In the 1970s, the oil and gas quenching and cooling cold-wall vacuum heat treatment furnace began to be developed, and it was mass-produced in series in the 1980s. At present, local manufacturing enterprises have been able to provide a series of vacuum heating, oil and gas quenching furnaces, low pressure carburizing furnaces, 1MPa (10bar) 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℃, and that of vacuum sintering furnace can reach 1800℃. The output of various furnace types and furnace types is more than 200 sets. In recent years, the development of the aviation industry and the mold industry has put a lot of demand on vacuum heat treatment furnaces, vacuum brazing furnaces, especially vacuum heating and high pressure gas quenching furnaces, which has promoted the prosperity of vacuum equipment manufacturing. The combination of low-pressure carburizing and high-pressure gas quenching technology provides a new way for vehicle gears to extend life, reduce distortion (distortion) and reduce noise. The development of a semi-continuous production line that embodies this advanced technology is a mass production of automotive gears. The technical transformation of heat treatment provides the possibility. At the beginning of the new century, several domestic automobile and diesel gear manufacturers have introduced such equipment and production lines. Stainless steel spring
Due to the high requirements of molds for surface quality and distortion, 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, large-scale private heat treatment processing enterprises have at least one 0.4MPa vacuum heating and high-pressure gas quenching furnace (the largest number is 6). In the cutting tool industry, the wide application of CNC and machining centers strongly requires tools with high quality and long life, and urban environmental protection also puts forward stricter requirements on heat treatment. Vacuum heating and high pressure gas quenching has therefore become a substitute for high-speed steel tool heat treatment. The preferred process for bath heating and quenching.