High-precision shaft end-face hole system processing method based on double-reference conversion

Abstract

A high-precision shaft end face hole system processing method based on double-reference conversion is provided, and belongs to the technical field of machining. The method comprises the following steps: positioning pin hole I of A end face is machined in numerical control horizontal center; and the core shaft tooling is used to machine positioning pin hole II of B end face by using positioning pin hole I of A end face and center hole stop of both ends as references, and the phase is determined through horizontal alignment. The core shaft tooling comprises a core shaft, a rhombic positioning pin, an expansion sleeve, a gasket and a nut. The rhombic positioning pin is matched with the positioning pin hole I to determine the angular direction, the expansion sleeve is expanded to tightly expand the center hole of the workpiece to constrain the radial and rotational degrees of freedom, and the nut and the gasket constrain the axial degree of freedom. The present application realizes the precision machining of the hole system of both end faces under the same reference, avoids the precision loss caused by multiple clamping, and improves the machining efficiency and product qualification rate.

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