A method, device and computer program product for creating a tire tread groove volume distribution curve

Abstract

The present invention relates to the technical field of tire structure design, and in particular to a method, device and computer program product for creating a tire tread groove volume distribution curve. A method for creating a tire tread groove volume distribution curve, wherein the portion between the curve and the outer contour line is the volume occupied by the tread ribs and steel sheets, and the portion below the curve is the volume occupied by the rubber, thereby converting a complex 3D problem into a relatively simple 2D problem. Since the curve is calculated from a three-dimensional pattern diagram, the volume is consistent with the actual mold and has a high degree of accuracy, and can be used as a reference for calculating the material quality of the tread part and the tread rubber design using a material distribution diagram.

Description

Technical Field

[0001] The present invention relates to the technical field of tire structure design, and in particular to a method, device and computer program product for creating a tire pattern groove volume distribution curve. Background Art

[0002] Tires, as the only medium for vehicles to contact the ground, are responsible for important duties such as load bearing, braking and driving safety. When a vehicle is driving on a normal road, the area where the tire actually contacts the ground is the tread. Tire treads play many important roles, including increasing the friction between the tire and the ground, reducing tire noise and enhancing comfort, dissipating heat and water, improving vehicle handling performance, and enhancing visual effects. They are one of the most important items in tire design.

[0003] Due to the existence of the pattern, the space between the outer contour of the tire and the bottom of the pattern groove is not completely filled with rubber material, but partly with rubber and partly with pattern grooves (pattern ribs and steel sheets, etc.). Therefore, when designing the material distribution diagram, the volume between the contour line and the outermost belt cannot be directly calculated as the tread material volume; when designing the rubber profile, the contour line cannot be directly used to measure the thickness of the semi-finished product corresponding to each position, but it needs to be corrected in combination with the pattern land-sea ratio (eliminating the influence of the pattern groove). In traditional design work, the land-sea ratio is usually derived from a two-dimensional pattern diagram, which is quite different from the actual mold. This also results in a large workload for calculating the volume and mass of the tread material, and the accuracy of the design is heavily dependent on the experience of the designer. Summary of the invention

[0004] In order to solve the above technical problems, the purpose of the present invention is to provide a method for creating a tire tread groove volume distribution curve, where the volume between the curve and the outer contour line is the volume occupied by the tread ribs and steel sheets, and the volume below the curve is the volume occupied by the rubber, thereby converting a complex 3D problem into a relatively simple 2D problem. Since the curve is calculated from the three-dimensional pattern diagram, the volume is consistent with the actual mold and has a high degree of accuracy, it can be used as a reference for calculating the material quality of the tread part and the tread rubber design based on the material distribution diagram.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions:

[0006] A method for creating a tire tread groove volume distribution curve, the method comprising the following steps:

[0007] Step 1: Create a 3D pattern model according to the actual pattern;

[0008] Step 2: Symmetrically combine the groove bottom contour line and the outer contour line to form a complete contour line;

[0009] Step 3: parallelize the complete groove bottom contour line inward for a certain distance and smooth it to obtain the inner curve TLine with continuous and consistent curvature;

[0010] Step 4: Parallelize the complete outer contour line to a certain distance outward; perform smoothing to obtain the outer curve PLine with continuous curvature;

[0011] Step 5: Evenly distribute the segmentation points on TLine according to the specified value, make the normal of TLine through each segmentation point as the segmentation line, and rotate these segmentation lines 360° around the rotation axis to form a segmentation surface;

[0012] Step 6: Connect the straight lines at the intersection of two adjacent segmentation lines and Pline; rotate these straight lines 360° around the rotation axis to form an outer contour surface;

[0013] Step 7: The closed space formed between two adjacent segmentation surfaces and the outer contour surface and the surface of the 3D pattern model is the space occupied by the pattern grooves in this area, and the volume value V is obtained;

[0014] Step 8: Calculate the coordinate point corresponding to the area from the volume value V:

[0015] Step 9: Connect the coordinate points to form the pattern groove volume distribution curve.

[0016] Preferably, the rotation axis is the Y axis.

[0017] Preferably, if the groove bottom contour line and the outer contour line are complete contour lines, step 2 is omitted.

[0018] Preferably, in step 3, the complete groove bottom contour line is paralleled inward by a distance of 1-3 mm; in step 4, the complete outer contour line is paralleled outward by a distance of 1-3 mm.

[0019] Preferably, in step 5, the segmentation points are evenly distributed on TLine at a specified interval of 0.5 mm.

[0020] Preferably, the method of step 8 is as follows:

[0021] The volume V' of the solid formed by the quadrilateral unit formed by connecting four points on the YZ plane and rotating around the Y axis. Points 1 and 4 are the intersection points of the previous unit and the current unit, and points 2 and 3 are the intersection points of the next unit and the current unit. Taking the counterclockwise calculation as an example, the volume V' is calculated as follows:

[0022]

[0023] If the volume V obtained in step 7 is equal to the volume V', points 1 and 2 are the intersection points of two adjacent dividing lines and Pline, point 4 is the adjacent point of the previous unit and the current unit, and the coordinates of the three points are known. The coordinates of point 3 can be obtained from the above formula; the midpoint of the line connecting point 3 and point 4 is the coordinate point of this unit.

[0024] Furthermore, the present invention also provides a computer device, including a memory, a processor and a computer program stored in the memory, wherein the processor executes the computer program to implement steps 5) to 9) of the method described in any one of the above technical solutions.

[0025] Furthermore, the present invention also provides a computer-readable storage medium on which a computer program or instruction is stored. When the computer program or instruction is executed by a processor, step 5) to step 9) of the method described in any one of the above technical solutions is implemented.

[0026] Furthermore, the present invention also provides a computer program product, including a computer program or instructions, which, when executed by a processor, implements steps 5) to 9) of the method described in any one of the above technical solutions.

[0027] The present invention adopts the above technical solution and uses an accurate pattern groove volume distribution curve, so that the accurate crown material volume and mass can be obtained when designing the material distribution diagram, so that the design quality of the product can be calculated in the structural design stage, which is conducive to accurate development cost analysis; at the same time, the volume distribution of the tread components can be determined during the construction design (subsequent program cooperation is required), which is conducive to improving the accuracy of the tread rubber design (see Figure 6 ). BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a flow chart of the method of the present invention.

[0029] Figure 2 This is the 3D pattern model of the tire.

[0030] Figure 3 This is an example diagram of PLine and TLine of the present invention.

[0031] Figure 4 This is a calculation principle diagram of the present invention.

[0032] Figure 5 A pattern groove volume distribution curve diagram is obtained for the present invention.

[0033] Figure 6 The invention obtains the application of the pattern groove volume distribution curve diagram in the material distribution diagram and construction design.

[0034] Figure 7It is the program interface of the present invention. DETAILED DESCRIPTION

[0035] The specific implementation modes of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0036] like Figure 1 As shown, a method for creating a tire tread groove volume distribution curve comprises the following steps:

[0037] Step 1: Create a 3D pattern model according to the actual pattern (with the Y axis as the rotation axis), see Figure 2 .

[0038] Step 2: Make the groove bottom contour line and the outer contour line symmetrical and combine them to form a complete contour line. If it is a complete contour line, this step can be omitted.

[0039] Step 3: Parallelize the complete groove bottom contour line inward by a certain distance (such as 2mm) and smooth it to obtain an inner curve TLine with continuous and consistent curvature.

[0040] Step 4: Parallelize the complete outer contour line outward for a certain distance (such as 2mm) and smooth it to obtain the outer curve PLine with continuous curvature.

[0041] The following steps can be implemented programmatically:

[0042] Step 5: Evenly distribute the split points on TLine according to the specified value (such as 0.5mm), and make the normal line (split line) of TLine through each split point. Rotate these split lines 360° around the Y axis to form a split surface.

[0043] Step 6: Connect the straight lines between the intersection points of two adjacent segmentation lines and Pline (point 1, point 2). Rotate these straight lines 360° around the Y axis to form the outer contour surface.

[0044] Step 7: The closed space formed between two adjacent split surfaces and the outer contour surface and the surface of the 3D pattern model is the space occupied by the pattern grooves in this area. CATIA can directly obtain this volume value V.

[0045] Step 8: Calculate the coordinate point corresponding to the area from the volume value V:

[0046] The volume V' of the solid formed by the quadrilateral unit formed by connecting four points on the YZ plane and rotating around the Y axis. Points 1 and 4 are the intersection points of the previous unit and the current unit, and points 2 and 3 are the intersection points of the next unit and the current unit. Taking the counterclockwise calculation as an example, the volume V' is calculated as follows:

[0047]

[0048] If the volume V obtained in step 7 is equal to the volume V', points 1 and 2 are the intersection points of two adjacent dividing lines and Pline, point 4 is the adjacent point of the previous unit and the current unit, and the coordinates of the three points are known. The coordinates of point 3 can be obtained from the above formula; the midpoint of the line connecting point 3 and point 4 is the coordinate point of this unit.

[0049] Step 9: Connect the coordinate points to form the groove volume distribution curve (such as Figure 5 as shown).

[0050] The present invention adopts an accurate pattern groove volume distribution curve, so that the accurate crown material volume and mass can be obtained when designing the material distribution diagram, so that the design quality of the product can be obtained by calculation in the structural design stage, which is conducive to accurate development cost analysis; at the same time, the volume distribution of the tread components can be determined during the construction design (subsequent program cooperation is required), which is conducive to improving the accuracy of the tread rubber design (see Figure 6 ).

[0051] The technical solution of the present invention becomes an easy-to-use tool through CAA programming.

[0052] 1. Start the program and display the program interface (see Figure 7 );

[0053] 2. Select pattern entity, TLine, and Pline in turn;

[0054] 3. Determine the calculation accuracy t;

[0055] 4. Press "OK" to perform volume calculation to obtain the pattern groove volume distribution curve.

[0056] The above is a description of the embodiments of the present invention. Through the above description of the disclosed embodiments, professionals and technicians in the field can implement or use the present invention. Various modifications to these embodiments will be apparent to professionals and technicians in the field. 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 in this article, but will conform to the widest range consistent with the principles and novelties disclosed herein.

Claims

1. A method for creating a tire tread groove volume distribution curve, characterized in that: The method comprises the following steps: Step 1: Create a 3D pattern model according to the actual pattern; Step 2: Symmetrically combine the groove bottom contour line and the outer contour line to form a complete contour line; Step 3: parallelize the complete groove bottom contour line inward for a certain distance and smooth it to obtain the inner curve TLine with continuous and consistent curvature; Step 4: Parallelize the complete outer contour line to a certain distance outward; perform smoothing to obtain the outer curve PLine with continuous curvature; Step 5: Evenly distribute the segmentation points on TLine according to the specified value, make the normal of TLine through each segmentation point as the segmentation line, and rotate these segmentation lines 360° around the rotation axis to form a segmentation surface; Step 6: Connect the straight lines at the intersection of two adjacent segmentation lines and Pline; rotate these straight lines 360° around the rotation axis to form an outer contour surface; Step 7: The closed space formed between two adjacent segmentation surfaces and the outer contour surface and the surface of the 3D pattern model is the space occupied by the pattern grooves in this area, and the volume value V is obtained; Step 8: Calculate the coordinate point corresponding to the area from the volume value V: Step 9: Connect the coordinate points to form the pattern groove volume distribution curve.

2. The method for creating a tire tread groove volume distribution curve according to claim 1, characterized in that: The Y axis is selected as the rotation axis.

3. The method for creating a tire tread groove volume distribution curve according to claim 1, characterized in that: If the groove bottom contour and outer contour are complete contours, skip step 2.

4. The method for creating a tire tread groove volume distribution curve according to claim 1, characterized in that: Step 3: parallel the complete groove bottom contour line inward by 1-3mm; Step 4: parallel the complete outer contour line outward by 1-3mm.

5. The method for creating a tire tread groove volume distribution curve according to claim 1, characterized in that: Step 5 Evenly distribute the split points on TLine at a specified 0.5mm interval.

6. The method for creating a tire tread groove volume distribution curve according to claim 1, characterized in that: The method for step 8 is as follows: The volume V' of the solid formed by the quadrilateral unit formed by connecting four points on the YZ plane and rotating around the Y axis. Points 1 and 4 are the intersection points of the previous unit and the current unit, and points 2 and 3 are the intersection points of the next unit and the current unit. Taking the counterclockwise calculation as an example, the volume V' is calculated as follows: If the volume V obtained in step 7 is equal to the volume V', points 1 and 2 are the intersection points of two adjacent dividing lines and Pline, point 4 is the adjacent point of the previous unit and the current unit, and the coordinates of the three points are known. The coordinates of point 3 can be obtained from the above formula; the midpoint of the line connecting point 3 and point 4 is the coordinate point of this unit.

7. The tire groove volume distribution curve created by the method according to any one of claims 1 to 6 is used in obtaining accurate crown material volume and mass and determining the volume distribution of tread components.

8. A computer device comprising a memory, a processor and a computer program stored in the memory, characterized in that: The processor executes the computer program to implement step 5) to step 9) of the method according to any one of claims 1 to 6.

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, step 5) to step 9) of the method described in any one of claims 1 to 6 are 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, step 5) to step 9) of the method described in any one of claims 1 to 6 are implemented.

Images