Sprocket Improvement Measures

The service life of the sprocket is short, which is far from meeting the requirements of production practice. According to the use of the sprocket, processing status, and manufacturing technology, some improvement measures are proposed for the sprocket:

(1) The original sprocket design material is 40Cr, the overall quenched and tempered hardness is HB220~250, and the teeth are quenched HRC48~52. This method basically cannot improve the wear resistance of the sprocket due to the limited quenching hardness of the teeth. It is recommended to change the sprocket material to 20CrMnTi, carburizing and quenching, the hardness of the chain nest can reach above HRC60, and its wear resistance is more than 2.5 times that of 40Cr material. This can greatly improve the service life of the sprocket, reduce the frequency of machine repairs, improve productivity and reduce production costs;

(2) The shape of the original sprocket chain socket is directly formed by forging, which has large dimensional error, rough surface and reduced wear resistance. With the wide application of CNC machine tools and the reduction of their processing costs, it is recommended to leave a small margin after forging, and finish finishing by numerical milling to improve dimensional accuracy and surface roughness, so as to achieve the purpose of improving wear resistance.