Electrode preparation process for depositing diamond abrasive tool with electric sparks

Abstract

The invention relates to an electrode preparation process for depositing a diamond abrasive tool with electric sparks, comprising the steps of: dipping a diamond abrasive material into anhydrous ethanol for ultrasonic cleaning; then dipping a diamond in industrial aluminum sol for 5 min; fishing out the abrasive material with a copper wire mesh; repeating the steps twice after the abrasive material is dried; placing surface-modified diamond into a box-type furnace; raising temperature to 700 DEG C at a temperature rise rate of 5 DEG C per min; keeping warm for 1 h, cooling together with the furnace to obtain the diamond abrasive material with an Al2O3 coating coated on the surface; uniformly mixing the diamond abrasive material, cobalt powder, copper powder, tungsten carbide powder and silver powder in the mass ratio of 25: 20: 40: 10: 5 under ball milling conditions; adding a mixed electrode raw material to a cylindrical graphite die, wherein the inner bore diameter of the die is 20mm; sintering the cylindrical graphite die on an SM80 sintering machine, wherein the pressure at two ends of the die is 15KN, the voltage is 10V; keeping warm for 5 min when the temperature reaches 800 DEG C, stopping heating the die; and cooling naturally to obtain an electrode material. The electrode material structure prepared by utilizing the process has favorable consistency and high diamond abrasive material content; and the diamond abrasive tool with uniform structure and high abrasive material concentration can be deposited by utilizing the electrode.

Description

technical field [0001] The invention relates to an electrode preparation technology for electric spark deposition. The electrode is used as an anode, and the grinding wheel substrate is used as a cathode, and a working layer of metal bond diamond grinding tool is deposited on the grinding wheel body by using electric spark discharge. Background technique [0002] At present, the preparation of diamond abrasive tools by EDM is still in the research and development stage and has not been widely used in industry. The metal anode used in EDM is prepared by mixing metal powders of different components and diamond abrasives uniformly, then cold-pressing them under certain pressure conditions, and then sintering the formed body under a protective atmosphere with a certain heat treatment system to obtain deposition. Use an anode. The density of the electrode material prepared by this process has a great relationship with the molding pressure and sintering temperature, the process r...

AI Technical Summary

Problems solved by technology

The density of the electrode material prepared by this process has a great relationship with the molding pressure and sintering temperature, the process repeatability is poor, and the diamond in the electrode component is not protected by inorganic coating, and it is easy to oxidize and fail under the high temperature of deposition. The electric discharge deposition process requires the electrode to have a small resistance, so the wire process cannot add high-content diamond to the electrode, so it is impossible to produce high-abrasive-concentration diamond abrasive tools

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