Popularization of vacuum heat treatment technology
In the 1970s, oil- and gas-quenched cold-wall vacuum heat treatment furnaces were developed. In the 1980s, they were mass-produced in series. At present, local manufacturing companies have been able to provide vacuum heating, oil and gas quenching furnaces, low pressure carburizing furnaces, 1 MPa (10 bar) high pressure gas quenching furnaces, vacuum sintering furnaces, and brazing furnaces. The maximum temperature of vacuum quenching and high pressure gas quenching furnace can reach 1350 °C, and the vacuum sintering furnace can reach up to 1800 °C. The output of various types of furnaces and furnaces is more than 200. In recent years, the development of the aviation industry and the mold industry has a large demand for vacuum heat treatment furnaces, vacuum brazing furnaces, especially vacuum heating high pressure gas quenching furnaces, which has promoted the prosperity of the vacuum equipment manufacturing industry. The combination of low-pressure carburizing and high-pressure gas quenching technology provides a new way for the life extension, distortion reduction (variation) and noise reduction of vehicle gears, and the development of semi-continuous production lines embodying this advanced technology is the mass production of automotive gears. Technical modifications to heat treatment offer the possibility. At the beginning of the new century, several domestic and diesel gear manufacturers have introduced such equipment and production lines.
Due to the high requirements of surface quality and distortion of the mold, vacuum high pressure gas quenching has almost become an irreplaceable technology for mold heat treatment. At present, in the coastal areas of South China and East China, a small-scale private heat treatment processing enterprise has at least one vacuum heating high-pressure gas quenching furnace of 0.4 MPa (maximum of 6). In the Cutting Tool industry, the wide application of CNC and machining centers strongly demands that the tools have high quality and long life. The environmental protection of the city also imposes stricter requirements on heat treatment. Vacuum heating and high-pressure gas quenching have become the substitutes for heat treatment of high-speed steel tools. The preferred process for bath heating and quenching.
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