软质齿轮齿距累积偏差影像法测量

Projection Method Measurement on Non-rigidity Gear Pitch CumuIative Errors

采用影像法对微小齿轮或软质齿轮齿距累积偏差，进行非接触测量，利用影像测量仪和回转工作台，采用单齿法和跨齿补点法，通过对回转工作台角度转位的分度误差补偿完成测量，提高了绝对法测量数据的合理性。对齿轮安装偏心误差、测量仪器误差和瞄准对齐误差分析，得到单齿法和跨齿补点法齿距累积偏差测量的不确定度分别为＆#177;65μm和＆#177;64μm，均满足测量精度要求。两种方法对被测塑料软质齿轮精度等级判定都为10级。相比来说，跨齿补点法测量次数更少，过程更简化。

To resolve the problem of micro gear or non-rigidity gear position alteration errors, a non-contact projection measurement method is adopted. Appling projection measurement appliance and rotary table by single pitch method and span pitch add-on spot method, through compensation of division errors of rotary table, gear pitch cumulative errors measurement is finished which is proved reasonable by absolute method measurement. Through analysis of the install gear eccentric errors, instrument measuring errors and aiming alignment errors, the gear pitch cumulative errors uncertainty is got about ＋65p^m by single pitch method and ＋ 641xm by span pitch add-on spot method which all meet the demand of measurement precision. Finally, a conclusion is made that the tested non-rigidity plastic gear precision level is confirmed as 10 level by both measuring methods. By comparison, span pitch add-on spot method has more advantage in less measuring times and easy control in gear pitch cumulative errors measurement.