A calculation and correction method, application, device and computer program product for tire building drum width

Abstract

The present invention relates to the field of intelligent tire production technology, and in particular to a method, application, device and computer program product for calculating and correcting the width of a tire drum. The present invention aims at the characteristics of the tire green tire embryo layer laminating process, and proposes a method for numerically calculating the width of a tire drum and correcting it according to the tire cross-section profile cord length design, drum curve and semi-finished cord cutting angle. The method fills the gap in the theoretical and practical interactive calculation of the width of the drum by the layer laminating method.

Description

Technical Field

[0001] The present invention relates to the technical field of intelligent tire production, and in particular to a calculation and correction method, application, equipment and computer program product for tire building drum width. Background Art

[0002] In the tire green tire blank forming process using the layer-by-layer method, the width of the forming drum is a key construction parameter, which not only affects the qualified rate of the finished product, but also affects the tire performance. The theoretical calculation value of the forming drum width deviates greatly from the actual value, which will increase the difficulty of construction and bring difficulties to tire research and development and production. Developing a method for numerical calculation and correction of tire forming drums, taking into account the actual process capabilities of different factories or production lines, will be very valuable in engineering and produce good economic benefits.

[0003] Traditional tire construction design solves the forming drum width, and the carcass stretch coefficient is assumed based on experience. However, the actual production process is affected by process differences, and the drum width and coefficient must be repeatedly trial-produced and corrected. Different engineering technicians achieve different results, and there is no unification or standardization. This is gradually out of touch with the automation, dataization, and informatization of future factories.

[0004] A Chinese invention patent application (publication number: CN110781554A, publication date: 20200211) discloses a method for calculating the drum width of a heavy-loaded all-steel radial tire building drum. The calculation formula for the drum width of the building machine is as follows: C=(2ac / (1+t)-2[LB]-z, where: ac is the length of the carcass cord from the center of the crown to the lower end point of the tire bead; t is the elongation of the carcass cord of the all-steel tire; L is the length of the drum shoulder curve; B is the height of the drum shoulder curve; z is the coefficient. By accurately calculating the width of the building drum, the cost waste caused by reprocessing the building drum due to inappropriate design of the drum width of the building drum can be avoided. However, the method of this patent requires manual correction of the calculated building drum width based on experience. Summary of the invention

[0005] In order to solve the above technical problems, the present invention proposes a method for numerically calculating the width of tire drum and its correction according to the characteristics of tire green tire embryo layer laminating process, the tire cross-section profile cord length design, the drum curve, and the cutting angle of semi-finished cord fabric. This method fills the gap in the theoretical and practical interactive calculation of the width of the drum in the layer laminating method.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions:

[0007] A method for calculating the width of a tire building drum is disclosed. The method uses a δ-c equation to calculate the width of the building drum. The δ-c equation is composed of the following equations (1) and (2):

[0008]

[0009] sinα′0=c2 sinα0 (2);

[0010] In equation (1) and equation (2),

[0011] B s - Width of the forming drum, mm;

[0012] L t -The required cord length between the crown center of the finished carcass cord layer and the wire bead diameter position, mm;

[0013] L d - Required cord length for the curved part of the shoulder of the drum, mm;

[0014] α0'-cutting angle of the first layer of cord on the forming drum, °;

[0015] α0-cutting angle of semi-finished cord fabric, °;

[0016] C-building drum shoulder curve width, mm;

[0017] δ-cord assumed stretch;

[0018] c1-Correction coefficient of finished tire cord length;

[0019] c2-semi-finished cord cutting angle correction factor;

[0020] c3-Correction factor of cord length at the shoulder of the forming drum.

[0021] As a preferred embodiment, in the δ-c equation, the stretch δ affects the tire carcass cord length under ideal conditions and is the assumed design target; c1, c2, and c3 correct the deviation from the assumed target in the actual manufacturing process and are affected by the process capability and the carcass cord material itself; L t Calculate the cord length from the crown center of the finished carcass cord layer to the horizontal intersection of the wire bead diameter Db and the cord; L d The cord length between the radial starting point of the width C of the shoulder curve of the forming drum to the horizontal intersection of the wire ring diameter Db and the cord is calculated; the α0 cord cutting process is generally set in the range of 0° to 70°; the C value is a constant value obtained from the shoulder curve of the forming drum.

[0022] Furthermore, the present invention also discloses a method for correcting the width of a tire building drum, the method comprising the following steps:

[0023] 1) According to the new tire design parameters, the assumed drum width B is calculated by the δ-c equation s ;

[0024] 2) Through the cord material of the new tire, the assumed value of δ, the ratio of the tire inner cord to the first layer of cord diameter, and the production line selection, a similar sample group in production was obtained in the construction database;

[0025] 3) Substitute the tire parameters contained in the sample group into the δ-c equation and solve it through a computer program to obtain α0, c1, c2, c3;

[0026] 4) Using the c1, c2, and c3 values ​​of a similar sample group on an actual production line, the δ-c equation is used to correct and calculate the width of the new tire forming drum.

[0027] Preferably, a similar sample group is identified in the construction database according to the new tire section design parameters, and the number of group samples should be greater than or equal to 3.

[0028] Preferably, the similarity of similar sample groups is increased in the following order:

[0029] 1) When the carcass cord materials are the same, the δ values ​​are close and weakly similar;

[0030] 2) Satisfying 1) and the tire diameter is close to the diameter of the first layer of cord, and is basically similar;

[0031] 3) Satisfying 2) and the processes of cutting, winding and unwinding the cord are similar, which is highly similar;

[0032] 4) Satisfies 3) and the forming method and forming drum shoulder curve are consistent and very similar.

[0033] Furthermore, the invention also discloses the application of the method in calculating the width of a tire construction drum.

[0034] Furthermore, the present invention also discloses 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 the method.

[0035] Furthermore, the present invention also discloses 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, the method is implemented.

[0036] Furthermore, the present invention also discloses a computer program product, including a computer program or instructions, which implement the method when executed by a processor.

[0037] The present invention adopts the above-mentioned technical solution, and in view of the characteristics of the tire green tire embryo layer pasting process, according to the tire cross-section profile cord length design, forming drum curve, and semi-finished cord cutting angle, a method for numerically calculating the tire forming drum width and correction is proposed. The method of the present application can be combined with the actual process capabilities of the differences, has strong versatility, and has high accuracy, less human intervention, and can be automatically corrected, so as to achieve the purpose of shortening the debugging cycle and reducing tooling and trial production costs. The invention fills the gap in the theoretical and practical interactive calculation of the width of the forming drum by the layer pasting method. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 Schematic diagram of the location of parameter values ​​for the δ-c equation.

[0039] Figure 2 It is a schematic diagram of the invention process. DETAILED DESCRIPTION

[0040] The specific implementation modes of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0041] A method for calculating the width of a tire building drum is disclosed. The method uses a δ-c equation to calculate the width of the building drum. The δ-c equation is composed of the following equations (1) and (2):

[0042]

[0043] sinα′0=c2 sinα0 (2);

[0044] In equation (1) and equation (2),

[0045] B s - Width of the forming drum, mm;

[0046] L t -The required cord length between the crown center of the finished carcass cord layer and the wire bead diameter position, mm;

[0047] L d - Required cord length for the curved part of the shoulder of the drum, mm;

[0048] α0'-cutting angle of the first layer of cord on the forming drum, °;

[0049] α0-cutting angle of semi-finished cord fabric, °;

[0050] C-building drum shoulder curve width, mm;

[0051] δ-cord assumed stretch;

[0052] c1-Correction coefficient of finished tire cord length;

[0053] c2-semi-finished cord cutting angle correction factor;

[0054] c3-Correction factor of cord length at the shoulder of the forming drum.

[0055] In the above δ-c equation, the stretch δ affects the tire carcass cord length under ideal conditions and is the assumed design target; c1, c2, and c3 correct the deviation from the assumed target in the actual manufacturing process and are affected by the process capability and the carcass cord material itself; L t Calculate the cord length from the crown center of the finished carcass cord layer to the horizontal intersection of the wire bead diameter Db and the cord, such as Figure 1 As shown; L d Calculate the cord length from the radial starting point of the curve width C of the forming drum shoulder to the horizontal intersection of the wire ring diameter Db and the cord, as follows: Figure 1 As shown; the α0 carcass cord cutting process is generally set in the range of 0° to 70°; the C value is a constant value obtained from the shoulder curve of the forming drum.

[0056] See the process of calculating and correcting the width of the forming drum for Figure 2 First, we need to identify similar sample groups in the construction database based on the new tire section design parameters. The number of group samples should be greater than or equal to 3. The similarity can be increased in sequence according to steps 1-4:

[0057] 1. When the carcass cord materials are the same, the δ values ​​are close and weakly similar;

[0058] 2. Satisfy 1 and the tire diameter is similar to the diameter of the first layer of cord;

[0059] 3. If 2 is met and the processes of cutting, winding and unwinding of the cord are similar, they are highly similar;

[0060] 4. Satisfy 3 and the forming method and forming drum shoulder curve are consistent and very similar.

[0061] The sample group B s ,α0,L t , L d By substituting the δ, δ, and C parameters into the δ-c equation, the mean solution of c1, c2, and c3 can be obtained, which is used as the correction parameter for calculating the width of the new construction forming drum. After trial production and verification, it is stored in the construction database. This recursive process is automatically solved and corrected using a computer program.

[0062] Example 1

[0063] Take the newly designed tire specification 225 / 75-14 (27x9-14) as an example:

[0064] 1. According to the new tire design parameters, α0 = 28°, δ = 1.035, c1 = 1.0, c2 = 1.01, c3 = 1.0, the assumed drum width B is calculated by the δ-c equations =504mm;

[0065] 2. Through the cord material of the new tire, the assumed value of δ, the ratio of the inner cord to the first layer of cord diameter, and the production line selection, a similar sample group in production was obtained in the construction database;

[0066] 3. Substitute the tire parameters contained in the sample group into the δ-c equation and solve it through a computer program to obtain α0 = 28°, c1 = 0.9987, c2 = 1.0102, c3 = 1.0922;

[0067] 4. Use the c1, c2, c3 values ​​of similar sample groups on the actual production line to correct and calculate the new tire building drum width B through the δ-c equation s =508mm;

[0068] 5. Use B s =508mm forming drum width for construction, and after trial production and trial production confirmation, it can be stored in the construction database.

[0069] Example 2

[0070] Take the production specification 3.00-10 as an example:

[0071] 1. According to the cross-sectional profile parameters, α0 = 29°, δ = 1.035, c1 = 1.0, c2 = 1.01, c3 = 1.0, the assumed drum width B is calculated by the δ-c equation s =186.8mm;

[0072] 2. Obtain similar sample groups through the construction data of this specification;

[0073] 3. Substitute the tire parameters contained in the sample group into the δ-c equation and solve it through a computer program to obtain c1=0.9914, c2=1.0102, c3=1.0005;

[0074] 4. The c1, c2, c3 values ​​obtained from the sample group are used to correct the calculation of the forming drum width B through the δ-c equation s =190.1mm;

[0075] 5. The B used in the actual production of this specification s =190mm, the corrected calculation is consistent with the actual situation.

[0076] The present invention has been applied in the automated construction design of motorcycle tires, electric motorcycle tires, and ATV matching tires. It is applicable to radial structures and oblique structures, and can be automatically programmed and corrected according to the production line of the corresponding production location, and standardized and accurate solutions can be obtained. In actual implementation, the construction database of different tires can be used, which establishes a theoretical basis for accurate trial production, reduces the cost of tire research and development, shortens the cycle, and is also a key algorithm for the width of the forming drum in the intelligent construction design of tires.

[0077] 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 calculating the width of a tire building drum, characterized in that: This method uses the δ-c equation to calculate the width of the forming drum. The δ-c equation is composed of the following equations (1) and (2): （1） （2）； In equation (1) and equation (2), B s - Width of the forming drum, mm; L t -The required cord length between the crown center of the finished carcass cord layer and the wire bead diameter position, mm; L d - Required cord length for the curved part of the shoulder of the drum, mm; α0'-cutting angle of the first layer of cord on the forming drum, °; α0-cutting angle of semi-finished cord fabric, °; C-building drum shoulder curve width, mm; δ-cord assumed stretch; c1-Correction coefficient of finished tire cord length; c2-semi-finished cord cutting angle correction factor; c3-Correction coefficient of cord length of the shoulder curve of the forming drum; In the δ-c equation, the stretch δ affects the tire carcass cord length under ideal conditions and is the assumed design target; c1, c2, and c3 correct the deviation from the assumed target in the actual manufacturing process and are affected by the process capability and the carcass cord material itself; L t Calculate the cord length from the crown center of the finished carcass cord layer to the horizontal intersection of the wire bead diameter Db and the cord; L d Calculate the cord length from the radial starting point of the width C of the shoulder curve of the forming drum to the horizontal intersection of the wire ring diameter Db and the cord; the α0 cord cutting process is set in the range of 0° to 70°; the C value is a constant value obtained from the shoulder curve of the forming drum.

2. A method for correcting the width of a tire building drum, characterized in that: The method comprises the following steps: 1) According to the new tire design parameters, the assumed drum width is calculated by the δ-c equation described in claim 1 B s ; 2) Through the cord material of the new tire, the assumed value of δ, the ratio of the inner cord to the first layer of cord diameter, and the production line selection, a similar sample group in production was obtained in the construction database; 3) Substitute the tire parameters contained in the sample group into the δ-c equation and solve it through a computer program to obtain α0, c1, c2, c3; 4) Using the c1, c2, and c3 values ​​of a similar sample group on the actual production line, the δ-c equation is used to correct and calculate the width of the new tire forming drum.

3. A method for correcting the width of a tire building drum according to claim 2, characterized in that: According to the new tire section design parameters, similar sample groups are identified in the construction database. The number of group samples should be greater than or equal to 3.

4. A method for correcting the width of a tire building drum according to claim 2 or 3, characterized in that: The similarity of similar sample groups increases in the following order: 1) When the carcass cord materials are the same, The values ​​are similar; 2) Satisfy 1) and the tire diameter is close to the diameter of the first layer of cord; 3) Satisfy 2) and the processes of cutting, winding and unwinding the cord fabric are similar; 4) Satisfy 3) and the forming method and forming drum shoulder curve are consistent.

5. 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 the method according to any one of claims 1 to 4.

6. 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 described in any one of claims 1 to 4 is implemented.

7. 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 described in any one of claims 1 to 4 is implemented.

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