A method of predicting a wafer periphery

Abstract

The application relates to a method for predicting the outer circumference of a tire embryo, belonging to the technical field of tire manufacturing, which comprises the following steps: according to the structural design scheme of a tire product, extracting structural information and structural parameters; according to the extracted structural parameters, respectively calculating the circumference of a belt fitting drum and the outer circumference of an initial two-section tire embryo; and according to the calculated outer circumference of the initial two-section tire embryo and the structural information, calculating the theoretical prediction value of the outer circumference of the tire embryo. The application can predict the outer circumference of the tire embryo in advance through calculation, lays a foundation for comparing the difference between the theoretical prediction value of the outer circumference of the tire embryo and the inner circumference of the live link, judges whether the difference meets the design requirement, shortens the design and optimization cycle of the tire product, has high prediction precision, and avoids repeated optimization processes.

Description

Technical Field

[0001] This invention belongs to the field of tire manufacturing technology, and specifically relates to a method for predicting the outer circumference of a tire embryo. Background Technology

[0002] The tire manufacturing process generally includes processes such as mixing, rubber component preparation, molding, and vulcanization. The mixing process involves mixing raw materials such as carbon black, natural / synthetic rubber, oil, additives, and accelerators to form a rubber compound. The rubber component preparation process involves extruding, calendering, and molding the rubber compound to obtain all the semi-finished rubber components used to make up the tire. The molding process involves assembling all the semi-finished rubber components into a tire carcass, or green tire, using a molding machine. The vulcanization process involves vulcanizing the tire carcass into a finished product using a vulcanizing machine.

[0003] Tire appearance, dynamic balance, and uniformity test parameters must meet national or international standards. The quality of the molding process directly affects the tire's appearance, dynamic balance, and uniformity; specifically, the outer perimeter of the tire carcass directly impacts these aspects. For example, the document "Uniformity Testing and Influencing Factors of All-Steel Radial Truck Tires" specifically discloses that the main factors affecting radial force fluctuations in tires include incorrect setting of the bonding drum circumference, which leads to changes in the tire carcass circumference. Similarly, the document "Uniformity of Semi-Steel Tires" specifically discloses that cord stretching factor K1 and carcass expansion factor K2 have a significant impact on tire uniformity, where K2 = L / (L' + 2πh), where L represents the outer perimeter of the tire carcass and L' represents the circumference of the belt layer bonding drum. Once the structure of a tire product is determined, the outer circumference of the tire blank is also basically determined under standard manufacturing processes and specific equipment conditions. Currently, domestic tire companies mainly rely on experience values ​​to estimate the outer circumference of the tire blank based on the structure of the tire product, which cannot guarantee the accuracy of the estimation. At the same time, due to the low estimation accuracy, the construction plan needs to be repeatedly modified until it is optimal, which prolongs the design and optimization cycle of tire products. Summary of the Invention

[0004] In view of the various shortcomings of existing technologies, and in order to solve the above problems, a method for predicting the outer perimeter of the embryo is proposed.

[0005] To achieve the above objective, the present invention provides a method for predicting the circumference of an embryo, comprising the following steps:

[0006] Based on the structural design scheme of the tire product, structural information and structural parameters are extracted. The structural design scheme includes structural information and structural parameters. The structural information includes the winding method of the crown strip, the model of the forming machine, and the tire product category. The structural parameters include the size of the swivel mold, the thickness of the tread, the thickness of the belt layer, and the thickness of the crown layer.

[0007] According to the extracted structure parameters, the circumference of the belt building drum and the outer circumference of the initial two-section tire blank are calculated respectively, the outer circumference of the initial two-section tire blank being the circumference of the center position of the tread in the un-inflated state after the tread, the crown belt, and the belt building drum are attached to the surface of the belt building drum;

[0008] According to the calculated outer circumference of the initial two-section tire blank and the structure information, a theoretical prediction value of the outer circumference of the tire blank is calculated.

[0009] Further, according to the extracted structure parameters, the circumference of the belt building drum and the outer circumference of the initial two-section tire blank are calculated respectively, specifically:

[0010] According to the size of the flexible mold, the circumference of the belt building drum is calculated;

[0011] According to the calculated circumference of the belt building drum, the thickness of the tread, the thickness of the belt, and the thickness of the crown belt, the outer circumference of the initial two-section tire blank is calculated.

[0012] Further, according to the size of the flexible mold, the circumference of the belt building drum is calculated, specifically:

[0013] In the flexible mold vulcanization mode, the diameter of the belt building drum = [MOD-2 (MGD+UTG+0.9 JLB)-1.25 BELT] / n-BELT, wherein MOD represents the outer diameter of the flexible mold, MGD represents the pattern groove depth on the flexible mold, UTG represents the pattern groove bottom glue thickness on the flexible mold, BELT represents the thickness of the belt, JLB represents the thickness of the crown belt, and n represents the inflation rate of the belt building drum, when the tire product is designed with a crown belt, the inflation rate of the belt building drum is 2.5%-3.5%, and when the tire product is designed without a crown belt, the inflation rate of the belt building drum is 2.5%-4.0%;

[0014] The circumference of the belt building drum = the diameter of the belt building drum 3.14.

[0015] Further, according to the calculated circumference of the belt building drum, the thickness of the tread, the thickness of the belt, and the thickness of the crown belt, the outer circumference of the initial two-section tire blank is calculated, specifically:

[0016] When the tire product is designed to form a crown belt by winding a crown belt strip, the outer circumference of the initial two-section tire blank = the circumference of the belt building drum + (BELT 2+JLB+T / D) 2 3.14, wherein BELT represents the thickness of the belt, T / D represents the thickness of the tread, and JLB represents the thickness of the crown.

[0017] Further, according to the calculated circumference of the belt building drum, the thickness of the tread, the thickness of the belt, and the thickness of the crown, the outer circumference of the initial two-section tire blank is calculated, specifically as follows:

[0018] When the tire product is designed without a crown, the outer circumference of the initial two-section tire blank = the circumference of the belt building drum + (BELT 2+T / D) 2 3.14, wherein BELT represents the thickness of the belt, and T / D represents the thickness of the tread.

[0019] Further, according to the calculated outer circumference of the initial two-section tire blank and the structure information, a theoretical prediction value of the outer circumference of the tire blank is calculated, specifically as follows:

[0020] When the forming machine model adopts a passenger radial tire one-step forming machine, according to the winding method of the crown strip and the tire product category, the outer circumference of the tire blank is calculated using the calculated outer circumference of the initial two-section tire blank, to obtain a theoretical prediction value of the outer circumference of the tire blank;

[0021] When the forming machine model adopts a two-step forming machine, according to the winding method of the crown strip and the tire product category, the outer circumference of the tire blank is calculated using the calculated outer circumference of the initial two-section tire blank, to obtain a theoretical prediction value of the outer circumference of the tire blank.

[0022] Further, when the forming machine model adopts a passenger radial tire one-step forming machine, the outer circumference of the initial two-section tire blank is denoted as A, and the theoretical prediction value of the outer circumference of the tire blank is denoted as B, then:

[0023] For tire products with an inch ≤ 16 inches and a flat ratio ≥ 55, when the crown strip adopts one-end-one-tail type winding one layer or one-end-one-tail type winding one layer combined with two-end-two-tail type winding one layer, B = -47.40 + 1.033A;

[0024] For tire products with an inch > 16 inches and a flat ratio < 55, when the crown strip adopts one-end-one-tail type winding one layer, B = -85.53 + 1.048A;

[0025] For tire products with a flat ratio ≥ 60 and a section width ≥ 225 mm, when the crown strip adopts one-end-one-tail type winding one layer, B = A + (23-26), and when the crown strip adopts one-end-one-tail type winding one layer combined with two-end-two-tail type winding one layer, B = 10.5 + 1.006 A, when the crown strip is wound in one head and one tail style for two layers or one head and one tail style for two layers combined with two head and two tail style for one layer, B = 1.68 + 1.007A;

[0026] For the load radial tire, when the crown strip is wound in one head and one tail style for one layer, B = -28.60 + 1.022A, when the crown strip is wound in one head and one tail style for one layer combined with two head and two tail style for one layer, B = 5.71 + 1.006 A, when the crown strip is wound in two head and two tail style for one layer or the tire product has no crown strip layer, B = -12.59 + 1.024A, when the crown strip is wound in one head and one tail style for two layers or one head and one tail style for two layers combined with two head and two tail style for one layer, B = 30.73 + 0.9891A;

[0027] For the passenger car radial tire, when the crown strip is wound in two head and two tail style for one layer or the tire product has no crown strip layer, B = -12.59 + 1.024A.

[0028] Further, when the forming machine model adopts a secondary forming machine, the initial outer circumference of the two-section tire blank is denoted as A, and the theoretical prediction value of the tire blank outer circumference is denoted as B, then:

[0029] For the tire product with inch ≤ 16 inches and flat ratio ≥ 55, when the crown strip is wound in one head and one tail style for one layer, B = -16.11 + 1.011A;

[0030] For the tire product with inch > 16 inches and flat ratio < 55, when the crown strip is wound in one head and one tail style for one layer, B = -85.53 + 1.048A;

[0031] For the tire product with flat ratio ≥ 60 and section width ≥ 225 mm, when the crown strip is wound in one head and one tail style for one layer, B = A + (9-11);

[0032] For the load radial tire, when the crown strip is wound in one head and one tail style for one layer, B = -22.88 + 1.014A, when the crown strip is wound in one head and one tail style for one layer combined with two head and two tail style for one layer, B = -37.75 + 1.020A, when the crown strip is wound in two head and two tail style for one layer or the tire product has no crown strip layer, B = -12.59 + 1.024A, when the crown strip is wound in one head and one tail style for two layers or one head and one tail style for two layers combined with two head and two tail style for one layer, B = -34.51 + 1.013A;

[0033] For the semi-steel radial tire, when the crown strip is wound in one head and one tail style for one layer combined with two head and two tail style for one layer, B = -16.66 + 1.012A;

[0034] For the passenger car radial tire, when the crown belt strip is wound in a two-end two-tail mode for one layer or the tire product has no crown belt layer, B = -12.59 + 1.024A.

[0035] Further, the difference between the theoretical predicted value of the outer circumference of the tire blank and the inner circumference of the forming drum is compared, and if the difference is between 10-20mm, it means that it meets the design requirements of the product, otherwise, the inflation rate of the belt fitting drum is adjusted, the circumference of the belt fitting drum is re-determined, and the difference is located between 10-20mm until the difference is located between 10-20mm.

[0036] The beneficial effects of the present application are:

[0037] 1. The outer circumference of the tire blank can be predicted in advance through calculation, which lays a foundation for comparing the difference between the theoretical predicted value of the outer circumference of the tire blank and the inner circumference of the forming drum, so as to judge whether the difference meets the design requirements, and shorten the design and optimization cycle of the tire product.

[0038] 2. The correlation between the outer circumference of the tire blank and the circumference of the belt fitting drum is determined, which provides a design reference principle for tire product engineers.

[0039] 3. The calculation accuracy can be improved to more than 95%, avoiding repeated modification and verification of product design and construction, improving product development efficiency and development quality, and at the same time, avoiding waste of trial production resources.

[0040] 4. The calculation can be selected according to the winding mode of the crown belt strip, the type of the forming machine and the type of the tire product, and has strong universality. BRIEF DESCRIPTION OF DRAWINGS

[0041] Figure 1 is a flow chart of the present application;

[0042] Figure 2 is a structural schematic diagram of the crown belt strip winding mode;

[0043] Figure 3 is an assembly schematic diagram of the tread, crown belt layer, belt layer and belt fitting drum. DETAILED DESCRIPTION

[0044] In order for those skilled in the art to better understand the technical solutions of the present application, the technical solutions of the present application will be described clearly and completely below in combination with the drawings of the present application. Based on the embodiments in the present application, other similar embodiments obtained by those skilled in the art without creative labor shall belong to the scope of protection of the present application. In addition, the directional words mentioned in the following embodiments, such as "up", "down", "left", "right" and the like are only reference directions of the drawings, therefore, the directional words used are used to illustrate but not limit the present application.

[0045] Example 1:

[0046] As Figure 1 shown, a method for predicting the outer circumference of a tire embryo, comprising the following steps:

[0047] S100, extracting structure information and structure parameters according to the structure design scheme of the tire product, the structure design scheme comprising structure information and structure parameters, the structure information comprising the winding mode of the crown strip, the type of the building machine and the category of the tire product, and the structure parameters comprising the size of the drum, the thickness of the tread, the thickness of the belt and the thickness of the crown strip.

[0048] As Figure 2 shown, the winding mode of the crown strip has one-end one-tail type, two-end two-tail type and combination of the two, wherein 1JEC represents one layer of two-end two-tail winding, 1JFC represents one layer of one-end one-tail winding, 2JFC represents two layers of one-end one-tail winding, 1JFC+1JEC represents combination of one layer of one-end one-tail winding and one layer of two-end two-tail winding, and 2JFC+1JEC represents combination of two layers of one-end one-tail winding and one layer of two-end two-tail winding.

[0049] The type of the building machine comprises passenger radial tire one-step building machine (PS2A) and two-step building machine, and the category of the tire product comprises car tire product with inch≤16 inch and flat ratio≥55 (HP), ultra-high performance tire product with inch>16 inch and flat ratio<55 (UHP), SUV product with flat ratio≥60 and section width≥225 mm, and load radial tire product (LTR).

[0050] S200, calculating the circumference of the belt building drum and the outer circumference of the initial two-section tire embryo according to the extracted structure parameters, as Figure 3 shown, the outer circumference of the initial two-section tire embryo is the circumference of the center position of the tread in the un-inflated state after the tread, the crown strip and the belt are attached to the surface of the belt building drum, wherein the crown strip is wound to form the crown strip.

[0051] The outer circumference of the initial two-section tire embryo takes into account the attachment mode, material thickness and other factors, and the main difference between the outer circumference of the tire embryo and the outer circumference of the initial two-section tire embryo is the tire embryo inflation rate, which is relatively stable for a specific winding mode of the crown strip, type of the building machine and category of the tire product, therefore, the inventors predict the outer circumference of the tire embryo by using the outer circumference of the initial two-section tire embryo.

[0052] S300, calculating the theoretical prediction value of the outer circumference of the tire embryo according to the calculated outer circumference of the initial two-section tire embryo and the structure information.

[0053] In the tire forming process, the circumference of the belt fitting drum is determined according to the belt expansion ratio, which affects the tire footprint, stability, high-speed durability and other performances. Once the circumference of the belt fitting drum is determined, it is not easy to adjust, otherwise it needs to be verified comprehensively, which reduces the efficiency of new product production. Therefore, for a specific tire product structure, a specific forming machine model, and under standard process conditions, once the circumference of the belt fitting drum is determined, the outer circumference of the tire blank is also determined, that is, there is a specific correlation between the outer circumference of the tire blank and the circumference of the belt fitting drum.

[0054] Preferably, according to the extracted structure parameters, the circumference of the belt fitting drum and the outer circumference of the initial two-section tire blank are calculated respectively, including the following steps:

[0055] S201, according to the size of the movable die, the circumference of the belt fitting drum is calculated.

[0056] Specifically, in the movable die vulcanization mode, the diameter of the belt fitting drum is = [MOD-2 (MGD+UTG+0.9 JLB)-1.25 BELT] / n-BELT, wherein MOD represents the outer diameter of the movable die, MGD represents the pattern groove depth on the movable die, UTG represents the pattern groove bottom glue thickness on the movable die, BELT represents the thickness of the belt, JLB represents the thickness of the crown belt, and n represents the expansion rate of the belt fitting drum. When the tire product is designed to have a crown belt, the expansion rate of the belt fitting drum is 2.5%-3.5%, and when the tire product is designed to have no crown belt, the expansion rate of the belt fitting drum is 2.5%-4.0%;

[0057] The circumference of the belt fitting drum = the diameter of the belt fitting drum 3.14.

[0058] S202, according to the calculated circumference of the belt fitting drum, the thickness of the tread, the thickness of the belt and the thickness of the crown belt, the outer circumference of the initial two-section tire blank is calculated.

[0059] Specifically, when the tire product is designed to have a crown belt formed by winding the crown belt strip, the outer circumference of the initial two-section tire blank = the circumference of the belt fitting drum + (BELT 2+JLB+T / D) 2 3.14, wherein BELT represents the thickness of the belt, T / D represents the thickness of the tread, and JLB represents the thickness of the crown belt.

[0060] Specifically, when the tire product is designed to have no crown belt, the outer circumference of the initial two-section tire blank = the circumference of the belt fitting drum + (BELT 2+T / D) 2 3.14, where BELT represents the thickness of the belt, and T / D represents the thickness of the tread.

[0061] Preferably, a theoretical prediction value of the outer circumference of the tire blank is calculated according to the calculated initial outer circumference of the second-stage tire blank and the structure information, and specifically, the theoretical prediction value of the outer circumference of the tire blank is calculated according to the following formula:

[0062] In the first aspect, when the forming machine is a passenger radial tire one-step forming machine, the outer circumference of the tire blank is calculated according to the calculated initial outer circumference of the second-stage tire blank, according to the winding mode of the crown strip and the tire product category, to obtain a theoretical prediction value of the outer circumference of the tire blank.

[0063] Specifically, the outer circumference of the initial second-stage tire blank is denoted as A, and the theoretical prediction value of the outer circumference of the tire blank is denoted as B, and then:

[0064] For tire products with an inch ≤ 16 inches and a flat ratio ≥ 55, when the crown strip is wound in one head and one tail for one layer or one head and one tail for one layer combined with two heads and two tails for one layer, B = -47.40 + 1.033A.

[0065] For tire products with an inch > 16 inches and a flat ratio < 55, when the crown strip is wound in one head and one tail for one layer, B = -85.53 + 1.048A.

[0066] For tire products with a flat ratio ≥ 60 and a section width ≥ 225 mm, when the crown strip is wound in one head and one tail for one layer, B = A + (23-26), and when the crown strip is wound in one head and one tail for one layer combined with two heads and two tails for one layer, B = 10.5 + 1.006 A, and when the crown strip is wound in one head and one tail for two layers or one head and one tail for two layers combined with two heads and two tails for one layer, B = 1.68 + 1.007A.

[0067] For load radial tires, when the crown strip is wound in one head and one tail for one layer, B = -28.60 + 1.022A, and when the crown strip is wound in one head and one tail for one layer combined with two heads and two tails for one layer, B = 5.71 + 1.006 A, and when the crown strip is wound in one head and one tail for two layers or one head and one tail for two layers combined with two heads and two tails for one layer, B = 30.73 + 0.9891A.

[0068] For passenger radial tires, when the crown strip is wound in two heads and two tails for one layer or the tire product has no crown strip, B = -12.59 + 1.024A.

[0069] The second aspect, when the forming machine model adopts a secondary forming machine, according to the winding mode of the crown strip and the tire product category, the theoretical prediction value of the tire blank outer circumference is obtained by calculating the initial two-section tire blank outer circumference.

[0070] Specifically, the outer circumference of the initial two-section tire blank is denoted as A, and the theoretical prediction value of the tire blank outer circumference is denoted as B, then:

[0071] For tire products with inch≤16 inches and flat ratio≥55, when the crown strip is wound in one head and one tail type for one layer, B=-16.11+1.011A;

[0072] For tire products with inch>16 inches and flat ratio<55, when the crown strip is wound in one head and one tail type for one layer, B=-85.53+1.048A;

[0073] For tire products with flat ratio≥60 and cross-sectional width≥225mm, when the crown strip is wound in one head and one tail type for one layer, B=A+(9-11);

[0074] For load radial tire, when the crown strip is wound in one head and one tail type for one layer, B=-22.88+1.014A, when the crown strip is wound in one head and one tail type for one layer and two head and two tail type for one layer, B=-37.75+1.020A, when the crown strip is wound in two head and two tail type for one layer or the tire product has no crown strip layer, B=-12.59+1.024A, when the crown strip is wound in one head and one tail type for two layers or one head and one tail type for two layers and two head and two tail type for one layer, B=-34.51+1.013A;

[0075] For semi-steel radial tire, when the crown strip is wound in one head and one tail type for one layer and two head and two tail type for one layer, B=-16.66+1.012A;

[0076] For passenger car radial tire, when the crown strip is wound in two head and two tail type for one layer or the tire product has no crown strip layer, B=-12.59+1.024A.

[0077] Under the premise of distinguishing different crown band winding methods, tire products and forming machine types, the inventor preliminarily judges whether there is a regular relationship between the outer circumference of the tire blank and the outer circumference of the initial second-stage tire blank through field tracking test, statistical summary of a large amount of data, data dispersion analysis, linear regression equation fitting, setting the outer circumference of the initial second-stage tire blank as the independent variable and the outer circumference of the tire blank as the dependent variable, opening the Minitab software, menu selection "statistics-regression-fitting equation", linear fitting, confirmation of whether the R-Sq value is greater than 80%, if the decision coefficient R-Sq value is greater than 80%, it means that the linear regression is effective, and then the calculation formula of the outer circumference of the tire blank and the outer circumference of the initial second-stage tire blank is determined.

[0078] In the tire product construction design, according to the size and expansion rate of the flexible mold, the belt fitting drum circumference is determined, and then the outer circumference of the initial second-stage tire blank and the theoretical prediction value of the outer circumference of the tire blank are calculated in turn. The difference between the theoretical prediction value of the outer circumference of the tire blank and the inner circumference of the flexible mold is compared, and according to the product research and development design requirement: the difference between the theoretical prediction value of the outer circumference of the tire blank and the inner circumference of the flexible mold should be between 10-20mm, if the difference is between 10-20mm, it means that the design requirement is met, otherwise, it means that the design requirement is not met, and the product design process needs to be re-discussed and the belt fitting drum circumference design needs to be optimized. Specifically, according to the belt fitting drum circumference calculation formula, the belt fitting drum circumference is optimized by adjusting the expansion rate, and the expansion rate is an interval range, which fully meets the adjustment requirement.

[0079] In the traditional new product design, the estimation of the outer circumference of the tire blank by experience value belongs to the fuzzy design category, and the design requirement cannot be met with a high probability, so the construction needs to be modified twice. Through the tire blank outer circumference prediction method disclosed by the present application, the outer circumference of the tire blank can be predicted in advance, and the prediction accuracy can be improved to more than 95%, which avoids the secondary modification and verification of product construction, improves the product development efficiency and development quality.

[0080] Example two:

[0081] The same parts of this embodiment and example one are not repeated, and the difference is:

[0082] For the tire product of 185 / 65R14 QP10000520B, the crown strip is wound in one-head and one-tail mode with one layer, the PS2A forming machine, the crown strip layer thickness is 0.80mm, the belt layer thickness is 1.13mm, the tire tread thickness is 7.65mm, the belt layer fitting drum circumference is 1727mm, the initial two-section tire blank outer circumference is 1794.3mm, according to the formula B=-47.40+1.033A, the tire blank outer circumference theoretical prediction value is 1806.1mm, the tire blank outer circumference actual measurement value is 1809mm, the difference is 2.9mm, the actual measurement value is within the tire blank outer circumference theoretical prediction value±3mm range.

[0083] According to the product research and development design theory, as long as the actual measurement value is within the tire blank outer circumference theoretical prediction value±5mm range, it indicates that the calculation formula is correct and effective, and the effective rate reaches more than 95%.

[0084] The above has made a detailed description of the present application, the above is only the preferred embodiment of the present application, and cannot limit the scope of the present application, that is, any equivalent change and modification made within the scope of the present application should still fall within the scope of the present application.

Claims

1. A method for predicting the circumference of an embryo, characterized in that, Includes the following steps: Based on the structural design scheme of the tire product, structural information and structural parameters are extracted. The structural design scheme includes structural information and structural parameters. The structural information includes the winding method of the crown strip, the model of the forming machine, and the tire product category. The structural parameters include the size of the swivel mold, the thickness of the tread, the thickness of the belt layer, and the thickness of the crown layer. Based on the extracted structural parameters, the circumference of the belt layer bonding drum and the outer circumference of the initial two-section tire embryo are calculated respectively. The outer circumference of the initial two-section tire embryo is the circumference of the center position of the tread after the tread, crown layer and belt layer are bonded to the surface of the belt layer bonding drum, in the unexpanded state. Diameter of the belt-bonded drum = [MOD-2] (MGD+UTG+0.9 JLB)-1.25 BELT] / n-BELT, where MOD represents the outer diameter of the flexible mold, MGD represents the depth of the groove on the flexible mold, UTG represents the thickness of the adhesive at the bottom of the groove on the flexible mold, BELT represents the thickness of the belt layer, JLB represents the thickness of the crown layer, and n represents the expansion rate of the belt layer bonding drum. The circumference of the belt-laminated drum = the diameter of the belt-laminated drum 3.14; When a tire product is designed with a crown belt layer, the outer perimeter of the initial two-stage tire carcass = the perimeter of the belt layer bonding drum + (BELT) 2+JLB+T / D) 2 3.14, where T / D represents the tread thickness; when the tire product is designed as a crownless belt layer, the outer perimeter of the initial two-stage tire blank = the perimeter of the belt layer bonding drum + (BELT) 2+T / D) 2 3.14; Based on the molding machine model, crown strip winding method, and tire product category in the structural information, a target relational expression corresponding to the structural information is selected from a predetermined set of linear relational expressions relating the outer perimeter of the initial two-stage tire blank to the theoretical predicted value of the tire blank outer perimeter. The calculated outer perimeter of the initial two-stage tire blank is then substituted into the target relational expression to calculate the theoretical predicted value of the tire blank outer perimeter.

2. The method for predicting the circumference of an embryo according to claim 1, characterized in that, When a tire product is designed to have a crown belt layer formed by winding crown belt strips, the expansion rate of the belt layer bonding drum is 2.5%-3.5%. When a tire product is designed without a crown belt layer, the expansion rate of the belt layer bonding drum is 2.5%-4.0%.

3. The method for predicting the circumference of an embryo according to claim 1, characterized in that, When the molding machine is a one-step molding machine for passenger radial tires, the outer perimeter of the initial two-stage tire blank is denoted as A, and the theoretical predicted value of the outer perimeter of the tire blank is denoted as B. Then: For tire products with an inch ≤ 16 inches and an aspect ratio ≥ 55, when the crown strip is wrapped in one layer at one end or in combination with a combination of one layer at one end and one layer at both ends, B = -47.40 + 1.033A. For tire products with an inch greater than 16 inches and an aspect ratio less than 55, when the crown strip is wrapped in one layer at each end, B = -85.53 + 1.048A. For tires with an aspect ratio ≥ 60 and a section width ≥ 225 mm, when the crown belt is wound in a one-end-one-layer manner, B = A + (23 - 26). When the crown belt is wound in a combination of one-end-one-layer and two-end-two-layer methods, B = 10.5 + 1.

006. A, When the crown band is wrapped in two layers with one end and one end, or a combination of two layers with one end and one end and one layer with two ends and one end, B = 1.68 + 1.007A; For heavy-duty radial tires, when the crown belt is wound in a one-end-one-layer pattern, B = -28.60 + 1.022A; when the crown belt is wound in a combination of one-end-one-layer and two-end-two-layer patterns, B = 5.71 + 1.

006. A, When the crown belt is wrapped in one layer at both ends or the tire product has no crown belt layer, B=-12.59+1.024A; When the crown belt is wrapped in two layers at one end or a combination of two layers at one end and one end and one layer at both ends, B=30.73+0.9891A. For radial passenger car tires, when the crown strip is wrapped in a two-end, two-end pattern or the tire product has no crown strip layer, B = -12.59 + 1.024A.

4. The method for predicting the circumference of an embryo according to claim 1, characterized in that, When the molding machine adopts a two-stage molding method, the outer perimeter of the initial two-stage embryo is denoted as A, and the theoretical predicted value of the outer perimeter of the embryo is denoted as B. Then: For tire products with an inch ≤ 16 inches and an aspect ratio ≥ 55, when the crown strip is wound in one layer at each end, B = -16.11 + 1.011A; For tire products with an inch greater than 16 inches and an aspect ratio less than 55, when the crown strip is wrapped in one layer at each end, B = -85.53 + 1.048A. For tire products with an aspect ratio ≥ 60 and a cross-sectional width ≥ 225 mm, when the crown strip is wrapped in one layer at each end, B = A + (9-11); For heavy-duty radial tires, when the crown belt is wound in one-end-one-end pattern with one layer, B = -22.88 + 1.014A; when the crown belt is wound in one-end-one-end pattern combined with one-end-two-end pattern, B = -37.75 + 1.020A; when the crown belt is wound in two-end-two-end pattern with one layer or the tire product has no crown belt layer, B = -12.59 + 1.024A; when the crown belt is wound in two layers in one-end-one-end pattern or combined with one-end-two-end pattern, B = -34.51 + 1.013A. For semi-steel radial tires, when the crown belt is wrapped in a combination of one-end-one-end and two-end-two-end wrapping, B = -16.66 + 1.012A. For radial passenger car tires, when the crown strip is wrapped in a two-end, two-end pattern or the tire product has no crown strip layer, B = -12.59 + 1.024A.

5. A method for predicting the circumference of an embryo according to any one of claims 1-4, characterized in that, Compare the theoretical predicted value of the outer circumference of the tire blank with the difference between the inner circumference of the flexible mold. If the difference is between 10-20mm, it means that it meets the design requirements of the product. Otherwise, adjust the expansion rate of the belt layer bonding drum and redetermine the circumference of the belt layer bonding drum until the difference is between 10-20mm.

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