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A Method of Calibrating the Mathematical Model of Coordinate Measuring Machine to Compensate the Dynamic Error Caused by Deformation

A mathematical model, a technique for calibrating measurements, used in measuring devices, instruments, etc.

Active Publication Date: 2017-03-01
HEXAGON METROLOGY SPA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Also due to the lightweight construction of the moving parts, this deformation can be significant for measurement accuracy

Method used

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  • A Method of Calibrating the Mathematical Model of Coordinate Measuring Machine to Compensate the Dynamic Error Caused by Deformation
  • A Method of Calibrating the Mathematical Model of Coordinate Measuring Machine to Compensate the Dynamic Error Caused by Deformation
  • A Method of Calibrating the Mathematical Model of Coordinate Measuring Machine to Compensate the Dynamic Error Caused by Deformation

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Experimental program
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Embodiment Construction

[0034] figure 1 A bridge type measuring machine 1 is shown, which includes a mobile unit 7 and a base 5 equipped with a flat horizontal upper surface 6 or a reference plane.

[0035] The moving unit 7 includes a motor-driven support 8 that moves on the base 5 along the first horizontal axis (Y axis) of the X-Y-Z Cartesian reference system of the measurement space.

[0036] The bracket 8 has a bridge structure and includes two vertical columns 8a and 8b, and an upper horizontal cross member 8c extending between the upper ends of the vertical columns 8a and 8b.

[0037] At the bottom, the upright 8a comprises a motor-driven sliding device 9 which slides on the guide 11 parallel to the Y axis and is obtained adjacent to the longitudinal edge of the base 5 in a known manner.

[0038] The cross member 8c carries a sliding device 10 that moves on a guide device (not shown) along an axis parallel to the second axis (X-axis) of the reference system.

[0039] A vertical column 12 movable along t...

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Abstract

The invention relates to a method for calibrating a coordinate measuring machine mathematical model to compensate dynamic errors caused by deformation. A method of calibrating a mathematical model to compensate for errors caused by dynamic deformations of a measuring machine equipped with a movement unit capable of moving a stylus probe in a measurement space, wherein the model responds to said driving means (13) A plurality of output quantities are provided from at least one input quantity related to the control signal of the control signal, the output quantity including at least one component of the measurement error caused by the deformation and at least one quantity related to the deformation detected by the laser sensor. During the calibration step, the mobile unit is subjected to a motion cycle consisting of oscillations of small amplitudes of variable frequency following the law of sinusoidal motion, keeping the tip of the probe blocked; during this motion cycle the input and output quantities are sampled, and fed to the algorithm for model identification.

Description

Technical field [0001] The invention relates to a method for calibrating a mathematical model of a coordinate measuring machine to compensate for dynamic errors caused by deformation. Background technique [0002] As we all know, a coordinate measuring machine usually includes three supports, which can move along the coordinate axis of a Cartesian reference system and can move the measurement sensor in the measurement space. The measuring machine can provide the coordinates of the workpiece detected by the measuring sensor as an output, and the coordinates are calculated based on the position of the bracket along the respective axis. [0003] More specifically, the coordinate measuring machine includes: a base structure equipped with a guiding device running along a first axis, such as a base or columnar structure made of granite or other materials; A first support that moves upward; a second support that is carried by the first support and can move along a second axis orthogonal ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B21/00
CPCG01B21/042G01B21/04G01B21/045
Inventor G·加斯科
Owner HEXAGON METROLOGY SPA