关键词: 啮合套；渗碳淬火；变形控制；变形量；摆放姿态

Abstract: Sliding sleeve is an important part of the differential lock mechanism between the wheels of the automobile drive axle, which will be affected by the impact load of the relevant parts in the process of use, so it is required to adopt carburizing and quenching to improve the strength of the sliding sleeve in the product design. In the production process, it was found that the carburizing and quenching process of the product would lead to 50% of the workpiece deformation, and the size of spline span bar distance was not qualified, so it could not be assembled and scrapped. In order to control the deformation of sliding sleeve in the process of machining, the main reason for the deformation and disqualification of workpiece was determined by the process tracking and a large number of experimental data analysis. The workpiece in bulk was counterpressed around each other, and the strength of the workpiece was reduced after the complete austenitizing, and the counterpressure led to the deformation of the workpiece. At the same time, during the quenching process, the workpiece was subjected to external forces, resulting in inconsistent shrinkage of the span bar distance, and the ellipticity was out of tolerance. By studying the way of loading the workpiece, increasing the layer, eliminating the mutual resistance force between the workpiece and changing the placement posture, the deformation of the workpiece was effectively controlled, to ensure that the deformation of the workpiece after carburizing and quenching was controllable. In line with the process requirements, the qualified rate reached 100%.

Key words: Sliding sleeve; Carburizing and quenching; Deformation control; Deformation; Placement posture