Processing and optimization of copper-based powder metallurgy synchronizing ring for double cone synchronizer

The copper-based powder metallurgy synchronizing ring for double cone synchronizer was prepared by using-200 mesh electrolytic copper powder and atomized fine brass powder as raw material, the processes of dusting powder, sintering, and stretching of copper based powder metallurgy synchronous ring were investigated by spraying sintering equipment, stretching equipment, and cone mould. The results show that, the porosity of copper based powder metallurgy friction material is maintained at about 30%, the fine pores are in uniform distribution. The average friction coefficient of friction material layer is 0.081, the static friction coefficient is 0.146, and the wear rate is 8.70 × 10^-9 cm³/J. The copper based powder metallurgy friction material is tapered without dregs in cold drawing with steel core plate, the thickness is uniform, and the taper, roundness, and dimensions are steady. The composition of raw material and the stretching technology are suitable for the mass production.