Electrode for electric discharge machining

A technology for electrical discharge machining and electrodes, applied in the field of electrodes for electrical discharge machining, can solve problems such as a surge in electrode consumption, and achieve the effects of good surface accuracy, shortened machining time, reduced number of introductions and maintenance.

Active Publication Date: 2013-03-27
NIPPON TUNGSTEN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] When using carbon or Cu electrodes for electrical discharge machining, although the machining speed can be easily increased by improving the discharge conditions, the consumption of the electrode itself increases sharply, and the shape of the electrode is reflected on the workpiece

Method used

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  • Electrode for electric discharge machining
  • Electrode for electric discharge machining
  • Electrode for electric discharge machining

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1）

[0106] As raw materials for forming the W skeleton, 79 parts by mass of W with an average particle diameter of 4 μm, 1 part by mass of Ni with an average particle diameter of 1 μm, and 0.4 parts by mass of Sr with an average particle diameter of 7 μm were prepared.

[0107] As Sr boron oxide, SrCO mixed with an average particle size of 5 μm was used in a mass ratio of 2:1. 3 and B 2 o 3 , obtained by firing at 1050° C. for 30 minutes in an air atmosphere.

[0108] These powders were mixed by a Henschel mixer for 30 minutes to obtain mixed powders.

[0109] Next, the mixed powder was mold-pressed at a pressure of 50 MPa to obtain a rod-shaped compact.

[0110] In the heat-resistant container, a portion of the concave portion that fully accommodates the molded body is provided, and the molded body is placed therein. 2 Sintering was carried out at 1150° C. for 60 minutes in an atmosphere to obtain a skeleton.

[0111] A sufficient amount of plate-like Cu is provided on the s...

Embodiment 2）

[0145] Next, use a sample that changes the mass ratio of M1 and M2, or use boron oxides of one or more of iron group metals, alloys of M2 and iron group metals, Mg, Ca, Sr, Ba, and rare earth metals, Samples obtained from different types were selected, and the same test as sample 1 was performed.

[0146] The composition of each sample is shown in Table 6 and Table 7, and the evaluation is shown in Table 8 and Table 9.

[0147] Among them, regarding W, an iron group metal, and an alloy of an iron group metal, X-ray diffraction is performed on the sintered material, and the amount thereof is identified by the peak ratio.

[0148] [Table 6]

[0149]

[0150] The samples marked with * in the table are comparative samples outside the scope of the present invention.

[0151] The samples marked with ** in the table are compositions containing 5 external mass % of Cr as *C.

[0152] [Table 7]

[0153]

[0154] The samples marked with * in the table are comparative samples o...

Embodiment 3）

[0170] As starting materials, (A): 20 parts by mass of Cu, (B): 79.5 parts by mass of W and 0.5 parts by mass of Ni, (C): 0.5 parts by mass of external SrB 2 o 4 , the leaching atmosphere from H 2 Change the atmosphere to H 2 The conditions other than the mixed atmosphere with Ar were set in the same manner as in Sample 1, and samples were produced. This sample was subjected to the same test and evaluation as Sample 1. The results are shown below, and it was confirmed that it can be suitably utilized as an electrode for electric discharge machining.

[0171] Processing speed 90.0mm / sec, consumption rate 8.9%, surface roughness 15.0Ry (μm)

[0172] This sample was referred to as sample 200 . Sample 200 was observed using EPMA mapping and X-ray diffraction, and Cu, W, W-Ni alloy, Sr 2 B 2 o 5 In comparison, there are places where Sr, Ni, W, and O are observed in the same portion. Here, research by X-ray diffraction confirmed that Sr(Ni·W) 0.5 o 3 and B 2 O. The peak ...

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Abstract

In electric discharge machining in which a Cu(Ag)-W(Mo) based electrode is employed, the present invention improves the machining speed, electrode wear rate, and surface roughness of an object to be machined. For this purpose, suitable amounts of an iron-group metal and a boric oxide of an element selected from the group (M3) comprising Mg, Ca, Sr, Ba, Sc, Y, and lanthanide are added to a Cu(Ag)-W(Mo) based material. For the boric oxide, a boric oxide represented by M32B2O5 or M3B2O4 is preferably used.

Description

technical field [0001] The present invention relates to an electrode for electrical discharge machining suitable as a machining electrode mainly used in die-cutting electrical discharge machining. Background technique [0002] As the electrode for electrical discharge machining, materials mainly containing non-metallic substances such as carbon, and materials mainly containing metals represented by Cu are mainly used. [0003] When using a carbon or Cu electrode for electric discharge machining, the machining speed can be easily increased by improving the discharge conditions, but the consumption of the electrode itself increases rapidly, and the shape of the electrode is reflected on the workpiece. Therefore, it is not preferable for applications requiring precision, for example, applications such as electrical discharge machining of cemented carbide parts for molds. In such a field requiring precision, a composite material of Cu or Ag, which is a good conductive material,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23H1/06C22C27/04C22C32/00C22C1/04
CPCB23H1/06C22C1/1094B22F3/26C22C32/0031B23H7/24C22C1/045C22C32/0089
Inventor 山口博文内田雄介
Owner NIPPON TUNGSTEN CORP
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