6 and is made of a brittle material.

This swollen portion 10 may be made of, for example, clay foam.

Constructed from fragile materials such as wood, Jruno c3 construction, this gold 31
After manufacturing 7, this bulging part 1o and this bulging part 10
@This is to allow the covering thermal sprayed layer 2 to be easily collapsed using a hammer etc., and to allow the recess 6 resulting from step (a) to be easily used as the positioning recess etc. described above. be.

Furthermore, as shown in FIG. 2(C), the sprayed layer 2 and the bulging portion 10 are lined with a resin 3 or the like, and a mold body 4 made of cast iron or the like is fixed thereto.

After this same process, if this mold 11 is peeled off from the melt Q4 [Del 1], as shown in Fig. 2 ([)], the surface of the mold 11 has the surface of the melt Q4 model 1 inverted. The shape will be transferred.

Finally, using a hammer or the like, the bulge 10 made of the brittle material is collapsed together with the sprayed layer 2 covering the bulge 10.
rJ, the positioning four parts 6 as shown in FIG.

Uses fragile materials such as wood! It is extremely easy to disintegrate with a hammer or the like, and the work of forming the four parts 6 can be done more quickly and easily than with conventional machining. Therefore, iI? Since the complicated and troublesome machining process can be abolished, the advantages of the press mold manufacturing method in which the thermal sprayed layer 2 is formed on the thermal sprayed layer delta, such as shortening the manufacturing period and reducing manufacturing costs, are not lost in any way. Never.

As shown in FIG. 3, which corresponds to the plan view of FIG.
Completed as a cover.

If this mold 11 is to be used as a sea urchin upper mold, for example, as shown in FIG. 11a is molded,
This lower mold 11a (the same member as the upper mold side is given the same reference numeral and a suffix a) has a positioning protrusion 12 that fits into the recess 6 11n projected from the mold body 4. is uneven 1
The press mold is completed by configuring them so that they fit together.

In the above-mentioned embodiment, as is clear from FIG. 2(B), the sprayed layer 2 is formed on the sprayed model 1, and the bulge 10 is erected on the -. Accordingly, as shown in FIG. 5, a bulge 10 may be provided directly on this basic UO>-rule 1, and a thermal spray layer 2 may be formed thereon.

As is clear from the above explanation, according to the method of the present invention,
A bulging part as an unstable interior is formed in advance on the melt OA'E del side using a fragile U size, and after this mold is released, this bulging part 10 is formed by thermal spraying that covers only this bulging part or this bulging part. Since this bulge is removed along with the layer and the four positioning parts are formed, there is no need for conventional machining, making mold production extremely easy and quick. It is possible to reduce the manufacturing cost of the product, which is extremely effective.

[Brief explanation of drawings]

In Fig. 1, (Δ) to (C) are iJ sectional views showing an example of the conventional press mold manufacturing method in the order of steps, and Fig. 2 (A,) to ([) show an example of the method of the present invention in -[culm order]. The cross-sectional view shown in Fig. 3 was prepared by the same method], and the yielded gold 51! Fig. 4 is a cross-sectional view showing a state in which the upper mold and lower mold are matched, Fig. 5 is a plan view of (
FIG. 3 is a side view showing another embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Thermal spraying t-del, 2... Thermal spraying layer, 3... Resin, 4... Mold body, 6... Recessed part, 7... Unnecessary inside, 8... Cutter, 10. ...bulge,
11... Mold, 12... Positioning protrusion. Figure 1 (C) Figure 2 (A) (B) (C) (D) (E) Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] A sprayed layer formed by spraying metal on the surface of a sprayed model formed from a basic model is lined with a backing material, and after the sprayed model is released from the mold, unnecessary internal parts are removed to form four parts such as positioning. In the press mold manufacturing method, a bulging part having the same shape as the recess and made of a brittle material is formed on the thermal spraying model, and after the 111ffi, the thermal spraying is carried out only on this bulging part or covering this bulging part. A method for manufacturing a press die, characterized in that the bulge is removed along with the layer to form the recess.