The structure of the sprocket is roughly as follows: 1. Overall structure.It is generally used in the processing of single, double row, single and double flange sprockets with standard chain P=38.1 or less. 2. Welded structure.Mainly used in the processing of medium and large size single and double flange sprockets.During processing, the flange part is formed into a convex shape by a bar car.The ring gear part can be machined with the outer diameter and the shaft hole after cutting the plate.When welding, both ends should be welded, and low-hydrogen electrodes such as T506 electrodes should be used. 3.Cast sprockets.It is mainly used in the processing of large sprockets. During processing, only the ring gear, the two ends of the flange, the outer and inner diameters and the keyway are processed, and then the tooth shape is processed.The ring sprockets are all cast.There are generally two materials for cast sprockets, cast iron and cast steel such as HTl5O, HT2O0 and ZG310-570 (ZG45). 4. Forged sprockets.It is mainly used in the production of medium and large size sprockets with large force.When forging, whether it is a single-flange type or a double-flange type, it is generally forged into a convex shape, leaving enough machining allowance for the shaft hole, the material utilization rate is low, and the cost is high.