Quenching method for preventing major diameter sizes at two ends of splined hole of internal spline gear from being inconsistent

Abstract

The invention discloses a quenching method for preventing major diameter sizes at two ends of a splined hole of an internal spline gear from being inconsistent. The method comprises the following steps: a, firstly, sleeving the internal spline gear on a corresponding quenching dabber which is made from 45 steel in a two-section ladder structure and consists of an upper minor diameter section and a lower major diameter section, wherein the internal spline gear is installed on the minor diameter section in a sleeving manner and a center hole is formed axially on the quenching dabber; b, further threading a quenching dabber sleeved with the internal spline gear on a same supporting rod, wherein the quenching dabber above is supported on the below quenching dabber; and c, finally, quenching the internal spline gear which is treated in the step b. The method disclosed by the invention can be used for effectively preventing the cooling speeds at two ends of the internal splined hole from being inconsistent so as to ensure that the major diameter sizes at two ends of the internal splined hole are basically consistent, thereby guaranteeing the product quality and the yield. By adopting the quenching method, the yield of the internal spline gear is improved from original 30% to existing 95%.

Description

technical field [0001] The invention belongs to the field of processing and manufacturing of internal spline gears, and in particular relates to a quenching method for preventing inconsistency of large diameter dimensions at both ends of spline holes of internal spline gears. Background technique [0002] The internal spline gear is a widely used transmission part. In its quenching process, it is usually directly quenched. Due to the inconsistent cooling speed at both ends of the inner spline hole during the quenching process, the large diameters at both ends of the inner spline hole are different, resulting in out-of-tolerance and low product qualification rate. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a quenching method for preventing inconsistency of the large diameters at both ends of the spline hole of the internal spline gear, and to ensure that the large diameters at both ends of the internal spline...

AI Technical Summary

Problems solved by technology

Due to the inconsistent cooling speed at both ends of the inner spline hole during the quenching process, the major diameters at both ends of the inner spline hole are different, resulting in out-of-tolerance and low product qualification rate

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