On 2018-08-08 14:48:54
Tool vacuum heat treatment technology
The advantages and history of tool vacuum heat treatment technology
The cold-wall vacuum heat treatment furnace for oil and gas quenching and cooling began to be developed in the 1970s, and was successively produced in batches in the 1980s. At present, local manufacturers have been able to provide a series of vacuum heating, oil and gas quenching furnace, low pressure carburizing furnace, 1MPa(10bar) high pressure gas quenching furnace, vacuum sintering furnace, and brazing furnace. The maximum temperature of vacuum quenching and high-pressure gas quenching furnace can reach 1350℃, and the maximum temperature of vacuum sintering furnace can reach 1800℃.
The output of each kind of furnace and furnace type is above 200. In recent years, the development of aviation industry and mold industry has a great demand for vacuum heat treatment furnace, vacuum brazing furnace, especially vacuum heating high-pressure gas quenching furnace, which promotes the prosperity of vacuum equipment manufacturing industry. The combination of low pressure carburizing and high pressure gas quenching technology provides a new way to prolong the life, reduce the distortion and reduce the noise of the vehicle gear. At the beginning of the new century, several domestic automobile and diesel engine gear manufacturers have introduced such equipment and production lines.
Because of the high demand of 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 and east China, some large-scale private heat treatment processing enterprises have at least one 0.4mpa (up to 6) vacuum heating high-pressure gas quenching furnace. In the cutting tool industry, CNC and machining center widely used, strong requirements for high quality and long life of the tool, the city of environmental protection also put forward more stringent requirements for heat treatment, vacuum heating high-pressure gas quenching has therefore become the preferred process for high speed steel tool heat treatment instead of salt bath heating and quenching.
In order to meet the strict requirements of international environmental standards, the concept of circular economy of comprehensive utilization of wood and continuous supply of raw materials has promoted the rapid development of wood processing industry. Therefore, rizhao longte mechanical tool research and development of woodworking tool vacuum heat treatment and cryogenic technology. The technology has been applied to longte mechanical tool products, and will be exhibited in the 12th international exhibition of woodworking machinery and furniture production equipment.
The tool vacuum heat treatment technology has a series of outstanding advantages:
Vacuum heat treatment has the function of preventing oxidation. The surface does not oxidize, does not decarburize, and has the reduction derusting effect, saves the tool rough machining process, may save the expensive tool steel and the raw material consumption, saves the processing time, reduces the product cost;
Vacuum heat treatment with vacuum degassing, degreasing without hydrogen embrittlement risk, prevent the tool material refractory metal surface embrittlement, make the tool material surface purity, improve the tool fatigue strength, plasticity, toughness and corrosion resistance, improve the tool service life;
Vacuum heat treatment has a small quenching deformation, which can reduce the existence of correction stress for conventional quenching deformation and reduce the possibility of fracture during the use of the blade. The deformation of the vacuum heat treatment blade is 1/2 to 1/10 of that of the salt bath quenching.
The stability and repeatability of vacuum heat treatment process are good. Once the process is determined, the heat treatment operation will run automatically as soon as the process is entered. Avoid tool quality fluctuation caused by unstable process of conventional heat treatment;
The vacuum heat treatment consumes less power, the power consumption is 80% of the conventional heat treatment, the production cost is low, but the one-time investment cost is large.
Vacuum heat treatment operation is safe, high degree of automation, good working environment, pollution-free and pollution-free, in line with the requirements of clean production and sustainable development of China's industrial enterprises.
The application of cryogenic technology in tool products has evolved from die industry applications. Cryogenic treatment and heat treatment, it and material characteristics, treatment temperature, treatment speed has a great relationship, different treatment methods have significantly different effects. Cryogenic technology is on the material in the below - 130 ℃ for processing technology of a kind of method, cryogenic treatment can not only significantly increase the mechanical properties and service life of cutting tools, stable size, improve, reduce the deformation uniformity, and easy to operate, does not destroy the artifact, no pollution, low cost, is of great help to improve the quality of our knives.