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On-line measurement

  随着现代制造企业对于制造效率和工件品质提出了越来越高的要求,要求在制造的车间现场实现对于加工工件测量,完成各种工装与模具的现场尺寸测量与验证,并实时监控装配的状况。通过这种方法,能够实时反馈装配与加工的质量,并为生产过程的调整以及品质检控提供依据。
  原来那种加工完成后交由计量部门进行公差和精度验证的方式已经越来越不能适应,而要求测量设备工作在车间现场,一般来说需要在两个方向上进行努力与调整。
  一是能够克服车间环境对精密测量系统的影响,并能够适应现场生产对于高效率的要求。
  不同于计量室,生产现场将面临着环境温度条件无法达到像计量室那样严格的控制,同时还存在着对测量精度有着严重影响的振动、粉尘、油污等状况。要适应在车间现场的测量需要,测量系统需要配备温度补偿系统,通过软件和传感器补偿由于温度变化对测量精度的影响。最简单的是线性温度补偿,通过在被测工件以及每个机器轴的两端放置温度传感器,感应温度的变化,并进行实时的补偿。考虑到机器结构随着温度变化不是一个简单的线性变化,更高端的引进了结构温度补偿的概念。比如Hexagon计量产业集团测量系统所具有的CLIMA以及ACTIV温度补偿系统,通过在机器核心位置放置多个温度传感器,并利用测量机自身的结构模型分析技术,实现了在16-26度以及15-35度温度条件下的结构补偿,有效确保了在复杂温度环境下的系统精度。
  一些机型,如来自Hexagon计量产业集团的Bravo、SIRIO以及ONE机型,就专门为车间现场的测量需要而设计,机器具有强健的机构,适合复杂环境的需要,具有高效率以及完善的温度补偿系统,甚至是整机不需要压缩空气,只要一个电源插座,就可以保证系统在生产现场高精度工作。这些机型,都是考虑现代用户的特殊计量需要而专门为在车间现场使用设计。
  另外,考虑到车间现场特殊环境以及对于测量效率以及与生产线进行整合等一系列的要求,测量厂家往往通过系统解决方案或者说是交钥匙工程的方式帮助用户解决这方面的问题。这包括了隔振系统的设计、温控间设计与建立、手动和自动上下料系统以及各种专用与通用夹具等方面的内容。
  二、便携测量系统为现场使用提供了便利
  具有高移动性的各种便携式测量系统,如方便灵活的关节臂测量机、大尺寸的激光跟踪仪以及具有最快数据捕捉与测量能力的白光测量系统,为现场的使用提供了良好的手段与方法,对于那些大、不便于移动以及需要及时提供测量数据以便进行后续调整或修复的任务,提供在方便快捷的方法和手段。也是固定式测量系统之外的测量领域的一大革新。
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