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本文详细介绍了如何采用激光干涉仪检测数控加工中心的定位精度,并利用检测数据对数控加工中心进行补偿。 相似文献
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在数控机床位置准确度检测中,激光干涉仪是最常用的仪器。我厂使用的是英国RENISHAW公司生产的ML10双频激光干涉仪,该仪器性能稳定、使用方便,但影响测量准确度的因素较多,在测量过程中必须加以考虑,并应采取措施减少或消除影响因素。 相似文献
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激光干涉仪作为数控机床的测量装置是集光学、精密机械、电控技术、数据处理、计算机技术于一体的高技术精密检测装置,采用完全非接触测量方式,实现数控车床在自动化方面的飞跃,在未来必将会有更为广阔的发展前景。当然面对不同的数控机床要采用不同的测量方式,并且对不同的测试结果进行科学的分析,要明确激光干涉仪在数控机床上的测量方式,把握双频激光干涉仪在数控车床检测中的应用,加强对激光干涉仪的使用快捷方式进行分析,最大限度地扩大激光干涉仪在数控机床测量方面的普及。 相似文献
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本文介绍了双频激光干涉仪的工作原理及齿条和丝杠传动车床的基本构成,利用激光干涉仪对车床定位精度的检测,分析车床的运动精度误差,根据分析结果对车床的传动部件做必要的调整,再对调整后的机床进行检测,根据定位误差得出相应数控系统的误差补偿数值,利用数控系统的补偿功能对机床定位进行补偿,以使机床的定位精度达到设计的标准值。 相似文献
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The present era is witnessing advancement in digital electronics and microprocessor which enables manufacturing sector capable
to produce complex components within small tolerance zone in the tune of nanometre and at one machining center. All motion
control systems have some form of position feed back system fitted with the machine. Such systems are not generally accurate
due to the errors in the positioning performance of the machine tool which will change over time to time due to wear, damage
and environmental effects. The complex structure of multi-axis CNC machine tools produce an inaccuracy at the tool tip caused
by kinematic parameter deviations resulting in manufacturing errors, assembly errors or quasi-static errors. Analysis of these
errors using a laser measurement system provides the manufacturers a way to achieve better accuracy and hence higher quality
output from these processes. In this communication, techniques to measure the linear positional errors of axes of CNC machine
tools by a laser interferometer calibration system and accuracy enhancement using the data obtained from the calibration cycle
by feeding into the machine’s controller with the help of linear error compensation package are discussed. 相似文献
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当前方法设计的系统对机床数控加工态势进行识别时,没有对噪声进行回放,对切割平面度、切割定位精度、机床平稳性进行识别时,识别结果不准确,存在识别准确率低的问题。该文提出高速激光切割机床数控加工态势识别系统设计方法,首先,通过运动控制卡,伺服控制模块及加工态势识别模块构成高速激光切割机床数控加工态势识别系统的架构;其次,在加工态势识别模块中设计系统初始化、态势识别、自动诊断报警、运动控制、图形转码和G代码编译等子模块,在此基础上,通过噪音采集、噪音回放和信号分析等方法提高加工态势识别的准确率;最后,采用HMM算法构建高速激光切割机床数控加工态势识别模型,实现加工态势识别。实验结果表明,加工态势设计方法设计的系统可有效识别机床的切割平面度、切割定位精度和机床平稳性,识别准确率较高。 相似文献
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The design methodology of a 2½-dimensional measurement and inspection system realized on a machine tool using a touch trigger probe and measuring G codes is studied in this paper. The reliability of measuring results, the agility of measurement, and user friendliness are synthesized in the design process. Algorithms for calibration and compensation of measuring errors are proposed to ensure the measuring accuracy by using a laser interferometer and ring gauges. Classification of probing feedrates and a collision-check algorithm can reduce measuring time and implement stylus-fracture-free measurements. To improve the previous onmachine measurement processes, all functions required for measurement and inspection processes are constructed as measuring G codes with similar forms of machining G codes. The interactive measuring program generating tool, which can automatically generate measuring G codes, is developed and potted in a ROM of a CNC, and can be called to perform an operation by the CNC without interfacing with personal computers. The validity and effectiveness of the developed system are verified on a horizontal machining centre with a Fanuc 15MA. 相似文献
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为解决航空制造领域复杂零件的加工难题,针对研制的复合进给电解加工机床,开发了基于PC( personal computer,个人计算机)和PMAC(programmable multi-axles controller,可编程多轴控制器)运动控制卡的开放式数控系统。基于虚拟仪器技术及其开发环境LabVIEW平台,遵循模块化设计思路,采用ActiveX自动化技术和CLF (call library function,调用库函数)节点设计了复合进给电解加工机床控制系统的人机交互界面,通过调用PMAC运动控制卡中的服务程序PmacServer,实现上位机与PMAC运动控制卡之间的功能交互。为了验证该控制系统的可靠性和运行稳定性,使用激光干涉仪进行了实验测试。实验结果显示,该控制系统响应迅速,运行稳定,人机交互界面易于操作;机床运动误差控制在-5~5 μm内,重复定位误差小于2.3 μm,能够满足航空发动机叶片的电解加工精度要求。研究结果在电解加工领域具有重要工程应用价值,可以为新一代高性能电解加工机床的设计提供参考。 相似文献
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目前CNC机床在线测量系统的校准方法在国内有用激光干涉仪、标准量块等一些用于企业的针对性方法,缺少适用于计量校准机构的校准方法,本文根据该系统的工作原理,对CNC机床在线测量系统的校准方法进行研究,提出几项计量特性参数,并结合实际情况设计了校准方案,研制了校准用计量标准器,分析了数据的处理方法.经研究表明,本文的校准方... 相似文献
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伺服进给系统的机电耦合特性直接影响数控机床的加工精度,单独针对伺服系统或机械系统建立的模型不足以准确分析系统参数对机床整机加工精度的影响。因此,综合考虑机床伺服系统与机械结构之间的耦合关系,建立伺服进给系统机电耦合动力学模型具有重要意义。首先,为保证伺服进给系统建模精度,利用状态空间法建立了机床机电耦合状态空间方程。其次,建立了伺服进给系统机电耦合Simulink模型,在此基础上采用复合控制提高系统的响应速度和加工精度。随后,利用多体动力学软件建立机床进给系统的刚柔耦合动力学模型,添加摩擦、阻尼等非线性因素,并导入Simulink与伺服系统建立耦合关系。最终,建立了卧式加工中心伺服进给系统的刚柔-机电耦合仿真加工平台,通过模拟机床加工轨迹以验证机电耦合状态空间模型的可靠性。结果表明:该状态空间模型能准确描述系统内部参数和系统输入输出的耦合关系;采用复合控制结构能有效提高系统的响应速度和加工精度。研究结果为数控机床的仿真建模和提高加工精度提供理论依据,为机床机电系统的设计提供有效指导。 相似文献
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This paper presents the development of an intelligent predictive tool for improving the accuracy of parts produced on CNC turning centers. Actual dimensions and shape (form) produced on components during machining differ from the nominal dimensions commanded in the CNC program. These dimensional and form errors on parts depend on a variety of factors such as tool/work deflections, machine tool accuracy, machining conditions etc. These errors, if predicted, can be used to correct the ideal CNC code and thus improve the part accuracy in CNC machining. In the present work artificial neural networks are used to capture the complex relationship between the errors on the component and the input process conditions. Significant improvement in part accuracy has been obtained using the corrected CNC code during machining. 相似文献
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Current tool path computation in the CAM algorithms approximates the surface by piecewise linear interpolation. In the case of three-axis machining on a CNC machine the tool will exactly reproduce this computed tool path. However in the case of five-axis simultaneous machining the real tool path on the CNC machine will not follow the linear approximation computed by the conventional CAM algorithm. A new CAM algorithm is proposed which approximates the surface to be machined by a piecewise curved approximation. This curve represents the real tool path followed on the five-axis machine. This piecewise curved approximation is further optimized by formulating the tool path computation as the generation of a grid based on a variational smoothness penalty function. This new algorithm considerably improves the accuracy and reduces the number of blocks and machining time. 相似文献