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| Angle deviation control using geometric tolerance and angle tolerance analysis |
| XU Xu-song1,2, WU De-hui3 |
1. College of Mechanical Engineering, Jiangsu University of Technology, Changzhou 213001, China;
2. Key Laboratory of Advanced Manufacturing Technology of Zhejiang Province, School of Mechanical Engineering, Zhejiang University, Hangzhou 310027, China;
3. BOSCH Power Tools(China) Co., Ltd., Hangzhou 310052, China |
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Abstract Aiming at the problems that angle size tolerance cannot control the angle deviation between two planes and the angle deviation may be out of control when using geometrical tolerance, the tangent feature symbol for toleranced feature was introduced. When the geometric tolerance was used to control the angle deviation between the toleranced surface and the datum, the tangent feature symbol would be added to the toleranced feature. The conversion method between geometric tolerance and angle tolerance was given. Aiming at the problem of the accumulation calculation of angle deviation between two planes in assembly layer, the illustration of angle dimension chain and the accumulation calculation method of angle dimension chain deviation were studied for the parts which had been assembled. Finally, taking the electric wood cutting machine as an example, the angle accumulation deviation of the relative features of each part was controlled by geometric tolerance to meet the design requirement. The conversion of geometric tolerances to angular tolerance of each feature was realized. The angle accumulation deviation calculation using angle dimension chain was analyzed. The example can be used as a reference for geometric tolerance analysis control between planes and pattern annotation.
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Received: 18 September 2017
Published: 28 June 2018
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几何公差控制角度偏差及角度公差分析
针对角度尺寸公差不能控制平面与平面之间的角度，而采用几何公差控制可能会导致角度偏差失去控制等问题，引入了被测要素附加贴切要素符号，实现用几何公差精准控制被测平面与基准面之间角度偏差，并给出了几何公差与角度公差的换算方法；针对装配层平面与平面之间角度偏差控制及累积计算问题，研究了多个零件装配后的角度尺寸链画法和角度尺寸链偏差累积计算方法；最后，以某型号电动木材切割机为例实现了用几何公差控制角度累积偏差以及各个零件上相关特征的几何公差与角度公差的转换，并分析计算了角度累积偏差。研究结果可为平面与平面之间的角度公差的分析控制及图样标注提供借鉴和参考。
关键词：
角度偏差,
贴切要素符号,
公差分析,
偏差累积,
木材切割机
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