4105 内燃机主轴用翻边轴瓦要承受较重的径向载荷和轴向载荷,需要良好的减摩耐磨性能.该翻边轴瓦采用AlSn20Cu/08A1 双金属板制成,其成型工艺对质量有很大影响.首先在压力机上将板材冲压成 U 形,上下冲压模具材料分别为Cr12、45.然后用三辊式专用滚圆机加工成半圆形轴瓦,上滚轮材料选用 9Cr2Mo,下滚轮材料为 40Cr,后顶轮材料为Cr12.最后采用专用工装在压力机上对轴瓦进行整形,提高轴瓦的贴合度.该成型工艺简单,对设备要求低,完成后的翻边轴瓦尺寸稳定,贴合度高,得到了广泛应用.
Study on Forming Technology of Flanged Bearing for Main Shaft of 4105 Combustion Engine
The flanged bearing for main shaft of 4105 combustion engine would bear heavy radial and axial loads,so it need good friction reduction and wear resistance.The flanged bearing is made of AlSn20Cu/08A1 bimetallic plates.Its forming process has a significant impact on quality.Firstly,the bimetallic plate is stamped into a U-shape on a press.The materials of the upper and lower stamping molds are Cr12 and 45 respectively.Then,using a three-roller specialized rounding machine the U-shape is processed into a semicircle.The material of upper roller is 9Cr2Mo.The material of lower roller is 40Cr.The material of rear holding roller is Cr12.Finally,the special tooling is used to reshape the bearing on the press machine,to improve the fit of bearing shells.The forming process is widely applied,because it is simple and requires low to equipment.And the flanged bearing has stable size and high fit.
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