Contact measurement error compensation method oriented to freeform surface and compensation system

A contact measurement and error compensation technology, used in measurement/indication equipment, metal processing machinery parts, metal processing equipment, etc., can solve the problem of the theoretical measurement point and the actual measurement point of the probe ball center radius compensation do not coincide.

Inactive Publication Date: 2014-01-01
HARBIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention mainly aims at the problem of center radius compensation of probe, misalignment of theoretical measurement poin

Method used

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  • Contact measurement error compensation method oriented to freeform surface and compensation system
  • Contact measurement error compensation method oriented to freeform surface and compensation system
  • Contact measurement error compensation method oriented to freeform surface and compensation system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] A contact measurement error compensation system facing a free-form surface, comprising: a ruby ​​probe 1, the ruby ​​probe is connected with a ceramic measuring rod 2, and the ceramic measuring rod is connected with a pressure sensor 3, and the The pressure sensor is connected with the signal transmitter 4, the pressure sensor is connected with the handle 5, the handle is connected with the three-axis machine tool 6, the signal transmitter and the signal receiver 7 are connected by wireless signals, and the The signal receiver is installed on the three-axis machine tool, the signal receiver is electrically connected to the JA40 interface of the three-axis machine tool, and the three-axis machine tool is electrically connected to the host computer 8 .

Embodiment 2

[0060] The compensation method of the above-mentioned contact measurement error compensation system facing the free-form surface,

[0061] (1) Two-dimensional surface machining error compensation method:

[0062] For surfaces represented by 2D curves, first select a measurement guide point , the boot point The role in the model is to use the intersection of the Z-axis of the guide point and the offset surface to obtain the center of the probe at the theoretical measurement point; in actual measurement, guide the ruby ​​side head to find the corresponding matching point on the model on the actual workpiece for measurement ;

[0063] Then offset the ideal surface δ of the workpiece to obtain the offset surface of the probe sphere center , at this time the offset surface and guide point There is an intersection in the vertical direction of ( , , ), that is, the center of the theoretical probe sphere, The point is the theoretical measurement point. If it is an ...

Embodiment 3

[0090] According to the compensation method of the free-form surface-oriented contact measurement error compensation system described in embodiment 2, the above-mentioned algorithm is compiled into the post-processing module of the measurement system, and error compensation is realized in the post-processing module; after the measurement is completed, open the In the measurement report module of the computer measurement system, click the export measurement report menu to export point information and point error information; first, check whether the measurement error (ΔX, ΔY, ΔZ) is within the acceptable range by analyzing the point information and point error information , if the workpiece is qualified within the acceptable range, otherwise it is unqualified; secondly, through the analysis of point information and point error, it is determined whether the error is caused by the measurement error or the machine tool error, or the workpiece processing error; through the processing...

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Abstract

The invention discloses a contact measurement error compensation method oriented to a freeform surface and a compensation system. After small-size workpieces are detected, if the workpieces are not qualified, the workpieces need to be remounted in a machining center for secondary finishing and machining, and a secondary chuck-mounting error is accordingly caused; for large-size workpieces, the problems such as secondary chuck-mounting error also can be caused. The contact measurement error compensation method oriented to the freeform surface consists of a ruby measuring head (1), wherein the ruby measuring head is connected with a ceramic measuring rod (2), the ceramic measuring rod is connected with a pressure sensor (3), the pressure sensor is connected with a signal transmitter (4), the pressure sensor is connected with a cutter handle (5), the cutter handle is connected with a three-axis machine tool (6), the signal transmitter is connected with a signal receiver (7) through wireless signals, the signal receiver is mounted on the three-axis machine tool, the signal receiver is electrically connected with the JA40 interface of the three-axis machine tool, and the three-axis machine tool is electrically connected with a computer host (8). The contact measurement error compensation method oriented to the freeform surface and the compensation system are applicable to the error measurement of common planes and freeform surfaces.

Description

Technical field: [0001] The invention relates to a free-form surface-oriented contact measurement error compensation method and compensation system. Background technique: [0002] With the development of industry, higher and higher precision requirements are put forward for processing. The traditional measurement method is generally offline measurement, that is, after the processing of the machining center is completed, the workpiece is unloaded and placed on a three-coordinate measuring machine or other testing equipment. detection. For small workpieces, off-line measurement and handling are more convenient, but after the inspection is completed, if it is unqualified, it needs to be reinstalled on the machining center for secondary trimming, which will cause secondary clamping errors. For large workpieces, it will not only cause secondary clamping errors, but also inconvenient handling and waste of man-hours. Therefore, online measurement becomes particularly important. ...

Claims

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Application Information

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IPC IPC(8): B23Q17/20
CPCB23Q17/20
Inventor 吴石王正春王义文刘献礼刘立佳
Owner HARBIN UNIV OF SCI & TECH
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