High-precision spindle machining process

Abstract

The invention relates to the technical field of machining of high-precision spindles, in particular to a high-precision spindle machining process. The process includes the steps of 1, feeding; 2, normalizing; 3, roughing the external and drilling an inner bore in one end; 4, grinding a center hole; 5, finishing the external and a positioning groove; 6, rolling splines; 7, drilling positioning pin holes; 8, thermally treating, namely carburizing and quenching; 9, blasting shots; 10, straightening; 11, grinding the center hole after thermal treatment; 12, turning the positioning groove after thermal treatment; 13, finely turning the inner bore. A special fixture is used for clamping in the steps of spline rolling and inner bore fine turning, and various precision and machining requirements of the spindle are met.

Description

technical field [0001] The invention relates to the technical field of high-precision spindle machining, in particular to a high-precision spindle machining process. Background technique [0002] The main shaft is an important part of heavy-duty truck gearbox, which plays an important role in shifting gears and transmitting torque. Usually, heavy-duty vehicles have more than a dozen gear positions, and the main shaft is the main component for installing shift gears, so the main shaft has multiple positioning grooves for the axial positioning of the gears. [0003] In order to reduce the volume of the gearbox as much as possible, save space, and reduce weight, the gears of each gear are designed to be very compact, so the axial dimension accuracy of the gears is required to be very high, and the side of the positioning groove has vertical requirements. The main shaft has a very long involute spline, which is used for the sliding of the shifting sleeve to realize the function...

AI Technical Summary

Problems solved by technology

During the heat treatment process, the length of the main shaft will become longer, and the variable length is basically proportional to the length. The length of the common normal line of the spline will also increase due to heat treatment. At the same time, the main shaft will be bent and deformed. These factors will affect the dimensional accuracy of the main shaft. It has a great impact and brings great difficulties to the processing. It is difficult to guarantee the design requirements according to the normal process

[0005] Generally, one end of the main shaft is designed with an inner hole structure, which is used to install the universal joint mechanism. The inner hole has runout requirements, the bottom surface of the inner hole has vertical requirements, and the axial dimension between the inner hole bottom surface and the positioning groove is strict. The fixture is positioned and clamped so that the positioning reference is the same as the design reference, so that the design accuracy can be guaranteed. If the processing method of grinding the inner hole with the grinding wheel cannot guarantee the dimensional accuracy, the wear of the grinding wheel affects the accuracy of the aperture, resulting in inconsistent apertures and product quality. It is difficult to control; moreover, the production efficiency of grinding processing is low, and the requirements for processing personnel are high, which increases the cost of human resources

Images