JPH05111727A - Manufacture of die - Google Patents

Abstract

PURPOSE:To reduce the manufacturing cost of the die. CONSTITUTION:An electrode assembling body 22 is composed by attaching an electrode 14 among plural electric discharge machining electrodes 14 manufactured from an electric conductivity metallic formed body with the thermal spraying method freely attachable and detachable to a reinforcing body 15 being in the recessed and projection fitting relation with each electrode 14, next, the die sinking is executed on a die stock 26 with the electric discharge machining by using the electrode assembling body 22, and the electrode 14 being worn away in this die sinking process is changed step by step to the new electrode 14. In such a way, if the reinforcing body 15 is commonly used and the electrode 14 is only changed, the economic efficiency can be improved in comparison with the case to abolish the worn electrode and the reinforce backing material together.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a die used for press working, casting and the like.

[0002]

2. Description of the Related Art Conventionally, a method of applying electric discharge machining has been known as a method of manufacturing a mold. In this case, as the electric discharge machining electrode, an electrode made of a conductive metal molded body by thermal spray molding is used, and the back side of the electrode is lined with a synthetic resin or the like to reinforce the electrode. ..

[0003]

In the die-sinking by electric discharge machining, the consumption of electrodes is extremely high, and therefore a plurality of electrodes must be prepared in order to manufacture one die.

However, if the lining process is performed for each electrode as in the prior art, a lot of man-hours are required for the lining process, and the lining material must be discarded together with the consumed electrodes, which is not preferable. There is a problem such as the economy.

In view of the above, the present invention makes it possible to removably attach each electrode to a common reinforcing body and surely reinforce each electrode, thereby improving the economical efficiency and manufacturing cost of a mold. It is an object of the present invention to provide a method for manufacturing the above-mentioned mold, which is capable of reducing the number of defects and performing engraving with high accuracy.

[0006]

According to the method of manufacturing a mold according to the present invention, one of a plurality of electrodes for electric discharge machining manufactured from a conductive metal molding by thermal spray molding is fitted with each electrode in a concavo-convex shape. The electrode assembly is detachably attached to the reinforcing body in a mating relationship, and then the electrode material is used to perform die-sinking by electric discharge machining on the die material. It is characterized in that it is replaced with a new electrode.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a pressing die 2 having a cavity 1 that opens upward, and the die 2 was manufactured by subjecting an aluminum alloy die material to die-sinking by electric discharge machining. It is a thing.

First, the production of an electric discharge machining electrode assembly used for die engraving will be described.

In FIG. 2, the model 3 is made of a heat-resistant material in which a binder is mixed in sand, a ceramic material or the like, and has a cavity 4 which opens upward and corresponds to the cavity 1 of the mold 2. Reference numeral 5 is a reinforcing box for housing the model 3.

In manufacturing the model 3, a method of machining a block made of a heat-resistant material or molding it using a heat-resistant material is adopted.

As shown in FIG. 3, a molten copper alloy of about 800 ° C. is sprayed to a predetermined thickness on the bottom surface and the inner peripheral surface of the cavity 3 of the model 3 using a spraying machine 6, and this spray molding is used to form a conductive metal. Get body 7. The metal molded body 7 has a tubular portion 8,
The bottom wall portion 9 is closed at one end thereof.

As shown in FIG. 4, the metal molded body 7 is released from the model 3, a plurality of bolt insertion holes 10 are formed near the opening edge of the cylindrical portion 8 along the opening edge, and the bottom is formed. Formed in the wall portion 9 is a machining liquid jetting hole 11 located at the center thereof and a plurality of sludge discharge holes 12 located around the jetting hole 11. Further, a lead wire 13 is connected to the tubular portion 10 for electrical discharge machining. Electrode 1
Get 4.

The above steps are repeated to manufacture a plurality of electrodes 14.

In FIG. 5, the reinforcing member 15 is the first electrode 1
4, and the electrode 14 is attached to the reinforcing member 15 from below the reinforcing member 15. Bolts 16 are inserted into the respective bolt insertion holes 10 and screwed to the reinforcing body 15, whereby the electrode 14 is detachably attached to the reinforcing body 15.

When the electrode 14 is fitted into the reinforcing member 15 in a concavo-convex manner in this manner, the reinforcing member 15 can surely reinforce the electrode 14. Further, when the electrode 14 is consumed, the reinforcing body 15 is commonly used so that the consumed electrode 1
It is economical because the 4 and the new electrode 14 may be exchanged.

The reinforcing body 15 has a working fluid reservoir 17 in the center thereof, and a supply passage 18 extending downward from the reservoir 17.
Communicates with the ejection hole 11 of the electrode 14. Further, the reinforcing body 15 has a sludge annular collecting passage 19 surrounding the pool 17, and a plurality of discharge passages 20 gathering in the collecting passage 19 communicate with the plurality of discharge holes 12 of the electrode 14, respectively. A cooling water passage 21 is formed in the reinforcing body 15.

In this way, the electrode assembly 22 composed of the electrode 14 and the reinforcing body 15 is constructed.

In this electrode assembly 22, the sump 17
Since the weight of the working liquid therein does not directly act on the electrode 14, the deformation of the electrode 14 can be prevented and the durability can be improved.

The reinforcing body 15 is the lifting block 2 of the electric discharge machine.
3, the supply path 24 formed in the elevating block 23 and communicating with the machining liquid supply source is opened in the pool 17 of the reinforcing body 15, and the elevating block 23 is formed in the collecting path 19 of the reinforcing body 15. Discharge path 2 communicating with the sludge discharge source
5 opens.

Next, the manufacture of the mold 2 will be described.

As shown in FIG. 5, in the working fluid, the electrode 14 of the electrode assembly 22 and the mold material 26 are opposed to each other with a predetermined clearance c therebetween, and then,
A discharge phenomenon is generated between the electrode 14 and the die material 26 to perform die engraving, and as the die material 26 melts, the electrode assembly 2
2 is lowered together with the lifting block 23.

As shown in FIG. 6, a cavity 27 having a shape following the shape of the electrode 14 is formed in the die material 26 as the electric discharge machining progresses.

On the other hand, the progress of this electric discharge machining causes wear of the electrode 14, and the thickness of the electrode 14 is reduced so that the electrode 14 has a shape different from the shape at the time of manufacture. Such a consumable electrode 1
Even if the electric discharge machining is continued using No. 4, the cavity 1 having a regular shape cannot be formed.

Therefore, the electric discharge machining is temporarily interrupted, the consumed electrode 14 is replaced with a new electrode 14, and the electric discharge machining is continued. As a result, as shown in FIG. 7, the cavity 1 having a regular shape is provided. Obtain the mold 2.

During electric discharge machining, a machining fluid is ejected from the ejection holes 11 to form a machining fluid flow between the electrode 14 and the die material 26, whereby sludge generated by melting the die material 26 is generated by the electrode. It is rinsed from between 14 and the mold material 26 and sucked and removed through each discharge hole 12.

In the engraving step, the consumed electrode 14 and the new electrode 14 are exchanged as many times as necessary.

[0027]

According to the present invention, since the reinforcing member is commonly used and only the electrodes are exchanged, the economical efficiency in manufacturing the mold is improved and the manufacturing cost of the mold is reduced. You can

Further, since the electrodes are fitted to the reinforcing member in a concavo-convex manner, the electrodes are surely reinforced and the electrode shape is maintained correctly.
As a result, die engraving can be performed accurately.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a mold.

FIG. 2 is a vertical sectional view of an electrode model.

FIG. 3 is a vertical cross-sectional view showing a state in which thermal spray molding is performed using an electrode model.

FIG. 4 is a vertical sectional view of an electrode.

FIG. 5 is a vertical cross-sectional view of an electrode assembly.

FIG. 6 is a vertical cross-sectional view showing an intermediate stage of die manufacturing by electric discharge machining.

FIG. 7 is a vertical cross-sectional view showing the final stage of die manufacturing by electric discharge machining.

[Explanation of symbols]

 2 Mold 7 Metal forming body 14 Electrode 15 Reinforcing body 22 Electrode assembly 26 Mold material

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Riya Saito 1-10-1 Shin-Sayama, Sayama City, Saitama Prefecture Honda Engineering Co., Ltd.

Claims (1)

[Claims] 1. A conductive metal molding (7) formed by thermal spray molding.
1 of the plurality of electric discharge machining electrodes (14) manufactured by
One electrode (14) is detachably attached to a reinforcing body (15) having a concave-convex fitting relationship with each electrode (14) to form an electrode assembly (22), and then the electrode assembly (22) is attached. Using it, the die material (26) is engraved by electrical discharge machining,
A method of manufacturing a mold, wherein the consumed electrode (14) is sequentially replaced with a new electrode (14) in this engraving process.