基于不同隶属度函数的金属材料切削加工性模糊综合评价
2019-04-23
作者：李香飞
单位：天津职业技术师范大学
摘要：随着各种高性能工程材料的不断出现，为快速准确地制定这些材料的加工工艺，需要可靠地评估其切削加工性。目前常用且合理的评价方法是模糊综合评价法，确定最佳隶属度函数是其关键。本文分别构建正态型和分段型隶属度函数模型，对8种金属材料的可加工性进行模糊综合评价。结果表明：正态型隶属度函数所含参数较多且计算较复杂，但模糊综合评价结果优于基于分段型隶属度函数的结果；分段型隶属度函数形式简单，所含参数较少且计算较为快捷；当评价因素远离非模糊子集边缘区域时，评价结果与基于正态型隶属度函数的模糊综合评价结果一致。
关键词：可加工性评价；正态型隶属度函数；分段型隶属度函数；模糊综合评价
中图分类号：TG501；TH162文献标志码：ADOI：10.3969/j.issn.1000-7008.2019.04.016
Fuzzy Comprehensive Evaluation of Machinability for Metal Materials Based on
Different Membership Functions
Li Xiangfei
Abstract:With the continuous emergence of highperformance engineering materials，the machinability of materials need to be reliably evaluated in order to obtain rapidly and accurately the processing technologies of these materials.The fuzzy comprehensive evaluation method is recognized as the most common and reasonable approach to this end. In the process of fuzzy evaluation of material processability based on fuzzy theory，it is the key to determine the optimal membership function.The normal membership function and the piecewise membership function model are constructed to evaluate the machinability of eight metal materials using fuzzy comprehensive evaluation.The results show that there are a number of parameters in the membership function of normal form that leads to the complexity of calculation process.However，the result of fuzzy comprehensive evaluation based on the normal membership function is better than that based on piecewise membership function.The piecewise membership function has fewer parameters and is simple in its form that results in the simplicity of computational process.The fuzzy comprehensive evaluation results from these two approaches are consistent when the values of the evaluation factor are far away from the marginal region of nonfuzzy subset.
Keywords:machinability evaluation；normal membership function；piecewise membership function；fuzzy comprehensive evaluation