CN102661699A - Precision measurement method of large-radius short arc part - Google Patents
Precision measurement method of large-radius short arc part Download PDFInfo
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- CN102661699A CN102661699A CN2012101491340A CN201210149134A CN102661699A CN 102661699 A CN102661699 A CN 102661699A CN 2012101491340 A CN2012101491340 A CN 2012101491340A CN 201210149134 A CN201210149134 A CN 201210149134A CN 102661699 A CN102661699 A CN 102661699A
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Abstract
The invention discloses a precision measurement method of a large-radius short arc part. The method comprises the following steps of: pre-determining the theoretical center of a circle of an arc of the short arc part to be measured, then selecting 2-20 sampling points on the arc, getting radius values obtained by connecting all the sampling points to the theoretical center of the circle of the arc and then averaging to get an actual radius value of the arc; or firstly selecting 3-20 sampling points on the arc of the short arc part to be measured, and enabling the sampling points to be in two-two connection, wherein the intersection point of perpendicular bisectors of obtained chord length sections is of the center of the circle of the arc, and the distance from each sampling point to the center of the circle is of the actual radius value of the arc. According to the precision measurement method disclosed by the invention, measurement error is small, the accuracy and the degree of confidence of the measured value of the short arc large-radius part are improved, the difficult problem of precision measurement of the large-radius short arc part in the prior art can be solved, and the precision measurement method can be popularized to the precision measurement of complex special-shaped surfaces.
Description
Technical field
The present invention relates to a kind of measuring method of circular arc part, particularly a kind of central angle belongs to the Measuring and testing technical field less than 30 ° short circular arc long radius machine parts'precise measuring method.
Background technology
The parts great majority of engine combustion part all are round shapes; And majority all is by a synthetic integral body of many set of tiles; And the arc surface of each fritter has wherein just formed the short circular arc of long radius, and the arc surface majority is a machining benchmark in process, and whether the positioning reference on the frock accurately will directly have influence on the crudy of product; Therefore need measure the center of the short circular arc of check and the radius R value of short circular arc to short circular arc.So-called short circular arc, be meant less than 30 degree central angles right circular arc.At present; The measuring technique of the short circular arc of long radius is an internationally recognized technical barrier; Receive factor affecting such as uncertainty and the sample range of the inherent error of surveying instrument, measured technological equipment deviation, tested benchmark is little, short circular arc can't detect actual value with the method for common measurement circle.In the actual detected process; Light gap method (limit gauge method) commonly used and two kinds of methods of the high chord length method of bow are measured; But there is following drawback in these two kinds of methods: (1) light gap method is the gap through visual inspection part and model; Cause error bigger, use for the measurement significant discomfort of accurate circular arc.(2) the high chord length method of bow is a diameter of use the bow height of measuring circular arc and chord length to calculate circular arc; Yet when the bow height is too small or excessive than chord length; Sample range is restricted, and bending high measuring error will be big more, finally causes the measured value error of accurate circular arc also big more.Depart from when big when given theoretical parameter and actual simultaneously, measurement effect just significantly descends, and this moment, the degree of confidence of measurement result also descended thereupon.
Summary of the invention
Technical matters to be solved by this invention is to provide the short circular arc machine parts'precise of a kind of long radius measuring method.This method can improve the accuracy and the degree of confidence of the long radius part measured value of short circular arc, thereby overcomes the deficiency of above-mentioned prior art.
For solving the problems of the technologies described above, the present invention adopts following technical scheme: the short circular arc machine parts'precise of long radius measuring method.This method is to adopt to preset the center of circle and the radius that theoretical central coordinate of circle method or chord length perpendicular bisector method are confirmed circular arc; It is described that to preset theoretical central coordinate of circle method be to confirm the theoretical center of circle of circular arc of short circular arc part to be measured in advance; On circular arc, choose 2～20 sampled points then, each sampled point is connected to the real radius value that the resulting radius value in the theoretical center of circle of circular arc is averaged and is this circular arc; Described chord length perpendicular bisector method is on the circular arc of short circular arc part to be measured, to choose earlier 3～20 sampled points; Sampled point is connected in twos; The perpendicular bisector intersection point of gained chord length section is the center of circle of this circular arc, and the distance in sampled point to the center of circle is the real radius value of circular arc.
In the short circular arc machine parts'precise of the above-mentioned long radius measuring method, specifically, describedly preset theoretical central coordinate of circle method and may further comprise the steps:
(1), according to pattern technical requirement and part actual conditions, detect the theoretical center of circle of circular arc of short circular arc part to be measured in advance;
(2), on circular arc, choose 2～20 sampled points, each sampled point is connected to the theoretical center of circle of circular arc, obtain a plurality of radius values;
(3), with a plurality of radius value calculating mean values that each sampled point records, its result is the real radius value of circular arc;
(4), actual measurement circular arc figure is drawn out in the circular arc real radius value and the theoretical center of circle of circular arc that obtain according to said method;
(5), according to the detail of design size tolerance requirements of short circular arc part, draw out a theoretical maximum radius value circular arc figure and a theoretical least radius value circular arc figure;
(6), the actual measurement circular arc figure of step (4) being drawn carries out overlapping with the circular arc figure of two theoretical limit radius values of step (5) drafting; If actual measurement circular arc figure is in two theoretical limit circular arc figure scopes, then measured circular arc is qualified.
In the short circular arc machine parts'precise of the aforesaid long radius measuring method, specifically, described chord length perpendicular bisector method may further comprise the steps:
(1), on the circular cross-section of short circular arc part to be measured, chooses 3～20 sampled points;
(2), sampled point is connected in twos, obtain a plurality of chord length sections;
(3), on each bar chord length section, draw out its perpendicular bisector, obtain many perpendicular bisectors;
(4), confirm the intersection point of per two perpendicular bisectors, and obtain the average of many perpendicular bisectors through the Gauss feature group, this average is the central coordinate of circle of circular arc, the distance in sampled point to the center of circle is the real radius value of circular arc;
(5), the circular arc real radius value that obtains according to said method and the central coordinate of circle of circular arc are drawn out actual measurement circular arc figure;
(6), according to the detail of design size tolerance requirements of short circular arc part, draw out a theoretical maximum radius value circular arc figure and a theoretical least radius value circular arc figure;
(7), the circular arc figure with the actual measurement circular arc figure of drawing in the step (5) and two theoretical limit radius values of step (6) drafting carries out overlapping seeing; If actual measurement circular arc figure is in the circular arc figure scope of two theoretical limit radius values, then measured circular arc is qualified.
Beneficial effect of the present invention: compared with prior art; Measuring error of the present invention is less; Improved accuracy and the degree of confidence of central angle, solved in the prior art a precision measurement difficult problem the short circular arc part of long radius less than 30 ° short circular arc long radius part measured value.The present invention extends to the accurate measurement of complicated abnormal shape face.
Description of drawings
Fig. 1 is the theoretical central coordinate of circle method schematic diagram that presets of the present invention;
Fig. 2 is a chord length perpendicular bisector method schematic diagram of the present invention;
Whether qualified Fig. 3 estimate measured circular arc drawing of tolerance range;
Fig. 4 is the error analysis figure of model 6060-0007 among the embodiment 1;
Fig. 5 is the error analysis figure of frock B2 Φ 60842-1486 among the embodiment 1.
Below in conjunction with accompanying drawing and embodiment the present invention is further described.
Embodiment
Embodiment 1.The center of circle and the radius (being applicable to when the central coordinate of circle machining precision is higher) that theoretical central coordinate of circle method is confirmed circular arc preset in employing.This method is to confirm the theoretical center of circle of circular arc of short circular arc part to be measured in advance; On circular arc, choose 2～20 sampled points then; Respectively each sampled point is connected to the theoretical center of circle of circular arc, obtains a plurality of radius values, a plurality of radius value calculating mean values are the real radius value of circular arc.
Concrete measuring process is following:
(1), according to pattern technical requirement and part actual conditions, detect the theoretical central coordinate of circle of circular arc (x ', y ') of short circular arc part to be measured in advance through other upper reference, as shown in Figure 1;
(2), on circular arc, choose 2～20 sampled points (sampled point quantity according to circular arc true form confirm), and respectively each sampled point is connected to the theoretical center of circle of circular arc, obtain a plurality of radius value R;
(3), with a plurality of radius value calculating mean values that each sampled point records, its result is the real radius value R of circular arc
Real
(4), actual measurement circular arc figure (R is drawn out in the circular arc real radius value and the theoretical center of circle of circular arc that obtain according to said method
Real), as shown in Figure 3;
(5), according to the detail of design size tolerance requirements of short circular arc part, draw out a theoretical maximum radius value circular arc figure (R
Maximum) and a theoretical least radius value circular arc figure (R
Minimum);
(6), the actual measurement circular arc figure (R that step (4) is drawn
Real) the circular arc figure (R of two theoretical limit radius values drawing with step (5)
Maximum), (R
Minimum) carry out overlappingly, if actual measurement circular arc figure is in two theoretical limit circular arc figure scopes, then measured short circular arc part is qualified.
Above-mentioned measuring method is good more to the high more parts measurement effect of machining precision, and when given theoretical parameter and actual departs from when big, measurement effect just significantly descends, and this moment, the degree of confidence of measurement result must be decided according to the size of the given tolerance of pattern.Otherwise, will handle again data measured, its method is the suitable theoretical center of arc of adjustment position in the given margin tolerance of pattern, sees the variation of its former measure R value, and is qualified if both all just are regarded as in margin tolerance.
For verifying the feasibility of this method, the applicant adopts the frock of our factory and model to measure with top method, and its result is following:
Data analysis and the processing of table 1 model 6060-0007:
The error analysis of model 6060-0007 is as shown in Figure 4, and R195.03 is theoretical maximum radius value circular arc figure among the figure, and R194.97 is theoretical least radius value circular arc figure.
Table 2 frock B
2Φ 60842-1486 data analysis and processing:
The error analysis of frock B2 Φ 60842-1486 is as shown in Figure 5, and R294.600 is theoretical maximum radius value circular arc figure among the figure, and R294.500 is theoretical least radius value circular arc figure.
The radius that can be obtained model 6060-0007 by top measurement result is R195.016 ± 0.004mm, and the radius of frock B2 Φ 60842-1486 is R294.024 ± 0.0148mm, meets Design Requirement Drawing.
Embodiment 2.Adopt described chord length perpendicular bisector method to confirm the center of circle and the radius of circular arc (be applicable to have only a bit of circular arc, can't given in advance central coordinate of circle or the situation of radius value).Theorem according to circle: the vertical line of string of circle must be crossed the center of circle, does not have the vertical line of several strings and all crosses the center of circle, and their intersection point must be exactly the center of circle so.This method is on the circular arc of short circular arc part to be measured, to choose 3～20 sampled points earlier, and sampled point is connected in twos, obtains a plurality of chord length sections, and the intersection point of the perpendicular bisector of a plurality of chord length sections is the center of circle of circular arc, and the distance in sampled point to the center of circle is the radius value of circular arc.
Concrete measuring process is following:
(1), on the circular cross-section of short circular arc part to be measured, chooses 3～20 sampled points (sampled point quantity is confirmed according to the circular arc true form); As shown in Figure 2.
(2), sampled point is connected in twos, obtain a plurality of chord length section L;
(3), on each bar chord length section, draw out its perpendicular bisector, obtain many perpendicular bisector M;
(4), confirm the intersection point of per two perpendicular bisectors, and obtain the average of many perpendicular bisectors through the Gauss feature group, this average is the central coordinate of circle of circular arc, the distance in sampled point to the center of circle is the real radius value R of circular arc;
(5), the circular arc real radius value that obtains according to said method and the central coordinate of circle of circular arc are drawn out actual measurement circular arc figure;
(6), according to the detail of design size tolerance requirements of short circular arc part, draw out a theoretical maximum radius value circular arc figure and a theoretical least radius value circular arc figure;
(7), the circular arc figure with the actual measurement circular arc figure of drawing in the step (5) and two theoretical limit radius values of step (6) drafting carries out overlapping seeing; If actual measurement circular arc figure is in the circular arc figure scope of two theoretical limit radius values, then measured short circular arc part is qualified.
In this method, the sampled point of on short circular arc, getting is many more, can obtain the intersection point of many more perpendicular bisectors like this, and accuracy of measurement is just more near actual value.
Embodiment of the present invention is not limited to the foregoing description, and the various variations of under the prerequisite that does not break away from aim of the present invention, making all belong within protection scope of the present invention.
Claims (3)
1. a long radius is lacked circular arc machine parts'precise measuring method; It is characterized in that: its adopts and to preset the center of circle and the radius that theoretical central coordinate of circle method or chord length perpendicular bisector method are confirmed circular arc; It is described that to preset theoretical central coordinate of circle method be to confirm the theoretical center of circle of circular arc of short circular arc part to be measured in advance; On circular arc, choose 2～20 sampled points then, each sampled point is connected to the real radius value that the resulting radius value in the theoretical center of circle of circular arc is averaged and is this circular arc; Described chord length perpendicular bisector method is on the circular arc of short circular arc part to be measured, to choose earlier 3～20 sampled points; Sampled point is connected in twos; The perpendicular bisector intersection point of gained chord length section is the center of circle of this circular arc, and the distance in sampled point to the center of circle is the real radius value of circular arc.
2. the short circular arc machine parts'precise of long radius according to claim 1 measuring method is characterized in that: describedly preset theoretical central coordinate of circle method and may further comprise the steps:
(1), according to pattern technical requirement and part actual conditions, detect the theoretical center of circle of circular arc of short circular arc part to be measured in advance;
(2), on circular arc, choose 2～20 sampled points, respectively each sampled point is connected to the theoretical center of circle of circular arc, obtain a plurality of radius values;
(3), with a plurality of radius value calculating mean values that each sampled point records, its result is the real radius value of circular arc;
(4), actual measurement circular arc figure is drawn out in the circular arc real radius value and the theoretical center of circle of circular arc that obtain according to said method;
(5), according to the detail of design size tolerance requirements of short circular arc part, draw out a theoretical maximum radius value circular arc figure and a theoretical least radius value circular arc figure;
(6), the actual measurement circular arc figure of step (4) being drawn carries out overlapping with the circular arc figure of two theoretical limit radius values of step (5) drafting; If actual measurement circular arc figure is in two theoretical limit circular arc figure scopes, then measured circular arc is qualified.
3. the short circular arc machine parts'precise of long radius according to claim 1 measuring method, it is characterized in that: described chord length perpendicular bisector method may further comprise the steps:
(1), on the circular cross-section of short circular arc part to be measured, chooses 3～20 sampled points;
(2), sampled point is connected in twos, obtain a plurality of chord length sections;
(3), on each bar chord length section, draw out its perpendicular bisector, obtain many perpendicular bisectors;
(4), confirm the intersection point of per two perpendicular bisectors, and obtain the average of many perpendicular bisectors through the Gauss feature group, this average is the central coordinate of circle of circular arc, the distance in sampled point to the center of circle is the real radius value of circular arc;
(5), the circular arc real radius value that obtains according to said method and the central coordinate of circle of circular arc are drawn out actual measurement circular arc figure;
(6), according to the detail of design size tolerance requirements of short circular arc part, draw out a theoretical maximum radius value circular arc figure and a theoretical least radius value circular arc figure;
(7), the circular arc figure with the actual measurement circular arc figure of drawing in the step (5) and two theoretical limit radius values of step (6) drafting carries out overlapping seeing; If actual measurement circular arc figure is in the circular arc figure scope of two theoretical limit radius values, then measured circular arc is qualified.
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| CN103148840A (en) * | 2013-01-23 | 2013-06-12 | 哈尔滨工业大学 | Extraction method of barycentric coordinate of earth ultraviolet image |
| CN103234432A (en) * | 2013-04-25 | 2013-08-07 | 上海核工程研究设计院 | Center-free arc bending radius measuring ruler and bend pipe bending radius measuring method |
| TWI475422B (en) * | 2012-10-31 | 2015-03-01 | Wistron Corp | Method for recognizing gesture and electronic device |
| CN104501727A (en) * | 2014-12-17 | 2015-04-08 | 重庆望江工业有限公司 | Measurement method of short circular-arc radius sample plate |
| CN104729450A (en) * | 2013-12-18 | 2015-06-24 | 上海宝钢工业技术服务有限公司 | Method for detecting accuracy of arc alignment of continuous casting segments |
| CN105363833A (en) * | 2015-12-02 | 2016-03-02 | 中国石油集团渤海石油装备制造有限公司 | Online detecting method for pre-bending process of straight seam steel pipe |
| CN106091958A (en) * | 2016-05-30 | 2016-11-09 | 兰州兰石集团有限公司 | The method measuring circular arc works radius based on arc height chord length method |
| CN108332640A (en) * | 2017-12-08 | 2018-07-27 | 西安飞机工业（集团）有限责任公司 | A kind of aircraft door arc surface error detection method |
| CN109839084A (en) * | 2019-01-25 | 2019-06-04 | 国家电网有限公司 | A kind of turning radius detection device of high voltage single-core cable, system and method |
| CN110849291A (en) * | 2019-11-26 | 2020-02-28 | 二重（德阳）重型装备有限公司 | Method for detecting bending radius of large-scale bent pipe |
| CN111044004A (en) * | 2019-12-30 | 2020-04-21 | 广东联塑科技实业有限公司 | Pipeline surface smoothness detection method |
| CN112325782A (en) * | 2020-10-30 | 2021-02-05 | 太原科技大学 | Method and device for measuring radius of arc-shaped workpiece in real time |
| CN112344866A (en) * | 2020-02-11 | 2021-02-09 | 周海兵 | Automatic detection device for U-shaped copper pipe of air conditioner |
| CN114136251A (en) * | 2021-11-24 | 2022-03-04 | 中国航发贵州黎阳航空动力有限公司 | Method for detecting special size of cylindrical surface part with large radius and small proportion |
| CN114353721A (en) * | 2021-10-29 | 2022-04-15 | 中国航发西安动力控制科技有限公司 | Method for precisely measuring diameter of large-radius small-arc molded surface by using formula method |
| CN114543727A (en) * | 2020-11-27 | 2022-05-27 | 无锡塔尔基热交换器科技有限公司 | Method for measuring radius of small circular arc |
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| CN103148840A (en) * | 2013-01-23 | 2013-06-12 | 哈尔滨工业大学 | Extraction method of barycentric coordinate of earth ultraviolet image |
| CN103234432A (en) * | 2013-04-25 | 2013-08-07 | 上海核工程研究设计院 | Center-free arc bending radius measuring ruler and bend pipe bending radius measuring method |
| CN104729450A (en) * | 2013-12-18 | 2015-06-24 | 上海宝钢工业技术服务有限公司 | Method for detecting accuracy of arc alignment of continuous casting segments |
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| CN112344866B (en) * | 2020-02-11 | 2022-04-26 | 临沂市交通制冷工程有限公司 | Automatic detection device for U-shaped copper pipe of air conditioner |
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Application publication date: 20120912 |