Gas protecting means for preparing superhard abrasive material tools through induction brazing

Abstract

The invention discloses a gas protection unit for making superhard grinding medium tools with induction heating brazing, which is suitable for the brazing of the superhard grinding medium (such as diamond, cubic boron nitride) tools. The invention comprises a rack, an induction heating system, a gas protection system, a workpiece lifting system, and a workpiece rotating system. When in use, one or two or more protection gases among hydrogen, nitrogen, carbon monoxide, argon, helium are filled to the quartz clock cover, and can also be vacuumized to prevent the oxidation of the solder and the base when high temperature brazing, the damage of superhard material and the graphitization of diamond. When brazing, the workpiece rotate, rise and fall in the protection room, which can realize the proper position for the workpiece in the induction heating ring, thus the uniformization of temperature in the brazing area of the workpiece surface is ensured.

Description

technical field [0001] The invention relates to a welding machine, in particular to a gas protection device for induction heating and brazing of superabrasive (diamond, cubic boron nitride) tools. Background technique [0002] At present, superabrasive (diamond, CBN) tools mainly include electroplating tools, sintering (heat curing) tools and brazing tools. Electroplated superabrasive tools only rely on coating machinery to embed abrasives, and there is no bonding strength at the interface between superabrasives and coatings; sintered superabrasive tools are made by sintering compacts mixed with metal powder and superabrasive particles. There is neither infiltration nor bonding strength on the interface between the superabrasive and the matrix material. These two kinds of tool abrasives will fall off prematurely due to insufficient holding force during heavy-duty operations, resulting in low abrasive utilization and short tool life. In recent years...

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Problems solved by technology

[0005] The inventor of this patent has conducted in-depth and systematic research on the manufacture of superhard abrasive tools by brazing in a vacuum resistance heating furnace. The manufacture of various tools by brazing in a vacuum resistance heating furnace requires both heating equipment and high-vacuum equipment, and the cost is very high. , At the same time, in the production process, the time for vacuuming and heating and cooling in the furnace is long, resulting in a longer production cycle. Due to the slow heating speed, long-term high-temperature heating will have an adverse effect on the microstructure of the matrix and the performance of diamond abrasive grains.

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