JPH02268929A - Manufacture of die - Google Patents

Abstract

PURPOSE:To bring the profile of cavity of an upper die and lower die to correspond accurately by cutting and dividing a block for forming die into small blocks and assembling after a cavity part is formed on each small block by working with a wire cutter. CONSTITUTION:A cubic block 1 for forming die is allotted to each partial dimension l1, l2, l3, l4 of a forming article X and is cut and divided into A, B, C, D and is fixed integrally by penetrating bolts Y and is divided horizontally and also a through hole 2 is bored. The small blocks A-D are divided by removing the bolts Y and C1 and C2 are combined and fixed and a wire cutter is inserted in the through hole 2 and the cavity part 3 corresponding to the partial shape of the forming article X which is allotted to the small block C is formed. When each of the small blocks is worked similarly and is assembled with the bolts Y, the upper die and the lower die are completed and the profile of the cavity is brought to correspond accurately.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a method for manufacturing a mold consisting of an upper mold and a lower mold, the mold for manufacturing a wax model used in the lost wax method. Relating to a manufacturing method.

(Prior Art) Conventionally, this type of mold is composed of an upper mold having a cavity corresponding to the shape of the upper part of the molded product, and a lower mold having a cavity corresponding to the lower part of the molded product, and has an integrated electrode. It is known that the mold is manufactured by forming a cavity by electric discharge machining such as machining method 1.

But 1. Electric discharge machining such as the integrated electrode machining method for molding the cavity of the mold requires an electrode dedicated to the upper mold and an electrode dedicated to the lower mold, and the upper mold and the lower mold are processed separately with their respective electrodes. Therefore, when the upper mold and the lower mold are overlapped, the outline of the cavity may be misaligned. Moreover, since the electrode wears out as the number of times the electrode is processed increases, variations in depth etc. may occur in the cavity processed by the electrode.

From the above, this mold has the disadvantage that the shape of the cavity cannot be stably and highly accurate.

(Problems to be Solved by the Invention) An object of the present invention is to solve the above-mentioned disadvantages and provide a mold manufacturing method that can stably obtain a highly accurate cavity.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides an upper mold having a cavity corresponding to the shape of the upper part of the molded article, and a lower mold having a cavity corresponding to the shape of the lower part of the molded article. In a method for manufacturing a mold in which the entire cavity of a molded product is divided into two parts, a mold forming block is cut vertically into a plurality of small blocks, and a plurality of divided blocks are divided. The small blocks are fixed together in the state before division, and each small block is cut horizontally using a wire cutting method to divide it into the upper mold component part and the lower mold component part. A step of horizontally opening a through hole through which a wire cutter is inserted in a divided surface formed by dividing the component part and a component part of the lower mold, and a step of opening a through hole in the through hole of each of the divided small blocks with a wire cutter. The method is characterized in that it consists of a step of inserting the mold into each small block to form a cavity portion corresponding to the shape of each part of the molded product.

In addition, there is a process of cutting each of the plurality of molding blocks in the vertical direction at a common position of each molding block to divide them into a plurality of small blocks, and a step of dividing each molding block into multiple small blocks. fixed together in the previous state, and cutting the small block group in the horizontal direction using a wire cutting method to divide it into a component part of the upper mold and a component part of the lower mold,
a step of horizontally opening a through hole through which a wire cutter is inserted in the dividing surface between the upper mold component and the lower mold component;
A small block for forming a cavity part for molding a common partial shape of a molded product is selected from each mold forming block, and a plurality of selected small blocks are inserted into through holes formed in them. A process of aligning and fixing the small blocks together, and inserting a wire cutter into the through holes of the aligned small blocks to cut the cavity portion corresponding to the common shape of the molded product into each small block at once. It is characterized by consisting of a step of molding into.

(Function) By the means described above, the present invention first cuts a block for molding in the vertical direction to divide it into a plurality of small blocks. At this time, each small block is divided according to dimensions for molding a cavity portion corresponding to the shape of each part of the molded product.

After that, each small block is fixed together in the state before division,
Using a wire cutter, each small block is horizontally cut into an upper mold component having a cavity corresponding to the shape of the upper part of the molded product, and a lower mold component having a cavity portion corresponding to the lower shape of the molded product. It is cut and divided, and a through hole is opened horizontally in the cut surface, so that a wire cutter used in the wire cutting method can be inserted therethrough.

Next, a wire cutter is inserted into the through hole to form a cavity portion corresponding to the shape of each part of the molded product in each small block. At this time, since the mold forming block is divided into small blocks, a cavity portion corresponding to the partial shape obtained by subdividing the shape of the molded product is individually molded into each of the small blocks.

This prevents the contours of the cavities between the upper mold and the lower mold from shifting.

In addition, when manufacturing multiple molds, first cut the multiple mold molding blocks at a common position in the vertical direction to divide them into multiple small blocks, and then return each block to the state before division. The small blocks are fixed together and cut horizontally into the upper mold component and the lower mold component by a wire cutting process for each mold forming block. At the same time, a through hole through which a wire cutter is inserted is horizontally opened in each small block in the divided surface.

Then, a small block for forming a cavity portion corresponding to a common partial shape of the molded product is selected from among the small blocks obtained by dividing the plurality of mold forming blocks. The thus collected small blocks for molding a cavity portion of the same shape are aligned and fixed together with their respective through holes aligned.

Thereafter, a wire cutter is inserted into the through holes of the aligned small blocks to form a common cavity portion for each small block. As a result, each small block is molded with a cavity portion corresponding to a common partial shape of the molded product at once. Then, each small block group is arranged again for each mold forming block to form a plurality of molds each having a cavity corresponding to a molded article.

(Example) Embodiments of the present invention will be described with reference to FIGS. 1 to 5.

The mold manufactured according to this example is for molding a molded article X having a shape as shown in FIG.

First, as shown in FIG. 1, a cubic mold forming block 1 is vertically cut into a plurality of small blocks A, B,
Divide into C and D. Each small block A, B, C, D is...
Cavities for molding each partial shape of the molded product X shown in FIG. 8 are manufactured. Therefore, the dimensions of each small block A, B, C, D divided after cutting are the dimensions L, f! of each part of the molded product X! + Assign to lx and Ils respectively and disconnect. And each small block A, B
.

Pass bolt Y through C and D to each small block A.

Fix B, 'C, and D together. In this case, when the small blocks A, B, C, and D are fixed together, the steps due to the deviation of the outer surfaces of the small blocks A, B, C, and D are formed between the small blocks A, B, C, and D. If the small blocks A, B, C, and D are formed together, it is preferable to grind their outer surfaces flat to remove the stepped portions while the small blocks A, B, C, and D are fixed together.

Next, as shown in FIG. 2, all small blocks A.

While B, C, and D are kept aligned, they are horizontally divided using a wire cutter (not shown), and at the same time, through holes 2 are drilled through all of the small blocks A, B, C, and D. The through hole 2 is formed at a predetermined position during the horizontal cutting process using a wire cutter (not shown), and has a diameter that allows the wire cutter to be inserted therethrough. At this time, it is preferable to polish the cut surfaces cut in the horizontal direction with a wire cutter to form a flat surface so that the cut surfaces can easily come into close contact with each other.

Then, each small block A and B are fixed together with bolt Y.
, C, and D are separated by removing the bolt Y, and the upper and lower parts are fixed together using fixing means (not shown). Next, a wire cutter is inserted into the through hole 2 of each small block. And each small block A.

The cavity portions of B, C, and D are individually processed using a wire cutting method. For example, as shown in FIG. 3, a small block C has a cavity portion 3 corresponding to the shape of a part of the molded product
to form. As a result, as shown in FIG. 4, the cavity portion 3 is molded with the contours of the divided portions 4 of the cavity portion 3 accurately matching.

Although not shown, the same operation is performed for each small block A, B, and D.

A cavity portion corresponding to the shape of each part of the molded product X assigned to D is molded.

In this way, the small blocks A, B, C, and D formed with cavities corresponding to the shapes of each part of the molded product X are aligned again, and as shown in FIG. 5, the constituent parts At, B+,
C+, D, and their corresponding constituent parts Az of each lower mold
, Bt 2 , Ct 2 , and DI are aligned to form an upper mold and a lower mold, and a mold 6 having a cavity 5 corresponding to the shape of the molded product X is manufactured. In this way, the cavity parts with a simple shape are molded individually using the wire cutting method, and the cavity parts are combined again to form a cavity corresponding to the shape of the molded product X. Therefore, the cavity can be molded into a complex shape. It can be formed into.

Next, another embodiment of the present invention will be described with reference to FIGS. 6 and 7.

When manufacturing a plurality of molds 6 from a plurality of mold-forming blocks 1, first, each mold-forming block 1 is subjected to the steps shown in the second figure, and each small through-hole 2 is formed. Mold blocks A, B, C, and D. As a result, each small block A, B, C.

D is the upper mold component parts A+, B+, C+, D+ and the lower mold component part A! , Bt , Ct , and Di to form a plurality of each.

Next, as shown in FIG. 6, a small block group (W) is formed by arranging a plurality of small blocks A, and the constituent parts A+, At, At, At of the upper mold and the constituent part A of the lower mold are formed.
! , Ax, At, and At are fixed together with bolts Y. Subsequently, the constituent parts At, A1, and A1 of the same-shaped upper mold are fixed together. At, At, and the constituent parts of the lower die of the same shape, At, Az, Az, and Ax are overlapped and pressed and held from above and below by fixing means (not shown). Then, a common shape corresponding to the shape of a part of the molded product Get 7.

The same operation is performed for the other small blocks B, C, and D, and a common shape corresponding to the shape of each part of the molded product X assigned to each small block B, C, and D is created for each small block. Block group (X).

(Y), (Z), each cavity part 8°9.1
Get 0.

Thereafter, as shown in FIGS. 7(W) to (Z), the plurality of small blocks A, B, C, and D, each having a cavity corresponding to the shape of each part of the molded product X, are aligned again, and each upper mold The constituent parts A+, B+, C+.

D, and the corresponding constituent parts Az of each lower mold.

A plurality of molds 6 are manufactured by aligning Bz, Cz, and Dz to form an upper mold and a lower mold. In this way, the plurality of molds 6 have cavity portions 7 of a common shape molded at -degrees,
By realigning 8.9.10, a cavity 5.6 of the same shape can be obtained.

Note that the ends of the bolts Y and nuts Z are provided so as to protrude from the surfaces 11 and 12 as shown in the first figure, but in order to allow grinding of the block surface, they should be placed there so that they do not protrude from the internuclear spaces 11 and 12. Needless to say, it is preferable to embed the block D in place of the nut Z. Furthermore, by forming a threaded portion in the block D instead of the nut Z, the mold can be configured even more easily.

(Effects of the Invention) As is clear from the above, in the mold manufactured by the present invention, the contours of the cavities of the upper mold and the lower mold accurately match.

Further, according to the present invention, the mold forming block is divided into small blocks and the cavity portion is individually molded in each of the small blocks, so that the cavity portion is molded in the partial shape of each small block, and the By realigning the small blocks of , molds with cavities of complex shapes can be manufactured.

Furthermore, the step of dividing into small blocks is carried out on multiple mold forming blocks, and the molding blocks are grouped together using only the common small blocks that mold the cavity part corresponding to the shape of a part of the molded object.
- Since the cavity portion is molded at the same time, multiple small blocks having a common cavity portion can be quickly produced;
By arranging these blocks for each mold forming block, a plurality of molds can be manufactured at the same time.

[Brief explanation of drawings]

Figure 1 is a perspective view showing the process of vertically cutting a mold block, Figure 2 is a perspective view showing the process of drilling a through hole in the mold block, and Figure 3 is a cavity of a small block. A perspective view showing the process of molding a part and the process of dividing it into upper and lower parts, FIG. 4 is an explanatory sectional view of the cavity part, FIG. 5 is a perspective view of the mold manufactured according to this example, and FIG. A perspective view showing a process of molding a cavity part in a block group and a process of dividing them into upper and lower parts, FIG. 7 is a perspective view showing a plurality of molds manufactured according to another embodiment of the present invention,
FIG. 8 is a perspective view showing the molded product. l...Mold forming block, 2...Through hole, 3.7
... Cavity part, 5... Cavity, A, B,
C, D...Small block, A,,B,,C,,D,...Component part of upper mold, tD. ... Component of the lower mold, X ... Molded object.

Claims (1)

[Claims] 1. All cavities of the molded product can be divided into an upper mold having a cavity corresponding to the shape of the upper part of the molded product and a lower mold having a cavity corresponding to the shape of the lower part of the molded product. In the manufacturing method of the constituent mold, the mold forming block is
The process involves cutting the blocks vertically and dividing them into multiple small blocks, fixing the multiple divided small blocks together in the state before division, and cutting each small block horizontally using a wire cutting method. , the upper mold component and the lower mold component are divided into the upper mold component and the lower mold component, and a through hole through which a wire cutter is inserted is horizontally formed in the dividing surface formed by dividing the upper mold component and the lower mold component. and a step of inserting a wire cutter into the through hole of each of the divided small blocks to form a cavity portion corresponding to the shape of each part of the molded product in each small block. Featured mold manufacturing method 2: All cavities of the molded product are divided into an upper mold having a cavity corresponding to the shape of the upper part of the molded product and a lower mold having a cavity corresponding to the shape of the lower part of the molded product. In a method for manufacturing a freely configured mold, the step of dividing each of a plurality of mold forming blocks into a plurality of small blocks by cutting each of the plurality of mold forming blocks in the vertical direction at a common position of each mold forming block; Each mold forming block is fixed integrally in the state before division, and the small block group is cut horizontally using a wire cutting method to divide it into a component part of the upper mold and a component part of the lower mold. At the same time, there is a process of horizontally opening a through hole through which a wire cutter is inserted in the dividing surface between the upper mold component and the lower mold component, and a common partial shape of the molded product from each mold forming block. A step of selecting small blocks for forming a cavity portion for molding, aligning the selected plurality of small block groups by matching the through holes formed in them, and fixing them together; inserting a wire cutter into the through-holes of the group of small blocks, and forming each small block at a time with a cavity portion corresponding to a common partial shape of the molded product. Production method