JPS58197244A - Alloy wire for electrode wire for wire-cut electric spark machining - Google Patents

Abstract

PURPOSE:To obtain the titled alloy wire having a high electric spark machining speed, providing superior dimensional accuracy and surface properties to a material to be machined, and causing hardly breaking while working by adding specified amounts of Zn, Fe and P to Cu. CONSTITUTION:This alloy wire consists of, by weight, 5-38% Zn, 0.1-1.5% Fe, 0.02-0.5% P and the balance Cu. Zn is effective in increasing the machining speed and contributes to the improvement of the strength of the alloy wire. Fe enhances the strength and arc resistance of the alloy wire, and it is very effective in increasing the machining speed and enhancing the dimensional accuracy and work efficiency. P combined with Zn and Fe increase the machining speed and shows an effect of enhancing the dimensional accuracy and surface state of a material to be machined.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an alloy wire suitable as an electrode wire for wire cut electrical discharge machining.
The present invention relates to an alloy wire for a wire-cut electrical discharge machining electrode wire, which contains 0.1 to 1.5% by weight of Fe, 02 to 0.5% by weight of Po, and the remainder is essentially Cu.

The wire cut electrical discharge machining method generates electrical discharge between the workpiece and a linear machining electrode (hereinafter simply referred to as electrode wire), and moves the electrode wire and workpiece relatively. This is a conventional method in which the workpiece is cut into a desired shape.

In this wire cut electrical discharge machining method, the linear electrode wire usually has a diameter of 0.05 to 0.23 rdm'i.
' A long wire is prepared and used by sequentially supplying different wires to the electrical discharge machining part.

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 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 quality of the workpiece; processing with good 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.

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

etc. are listed.

The machining speed can be increased if a sufficiently stable electric discharge is generated between the electrode wire and the workpiece, but the conventional machining speed is Electrode wires that can speed up the process often cause roughening of 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 apply sufficient tension, and the electrode wire must be used in a taut state. It requires something difficult to do.

Next, regarding surface properties such as rough skin, it is necessary to generate a uniform and stable electrical discharge.
Since it has been difficult to satisfy both of the processed surface conditions, it is particularly desirable to develop an electrode wire that satisfies both of these points.

In addition, wire breaks during cutting are caused by short circuits between the electrode wire and the workpiece, uneven 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 material is inexpensive so as not to be expensive, and that it has good wire drawability into a fine wire with a trench of 0.05 to 0.25 mJ as an electrode for electrical discharge machining.

Conventionally, copper wire, brass wire (Cu-30%Zn), tungsten wire, etc. have been used as electrode wires for wire-cut electrical discharge machining, but these wires 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 generally inferior to brass wire in terms of processing speed.

Brass wire still has improved processing speed over copper wire, but it is still not sufficient, and it cannot be said that the dimensional accuracy and surface condition of the workpiece are necessarily good, and in addition, it is not always good in terms of workability. However, it has some drawbacks such as not being sufficient.

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

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

That is, this invention uses Zn 5 to 38 weight ratio and FeO, 1
~1.5M amount, containing ~0.5% by weight of PO002,
This is an alloy wire for wire-cut electrical discharge machining electrode wire, characterized in that the remainder is essentially Cu.

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

However, the reason why the Zn content is defined as 5 to 38% by weight is that if it is less than 5% by weight, the above effect will be small, and even if it is contained in an amount exceeding 38% by weight, the effect will not be achieved in the above range. This is not because it does not result in further improvement, but on the contrary, it becomes extremely difficult to draw a thin wire, which is not desirable.

Further, the use of Fe particularly improves the strength and arc resistance of the alloy wire, and has a great effect on improving the electrical discharge machining speed, improving dimensional accuracy, and improving workability.

The amount was defined as a range of 0.1 to 1.5 weight.
．． If it is less than 1% by weight, the effect is small, and even if it is contained in an amount exceeding 1.5%, FeO segregation may occur.
This is because it is difficult to achieve the above-mentioned further improvement effect only by impairing workability.

In addition, P is used to increase the machining speed in combination with the effects of Zn and Fe, and also to improve the dimensional accuracy and surface condition of the workpiece. It has the excellent effect of improving both the surface properties of the workpiece.

The reason for setting the amount of P in the range of 0.05 to 0.5% by weight is that if it is less than 0.05% by weight, the above effect will be small, and if it is contained in excess of 0.5% by weight, it will be a nuisance. This is because there is a risk that the conductivity may be lowered and the current flowing may be restricted or workability may be impaired, and the above effects are unlikely to be further improved.

Note that the alloy wire of this invention contains Snt as an impurity.
AgtMg, St, AI! There is no problem in containing one or more elements such as or other elements that act as deoxidizing agents, as long as the total does not exceed 1. On the contrary, it is preferable because it exhibits effects such as increasing strength. In some cases.

As detailed above, the alloy wire for wire-cut electrical discharge machining electrode wire of the present invention has a high machining speed during electrical discharge machining, has excellent dimensional accuracy and surface quality of the workpiece, and can also be processed into fine wires. It is very useful as an electrode wire for processing various workpieces because it is easy to work with and has good workability with few wire breaks during processing.

The invention will be explained in detail below using examples.

Example 1 Normal electrical copper ingot and Zn, “Sn is Fe,
PXMgXkl is made by semi-continuously casting an alloy material having the composition shown in Table 1 using a master alloy, hot rolling it into 8 gates 7 rough wire, and then removing the skin during the wire drawing process. .6
After performing an intermediate heat treatment at mF, a 0-20-2O electrode wire was manufactured.

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 except for the tungsten wire.

The manufacturing problems and price points of the obtained electrode wire are listed in Table 1.

Note that a commercially available tungsten wire was used.

From the above table, it was confirmed that the electrode wire having the composition of the present invention can be easily processed into fine wires and can be produced industrially at low cost.

Example 2 Using the electrode wire of 0.20 mmφ obtained in Example 1, 5KD-11 with a thickness of 5Qmm was machined under the following wire-cut electric discharge machining conditions, and the results were reported in the second example.
Shown in the table.

Wire cut electrical discharge machining conditions Machining voltage 110V Machining peak current 10A Capacitor value 1.0 μF Wire tension 750g Pure water specific resistance 4 X 10 It is expressed as a ratio of the area (ie, the product of the processing feed speed and the thickness of the workpiece).

The electrode consumption ratio is also expressed as a ratio, with the value of weight loss per unit processing speed of the copper wire (No. 7) taken as 1.

From the table above, it was confirmed that when the electrode wire of the present invention is used, processing can be performed at a good processing speed, with less wear and tear on the electrode wire, with good dimensional accuracy, and with excellent surface quality.

It was also recognized that it was easy to manufacture, inexpensive, had fewer troubles such as wire breakage during use, and had excellent workability.

As detailed above, the electrode wire of the present invention has a zn of 5 to 3.
8 weight attack and Fe O, 1~1.5 wt%, Po, 02~
This wire-cut electrical discharge machining electrode wire is characterized by containing 0.5% by weight and the remainder essentially consisting of Cu, which enables wire-cut machining with excellent machining speed, machining accuracy, and machined surface quality. It is a material that can be used industrially to bring great benefits.

Patent applicant: Sumitomo Electric Industries, Ltd. 1 Agent: Patent Attorney Kazu1) Akira

Claims (1)

[Claims] Zn5~38 weight ratio and FeO,1~], 5% by weight,
An alloy wire for a wire-cut electrical discharge machining electrode wire, characterized in that it contains 02 to 0.5% by weight of PO, and the remainder consists essentially of Cu.