The core advantage of using forgings instead of castings for universal joint yokes

The core advantage of using forgings instead of castings for universal joint yokes lies in their denser internal structure and mechanical properties, which can better adapt to the complex stress conditions when the universal joint transmits torque.

1. Stronger Mechanical Properties

Forging refines metal grains through plastic deformation and aligns the grain flow with the direction of stress. As a result, forgings have much higher tensile strength, yield strength, and impact toughness than castings, and are less prone to fracture under alternating loads.

2. Fewer Internal Defects

Castings are susceptible to defects such as blowholes, shrinkage cavities, and sand inclusions, while forging can eliminate problems like looseness and porosity in raw metal materials, improving the structural integrity and reliability of the yoke.

3. Better Fatigue Resistance

During operation, universal joints undergo repeated angular swings and torque impacts. The uniform structure of forgings gives them significantly longer fatigue life than castings, thereby extending the overall service life of the universal joint.

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