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Process for machining electric spark small hole by using compound electrode

A composite electrode and processing technology, applied in electric processing equipment, electrode manufacturing, metal processing equipment, etc., can solve the problems of rising processing costs, no very effective solutions, affecting finishing, etc. Realize the effect of mature electroplating process

Inactive Publication Date: 2011-10-05
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The bell mouth of the small hole is a fatal problem in EDM, and it is the key to affect the EDM process for hole finishing, but so far there is still no very effective solution
In order to improve the chip removal conditions during small hole machining and ensure the stability of the machining process, an electromagnetic vibrating head is often used to vibrate the tool electrode in the axial direction, or an ultrasonic vibrating head is used to make the end face of the tool electrode vibrate at high frequency in the axial direction for EDM Ultrasonic composite machining can improve the chip removal conditions of small hole processing and improve the efficiency of small hole processing, but these methods often need to add additional devices, resulting in an increase in processing costs

Method used

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  • Process for machining electric spark small hole by using compound electrode
  • Process for machining electric spark small hole by using compound electrode
  • Process for machining electric spark small hole by using compound electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0019] The brass tubular composite electrode plated with chrome on the surface is prepared by electroplating, the degreased brass tubular electrode and the lead plate are placed in the plating tank filled with chromic acid plating solution, and the brass tubular electrode is connected to the negative pole of the DC power supply as Cathode; the lead plate is connected to the positive pole of the DC power supply as the anode, and the chromium ions in the chromic acid plating solution are electron-reduced to metal chromium atoms on the brass cathode, and the surface of the brass electrode is chromium-plated to form a chromium-plated brass Tubular composite electrode, the concentration of chromic acid plating solution used in the plating tank is 250g / L, and the current density of direct current is 60A / dm 2 , the area ratio of the cathode and anode plates is 1:10; the electroplating temperature is 60°C, and the coating thickness is 0.04mm;

[0020] Use a brass tubular electrode wit...

Embodiment approach 2

[0026] The concentration of the chromic acid plating solution used in the plating tank is 250g / L, and the current density of the direct current is 30A / dm 2, the area ratio of the cathode and anode plates is 1:5; the electroplating temperature is 40°C, and a new brass tubular electrode with an outer diameter of φ1.5mm and an inner diameter of φ0.3mm and a new brass tubular electrode with an outer diameter of φ1.54mm and an inner diameter of After processing the new chrome-plated brass tubular electrode of φ0.3mm for 5 minutes, the processed end of the comparison electrode is as attached Figure 5 shown. attached by Figure 5 It is obvious that after processing for a certain period of time, the processed end face of the composite electrode still maintains good cylindricity, while the processed end of the single brass electrode has a large taper, and there are obvious erosion gaps, which fully shows that the composite electrode can Improve the bell mouth problem of EDM. Others...

Embodiment approach 3

[0028] The concentration of the chromic acid plating solution used in the plating tank is 250g / L, and the current density of the direct current is 40A / dm 2 , the area ratio of the cathode and anode plates is 1:8; the electroplating temperature is 50°C, and the brass tubular electrode with an outer diameter of φ3.0mm and an inner diameter of φ0.47mm and a brass tubular electrode with an outer diameter of φ3.04mm and an inner diameter of φ0. The 47mm chrome-plated brass tubular electrode is used for small hole EDM processing on a D703F high-speed small hole EDM machine tool. During processing, the positive electrode of the pulse power supply is connected to the workpiece to be processed, the negative electrode is connected to the tool electrode, the working fluid is tap water, the pressure is 4Mp, the workpiece to be processed is a stainless steel plate with a thickness of 7.8mm, the rotation speed of the tool electrode is 120 rpm, and the processing voltage is 25V. The current ...

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Abstract

The invention provides a process for machining an electric spark small hole by using a compound electrode and belongs to the field of nontraditional machining. The process is characterized in that: metal chromium of which the melting point is higher than that of an inner basic material is electroplated on the outer surface of a brass tubular electrode so as to form the brass and chromium compounded compound electrode and the electric spark small hole is machined by using the compound electrode. The process has the advantages that: the compound electrode is adopted during the electric spark small hole machining, so the machining speed can be increased; and the taper of the electrode machining end of a tool is reduced by using the characteristic that the electrical erosion amount of the center of the compound electrode is larger than that of the edge, so the horn mouth of the machined hole becomes smaller. The technical scheme is economic and is easy to realize; furthermore, by smaller investment, the machining speed and the machining quality of the electric spark small hole can be increased greatly; and the process has practical value and an economic benefit.

Description

technical field [0001] The composite electrode EDM small hole machining process of the invention belongs to the field of special processing, and specifically relates to a technical scheme for improving the EDM small hole processing speed and processing quality by using copper-chromium composite electrodes for EDM small hole processing. Background technique [0002] Since the advent of EDM technology in the 1940s, it has become a relatively mature technology through continuous development and progress. It is widely used in civil, national defense and other fields, and has an irreplaceable position and role in the modern manufacturing industry. Compared with other processing methods, EDM is not limited by the hardness of materials, so EDM has obvious advantages in the processing of difficult-to-machine materials. Nevertheless, this technology still has defects such as low material removal rate, easy wear of electrodes, and high surface roughness values. [0003] The high-spee...

Claims

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Application Information

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IPC IPC(8): B23H9/14B23H7/22
Inventor 曹明让杨胜强杨世春刘书福
Owner TAIYUAN UNIV OF TECH
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