CN110954041B - Calibration method of three-dimensional thread measuring instrument - Google Patents
Calibration method of three-dimensional thread measuring instrument Download PDFInfo
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- CN110954041B CN110954041B CN201911355705.4A CN201911355705A CN110954041B CN 110954041 B CN110954041 B CN 110954041B CN 201911355705 A CN201911355705 A CN 201911355705A CN 110954041 B CN110954041 B CN 110954041B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
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- A Measuring Device Byusing Mechanical Method (AREA)
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Abstract
The invention discloses a calibration method of a three-dimensional thread measuring instrument, which comprises the following steps: s1, processing an annular band with a thread form with an angle of 60 degrees on a cylinder; s2, further processing at least six toothed belts on the cylinder to obtain a thread-like standard device, wherein the toothed belts extend along the axial direction; and S3, measuring the similar thread standard device through the coordinate measuring device and the three-dimensional thread measuring instrument respectively, and calibrating the three-dimensional thread measuring instrument by comparing the data measured by the three-dimensional thread measuring instrument with the data measured by the coordinate measuring device. According to the invention, the screw thread-like standard is designed, the coordinate measuring device and the three-dimensional screw thread measuring instrument are respectively used for measuring the screw thread-like standard, and the data measured by the three-dimensional screw thread measuring instrument is compared with the data measured by the coordinate measuring device, so that the calibration of the three-dimensional screw thread measuring instrument is realized.
Description
Technical Field
The invention relates to the technical field of three-dimensional thread measurement, in particular to a calibration method of a three-dimensional thread measuring instrument.
Background
With the improvement of the screw standardization system and the improvement of the processing level, the detection requirements on the screw are gradually expanded from the detection in various aspects such as the rotatability and the interchangeability to the detection in various aspects such as the strength, the reliability, the sealing performance and the like, and the comprehensive detection of the multiple parameters of the screw is more and more widely accepted.
The thread parameters mainly comprise parameters such as thread pitch, major diameter, minor diameter, thread form angle, cone angle and the like. International thread measuring technology has been tracked in China, a thread comprehensive measuring instrument adopting a two-dimensional measuring technology is developed to replace one-dimensional measuring instruments such as a length measuring instrument and the like, and the quality improvement of thread products is promoted. However, two-dimensional thread measurement techniques clearly suffer from the inherent drawbacks of single axis cross-sectional scanning. The three-dimensional thread measuring instrument can obtain the real and comprehensive geometric information of the measured thread, can generate great promotion effect on the manufacture of the threads in China, and is beneficial to improving the situation that the high-end threads in China seriously depend on imports. The three-dimensional thread scanner which is being developed in China is a brand-new instrument, the instrument adopts an ultra-precise cylindrical coordinate three-dimensional helicoid scanning measurement technology, three-dimensional thread morphology curved surfaces are accurately reconstructed and comprehensive geometric parameters are accurately extracted by collecting three-dimensional space point cloud data, and wide-range full-parameter high-precision measurement of internal and external threads is realized. At present, relevant calibration methods are available at home and abroad.
Disclosure of Invention
The invention aims to provide a calibration method of a three-dimensional thread measuring instrument, which provides a detection technology support for domestic high-end thread manufacturing and realizes the uniformity of thread measurement values.
In order to achieve the purpose, the invention provides the following scheme:
the invention discloses a calibration method of a three-dimensional thread measuring instrument, which comprises the following steps:
s1, processing an annular band with a thread form with an angle of 60 degrees on a cylinder;
s2, further processing at least six toothed belts on the cylinder to obtain a thread-like standard device, wherein the toothed belts extend along the axial direction;
and S3, measuring the similar thread standard device through a coordinate measuring device and a three-dimensional thread measuring instrument respectively, and calibrating the three-dimensional thread measuring instrument by comparing data measured by the three-dimensional thread measuring instrument with data measured by the coordinate measuring device.
Preferably, the thread-like standard has an axial through hole therein.
Preferably, in step S1, the outer diameter of the annular band is 20mm, 56mm, 80mm or 100 mm.
Preferably, the dental tape in step S2 is 6 strips.
Compared with the prior art, the invention has the following technical effects:
according to the invention, the screw thread-like standard is designed, the coordinate measuring device and the three-dimensional screw thread measuring instrument are respectively used for measuring the screw thread-like standard, and the data measured by the three-dimensional screw thread measuring instrument is compared with the data measured by the coordinate measuring device, so that the calibration of the three-dimensional screw thread measuring instrument is realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a view showing the effect of the process of step 1;
FIG. 2 is a schematic diagram of a thread-like standard;
FIG. 3 is a flow chart of a calibration method of the three-dimensional thread measuring instrument according to the present invention;
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a calibration method of a three-dimensional thread measuring instrument, which provides a detection technology support for domestic high-end thread manufacturing and realizes the uniformity of thread measurement values.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
As shown in fig. 1 to 3, the present embodiment provides a calibration method for a three-dimensional thread measuring instrument, including the following steps:
s1, machining an annular band with a thread profile with an angle of 60 degrees on a cylinder (shown in figure 1);
s2, further processing a plurality of tooth-shaped belts on the cylindrical body to obtain a thread-like standard device, wherein the tooth-shaped belts extend along the axial direction (shown in figure 2);
and S3, measuring the similar thread standard device through the coordinate measuring device and the three-dimensional thread measuring instrument respectively, and calibrating the three-dimensional thread measuring instrument by comparing the data measured by the three-dimensional thread measuring instrument with the data measured by the coordinate measuring device.
The thread-like standard obtained through the steps has the characteristics of a thread gauge, does not have the helix angle of the thread gauge, is suitable for the measurement mode of a three-dimensional thread measuring instrument, and can calculate thread parameters such as thread pitch, pitch diameter, thread form angle and the like. Meanwhile, the standard is easy to be accurately measured by other instruments (such as coordinate measuring equipment and a three-dimensional thread measuring instrument); and the two are compared and analyzed, so that the tracing of the instrument is realized. The thread-like profile angle is a 60 ° profile angle commonly used for common metric threads. Since the extraction and comparison of feature data are common knowledge in the art, they are not described in detail herein.
In step S1, the outer diameter of the annular band is 20mm, 56mm, 80mm, 100mm or other common diameter dimensions, and the height and pitch of the thread form conform to GB/T196-. In this embodiment, the number of the toothed belts on the thread-like standard is 6, and those skilled in the art can select other numbers as needed.
Further, the screw-like standard of the present embodiment has an axial through hole (as shown in fig. 2), so that the weight of the screw-like standard is reduced while ensuring the measurement accuracy.
The principle and the implementation mode of the present invention are explained by applying specific examples in the present specification, and the above descriptions of the examples are only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (4)
1. A calibration method of a three-dimensional thread measuring instrument is characterized by comprising the following steps:
s1, processing an annular band with a thread form with an angle of 60 degrees on a cylinder;
s2, further processing at least six toothed belts on the cylinder to obtain a thread-like standard device, wherein the toothed belts extend along the axial direction;
and S3, measuring the similar thread standard device through a coordinate measuring device and a three-dimensional thread measuring instrument respectively, and calibrating the three-dimensional thread measuring instrument by comparing data measured by the three-dimensional thread measuring instrument with data measured by the coordinate measuring device.
2. The method of calibrating a three-dimensional thread measuring instrument according to claim 1, wherein the thread-like standard has an axial through hole therein.
3. The method for calibrating a three-dimensional thread measuring instrument according to claim 1, wherein in step S1, the outer diameter of the annular band is 20mm, 56mm, 80mm or 100 mm.
4. The method for calibrating a three-dimensional thread measuring instrument according to claim 1, wherein the toothed belt in step S2 is 6 strips.
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| CN201911355705.4A CN110954041B (en) | 2019-12-25 | 2019-12-25 | Calibration method of three-dimensional thread measuring instrument |
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| CN110954041B true CN110954041B (en) | 2021-09-24 |
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| CN112729039A (en) * | 2020-10-27 | 2021-04-30 | 天津市计量监督检测科学研究院 | Metering calibration method for thread gauge |
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| JP2006308709A (en) * | 2005-04-27 | 2006-11-09 | Tohoku Univ | Microscope stage, and focal position measuring instrument and confocal microscope system |
| DE102011001746A1 (en) * | 2011-04-01 | 2012-10-04 | Werth Messtechnik Gmbh | Device for representing independent test lengths in spatial directions for measuring and/or checking precision of multi-sensor coordinate measuring device, has test body with modular components, which are stacked or inserted into each other |
| DE102011050036B4 (en) * | 2011-05-02 | 2012-01-19 | Carl Mahr Holding Gmbh | Contour normal with rotationally symmetrical calibration range, use of the standard and method for calibrating and / or monitoring a contour measuring device |
| CN103134453B (en) * | 2013-01-30 | 2015-04-08 | 天津大学 | Measuring head calibration method of thread combined function dimensional measurement instrument |
| CN106092008B (en) * | 2016-06-28 | 2019-03-12 | 天津大学 | The coordinate unification calibration device and scaling method of high-accuracy composite type measuring machine |
| CN206378114U (en) * | 2016-12-28 | 2017-08-04 | 中国石油天然气集团公司 | A kind of thread roller measuring instrument calibrating installation |
| CN108050949B (en) * | 2017-12-05 | 2020-09-22 | 深圳市中图仪器股份有限公司 | Method for measuring three-dimensional pitch diameter and two-dimensional comprehensive parameters of threads |
| CN108489401B (en) * | 2018-05-23 | 2023-09-01 | 上海市计量测试技术研究院 | Split type calibration target, calibration device with target and calibration method of calibration device |
| CN109238197A (en) * | 2018-08-28 | 2019-01-18 | 北京大学口腔医学院 | A kind of Accuracy Assessment of oral cavity spatial digitizer |
| CN110230993B (en) * | 2019-07-11 | 2021-01-26 | 四川长虹电器股份有限公司 | Precision evaluation method of optical three-dimensional scanner |
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