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Alignment method of on-machine measurement of workpiece clamping position based on iteration

A workpiece clamping and iterative technology, used in measuring/indicating equipment, metal processing machinery parts, manufacturing tools, etc., can solve the problem that the calculation results cannot truly reflect the workpiece, etc., so as to reduce the position error of the contact point and improve the accuracy. Effect

Active Publication Date: 2021-09-03
苏州千机智能技术有限公司
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  • Application Information

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Problems solved by technology

Due to the position deviation of the workpiece, there will be a deviation between the actual contact point of the probe and the planned theoretical measurement point, which will cause the trigger position of the probe read by the machine tool data receiver to be different from that when the probe touches the surface of the workpiece along the theoretical path. There is a deviation between the expected theoretical measured positions, and the calculation results cannot truly reflect the transformation of the workpiece from the current actual clamping position to the expected theoretical clamping position

Method used

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  • Alignment method of on-machine measurement of workpiece clamping position based on iteration
  • Alignment method of on-machine measurement of workpiece clamping position based on iteration
  • Alignment method of on-machine measurement of workpiece clamping position based on iteration

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Embodiment Construction

[0024] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present invention and implement it, but the examples given are not intended to limit the present invention.

[0025] In the present invention, the term "comprising" is intended to cover a non-exclusive inclusion, such as a process, method, system, product or device comprising a series of steps or units, not limited to the listed steps or units but optional Optionally also includes steps or units not listed, or alternatively also includes other steps or units inherent to these processes, methods, products or devices.

[0026] The rigid body transformation matrix T can be expressed as:

[0027]

[0028] Where R represents the rotation matrix, H represents the translation vector, V represents the perspective transformation vector, and S represents the overall scale factor. Since there is...

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Abstract

The invention discloses a method for correcting the clamping position of a workpiece based on iterative measurement on the machine. The clamping position of the workpiece is corrected by using the method of iterative measurement, so that the actual measurement point of the machine tool probe is gradually approached to the planned theoretical measurement point, and the Calculate the position transformation of the workpiece clamping based on the last measurement result, correct the coordinate system of the workpiece, and realize the alignment of the workpiece clamping position. The invention measures and calculates through an iterative method, and gradually aligns the workpiece under the rough reference, which can greatly reduce the problem of the contact point position error existing in the traditional single measurement method, thereby improving the accuracy of on-machine measurement and realizing More accurate workpiece clamping position alignment for workpieces with complex surfaces.

Description

technical field [0001] The invention relates to the technical field of on-machine measurement, in particular to an iteration-based method for correcting the clamping position of a workpiece in on-machine measurement. Background technique [0002] On Machine Inspection (OMI) is a method that uses machine tool hardware as a carrier during workpiece processing, attaches corresponding measuring tools, measures geometric features on the machine tool in real time, and guides subsequent process improvement based on the test results. Measurement. With the development of high-end CNC machine tools, digital measurement technology is gradually being introduced into the on-machine measurement of five-axis CNC machine tools, and is often used to correct the clamping position of workpieces under rough datums. High-end CNC machine tools generally have simple measurements such as measuring planes and measuring circle centers. The operator does not need to place the workpiece at the absolut...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23Q17/00B23Q17/22
CPCB23Q17/00B23Q17/2291
Inventor 颜利军唐祥武朱徐开
Owner 苏州千机智能技术有限公司
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