Coaxiality precision machining guarantee method of long-overhanging combination machining part

Abstract

The invention discloses a coaxiality precision machining guarantee method of a long-overhanging combination machining part. According to the method, a tool is manufactured, the bottom surface of the tool is fixed on the worktable top of a numerical control machine tool by a pressing plate, a workpiece zero point is built by taking a tool counter bore as a circle center, an upper end surface counter bore and the end surface of the tool and the outer circle and the bottom surface of a combination machining part support are matched, fastened and clamped by a pressing plate, the upper surface of asupport part and a small circular shaft part are fastened by four screws, a dial indicator is fixed onto a spindle of the numerical control machine tool, external diameter run-out degree of a small circular shaft is aligned in 0.1mm according to machining zero point tagging, the external diameter of the small circular shaft part is machined by a cylindrical boring cutter, the dial indicator is fixed onto the spindle of the numerical control machine tool, coordinate difference values delta 1, delta 2, delta 3 and delta 4 between the external diameter of the small circular shaft part and the external diameter of the support part are measured and recorded according four directions in a coordinate system of a machine tool workpiece, every two directions are separated by 90 degrees, the four screws are loosened to adjust positions of the small circular shaft, so that delta 1, delta 2, delta 3 and delta 4 measuring values are approximately equal, a maximum mutual difference value is in 0.005mm, and geometric tolerance requirements of the part are ensured by fastening the four screws.

Description

technical field [0001] The invention belongs to the technical field of mechanical processing, and in particular relates to a coaxial precision processing guarantee method for long overhang combined processing parts. Background technique [0002] The structural characteristics of a long overhang combined processing part are as follows: the combined processing part is composed of a base bracket part and a small round shaft part above, the base is a bracket part, the lower bottom surface is the datum plane B, and the axis is the datum A; There is a small round shaft part mounting surface on the upper end of the bracket part, and the small round shaft part and the upper end surface of the bracket are connected by 4 screws and positioned by 2 pins; the bracket part and the small round shaft part are processed separately, and the outer diameter of the small round shaft part is left A certain margin is required to ensure the verticality requirements of the outer diameter of the sma...

AI Technical Summary

Problems solved by technology

[0005] Because the original processing method needs to disassemble the parts, it increases the time for checking the measurement deviation; after the second clamping, there is a reference translation error; modify the NC machining

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