Electrical discharge machining (EDM) method of super-hard micro-hemisphere couple part

A processing method and electric spark technology, applied in electric processing equipment, metal processing equipment, electrode manufacturing and other directions, can solve the problems of high machine tool requirements, grinding wheel wear, long processing time, etc., to improve processing efficiency, reduce electrode loss, reduce The effect of processing costs

Inactive Publication Date: 2011-08-17
HARBIN INST OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide an electric discharge machining method for superhard micro hemispherical couples, so as to solve the problems of rough machining of superhard micro hemispherical couples by grinding method, which has extremely high requirements on machine tools, serious grinding wheel wear, and long processing time. The problem

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  • Electrical discharge machining (EDM) method of super-hard micro-hemisphere couple part
  • Electrical discharge machining (EDM) method of super-hard micro-hemisphere couple part
  • Electrical discharge machining (EDM) method of super-hard micro-hemisphere couple part

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specific Embodiment approach 1

[0015] Specific implementation mode one: combine Figure 1 to Figure 12 Illustrate, the electrical discharge machining method of superhard micro hemispherical couple of this embodiment, described superhard micro hemispherical couple comprises two workpieces, and described two workpieces are respectively convex spherical hemispherical workpiece 1 and concave spherical hemispherical workpiece 2, The hardness HRC of the superhard micro hemispherical couple is 92-93; the electric discharge machining method is completed by the following steps:

[0016] Step 1: Design two electrodes (in order to obtain the required dimensional accuracy, shape accuracy and high processing efficiency, in EDM, it is necessary to scientifically design the electrodes and control the processing process. The size of the electrodes will be directly affect the final machining shape of the workpiece, and the process determines the machining efficiency and machining surface quality); the two electrodes are the...

specific Embodiment approach 2

[0025] Specific implementation mode two: combination Figure 9 and Figure 10 Explain that the concave spherical surface diameter of the concave spherical surface electrode 3 in step one of the present embodiment is 50 μm larger than the target machining diameter of the convex spherical surface hemispherical workpiece 1, and the concave spherical surface error of the concave spherical surface electrode 3 is 20 μm; the convex spherical surface diameter of the convex spherical surface electrode 4 It is 50 μm smaller than the target machining diameter of the concave spherical hemispherical workpiece 2 , and the convex spherical error of the convex spherical electrode 4 is 20 μm. The workpiece can obtain better surface precision, the peak-to-valley value (PV value) of the surface shape precision is about 2 μm, and the roughness of the processed surface is about 0.6 μm. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0026] Specific implementation mode three: combination Figure 9 and Figure 10 Explain that in step 3 of the present embodiment, the convex spherical hemispherical workpiece 1 starts to move, and the peak current of the electric discharge machining starts when it contacts the concave spherical electrode 3. The peak current is 20A, the pulse width is 50 μs, and the pulse interval is 100 μs; The peak current of electric discharge machining for concave spherical hemispherical workpiece 2 is 20A, the pulse width is 50 μs, and the pulse interval is 100 μs. The workpiece can obtain better surface precision, the peak-to-valley value (PV value) of the surface shape precision is about 2 μm, and the roughness of the processed surface is about 0.6 μm. Others are the same as in the first or second embodiment.

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Abstract

The invention provides an electrical discharge machining (EDM) method of a super-hard micro-hemisphere couple part, and relates to a machining method of a super-hard micro-hemisphere couple part, which is used for solving the problems of high requirements on a machine tool, severe wear on a grinding wheel and long machining time in the existing grinding method for roughly machining the super-hard micro-hemisphere couple part. The EDM method comprises the following steps: a concave spherical surface electrode and a convex spherical surface electrode are respectively designed; a first conducting copper bar is fixedly connected with a hemispherical workpiece with a convex spherical surface, the concave spherical surface electrode is clamped and fixed with two first V-shaped blocks and then is immersed in an operating fluid, the hemispherical workpiece with a convex spherical surface is connected to the positive electrode of a power supply, the concave spherical surface electrode is connected to the negative electrode of the power supply, and the hemispherical workpiece with a convex spherical surface moves to be contacted with the concave spherical surface electrode for EDM until the hemispherical workpiece with a convex spherical surface is machined into a target machining size; and the machining method of a hemispherical workpiece with a concave spherical surface is as the same as that of the hemispherical workpiece with a convex spherical surface, wherein, the hemispherical workpiece with a concave spherical surface is clamped and fixed with two second V-shaped blocks. The EDM method is used for machining the super-hard micro-hemisphere couple part on a high-precision dynamic pressure air bearing.

Description

technical field [0001] The invention relates to a processing method of a superhard micro hemispherical pair. Background technique [0002] The micro hemispherical couple used for dynamic pressure bearings adopts a new type of lightweight cemented carbide material, which has extremely high hardness (its HRC reaches 92~93), and has extremely high requirements on the shape accuracy and dimensional accuracy of the micro hemispherical couple. high. At present, the rough machining method of micro-hemispherical couples is generally adopted by the grinding method. On the one hand, in order to maintain the shape accuracy, this method has extremely high requirements on the machine tool (that is, the rotation accuracy of the workpiece axis and the grinding wheel axis, and the straightness of the guide rails of each axis. The requirements are extremely high); on the other hand, the wear of the grinding wheel is also relatively serious, and the processing is time-consuming, which has ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23H1/00B23H1/04B23H1/08
Inventor 赵清亮谢大纲房小艳陈俊云
Owner HARBIN INST OF TECH
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