Tire type rubber outer contour automatic conversion method and system based on coordinate conversion and program product

Abstract

The invention relates to the technical field of tire design, in particular to an automatic conversion method and system for a tire type rubber outer contour based on coordinate conversion and a program product. According to the method, outer contour feature point coordinates of a conversion object and an overturning object are automatically read and processed through a program, the distance from feature points to an upper outer contour is calculated, and new conversion coordinates are generated. Thirdly, automatically drawing the upper part and the lower part of the new contour by a program, and connecting the upper part and the lower part through an automatic algorithm to form a complete conversion contour; according to the method, the design precision and the working efficiency are remarkably improved, manual operation and personal errors are reduced, and the problems of missing points and repeated points caused by manual measurement are avoided. The method has high adaptability, can process automatic conversion of irregular contours, and is suitable for different design software platforms. By reducing the workload of designers and improving the intelligent level, an efficient and accurate automatic solution is provided for tire rubber design, and the method has wide application prospects.

Description

Technical Field

[0001] The present invention relates to the technical field of tire design, and particularly to an automatic conversion method, system and program product for the outer contour of tire profile rubber based on coordinate transformation. Background Art

[0002] In modern tire manufacturing, the design of profile rubber is a crucial link. The main task of tire profile rubber design is to design a suitable outer contour according to the usage requirements and performance indicators of the tire to ensure the stability, wear resistance and other performance characteristics of the tire during use. In traditional tire profile rubber design, two-dimensional design software such as AutoCAD is often used for design. However, existing design tools such as AutoCAD only have basic mirror functions, including vertical mirroring and horizontal mirroring, etc., and these basic functions cannot meet the more complex geometric transformation requirements needed in the design process of tire profile rubber.

[0003] During the design process of tire profile rubber, especially when converting the left-right compound into the up-down compound of the profile rubber, the existing design tools face the following problems: 1. Low precision and efficiency: In existing tools, designers need to manually measure feature points, record data, and finally obtain the coordinates of new feature points and manually draw the new contour. Since this process involves a large amount of manual operations, the repetitive labor is serious, and it is easy to cause precision problems, including measurement errors, omissions or repetitions, resulting in a significant reduction in the design efficiency of tire profile rubber.

[0004] 2. Excessive manual intervention: For some objects with irregular transformations, existing tools cannot perform automatic conversion. Designers need to manually adjust and calculate the coordinates of feature points and rely on manual operations, which not only increases the workload but also easily causes errors.

[0005] 3. Lack of effective tool support: In design software such as AutoCAD or 3D design software (such as CATIA), although basic mirror tools are provided, no effective automatic support is provided for special design requirements such as profile rubber compound conversion. Especially in profile rubber design, the design scheme and requirements of each tire are unique, and often need to be manually adjusted for each specific design, and there is no effective tool for automatic conversion.

[0006] 4. Complex processing of irregular contours: Traditional methods lack systematic and automatic solutions for irregular contour transformations, resulting in inaccurate designs during the contour conversion process, and processing complex geometric shapes requires a large amount of time and calculations, further affecting the design efficiency and quality.

[0007] Therefore, the existing tire bead design methods and tools have obvious deficiencies, unable to meet the requirements of the tire bead outer contour conversion for complex designs and high-precision needs, greatly increasing the workload of designers and reducing the design efficiency. Summary of the Invention

[0008] To solve the above technical problems, the present invention proposes an automatic conversion method for the outer contour of a tire bead based on coordinate transformation, aiming to realize the operation of automatically converting the left-right compound of the tire bead into an up-down compound through software automation, reduce manual operations, improve the accuracy and efficiency of design, and provide a more efficient and accurate tool for tire bead design.

[0009] To achieve the above object, the present invention adopts the following technical solutions: An automatic conversion method for the outer contour of a tire bead based on coordinate transformation, comprising the following steps: Step 1: Select the conversion object and the up-and-down flipping object. The program reads all the characteristic point coordinates of the outer contour of the conversion object, denoted as (x, y), and reads all the characteristic point coordinates of the outer contour of the flipping object, denoted as (a, b); Step 2: Process the coordinate data, including: 2.1) Sort the coordinate groups of (x, y) and (a, b) according to the magnitude of the abscissa, and screen out all the characteristic points whose abscissa is within the coordinate group of the flipping object (a, b); 2.2) For the screened characteristic points xi = x, calculate the vertical distance yi from this point to the upper outer contour to obtain the conversion coordinate group (xi, yi) of the conversion contour. Among them, the distance difference between characteristic points is processed during the calculation process, and for the characteristic points located at the boundary of the conversion object and the flipping object, refined distance optimization calculation is performed; 2.3) Mirror the ordinate of the coordinate group (a, b) of the flipping object up and down to obtain the conversion coordinate group (a, -b) of the characteristic points of the flipping object. Among them, the mirror operation flips the flipping object up and down and optimizes the coordinate symmetry; Step 3: Use the program to draw the new converted contour, including: 3.1) Draw the upper part of the new converted contour, including the following two parts: 3.1.1) The part where the characteristic point coordinates of the conversion object remain unchanged: that is, the part where the abscissa of the conversion object is outside the range of the a coordinate group, and draw it with the original coordinates; 3.1.2) The part where the characteristic point coordinates of the conversion object change: For the characteristic points whose abscissa is within the range of the a coordinate group, draw them according to the conversion coordinates (xi, yi) calculated in step 2.2); 3.2) Draw the lower part of the new converted contour, draw the feature points in the converted coordinate group (a, -b) of the flipped object, and connect the points one by one in the order of decreasing abscissa to form the lower half of the converted contour; Step 4: Connect the upper part and the lower part obtained in Step 3 to form a complete new contour, where the tail feature point of the upper part and the head feature point of the lower part are connected by an automatic algorithm to complete the generation of the final converted contour.

[0010] Preferably, in Step 1, the bottom edge of the converted object is a horizontal line, and the y-coordinate of the last point in the feature point coordinate group is equal to the y-coordinate of the first point, and the upper outer contour is the contour part after removing the horizontal bottom line of the converted object and the flipped object.

[0011] Preferably, in Step 2.1, when sorting the (x, y) coordinate group and the (a, b) coordinate group by abscissa, an adaptive sorting algorithm is used to improve the processing ability of complex contour feature points.

[0012] Preferably, in Step 3.1, the program connects the points one by one in ascending order according to the abscissa sorting of the feature points, and automatically corrects the errors of the feature points during the processing to ensure the smoothness and accuracy of the connecting line.

[0013] Preferably, in Step 3.2, the program is based on the feature points in the coordinate group (a, -b) of the flipped object to optimize the connection method of the lower half of the contour, ensure that the transition of the lower half is more natural, and avoid curve mutations caused by uneven intervals of data points.

[0014] Preferably, in Step 4, the program seamlessly connects the upper and lower part contours through an adaptive algorithm, avoiding manual intervention, and improving the automation accuracy and working efficiency of the converted contour.

[0015] Furthermore, the present invention also provides an automatic conversion system for the outer contour of a tire-shaped rubber, which implements the above method, including: A calculation module, used to read the outer contour feature point coordinates of the converted object and the flipped object, and rearrange and screen the coordinate data; A data processing module, used to calculate the distance of the screened feature points and generate conversion coordinates; A drawing module, used to generate the upper half and the lower half of the converted contour according to the conversion coordinates, and connect the two parts to form the final converted contour.

[0016] Preferably, the calculation module performs adaptive sorting according to the abscissa of the feature points, and calculates the distance from the feature points to the upper outer contour according to the optimized calculation formula, so as to improve the accuracy of the conversion coordinates.

[0017] Furthermore, the present invention also provides a computer-readable storage medium, on which a computer program or instruction is stored, and when the computer program or instruction is executed by a processor, the method is implemented.

[0018] Furthermore, the present invention also provides a computer program product, including a computer program or instruction, and when the computer program or instruction is executed by a processor, the method is implemented.

[0019] Due to the adoption of the above technical solution, the method of the present invention greatly improves the accuracy and work efficiency in the design process of the tread compound through automation technology. Compared with the prior art, the present invention has the following remarkable technical effects: 1. Improve design accuracy: The present invention automatically calculates the conversion of the coordinates of feature points through a program, avoiding manual measurement errors and reducing errors that may occur due to manual drawing, such as missing points, duplicate points, and errors. The conversion process is based on coordinate data processing and optimization calculations, ensuring the accuracy of the new contour and thus improving the overall accuracy of the tire tread compound design.

[0020] 2. Significantly improve work efficiency: Through the automated conversion process, the present invention effectively reduces the manual operations and repetitive labor of designers, making the conversion of the tread compound contour no longer rely on cumbersome manual measurement, recording, and drawing steps. Designers only need to select the conversion object and the flipping object, and the program automatically completes the remaining operations, greatly improving the design efficiency and shortening the design cycle.

[0021] 3. Reduce manual intervention: Existing design tools require designers to manually measure, record coordinates, and manually draw the complex outer contour of the tread compound. The present invention reduces manual intervention through an automated program. Designers only need to input the necessary initial data, and the program can automatically complete coordinate conversion, contour drawing, and connection work, reducing errors in manual operations.

[0022] 4. Adapt to diverse design requirements: The present invention can flexibly handle different types of tire tread compound designs, especially for the conversion of complex and irregular contours, and can automatically adjust and convert coordinates according to specific requirements. Whether it is a left-right composite conversion or an up-down composite conversion, it can be automatically completed according to the design requirements, with strong adaptability.

[0023] 5. Improve the intelligence level of design tools: Through the method of the present invention, the tread compound design is no longer limited to simple mirror operations, but introduces a calculation model for coordinate conversion, making the tread compound design tool have a higher intelligence level. Especially when dealing with irregular contours, the automated conversion method can provide accurate and efficient solutions, providing a more intelligent auxiliary tool for tire designers.

[0024] 6. Reduce the workload of designers: Due to the automated nature of the present invention, designers no longer need to perform cumbersome manual operations such as feature point measurement, data recording, and manual contour drawing, thus reducing their workload. Designers can focus more on design optimization and other key decisions.

[0025] 7. Applicable to multiple design software: The coordinate conversion method of the present invention can not only be applied to existing 2D design software (such as AutoCAD), but also be compatible with more advanced 3D design platforms (such as CATIA). Therefore, the present invention has wide applicability and can meet the needs of users of different design software, further expanding its application scope.

[0026] In summary, the automatic conversion method of the outer contour of tire-shaped rubber based on coordinate conversion of the present invention has significant technical advantages in improving design accuracy, enhancing work efficiency, reducing manual intervention, and reducing the workload, providing an efficient, accurate, and intelligent solution for the field of tire-shaped rubber design. Brief Description of the Drawings

[0027] Figure 1 Are the conversion object and the up and down flipped object.

[0028] Figure 2 Is the converted new contour.

[0029] Figure 3 Are the outer contours of the conversion object and the up and down flipped object.

[0030] Figure 4 Are the position data of the feature points of the conversion object and the up and down flipped object.

[0031] Figure 5 Is the segmented contour before automatic connection of the program.

[0032] Figure 6 Is the conversion after mirroring the conversion object. Detailed Embodiment

[0033] Next, in combination with the embodiments of the present invention, the technical solutions in the embodiments will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0034] An automatic conversion method of the outer contour of tire-shaped rubber based on coordinate conversion includes the following steps: Step 1, select the conversion object and the up and down flipped object: Select the object to be transformed. The program reads the coordinates of all the feature points on the outer contour of the object to be transformed, denoted as (x, y); select the object to be flipped up and down. The program reads the coordinates of all the feature points on the outer contour of the flipped object, denoted as (a, b). Note: The bottom side of the default object to be transformed is a horizontal line, that is, the y-coordinate of the last point in the (x, y) coordinate group is equal to the y-coordinate of the first point - the upper outer contour refers to the contour part of the object to be transformed and the flipped object excluding the horizontal bottom line.

[0035] Step 2, Coordinate data processing: 2.1) According to the (x, y) coordinate group and (a, b) coordinate group read in Step 1, the program rearranges the two groups of feature points according to the horizontal coordinates of the feature points, and filters out all the feature points whose horizontal coordinates are within the range of a in the (a, b) coordinate group of the flipped object; 2.2) For the feature point xi = x selected in 2.1, the program calculates the distance yi from this point to the upper outer contour to obtain the transformed coordinate group (xi, yi) of the transformed contour feature points; 2.2.1) For the feature points located on the object to be transformed, calculate the distance from this point to the upper outer contour of the flipped object; 2.2.2) For the feature points located on the flipped object, calculate the distance from this point to the upper outer contour of the object to be transformed; Note: The bottom side of the default object to be transformed is a horizontal line, that is, the y-coordinate of the last point in the (x, y) coordinate group is equal to the y-coordinate of the first point - the upper outer contour refers to the contour part of the object to be transformed and the flipped object excluding the horizontal bottom line.

[0036] 2.3 Vertically mirror the (a, b) coordinate group of the flipped object up and down to obtain the transformed coordinate group (a, -b) of the feature points of the flipped object.

[0037] Step 3, Use the program to draw the new transformed contour 3.1) The upper part of the new transformed contour: includes the part where the feature point coordinates of the object to be transformed remain unchanged and the part where the feature point coordinates change.

[0038] 3.1.1) The part where the feature point coordinates of the object to be transformed remain unchanged: the part of the object to be transformed whose horizontal coordinates are outside the range of the a coordinate group, using (x, y) as the feature points of the new contour. The program connects the points one by one in ascending order of the horizontal coordinates.

[0039] 3.1.2) The part where the feature point coordinates of the object to be transformed change: the transformed coordinates of the feature points whose horizontal coordinates are within the range of the a coordinate group, that is, the (xi, yi) coordinate group obtained in Step 2.2. The program connects the points one by one in ascending order of the horizontal coordinates.

[0040] Note: For the feature points above the dividing line, the transformed coordinate points (xi, yi) are connected point by point in ascending order of the abscissa by a program, which is only applicable when the dividing line is a linear function of the first order.

[0041] 3.2) Transforming the lower part of the new contour: That is, the transformed coordinate group of the coordinate group (a, b) is (a, -b), and the program connects the points one by one in descending order of the abscissa.

[0042] Step 4, the program connects the head and tail feature points of the two transformed contour lines in 3.1) and the transformed contour line in 3.2).

[0043] The program automatically connects the tail feature point in 3.1.1) and the head feature point in 3.1.2), and connects the tail feature point in 3.2) and the head feature point in 3.1), thus obtaining the transformed new contour.

[0044] Note: The above is only for the conversion of the rubber profile diagram with the flipping object on the right. For the case where the flipping object is on the left, first mirror the conversion object left and right to adjust the flipping object to the right, and then perform contour conversion according to steps 1, 2, 3, and 4. Mirror the converted contour left and right again to obtain the target converted contour.

[0045] Next, in conjunction with the accompanying drawings, the optimal implementation manner of the present invention will be described.

[0046] Step 1, select the conversion object and the up and down flipping object: Select the conversion object, and the program reads all the feature point coordinates of the outer contour of the conversion object, denoted as (x, y); select the up and down flipping object, and the program reads all the feature point coordinates of the outer contour of the flipping object, denoted as (a, b); In Example 3, the coordinate group (x, y) is: P1(0, 0), P2(0, 0.5), P3(1, 0.8), P4(6, 2.8), P5(24, 2.8), and P6(48, 0); (a, b) coordinate group is: P7(19, 0), P8(19, 0.75), P9(33, 1.75), P10(48, 0).

[0047] Step 2, coordinate data processing: 2.1 According to the (x, y) coordinate group and (a, b) coordinate group read in Step 1, the program rearranges the two groups of feature points according to the size of the abscissa of the feature points, and screens out all the feature points whose abscissa is located in the (a, b) coordinate group of the flipping object, that is, P7(19, 0), P8(19, 0.75), P5(24, 2.8), P9(33, 1.75), P10(48, 0) in Example 3; Note: P10 and P6 are the same points. Delete one during program processing. Take P10 as an example for retention.

[0048] 2.2 For the feature point xi = x selected in 2.1, the program calculates the distance yi from this point to the upper outer contour to obtain the conversion coordinate group (xi, yi) of the converted contour feature points. That is, P11 (19, 2.8), P12(19, 2.05), P13(24, 1.69286), P14(33, 0), P15(48, 0) in Figure 4.

[0049] 2.3 Vertically mirror the ordinate of the flipped object coordinate group (a, b) to obtain the conversion coordinate group (a, -b) of the flipped object feature points. That is, P7’(19, 0), P8’(19, -0.75), P9’(33, -1.75), P10’(48, 0) in Figure 4.

[0050] Step 3, use the program to draw the converted new contour 3.1 The upper part of the converted new contour: includes the part where the coordinates of the converted object feature points remain unchanged and the part where the coordinates of the feature points change.

[0051] 3.1.1) The part where the coordinates of the converted object feature points remain unchanged: the part of the converted object's abscissa outside the a coordinate group range, using (x, y) as the new contour feature points. That is, P1(0, 0), P2(0, 0.5), P3(1, 0.8), P4(6, 2.8) in Figure 4. The program connects the points one by one in ascending order of abscissa.

[0052] 3.1.2) The part where the coordinates of the converted object feature points change: the converted coordinates of the feature points whose abscissas are within the a coordinate group range, that is, the (xi, yi) coordinate group obtained in step 2.2. That is, P11(19, 2.8), P12(19, 2.05), P13(24, 1.69286), P14(33, 0), P15(48, 0) in Figure 4. The program connects the points one by one in ascending order of abscissa.

[0053] 3.2 The lower part of the converted new contour: That is, the converted coordinate group (a, -b) of the coordinate group (a, b), P10’(48, 0), P9’(33, -1.75), P8’(19, -0.75), P7’(19, 0) in Figure 4. The program connects the points one by one in descending order of abscissa.

[0054] Step 4, the program deletes the duplicate points again and connects the head and tail feature points of the two converted contour lines in 3.1 and the converted lower contour line in 3.2.

[0055] In Example 5, P15 and P6' are the same points. The program processes to delete one of them, and connects the tail feature point P4(6, 2.8) in 3.1 1) and the head feature point P11(19, 2.8) in 3.1.2), and connects the tail feature point P7'(19, 0) in 3.2 ) and the head feature point P1(0, 0) in 3.1), thus obtaining the converted new contour.

[0056] The above is the description of the embodiments of the present invention. Through the above description of the disclosed embodiments, those skilled in the art can implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but rather to the broadest scope consistent with the principles and novel points disclosed herein.

Claims

1. A method for automatically converting the outer contour of a tire profile based on coordinate transformation, characterized in that: The following steps are involved: Step 1: Select the object to be converted and the object to be flipped upside down or downside down. The program reads the coordinates of all feature points of the outer contour of the converted object, recorded as (x, y), and reads the coordinates of all feature points of the outer contour of the flipped object, recorded as (a, b); Step 2: Processing the coordinate data, including: 2.1) Sort the (x, y) and (a, b) coordinate groups according to the size of the horizontal coordinates, and filter out all feature points whose horizontal coordinates are in the (a, b) coordinate group of the flipped object; 2.2) For the selected feature point xi=x, calculate the vertical distance yi from the point to the upper outer contour to obtain the transformed coordinate set (xi, yi) of the transformed contour. The calculation process includes processing the distance difference between the feature points, and performing refined distance optimization calculation for the feature points located at the boundary of the transformed object and the flipped object; 2.3) Mirroring the vertical coordinates of the flipped object coordinate group (a, b) up and down to obtain the transformed coordinate group (a, -b) of the feature points of the flipped object, wherein the mirroring operation flips the flipped object up and down and optimizes the coordinate symmetry; Step 3: Use the program to draw the new contour, including: 3.1) Draw the upper part of the converted new contour, which includes the following two parts: 3.1.1) The unchanged part of the feature point coordinates of the converted object: that is, the part of the horizontal coordinates of the converted object outside the range of the a coordinate group is drawn with the original coordinates maintained; 3.1.2) Coordinate change of feature points of the transformed object: feature points whose horizontal coordinates are within the range of the a coordinate group are drawn according to the transformed coordinates (xi, yi) calculated in step 2.2); 3.2) Draw the lower part of the transformed new contour, draw the feature points in the transformed coordinate group (a, -b) of the flipped object, and connect them point by point in descending order of the horizontal coordinates to form the lower half of the transformed contour; Step 4: Connect the upper and lower parts obtained in step 3 to form a complete new contour, where: The tail feature points of the upper part and the head feature points of the lower part are connected through an automatic algorithm to complete the generation of the final transformed new contour.

2. The method according to claim 1, characterized in that In step 1, the bottom edge of the converted object is a horizontal line, and the y coordinate of the last point in its feature point coordinate group is equal to the y coordinate of the first point, and the upper outer contour is the contour part of the converted object and the flipped object after removing the horizontal bottom line.

3. The method according to claim 1, characterized in that In step 2.1, when the (x, y) coordinate group and the (a, b) coordinate group are sorted by the horizontal coordinates, an adaptive sorting algorithm is used to improve the processing capability of complex contour feature points.

4. The method according to claim 1, characterized in that In step 3.1, the program sorts the feature points by their horizontal coordinates and connects them point by point in ascending order, and automatically corrects the errors of the feature points during the processing to ensure the smoothness and accuracy of the connecting lines.

5. The method according to claim 1, characterized in that In step 3.2, the program optimizes the connection method of the lower half contour based on the feature points in the flipped object coordinate group (a, -b), ensuring a more natural transition of the lower half and avoiding sudden curve changes caused by uneven data point spacing.

6. The method according to claim 1 is characterized in that in step 4, the program seamlessly connects the upper and lower contours through an adaptive algorithm to avoid manual intervention, thereby improving the automation accuracy and work efficiency of the converted contours.

7. A system for automatically converting the outer contour of a tire profile, characterized in that the system implements the method described in any one of claims 1 to 6, comprising: A calculation module, used for reading the coordinates of the outer contour feature points of the converted object and the flipped object, and rearranging and filtering the coordinate data; The data processing module is used to calculate the distance of the selected feature points and generate the conversion coordinates; The drawing module is used to generate the upper half and the lower half of the transformation contour according to the transformation coordinates, and connect the two parts to form the final transformation contour.

8. The system according to claim 7, characterized in that The calculation module performs adaptive sorting according to the horizontal coordinates of the feature points, and calculates the distance from the feature points to the upper outer contour according to the optimized calculation formula, thereby improving the accuracy of the converted coordinates.

9. A computer-readable storage medium having a computer program or instruction stored thereon, characterized in that: When the computer program or instruction is executed by a processor, the method according to any one of claims 1 to 6 is implemented.

10. A computer program product comprising a computer program or instructions, characterized in that When the computer program or instruction is executed by a processor, the method according to any one of claims 1 to 6 is implemented.

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