CN111795645A

CN111795645A - Accurate tire section binding method

Info

Publication number: CN111795645A
Application number: CN202010691307.6A
Authority: CN
Inventors: 王�锋; 刘建月; 魏胜; 刘伟婧; 姜世元; 林文俊
Original assignee: Shandong Linglong Tyre Co Ltd
Current assignee: Shandong Linglong Tyre Co Ltd
Priority date: 2020-07-17
Filing date: 2020-07-17
Publication date: 2020-10-20

Abstract

The invention relates to an accurate tire section binding method, which utilizes scanning equipment to scan and establish a three-dimensional geometric model of a finished tire in a non-assembly state, and a tire section model in the non-assembly state is generated by the three-dimensional geometric model. The parameters of the tire section model are utilized to manufacture the binding plate with the clamping groove, the cut tire section is placed into the clamping groove of the binding plate, and the clamping groove is utilized to completely bind the tire section. The tire section is completely bound by the binding plate, so that the section shape distortion of the tire section caused by the release of internal stress can be eliminated, the consistency of the tire section contour shape and the finished tire section contour during detection is ensured, and the section detection precision of the tire internal structure is improved.

Description

Accurate tire section binding method

Technical Field

The invention belongs to the field of tire structure analysis, and particularly relates to an accurate tire section binding method.

Background

In the production and processing process of the tire, the rubber material flows in the whole process flow, and the position of the steel wire material is partially changed, so that certain errors exist between the finished tire and the design, and the quality of the tire is influenced. The three-dimensional scanning method can only measure the appearance of the tire but cannot observe the internal situation of the tire, so that the finished tire needs to be split, the tire section size of the finished tire is analyzed, the tire structure and the size of each part can be known through the tire section measurement and analysis, the failed tire is analyzed, the failure reason is searched, and the product quality is improved. Meanwhile, when analyzing the products of competitors, the tires also need to be cut open for corresponding analysis.

As shown in fig. 1, after the tire is cut into a section, the stress of the internal structure of the tire is released, so that the profile shape of the section of the tire is greatly different from the profile shape of the section of an actual tire, the accurate geometric shapes of the internal framework component and the rubber component of the tire cannot be obtained, the detection precision of the geometric dimension of the internal material of the tire is influenced, and the drawing precision of the material distribution diagram of the tire is influenced. Therefore, when the tire section size analysis is carried out, the cut tire section needs to be correspondingly restrained, and the section contour is required to be consistent with the contour of the finished tire. In the conventional method for restraining the tire section, as shown in fig. 2, a plastic adhesive tape is restrained at a cut tire section bead engagement position, the length of the adhesive tape is designed according to the engagement width of an assembly rim, and although the tire section bead engagement position is restrained and fixed, other positions still have large deformation, so that the actual section contour shape of the tire cannot be accurately represented.

The prior Chinese invention patent, patent application number: 201820945924.2, patent name: the utility model provides a tire section locater discloses a tire section locater, can recover out tire section size, improves the measured data accuracy, but only lean on 5 points to retrain fixedly, and the distortion of non-restraint point position section shape still is controlled and can't be revised still, influences tire section size detection accuracy.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide an accurate tire section binding method, which can effectively solve the problems, completely bind the tire section and avoid the deformation of the section shape caused by the release of internal stress.

The invention discloses an accurate tire section binding method, which comprises the following steps:

the first step is as follows: scanning a finished tire in a non-assembly state through scanning equipment, and establishing a three-dimensional geometric model of the finished tire;

obtaining a section profile model of the finished tire in a non-assembly state by using the tire three-dimensional geometric model;

the second step is that: manufacturing a tire section binding plate with a clamping groove by using the tire section profile; the clamping groove is adaptive to the section profile of the tire;

the third step: cutting the finished tire to obtain a tire section;

the fourth step: embedding the tire section into the clamping groove;

the second step and the third step have no definite sequence, and the second step can be implemented first and then the third step can be implemented in the implementation process; the third step may be performed first and the second step may be performed later, and both the above-mentioned two steps can solve the technical problem to be solved by the present invention, and have no influence on the expected effect.

Preferably, in the fourth step, the tire sections are sequentially embedded into the clamping grooves in the order of "bead-sidewall-tread-sidewall-bead".

Preferably, the scanning device is a handheld laser scanning device.

Preferably, the material of the binding plate is acrylic plate.

Preferably, the acrylic sheet has a thickness of not less than 8 mm.

Preferably, the card slot is realized by using a laser cutting technical means.

Preferably, the material of the binding plate is plastic or wood or metal or glass or ceramic.

Preferably, the manufacturing method of the binding plate with the clamping groove comprises wire cutting or blanking or milling or 3D printing.

Preferably, the first step is to establish a three-dimensional geometric model by using point cloud data obtained by scanning.

Preferably, geometric surface packaging and noise reduction processing are performed in the process of establishing the three-dimensional geometric model.

Compared with the prior art, the invention has the beneficial effects that: an accurate tire section binding method utilizes a tire section binding plate to completely bind a tire section, can eliminate the section shape distortion of the tire section caused by the release of internal stress, ensures the consistency of the tire section outline shape and the finished tire section outline during detection, improves the section detection precision of the tire internal structure, improves the material distribution diagram drawing precision of tire section scanning, and meets the tire section analysis requirements of related designers.

Drawings

FIG. 1 is a view of a tire in an unassembled condition;

FIG. 2 is a view of a tire tape restraint in the unassembled condition;

FIG. 3 is a three-dimensional geometric model diagram of a tire;

FIG. 4 is a schematic cross-sectional view of a tire;

FIG. 5 is a schematic diagram of a tie-down plate structure.

In the figure, 1, theoretical tire section profile; 2. actual tire section profile; 3. an adhesive tape; 4. a three-dimensional geometric model; 5. a tire section; 501. a bead; 502. a sidewall; 503. a tread; 6. a binding plate; 7. a clamping groove.

Detailed Description

The invention will be further described with reference to the accompanying drawings, which are provided for illustration of specific embodiments of the invention only and are not to be construed as limiting the invention in any way, the specific embodiments being as follows:

a method of precision tire section tie down, the tie down method comprising:

the first step is as follows: scanning a finished tire in a non-assembly state through scanning equipment, and establishing a three-dimensional geometric model 4 of the finished tire;

the scanning equipment is a handheld three-dimensional laser scanner, handheld 3D laser scanner target positioning points are pasted on the inner surface and the outer surface of a finished product tire in a non-assembly state, the pasting distance of the marking points is not more than 100mm, 2 cameras of the scanner can observe more than 3 target positioning points at the same time, the marking point scanning function of the handheld 3D laser scanner is started to acquire position information of all the marking points, laser point scanning of the outer contour and the inner contour is performed on the finished product tire in the non-assembly state by using 0.3mm resolution precision, the point cloud data of the complete inner contour and outer contour of the finished product tire is acquired, geometric surface packaging and noise reduction are performed on the acquired point cloud data, and a finished product tire three-dimensional geometric model 4 in the non-assembly. The handheld three-dimensional laser scanner is used for three-dimensional scanning and generating a three-dimensional model in a common data format, which belongs to the prior art, and is not repeated herein, and in the embodiment, the model of the handheld three-dimensional laser scanner is a HOLON380 handheld three-dimensional scanner produced by hualang three-dimensional technology (shenzhen) ltd. In addition, other existing devices, other than handheld three-dimensional laser scanners, that are capable of three-dimensional scanning and generating three-dimensional models are equally applicable to the present invention.

Positioning the tire three-dimensional geometric model 4 according to the circular characteristics of the tire three-dimensional geometric model 4, wherein the acquired finished tire three-dimensional geometric model 4 has a plurality of scanning circle characteristics including tread split line circles, pattern block edges, sub-opening exhaust lines and the like, optionally selecting one scanning circle characteristic, selecting more than 3 scanning points in a circumferential range of more than 90 degrees on the scanning circle, and fitting the selected scanning points into a geometric characteristic circle; aligning the origin of the global coordinate of the three-dimensional geometric model 4 of the finished tire with the center of the geometric characteristic circle, and aligning the Z axis of the global coordinate with the central vertical line of the geometric characteristic circle; at the moment, the central perpendicular line of the geometric characteristic circle, the Z axis of the global coordinate system and the axial center line of the three-dimensional geometric model 4 of the finished tire are on the same straight line, and the intersected line of the three-dimensional geometric model 4 of the finished tire is obtained by using the YZ plane of the aligned global coordinate system, so that the tire section model in the non-assembly state is obtained.

The second step is that: and cutting the binding plate 6 by using the tire section model data obtained in the first step in the unassembled state and laser cutting to obtain the clamping groove 7 which is adaptive to the tire section in the unassembled state. Laser cutting belongs to the existing conventional processing means, and is not described in detail herein. The binding plate 6 is an acrylic plate, and the thickness of the acrylic plate is not less than 8 mm. The binding plate 6 may be made of a hard material such as plastic, wood, metal, glass, or ceramic. The method for machining the binding plate 6 having the engaging groove 7 is not limited to laser cutting, and a machining method or a material adding method capable of removing a material from the surface of the hard material, such as wire cutting, blanking, milling, or 3D printing, may be used. The clamping groove 7 is a closed figure in the horizontal direction and is used for completely restraining the tire section 5.

The third step: and cutting the finished tire by using the conventional tire cutting machine to obtain a tire section 5 with a certain width. The width of the tyre section 5 is not less than the thickness of the binding plate 6, so that the binding plate 6 can more firmly fix the tyre section 5 and reduce errors caused by the movement of the tyre section 5.

The fourth step: the tire profile 5 is inserted into the groove 7. Specifically, the tire section 5 is gradually embedded into the clamping groove 8 of the section binding plate finished product 7 according to the sequence of 'bead 501-sidewall 502-tread 503-sidewall 502-bead 501', and the tire section 5 is ensured to be completely matched with the geometric characteristics of the clamping groove 7, such as groove and parting line, of the binding plate 6, so that the tire section 5 is accurately bound, and the geometric dimension detection of the inner and outer outlines and the inner structure of the tire section can be carried out on the basis.

Thus, it should be understood by those skilled in the art that while exemplary embodiments of the present invention have been illustrated and described in detail herein, many other variations or modifications which are consistent with the principles of the invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should be understood and interpreted to cover all such other variations or modifications.

Claims

1. A method of accurately binding a tire section, the method comprising:

the first step is as follows: scanning the finished tire in a non-assembly state through scanning equipment, and establishing a three-dimensional geometric model (4) of the finished tire;

obtaining a tire section model in a non-assembly state by using the three-dimensional geometric model (4);

the second step is that: manufacturing a binding plate (6) with a clamping groove (7) by using the tire section model; the clamping groove (7) is adapted to the tire section model;

the third step: cutting the finished tire to obtain a tire section (5);

the fourth step: embedding the tire section (5) into the clamping groove (7).

2. A tyre section tie-down method according to claim 1, characterized in that in said fourth step said tyre sections (5) are inserted into said slots (7) in the order bead (501) -sidewall (502) -tread (503) -sidewall (502) -bead (501).

3. The method of claim 1, wherein the scanning device is a hand-held laser scanning device.

4. A method for binding tyre sections according to claim 1, characterized in that said binding plate (6) is made of acrylic plate.

5. The method of claim 4, wherein the acrylic sheet has a thickness of not less than 8 mm.

6. A method for binding a tyre section as claimed in claim 4, characterized in that said grooves (7) are obtained by means of laser cutting.

7. A method for binding tyre sections according to claim 1, characterized in that said binding plate (6) material comprises plastic or wood or metal or glass or ceramic.

8. Method for binding a tyre section according to claim 1, characterized in that said method for making the binding plate (6) with the clamping slot (7) comprises wire cutting or blanking or milling or 3D printing.

9. A method for binding tyre sections according to claim 1, characterized in that said first step consists in building a three-dimensional geometric model (4) using point cloud data obtained by scanning.

10. A method according to claim 8, characterized in that during the building of said three-dimensional geometric model (4) a geometric surface packing and noise reduction treatment is carried out.