Shifting fork cross hole machining process method capable of ensuring symmetry degree requirement

Abstract

The invention provides a shifting fork cross hole machining process method capable of ensuring a symmetry degree requirement. The technical core of the shifting fork cross hole machining process method is characterized in that the upper part and the lower part of a positioning pin hole are defined as a first pin hole and a second pin hole; the first pin hole is subjected to centering guide, drilling the first pin hole, and centering guide on the second pin hole, the first pin hole is drilled, the first pin hole and the second pin hole are simultaneously reamed by using a reamer, and then the machining of the positioning pin hole is completed. The positioning pin hole of the shifting fork is machined, secondary centering is used for guiding, the deviation of a hole machining tool in the machining process is overcome, the position degree of the machining cross hole is guaranteed, and the perpendicularity deviation is guaranteed to be less than 0.05 mm, and the deviation of the symmetry degree is smaller than 0.08 mm; and the machining process is stable, and the rejection rate is greatly reduced; the shifting fork cross hole and the like machined by adopting the method has a general application value, and the method can be applied to all similar products.

Description

technical field [0001] The invention proposes a processing method for shift fork cross holes that guarantees symmetry requirements, and is used in the processing technology of shift fork parts in automobile gear shifting mechanisms to overcome the drift of drilling tools when processing arc surfaces and ensure the processing of cross holes Comply with drawing requirements. Background technique [0002] The shift fork is a part of the automobile gearbox, which belongs to the gearbox control transmission mechanism. The structure of a shift fork is as follows: figure 1 As shown, the axis of the positioning pin hole 2 is perpendicular to the axis of the shift fork shaft hole 1, the hole diameter of the positioning pin hole 2 is 6 mm, and the hole diameter of the shift fork shaft hole 1 is 16 mm; the positioning pin hole 2 passes through the shift fork shaft hole 1. The shift fork shaft hole 1 divides the positioning pin hole 2 into two parts to form a cross hole (intersecting h...

AI Technical Summary

Problems solved by technology

In the actual processing, the drill bit for processing the positioning pin hole is relatively thin, and the drill bit is not easy to center during processing. After processing, the vertical and symmetric degrees are measured at 0.2-0.3 mm, and the integral carbide drill bit is used to pre-center the tool inlet on the shift fork. hole, the position (perpendicularity, symmetry) has been improved to a certain extent, but it still cannot meet the requirements of the drawing; through analysis, it is caused by the inaccurate centering of the inner wall of the shaft hole of the shift fork when the tool is processing the lower pin hole.

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