JPS58202727A - Electrode wire for wire-cut electro-discharge machining - Google Patents

Abstract

PURPOSE:To improve a state of finishing surfaces on a workpiece as an electrode wire having improvements in the speed of electro-discharge machining as well as being less in a sticking quantity to the workpiece, by forming those of Zn, Al, Zr and Cu into an alloyed wire at a specific ratio of these elements. CONSTITUTION:Cu is fused in a graphite crucible, then the melten metal surface is added with Zr by a mother alloy in a state of being covered with charcoal and fully fused by rising temperature higher. Afterward, the molten metal is calmed and Al is added, obtaining an ingot composed of Zn 10.0-40.0wt%, Al 0.3- 3.0wt%, Zr 0.3-2.0wt% and the rest of Cu. With this, the electrode wire is excellent in the speed of electro-discharge machining as compared with any other conventional electrode wire as well as a sticking quantity to a workpiece is well reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in electrodes for wire-cut electrical discharge machining.
In particular, it is an object of the present invention to provide an electrode edge for wire-cut electric discharge machining that causes less interference on the electric discharge machining speed wave (lt2 of work volume) and on the workpiece (workpiece).

In general, wire-cut electric discharge machining involves causing a discharge phenomenon 2+1-ν between a linear electrode and a workpiece, and cutting the workpiece t-1@ by melting due to the heat generated by the discharge.411
It is suitable for continuous machining of workpieces such as press molds that have a conical shape.

Therefore, in order to perform electric discharge machining using wire force, it is required that the finished surface condition and dimensional stability of the workpiece be good, and that the electric discharge machining time be short. In this case, the 1III-shaped electrode is a very large factor.

Considering the cost and running cost of the electric discharge machine, there is a strong demand for the same machining speed per unit time.

Conventional wire-cut electrical discharge machining electrode wire is hard copper-1.
65/35*Copper-1T/Gesten Green and the like have been used, but all of them have advantages and disadvantages and cannot provide the same level of performance.

The present invention is based on this current state of affairs, and after conducting extensive research, we have discovered an electrode wire that can increase the speed of electrical discharge machining and that can be applied to workpieces with (I) less adhesion.

That is, Zn 10.0-40. Owt*, A/! ,
0.3-3. Owt★, Zr O, 3~2. Owt-
It is characterized by being formed with an alloy rim made of 19g Cu.

The reason why Zn is limited to 10 to 40 wt% in the present invention is that below 10 wt%, the discharge D loe % is small.
This is because if it exceeds 40 wt-, it becomes difficult to process 9, which contains a large amount of β phase. Also, At is 0.3 to 3. The reason why Ovt is limited is because if it is less than 0.3 wt★, the machining speed is slow and the amount of adhesion to the workpiece does not decrease.
．． fJ wt'), castability and wire drawability will be adversely affected by 1, so C is reduced. Also, the reason why Zr is limited to 0.3-2, Ovt is because the machining speed is ν for 0.3wt-wood, and the attachment to the workpiece is also omitted, so 3J, 2w
This is because when the temperature exceeds t-, the Loe fastness cannot be maintained properly, and the castability and edge workability become unbalanced.

The alloy used in the present invention may contain 0.2 wt* or less of ordinary unavoidable impurities and -C.

An example of the present invention will be explained below.

Example: Dissolve graphite in a di-CUτ bath, cover the surface with charcoal, add Zr in a 5-coat pot, lower the temperature, and completely remove the bath layer. ll"0;/j After the hot water has subsided and Att.
I got it.

Next, this block was shaved with J15m (l) per tooth, heated to 800°C, and forced into a hot horn roll (tsuba roll) to make a block with a diameter of 8m, followed by stretching and 2A blunt T- A wire-shaped electrode mtM of the present invention having a diameter of 0.2 mm was repeatedly prepared.

Paste the 7'C electrode - on the electric discharge machine VC take 1, 1 release 4 / JLI machining speed k is the adhesion state to the workpiece t - sub-added ◎ - and the V result is the circumference υ shown in the 1st tIc Demeru.

The machining speed (work amount) is determined from the ratio of the die to be machined (4') and the machining time (minutes). This is the value when '1llJO' is assumed. Therefore, the larger this value is, the faster the processing speed will be.

The amount of adhesion to the workpiece was compared with the amount of adhesion t100 of a workpiece machined with a hard copper electrode by performing a measurement using an X-ray analyzer eC. Therefore, the smaller the value, the smaller the amount of adhesion of the proboscis.

“１′・１゜； Mai 1 1 thing (j ~ 1 啄ψ 4 16th ↓ 9 As is clear, the main brother Akira’ - the extreme connection is the mail delivery + j
Compared to the 7i wire and the comparative example electrode wire, the machining speed is faster and the amount of attachment to the workpiece is reduced.

The machining speed of the electrodes of shaft 1 comb 10~m24 is wide.
However, the amount of layered workpiece f+'\ is also significantly reduced. Furthermore, the comparison electrodes with circles 27 to 30 are 1 .mu.j higher than the Loe speed or less than the conventional electrode 41v, and there is hardly any improvement in layering. In addition, the wires of 1b3L to A134 had many disconnections that were considered poor in wire drawability as well as buildability, and it was not possible to move around the diameter of O1 to 03cm.

As described in detail above, the electrode edge for wide-cutting of the present invention improves the finish of the workpiece, improves the surface shape and dimensions, and improves productivity. It has an effect.

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Claims (1)

[Claims] Zn 10. O~40. Owt-1AtO, 3~3
．． U wt%, Zr O, 3-2. Owt”lk,
An electrode wire for wire-cut electrical discharge machining that is made of an alloy consisting of Cu in the IA part.