铜基粉末冶金双锥同步器同步环的加工及优化

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

以-200目电解铜粉和雾化细黄铜粉为原料,利用喷撒烧结设备、拉伸成锥设备及模具,研究了铜基粉末冶金双锥同步器同步环的撒粉烧结和拉伸成锥工艺。结果表明,铜基粉末冶金摩擦材料的孔隙率保持在30%左右,且孔隙呈细微和均匀分布;摩擦材料层的平均动摩擦系数为0.081,静摩擦系数为0.146,磨耗率为8.70×10-9 cm3/J;该材料在随钢芯板冷拉伸成锥形时不掉渣,厚薄均匀,锥度、圆度及尺寸变化很小,其原料配方和拉伸成锥工艺可适用与大批量生产。

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.