车削大螺距螺纹工艺可靠性评判方法
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摘要
大螺距螺杆左右螺纹面加工误差沿轴向的分布对压力机滑块的定位与重复定位精度有重要影响,车削螺纹工艺应具有高可靠性。已有的利用误差最大值评判加工精度的方法,忽略了加工误差沿轴向的分布特性,无法揭示工艺的可靠性。为此,采用相同工艺方案,进行两次车削螺距16mm外螺纹试验,构建中径误差和左右螺纹面的大小径、牙型半角、螺距误差分布行为序列,采用灰色关联分析方法,利用加工误差分布行为序列的相似性评判大螺距外螺纹工艺可靠性,并进行实验验证。结果表明,采用该方法可有效识别和评判车削大螺距螺纹工艺可靠性。
There is a great influence of machining error distribution of large pitch screw's left and right thread surface along the axial direction on positioning and repeat positioning accuracy of press slide. Thread cutting process should have high reliability. The method through judging the machining accuracy by maximum error ignores the distribution characteristics of the machining error along the axial direction and cannot reveal the reliability of the process. For all this, there are two tests of turning external thread with pitch 16 mm conducted in the same process. Through the experiments, distributions of big diameter error, small diameter error,half of thread angle error,pitch and pitch diameter error of left and right thread surfaces are structured. The process reliability can be judged by the similarity between the machining error sequences through the grey correlation analysis method. Then verification of process reliability evaluation method is verified by experiment. Finally, the results show that the method is applicable to recognize and evaluate the stability, repeatability of thread surface machining error and consistence of left and right thread surface machining error.
There is a great influence of machining error distribution of large pitch screw's left and right thread surface along the axial direction on positioning and repeat positioning accuracy of press slide. Thread cutting process should have high reliability. The method through judging the machining accuracy by maximum error ignores the distribution characteristics of the machining error along the axial direction and cannot reveal the reliability of the process. For all this, there are two tests of turning external thread with pitch 16 mm conducted in the same process. Through the experiments, distributions of big diameter error, small diameter error,half of thread angle error,pitch and pitch diameter error of left and right thread surfaces are structured. The process reliability can be judged by the similarity between the machining error sequences through the grey correlation analysis method. Then verification of process reliability evaluation method is verified by experiment. Finally, the results show that the method is applicable to recognize and evaluate the stability, repeatability of thread surface machining error and consistence of left and right thread surface machining error.
引文
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[2] 卢蔚民,孙友松,卢怀亮. 重型摩擦压力机的再制造方案[J]. 锻压技术, 2013,05 : 132.
[3] LI K,JIANG L,CHEN M. Experimental study on the influence of cutting parameters on thread precision of external thread turning[J]. Materials Science Forum,2014,770 : 7.
[4] PIERRE S,FLORESTAN M,JEAN G. Experimental study of forming and tightening processes with thread forming screws[J]. Journal of Materials Processing Tech,2011,2124.
[5] 张义民.机械可靠性设计的内涵与递进[J]. 机械工程学报,2010,14 : 167.
[6] 张义民,孙志礼. 机械产品的可靠性大纲[J]. 机械工程学报,2014,14 : 14.
[7] 胡占齐,解亚飞,刘金超. 超重型数控镗铣床精度可靠性研究[J]. 哈尔滨工程大学学报,2011,32(12) : 1599.
[8] 邓超,吴军,毛宽民,等. 面向大型数控机床的工艺可靠性评估[J].计算机集成制造系统, 2010,10 : 2250.
[9] 张根保,葛红玉,刘佳,等. 可靠性驱动的装配过程建模及预测方法[J]. 计算机集成制造系统,2012,02 : 349.
[10] 匡芬,戴伟,王健,等. 基于质量特性演化的工艺可靠性评估[J]. 计算机集成制造系统,2015,08 : 2124.
[11] 付桂翠,上官云,史兴宽,等.基于产品可靠性的工艺系统可靠性模型[J].北京航空航天大学学报,2009,01:9.
[12] 刘勇,刘思峰,JEFFREY F. 一种新的灰色绝对关联度模型及其应用[J]. 中国管理科学,2012,20(5):173.