考虑加工过程的复杂薄壁件加工综合误差补偿方法
收稿日期: 2013-11-27
修回日期: 2014-03-14
网络出版日期: 2014-03-20
基金资助
国家"973"计划 (2013CB35802)
A Comprehensive Error Compensation Approach Considering Machining Process for Complex Thin-wall Parts Machining
Received date: 2013-11-27
Revised date: 2014-03-14
Online published: 2014-03-20
Supported by
National Basic Research Program of China (2013CB35802)
在统计分析的理论基础上,首先将数控加工过程视作以参考模型为自变量,以加工结果为因变量的过程函数;然后将整个误差补偿过程分为3个典型的加工状态,分别构造各个状态的过程函数,并以材料去除量系数为桥梁,建立复杂薄壁件加工综合误差补偿数学模型;对数学模型进行泰勒展开,计算复杂薄壁件加工过程中的误差补偿量,重新构造误差补偿几何模型并生成新的加工程序,以减小复杂薄壁件的加工误差,提高加工质量.通过一组叶片加工对比试验,按照名义去除量进行加工的最大加工误差是0.094 mm,而按照误差补偿量进行加工的最大加工误差是0.031 mm,仅是前者的32.9%,说明了本文方法在提高加工精度方面的有效性.
杨建华 , 张定华 , 吴宝海 . 考虑加工过程的复杂薄壁件加工综合误差补偿方法[J]. 航空学报, 2014 , 35(11) : 3174 -3181 . DOI: 10.7527/S1000-6893.2014.0019
Based on statistical analysis, the paper viewed the process of NC machining as a mathematical function with the reference model as an independent variable and the machining result as the dependent variable. Then the whole error compensation process is divided into three typical states whose process functions are built separately. With the help of the removal amount coefficient, the mathematical model of comprehensive error compensation is constructed. And the model is resolved by Taylor expansion to calculate the error compensation amount which is used to reconstruct the geometric model of the part and regenerate a new NC program. The approach is verified with a milling experiment of thin-wall blades. The maximum error was 0.031 mm after machining at the error compensation machining amount, which is 32.9% of the maximum error of 0.094 mm after machining at the normal machining amount. The result shows that the approach is efficient in improving machining quality.
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