Ball Mill Main Shaft

This article elaborates on the ball mill shaft, a core component that transmits torque, bears heavy loads (up to thousands of tons), and connects the cylinder and transmission system, with 45# steel and 42CrMo alloy steel as common materials for different sizes. It details the manufacturing process of 42CrMo shafts, including raw material pretreatment, forging, heat treatment (normalizing and quenching-tempering), rough machining, semi-finishing, precision grinding, and assembly. Additionally, it outlines comprehensive inspection procedures covering raw materials (chemical composition, mechanical properties), heat treatment (hardness, metallographic structure), machining accuracy (dimensional and geometric tolerances), and final product tests (surface quality, dynamic balance, hydrostatic test). These ensure the shaft meets strength, toughness, and precision requirements, supporting stable and efficient operation of ball mills.