The Ⅱ-Ⅲ shift fork is an important part of the car. During the working process, the Ⅱ-Ⅲ shift fork is subjected to huge frictional force, so it wears out quickly. For this purpose, ultrasonic annealing equipment is used for quenching heat treatment.
Due to the complex shape of the II-III shift fork, the thin wall and the rapid cooling of the corners and thin edges during quenching, the outer surface cools faster than the inner surface, which causes heat treatment stress and uneven distribution of the hardened layer, resulting in a larger part. quenching deformation.
Water has a strong cooling capacity at room temperature, and is generally suitable for quenching medium that requires little deformation; while oil is used as the quenching medium, it is required that the quenched parts have high hardenability, small difference in wall thickness, and shape. Complicated, long and complicated process; in addition, AQ-251 (mainly composed of polyglycol) from Houghton Company of the United States is selected as the quenching medium. When the hot parts are in contact with the polyglycol aqueous solution, a film is deposited on the surface of the parts , Delay the cooling rate of parts, thereby reducing the risk of deformation and cracking of parts. Its cooling rate is lower than that of water but higher than that of oil, and the quenched workpiece can be tempered directly without cleaning. Considering the particularity of the structure of the Ⅱ-Ⅲ shift fork, in order to reduce the quenching deformation of the fork mouth, AQ-251 is selected as the quenching media.
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GS-ZP-1200
