JPS618227A - Electrode-wire for wire electric discharge - Google Patents

Abstract

PURPOSE:To improve the casting performance and extension performance as electrode wire and eliminate the adhesion of Cu onto a workpiece by adding Zn, Si, and Al into Cu and setting each addition amount of Si and Al at 1.2wt% or les, less than 0.2wt%. CONSTITUTION:One electrode wire is made of the material containing 30- 40wt% Zn, 0.1-1.2wt% Si, 0.01-0.2wt% Al, and the rest substantially consisting of Cu, and the other electrode wire is made of the material containing 30- 40wt% Zn, 0.1-1.2wt% Si, 0.01-0.2wt% Al, and one or two kinds among Ga, In, Sn, Mg, Zr, and Y in 0.05-0.5wt%, and the rest substantially consisting of Cu. In other words, the casting performance and extension performance as electrode wire can be improved markedly by adding Zn, Si, and Al into Cu, and setting each addition amount of Si and Al at 1.2wt% or less, less than 0.2wt%, and the electric discharge characteristic free from the adhesion of Cu onto a workpiece is provided. Further, by adding one or two kind among Ga, In, Sn, Mg, Zr, and Y in 0.05-0.5wt%, high-temperature strength can be improved, and the adhesion of Cu can be suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Technical Field The present invention relates to a method for manufacturing a composite wire suitable as an electrode wire for wire electrical discharge machining.

(b) Background of the technology The wire-cut electrical discharge machining method involves creating electrical discharge between the workpiece and a linear machining electrode (hereinafter referred to as electrode wire).
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 electric discharge machining method, a long wire having a diameter of usually 0.05 to 0.25 mm is prepared as a linear electrode wire, and new wires are sequentially supplied to the electric discharge machining area.

In the electric discharge machining method, the quality of the electrode wire used has a direct and significant effect on the machining speed, machining accuracy, and surface quality of the workpiece surface, 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 electrical discharge machining method generally does not necessarily have a fast machining speed, it must be possible to increase the machining speed even a little.

(2) Dimensional accuracy and surface texture of workpiece: Good dimensional accuracy,
It can also be processed 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. Furthermore, when setting the wire in a processing machine, and especially when using an automatic wire feeding device, it is strongly desired that the wire has no curls and has straightness.

(4) Price: As mentioned above, the electrode wire is a consumable item, so it should be inexpensive.

etc. are listed.

To further explain the above requirements for the electrode wire, the machining speed can be increased if a sufficiently stable electrical discharge is generated between the electrode wire and the workpiece, but conventionally the machining speed cannot be increased. Electrode wires that can be used often cause roughness on the surface of the workpiece.

In addition, in order to obtain 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 ensure that the electrode wire is stretched in a straight line. It requires something difficult to do.

Next, regarding surface properties such as surface roughness, it is necessary to generate a uniform and stable electric discharge, and conventional machining speed and dimensional accuracy,
Since it has been difficult to satisfy both of the processed surface conditions, it is particularly desired to develop an electrode wire that satisfies both of these points.

In addition, wire breaks during cutting work are caused by short circuits between the electrode wire and the workpiece, uneven discharge, and applied tension, so from these points of view, it is important to ensure the dimensional accuracy and stable discharge performance of the electrode wire itself. , high tensile strength is required.

Furthermore, it is necessary that the raw materials are inexpensive so as not to be expensive, and that they have good wire drawability into thin wires with a diameter of 0.05 to 0.25 mm as electrodes for electrical discharge machining.

Conventionally, copper wire, brass wire (
Cu-3096Zn), tungsten wire, etc. have been used, but none of these fully satisfies the above-mentioned required characteristics in the following respects.

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

In addition, although brass wire has improved processing speed over copper wire, it is still not sufficient, and the dimensional accuracy and surface condition of the workpiece are not necessarily good, and in addition, workability is not necessarily sufficient. It has the disadvantage of being unable to speak.

Furthermore, tungsten wire is difficult to draw, is an expensive material, and does not have very good electrical discharge machinability.

From this point of view, many copper alloy wires have been proposed, particularly as electrode wires with less copper adhesion.

That is, JP-A No. 59-50141 is 20 to 50'; 4
6 Zn-Ni.

The total of one or two of Co and Si is 0.5 to 2
96, an electrode wire consisting of the remainder Cu, and JP-A-57-4
No. 1184 is 5-40962n, 0.1-4%A
A', an electrode wire made of Cu as the remainder is disclosed.

All of these have the effect of preventing Cu adhesion, but the latter electrode wire cannot prevent adhesion due to special conditions in which, for example, high-precision machining is performed by increasing the resistivity of water, which is a machining fluid. On the other hand, in the former electrode wire, when Si is 1.5% or more, adhesion disappears under most conditions, but castability and drawability are poor.

(c) Purpose of the invention The present invention has good castability and wire drawability, and also provides C to the workpiece.
It is an object of the present invention to provide an electrode wire with almost no adhesion.

B) Disclosure of the Invention In order to achieve the above object, the present invention has developed an electrode wire that has good casting and wire drawability and almost no Cu content attached to the workpiece, as a result of various research studies. One of the inventions is Zn 30-40 weight paper S i O, 1-1.2
The electrode wire contains 0.1 wt.% or more and less than 0.2 wt.% of Alo, with the balance essentially consisting of Cu, and the other one contains 30-40 wt.% of Zn and 1-1.2 wt.% of SiO. weight%
, AlO, 01% by weight or more and less than 0.2% by weight, and Ga.

The electrode wire contains one or two of In, Sn, Mg, Zr, and Y in a total amount of 0.0.5 to 0.5% by weight, and the balance essentially consists of Cu.

That is, in the present invention, by adding Zn HS t +AA' to Cu, and increasing the amounts of Si and A4 to 1.
Since the content is 2% by weight or less and less than 0.2% by weight, it has extremely good castability and drawability as an electrode wire, and has discharge characteristics with almost no Cu content attached to the workpiece. G
By adding 0.05 to 0.5% by weight of one or two of a, In, Sn, Mg, Zr, and Y, high temperature strength is improved and the adhesion of Cu components is further suppressed.

Next, the reason for limiting the amount of each element added in the present invention will be described. The reason for setting the Zn content to 30 to 40% by weight is that if the Zn content is less than 30% by weight, it is not possible to improve the processing speed;
This is because wire drawability deteriorates if it exceeds this range. The amount of Si is 0.
The reason for setting the Si content to 1 to 1.2% by weight is that if the Si content is less than 0.1, no improvement in processing speed can be expected, and if it exceeds 1.2% by weight, the castability and wire drawability will be poor. AI amount 0.01% or more
．． The reason why the amount of M is less than 2% by weight is that if the amount of M is less than 0.01% by weight, there is no effect on the wire drawability (and if it is more than 0.2% by weight, the drawability becomes poor).

A total of 0.05 to 0.5% by weight of one or two of Ga, In, Sn, Mg, Zr, and Y is less than 0.05% by weight to improve high-temperature strength and prevent Cu from adhering. is not effective, and even if it exceeds 0.5% by weight, no improvement in the above characteristics can be obtained.

Next, the present invention will be explained using examples.

(E) Example: An alloy having the composition shown in Table 1 was cast and wire-drawn using a conventional method.
The electrode wire had a diameter of 50±0.001 mm. As an evaluation method, machining voltage: 110V, machining peak current: 10A, capacitor capacity: 1.0μF, wire tension: 860g, pure water specific resistance: 4X10'18X10', 2X10'Ω・
The test was carried out under the conditions of 40t 5KD-10 of the stamped workpiece, and the evaluation is shown in Table 2.

(F) Effects of the Invention As detailed above, the electrode wire of the present invention has good castability and drawability, and has the property of almost no Cu content adhering to the workpiece, making a great contribution to the electrical discharge machining industry. It is thought that then.

Table 1 Table 2 Procedural Amendment Written September 1980 Date Patent Application No. 128978 2 Title of Invention Electrode Wire for Wire Electrical Discharge Machining 3 Relationship with the Amendment Case Address of Patent Applicant Osaka 5-15 Kitahama, Higashi-ku, City Name (21
3) President of Sumitomo Electric Industries, Ltd. Tetsube 4, Agent address: Sumitomo Electric Industries, Ltd., 1-1-3 Shimaya, Konohana-ku, Osaka (6) Detailed explanation of the invention in the specification subject to amendment Column (7) Contents of the amendment (1) Page 1 of the specification, lines 16 to 17 “...
Remove "Suitable composite wire manufacturing method".

(2) Delete “Cut” on page 1, line 19 of the statement.

(3) Table 1 on page 9 of the specification will be corrected as shown in the attached sheet.

Table 1

Claims (2)

[Claims] (1) A wire discharge characterized by containing 30 to 40% by weight of Zn, 0.1 to 1.2% by weight of Si, 0.01% to less than 0.2% by weight of Al, and the balance essentially consisting of Cu. Electrode wire for processing. (2) 30-40% by weight of Zn, 0.1-1.2% by weight of Si, 0.01% by weight or more of Al but less than 0.2% by weight, and Ga
, In, Sn, Mg, Zr, and Y in a total of 0.05 to 0.5% by weight, and the remainder is essentially Cu.
An electrode wire for wire electrical discharge machining characterized by: