Triangular shaft sleeve machining method

Abstract

The invention relates to the field of machine tool machining, in particular to a triangular shaft sleeve machining method. The method comprises the steps that a test bar is obtained and detected; an inner circular hole of the test bar is machined; heat treatment is conducted on the machined test bar; semi-finish turning is conducted on a large outer circle and the inner circular hole; the test bar is clamped by adopting a first tool, and finish machining is conducted on the outer circle and two end surfaces of the test bar; and the test bar is clamped by adopting a second tool, and a special-shaped hole is cut through low-speed wire cutting. Before manufacturing, the quality of the test bar is detected, then the inner circular hole is machined to remove redundant allowance, then heat treatment is conducted to improve strength and reduce deformation, then semi-finish turning and finish machining are conducted to guarantee the machining quality, low-speed wire cutting and electric discharge machining are adopted, parts are not contacted, and the machining quality can be better controlled by means of the precision of equipment.

Description

technical field [0001] The invention relates to the field of machine tool processing, in particular to a processing method for a triangular bushing. Background technique [0002] The triangular bushing is the key part of this type of turbine product, which plays a role in transmitting torque during the operation of the machine. Such as figure 1 shown. [0003] The triangular bushing is installed on the main shaft, and matches the special-shaped hole on the main shaft through the ultra-long precision special-shaped hole in the inner hole, and plays the role of transmitting torque and power by utilizing the fitting area and matching accuracy between the special-shaped holes. The ultra-long precision special-shaped hole in the inner hole of the triangular bushing has high requirements for roughness and geometric tolerance accuracy. Combined with the machining performance and design requirements of the material itself, the processing method is greatly restricted, and the conve...

AI Technical Summary

Problems solved by technology

The ultra-long precision special-shaped hole in the inner hole of the triangular bushing has high requirements for roughness and geometric tolerance accuracy. Combined with the machining performance and design requirements of the material itself, the processing method is greatly restricted, and the conventional process plan is difficult. Guaranteed Design Requirements

If the roughness and shape and position tolerance requirements cannot be controlled, it will lead to large vibration of the whole machine, short life, low efficiency, and even safety accidents

[0004] This part has the following difficulties in the existing manufacturing scheme; 1. The material of the triangular bushing is 45CrNiMoVA, which is a low-alloy ultra-high-strength steel and requires a hardness of HRC40-44. Compared with milling, it is easy to cause tool wear. As a result, the machining results are unstable, and finally the requirements for the wear resistance of the machining tools are high; 2. The length-to-diameter ratio at the inner hole reaches 3:1, and the rigidity of the tool system in the milling process is difficult to meet the accuracy requirements; 3. The roughness and The precision of shape and position tolerance is high, which is difficult to meet by conventional milling; the special-shaped hole structure at the inner hole cannot be realized by conventional grinding, which puts forward new requirements for the formulation of processing plan

4. The alignment accuracy is low, and the coaxiality requirements of the inner hole and the outer circle cannot be guaranteed

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