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Deformation Control of Carburizing and Quenching of Sliding Sleeve
DING Fuming
2022, 47(18):
153-158.
DOI: 10.16638/j.cnki.1671-7988.2022.018.031
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%.
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