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当前,汽车齿轮大都采用20CrMnTi材料,选用的基本工艺是:锻造—→正火—→车削—→插齿(滚齿)—→剃齿—→渗碳淬火—→磨削内孔和端面等。渗碳深度约为0.3m(模数),表面硬度为HRC58～64,心部硬度为HRC33～48。经过对部分齿轮热处理前、后的检测数据对比表明:热处理后齿轮的齿向、齿形、端面、外圆、内孔都有不同程度的变形,其变形又相互影响,内孔的变形会加大端面的变形,端面的变形会加大齿向和齿形的变形,其中齿向和齿形的变形对齿轮的精度影响最大。热处理后齿轮的齿向、
At present, the majority of automotive gears are made of 20CrMnTi materials. The basic process used is: forging - → normalizing - → turning - → gear shaper - → shaving - → carburizing and quenching - → grinding holes and end faces. Carburization depth of about 0.3m (modulus), the surface hardness of HRC58 ~ 64, heart hardness HRC33 ~ 48. After some of the gear heat treatment before and after the test data comparison shows that: after heat treatment gear tooth, tooth shape, face, cylindrical, bore have different degrees of deformation, the deformation and influence each other, the deformation of the hole will increase Deformation of the large end face, the deformation of the face will increase the tooth-shaped and tooth-shaped deformation, tooth profile and tooth-shaped deformation of the greatest impact on the accuracy of the gear. After the heat treatment gear tooth direction,