Case Study: Sliding Sleeve

Process: Conventional Press & Sinter (PM)

Material: FL-4405-175HT Prealloyed Steel, Induction Hardened

Density: 7.3 g/cm³

Torque: 1,500 Nm

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End Use and Function

This groundbreaking sliding sleeve is utilized in a synchronizer for a dedicated hybrid transmission.

Fabrication

Manufactured with FL-4405-175HT prealloyed steel, the parts are produced net-shape, except for the external fork groove. The back tapers and ball pockets in the internal spline are radially pressed using a patented surface densification process, ensuring full density in the critical areas of the part, including the teeth roof. After induction hardening, the sleeves can transmit up to 1,500 Nm torque.

Results

This part is produced in a fully automated one piece flow line including heat treatment, obtaining a net-shape inner geometry and extraordinary mechanical properties, replacing a wrought steel part thanks to full density on critical functional areas achieved with a patented surface densification process. After rigorous bench testing, the components were validated in the transmission by the customer, showcasing the advantages of the metal powder technology in automotive applications.