CNC机床在线测量系统校准方法研究

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...     

数控机床在线测量系统校准技术研究

数控机床在线测量技术广泛应用于薄型、复合材料等大型加工工件的在线测量,以确保工件的加工质量符合要求。针对目前数控机床在线测量系统校准工作中存在的工作现场环境条件干扰和校准过程耗时较长问题,本文根据实际工作中的技术要求,采用双频激光干涉仪、成组球规等标准器组成校准系统,提出一种适用于企业内部的数控机床在线测量系统校准技术,结合补偿技术提供单位间距的修正量,确保轴线长度示值误差符合技术要求。经实验证明,该校准方法准确性好,工作效率高,具有技术推广价值。     

浅谈数控机床在线测量技术

测量技术的不断发展使得数控机床在线测量技术的研究势在必行。本文概括的对数控机床在线测量技术进行了介绍,包括在线测量系统的组件结构、测量原理、在线测量系统在线检测误差的来源及误差分析。     

真空计在线校准系统的研制

为了解决真空计在线校准的问题,研制出一种真空计在线校准系统.真空计在线校准系统通过优化设计、材料及工艺处理已解决宽量程校准的问题.通过对在线校准技术的研究,采用比较法校准方法,以三台高精度的薄膜真空计和一台高精度电离真空计作为参考标准,解决了校准条件与使用条件基本一致性问题,可以减小量值传递过程产生的不确定度,保证测量...     

CCD在线式图像尺寸测量系统的自动化校准装置研究

目前,国内尚无在线式影像(图像)测量系统相关的标准和校准规范。为了统一技术要求,本文研制符合基于公差带位置判别废品原理的标准器组用以校准测量系统的尺寸精度,同时研究校准方法,解决量值溯源问题。为了实现高效的在线校准,提出一种磁电传感器内嵌式交流伺服技术方案,设计基于一体型伺服的自动化校准装置,解决装置物理尺寸大、在线校准时间长等问题。同时,为保证校准结果可靠性和一致性,研究标准器位置角度偏移自修正补偿算法,解决校准过程中标准器明显角度偏移影响校准结果的问题。     

数控机床在线测量误差分析

本文概述数控机床在线测量系统后，主要讨论了数控机床在线测量的误差来源与种类，并进行了误差分析。     

安全阀在线校验仪的一种溯源方法

对安全阀在线校验仪进行校准是实现测量数据量值溯源,保证测量结果准确、一致的重要手段。分析了安全阀在线校验仪的测量原理和技术指标,提出一种以标准测力仪为参考标准对安全阀在线校验仪进行校准的方法,介绍了该校准方法的控制要求和实施步骤,对校准结果的不确定度进行了分析评价。     

温湿度一体校准仪现场在线校准方法

便携式温湿度校准仪具有现场在线、温湿度同时测量校准的功能,主要用于大、中型环境监控系统温度和湿度的现场校准。由于国内对于温湿度一体传感器同时测量和现场在线测量没有专门的标准或规范,本文主要针对试用过程中,测量校准方法和经验进行分析研究,论述在线温湿度一体同时测量校准的基本方法,利用温湿度的关系提高湿度发生器效率的方法、被测值的稳定判断与读取方法。按照这些方法,可保证正确的测量数据,提高约一倍的工作效率,有效的完成现场在线测量校准。对于同类温湿度校准仪的使用也具有借鉴意义。     

一种新型的推力标定装置

推力校准在推力测量中占有举足轻重的地位,其校准精度直接影响测量结果。传统的校准方式精度差,效率低,已经无法满足当前的测量要求。本文提出了一种新型的在线推力校准系统,通过汽缸配合伺服电机产生稳定拉力,由压力控制系统、拉力活塞系统以及标准力传感系统形成闭环PID控制系统,实现拉力的精确控制,数据采集系统采集被校力值在上位机完成最终计算。     

美国向我赠送激先5维测量系统

美国自动精密工程公司（API）向中国计量科学研究院（NIM）赠送激光SD测量系统装置仪式于7月21日在北京五洲大酒店举行。国家技术监督局副司长王以铭，中国计量院院长潘班必出席了赠送仪式。这是该公司对计量院长期合作愿望的友好表示。激光5D激光测量系统包括光学、电子系统和控制计算机的全套软件，这套系统能快速完成坐标测量机（CMM）和精密机械加工中心（CNC）校准及误差图形的绘制，坐标测量机的校准、数控机床精密加工中心的检测，机械零件、几何形位、测长、测角等5个自由度的同步测量。曾在美国获得“先进技术成果奖”、“19…     

Synthesis of the measurement system on the machine tool

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.     

激光在线校准测量

许多工业制造装备的工作过程中,需实施不同规格回转体直径及安装偏心量的快速校准测量,以保证可靠.性.研究组合式激光在线校准系统的工作机理,建立相应的测量信号表达式,给出系统设计的一般原则,理论分析结果表明,校准系统能够实现微米级的校准精度,结合系统在高精度PCB锣钻机的应用实践,理论与实际的吻合性较好.文中提出的分析方法可应用于车床,铣床,加工中心等需实施回转体直径和偏心量的快速在线校准设计.     

Intermittent process hybrid measurement system on the machining centre

This study introduces the development of a hybrid measurement system integrated on a machining centre to carry out the possible intermittent measurement of a workpiece. The developed hybrid measurement system principally consists of a MP10 touch trigger probe system, a circular triangulation laser probe system, and the measurement software. The touch trigger probe system was primarily used to measure the regular geometric features, whereas the circular triangulation laser probe system was adopted to inspect the freeform surface part of a test carrier with the help of the developed measurement software. An adjustment device consisting mainly of an adjustment unit, a joint unit, and an assembly unit, was designed and manufactured to minimize the cosine error caused by the assembly inaccuracy for the laser probe. The measuring uncertainty analysis experiments for both the touch trigger probe system and the non-contact laser probe system were investigated by using a calibrated standard sphere and the HP5529A laser interferometer system, respectively. The information in the whole measuring system – which comprised a personal computer, a CNC machining centre controller, a Renishaw MP10 touch probe system, and the controller of a Wolf & Back OTM3A20 circular triangulation laser probe system – was integrated technically. The measurement software was also developed to simulate the measuring path, prevent collision, and generate the corresponding measuring NC codes. The developed system can also be used to digitize the data points of a 3D small complex workpiece, such as a tooth model and an IC part. A carrier, combined with free form surface and regular geometric feature referred to in the ISO 10791-7 cutting test standard, was designed, manufactured and inspected in order to evaluate the performance of the developed hybrid measuring system. The measurement results of this carrier were verified through a CNC coordinate measuring machine, with satisfactory consistency. According to the measuring results, the developed hybrid measuring system was successfully and effectively used to carry out the intermittent measurement.     

高精度光栅测长机校准及不确定度分析

本文论述了测长机和测长仪的区别,高精度光栅测长机应归于测长仪类,适用于JJF 1189-2008《测长仪校准规范》.校准高精度光栅测长机,需严格控制环境温度,测量小尺寸量块需考虑两球形测头不同心引入的误差,测量内尺寸以两环规直径差作为标准值,测得值可用平均值代替最大值,分析了二等量块校准光栅测长机外尺寸示值误差的测量不...     

Enhancement of accuracy of multi-axis machine tools through error measurement and compensation of errors using laser interferometry technique

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.     

激光干涉仪在测长机不确定度评定中的应用

依据测长机校准规范中关于分米刻度尺的校准方法,为了尽可能消除测量过程中的各类误差,保证校准数据真实可靠,本文利用激光干涉仪对测长机分米刻度尺进行示值误差的不确定评定,评定结果小于测长机分米刻度尺误差的三分之一,满足精度要求,可供从事测长机校准工作人员参考。     

基于坐标测量机的步距规激光校准系统

该文介绍坐标测量机与激光干涉仪对步距规进行校准的测量原理和测量过程,测量结果与DKD证书进行对比,并分析测量结果的不确定度。     

步距规校准装置

利用坐标测量机和激光干涉仪的信号合成技术,构成步距规校准装置,实现多示值标准器的高精度校准.介绍了仪器的构成、原理、软件框图等,并进行了详细的不确定度分析.