Select top suppliers, sampling and festing of their raw materials in random to make sure thatrawmaterial meets national standards and mechanical properties meet product designrequirements.Descaling rough turning: according to the size of finished products, reserve enough sizemarginsUltrasound flaw detection: the forgings after rough turning are detected by ultrasoundwhether thereare any defects in the material: such as blowhole, slag inclusion, lamination and soon.Tempering treatment according to the national standard or the special reauirements ocustomers, thetempering treatment could improve the mechanical properties.According to the type and size of the raceway structure, a suficient margin is reserved to ensurethatthe machine deformation and quenching defommation can be eliminated, and try toremaining amountis required to be as small as possible.Flat Steel For Chain The raceway is quenched by medium frequency quenching process. The hardness ofquenchingarea reaches HRC55-62. Spring Steel Strip and the effective depth is notless than 3 mm. Afterguenching, the racewayis fempered stably to eliminate quenching stress, reduce subseauenprocessing deformation andreduce the risk of raceway cracking.Detection of hardness, effective depth and crack in quenched area, especially initial position.According to different kinds of tooth shape, processing methods such as shaping,Alloy Steel Coil hobbingandmiling can be selected. The accuracy level can meet 7-10 grades.lf higher accuracy isneededgrinding can meet 4-6 grades.In order to meet the strength and service life of the teeth, high frequency quenching is carried outonthe tooth surface. root and top according to diferent requirements. The hardness canmeetHRC40-55 and the depth can meet 1.5mm. High carbon steel stripTempering stabilization after quenching , theauenchingstress can be eliminated, the cracking risk of the quenched part can be reduced, ancthe hardnessand crack detection can be carried out after quenching
