Method for designing width of belt ply of tire framework material semi-finished product

Abstract

The invention discloses a method for designing the width of a belt ply of a semi-finished product of a tire framework material. The method comprises the following steps: S1, establishing a database about change coefficients of similar products from semi-finished products to finished products; and S2, calling the database, inputting a belt ply finished product width design value, selecting classification parameters, calculating and analyzing whether difference values between the design values corresponding to finished products and semi-finished products of the same kind of products and actual measurement values exceed an allowable range or not, and outputting a change coefficient kn, a belt ply semi-finished product width design value Sn and an auxiliary drum perimeter Ca which meet requirements. Under the condition that the angle and density of the belt ply of a finished tire are not measured, after basic information of a product is input, the width variation of the belt ply semi-finished product is automatically estimated, so that the width value of each belt ply semi-finished product is obtained, the construction design efficiency and the product consistency are improved, the product development time is shortened, and the production cost is reduced. And the cost of repeated trial operation and test due to modification of the cutting width of the semi-finished product is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of tires, and in particular to a method for designing the width of a belt layer of a semi-finished tire skeleton material. Background Art

[0002] Tire components are different from mechanical parts. Most of them are made of rubber materials or cord-rubber composite materials with viscoelastic properties. During the manufacturing process, they are affected by various factors such as equipment, molds, molding methods, vulcanization time, and vulcanization temperature, which makes it difficult to accurately estimate the design size of semi-finished products. However, the construction design of semi-finished products is the basis for ensuring that the tire design drawings are converted into finished tires. The accuracy of the construction design directly affects the quality of the finished tires.

[0003] The design research of tire semi-finished products is the research on the conversion relationship between the design parameters of tire finished products and the construction design parameters. Most of the existing research on the design of tire semi-finished products focuses on the design research of the thickness of tire rubber components. For example:

[0004] Chinese invention patent CN113392479B discloses a method for designing the thickness dimension of a tire sidewall rubber semi-finished product, which calculates the thickness dimension of the sidewall semi-finished product based on the conversion relationship between the cross-sectional thickness dimension of the finished tire and the dimension on the semi-finished product forming drum.

[0005] Chinese invention patent CN108973536B discloses a design method for the thickness of the semi-finished product corresponding to the thinnest finished product of the passenger car tire airtight layer. According to the airtight performance requirements, the required thickness of the airtight layer of the thinnest finished product is determined, and the corresponding thickness of the airtight layer of the semi-finished product is calculated based on the thickness of the airtight layer, the crown tire body expansion rate, etc.

[0006] The width design of the semi-finished tire product above adopts the experience method of similar products, which has a large error. The cross-sectional dimensions of the finished product often do not meet the design tolerance requirements, resulting in repeated trials and high costs.

[0007] However, the reason why most of the design methods for the thickness of tire rubber components are currently being studied, and the design research of semi-finished tire skeleton material components is not involved, is because the skeleton components of the tire, such as the steel cord-rubber composite material of the belt layer of the full steel radial tire, usually have a certain angle and density to ensure the strength and stability of the tire. During the molding and vulcanization process from the semi-finished tire to the finished product, the angle and density of the skeleton material will change, allowing the outer diameter of the green tire to expand. Among these changes, the changes in the angle and density of the belt layer directly lead to changes in the belt layer width, and the belt layer width is closely related to the static and dynamic performance of the finished tire; at the same time, it is difficult to measure the changes in the angle and density of the belt layer of the finished tire.

[0008] It can be seen from this that how to estimate the width change of the semi-finished belt layer without measuring the angle and density of the finished tire belt layer is a very important research in order to improve construction design efficiency, product consistency, reduce product development time, and reduce the cost of repeated trials and tests due to modifying the cutting width of the semi-finished product. Summary of the invention

[0009] The technical problem to be solved by the present invention is how to estimate the width variation of the semi-finished belt layer without measuring the angle and density of the finished tire belt layer.

[0010] In order to solve the above technical problems, the present invention provides a method for designing the width of a belt layer of a semi-finished tire skeleton material, the method comprising the following steps:

[0011] S1. Establish a database on the coefficient of change of similar products from semi-finished products to finished products:

[0012] S11. Analyze and determine the classification parameters with significant influence between the design values ​​of the semi-finished products and the measured values ​​of the finished products of the same type of products based on the collected measured values ​​of the semi-finished products and the finished products, as well as the designed values ​​of the finished products of the same type of products;

[0013] S12, obtaining the mean values ​​of the coefficients of variation of several combinations of the classification parameters, inspecting and selecting the mean values ​​of the coefficients of variation that meet the requirements, and writing them into the database;

[0014] S2. Call the database, input the design value of the width of the finished belt layer, and automatically calculate the design value of the width of the semi-finished belt layer:

[0015] S21, calling the database, inputting the design value of the finished belt width, selecting the classification parameter, calculating and analyzing whether the difference between the design value and the measured value corresponding to the finished product and semi-finished product of the same product exceeds the allowable range, and outputting the variation coefficient k that meets the requirements n , the belt layer semi-finished product width design value S n and auxiliary drum circumference C a .

[0016] Furthermore, there are n belt layers from the inside to the outside of the tire radially, and the coefficient of change from the semi-finished product to the finished product of the nth belt layer is k. n , and satisfy the formula:

[0017]

[0018] Where n is a positive integer; OD is the design value of the tire outer diameter; H is the design value of the total thickness of the crown at the center of the crown; h1 is the design value of the total thickness of the inner liner at the center of the crown; h2 is the design value of the carcass thickness at the center of the crown; C ais the circumference of the auxiliary drum; t i is the design value of the thickness of the ith belt layer; t n is the design value of the thickness of the nth belt layer; d i is the measured value of the thickness of the semi-finished product ith belt layer; d n is the measured value of the thickness of the nth belt layer of the semi-finished product; a n Compensation coefficient for width change from semi-finished product to finished product of the nth belt layer;

[0019] The design value of the width of the semi-finished product of the nth belt layer is S n , and satisfy the formula:

[0020] S n =W n '*(1+k n )+c n

[0021] Among them, W n ' is the measured value of the width of the nth belt layer of the finished product; c n It is the compensation amount for the width change from the semi-finished product to the finished product of the nth belt layer.

[0022] Furthermore, the measured values ​​corresponding to the semi-finished products and finished products of the same type of products collected in S11, as well as the designed values ​​of the finished products of the same type of products, include:

[0023] Select typical products according to product type, and collect product identification information and finished product design parameter information;

[0024] The circumference of the tire forming auxiliary drum, the width and thickness of each layer of the semi-finished belt layer measured on the auxiliary drum, and the width and thickness of each layer of the belt layer of the finished tire section are collected respectively.

[0025] Furthermore, the product identification information includes product specifications and codes; the finished product design parameter information includes product pattern type, belt layer structure, and width and thickness values ​​of each layer of the finished product belt layer.

[0026] Furthermore, the S12 further includes:

[0027] The data collected and acquired by S11 is taken into the coefficient of variation k from the semi-finished belt layer to the finished product. n The width design value of each layer of the semi-finished belt layer is obtained from the formula;

[0028] The difference between the finished product design value and the finished product actual value, the semi-finished product design value, and the difference between the semi-finished product design value and the semi-finished product actual value are respectively verified;

[0029] Determine whether the difference between the design value and the measured value of the finished product and semi-finished product is within the allowable range. If the difference is within the allowable range, the verification is passed, and the change coefficient k of the belt layer from the semi-finished product to the finished product is directly obtained. n , Compensation for the change in width of the belt from semi-finished product to finished product c n , and the k n 、c n Write to the database; if the difference is not within the allowable range, the verification fails, and the change coefficient k from the semi-finished belt layer to the finished product is returned n formula and adjust the k n 、c n , until the verification is passed;

[0030] Performing regression analysis and correlation analysis on the multiple groups of data collected and acquired by S11 to find the classification parameters;

[0031] The k n 、c n The mean value of is brought into the coefficient of variation k from the semi-finished product to the finished product of the belt layer n The formula is verified by using the k n 、c n The mean of the designed finished products and semi-finished products is whether they meet the design requirements, and the k n 、c n The mean of is written into the database.

[0032] Furthermore, the analysis in S21 of whether the difference between the design value and the measured value corresponding to the finished product and the semi-finished product of the same product exceeds the allowable range includes:

[0033] If the difference exceeds the allowable range, the classification parameter range is reduced, and the analysis and verification are performed again;

[0034] If the difference does not exceed the allowable range, the requirement is met and the k is output. n 、c n , the belt layer semi-finished product width design value S n and auxiliary drum circumference C a .

[0035] Further, according to the database, the range of the variation coefficient from the semi-finished product to the finished product of the nth belt layer is -10% ≤ k n ≤10%.

[0036] Compared with the prior art, the present invention has the following beneficial effects:

[0037] The present invention provides a method for calculating the width value of a semi-finished belt layer of a skeleton component, and provides a tool, which can automatically estimate the width change of the semi-finished belt layer after inputting basic information of the product without measuring the angle and density of the belt layer of the finished tire, thereby obtaining the semi-finished width value of each belt layer, improving construction design efficiency and product consistency, reducing product development time, and reducing the cost of repeated trials and tests due to modifying the cutting width of the semi-finished product. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 This is a schematic diagram of the structure of the belt layer 4B disclosed in an embodiment of the present invention;

[0039] Figure 2 This is a schematic diagram of the structure of the belt layer 3B disclosed in an embodiment of the present invention;

[0040] Figure 3 It is an enlarged schematic diagram of the crown of the belt layer disclosed in an embodiment of the present invention;

[0041] Figure 4 This is a diagram of laying out a semi-finished belt layer auxiliary drum according to an embodiment of the present invention;

[0042] Figure 5 A flowchart of the database establishment part disclosed in the embodiment of the present invention;

[0043] Figure 6 A flowchart of the database calling part disclosed in the embodiment of the present invention;

[0044] Figure 7 A data table of a regression analysis case disclosed in an embodiment of the present invention;

[0045] Figure 8 This is a data table of a correlation analysis case disclosed in an embodiment of the present invention.

[0046] In the figure:

[0047] 1. Tire; 2. Tread; 3. Belt layer assembly; 31. First belt layer; 32. Second belt layer; 33. Third belt layer; 34. Fourth belt layer; 4. Carcass; 5. Inner liner assembly; 6. Bead; 7. Auxiliary drum. DETAILED DESCRIPTION

[0048] In order to make the technical scheme and technical effect of the present invention clearer, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0049] The present invention aims to provide a design method for the width of the belt layer of a semi-finished product of a tire frame material, and to provide a tool that can automatically calculate the width value of each semi-finished belt layer after inputting the basic information of the product, thereby solving the problem of inaccurate design of the belt layer width of tire frame components. Figure 5-6 , the method mainly comprises the following steps:

[0050] Step 1: Establish a database of the coefficient of variation of similar products from semi-finished products to finished products.

[0051] 1.1. Collect basic data: Select some typical products according to product types, and collect product identification information and finished product design parameter information; product identification information includes product specifications, codes, etc.; finished product design parameter information includes product pattern type, belt structure, width and thickness of each layer of finished belt layer, etc.;

[0052] 1.2. Collect measured data: collect the circumference of the tire building auxiliary drum, the width and thickness of each layer of the semi-finished belt layer measured on the auxiliary drum, and the width and thickness of each layer of the finished tire section belt layer;

[0053] 1.3. Verify the calculation results: Substitute the measured values ​​of the semi-finished products and finished products of the same type of products, as well as the design values ​​of the finished products of the same type of products, into the following formula to verify the calculation results. If the verification fails, return to adjust the constant item of the formula until the verification passes, and obtain the change coefficient k from the semi-finished product to the finished product of the belt layer n , Compensation for the change in width of the belt from semi-finished product to finished product c n Parameters are written into the database;

[0054] Among them, the change coefficient k from the semi-finished product to the finished product of the nth belt layer n The formula satisfies:

[0055]

[0056] Where n is a positive integer; OD is the design value of the tire outer diameter; H is the design value of the total thickness of the crown at the center of the crown; h1 is the design value of the total thickness of the inner liner at the center of the crown; h2 is the design value of the carcass thickness at the center of the crown; C a is the circumference of the auxiliary drum; t i is the design value of the thickness of the ith belt layer; t n is the design value of the thickness of the nth belt layer; d i is the measured value of the thickness of the semi-finished product ith belt layer; d n is the measured value of the thickness of the nth belt layer of the semi-finished product; a n Compensation coefficient for width change from semi-finished product to finished product of the nth belt layer.

[0057] Among them, the design value of the width of the semi-finished product of the nth belt layer is Sn The formula satisfies:

[0058] S n =W n '*(1+k n )+c n

[0059] Among them, W n ' is the measured value of the width of the nth belt layer of the finished product; c n It is the compensation amount for the width change from the semi-finished product to the finished product of the nth belt layer.

[0060] Specifically, refer to Figure 1 , 3 and 4, the belt layer has four layers, and is sequentially recorded as the first belt layer, the second belt layer, the third belt layer and the fourth belt layer from the inside to the outside along the radial direction of the tire;

[0061] The coefficients of variation from the semi-finished product to the finished product of the first, second, third and fourth belt layers are k1, k2, k3 and k4 respectively, which satisfy the formula:

[0062] k1=[(OD / 2-H+h1+h2+t1 / 2)*2-(C a / pi()+t1)] / (C a / pi()+d1)-a1

[0063] k2=[(OD / 2-H+h1+h2+t1+t2 / 2)*2-(C a / pi()+t1*2+t2)] / (C a / pi()+d1*2+d2)–a2

[0064] k3=[(OD / 2-H+h1+h2+t1+t2+t3 / 2)*2-(C a / pi()+t1*2+t2*2+t3)] / (C a / pi()+d1*2+d2*2+d3)-a3

[0065] k4=[(OD / 2-H+h1+h2+t1+t2+t3+t4 / 2)*2-(C a / pi()+t1*2+t2*2+t3*2+t4)] / (C a / pi()+d1*2+d2*2+d3*2+d4)-a4

[0066] Among them, OD is the design value of the tire outer diameter; H is the design value of the total thickness of the crown at the center of the crown; h1 is the design value of the total thickness of the inner liner at the center of the crown; h2 is the design value of the carcass thickness at the center of the crown; t1, t2, t3, t4 are the design values ​​of the first, second, third, and fourth belt layer thicknesses of the finished product respectively; Ca is the circumference of the auxiliary drum; d1, d2, d3, d4 are the measured values ​​of the thickness of the first, second, third and fourth belt layers of the semi-finished product respectively; a1, a2, a3, a4 are the compensation coefficients of the width change of the first, second, third and fourth belt layers from the semi-finished product to the finished product respectively;

[0067] The design values ​​of the width of the semi-finished product of the first, second, third and fourth belt layers are S1, S2, S3 and S4 respectively, which satisfy the formula:

[0068] S1=W1'*(1+k1)+c1

[0069] S2=W2'*(1+k2)+c2

[0070] S3=W3'*(1+k3)+c3

[0071] S4=W4'*(1+k4)+c4

[0072] Among them, W1', W2', W3', W4' are respectively the measured values ​​of the width of the first, second, third and fourth belt layers of the finished product; c1, c2, c3, c4 are respectively the compensation amounts for the width change from the semi-finished product to the finished product of the first, second, third and fourth belt layers.

[0073] Substitute the data collected and acquired in steps 1.1 and 1.2 into the formula of the variation coefficient of the belt layer from the semi-finished product to the finished product to obtain the width design value of each layer of the semi-finished belt layer; respectively verify the difference between the finished product design value and the finished product measured value, the semi-finished product design value, and the difference between the semi-finished product design value and the semi-finished product measured value; determine whether the difference between the design value and the measured value of the finished product and the semi-finished product is within the allowable range. If the difference is within the allowable range, it means that the verification is passed, and the variation coefficient k of the belt layer from the semi-finished product to the finished product is directly obtained. n , Compensation for the change in width of the belt from semi-finished product to finished product c n , and k n 、c n Write to the database; if the difference is not within the allowable range, it means that the verification has not passed, and the formula for the change coefficient of the belt layer from semi-finished product to finished product is returned and the parameter k is adjusted n 、c n , until the verification passes.

[0074] 1.4. Finding classification parameters: Perform regression analysis and correlation analysis on the multiple groups of finished product and semi-finished product data collected and collected in steps 1.1 and 1.2 to find classification parameters that have a significant impact on the verification results; the details are as follows:

[0075] 1.4.1. Regression analysis - taking the second belt layer as an example

[0076] refer to Figure 7It can be seen that the belt angle and pattern type are significant influencing factors for the design of the belt semi-finished product width.

[0077] 1.4.2. Correlation analysis - taking the second belt layer as an example

[0078] refer to Figure 8 , with the same source data as the regression analysis case, the correlation analysis results show that the design of the semi-finished belt width has a moderate linear correlation with the belt structure, belt direction, and belt angle, but no linear correlation with the pattern type.

[0079] Combining actual production with regression analysis and correlation analysis results, the database will use product specifications, belt structure, belt direction, belt angle, pattern type, etc. as classification parameters.

[0080] 1.5. Optimize k n 、c n Parameters: Get the mean of the coefficient of variation of several classification parameter combinations, test and select the mean of the coefficient of variation that meets the requirements and write it into the database; Specifically: k of different classification parameter combinations n 、c n The mean value of is substituted into the formula of the coefficient of variation from semi-finished product to finished product of the belt layer, and the calculation is carried out using k n 、c n The mean of the designed finished products and semi-finished products is whether they meet the design requirements, and the k n 、c n The mean value is written into the database.

[0081] Step 2: Call the database, input the design value of the finished belt width, and automatically calculate the design value of the semi-finished belt width.

[0082] 2.1. Call the database, input the design value of the finished belt width, select the classification parameters, and automatically calculate the width of the semi-finished belt of similar products;

[0083] 2.2. Check whether the difference between the design value and the measured value of the finished product and semi-finished product of the same product exceeds the allowable range. If the difference exceeds the allowable range, narrow the classification parameter range and re-analyze and check; if the difference does not exceed the allowable range, the requirement is met and output k n 、c n 、Design value of belt semi-finished product width S n and auxiliary drum circumference C a , that is, to realize the automatic calculation of the finished product design value to the semi-finished product design value of the belt layer width, and the deviation of the final result fluctuates within the allowable range.

[0084] In view of the above method, the present invention provides comparative examples, embodiment 1, embodiment 2, embodiment 3, embodiment 4, and embodiment 5 for comparative verification, wherein:

[0085] Comparative example: In the trial production of a 12R22.5 product, when designing the width of the semi-finished belt layer, it was determined based on experience that the semi-finished width ≈ the finished product design value + 0~20mm. The actual finished product section belt width is significantly different from the design value of the material distribution diagram, which exceeds the tolerance range of the design value, and the semi-finished product design value is too large.

[0086] Example 1: A 12R22.5 3B structure product, reference Figure 2 , the coefficient of variation k is calculated by taking the measured data of auxiliary drum circumference, finished belt layer and semi-finished belt layer into the formula n , it is concluded that: k1 ranges from -3% to 3%, preferably -1% to 1%; k2 ranges from 0% to 5%, preferably 2.5% to 3.5%; k3 ranges from 0% to 5%, preferably 2.0% to 3.5%. For the conventional structure of three-layer belt layer, the width change compensation coefficient a1 from semi-finished product to finished product is 0 to 5%, preferably 2.0% to 4.0%, c1 is preferably -5 to 5mm; a2 is preferably 0% to 3%, c2 is preferably -5 to 5mm; a3 is preferably 0% to 3%, c3 is preferably -5 to 5mm. The calculated value of the semi-finished belt layer is obtained, and the error between the calculated value and the measured value is small. The difference between the width of the finished section belt layer and the design value is also within the tolerance range.

[0087] Example 2: A 12R22.5 4B structure product, reference Figure 1 , substitute into the formula to calculate the coefficient of variation k n , it is concluded that: k1 ranges from -3% to 3%, preferably -1% to 1%; k2 ranges from 0% to 5%, preferably 2.5% to 3.5%; k3 ranges from 0% to 5%, preferably 2.0% to 3.5%; k4 ranges from 3% to 10%, preferably 5% to 8%. The width change compensation coefficient a1 from semi-finished product to finished product is 0 to 5%, preferably 2.0% to 3.5%, c1 is preferably -5 to 5mm; a2 is preferably 0% to 3%, c2 is preferably -5 to 5mm; a3 is preferably 0% to 3%, c3 is preferably -5 to 5mm; a4 is preferably 0% to 8%, c4 is preferably -10 to 10mm. The calculated value of the semi-finished belt layer is obtained, and the error between the calculated value and the measured value is small, and the difference between the width of the finished section belt layer and the design value is also within the tolerance range.

[0088] Example 3: A 12R22.5 4B structure product, its k n 、a n 、c n The selection range is the same as in Example 2.

[0089] Example 4: A 11R22.5 4B structure product, its k n 、a n 、c n The selection range is the same as in Example 2.

[0090] Example 5: A 315 / 80R22.5 4B structure product, its k n 、a n 、c n The selection range is the same as in Example 2.

[0091] The specific experimental parameters are shown in the following table:

[0092]

[0093]

[0094]

[0095] Preferably, the range of the coefficient of variation from the semi-finished product to the finished product of the nth belt layer is -10% ≤ k n ≤10%.

[0096] Specifically, the ranges of the coefficients of variation from the semi-finished product to the finished product of the first, second, third and fourth belt layers are:

[0097] -1%≤k1≤1%; 2.5%≤k2≤3.5%; 2.0%≤k3≤3.5%; 5%≤k4≤8%;

[0098] The ranges of width variation compensation coefficient and width variation compensation amount from semi-finished product to finished product of the first, second, third and fourth belt layers are as follows:

[0099] 2.0%≤a1≤3.5%, -5≤c1≤5mm;

[0100] 0%≤a2≤3%, -5≤c2≤5mm;

[0101] 0%≤a3≤3%, -5≤c3≤5mm;

[0102] 0%≤a4≤8%, -10≤c4≤10mm.

[0103] The present invention provides a method for calculating the width of a semi-finished belt layer of a skeleton component, and provides a tool, which can automatically calculate the width value of each semi-finished belt layer after inputting basic information of the product, thereby improving the design accuracy of the tire belt layer width.

[0104] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for designing the width of a belt layer of a semi-finished tire skeleton material, characterized in that: The method comprises the following steps: S1. Establish a database on the coefficient of change of similar products from semi-finished products to finished products: S11. Analyze and determine the classification parameters with significant influence between the design values ​​of the semi-finished products and the measured values ​​of the finished products of the same type of products based on the collected measured values ​​of the semi-finished products and the finished products, as well as the designed values ​​of the finished products of the same type of products; S12, obtaining the mean values ​​of the coefficients of variation of several combinations of the classification parameters, inspecting and selecting the mean values ​​of the coefficients of variation that meet the requirements, and writing them into the database; S2. Call the database, input the design value of the width of the finished belt layer, and automatically calculate the design value of the width of the semi-finished belt layer: S21, calling the database, inputting the design value of the finished belt width, selecting the classification parameter, calculating and analyzing whether the difference between the design value and the measured value corresponding to the finished product and semi-finished product of the same product exceeds the allowable range, and outputting the variation coefficient k that meets the requirements n , the belt layer semi-finished product width design value S n and auxiliary drum circumference C a .

2. The method for designing the width of the belt layer of the semi-finished tire frame material according to claim 1, characterized in that: There are n belt layers from the inside to the outside of the tire radially, and the coefficient of change from the semi-finished product to the finished product of the nth belt layer is k. n , and satisfy the formula: Where n is a positive integer; OD is the design value of the tire outer diameter; H is the design value of the total thickness of the crown at the center of the crown; h1 is the design value of the total thickness of the inner liner at the center of the crown; h2 is the design value of the carcass thickness at the center of the crown; C a is the circumference of the auxiliary drum; t i is the design value of the thickness of the i-th belt layer; t n is the design value of the thickness of the nth belt layer; d i is the measured value of the thickness of the semi-finished product ith belt layer; d n is the measured value of the thickness of the nth belt layer of the semi-finished product; a n Compensation coefficient for width change from semi-finished product to finished product of the nth belt layer; The design value of the width of the semi-finished product of the nth belt layer is S n , and satisfy the formula: S n =W n ’*(1+k n )+c n Among them, W n ' is the measured value of the width of the nth belt layer of the finished product; c n It is the compensation amount for the width change from the semi-finished product to the finished product of the nth belt layer.

3. The method for designing the width of the belt layer of the semi-finished tire frame material according to claim 2, characterized in that: The measured values ​​of the semi-finished products and finished products of the same type collected in S11, and the designed values ​​of the finished products of the same type, include: Select typical products according to product type, and collect product identification information and finished product design parameter information; The circumference of the tire forming auxiliary drum, the width and thickness of each layer of the semi-finished belt layer measured on the auxiliary drum, and the width and thickness of each layer of the belt layer of the finished tire section are collected respectively.

4. The method for designing the width of the belt layer of the semi-finished tire frame material according to claim 3, characterized in that: The product identification information includes product specifications and codes; The finished product design parameter information includes product pattern type, belt layer structure, and width and thickness values ​​of each layer of the finished product belt layer.

5. The method for designing the width of the belt layer of the semi-finished tire frame material according to claim 3, characterized in that: The S12 further includes: The data collected and acquired by S11 is taken into the coefficient of variation k from the semi-finished belt layer to the finished product. n The width design value of each layer of the semi-finished belt layer is obtained from the formula; The difference between the finished product design value and the finished product actual value, the semi-finished product design value, and the difference between the semi-finished product design value and the semi-finished product actual value are respectively verified; Determine whether the difference between the design value and the measured value of the finished product and semi-finished product is within the allowable range. If the difference is within the allowable range, the verification is passed, and the change coefficient k of the belt layer from the semi-finished product to the finished product is directly obtained. n , Compensation for the change in width of the belt from semi-finished product to finished product c n , and the k n 、c n Write to the database; if the difference is not within the allowable range, the verification fails, and the change coefficient k from the semi-finished belt layer to the finished product is returned n formula and adjust the k n 、c n , until the verification is passed; Performing regression analysis and correlation analysis on the multiple groups of data collected and acquired by S11 to find the classification parameters; The k n 、c n The mean value of is brought into the coefficient of variation k from the semi-finished product to the finished product of the belt layer n The formula is verified by using the k n 、c n The mean of the designed finished products and semi-finished products is whether they meet the design requirements, and the k n 、c n The mean of is written into the database.

6. The method for designing the width of the belt layer of the semi-finished tire frame material according to claim 5, characterized in that: The analysis in S21 of whether the difference between the design value and the measured value corresponding to the finished product and the semi-finished product of the same product exceeds the allowable range includes: If the difference exceeds the allowable range, the classification parameter range is reduced, and the analysis and verification are performed again; If the difference does not exceed the allowable range, the requirement is met and the k is output. n 、c n , the belt layer semi-finished product width design value S n and auxiliary drum circumference C a .

7. The method for designing the width of the belt layer of the semi-finished tire frame material according to claim 2, characterized in that: According to the database, the range of the coefficient of variation from the semi-finished product to the finished product of the nth belt layer is -10% ≤ k n ≤10%.

Images