CN104061897A - Large split type nut column coplanarity detection method - Google Patents
Large split type nut column coplanarity detection method Download PDFInfo
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- CN104061897A CN104061897A CN201410326801.7A CN201410326801A CN104061897A CN 104061897 A CN104061897 A CN 104061897A CN 201410326801 A CN201410326801 A CN 201410326801A CN 104061897 A CN104061897 A CN 104061897A
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Abstract
The invention relates to the detection technology for large irregular curved surfaces and discloses a large split type nut column coplanarity detection method. The coplanarity of a split nut column is detected accurately and effectively. The method comprises the steps that measuring bases are set, a nut column workpiece unified coordinate system is built, points on the corresponding spiral surfaces of threaded elements on the left side and the right side are collected under the unified coordinate system through the scanning function of measuring equipment, three-dimensional coordinate values of feature points on the detected spiral surfaces are obtained, preprocessing is carried out on the three-dimensional coordinate values, an actual spiral surface is constructed through three-dimensional modeling software, and the coplanarity of each single spiral surface and the coplanarity of the split type nut column are calculated according to the actual threaded surfaces and the standard threaded surfaces. The method is applicable to coplanarity detection on large irregular curved surfaces.
Description
Technical field
The present invention relates to the detection technique of large-scale antarafacial curved surface, specifically, relate to a kind of large-scale Separated nut post coplane degree detection method.
Background technology
For the screw thread of stock size, carrying out after entirety processing, affect that screw thread screws, the major parameter of fit quality is: central diameter, pitch, half of thread angle, this class workpiece is in the time detecting, and requirement equally distributed four positions on circumference are detected conventionally.And for large-scale nut workpiece (as: Three-Gorges Ship-lift Nut column), due to working ability restriction, be typically designed to split typely, process is pressed parts processing, after many nut pieces are combined by web member, fixture, then form integral nut.For this large-scale nut workpiece, except ensureing the crudy of single-piece nut sheet, more importantly ensure after combination the mutual alignment between each nut and the coplane degree of flank of thread.
With the example that is assemblied into of Three-Gorges Ship-lift Nut column, in factory, adopt horizontal assembled mode, every batch participates in assembled Nut column is 3 joints, totally 6 nut sheets (screw element), as shown in Figure 1,6 nut sheets be combined as a segment length for approximately 15 meters, path be that 1.365 meters, pitch are the Nut column of 0.45 meter; For enhancing productivity and crudy, every screw element all adopts identical structure and size, and the pitch parameter of monolithic screw element can be used the equipment such as three coordinate measuring machine to detect.When combination, the screw element of arranged on left and right sides reference position in the longitudinal direction need be missed the length (0.225 meter) of 1/2 pitch, for ensureing installation accuracy, has all designed reference field 1, benchmark 2 on every side screw element.When installation, first the flatness that respectively the right and left 3 is saved to nut sheet reference field 1 is adjusted to requirement, reference position is differed to 0.225 meter again, ensure that inclined-plane 1 and 4 is coplanar, inclined-plane 2 and 3 is coplanar, after the axis coaxle degree adjustment of tooth top garden completes, need to carry out the detection of helicoid coplane degree and internode pitch.
In conventional art, also do not have a kind of effectively detection mode to detect Separated nut post coplane degree.
Summary of the invention
Technical matters to be solved by this invention is: propose a kind of large-scale Separated nut post coplane degree detection method, the coplane degree of Separated nut post is carried out to accurate and effective detection.
The technical scheme that technical solution problem of the present invention adopts is: large-scale Separated nut post coplane degree detection method, comprises the steps:
A, reference field 1, benchmark 2, reference field 3 are set respectively on the screw element of the left and right sides of Separated nut post, the side benchmark that described reference field 1 is one-sided screw element, the tip cylinder axial reference that described benchmark 2 is one-sided screw element, the end standard that described reference field 3 is one-sided screw element;
B, set up Nut column workpiece unified coordinate system: on the benchmark 2 of left and right sides screw element, adopt a little respectively, use Survey Software matching to obtain Nut column tip cylinder axis, and the first axle using this as unified coordinate system; On the reference field 1 of left side or right side screw element, adopt a little, use Survey Software fit Plane, and the second axle using the normal of this plane as unified coordinate system, the initial point of coordinate system is based upon on the intersection point of Nut column tip cylinder axis and reference field 3;
The scan function of c, use measuring equipment is adopted a little helicoid corresponding on the screw element of the left and right sides respectively under unified coordinate system, obtains the D coordinates value of unique point on tested helicoid;
D, the D coordinates value of the unique point obtaining is carried out to pre-service;
E, use 3 d modeling software are analyzed the pretreated D coordinates value of process, and are constructed the actual helicoid of screw element;
F, calculate single helicoid coplane degree: on single actual helicoid, choose maximal value measurement point and minimum value measurement point, described maximal value measurement point be on this actual helicoid compared with master screw face the point of protrusion degree maximum, described minimum value measurement point be on this actual helicoid compared with master screw face the point of sinking degree maximum; Calculate the difference A between corresponding point on maximal value measurement point and master screw face, the difference B on calculated minimum measurement point and master screw face between corresponding point, obtains the coplane degree of this helicoid by the difference between calculating A and B;
The coplane degree of g, calculating Nut column: all actual helicoids that construct are analyzed, in the maximal value measurement point of each actual helicoid, choose a maximal value C, and in the minimum value measurement point of each actual helicoid, choose a minimum value D, by calculating the coplane degree of the difference acquisition Nut column between C and D.
It should be noted that, A, the C in this programme be on the occasion of, C, D are negative value.
Further, in step c, described measuring equipment is laser scanner or white light scanning instrument.
Further, in steps d, describedly the D coordinates value of the unique point obtaining is carried out to pre-service comprise: the unique point obtaining is carried out to data pre-service by statistical method, reject and measure exceptional value.
The invention has the beneficial effects as follows: by measurement data acquisition and analyzing and processing, obtain the coplanar data of large-scale Separated nut post helicoid, can instruct the assembling of Nut column, ensure can correctly screw after Nut column assembling, technical indicator meets the requirements.
Brief description of the drawings
Fig. 1 is the Nut column schematic diagram that 6 nut sheets are combined into;
Fig. 2 is the coplane degree detection method process flow diagram in the present invention.
Embodiment
The present invention is intended to propose a kind of large-scale Separated nut post coplane degree detection method, and the coplane degree of Separated nut post is effectively detected.Below in conjunction with drawings and Examples, the solution of the present invention is further described.
To measure the Nut column coplane degree of Three-Gorges Ship-lift as example, because the screw thread surface of contact after assembled is space curved surface, Measurement accuracy coplane degree, must first obtain the real profile of screw thread surface of contact.For the measurement of real profile, be summed up as two kinds of modes of spot measurement and scanning survey, measure count number, will directly have influence on the precision of final profile, for the precision that ensures that real profile is measured, must select the equipment with continuous sweep measurement function to carry out cloud data collection.This kind equipment as: laser tracker scanning feeler, white light scanning, laser scanning, etc. equipment.Selecting of concrete equipment, consider size, the effective range (short measuring distances) of measuring equipment and the measuring accuracy of equipment of measurement space in Nut column.
As shown in Figure 2, it comprises following performing step to concrete metering system:
Step 1, measuring basis is set: reference field 1, benchmark 2, reference field 3 (referring to Fig. 1) are set respectively on the screw element of the left and right sides of Separated nut post, the side benchmark that described reference field 1 is one-sided screw element, the tip cylinder axial reference that described benchmark 2 is one-sided screw element, the end standard that described reference field 3 is one-sided screw element;
Step 2, set up Nut column workpiece unified coordinate system: on 6 Nut column tip cylinders (benchmark 2) of left and right sides screw element, adopt a little respectively, use Survey Software matching to obtain Nut column tip cylinder axis, and the first axle using this as unified coordinate system; On the reference field 1 of left side or right side screw element, adopt a little, use Survey Software fit Plane, and the second axle using the normal of this plane as unified coordinate system, the initial point of coordinate system is based upon on the intersection point of Nut column tip cylinder axis and reference field 3;
Step 3, use measuring equipment carry out data acquisition: use the scan function of measuring equipment, under unified coordinate system, respectively helicoid corresponding on the screw element of the left and right sides is adopted a little, obtain the D coordinates value of unique point on tested helicoid;
Step 4, D coordinates value is carried out to pre-service: for ensureing the accuracy of measurement data, the unique point obtaining can be carried out to data pre-service by statistical method, reject and measure exceptional value;
Step 5, structure actual thread face: utilize the 3 d modeling softwares such as geomegic, qualify, imageware, UG to carry out structure analysis, construct actual helicoid.
Step 6, calculate relevant parameter according to actual thread face and standard thread face:
Calculating about single helicoid coplane degree: choose maximal value measurement point and minimum value measurement point on single actual helicoid, described maximal value measurement point be on this actual helicoid compared with master screw face the point of protrusion degree maximum, described minimum value measurement point be on this actual helicoid compared with master screw face the point of sinking degree maximum; Calculate the difference A between corresponding point on maximal value measurement point and master screw face (by corresponding point comparison on the point of protrusion degree maximum on actual helicoid and master screw face, this fiducial value be one on the occasion of), difference B on calculated minimum measurement point and master screw face between corresponding point (compares by corresponding point on the point of sinking degree maximum on actual helicoid and master screw face, this fiducial value is a negative value), obtain the coplane degree of this helicoid by calculating difference between A and B;
Calculating about Nut column coplane degree: in global extent, all actual helicoids that construct are analyzed, in the maximal value measurement point of each actual helicoid, choose a maximal value C (this point be in all actual helicoids compared with the corresponding point of master screw face the point of protrusion degree maximum, the fiducial value that on this point and master screw face, corresponding point compare be also one on the occasion of), and in the minimum value measurement point of each actual helicoid, choose a minimum value D (this point be in all actual helicoids compared with the corresponding point of master screw face the point of sinking degree maximum, the fiducial value that on this point and master screw face, corresponding point compare is also a negative value), by calculating the coplane degree of the difference acquisition Nut column between C and D.
In addition, give the metering system of pitch in the application: the pitch of single-unit can be measured on the equipment such as three coordinate measuring machine, between splicing deutomerite, the measurement of pitch, because length dimension is large, can only be used portable set to measure.The calculating of internode pitch is to construct after actual helicoid at preceding method, according to the definition of pitch, in two adjacent joint pitch, chooses respectively two tooth forms by end, calculates central diameter cylinder, then calculates the axial distance of corresponding point-to-point transmission.
Claims (3)
1. large-scale Separated nut post coplane degree detection method, is characterized in that, comprises the steps:
A, reference field 1, benchmark 2, reference field 3 are set respectively on the screw element of the left and right sides of Separated nut post, the side benchmark that described reference field 1 is one-sided screw element, the tip cylinder axial reference that described benchmark 2 is one-sided screw element, the end standard that described reference field 3 is one-sided screw element;
B, set up Nut column workpiece unified coordinate system: on the benchmark 2 of left and right sides screw element, adopt a little respectively, use Survey Software matching to obtain Nut column tip cylinder axis, and the first axle using this as unified coordinate system; On the reference field 1 of left side or right side screw element, adopt a little, use Survey Software fit Plane, and the second axle using the normal of this plane as unified coordinate system, the initial point of coordinate system is based upon on the intersection point of Nut column tip cylinder axis and reference field 3;
The scan function of c, use measuring equipment is adopted a little helicoid corresponding on the screw element of the left and right sides respectively under unified coordinate system, obtains the D coordinates value of unique point on tested helicoid;
D, the D coordinates value of the unique point obtaining is carried out to pre-service;
E, use 3 d modeling software are analyzed the pretreated D coordinates value of process, and are constructed the actual helicoid of screw element;
F, calculate single helicoid coplane degree: on single actual helicoid, choose maximal value measurement point and minimum value measurement point, described maximal value measurement point be on this actual helicoid compared with master screw face the point of protrusion degree maximum, described minimum value measurement point be on this actual helicoid compared with master screw face the point of sinking degree maximum; Calculate the difference A between corresponding point on maximal value measurement point and master screw face, the difference B on calculated minimum measurement point and master screw face between corresponding point, obtains the coplane degree of this helicoid by the difference between calculating A and B;
The coplane degree of g, calculating Nut column: all actual helicoids that construct are analyzed, in the maximal value measurement point of each actual helicoid, choose a maximal value C, and in the minimum value measurement point of each actual helicoid, choose a minimum value D, by calculating the coplane degree of the difference acquisition Nut column between C and D.
2. large-scale Separated nut post coplane degree detection method as claimed in claim 1, is characterized in that, in step c, described measuring equipment is laser scanner or white light scanning instrument.
3. large-scale Separated nut post coplane degree detection method as claimed in claim 1 or 2, it is characterized in that, in steps d, describedly the D coordinates value of the unique point obtaining is carried out to pre-service comprise: the unique point obtaining is carried out to data pre-service by statistical method, reject and measure exceptional value.
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| CN201410326801.7A CN104061897B (en) | 2014-07-10 | 2014-07-10 | Large split type nut column coplanarity detection method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104480925A (en) * | 2014-12-25 | 2015-04-01 | 二重集团（德阳）重型装备股份有限公司 | Horizontal-type trial assembly method used for heavy tile-type nut post |
| CN112833831A (en) * | 2020-12-31 | 2021-05-25 | 中国航发长春控制科技有限公司 | Coplanarity parameter detection method |
| CN114739327A (en) * | 2022-03-24 | 2022-07-12 | 中国科学院光电技术研究所 | Method for detecting coplanarity of eight spliced mirrors |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102252644A (en) * | 2010-04-29 | 2011-11-23 | 霍梅尔-埃塔米克有限公司 | Method for determining helical structure |
| CN102967291A (en) * | 2012-12-07 | 2013-03-13 | 东莞生益电子有限公司 | Measuring method of coplanarity of surface of circuit board |
| CN103643667A (en) * | 2013-12-23 | 2014-03-19 | 中国葛洲坝集团股份有限公司 | Ship lift nut column installation auxiliary adjustment method |
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2014
- 2014-07-10 CN CN201410326801.7A patent/CN104061897B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102252644A (en) * | 2010-04-29 | 2011-11-23 | 霍梅尔-埃塔米克有限公司 | Method for determining helical structure |
| CN102967291A (en) * | 2012-12-07 | 2013-03-13 | 东莞生益电子有限公司 | Measuring method of coplanarity of surface of circuit board |
| CN103643667A (en) * | 2013-12-23 | 2014-03-19 | 中国葛洲坝集团股份有限公司 | Ship lift nut column installation auxiliary adjustment method |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104480925A (en) * | 2014-12-25 | 2015-04-01 | 二重集团（德阳）重型装备股份有限公司 | Horizontal-type trial assembly method used for heavy tile-type nut post |
| CN112833831A (en) * | 2020-12-31 | 2021-05-25 | 中国航发长春控制科技有限公司 | Coplanarity parameter detection method |
| CN114739327A (en) * | 2022-03-24 | 2022-07-12 | 中国科学院光电技术研究所 | Method for detecting coplanarity of eight spliced mirrors |
| CN114739327B (en) * | 2022-03-24 | 2022-12-30 | 中国科学院光电技术研究所 | Method for detecting coplanarity of eight spliced mirrors |
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Inventor after: Shi Sucun Inventor after: Wu Xiaoyun Inventor after: Duan Ling Inventor after: Shi Sucun, Wu Xiaoyun, Duan Ling, Shi Xiaobing Inventor before: Shi Sucun Inventor before: Wu Xiaoyun Inventor before: Duan Ling Inventor before: Shi Sucun, Wu Xiaoyun, Duan Ling, Shi Xiaobing |
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Effective date of registration: 20180712 Address after: 618013 No. 460 Zhujiang West Road, Sichuan, Deyang Co-patentee after: Three Gorges mechanical and Electrical Engineering Technology Co., Ltd. Patentee after: Double (Deyang) heavy equipment Co., Ltd. Address before: 618013 No. 460 Zhujiang West Road, Sichuan, Deyang Co-patentee before: China Three Gorges Corporation Patentee before: Erzhong Group (Deyang) Heavy Equipment Co., Ltd. |