Technique for processing connecting rod bearing shell

Abstract

The invention discloses a processing technique of a connecting rod bush. According to working procedure sequence, the processing technique of the connecting rod bush includes the following steps: casting a rough part which needs to be provided with a technical chuck; placing the rough part in open air alone for 50-70 days for natural inactivation; milling the rough part into two halfliners, and placing the halfliners in a workshop for 35-45 days for natural inactivation; combining the two halfliners into a whole by a clamping band, roughly lathing an internal circle and an external circle and keeping a margin of 5-7mm; roughly milling a bush mouth; placing the bush in a processing workshop alone for 3 days for natural inactivation; semi-finish turning of the internal circle and the external circle; semi-finish milling of the bush mouth; lathing an anti-change groove on the technical chuck, correcting and finely turning the internal circle and the external circle, with machining precision being IT8-IT5, and cutting off the technical chuck; drilling an assemble hole of the connecting rod bush and righting the shape of the assemble hole; finish-milling the bush mouth and a bush mouth inclined plane. The invention provides a processing technique of a connecting rod bush product which has long service life and can lead to high running precision of a crank link mechanism.

Description

(1) Technical field [0001] The invention relates to a processing technology of a connecting rod shoe, in particular to a processing technology of a connecting rod shoe satisfying the movement precision and service life of various crank connecting rod transmissions. (2) Background technology [0002] At present, various crank-link transmission mechanisms are widely used in industries such as automobiles, aviation, aerospace, and home appliances, and especially occupy an important position in the automobile industry and aerospace manufacturing. The connecting rod bush is located at the connecting part of the piston lever and the crankshaft, which plays the role of connection and support, and its function is similar to that of the bearing. As a connecting part of a high-speed running component and a supporting part with a large load, the machining accuracy of the connecting rod bushing and its internal stress form have a major impact on the motion accuracy and service life of t...

AI Technical Summary

Problems solved by technology

As far as my country's existing connecting tile processing technology is concerned, it mainly includes the following processes: casting blank - natural failure - rough turning - semi-rough boring - drilling, milling inclined surface - inspection, which only includes a natural Failure, this process is mainly to eliminate work hardening and eliminate internal stress. In subsequent processing, work hardening will still occur. If there is no such step, the mechanical properties of the connecting tile must be severely reduced; in addition, its cutting process only includes large progress. The rough turning of the knife and the rough boring of semi-finishing are difficult to guarantee the machining accuracy of the workpiece, and because the connecting rod tile is a precision device with a technical requirement of not less than 7 grades, the existing processing technology cannot meet the required The machining accuracy is high, the friction coefficient is relatively large, the wear resistance is relatively poor, and the service life cannot even be counted in years.

Although there are no macroscopic defects, their microstructures are very different, which affects the transmission accuracy and service life of the crank connecting rod mechanism

In addition, the current processing procedure is usually to process the connecting rod tile as a whole first, and then cut it into two half tiles. Although this solution is easy to process in the middle process, because the final process is the cold processing process of cutting the two half tiles, it is very easy. Even if the orthopedic process is added, the orthopedic accuracy cannot be guaranteed due to the deformation of the half-tile structure. Moreover, due to the process of splitting into two half-tiles, the internal stress situation of the finished product is easily complicated, and the cold work hardening is more serious.