CN113865504A - Method for improving tire section scanning image precision - Google Patents
Method for improving tire section scanning image precision Download PDFInfo
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- CN113865504A CN113865504A CN202111008463.9A CN202111008463A CN113865504A CN 113865504 A CN113865504 A CN 113865504A CN 202111008463 A CN202111008463 A CN 202111008463A CN 113865504 A CN113865504 A CN 113865504A
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- 238000000034 method Methods 0.000 title claims abstract description 30
- 239000007787 solid Substances 0.000 claims abstract description 21
- 238000005520 cutting process Methods 0.000 claims abstract description 17
- 238000013461 design Methods 0.000 claims description 11
- 238000012937 correction Methods 0.000 claims description 7
- 239000011324 bead Substances 0.000 claims description 4
- 238000004364 calculation method Methods 0.000 claims description 4
- 238000005259 measurement Methods 0.000 claims description 4
- 238000010146 3D printing Methods 0.000 claims description 3
- 238000003698 laser cutting Methods 0.000 claims description 3
- 230000001502 supplementing effect Effects 0.000 claims description 3
- 238000010187 selection method Methods 0.000 claims description 2
- 238000004458 analytical method Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
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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
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- General Physics & Mathematics (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
The invention discloses a method for improving the accuracy of a tire section scanning image, which comprises the steps of extracting a tire contour line; deleting to obtain an inner contour line; obtaining a closed fixture pattern after symmetry; rotating to generate a three-dimensional graph; establishing three-dimensional models with the same height as the real section from the parallel plane according to the thickness of the real tire section, wherein one model passes through the tire rotation center; cutting the fixture into a plurality of equal-thickness models and symmetrically obtaining a fixture three-dimensional model along a symmetrical plane; recording the distance between the lower two vertexes on the surface symmetry line of the three-dimensional model passing through and not passing through the rotation center to calculate Sn; the solid model is selected according to the type of the tire section for fixing and scanning, and the scanned image is scaled by Sn proportion along the direction vertical to the tire rotation axis. Through the mode, the cutting surface scanning image which does not pass through the tire rotation center is reduced to the standard cutting surface scanning image which passes through the tire rotation center, and the truth of the tire section scanning image is effectively improved.
Description
Technical Field
The invention relates to the field of tire structure analysis, in particular to a method for improving tire section scanning image precision.
Background
The analysis of the tire section is an important means in the tire analysis, the structure in the tire and the size of each part can be known through the measurement and analysis of the tire section, the failure tire is analyzed, the failure reason is searched, the product quality is improved, and the product condition of a competitor is analyzed.
The tyre section is cut from the finished tyre, which after cutting causes two problems: the first is that the tire section profile has a larger difference from the tire section profile in design due to the release of internal stress; the second is that the tire cutting surface does not necessarily pass through the tire rotation center, and when a cutting surface passes through the tire rotation center in the tire cutting process, the cutting surface is accurate, but generally, both cutting surfaces do not pass through the tire rotation center, as shown in fig. 1, if analysis processing is performed according to a section passing through the tire center, the analysis result has a large error, and the larger the tire, the larger the error is.
Through search, the invention patent with publication number CN 111795645A: a method for fixing the cross section of tyre features that the binding plate is used to bind the cross section of tyre completely, so ensuring the consistency between the cross-section outline of tyre and the cross-section outline of finished tyre, and improving the detection precision of cross section.
Disclosure of Invention
The invention mainly solves the technical problem of providing a method for improving the accuracy of a tire section scanning image, which can restore a cutting surface scanning image which does not pass through a tire rotation center to a standard cutting surface scanning image which passes through the tire rotation center, thereby effectively improving the truth of the tire section scanning image.
In order to solve the technical problems, the invention adopts a technical scheme that: the method for improving the accuracy of the tire section scanning image comprises the following steps:
the first step is as follows: extracting a tire contour line according to a tire design drawing;
the second step is that: importing the tire contour line obtained in the first step into three-dimensional software, deleting the contour line on the outer side, and only keeping the inner contour line;
thirdly, supplementing on the basis of the inner contour line obtained in the second step to enable the inner contour line to be a symmetrical closed clamp pattern with strength;
the fourth step: rotating the clamp graph obtained in the third step for 360 degrees by taking a tire design rotation center as a rotation axis to generate a three-dimensional graph;
the fifth step: establishing two parallel surfaces according to the thickness of the section of the real tire to cut out a three-dimensional model which is as high as the real section, wherein one of the two established parallel surfaces is a plane passing through the rotation center of the tire;
and a sixth step: cutting the three-dimensional model obtained in the fifth step into a plurality of equal-thickness models by using a plane parallel to the cutting surface, and obtaining a closed fixture three-dimensional model by symmetrical each obtained equal-thickness model along a symmetrical plane;
the seventh step: finding out a three-dimensional jig model passing through the tire rotation center from all three-dimensional jig models obtained in the sixth step, recording the distance between two lower vertexes on a surface symmetry line of the three-dimensional jig model passing through the rotation center, recording the distance as a standard length L0, measuring records of the rest three-dimensional jig models according to the method, recording the distance between corresponding points of the tangent plane of the nth three-dimensional jig model as Ln, obtaining the reduction multiple of the cut plane passing through the rotation center relative to other cut planes through L0/Ln, and recording the reduction multiple as Sn;
eighth step: making solid models of the three-dimensional models of all the clamps obtained in the sixth step;
the ninth step: and selecting a corresponding solid model according to the type of the tire section to fix, scanning the fixed side, and zooming the scanned image along the direction vertical to the tire rotation axis, wherein the zooming ratio is the Sn value corresponding to the selected solid model, so that the high-precision section scanning image of the tire is finished.
Preferably, in the first step, the tire contour line is extracted according to a tire design drawing, and when the tire is a centrosymmetric circle, the half tire contour line is extracted; when the tire is a non-centrosymmetric circle, the full tire contour line needs to be extracted, and the seventh step does not need to be symmetrically arranged along the symmetric plane.
Preferably, the inner contour line obtained in the second step includes an inner side line and a bottom side line, the bottom side line is downwardly offset by a correction amount distance, the rightmost end of the bottom side line is tangent to the original contour line, the correction amount distance is obtained as follows,
let the minimum radius of rotation of a point on the tire be R1Maximum radius of rotation of R2The cross-sectional length passing through the center of the circle is R2-R1Let the length of the cut section be L1The thickness of the cut tire section is H1The maximum value of the cut tire section length is then:
the calculation formula of the distance to be moved is L1-(R2-R1)。
Preferably, grooves with equal intervals are formed on each equal-thickness model obtained in the sixth step along a symmetry plane, so that measurement is facilitated.
Preferably, the standard length L0 or Ln or Sn in the seventh step is implemented by means of three-dimensional software measurement.
Preferably, the solid model in the eighth step is created by 3D printing or laser cutting.
Preferably, in the ninth step, the corresponding solid model is selected according to the type of the tire section for fixing, the selection method is to measure an angle formed by the intersection of a plane which does not pass through the rotation center and the tire bead rotation arc plane, and the solid model of the corresponding clamp is selected according to the angle.
Preferably, the scaling of the scanned image in the direction perpendicular to the tire rotation axis in the ninth step is performed by Photoshop or other image editing software.
The invention has the beneficial effects that: the method for improving the accuracy of the tire section scanning image provided by the invention aims at the situation that the tire section in the background technology is different from the original section due to the fact that the tire section does not pass through the center of the tire, and simultaneously solves the problem that the tire section which does not pass through the center of rotation of the tire cannot be accurately fixed by the existing technical method.
Drawings
FIG. 1 is a schematic view of a tire of the prior art with two cut planes all not passing through the center of rotation of the tire;
FIG. 2 is a schematic diagram of a tire contour line extracted from a tire design drawing in a first step of the present invention;
FIG. 3 is a view showing the position of the inner contour remaining in the second step of the present invention on the original tire contour;
FIG. 4 is a schematic view of the inner contour extracted in the second step of the present invention;
FIG. 5 is a schematic diagram illustrating the calculation of the distance of the bottom line offset downward by the correction amount in the second step of the present invention;
FIG. 6 is a closed clamp pattern with strength after symmetry obtained in the third step of the invention;
FIG. 7 is a schematic diagram of a three-dimensional solid figure generated after 360 degrees of rotation by using the tire design rotation center as a rotation axis in the fourth step of the present invention;
FIG. 8 is a schematic diagram of a fifth step of the present invention, wherein a three-dimensional model with two parallel planes cut out to have the same height as the real section is built according to the thickness of the real tire section;
FIG. 9 is a schematic representation of a three-dimensional model of a closed fixture obtained after a sixth step of the invention in which the medium thickness model is symmetric along a symmetry plane;
FIG. 10 is a schematic diagram of the structure of the grooves with equal spacing along the symmetry plane on the obtained model with equal thickness in the sixth step of the present invention;
FIG. 11 is a schematic diagram illustrating the distance between two vertices on the symmetry line of the three-dimensional model surface of the fixture passing through the center of rotation in the seventh step of the present invention;
FIG. 12 is a schematic view of the angle at which the plane not passing through the center of rotation intersects the tire bead rotation arc plane as measured in the ninth step of the present invention;
FIG. 13 is a schematic view of the present invention in which a corresponding fixture solid model is selected for fixing according to the type of a tire section;
Detailed Description
The following detailed description of the preferred embodiments of the present invention is provided to enable those skilled in the art to more readily understand the advantages and features of the present invention, and to clearly and unequivocally define the scope of the present invention.
Example (b):
a method for improving the accuracy of a tire section scanning image comprises the following steps:
as shown in fig. 2, the first step: extracting a tire contour line according to a tire design drawing, and when the tire is in a central symmetry circle, extracting a half tire contour line; when the tire is a non-centrosymmetric circle, the situation is rare, and at this time, a full tire contour line needs to be extracted, and the extraction of the tire contour line in the step can be performed by cad software.
As shown in fig. 3 and 4, the second step: introducing the tire contour line obtained in the first step into three-dimensional software, deleting the contour line on the outer side of the tire with different structural layers, only reserving the inner contour line, and then manufacturing a positioning clamp according to the inner contour line;
as shown in fig. 3, 4 and 5, the inner contour line obtained as described above includes an inner side line and a bottom side line, the bottom side line being offset downward by a correction amount distance, the rightmost end of the bottom side line being tangent to the original contour line, the correction amount distance being obtained as follows,
let the minimum radius of rotation of a point on the tire be R1Maximum radius of rotation of R2The cross-sectional length passing through the center of the circle is R2-R1Let the length of the cut section be L1The thickness of the cut tire section is H1The maximum value of the cut tire section length is then:
the calculation formula of the distance to be moved is L1-(R2-R1)。
As shown in fig. 6, in the third step, a closed jig pattern having strength after being symmetrical is formed by supplementing the inner contour line obtained in the second step.
As shown in fig. 7, the fourth step: and (4) rotating the clamp graph obtained in the third step for 360 degrees by taking the tire design rotation center as a rotation axis to generate a three-dimensional graph.
As shown in fig. 8, the fifth step: and establishing two parallel planes according to the thickness of the section of the real tire to cut out a three-dimensional model with the same height as the real section, wherein one of the two established parallel planes is a plane passing through the rotation center of the tire.
As shown in fig. 9, the sixth step: cutting the three-dimensional model obtained in the fifth step into a plurality of equal-thickness models by using a plane parallel to the cutting surface, and obtaining a closed fixture three-dimensional model by symmetrical each equal-thickness model along the symmetrical plane; when the tire is not centrosymmetric and circular, the whole tire contour line extracted in the front does not need to be symmetrically arranged along the symmetric plane.
As shown in fig. 10, for the convenience of measurement, grooves are made at equal intervals along the symmetry plane on each of the equal thickness models obtained.
As shown in fig. 11, the seventh step: and finding out a three-dimensional jig model passing through the tire rotation center from all three-dimensional jig models obtained in the sixth step, recording the distance between two lower vertexes on the surface symmetry line of the three-dimensional jig model passing through the rotation center, recording the distance as a standard length L0, measuring the records of the rest three-dimensional jig models according to the method, recording the distance between corresponding points of the tangent plane of the nth three-dimensional jig model as Ln, obtaining the reduction multiple of the cut plane passing through the rotation center relative to other cut planes through L0/Ln, and recording as Sn, wherein the standard length L0 or Ln or Sn is realized through three-dimensional software measurement.
Eighth step: and manufacturing solid models of the three-dimensional models of all the clamps obtained in the sixth step, wherein the manufacturing of the solid models is performed in a 3D printing or laser cutting mode.
As shown in fig. 12, the ninth step: and selecting a corresponding solid model for fixing according to the type of the section of the tire, wherein the selected method is to measure the angle formed by the intersection of the plane which does not pass through the rotation center and the tire bead rotation arc surface, the angle can be measured by a triangular ruler or other measuring tools, and then the solid model of the corresponding clamp is selected according to the measured angle.
As shown in fig. 13, after the tire section is fixed on the solid model of the fixture, the fixed side is scanned, and the scanned image is scaled by Photoshop or other image editing tools along the direction perpendicular to the tire rotation axis to the Sn value corresponding to the selected solid model.
Up to this point, high precision cross-sectional scanning images of the tire have been completed.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by the present specification, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (8)
1. A method for improving the accuracy of a tire section scanning image is characterized by comprising the following steps:
the first step is as follows: extracting a tire contour line according to a tire design drawing;
the second step is that: importing the tire contour line obtained in the first step into three-dimensional software, deleting the contour line on the outer side, and only keeping the inner contour line;
thirdly, supplementing on the basis of the inner contour line obtained in the second step to enable the inner contour line to be a symmetrical closed clamp pattern with strength;
the fourth step: rotating the clamp graph obtained in the third step for 360 degrees by taking a tire design rotation center as a rotation axis to generate a three-dimensional graph;
the fifth step: establishing two parallel surfaces according to the thickness of the section of the real tire to cut out a three-dimensional model which is as high as the real section, wherein one of the two established parallel surfaces is a plane passing through the rotation center of the tire;
and a sixth step: cutting the three-dimensional model obtained in the fifth step into a plurality of equal-thickness models by using a plane parallel to the cutting surface, and obtaining a closed fixture three-dimensional model by symmetrical each obtained equal-thickness model along a symmetrical plane;
the seventh step: finding out a three-dimensional jig model passing through the tire rotation center from all three-dimensional jig models obtained in the sixth step, recording the distance between two lower vertexes on a surface symmetry line of the three-dimensional jig model passing through the rotation center, recording the distance as a standard length L0, measuring records of the rest three-dimensional jig models according to the method, recording the distance between corresponding points of the tangent plane of the nth three-dimensional jig model as Ln, obtaining the reduction multiple of the cut plane passing through the rotation center relative to other cut planes through L0/Ln, and recording the reduction multiple as Sn;
eighth step: making solid models of the three-dimensional models of all the clamps obtained in the sixth step;
the ninth step: and selecting a corresponding solid model according to the type of the tire section to fix, scanning the fixed side, and zooming the scanned image along the direction vertical to the tire rotation axis, wherein the zooming ratio is the Sn value corresponding to the selected solid model, so that the high-precision section scanning image of the tire is finished.
2. The method for improving the accuracy of the tire section scanning image according to claim 1, wherein the method comprises the following steps: extracting a tire contour line according to a tire design drawing in the first step, and extracting a half tire contour line when the tire is in a centrosymmetric circle; when the tire is a non-centrosymmetric circle, the full tire contour line needs to be extracted, and the seventh step does not need to be symmetrically arranged along the symmetric plane.
3. The method for improving the accuracy of the tire section scanning image according to claim 1, wherein the method comprises the following steps: the inner contour line obtained in the second step includes an inner side line and a bottom side line, the bottom side line is offset downward by a correction amount distance, the rightmost end of the bottom side line is tangent to the original contour line, the correction amount distance is obtained as follows,
let the minimum radius of rotation of a point on the tire be R1Maximum radius of rotation of R2The cross-sectional length passing through the center of the circle is R2-R1Let the length of the cut section be L1The thickness of the cut tire section is H1The maximum value of the cut tire section length is then:
the calculation formula of the distance to be moved is L1-(R2-R1)。
4. The method for improving the accuracy of the tire section scanning image according to claim 1, wherein the method comprises the following steps: and (4) making equidistant grooves on each equal-thickness model obtained in the sixth step along a symmetrical plane, so as to facilitate measurement.
5. The method for improving the accuracy of the tire section scanning image according to claim 1, wherein the method comprises the following steps: the standard length L0 or Ln or Sn in the seventh step is realized by means of three-dimensional software measurement.
6. The method for improving the accuracy of the tire section scanning image according to claim 1, wherein the method comprises the following steps: and the solid model in the eighth step is manufactured in a 3D printing or laser cutting mode.
7. The method for improving the accuracy of the tire section scanning image according to claim 1, wherein the method comprises the following steps: and in the ninth step, selecting a corresponding solid model according to the type of the tire section for fixing, wherein the selection method is to measure an angle formed by the intersection of a plane which does not pass through the rotation center and the tire bead rotation arc surface, and selecting the solid model of the corresponding clamp according to the angle.
8. The method for improving the accuracy of the tire section scanning image according to claim 1, wherein the method comprises the following steps: scaling the scanned image in a direction perpendicular to the tire rotation axis in the ninth step is accomplished by Photoshop or other image editing software.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07174528A (en) * | 1993-12-20 | 1995-07-14 | Yokohama Rubber Co Ltd:The | Measurement method for cross sectional shape of tire |
| KR20080079522A (en) * | 2007-02-27 | 2008-09-01 | 금호타이어 주식회사 | Sidewall section profile measuring equipment for tire |
| CN202074950U (en) * | 2011-05-19 | 2011-12-14 | 广州华工百川科技股份有限公司 | Tyre section fixture for tyre section structure surveying and mapping instrument |
| CN102305599A (en) * | 2011-05-19 | 2012-01-04 | 广州华工百川科技股份有限公司 | Tire section structure surveying instrument and method |
| CN204893757U (en) * | 2015-07-07 | 2015-12-23 | 风神轮胎股份有限公司 | Tire section instrument for assay |
| CN106769112A (en) * | 2017-02-04 | 2017-05-31 | 哈尔滨工大泰铭科技有限公司 | The one reverse restoring method of meridian line tyre structure |
| CN111795645A (en) * | 2020-07-17 | 2020-10-20 | 山东玲珑轮胎股份有限公司 | Accurate tire section binding method |
-
2021
- 2021-08-31 CN CN202111008463.9A patent/CN113865504B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07174528A (en) * | 1993-12-20 | 1995-07-14 | Yokohama Rubber Co Ltd:The | Measurement method for cross sectional shape of tire |
| KR20080079522A (en) * | 2007-02-27 | 2008-09-01 | 금호타이어 주식회사 | Sidewall section profile measuring equipment for tire |
| CN202074950U (en) * | 2011-05-19 | 2011-12-14 | 广州华工百川科技股份有限公司 | Tyre section fixture for tyre section structure surveying and mapping instrument |
| CN102305599A (en) * | 2011-05-19 | 2012-01-04 | 广州华工百川科技股份有限公司 | Tire section structure surveying instrument and method |
| CN204893757U (en) * | 2015-07-07 | 2015-12-23 | 风神轮胎股份有限公司 | Tire section instrument for assay |
| CN106769112A (en) * | 2017-02-04 | 2017-05-31 | 哈尔滨工大泰铭科技有限公司 | The one reverse restoring method of meridian line tyre structure |
| CN111795645A (en) * | 2020-07-17 | 2020-10-20 | 山东玲珑轮胎股份有限公司 | Accurate tire section binding method |
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