CN1847785A - Wide range and high precision free curved surface measuring method - Google Patents
Wide range and high precision free curved surface measuring method Download PDFInfo
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- CN1847785A CN1847785A CNA2006100401750A CN200610040175A CN1847785A CN 1847785 A CN1847785 A CN 1847785A CN A2006100401750 A CNA2006100401750 A CN A2006100401750A CN 200610040175 A CN200610040175 A CN 200610040175A CN 1847785 A CN1847785 A CN 1847785A
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Abstract
The wide range and high precision free curved surface measuring method includes setting the curved surface on one platform capable of shifting precisely in both X and Y directions, integrating laser displacement sensor and grating displacement sensor and linear coder, installing the laser displacement sensor onto one servo mechanism capable of moving in Z direction, obtaining the Z coordinates of the curved surface with the laser displacement sensor and grating displacement sensor and linear coder, and obtaining the X and Y coordinates with the precisely shifting platform. The present invention fuses several sensors, has the features of high efficiency, wide range and high precision in free curved surface measurement, and will find its wide application in manufacture technology.
Description
Technical field:
The present invention relates to a kind of method for automatic measurement of Free-form Surface Parts.
Background technology
With industrial circles such as the closely-related Aero-Space of manufacturing industry, automobile, mould, shipbuilding, Free-form Surface Parts has obtained application more and more widely.At present, the measuring method of free form surface mainly contains coordinate survey, binocular stereo vision method, laser triangulation, interferometric method, scanning survey method etc. successively, various measuring methods respectively have its relative merits, are difficult to satisfy simultaneously high-level efficiency, wide range and high-precision requirement.
Measurement to free form surface, following three kinds of main method are arranged generally: (1) three coordinate measuring machine contacts the integrated of gauge head and non-contact measuring head, because three coordinate measuring machine is in the widespread use of industry member, this method has obtained the broad research of Chinese scholars, adopt stereoscopic vision to be used for the testee in location scanning space as Carbone and V.Chan, generate measuring route and instruct gauge head to realize measuring; The CYCLON2 sweep measuring set of Britain Reinshaw company by the exchange of laser feeler and contact measuring head, can scan frangible, yielding body and accurate decorative pattern; The CMM intelligent checking system under the stereoscopic vision guidance has been studied by Xi'an Communications University, and automatic measurement of coordinates detection system of robot flexibility or the like was done by University Of Tianjin.Though this integrated approach has very high precision, realize intelligent measuring, reduce manual intervention and wrong and improve measuring speed and stable aspect be still waiting further investigation; (2) the line-structured light method of integration laser and CCD, REPLICA reverse-engineering system as U.S. 3D Scanners company, HUST based on linear structural laser profiling measuring system of CNC system etc., this method has characteristics such as wide range, big visual field, the information extraction of light line are simple, obtain the extensive concern of Chinese scholars in recent years, but that weak point is a precision is relatively low, marked ratio difficulty; (3) laser displacement sensor and CCD's is integrated, on CNC milling machine, developed free form surface laser non-contact measuring system as the Li Jian of Zhejiang University, Ju Hua studies gordian techniquies such as non-cpntact measurement planning and data processing and error compensations, its method is to adopt open type movement-control system, instruct measurement planning with machine vision, adopt laser displacement sensor directly to obtain the displacement of measuring the Z direction, this method is expected to realize quick measurement, surface reconstruction and digital control processing integrated, but since the laser displacement sensor measuring principle on non-linear, can not have wide range and high-precision characteristics concurrently.
Summary of the invention:
The object of the present invention is to provide a kind of wide range of free form surface in measuring and high-precision measuring method of the realization wide range free form surface of high-acruracy survey taken into account.
Technical solution of the present invention is:
A kind of high-precision measuring method of realizing the wide range free form surface is characterized in that: comprise the following steps:
(1) tested curved surface is placed can do X to Y on the platform that precision moves;
(2) laser displacement sensor is installed on the linear feeding platform that ball screw drove parallel with machine tool chief axis, form Z to linear moving mechanism, the displacement of servomotor control linear moving mechanism, linear encoder or grating sensor are loaded on the linear feeding platform, and laser displacement sensor, linear encoder or grating sensor are connected with information handling system;
(3) free form surface is divided into the cross section of a determining deviation according to the feature of tested free form surface, then each cross section curve is measured, path planning by tested free form surface characteristic Design, drive X to the platform that moves to precision with Y along Y to mobile spacing, obtain a cross section curve, drive then X to the platform that moves to precision with Y along X to mobile spacing, follow the tracks of the position of measured point by laser feeler, the motion of control servomotor, keep laser displacement sensor all the time at the center of its measurement range, obtain the Z coordinate of free form surface by the output of laser displacement sensor and grating displacement sensor or linear encoder, by the X of path planning to providing X to the platform that precision moves with Y, Y obtains the D coordinates value of tested free form surface to coordinate.
Can make X is the X-Y platform of three coordinate measuring machine or the worktable of numerical control machining center to the platform that moves to precision with Y.
The present invention adopts the method for the integrated fusion of multisensor, can possess high-level efficiency, wide range and high-precision characteristics simultaneously, can solve measurement range and the high precision technical barrier that be difficult to take into account of free form surface in measuring, for the high-acruracy survey of wide range free form surface provides a kind of new technical method, will be widely used in the manufacturing technology field.
Description of drawings:
The invention will be further described below in conjunction with drawings and Examples.
Accompanying drawing is the schematic diagram of one embodiment of the invention.
Embodiment:
Among the figure 1, servomotor, 2, machine tool chief axis, 3, motor driver, 4, motor movement control panel, 5, amplifier, 6, counter, 7, linear encoder or grating sensor, 8, the linear feeding platform, 9, scale, 10, ball-screw, 11, amplifier, 12, laser displacement sensor, 13, the reference position block, 14, can make X to the platform that moves to precision with Y, 15, tested curved surface.
A kind of high-precision measuring method of realizing the wide range free form surface comprises the following steps:
(1) tested curved surface 15 is placed can do X to Y on the platform 14 that precision moves;
(2) laser displacement sensor 12 is installed on the linear feeding platform 8 that the ball screw 10 parallel with machine tool chief axis 2 driven, form Z to linear moving mechanism, the displacement of servomotor 1 control linear moving mechanism, linear encoder or grating sensor 7 are loaded on the linear feeding platform 8, and laser displacement sensor 12, linear encoder or grating sensor 7 are connected with the routine information disposal system of being made up of amplifier 5, counter 6, amplifier 11, computing machine etc.;
(3) free form surface is divided into the cross section of a determining deviation according to the feature of tested free form surface, then each cross section curve is measured, path planning by tested free form surface characteristic Design, drive X to the platform 14 that moves to precision with Y along Y to mobile spacing, obtain a cross section curve, drive then X to the platform that moves to precision with Y along X to mobile spacing, follow the tracks of the position of measured point by laser feeler, the motion of control servomotor 1, keep laser displacement sensor 12 all the time at the center of its measurement range, obtain the Z coordinate of free form surface by the output of laser displacement sensor 12 and grating displacement sensor or linear encoder 7, by the X of path planning to providing X to the platform that precision moves with Y, Y obtains the D coordinates value of tested free form surface to coordinate.Can make X is the X-Y platform of three coordinate measuring machine or the worktable of numerical control machining center to the platform 14 that moves to precision with Y.
Claims (2)
1, a kind of high-precision measuring method of realizing the wide range free form surface is characterized in that: comprise the following steps:
(1) tested curved surface is placed can do X to Y on the platform that precision moves;
(2) laser displacement sensor is installed on the linear feeding platform that ball screw drove parallel with machine tool chief axis, form Z to linear moving mechanism, the displacement of servomotor control linear moving mechanism, linear encoder or grating sensor are loaded on the linear feeding platform, and laser displacement sensor, linear encoder or grating sensor are connected with information handling system;
(3) free form surface is divided into the cross section of a determining deviation according to the feature of tested free form surface, then each cross section curve is measured, path planning by tested free form surface characteristic Design, drive X to the platform that moves to precision with Y along Y to mobile spacing, obtain a cross section curve, drive then X to the platform that moves to precision with Y along X to mobile spacing, follow the tracks of the position of measured point by laser feeler, the motion of control servomotor, keep laser displacement sensor all the time at the center of its measurement range, obtain the Z coordinate of free form surface by the output of laser displacement sensor and grating displacement sensor or linear encoder, by the X of path planning to providing X to the platform that precision moves with Y, Y obtains the D coordinates value of tested free form surface to coordinate.
2, the high-precision measuring method of realization wide range free form surface according to claim 1 is characterized in that: can make X is the X-Y platform of three coordinate measuring machine or the worktable of numerical control machining center to the platform that moves to precision with Y.
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| CNB2006100401750A CN100387931C (en) | 2006-04-28 | 2006-04-28 | Wide range and high precision free curved surface measuring method |
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| CN101398291B (en) * | 2007-09-25 | 2010-12-01 | 宝山钢铁股份有限公司 | Band steel tracking imaging vision detection method |
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| CN110340159A (en) * | 2019-06-13 | 2019-10-18 | 山西大学 | A kind of device for a wide range of plate thickness measurement of hot rolled strip |
| CN110405259A (en) * | 2019-08-07 | 2019-11-05 | 合肥学院 | Free form surface class part system of processing based on multi-sensor integral measuring |
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