嵌入式多功能磨加工主动量仪控制器关键技术研究

发布时间：2018-05-12 07:28

本文选题：主动测量 + 灰色系统　；参考：《郑州大学》2017年硕士论文

【摘要】：磨加工是保证机加工精度的重要工序,磨削质量的高低直接决定着工件的性能。主动测量技术可以在机加工过程中实时监测工件的尺寸信息并对加工进程实施反馈控制,可提高加工精度和降低生产成本。目前,我国在主动测量领域与国外存在着较大的技术差距,控制器还大多停留在微机化水平,功能十分单一、测量精度不高。随着电子技术的进步,微处理器和嵌入式操作系统为高性能主动测量仪控制器的研制提供了软硬件基础。本文在研究主动测量控制器功能需求的基础上,开发了以A8微处理器、嵌入式WinCE系统为平台的多功能主动测量控制器,深入研究了其工艺参数设定、断续表面测量和在线圆度评定等相关功能的关键技术,完成的主要工作有:(1)论文在分析多功能磨加工主动测量控制器的功能需求基础上,完成了以A8微处理器、嵌入式WinCE系统为平台的多功能主动测量控制器的软、硬件总体方案分析与设计;并根据软件系统对数据实时性响应的高速数据操作需求,给出了软件系统的数据管理策略及方案设计。(2)论文运用灰色系统理论,分析不同工艺参数对加工质量评价指标的影响;并结合数据库历史加工数据,通过加权灰靶决策分析得出数据库中历史最优工艺参数组合,进而实现控制器工艺参数的自主设定。(3)分析实际工况下的断续表面测量采样值变化情况的形成原因,结合相邻采样点值在键槽内的变化情况,提出设定内部同期模式中触发周期的方法。(4)论文在考虑磨削加工过程中砂轮进给对工件轮廓成形的影响,提出对加工过程中尺寸补偿的在线圆度评定方法。同时,对比分析了在线圆度评定与机后圆度评定两种理论方法的联系与区别。(5)在实验室现有硬件平台和软件支持的条件下,利用主要由半自动高精密数控磨床、所开发的开发基于A8微处理器的多功能主动测量控制器样机、传感器、粗糙度仪和圆度仪等组成的实验系统,对上述关键技术分别做了试验分析或实验验证,结果证明了技术原理的合理性和可行性。论文对多功能磨加工主动量仪控制器关键技术的研究为现有系列控制器的升级换代提供了技术理论支持,对于提升主动量仪控制器智能化水平、拓展应用范围具有重要意义。
[Abstract]:Grinding is an important process to ensure machining accuracy. The quality of grinding directly determines the performance of workpieces. The active measurement technology can monitor the dimension information of the workpiece in real time and control the machining process in real time. It can improve the machining precision and reduce the production cost. At present, there is a big technical gap between our country and foreign countries in the field of active measurement. Most of the controllers remain at the level of microcomputer, the function is very single, and the measurement accuracy is not high. With the development of electronic technology, the microprocessor and embedded operating system provide the hardware and software foundation for the development of the controller of high performance active measuring instrument. Based on the research of the functional requirements of the active measurement controller, a multi-function active measurement controller based on A8 microprocessor and embedded WinCE system is developed in this paper. On the basis of analyzing the functional requirements of the active measuring controller for multifunctional grinding processing, the A8 microprocessor has been completed, and the main work of this paper is the following: (1) on the basis of the analysis of the functional requirements of the active measuring controller for multifunctional grinding and machining, the main work accomplished in this paper is A8 microprocessor. The software and hardware of the multi-function active measurement controller based on embedded WinCE system are analyzed and designed, and according to the high speed data operation demand of the software system, the real-time response of the software system to the data is analyzed and designed. In this paper, the data management strategy and scheme design of the software system are given. (2) using the grey system theory, the paper analyzes the influence of different process parameters on the evaluation index of machining quality, and combines with the historical processing data of database. Through the weighted grey target decision analysis, the historical optimal process parameter combination in the database is obtained, and then the independent setting of the controller process parameters is realized. The reasons for the change of the sampling value of the intermittent surface measurement under the actual working condition are analyzed. According to the change of the value of adjacent sampling points in the keyway, the method of setting the trigger period in the internal synchronization mode is put forward.) in this paper, the influence of grinding wheel feed on the shape of the workpiece profile is considered in the grinding process. An online roundness evaluation method for dimension compensation in machining process is proposed. At the same time, the relationship and difference between on-line roundness evaluation and machine rear roundness evaluation are compared and analyzed. Under the condition of hardware platform and software support in laboratory, semi-automatic high-precision CNC grinder is used. A multi-function active measurement controller prototype, sensor, roughness meter and roundness instrument based on A8 microprocessor is developed. The key technologies mentioned above are analyzed or verified by experiments. The results show that the technical principle is reasonable and feasible. In this paper, the research on the key technology of multi-function grinding active gauge controller provides the technical theoretical support for the upgrading of the existing series of controllers, which is of great significance to enhance the intelligent level of the active gauge controller and expand the application range.
【学位授予单位】：郑州大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG596

【参考文献】