Adopt the new quenching medium and improve quenching method

1 to improve the original quenching medium, USES the new type of quenching medium quenching medium is an important guarantee of the implementation of quenching process, a great influence on the quality of the workpiece after heat treatment. Correct selection and reasonable use of quenching medium, can reduce the workpiece deformation, prevent craze, to guarantee required by the organization and performance. Commonly used in heat treatment production, quenching medium such as water, oil, salt, they each have advantages and disadvantages. For example, water is the most widely used, the most economical and strong cooling capacity of quenching medium, but it is in the low temperature cooling speed, easy to deformation and cracking; When the water temperature more than 40 ℃, the cooling speed is reduced, and easy to make the workpiece quenching. And as oil quenching, although to reduce the workpiece deformation and cracking is very good, but for poor hardenability or large size workpiece quenching is not hard, aging, and oil pollution on the surrounding environment, there is a risk of fire. Therefore, to improve the performance of original quenching medium, and actively develop application cooling rate between oil and water, and cooling speed can be adjusted according to need, at the same time economic, security, a new type of quenching medium from pollution. Inorganic solution hardening agent and organic polymer quenchant is the development of new type of quenching medium, especially the research and application of organic polymer quenchant is striking, its advantage is non-toxic, smokeless and odorless, no corrosion, no combustion, anti-aging, the use of safe and reliable, and the cooling performance is good, the cooling speed is adjustable, wide applicable scope, the workpiece hardening evenly, can obviously reduce the quenching distortion and cracking tendency. From raising the workpiece quality, improve labor condition, avoid fire and energy saving point of view, organic polymer quenchant has gradually replaced the trend of quench oil, is the main development direction of quenching medium, especially for water quenching crack, deformation, oil quenching is not hard artifacts, using organic polymer quenchant is successful. At present, the world's most used is poly (alkyl glycol ( PAG class) Quenching medium, it has inverse solubility, between the salt water and the cold oil cooling speed, wide applicable hardening steel, long service life. And polyacrylic acid salt ( ACR class) Hardening agent, polyethylene oxide pyrrolidone ( PVP class) Hardening agent and poly (ethyl oxazoline ( The PEO class) Quenching medium, etc. , have a certain degree of application. Over the years, our country in terms of research and application of quenching medium, do a lot of work, has obtained certain achievements, basically meet the needs of the heat treatment production, but compared with foreign advanced level difference is very big, and lagged behind other heat treatment technology in the field of development, is a weak link in heat treatment industry, should be given attention and strengthen in the future. 2 improve old quenching method, using the new method of quenching in order to achieve the ideal cooling of components, get the best quenching effect, according to the requirements of the artifacts used materials, technology, service condition, etc. , to select appropriate quenching medium, still need to continue to improve the existing quenching method, and USES the new quenching method. Such as using the high pressure gas cooling quenching method, strong quenching method, flow bed cooling quenching method and water mixture air cooling method, boiling water quenching method, hot oil quenching method, cryogenic treatment method, etc, all can improve the cooling performance of quenching medium, uniform workpiece cooling, to get good hardening effect, effectively reduce the workpiece deformation and cracking.