Method and apparatus for inspecting workpieces

一种工件、设备的技术，应用在坐标测量设备领域，能够解决难以确立、耗费时间、未知的等问题

Inactive Publication Date: 2014-05-28
RENISHAW PLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

it takes time
also, in changing circumstances, the frequency with which such re-establishment of standards will be required is variable and may be unknown or difficult to establish

Method used

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  • Method and apparatus for inspecting workpieces
  • Method and apparatus for inspecting workpieces
  • Method and apparatus for inspecting workpieces

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0049] exist figure 1 In the coordinate measuring machine shown, a workpiece 10 to be measured is placed on a table 12 which forms part of the fixed structure of the machine. A probe having a body 14 is mounted to a movable platform member 16 . The probe has a displaceable elongated stylus 18 which, in use, contacts the workpiece 10 for metrology measurements.

[0050] The movable platform member 16 is secured to a fixed structure of the machine by a support mechanism 20 (only a portion of which is shown). In this embodiment, the supporting mechanism 20 is as described in International Patent Applications WO03 / 006837 and WO2004 / 063579. It comprises 3 telescopically extendable struts 22 extending in parallel between the platform 16 and the fixed structure of the machine. Each end of each strut 22 is all pivotally connected to the platform 16 or the fixed structure respectively, and is extended and retracted by a respective motor. The amount of extension is measured by the r...

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PUM

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Abstract

A series of nominally identical production workpieces is measured on a measuring apparatus. To correct for temperature variations, one of the workpieces forms a master artefact, the dimensions of which are known, e.g. by external calibration. The master artefact is measured on the measuring apparatus at two or more temperatures, producing two or more corresponding sets of measured dimensional values of the master artefact at the respective temperatures. One or more error maps or look-up tables or functions are generated which relate the measured dimensional values of the master artefact to the known dimensions of the master artefact. The error map(s), look-up table(s) or function(s) are dependent on the respective temperatures at which the master artefact was measured. Correction values derived from the error map(s), look-up table(s) or function(s) are used to correct the measurements of production workpieces in the series. These correction values are determined in dependence upon the temperature at which the workpiece measurements were obtained.

Description

technical field [0001] This invention relates to measuring equipment for inspecting the dimensions of workpieces, and more particularly to coordinate measuring equipment. Coordinate measurement equipment includes, for example, coordinate measuring machines (CMMs), machine tools, manual coordinate measuring arms, and inspection robots. Background technique [0002] It is routine to inspect workpieces after they have been produced on a coordinate measuring machine (CMM) that has a movable part supporting a probe that can be driven within the three-dimensional work volume of the CMM. [0003] The CMM (or other coordinate measuring device) may be a so-called Cartesian machine in which the movable part supporting the probe is mounted via three series-connected carriages that can each be positioned in three normal positions. Move in the direction X, Y, Z. Optionally, the CMM may be a non-Cartesian machine, for example, including 3 or 6 extendable struts (struts), each of which i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B5/00G01B21/04
CPCG01B5/0014G01B5/008G01B21/045G01B21/042
Inventor 凯文·巴里·乔纳斯利奥·克里斯托弗·萨默维尔
Owner RENISHAW PLC
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