A processing method for thin-walled small hole threads on the end face of sicp/al composite shaft parts

Abstract

The invention provides a processing method for thin-walled small hole threads on end surfaces of SiCp / Al composite shaft parts, mainly characterized in that a part of drilling force and tapping torque are borne by designing a clamping tool, so that forces borne by hole walls are reduced, and the problem that the thinnest hole walls are collapsed because the borne force is overlarge and exceeds the bearing strength of the hole walls is avoided; the drilling force and the tapping torque are reduced by using a CVD coated drill and a straight flute hard material TICN coating screw tap; and the processing for the small-hole threads on the end surfaces of the SiCp / Al composite shaft parts and parts with relatively short distances from the hole walls to the edges of the parts is realized by optimizing drilling process parameters and the like. The processing method has the beneficial effects that the problem that the thinnest hole walls are collapsed along the axis direction of holes when the end surfaces of shafts are directly drilled is solved, and the phenomenon that the hole walls generate edge breakage by an overlarge torque during tapping is overcome. The processing method is suitable for processing small holes in end surfaces of all shaft parts and parts with relatively short distances from hole walls to shaft walls.

Description

technical field [0001] The invention relates to the field of mechanical processing, in particular to a method for processing thin-walled small hole threads on the end faces of shaft parts made of novel composite materials SiCp / Al composite materials. Background technique [0002] Silicon carbide particle reinforced aluminum matrix composite (SiCp / Al) is a new type of composite material with high specific strength, high elastic modulus, high temperature resistance, wear resistance, small thermal expansion coefficient, good anti-magnetic and shock resistance, and dimensional stability Good and other advantages, the application prospect in the field of aerospace is very broad. However, due to the completely different physical and mechanical properties of the Al alloy matrix and the SiC particle reinforcement, the SiCp / Al composite material has become a typical difficult-to-machine material. Especially for the small hole thread on the end face of shaft parts and the distance be...

AI Technical Summary

Problems solved by technology

However, due to the completely different physical and mechanical properties of the Al alloy matrix and the SiC particle reinforcement, the SiCp / Al composite material has become a typical difficult-to-machine material.

Especially for the small hole thread on the end face of shaft parts and the distance between the hole wall and the edge of the part is small (less than 0.5mm), the direct drilling force of the ordinary drilling method is large, and the strength of the hole wall is reduced and the drilling force is easy to collapse. Through, the processing hole is incomplete

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