Cost Effective Manufacture of Synchronizer Hubs and Rings for Manual Transmissions by Sinterhardening 2000-01-0998
Sinterhardening has proven to be an efficient and cost saving way to manufacture high strength components f.e. for gear boxes in an environmetally friendly manner.
Material investigations showed that diffusion alloyed materials generally proved to be less sensitive to the hardening conditions and geometry than prealloyed materials either regarding hardness or dimensional change.
As sizing of components is difficult to impossible in the sinterhardened condition, shrinkage or swelling has a decisive effect on the final dimensional stability.
Compared to casehardening sinterhardening requires a significantly higher alloy content of f.e. Ni or Mo. Despite this particular cost disadvantage, the overall process provides lower costs at similiar strength levels and better tolerances.