Research And Development Of The Connecting Rod Of LG40CrS Automotive Engine

With the development of the domestic and foreign automobile technology,higher and higher demands are proposed on the performance of the engine,connecting rod is one of the key parts of the engine,connecting rod needs to have high strength,lightweight,machinability and so on technical requirements.The traditional connecting rod is usually made of 45#carbon steel,40Cr,35CrMoA,42CrMoA,etc.,as well as non-adjustable steel including 35MnVS,C70S6,SVdH20S1,S45CVMn,etc.Materials in recent years,the national science and technology workers found that 35 MNVS,C70S6,SVdH20S1,S45CVMn nonquenched and tempered steel such as strength generally under 900 mpa,the strength of the carbon steel guitar generally under 800 mpa,40 cr,35 crmoa,42 crmoa quenched and tempered steel although strength level greater than 900 mpa,but its poor machinability,can be processed.This research mainly in the face of domestic and broad engine connecting rod market in shandong province,and the research and development of high strength quenched and tempered with engine connecting rod steel,good cutting performance,can be processed at the same time.According to the request of connecting rod technology and actual working condition of the composition design,uniformity of material,metal flow and fatigue performance of research,could satisfy the requirement of user technology developed high strength and conditioning connecting rod steel.The results showed that:(1)Using 50 tons of electric furnace smelting--LF refining--VD vacuum treatment--continuous casting--rolling process development of LG40CrS connecting rod with steel,reasonable and advanced production technology,accurate and feasible operation of technology and technical operation.(2)Developed by LG40CrS connecting rod with toughened learn composition design is reasonable,it’s tensile strength reached more than 1000 mpa,far higher than 45 carbon steel guitar,35 MNVS,C70S6,SVdH20S1,S45CVMn,such as the intensity of non quenched and tempered steel,with high purity and good uniformity,heat treatment of stable performance,strong plastic matching is good wait for an advantage,through the connecting rod forging metal streamline with users to carry out the test,the fatigue life test,cutting performance experiments showed that satisfied the tin LG40CrS connecting rod steel wood such as technical requirements for the domestic each big engine makers meet the requirement of high power engine technology.(3)Through the connecting rod forging metal streamline to carry out the test,the fatigue life test,cutting performance experiments showed that satisfied the tin LG40CrS connecting rod steel wood,etc.The technical requirements for the domestic each big engine makers.(4)Development of LG40CrS connecting rod with steel,further established the brand image of shandong steel co,LTD,the special steel business unit of laiwu branch,and increased the competitiveness of enterprise products market.