JPS6017041A - Electrode wire for wire-cut electric spark machining - Google Patents

Abstract

PURPOSE:To obtain an electrode wire for wire-cut electric spark machining having a high machining speed and capable of improving the dimensional accuracy and surface properties of a material to be machined by adding specified amounts of Zn and Y to Cu. CONSTITUTION:This electrode wire for wire-cut electric spark machining consists of 10-40wt% Zn, 0.05-2wt% Y and the balance Cu. In the composition, Zn is effective in increasing the machining speed and contributes to increasing the strength of the alloy wire. Y reduces the sticking of the electrode to a material to be machined in combination with Zn, and it increases the machining speed and provides easily linearity without reducing the strength. The electrode wire is easily manufactured at a low cost and shows superior work efficiency during automatic connection.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrode wire suitable for wire-cut electrical discharge machining.
The present invention relates to an alloy wire for a wire-cut electric discharge machining electrode wire containing 0.05 to 2.05 to 2.0 wt. 51) and the remainder being Cu.

The wire cut electrical discharge machining method involves generating electrical discharge between the workpiece and a linear machining electrode (hereinafter referred to as the electrode wire).1. This is a conventional method in which the electrode wire and the workpiece are moved relatively to cut the workpiece into a desired shape.

In this wire cut electric discharge machining method, a long wire with a diameter of 0.05 to 0.8 mm is usually prepared as a linear electrode wire, and new wires are sequentially supplied to the electric discharge machining part. ing.

In the electrical discharge machining method, the suitability of the electrode wire used has a direct and significant effect on machining speed, machining accuracy, surface quality of the workpiece surface, etc., so there is a strong demand for the use of suitable materials. ing.

In general, the requirements for this electrode wire are: (1) Machining speed: Since the wire cut electric discharge machining method generally does not necessarily have a fast machining speed, it is possible to increase the machining speed even a little.

(2) Dimensional accuracy and surface texture of the workpiece It must be possible to process the workpiece with good two-dimensional accuracy and without causing surface roughness.

(3) Workability: If the electrode wire breaks during cutting work, workability will be significantly impaired, so the occurrence of breakage during this work should be low. In addition, in recent years, automatic wire connection mechanisms have been added to processing equipment to improve workability and provide a C effect, but for this purpose, it is desired that the electrode wires be free of loose wires.

(4) Price: As mentioned above, the electrode wire is a consumable item, so it should not be expensive.

etc. are listed.

To further explain the above requirements for the electrode wire, the machining speed must be such that a sufficiently stable electrical discharge is generated between the electrode wire and the workpiece, and the electrode material does not adhere to the workpiece. Although it has been found that it is effective to prevent short circuits by using materials, there is no electrode wire that can achieve this effect using inexpensive materials, and the emergence of such a material has been eagerly awaited.

In addition, in order to obtain the dimensional accuracy of the workpiece, it is necessary to maintain the dimensional accuracy of the diameter of the electrode wire and to apply sufficient tension to the electrode wire. It requires something difficult.

Next, regarding surface properties such as rough skin, it is necessary to generate a uniform and stable discharge, and it is also desirable that there be no adhesion of electrode deposits.

In addition, wire breaks during cutting are caused by short circuits between the electrode wire and the workpiece, uneven electrical discharge, and applied tension.
From this point of view, the electrode wire itself is required to have dimensional accuracy, stable discharge performance, and high tensile strength.

Furthermore, it is necessary that the alloy raw materials be inexpensive so as not to be expensive, and that the wire drawability into fine wires of 0.05 to 0.3 Wmφ as electrodes for electrical discharge machining be good.

Conventionally, copper wire, brass wire (Cu-35 Zn), tungsten wire, etc. have been used as electrode wires for wire-cut electrical discharge machining, but these do not necessarily meet the above requirements in the following points. It wasn't.

That is, copper wire has drawbacks such as not having very high strength, being easily broken, and being inferior to general pζ brass wire in terms of processing speed.

In addition, although brass wire has improved processing speed over copper wire, it is still not sufficient as some adhesion occurs, and the dimensional accuracy and surface condition of the workpiece are not necessarily good, and in addition, workability is It also has the disadvantage that it cannot be said to be sufficient in terms of both.

Furthermore, tungsten wire is difficult to draw, is an expensive material, and has poor electrical discharge machinability.

This invention was discovered as a result of various studies in view of these problems, and provides an alloy wire suitable as an electrode wire for wire-cut electrical discharge machining.

That is, this invention has Zn1.0 to 4.0 weight ratio and Yo, 0
This is a wire-cut electric discharge machining electrode wire characterized in that it contains 5 to 2 parts by weight and the remainder is made of Cu.

In this invention, Zn is effective in increasing the processing speed as described above, and also contributes to increasing the strength of the alloy wire.

However, the reason why the Zn content is defined as 10 to 4.0 weight ratio is that if the Zn content is less than 10 weight ratio, the effect of "Yu" will be small, and if the content exceeds 4.0 weight ratio. However, it does not mean that the effects in the above range can be further improved,
This is because, on the contrary, it becomes extremely difficult to draw a thin wire, which is undesirable.

5- In addition, the use of Y, together with the presence of Zn, reduces the adhesion of the electrode to the workpiece, speeds up the processing speed, and improves the strength and linearity without causing a decrease in strength. It brings about improvement effects such as ease of use, and has a great effect on improving the speed of electrical discharge machining, improving dimensional accuracy, and improving workability.

The amount was defined as a range of 0.05 to 2 weight ratios.
This is because if the weight ratio is less than 0.05, the effect will be small, and if the content exceeds 2, it will only cause segregation of Y or impair workability, making it difficult to achieve the above-mentioned further improvement effect.

In addition, in the alloy wire of this invention, Sn,
There is no problem in containing one or more elements such as Ag, Mg, Si 1k13, and other elements that act as deoxidizing agents, as long as the total does not exceed 1 part.
On the contrary, there are cases where it is preferable because it exhibits effects such as increasing strength.

As detailed above, the alloy wire for wire-cut electric discharge machining electrode wire of the present invention has a high machining speed during electric discharge machining, has excellent dimensional accuracy and surface texture of the workpiece by -6, and is capable of producing thinner wires. It is easy to process, and has good workability with few wire breaks during processing, making it very useful as an electrode wire for processing various workpieces.

The present invention will be explained in detail below with reference to Examples.

Example 1 Normal electrical copper ingot and Zn, 'Sn are Y,
M is made by semi-continuously casting an alloy material having the composition shown in Table 1 using a master alloy, hot extruding it into a rough drawn wire of 8 WRφ, and then stripping it during the wire drawing process to make a 2.6 column φ wire. After performing intermediate heat treatment, an electrode wire with a diameter of 0.20 mm was manufactured.

In addition, due to the work tendency of automatic wire connection, a light electrical heating treatment was performed at the final stage of the wire drawing process.

As an additional note, the strength of Examples 1 to 4 of the present invention decreased little in this treatment, and electrode wires with excellent linearity without wire distortion were obtained while maintaining a tensile strength of 100 My/- or more. When trying to obtain sufficient linearity with other electrode wires, strength decreased or linearity became difficult to obtain.

Further, as a conventional example and a comparative example, electrode wires were made using the same method using alloy materials having the compositions shown in Table 1.

Problems with the wire drawing process for the obtained electrode wire are also listed in Table 1, and from the contents of Section 60-I and Table 1-1, the electrode wire of the composition of this invention can be processed up to fine wires. It has been recognized that it can be produced easily and industrially advantageously.

Example 2゜ Using the electrode wire of 0.20 mmφ obtained in Example 1, a thickness of 6
Wire-cut electric discharge machining was performed using 5KD-11 of 0.05 mm as a workpiece, and the results are shown in Table 2.

The processing speed is expressed as the ratio of the processing cross-sectional area per unit time (that is, the product of the processing feed rate and the thickness of the workpiece), with the brass wire (bay 6) being 1.00.

Table 9-10-L shows that using the electrode wire of the present invention, it is possible to perform processing with less adhesion of both materials, good acceleration and velocity, and excellent surface quality and dimensional accuracy. It was done.

It was also found that it is easy to manufacture and inexpensive, has fewer problems such as wire breakage during use, and has excellent workability in automatic wire connection.

As described in detail below, the electrode wire of the present invention contains 10% Zn.
~・Contains 1.0 weight ratio and Yo, 05~2 weight 1 ratio,
Since this wire-cut electric discharge machining electrode wire is characterized by having the remainder made of Cu, it is possible to perform wire-cut machining with excellent machining speed, machining accuracy, and machining surface quality. It is something that brings profit.

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Claims (1)

[Claims] A wire cut electrode wire for electric discharge machining, characterized in that it contains Zn1.0 to 4.0 weight factor and Yo, 05 to 2 weight factor, and the remainder is Cu.