基于“S”件的五轴数控机床加工精度综合评价系统研究

发布时间：2018-05-08 16:29

  本文选题：五轴数控机床 + 加工精度　； 参考：《电子科技大学》2015年硕士论文

【摘要】：五轴数控机床在航空薄壁件加工中有着不可替代的作用,针对数控机床加工精度的检测,一般用试切标准件的方法。目前广泛应用的标准件有美国国家航天局提出的NAS979试件、德国的NCG2004试件等,但它们在五轴数控机床加工精度检验上还存在一些问题。成都飞机工业(集团)有限责任公司提出了一种适用于五轴数控机床精度检验的标准试件——“S”形检验试件,现已得到广泛认可。本文以“S”形检验试件为研究对象,研究“S”形检验试件的表面轮廓误差与机床参数之间的映射关系,提取出评价指标并建立五轴数控机床加工精度综合评价模型,并根据此模型开发出一套机床加工精度测评系统。主要内容有:1、利用仿真平台进行单因素仿真,确定了实际加工中对机床加工精度影响较大的机床参数在“S”形检验试件表面的误差敏感区域,在敏感区域提取综合评价指标并根据隶属关系建立分层的评价指标体系。2、根据评价指标体系的特点,选用序关系分析法求取指标体系各层的指标权重,利用隶属度函数对指标实际值进行模糊化,并选取合适的模糊算子进行模糊合成,最终建立基于“S”形检验试件的五轴数控机床加工精度综合评价模型,使用Matlab软件编写综合评价算法。3、以五轴数控机床加工精度综合评价模型为基础,利用C#、Matlab混合编程技术开发基于“S”形检验试件的五轴数控机床加工精度综合评价系统的客户端,利用ASP.NET语言编写评价系统的网页端并以SQL Server为系统数据库。该系统利用“S”形检验试件的三坐标测量机测得的表面轮廓数据,通过综合评价的方法实现对机床加工精度的评估,能够分析并提取对机床加工精度影响最大的因素,为五轴数控机床的调整维护提供依据。
[Abstract]:Five-axis numerical control machine tool has irreplaceable role in the machining of thin wall parts of aviation. For the inspection of machining accuracy of numerical control machine tool, the method of trial-cutting standard parts is generally used. At present, the widely used standard parts are NAS979 specimen proposed by NASA, NCG2004 specimen of Germany and so on. However, there are still some problems in the machining accuracy test of five-axis NC machine tool. Chengdu aircraft Industry (Group) Co., Ltd. has proposed a standard specimen, "S" shape test piece, which is suitable for the precision test of 5-axis CNC machine tools, which has been widely accepted. In this paper, taking the "S" shape test specimen as the research object, the mapping relationship between the surface contour error of the "S" shape test specimen and the machine tool parameters is studied, the evaluation index is extracted and the comprehensive evaluation model of the machining accuracy of the five-axis NC machine tool is established. According to this model, a machine tool machining accuracy evaluation system is developed. The main contents are: 1. Using the simulation platform for single factor simulation, the error sensitive area of the machine tool parameters which have a great influence on the machining accuracy in the "S" shape inspection specimen surface has been determined. The comprehensive evaluation index was extracted from sensitive area and the hierarchical evaluation index system was established according to the subordinate relationship. According to the characteristics of the evaluation index system, the index weight of each layer of the index system was obtained by using the method of order relation analysis. The actual value of the index is fuzzed by membership function, and the appropriate fuzzy operator is selected for fuzzy synthesis. Finally, a comprehensive evaluation model of machining accuracy of five-axis NC machine tool based on "S" shape test specimen is established. The comprehensive evaluation algorithm. 3 is compiled by Matlab software, based on the comprehensive evaluation model of machining accuracy of five axis NC machine tools. The client of 5-axis NC machine tool machining accuracy comprehensive evaluation system based on "S" shape test sample is developed by using the mixed programming technology of C#C and Matlab. The web page of the evaluation system is compiled with ASP.NET language and the database of the system is SQL Server. The system uses the "S" shape to test the surface contour data of the specimen measured by the CMM, and evaluates the machining accuracy of the machine tool by the method of comprehensive evaluation. The system can analyze and extract the factors that have the greatest influence on the machining accuracy of the machine tool. It provides basis for adjustment and maintenance of five-axis NC machine tool.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TG659
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本文编号：1862126