Method for processing fractured connecting rod for car engine

Abstract

The invention discloses an expansion-breaking processing method of a connection rod used for an automobile engine which is also applied to the processing of the connection rods of a diesel engine, a barge engine, etc. The method is mainly characterized by adopting a technical flow as follows: processing the upper plane and the lower plane of the connection rod; machining a small end hole; boring a small end hole and a big end hole; drilling a bolt hole and tapping; drawing an expansion-breaking stress slot; expansion-breaking; assembling; preciously boring the small end hole and the big end hole; preciously milling the small end hole and the big end hole, detecting, etc. Practical applications proves that the method reduces accumulated errors, thus effectively improving the use performance of a connection rod assembly; reducing working procedure and processing precision as well as improving efficiency; the method adopts a common device and a special clamp to finish the expansion-breaking processing, thus being applied to the multi-variety small-batch production of the connection rod and simultaneously reducing the investment risk.

Description

1. Technical field [0001] The invention relates to a mechanical processing technology, which is mainly applicable to the processing of connecting rods of automobile engines, and also applicable to the processing of connecting rods of diesel engines, yacht engines and the like. 2. Background technology [0002] Usually the processing method of connecting rod body and connecting rod cover (see Figure 1), the connecting rod is mainly composed of small head hole 1, connecting rod body 2, bolt 3, slip groove 4, joint surface 5, connecting rod cover 6, nut 7 , upper and lower planes 8, big head holes 9, and bolt holes 10 etc. are formed. Its main technological process is: processing the upper and lower planes 8 of the connecting rod; sawing off the connecting rod cover 6 and the connecting rod body 2; milling and grinding the joint surface 5 of the connecting rod body and the connecting rod cover; The rod body 2 and the connecting rod cover 6 are combined with the big head hole 9...

AI Technical Summary

Problems solved by technology

But the disadvantages are: 1. There are many processes, multiple clamping and positioning during the processing process, resulting in a large cumulative error, which affects the accuracy and quality of the product; ) should be left with a margin of 4-6mm for sawing according to the process requirements; 3. The assembly of the connecting rod body and the connecting rod cover should be positioned and tightened by bolts, thereby affecting the accuracy of the bolt holes and the accuracy of the bolts. High manufacturing precision is required, and the bolts must be high-strength bolts that can withstand shear force and positioning accuracy requirements

4. The material used for the connecting rod is alloy structural steel, and the forging blank must be quenched and tempered, which increases the cost of heat treatment

The price of special-purpose equipment is very expensive, about 12 million yuan per set. If a special equipment for expansion-breaking connecting rods is used, it cannot cover various types of connecting-rod assemblies. Multiple sets of special-purpose equipment for expansion-breaking connecting rods are needed to meet the requirements. This kind of equipment investment is risky and does not conform to my country's national conditions.

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