Transactions of Materials and Heat Treatment

Title：Fuzzy comprehensive evaluation of precision for bottom dead center based on the variable weight method

Authors： Wu Xuze Cao Chunping Sun Yu

Unit： Nanjing University of Science and Technology

KeyWords： mechanical press bottom dead center dynamic precision fuzzy evaluation AHP variable weight method

ClassificationCode：TG385.1

year,vol(issue):pagenumber：2018,43(6):156-161

Abstract：

The dynamic precision of bottom dead center (BDC) is an important indicator to evaluate the performance of mechanical press. In order to comprehensively evaluate the BDC precision of press, variable weight method was introduced, and a fuzzy comprehensive evaluation system based on Analytic Hierarchy Process (AHP) was proposed. Taking the repeat accuracy, drift offset and mean square error of displacement of slider BDC as the evaluation index, the possible reversal issues was solved by geometricweighted AHP, and the degree of membership was determined by trapezoidal distribution function. In the meanwhile, each index weight was adjusted by the variable weight method to solve the problem that the evaluation result was not sensitive to the index with low scores due to the fixed weights of classical AHP. In the end, for a certain type of highspeed press, the precision of BDC was evaluated. The result shows that this method can highlight the index with low scores, and the change rate of its weight can up to 76.61% after applying variable weight method. Thus, the rationality of evaluation is enhanced.

Funds：

江苏省重点研发计划（BE20150113）

吴旭泽（1995-），男，学士；Email：1198987082@qq.com；通讯作者：曹春平（1976-），女，博士，副教授；Email：ccp_alice@163.com

Reference：

［1］邓明，胡根铭，吕琳，等. 精冲压力机的现状及发展趋势
［J］.锻压技术，2016，41(8):1-6.

Deng M, Hu G M, Lyu L，et al. Present situation and development trend of fine blanking press
［J］. Forging & Stamping Technology, 2016, 41(8):1-6.

［2］鹿新建，柯尊芒，朱思洪，等.高速精密压力机下死点精度研究
［J］.锻压技术，2010，35(1):87-92.

Lu X J, Ke Z M, Zhu S H, et al. Research on bottom dead center (BDC) of high speed precision press
［J］. Forging & Stamping Technology, 2010, 35(1):87-92.

［3］管培鹏，赵宇，吴洪涛.高速压力机传动系统对下死点精度影响的研究
［J］.锻压装备与制造技术，2011，46(6):79-83.

Guan P P, Zhao Y, Wu H T. Study on influence of transmission system on accuracy of bottom dead center(BDC)
［J］. Forging Equipment & Manufacturing Technology,2011,46(6):79-83.

［4］胡峰峰，王尚斌，孙宇，等.运动副间隙对多连杆压力机下死点精度的影响
［J］.机械科学与技术，2014，33(9):1304-1308.

Hu F F, Wang S B, Sun Y, et al. Effect of the joints clearance on the precision of bottom dead center for multirod mechanical press
［J］. Mechanical Science and Technology for Aerospace Engineering, 2014, 33(9):1304-1308.

［5］王晓东，鹿新建，肖政，等.高速压力机下死点测试及数据分析
［J］.锻压装备与制造技术，2008，43(2):37-39.

Wang X D, Lu X J, Xiao Z, et al. The bottom dead point test and data analysis of highspeed press
［J］. Forging Equipment & Manufacturing Technology, 2008, 43(2):37-39.

［6］宋恭杰，潘晓彬.基于模糊层次分析法的冲床下死点定位精度评价
［J］.锻压技术，2014，39(6):85-89.

Song G J, Pan X B. Evaluation of bottom dead center positioning precision for mechanical press based on fuzzy analytic hierarchy process
［J］. Forging & Stamping Technology, 2014, 39(6):85-89.

［7］朱克毓.模糊AHP的无效性与基于几何加权的AHP方法研究
［D］.合肥：合肥工业大学，2012.

Zhu K Y. The Study on the Invalidity of Fuzzy AHP and a Weighted Geometric Method of AHP
［D］. Hefei: Hefei University of Technology, 2012.

［8］Saaty T L. Analytic Hierarchy Process
［M］. Hoboken:Encyclopedia of Biostatistics, 2013.

［9］张吉军.模糊层次分析法(FAHP)
［J］.模糊系统与数学，2000，14(2):80-88.

Zhang J J. Fuzzy analytical hierarchy process
［J］. Fuzzy Systems and Mathematics, 2000, 14(2):80-88.

［9］彭祖赠，孙韫玉.模糊(Fuzzy)数学及其应用
［M］.2版.武汉：武汉大学出版社，2007.

Peng Z Z, Sun Y Y. Fuzzy Mathematics and Its Application
［M］. 2nd Edition. Wuhan: Wuhan University Press, 2007.

［11］Wei C C, Chien C F, Wang M J J. An AHPbased approach to ERP system selection
［J］. International Journal of Production Economics, 2005, 96(1):47-62.

［12］李德清，李洪兴.变权决策中变权效果分析与状态变权向量的确定
［J］.控制与决策， 2004，19(11):1241-1245.

Li D Q, Li H X. Analysis of variable weights effect and selection of appropriate state variable weights vector in decision making
［J］. Control and Decision, 2004, 19(11):1241-1245.

［13］封志明，殷国富.基于层次分析法的数控机床精度模糊评价
［J］.高技术通讯，2014，24(2):183-188.

Feng Z M, Yin G F. Fuzzy comprehensive evaluation of the accuracy of CNC machine tools Based on AHP
［J］. Chinese High Technology Letters, 2014, 24(2):183-188.

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