Analysis and solution to rotary error of motorized spindle of high-precision tool grinder
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摘要: 针对某国产品牌电主轴在实际应用中易出现回转精度超差的问题,分析造成电主轴产生精度超差的主要原因是电主轴的气密封效果不佳,使得前端轴承及碟形弹簧进油受污染,从而导致电主轴前端轴承失效、轴芯磨损和拉刀力衰减过快。通过提升气密封压力值和改善轴芯材质及拉刀机构,解决了电主轴内部进油、轴芯磨损和拉刀力衰减过快的问题,使电主轴使用寿命提升1倍以上。Abstract: This paper aims to solve the problem of abnormal rotation error that occurred in a domestic brand motorized spindle. The abnormal rotation error of the motorized spindle is caused by the gas seal failing to play a good sealing effect, which causes the front bearing and disc spring polluted by grinding oil, thus resulting in the failure of the front bearing, the worn of the spindle shaft and the decay of broaching force. By improving gas seal pressure, the material of the spindle shaft, and the structure of the broach, the service life of a motoried spindle is increased by more than 100%.
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表 1 电主轴参数及精度要求
功率
P/kW锥口规格 主轴斜度内孔
跳动B/mm测试棒60 mm处
跳动B/mm测试棒140 mm处
跳动B/mm14.5 HSKE50 0.002 0.003 0.005 拉刀力
F/kN最高转速
n/(r/min)轴承润滑方式 安装方式 主轴冷却方式 10.5 10 000 油脂润滑 卧式 水冷却 表 2 40Cr化学成分与ICP检测结果比对
检测元素 C Mn Cr Ni Mo 化学成分 0.37~0.44 0.50~0.80 0.80~1.10 ≤0.30 ≤0.10 ICP检测 0.37 0.53 0.90 0.02 0.10 -
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