Recently, Shenyang Sanland Mining Engineering Co., Ltd. completed the shrink-fit assembly of cone bodies and main shafts for a batch of cone crushers. Each cone body is heated and expanded, fitted onto the main shaft, and locks tightly around it as it cools back to room temperature, forming an interference fit for subsequent assembly.

The cone body and main shaft are the core components transmitting crushing force, and they are joined by interference fit. At room temperature the bore cannot be fitted over the shaft, so a shrink-fit process is used: the cone body is heated so the bore expands, slid onto the shaft at the fitted position, and as the temperature returns to ambient, the bore contracts and grips the shaft tightly. No keys or bolts are involved, giving a large, evenly loaded joint.

Shrink fitting demands strict process control. Before assembly, the bore and shaft are measured to determine heating temperature and time from the expansion coefficient. A ring heater warms the cone body evenly at a controlled rate to avoid localized overheating. At the set temperature the body is lifted, aligned and fitted in one motion. After cooling, position and tightness are rechecked to confirm the joint.

The advantage of a shrink-fit joint is rigidity and reliability. Without keyways or threads to concentrate stress, the joint carries load as a whole and stays tight under long, heavy duty. The fits are finish machined and measured part by part, keeping assembly quality consistent and the cone assembly stable once liners are fitted and the crusher goes into operation.

With this shrink-fit process completed, Sanland continues to demonstrate its capability in assembling core components of cone crushers. Shenyang Sanland remains committed to providing reliable equipment and spare parts to mining and aggregate customers worldwide.

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