CN112147143A - Anatomical measurement method for circular arc radius of common thread root - Google Patents
Anatomical measurement method for circular arc radius of common thread root Download PDFInfo
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- CN112147143A CN112147143A CN202011010518.5A CN202011010518A CN112147143A CN 112147143 A CN112147143 A CN 112147143A CN 202011010518 A CN202011010518 A CN 202011010518A CN 112147143 A CN112147143 A CN 112147143A
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- 238000000691 measurement method Methods 0.000 title claims abstract description 9
- 238000005259 measurement Methods 0.000 claims abstract description 9
- 238000010191 image analysis Methods 0.000 claims abstract description 4
- 238000005498 polishing Methods 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
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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
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/08—Measuring arrangements characterised by the use of optical techniques for measuring diameters
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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
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
- G01B11/2425—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures of screw-threads
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
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Abstract
The invention discloses an anatomical measurement method for the circular arc radius of a common thread root, which comprises the following steps: cutting the thread longitudinally through a common thread center line by using linear cutting equipment, and manufacturing a sample after coarse grinding, fine grinding and polishing the section; observing the radius of the circular arc of the thread root by using a proper multiple under a metallographic microscope and collecting an image, wherein the proper multiple is 50 times or 100 times; analyzing and measuring the collected image by using an OLYCIA m3 metallographic image analysis system, and measuring the radius of the circular arc of the thread root by using a round tool in the advanced image measurement; and respectively measuring the radii of a plurality of arcs existing in the tooth root, adjusting the arcs of the measuring circle to coincide with the arcs of the measured tooth root as much as possible, and obtaining the radius of the measuring circle, namely the radius of the arc of the common thread tooth root. Particularly, the radius of a plurality of circular arcs on the tooth bottom and the radius of the circular arc smaller than 0.30mm can be accurately measured.
Description
Technical Field
The invention belongs to the technical field of metal material detection, and particularly relates to an anatomical measurement method for the circular arc radius of a common thread root.
Background
The size of the circular arc radius of the common thread root directly influences the performance of a thread piece bearing fatigue and impact load and often becomes a main reason causing the fracture and failure of the thread piece, so that the circular arc radius of the common thread root needs to be accurately measured in the quality detection of sampling and dissecting of the thread piece. The requirement of the radius of the circular arc of the tooth bottom of the common thread is clearly specified in GB/T197-2018 common thread tolerance, and the radius of the circular arc at each part of the tooth bottom is not less than 0.125P (P is the thread pitch). Because the radius of the circular arc at the bottom of the thread is generally smaller (less than or equal to 0.30mm), the size of the circular arc radius smaller than 0.3mm cannot be measured quantitatively by adopting the traditional methods such as an R lens, a projector, a universal tool microscope, a radius gauge and the like; the radius of the arc cannot be measured quantitatively by the R lens and the projector; the universal tool microscope can only indirectly measure the sizes of some screw teeth and then calculate the size of the arc radius according to the triangular relation, and the size cannot be directly obtained and has larger error; the lower limit of the radius gauge measuring tool is 0.30mm, only the radius of the tooth bottom which is a circular arc can be measured, and the radius which is less than 0.30mm and has a plurality of circular arcs at the tooth bottom cannot be measured.
Disclosure of Invention
The invention aims to provide an anatomical measurement method for the circular arc radius of the common thread root, which can accurately measure the circular arc radius of the common thread root, thereby being beneficial to the quality judgment, failure reason analysis and responsibility determination of a threaded part.
The invention is realized by adopting the following technical scheme:
an anatomical measurement method for the radius of a circular arc of a common thread root comprises the following steps:
1) a common thread piece is longitudinally split by using linear cutting equipment, and a section is subjected to coarse grinding, fine grinding and polishing to prepare a test sample;
2) observing the radius of the circular arc of the thread root by a set multiple under a metallographic microscope and collecting images;
3) analyzing and measuring the collected image by using an OLYCIA m3 metallographic image analysis system, and measuring the radius of the circular arc of the thread root by using a round tool in the advanced image measurement;
4) and adjusting the arc of the measuring circle to coincide with the arc of the measured tooth root as much as possible, wherein the radius of the obtained measuring circle is the arc radius of the common thread tooth root.
A further improvement of the invention is that the split thread is directed past the normal thread centre line and perpendicular to the thread.
The invention is further improved in that the magnification of the sample under the metallographic microscope is 50-100 times.
A further improvement of the invention is that the method is capable of measuring the radius of a circular arc where there are multiple circular arcs of one root.
A further improvement of the invention is that the measured radius of the circular arc may be less than 0.30 mm.
The invention is further improved in that the coincidence line of the measured tooth bottom circular arc and the circle is not less than a quarter of the circumference.
The invention has the following beneficial technical effects:
the anatomical measurement method for the circular arc radius of the common thread root is simple and easy to implement, can accurately measure the circular arc radius of the common thread root after anatomical measurement, and particularly can accurately measure the circular arc radius of which the root has a plurality of circular arcs and the radius is less than 0.30mm, thereby being beneficial to the quality judgment, failure reason analysis and responsibility determination of a threaded part.
Drawings
FIG. 1 shows the macro-morphology and measurement results of the radius of the circular arc of the root of a common thread.
Detailed Description
The invention is further described below with reference to the following figures and examples.
The invention provides an anatomical measurement method for the circular arc radius of a common thread root, which comprises the following steps:
1) cutting the thread part longitudinally through a center line of a common thread part by using linear cutting equipment and in a direction perpendicular to the thread, and manufacturing a sample after coarse grinding, fine grinding and polishing the section;
2) observing the radius of the circular arc at the bottom of the thread by using a proper multiple under a metallographic microscope, and collecting an image, wherein the radius is 50 times, and the appearance of the circular arc at the bottom of the thread is shown in figure 1;
3) analyzing and measuring the collected image by using an OLYCIA m3 metallographic image analysis system, and measuring the radius of the circular arc of the thread root by using a round tool in the advanced image measurement;
4) and (3) respectively measuring the radii of the two circular arcs of the tooth root, adjusting the circular arc of the measuring circle to coincide with the circular arc of the measured tooth root by a quarter of a circle, wherein the radius of the obtained measuring circle is the radius of the circular arc of the common thread tooth root, and as shown in figure 1, the radii of the circular arcs on the left side and the right side of the tooth root are respectively 0.160mm and 0.134 mm.
Claims (6)
1. An anatomical measurement method for the radius of an arc of a common thread root is characterized by comprising the following steps:
1) a common thread piece is longitudinally split by using linear cutting equipment, and a section is subjected to coarse grinding, fine grinding and polishing to prepare a test sample;
2) observing the radius of the circular arc of the thread root by a set multiple under a metallographic microscope and collecting images;
3) analyzing and measuring the collected image by using an OLYCIA m3 metallographic image analysis system, and measuring the radius of the circular arc of the thread root by using a round tool in the advanced image measurement;
4) and adjusting the arc of the measuring circle to coincide with the arc of the measured tooth root as much as possible, wherein the radius of the obtained measuring circle is the arc radius of the common thread tooth root.
2. The method of claim 1, wherein the direction of the split thread is perpendicular to the thread and passes through a centerline of the common thread.
3. The method for anatomically measuring the radius of a conventional thread root as defined in claim 1 wherein the specimen is magnified 50 to 100 times under a metallographic microscope.
4. An anatomical measurement of the radius of a common thread root as claimed in claim 1, wherein the method is capable of measuring the radius of a radius where there are a plurality of arcs of a root.
5. An anatomical measurement of the radius of a common thread root as claimed in claim 1, wherein the radius of the measured arc is less than 0.30 mm.
6. An anatomical measurement of the radius of the arc of a common thread root as claimed in claim 1, wherein the coincidence line of the arc of the measured root and the "circle" is not less than a quarter of a circle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011010518.5A CN112147143A (en) | 2020-09-23 | 2020-09-23 | Anatomical measurement method for circular arc radius of common thread root |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011010518.5A CN112147143A (en) | 2020-09-23 | 2020-09-23 | Anatomical measurement method for circular arc radius of common thread root |
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| Publication Number | Publication Date |
|---|---|
| CN112147143A true CN112147143A (en) | 2020-12-29 |
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| CN202011010518.5A Pending CN112147143A (en) | 2020-09-23 | 2020-09-23 | Anatomical measurement method for circular arc radius of common thread root |
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Citations (5)
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| JPS6234004A (en) * | 1985-08-07 | 1987-02-14 | Nissan Motor Co Ltd | Method for detecting center point of circle and circular arc |
| CN101839696A (en) * | 2010-04-28 | 2010-09-22 | 苏州天准精密技术有限公司 | Image-based radius template automatic calibrator |
| CN103528549A (en) * | 2013-10-14 | 2014-01-22 | 广西壮族自治区质量技术监督局珍珠产品质量监督检验站 | Nondestructive detection method for thickness of nacrelayer of pearl |
| CN105352407A (en) * | 2015-09-30 | 2016-02-24 | 中航飞机起落架有限责任公司 | Measurement tool of minor diameter of MJ outer screw and measurement method of minor diameter of MJ outer screw employing the same |
| CN110360948A (en) * | 2019-07-09 | 2019-10-22 | 大连理工大学 | A kind of laser cladding layer and Pool characterizing method |
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2020
- 2020-09-23 CN CN202011010518.5A patent/CN112147143A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6234004A (en) * | 1985-08-07 | 1987-02-14 | Nissan Motor Co Ltd | Method for detecting center point of circle and circular arc |
| CN101839696A (en) * | 2010-04-28 | 2010-09-22 | 苏州天准精密技术有限公司 | Image-based radius template automatic calibrator |
| CN103528549A (en) * | 2013-10-14 | 2014-01-22 | 广西壮族自治区质量技术监督局珍珠产品质量监督检验站 | Nondestructive detection method for thickness of nacrelayer of pearl |
| CN105352407A (en) * | 2015-09-30 | 2016-02-24 | 中航飞机起落架有限责任公司 | Measurement tool of minor diameter of MJ outer screw and measurement method of minor diameter of MJ outer screw employing the same |
| CN110360948A (en) * | 2019-07-09 | 2019-10-22 | 大连理工大学 | A kind of laser cladding layer and Pool characterizing method |
Non-Patent Citations (7)
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| 付君君;胡建英;梁子进;李志芬;: "轮廓度法在"短圆弧、大半径"类零件圆弧检测中的应用", 现代测量与实验室管理, no. 05 * |
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