.42 Of Crmo Steel Crankshaft Runout Ultra Poor Straightening Technology Feasibility Study

Crank of internal combustion engine is one of key components of powerplant of motor , train , ship and so on traffic equipment. Goodness or badness of crank quality will directly influence service life of internal combustion engine, and relate to their safe and reliable operation. Fatigue fracture of internal combustion engine crank is important reason of accident in the process of equipment operation. Crank of internal combustion engine after every process and hot surface treatment will produce fairly deformation , that is jumping overproof. So alignment without destroy for its tissue and property is important factor which ensure operation of crank safely.42CrMo steel crank possess high proportion in the manufacture of crank. The research as a example of 42CrMo steel crank, study feasibility and dependability of jumping measurement overproof alignment technology for crank.A realistic and important question for manufacture and user of crank is how to settle the question jumping overproof of crank under the condition of crank without influence.The subject for different process technology and surface treatment of crank takes tracking checkout for its internal stress, analyses relation of jumping measurement , deformation measurement, recovery measurement and stress change , finds the reason and usual law of jumping overproof of crank .Through cold pressure alignment, hot pressure alignment , support aged alignment and so on methods for 42CrMo steel crank , the subject checks change of stress in the process of alignment and change of tissue and property after alignment for crank, and gives comprehensive evaluation for every alignment technology , then give safe and feasible technology parameter.