JPH0739964A - Manufacture of metallic die - Google Patents

Abstract

PURPOSE:To shorten the manufacturing time of a metallic die by abbreviating wiring processes. CONSTITUTION:This manufacturing method is provided with a first process for forming the final product shape 1 of a formed article by a three dimensional CAD, a second process for preparing the CAD data of a shape model which is equivalent to the model corresponding to the final product shape by inverse- operating the shape data concerning the final product shape 1, a third process for shaping the real shape model based on the CAD data of the shape model, and a fourth process for manufacturing an electric discharge master by using as a female die the real shape model which has been shaped in the third process, pouring a molten electrically conductive body into the die while cooling the circumference, and solidifying it. Thus, the metallic die is manufactured by means of this electric discharge master.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold manufacturing method,
More specifically, the present invention relates to a mold manufacturing method that shortens the manufacturing time.

[0002]

2. Description of the Related Art In the conventional die manufacturing method, machining such as roughing and finishing is used for basic shapes, and electric discharge machining is used for deep groove shapes where it is difficult to use tools. ing. An electric discharge master such as a graphite electrode or a copper electrode is used for electric discharge machining. This discharge master designs the shape separately for the parts that cannot be machined in the mold,
Manufactured by machining. Then, the final product shape data of the three-dimensional CAD is corrected according to the plurality of discharge masters, and NC data for machining the die is created.

[0003]

As described above, the conventional mold manufacturing method requires the steps of designing the discharge master, examining the combination of the discharge master and NC data, and creating the NC data. Therefore, there is a problem that it takes a long time (for example, 3 months) from the reception of the final product shape data to the completion of the mold manufacturing.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a mold manufacturing method capable of improving the disadvantages of the conventional example and significantly shortening the mold manufacturing time.

[0005]

In the present invention, a three-dimensional CA is used.
First step of forming a final product shape of a molded product by D, and CAD data of a shape model corresponding to a mold corresponding to the final product shape by reversing the shape data according to the final product shape And a third step of forming an existing shape model based on the CAD data of this shape model, and the existing shape model formed in this third step is used as a female mold. A fourth step of manufacturing a discharge master by injecting and solidifying a molten conductor into the interior while cooling the periphery, and a fifth step of forming a mold by the discharge master.
Is adopted. This aims to achieve the above-mentioned object.

[0006]

The reverse shape of the final product is created by creating a reverse shape on the CAD by offsetting using the three-dimensional CAD data, and curing the photo-curable resin with a laser by the stereolithography method. Subsequently, this is used as a female mold to manufacture a discharge master. This eliminates the steps of designing the discharge master, examining the combination of the discharge master and NC data, and creating NC data. A mold is manufactured with this discharge master.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. The examples shown in these figures are three-dimensional C
A first step of forming a final product shape of a molded product by AD;
Based on the CAD data of this shape model, the second step of creating the CAD data of the shape model corresponding to the mold corresponding to the final product shape by reversing this based on the shape data of the final product shape. And a third step of forming an existing shape model, and using the existing shape model formed in the third step as a female mold, the molten conductor is injected and solidified while cooling the surroundings. And a fourth step of manufacturing a discharge master by
The method of making a mold by this discharge master is adopted.

Here, in the above-mentioned third step, the CAD data of the shape model is sliced, the photo-curing resin is cured by laser light by the stereolithography method, and then the same process is performed while moving downward by 100 microns. By repeating the above steps, a three-dimensional shape model that actually exists is manufactured.

This will be described in more detail.

FIG. 1 shows a model 1 created by three-dimensional CAD.
FIG. 6 is a perspective view showing a final product shape of a molded article as described above.

The model 1 created by this three-dimensional CAD is divided and edited around the parting line 2 of the mold, and CAD data of the shape model 3 in which the shape of the model 1 is inverted is created.

FIG. 2 is a perspective view showing the shape model 3 inverted on the CAD.

Next, the CAD data of the model 3 is sliced, the photo-curing resin is cured by laser light by the stereolithography method, then moved in the unit of 100 μm downward, and then similarly cured and laminated. Create a three-dimensional shape.
The shape model 4 thus obtained is shown in FIG.

In the optical manufacturing method, since the three-dimensional CAD data can be faithfully copied as a three-dimensional shape model, the shape model 4 has the same shape as the shape model 3.

In FIGS. 4 and 5, the shape model 4 described above is used.
Is used as a female type, and a container 6 having a double structure for cooling the periphery of the shape model 4 with liquid nitrogen etc. 5 is attached, and graphite 7 melted with respect to the shape model 4 is attached.
Is injected and the shape model 4 is used as if it were a cavity mold of the mold, whereby the discharge master 8 shown in FIG. 6 is manufactured.

The shape of the discharge master 8 is exactly the same as the model 1 of the CAD data shown in FIG. Then, the discharge master 8 manufactures a mold.

According to these steps, it is possible to omit the conventional steps of designing the discharge master, examining the combination of the discharge master and the NC data, and creating the NC data.

Although this example has been described focusing on the stereolithography method using a photo-curing resin, the "SOLIDER method" developed by Cubital of Israel and the "Laminated Object Man" developed by Helissys et al.
In the case of manufacturing a model in which the product is inverted by the "ufacturing method", the fused master or the like can be injected in exactly the same manner to manufacture the discharge master.

Further, the case where the surroundings of the shape model 4 are cooled with a refrigerant such as liquid nitrogen has been described. A refrigerating machine is used for this, the refrigerating machine main body is installed in another place, and the refrigerator is cooled with a refrigerant. The same effect can be obtained by arranging instead of.

[0020]

According to the present invention, three-dimensional CAD of a molded product
A reverse shape is created from the data by a stereolithography method to form a female shape, and graphite or the like is injected into the shape to manufacture a discharge master, thereby designing the discharge master, examining a combination of the discharge master and NC data, NC. Processes such as data creation can be eliminated and die manufacturing time can be greatly reduced.

[Brief description of drawings]

FIG. 1 is a perspective view of a manufacturing model according to an embodiment.

FIG. 2 is a perspective view showing a shape model obtained by reversing the production model in FIG. 1 on CAD.

FIG. 3 is a perspective view showing an actual shape model manufactured by a stereolithography method based on the shape model on the CAD shown in FIG.

FIG. 4 is an explanatory view showing a usage state when the actual shape model shown in FIG. 3 is used as a female mold, FIG. 4 (A) shows a front view, and FIG. 4 (B) shows a top view; FIG. 4C shows a right side view of FIG. 4B with a part thereof cut away.

5 is a perspective view showing a usage state in FIG. 4. FIG.

FIG. 6 is a perspective view showing an actual discharge master taken out from the female die shown in FIG.

[Explanation of symbols]

 1 3D CAD model 2 Parting line at the time of mold making 3 Inversion model of model 1 Shape model manufactured by stereolithography 5 Refrigerant such as liquid nitrogen 7 Molten graphite 8 Discharge master

Claims (3)

[Claims] 1. A first step of forming a final product shape of a molded product by three-dimensional CAD, and an inversion operation based on shape data concerning the final product shape to form a mold corresponding to the final product shape. A second step of creating CAD data of a corresponding shape model, and a third step of forming an existing shape model based on the CAD data of this shape model,
A fourth step of manufacturing a discharge master by using the existing shape model formed in the third step as a female mold and injecting a molten conductor into the inside while cooling the periphery to solidify And a fifth step of forming a mold by using a discharge master. 2. In the third step, the CAD data of the shape model is sliced, the photo-curing resin is cured with laser light by a stereolithography method, and thereafter the same operation is repeated while moving downward by 100 microns. 2. The method of manufacturing a mold according to claim 1, wherein the existing three-dimensional shape model is manufactured by sequentially laminating the three-dimensional shape model. 3. In the second step, the final product shape is obtained by dividing and editing the parting line of the mold corresponding to the final product shape as a center based on the shape data of the final product shape. 2. The mold manufacturing method according to claim 1, wherein CAD data of a shape model corresponding to the mold corresponding to is created.