Method for processing fractured connecting rod for car engine

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 bein