In view of formation,heat transferring,heating generation and dynamic recrystallization,a macro-micro coupled process was modeled,and the positive and negative extrusion for universal joint fork was simulated.

The query and improvement of tripod type universal coupling;

This paper covers the set up of the space coordinate axis of the ring fork U joint, and through the analysis of the additional moment in the ring fork U joint it presents how the value of the additional moment is obtained.