JPS5894926A - Electrode wire for wire-cutting electric discharge machining - Google Patents

Abstract

PURPOSE:To facilitate the elongation of an electrode wire for wire-cutting electric discharge machining and heighten its speed, by composing the wire of 5- 30% by weight of Zn 4.2-10% by weight of Al and the rest of Cu and ordinary impurities. CONSTITUTION:Zn and Al are added to Cu to manufacture a wire electrode to heighten the speed of electric discharge machining. The Zn content is limited within the range of 5-30% by weight so that the elongation of the electrode wire in its manufacturing is easy and a high electric discharge machining speed is maintained although 4.2-10% by weight of Al is contained. If the Zn content exceeded 30% and the Al content exceeded 10%, the electric discharge machining speed would not drop but the elongating property of the wire in its manufacturing would deteriorate. Therefore, the electrode wire is composed of 5-30% of Zn, 4.2-10% of Al and the rest of Cu and ordinary impurities.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrode wire for wire-cut electrical discharge machining, and particularly to one that improves the electrical discharge machining speed.

In general, wire-cut electrical discharge machining involves creating an electrical discharge phenomenon between a wire-shaped electrode wire and the workpiece, and melting and cutting the workpiece with the heat generated by the discharge. Suitable for systematic machining of large workpieces.

Wire-cut electrical discharge machining requires that the finished surface condition and dimensional accuracy of the workpiece be good, and that the electrical discharge machining time be short. It is necessary to improve the efficiency of the discharge phenomenon that occurs at the threshold with the body.

However, once the type of electrical discharge machine and the workpiece are specified,
The finished surface condition, dimensional accuracy, and processing speed of the workpiece depend on the wire-shaped electrode wire used. Conventionally, as a wire-shaped electrode line.

Hard copper wire, 65/1g brass wire, tungsten wire, etc. are used depending on the purpose, but hard copper wire and 65/36 brass wire have poor processing speed, and tungsten wire has the disadvantage of high cost. .

In view of this, the present inventors have conducted various studies and found that Cut=
It was discovered that the electrical discharge machining speed of a wire-shaped electrode wire can be significantly improved by adding and coexisting Zn and A1, and Zn5 to 46 wt% (hereinafter simply referred to as wt%), Mu10.1 to 4 %, the balance Cm and ordinary impurities. In this electrode wire, the Zn content is 5 to 40% and the AI content is 0.
．． The reason for limiting the content to 1 to 4% is that if either the content of Al or Al is less than the lower limit, the effect of improving the electrical discharge machining speed will be small, and if the content exceeds the upper limit, wire drawing to produce electrical wire will be difficult. It was for a reason.

As a result of further research on this issue, the present invention found that by limiting the Zn content, wire drawing becomes easier even when the At content is increased, and moreover, an excellent electrical discharge machining speed is maintained. The wire-cut electric discharge machining electrode wire of the present invention has been developed, and contains Zn5-30% and At4.2-10%.
%, with the remainder Cu2 consisting of ordinary impurities.

That is, in the present invention, even if the 7m content is limited to 5 to 30% and the AI content is 4.2 to 10%, the wire drawing process is still possible in the production of electrode wires (diameter 0.1 to 0.3 cm). is easy and maintains excellent electrical discharge machining speed. However, 7m
If the Zn and Al content exceeds 30% and the At content exceeds 10%, the electrical discharge machining speed will not decrease, but the wire drawability in electrode wire production will be significantly reduced. Therefore, the Zn and AI contents are limited as described above. This is what I did.

In the present invention, it is desirable that the total amount of normal impurities contained in the C-contained metal be 0.2% or less.

Hereinafter, the present invention will be explained with reference to examples.

Cm was melted in a graphite crucible, the surface of the hot water was seeded with charcoal powder, and 2-ho and Gen were added, and after the hot water had settled, it was cast in a preheated mold to form the composition shown in Table 1. An ingot (medium 25 cm, thickness 25 cm, length 40 cm) was obtained.

Next C: The surface of the ingot is milled 2 times per side, then hot worked to make a wire with a diameter of m, which is then repeatedly subjected to wire drawing and annealing to create a wire cut with a diameter of Oj. An electrode wire for processing was manufactured.

The electrode wire thus produced was attached to an electrical discharge machine and the suitability of electrical discharge machining was examined. In addition, the quality of wire drawability was determined based on the number of wire breaks during the wire drawing process. II these results! Ill! Also listed.

In addition, the wire drawability is the one with the least number of processing interruptions 1
Items with many defects, defects, and disconnections were considered difficult. In addition, the machining speed control is installed on the electric discharge machine, and the machining speed calculated from the ratio of the amount of workpiece (*) and the machining time difference) is compared with the excessive machining of hard copper wire. This shows the value when . Therefore, the larger the value, the better the processing speed.

As is clear from Table 1, Table 1111, the electrode wires of the present invention (,41~
416) have good wire drawability and electrical discharge machinability of 1.
19-152 and conventional electrode wire (,419,420) 4:
It can be seen that it is far superior compared to 1-.

On the other hand, in both the comparison electrode wire λ17 with a high z11 content and the comparison electrode wire 18 with a high At content, the improvement in discharge acceleration is saturated, and not only can no further improvement be expected.
Wire drawability is mii.

As explained above, according to the present invention, wire drawability is easy, the electrical discharge machining speed (work amount) is far superior to 1:1, and the present invention has a remarkable effect of reducing running costs in electrical discharge machining. .

Claims (1)

[Claims] Wire-cut electrical discharge machining electrode consisting of ZflS~30W+%, A-j44~10wt%, balance Cu and normal impurities