CN1737495A - Method for measuring bore diameter with fixed direction utilizing three coordinate measuring machine - Google Patents
Method for measuring bore diameter with fixed direction utilizing three coordinate measuring machine Download PDFInfo
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- CN1737495A CN1737495A CNA2005100571649A CN200510057164A CN1737495A CN 1737495 A CN1737495 A CN 1737495A CN A2005100571649 A CNA2005100571649 A CN A2005100571649A CN 200510057164 A CN200510057164 A CN 200510057164A CN 1737495 A CN1737495 A CN 1737495A
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Abstract
This invention discloses one method to measure the hole radium with certain direction by use of three coordinate test machine, which comprises the following steps: a, first establishing space coordinate system in the hole to be tested with Z axis on the axis line of the hole and with coordinate origin on the center of the circle by crossing the axis line and end of the hole to let the X axis through the center to form one fixed space coordinate system thorough Z, X and Y axis; b, letting the coordinate move along X axis through the program setting of the coordinate machine to separately test the two ends of hole radium and computing and connecting two ends, which is the radium along X direction.
Description
Technical field
The present invention relates to a kind of bore diameter measuring method of product.
Background technology
Principle according to the measurement aperture that has the setting of three coordinate measuring machine original program now, its method of measuring the aperture is: adopt some spots (can be provided with according to actual needs) on same circular section, fit to a least square circle (is the circle of φ as the diameter among Fig. 1) by these points, the three coordinate measuring machine handling procedure will be the diameter of least square diameter of a circle as measured hole.The diameter in the hole that draws by this method is actually the mean diameter of this hole on this cross section, and there is deviation in this and hole at the actual diameter of a certain prescribed direction, and this deviation causes very important measuring error in actual applications sometimes.As shown in Figure 1, for same circle, with the detected diameter value of three coordinate measuring machine original program is φ (being the least square circular diameter), and the diameter that actual needs detects φ ' (position of or φ "); its diameter value should be φ ' (or φ "), both can produce an error φ-φ ' (or φ-φ "), this error amount maximum can reach the deviation from circular from of measured hole; the deviation from circular from such as the hole is 8 μ m, the maximum error of then measuring diameter can reach 8 μ m.The deviation from circular from of measured hole is big more, and the error that this measuring method produces is just big more.
Along with making rapid progress of science and technology, representing the motor car engine manufacturing industry manufacture level in advanced technology field improving constantly, occurred many online high, precision and frontier checkout equipments simultaneously, under being rigid in checking up of these checkout equipments, the quality of engine improves constantly.In the long term, high Precision Detection equipment has not only improved the accuracy rate that detects, and has improved work efficiency greatly, has reduced the engine manufacturing cost, and it has also represented the level of engine shop simultaneously.
High Precision Detection equipment has obtained increasing application on the production line of each engine shop, as cylinder body, the cylinder cap on-line detector that the famous manufacturer of internationally famous online detection instrument Italy MARPOSS (horse Persian) company produces, the cylinder cap on-line detector that German HOMMELWERKE (Huo Meier) company produces etc.
Along with the widespread use aborning of high Precision Detection equipment, how to assert whether the precision of checkout equipment itself meets technological requirement, to metrological service new problem has been proposed.Because these equipment all are specialized equipments, structure and detection principle are special, and the precision height, and there is certain limitation in traditional transmission of quantity value mode to it.
M125 type inductance machines with Italian MARPOSS company is an example, this machines precision height, and the uncertainty of instrument is less than or equal to 4 μ m, is full-automatic checkout equipment.Its measuring principle is as shown in Figure 2: the diameter two ends at the cylinder gauge head are arranged to right sensor respectively, when surveying work carries out, the cylinder gauge head enters in the hole, sensor contacts with endoporus, go out to go up the diameter of circular section by No. 1 and No. 2 sensor, No. 3 and No. 4 sensor go out the diameter in middle circle cross section, and No. 5 and No. 6 sensor go out the diameter of circular section down, get the diameter value of corresponding circular section according to demand.
Confirm whether its accuracy of detection meets the requirements, can only adopt measurement instrument magnitude transferring method commonly used---comparison method, promptly by a workpiece, value that the inductance machines is measured and standard measurement equipment are measured the value that same workpiece draws and are compared, and whether its difference is in error range.Because the uncertainty of inductance machines is less than or equal to 4 μ m, according to the transmission of quantity value principle, the uncertainty that is used for the standard measurement equipment of value comparison should be less than 1.3 μ m.Though resembling precision measuring instrument precision such as universal tool-measuring microscope, horizontal metroscope, gauging machine, bore measuring instrument can meet the demands, but because the restriction of measurement range, with all realizing measuring to workpiece, though and metering type three coordinate measuring machine measurement range can satisfy, but because the difference of measuring principle, very important method error (as the description of front) can be produced, thereby the requirement of checkout equipment transmission of quantity value can't be satisfied.
Summary of the invention
The objective of the invention is to propose a kind of method of three coordinate measuring engine measurement bore diameter with fixed direction, improve measuring accuracy, adapt to the transmission of quantity value requirement of online high Precision Detection equipment at the prior art above shortcomings.
This method is to measure the two-end-point of the diameter of measured hole on prescribed direction respectively with three coordinate measuring machine, connects the distance between the two-end-point again, the diameter on prescribed direction of must portalling (the part three coordinate measuring machine need carry out the gauge head compensation), promptly point-to-point measurement.The key of this method is rationally to set up coordinate system, when on three coordinate measuring machine, measuring endoporus least square diameter of a circle, there is not specific (special) requirements to setting up coordinate system, but during the three-dimensional coordinates measurement bore diameter with fixed direction, if coordinate system is set up incorrect, what measure may not be the diameter in hole, and may be the chord length of circle, or oval diameter or chord length.
The step of this measuring method is as follows:
1, at first in treating side opening, set up space coordinates:
(1) the space coordinates volume coordinate Z axle of measuring is based upon on the axis of tested element (being tested metering-orifice);
(2) true origin is based upon on the center of circle of measured circle, the axis that the center of circle of measured circle can be by the hole and the end face of cylindrical hole intersect and obtain;
(3) allow the center of circle of X-axis by measured circle;
(4) generate Y-axis automatically according to established Z axle, X-axis and true origin, promptly form fixing space coordinates;
2, by the program setting of three coordinate machine, allow the three-dimensional probe move, respectively two terminal A of detection aperture along X-direction
1Point and B
1Point by the three-dimensional data processor, connects A
1And B
1Distance, be the diameter of hole at directions X.
According to the volume coordinate principle as can be known, in a certain coordinate system, any one spatial point can use volume coordinate (x, y, z) expression, when coordinate system changes, its coordinate figure x, y, z also will change.In our measuring process, at first consider to set up the Z axial coordinate of coordinate system, in case the Z axle has been determined, XY plane vertical with the Z axle in the three coordinate measuring machine program has just generated automatically, because the three-dimensional probe moves along coordinate plane and coordinate axis, if therefore the Z axle deviates to Z ', shown in Fig. 3 A and Fig. 3 B, to cause the XY plane inclination, the result who measures will not be the circular section, but oval cross section, thereby the diameter that draws neither diameter of a circle, but oval axle, promptly when setting up the Z axle, avoid the error of perpendicularity, in this three-dimensional coordinates measurement bore diameter with fixed direction method, the way that solves is that the space coordinates volume coordinate Z axle that will measure is based upon on the tested element, the very effective error of perpendicularity of avoiding of energy; Consider the foundation of X-axis again, as shown in Figure 4, translation cannot take place in the X-axis of setting up, if generation translation, what the probe of three coordinate measuring machine was measured along X-axis will not be diameter of a circle, but chord length, in three-dimensional coordinates measurement bore diameter with fixed direction method, the way of solution is to allow the center of circle of X-axis by measured circle; Simultaneously true origin is based upon on the center of circle of measured circle, three coordinate measuring machine will be according to established Z axle, and X-axis, true origin generate Y-axis automatically, forms a fixing coordinate system.
As seen, on three coordinate measuring machine during detection aperture, measurement result was the mean diameter in hole, had than big-difference with the actual demand state sometimes originally; And this three-dimensional coordinates measurement bore diameter with fixed direction method under the situation of rationally setting up coordinate system, can detect the diameter that go up in any direction in the hole according to actual needs exactly.
This method is used the transmission of quantity value work of online high Precision Detection equipment, with three coordinate measuring machine and online high Precision Detection equipment same workpiece is detected respectively, by testing result is compared, uncertainty that can the online high Precision Detection equipment of correct calculation, thus whether determining apparatus meets technological requirement.By three-dimensional coordinates measurement bore diameter with fixed direction method, eliminated the method error in the above transmission of quantity value effectively.
Through the applicant reliability of this method is examined demonstration: the diameter of measuring the same position of same ring gauge less than the precision aperture instrument of 0.5 μ m less than three coordinate measuring machine and the uncertainty of 1.2 μ m with uncertainty respectively, compare two measurement results, its difference is in the error range that allows.
Description of drawings
Fig. 1 is that three coordinate machine is measured least square circular hole footpath and bore diameter with fixed direction principle comparison diagram
Fig. 2 is that the M125 type inductance machines of Italian MARPOSS company detects schematic diagram
Fig. 3 A and Fig. 3 B are analysis of measurement errors figure
Fig. 4 is the measuring process synoptic diagram
Embodiment
Here be example with three-dimensional coordinates measurement machine testing three-cylinder engine cylinder body cylinder bore dia, the detailed process of three-dimensional coordinates measurement bore diameter with fixed direction method is described.
As shown in Figure 4, when measuring the diameter of first cylinder hole directions X, at first measure a cylinder (being cylinder hole 1), draw the axis in cylinder hole 1, as coordinate Z axle; In cylinder hole 1, measure a circle, be projected on the XY plane, in cylinder hole 2 (perhaps the cylinder hole 3), measure a circle again, connect O with Same Way
1And O
2(or O
3) in alignment, as X-axis; True origin O is based upon on the axis in cylinder hole 1, instrument will generate the coordinate system that detects 1 aperture, cylinder hole automatically.By the program setting, allow the three-dimensional probe move along X-direction, detect A respectively
1Point and B
1Point by the three-dimensional data processor, connects A
1And B
1Distance, be the diameter of cylinder hole 1 at directions X.
Measure the diameter of other any one direction if desired, as long as coordinate system is rotated needed angle around the Z axle, under the new coordinate system in order on method can realize measuring.
Claims (1)
1, utilize the method for three coordinate measuring engine measurement bore diameter with fixed direction, measuring process is as follows:
(1) at first in treating side opening, set up space coordinates:
The space coordinates volume coordinate Z axle of measuring is based upon on the axis of tested metering-orifice;
True origin is based upon on the center of circle of measured circle, the center of circle of measured circle is by the axis of tested metering-orifice and crossing the obtaining of end face in hole;
Allow the center of circle of X-axis by measured circle;
Automatically generate Y-axis according to established Z axle, X-axis and true origin, promptly form fixing space coordinates;
(2) by the program setting of three coordinate machine, allow the three-dimensional probe move, respectively two terminal A of detection aperture along X-direction
1Point and B
1Point calculates connection A
1And B
1Distance, be the diameter of hole at directions X.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2005100571649A CN1737495A (en) | 2005-07-12 | 2005-07-12 | Method for measuring bore diameter with fixed direction utilizing three coordinate measuring machine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2005100571649A CN1737495A (en) | 2005-07-12 | 2005-07-12 | Method for measuring bore diameter with fixed direction utilizing three coordinate measuring machine |
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| CN1737495A true CN1737495A (en) | 2006-02-22 |
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| CNA2005100571649A Pending CN1737495A (en) | 2005-07-12 | 2005-07-12 | Method for measuring bore diameter with fixed direction utilizing three coordinate measuring machine |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101520296B (en) * | 2008-12-30 | 2011-12-28 | 惠阳航空螺旋桨有限责任公司 | Three-coordinate measuring method for circumferential uniformly-distributed hole true position error |
| CN102878968A (en) * | 2012-09-20 | 2013-01-16 | 湖北三江航天险峰电子信息有限公司 | Online measurement method for measuring size of large deep blind hole |
| US8417370B2 (en) | 2003-10-17 | 2013-04-09 | Hexagon Metrology Ab | Apparatus and method for dimensional metrology |
| CN104279971A (en) * | 2014-10-20 | 2015-01-14 | 贵阳新天光电科技有限公司 | Bi-chord method for measuring diameter of cylinder hole through electric eye measuring device of universal length measuring gauge |
| CN105910563A (en) * | 2016-03-31 | 2016-08-31 | 刘玉芳 | Three-coordinate measuring machine workpiece continuous measurement method |
| CN107003105A (en) * | 2014-12-15 | 2017-08-01 | 德马吉森精机株式会社 | Contact chorograph and the assay method using the chorograph |
| CN108469222A (en) * | 2016-11-23 | 2018-08-31 | 哈尔滨飞机工业集团有限责任公司 | A kind of detection method of tooling through-hole |
| CN113983991A (en) * | 2021-10-11 | 2022-01-28 | 中国航发南方工业有限公司 | Blade tip arc measuring method of radial diffuser |
-
2005
- 2005-07-12 CN CNA2005100571649A patent/CN1737495A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8417370B2 (en) | 2003-10-17 | 2013-04-09 | Hexagon Metrology Ab | Apparatus and method for dimensional metrology |
| US8825192B2 (en) | 2003-10-17 | 2014-09-02 | Hexagon Metrology Ab | Apparatus and method for dimensional metrology |
| CN101520296B (en) * | 2008-12-30 | 2011-12-28 | 惠阳航空螺旋桨有限责任公司 | Three-coordinate measuring method for circumferential uniformly-distributed hole true position error |
| CN102878968A (en) * | 2012-09-20 | 2013-01-16 | 湖北三江航天险峰电子信息有限公司 | Online measurement method for measuring size of large deep blind hole |
| CN104279971A (en) * | 2014-10-20 | 2015-01-14 | 贵阳新天光电科技有限公司 | Bi-chord method for measuring diameter of cylinder hole through electric eye measuring device of universal length measuring gauge |
| CN107003105A (en) * | 2014-12-15 | 2017-08-01 | 德马吉森精机株式会社 | Contact chorograph and the assay method using the chorograph |
| CN107003105B (en) * | 2014-12-15 | 2020-02-18 | 德马吉森精机株式会社 | Contact position measuring device and measuring method using the same |
| CN105910563A (en) * | 2016-03-31 | 2016-08-31 | 刘玉芳 | Three-coordinate measuring machine workpiece continuous measurement method |
| CN105910563B (en) * | 2016-03-31 | 2018-07-31 | 刘玉芳 | A kind of three coordinate measuring machine workpiece method for continuous measuring |
| CN108469222A (en) * | 2016-11-23 | 2018-08-31 | 哈尔滨飞机工业集团有限责任公司 | A kind of detection method of tooling through-hole |
| CN113983991A (en) * | 2021-10-11 | 2022-01-28 | 中国航发南方工业有限公司 | Blade tip arc measuring method of radial diffuser |
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