A method for testing the conformity of rubber pad design

Abstract

The present invention belongs to the field of tire design testing, and particularly relates to a method for testing the conformity of cushion rubber design. This method requires materials and equipment for testing; the materials include an inner liner, a ladle, a carcass, and a cushion rubber; the equipment used includes a carcass transfer ring, a carcass laminating drum, a building drum, and a contour scanning device, wherein the building drum includes a support block. The carcass drum is formed by combining the inner liner, ladle, carcass, and cushion rubber, and then scanned to obtain the area S and the deepest height h of the inner slope of the cushion rubber. By comparing S and h with design reference values, the rationality of the cushion rubber design, especially the inner slope and positioning, is evaluated.

Description

Technical Field

[0001] The invention belongs to the field of tire design detection, and in particular relates to a method for inspecting the conformity of cushion rubber design. Background Art

[0002] The size, design, and positioning of the cushion rubber during the all-steel radial tire building process are crucial. Air pockets between the cushion rubber and the belt will directly impact the quality of the finished tire, leading to reduced tire durability. Currently, tire cross-section measurements are typically used to initially assess the rationality of cushion rubber design. However, long-term evaluation requires the quality of large-scale tire production. This makes it difficult to promptly adjust and pre-inspect air pockets caused by design issues like cushion rubber size and positioning, leading to batch defects. Summary of the Invention

[0003] In order to solve the above technical problems, the purpose of the present invention is to provide a method for inspecting the conformity of the cushion rubber design. The method requires scanning the inner slope air pocket area S and the deepest height h of the cushion rubber on the carcass tube, and by comparing S and h with the design reference values, the rationality of the cushion rubber design, especially the inner slope and positioning, is evaluated.

[0004] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions:

[0005] A method for inspecting the design conformity of a cushion rubber, the method requiring materials and equipment for inspection; the materials comprising an inner liner, a ladle, a carcass, a cushion rubber, and a tire bead; the equipment comprising a carcass transfer ring, a carcass laminating drum, a building drum, and a contour scanning device, wherein the building drum comprises a support block; the method comprising the following steps:

[0006] S1. Take out the rubber pad and perform offline scanning to confirm whether the size of the rubber pad meets the design requirements;

[0007] S2, ladle, carcass, cushion rubber and tire bead are sequentially attached to the carcass laminating drum to form a carcass drum;

[0008] S3, using the carcass transfer ring to remove the carcass tube from the carcass laminating drum, and send the carcass tube to the building drum;

[0009] S4. Use the building drum support block to prop up the carcass tube, so that the drum shoulder of the building drum shrinks from the flat width position to the fixed position, and ensure that the air pressure in the carcass tube is maintained at 0.1 MPa during the shrinkage;

[0010] S5. Scanning the outer surface of the carcass tube using a profile scanning device and measuring cross-sectional profile data of the carcass tube;

[0011] S6. Calculate the area S and the deepest height h of the air pocket on the inner side of the rubber pad based on the measured cross-sectional profile data;

[0012] S7. Compare the calculated S and h with the design reference values ​​to evaluate the rationality of the rubber pad design, especially the inner slope and positioning.

[0013] Preferably, two groups of cushion rubber are provided in step S2, and are respectively attached to the left and right ends of the carcass.

[0014] Preferably, an inner positioning distance is provided between the two groups of rubber pads.

[0015] Preferably, the cross-sectional profile data in step S5 includes pad rubber profile surface data and inner positioning spacing values.

[0016] Preferably, in step S7, the reference value of S is less than 10 mm², and the reference value of h is less than 0.5 mm.

[0017] Preferably, the method further comprises:

[0018] S8. When S and h are greater than or equal to the design reference value, the padding needs to be adjusted. The adjustment includes repairing the area S and height h of the padding and adjusting the inner positioning distance set between the two sets of padding.

[0019] Preferably, in order to modify the values ​​of S and h in step S8, the cushion rubber needs to be removed from the carcass tube and the steps S1 to S7 need to be repeated so that S and h are ultimately smaller than the design reference values.

[0020] Preferably, the adjustment of the inner positioning distance in step S8 is to enlarge or reduce the inner positioning distance so that S and h are ultimately smaller than the design reference values.

[0021] In summary, the advantages of the present invention are as follows:

[0022] During tire molding, the carcass tube is shaped and inflated, and a profile scanning device is used to measure the cross-sectional profile data of the carcass tube. Based on this data, the area S of the air pocket on the inner slope of the cushion rubber and the deepest height h are calculated. S and h are compared with the design reference values. When S and h meet the requirements, the air pocket rate of the tire can be effectively reduced. By comparing S and h with the design reference values, the rationality of the cushion rubber design, especially the inner slope and positioning, can be evaluated. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 Schematic diagram of the tire structure;

[0024] Figure 2 Scanning images of the rubber pad products for the normal scheme and test scheme 1;

[0025] Figure 3 Finalize the outline for the normal plan;

[0026] Figure 4To define the outline of the experimental plan;

[0027] Figure 5 This is a scan of the rubber pad product for test plan 2;

[0028] Figure 6 Finalize the outline diagram for experimental scheme 2;

[0029] Figure 7 It is a schematic diagram of the structure of the scanning carcass barrel;

[0030] Figure 8 Schematic diagram of the cross section of the tire cavity;

[0031] Reference numerals: 1, carcass; 2, cushion rubber; 3, inner positioning distance. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0033] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0034] It should also be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0035] The following is a detailed description of the specific embodiments of the present invention with reference to the accompanying drawings.

[0036] Example 1:

[0037] like Figures 1 to 8 The figure shows a method for inspecting the design conformity of a cushion rubber. This method requires materials and equipment. The required materials include an inner liner, a ladle, a carcass 1, a cushion rubber 2, and a tire bead. The equipment used includes a carcass transfer ring, a carcass laminating drum, a building drum, and a profile scanning device. The building drum is equipped with a support block.

[0038] In order to ensure the quality of the finished tire, it is necessary to improve the trapping phenomenon between the cushion rubber 2 and the belt, which will lead to a decrease in tire durability. The trapping phenomenon usually occurs after the tire is formed, which will cause a large number of defects in the tire.

[0039] To improve tire flattening, the first thing to consider is the size of the rubber cushion 2. Since there are many different tire models, the size of the rubber cushion 2 needs to be determined according to the model. For example, if the tire model is 12R22.5, the rubber cushion 2 should be 80mm-120mm wide and 8mm-12mm thick, ensuring that the size of the rubber cushion 2 is within this range.

[0040] After determining the size of the cushion rubber 2, the inner liner, ladle, carcass 1 and cushion rubber 2 need to be laminated on the carcass laminating drum in sequence according to the preparation steps. The laminated whole is called a carcass drum.

[0041] Among them, such as Figure 1 As shown, two groups of cushion rubber 2 are provided, and are respectively attached to the left and right ends of the tire body 1, and two inner positioning distances 3 are provided between the two groups of cushion rubber 2. The inner positioning distance 3 is the distance between the inner end point of the cushion rubber 2 and the middle of the tire body 1.

[0042] Since the air pocket is generated between the cushion rubber 2 and the belt, and this method is to improve the tire when the tread is not yet installed, after the carcass tube is assembled, the carcass tube is removed from the carcass laminating drum using a carcass transfer ring and the carcass tube is sent to the building drum.

[0043] Then, the forming drum support block is used to prop up the carcass tube, so that the drum shoulder of the forming drum shrinks from the flat width position to the fixed position, and the carcass tube is continuously inflated during the shrinkage to keep the air pressure in the carcass tube at 0.1 MPa. At this time, the overall shape of the carcass tube will also change accordingly.

[0044] Then, a contour scanning device is used to scan the outer surface of the carcass tube to detect detailed data of the carcass tube surface, including but not limited to the cross-sectional contour data of the carcass tube, and the cross-sectional contour data includes the contour surface data of the cushion rubber 2 and the value of the inner positioning spacing 3.

[0045] After measuring the detailed data, it is transmitted to a computer terminal, and computer software is used to calculate the area S and the deepest height h of the air pocket on the inner slope of the rubber pad 2. The values ​​of S and h are directly related to the air pocket phenomenon.

[0046] The S and h calculated from the measurement are compared with the design reference values, and the rationality of the design of the rubber pad 2 is evaluated by comparing the data. Among them, the rationality of the inner slope and positioning of the rubber pad 2 is particularly critical.

[0047] The above-mentioned design reference values ​​include: the reference value of S is less than 10mm², and the reference value of h is less than 0.5mm.

[0048] like Figures 1 to 8 The figure shows an application case of this method, focusing on products with a high incidence of inner tire delamination defects. The primary defect was air pockets on the inner side of the rubber cushion 2. A total of 6,383 items were tested, with a defect rate of 0.63%. Comparative tests were conducted by adjusting the positioning of the rubber cushion 2 and the design of the inner slope of the rubber cushion 2. This test required measuring the inflation profile of the rubber cushion 2 and conducting comparative trials.

[0049] like Figure 2 and Figure 3 As shown in the figure above, the normal solution has the following data: pad glue 2, inner positioning spacing 3, S and h: pad glue 2 thickness 9mm*width 90mm, inner positioning spacing 3 is 50mm, S=14.92mm² and h=0.85mm.

[0050] like Figure 3 and Figure 4 As shown in the figure above, the test scheme 1, the data of the pad glue 2, internal positioning spacing 3, S and h are: pad glue 2 with thickness of 9mm*width of 90mm, internal positioning spacing 3 of 45mm, S=13.03mm² and h=0.75mm.

[0051] like Figure 5 and Figure 6 As shown in the figure above, the data of test scheme 2, the pad glue 2, the inner positioning spacing 3, S and h are: pad glue 2 with thickness of 9mm*width of 90mm, the inner positioning spacing 3 is 45mm, S=8.27mm² and h=0.47mm.

[0052] Among the three solutions mentioned above, the height of the inflection point of the rubber pad 2 in the normal solution and the first test solution is 3.5 mm, while the height of the inflection point of the rubber pad 2 in the second test solution is 3.8 mm.

[0053] A total of 6,383 pieces were tested in the normal scheme, of which 40 were found to have inner delamination defects, with an incidence rate of 0.63%; a total of 12,519 pieces were tested in the experimental scheme one, of which 67 were found to have inner delamination defects, with an incidence rate of 0.54%; and a total of 5,759 pieces were tested in the experimental scheme two, of which 18 were found to have inner delamination defects, with an incidence rate of 0.31%.

[0054] It can be concluded that by adjusting the inner slope of the rubber pad 2 and changing the inner positioning spacing 3, the incidence of defects can be effectively reduced. After controlling the air pocket area S on the inner side of the rubber pad 2 to below 10 mm² and h to below 0.5 mm, the incidence of defects is reduced by about 50%.

[0055] However, when the calculated S and h are greater than or equal to the design reference values, the rubber pad 2 needs to be readjusted, which includes repairing the area S and height h of the rubber pad 2 and adjusting the inner positioning distance 3 set between the two groups of rubber pads 2.

[0056] To modify the values ​​of S and h, remove the cushion rubber 2 from the carcass and repeat the above steps to reduce S and h to less than the design reference values, thereby reducing the overall defect rate of the finished tire. Redesigning the cushion rubber 2 includes but is not limited to filling the cushion rubber 2 with material to the inner slope of the cushion rubber 2.

[0057] Adjusting the inner positioning spacing 3 is to enlarge or reduce the inner positioning spacing 3 so that S and h are ultimately smaller than the design reference values, wherein the adjustment range is controlled within ±5 mm.

[0058] The inspection method is as follows:

[0059] S1, take out the rubber pad 2 and perform offline scanning to confirm whether the size of the rubber pad 2 meets the design requirements;

[0060] S2. Laminating the inner liner, the ladle, the carcass 1, the cushion rubber 2, and the tire bead in sequence on the carcass laminating drum to form a carcass drum; wherein, there are two groups of cushion rubber 2, which are respectively laminated to the left and right ends of the carcass 1, and an inner positioning distance 3 is provided between the two groups of cushion rubber 2;

[0061] S3, using the carcass transfer ring to remove the carcass tube from the carcass laminating drum, and send the carcass tube to the building drum;

[0062] S4. Use the building drum support block to prop up the carcass tube, so that the drum shoulder of the building drum shrinks from the flat width position to the fixed position, and ensure that the air pressure in the carcass tube is maintained at 0.1 MPa during the shrinkage;

[0063] S5. Scanning the outer surface of the carcass tube using a profile scanning device and measuring cross-sectional profile data of the carcass tube, wherein the cross-sectional profile data includes the profile surface data of the cushion rubber 2 and the value of the inner positioning spacing 3;

[0064] S6. Calculate the area S and the deepest height h of the air pocket on the inner side of the rubber pad 2 based on the measured cross-sectional profile data;

[0065] S7. Compare the calculated S and h with the design reference values ​​to evaluate the rationality of the design of the rubber pad 2, especially the inner slope and positioning; among them, the reference value of S is less than 10mm², and the reference value of h is less than 0.5mm.

[0066] S8. When S and h are greater than or equal to the design reference values, the cushion rubber 2 needs to be adjusted, and the adjustment includes repairing the area S and height h of the cushion rubber 2 and adjusting the inner positioning spacing 3 set between the two groups of cushion rubbers 2; wherein, to modify the values ​​of S and h, it is necessary to remove the cushion rubber 2 from the carcass tube and re-operate according to S1 to S7, so that S and h are ultimately less than the design reference values; and adjusting the inner positioning spacing 3 is to expand or reduce the inner positioning spacing 3, so that S and h are ultimately less than the design reference values.

[0067] The above is a description of the embodiments of the present invention. The above description of the disclosed embodiments will enable professionals in the field to implement or use the present invention. Various modifications to these embodiments will be apparent to professionals 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 the embodiments shown herein, but should conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for testing the conformity of a rubber pad design, characterized in that: The method requires materials and equipment for inspection; the materials include an inner liner, a ladle, a carcass (1), a cushion rubber (2) and a tire bead; the equipment used includes a carcass transfer ring, a carcass laminating drum, a forming drum and a profile scanning device, wherein the forming drum includes a support block; the method comprises the following steps: S1, taking out the rubber pad (2) and performing an offline scan to confirm whether the size of the rubber pad (2) meets the design requirements; S2, ladle, carcass (1), rubber cushion (2) and tire bead are sequentially attached to the carcass laminating drum to form a carcass drum; two groups of rubber cushion (2) are provided, and are attached to the left and right ends of the carcass (1) respectively, and an inner positioning distance (3) is provided between the two groups of rubber cushion (2); S3, using the carcass transfer ring to remove the carcass tube from the carcass laminating drum, and send the carcass tube to the building drum; S4. Use the building drum support block to prop up the carcass tube, so that the drum shoulder of the building drum shrinks from the flat width position to the fixed position, and ensure that the air pressure in the carcass tube is maintained at 0.1 MPa during the shrinkage; S5. Scanning the outer surface of the carcass tube using a profile scanning device and measuring cross-sectional profile data of the carcass tube, the cross-sectional profile data including cushion rubber profile surface data and inner positioning spacing value; S6. Calculate the area S and the deepest height h of the air pocket on the inner side of the rubber pad (2) based on the measured cross-sectional profile data; S7. Compare the calculated S and h with the design reference values ​​to evaluate the rationality of the inner slope and positioning of the rubber pad (2) design.

2. A method for inspecting the conformity of a rubber pad design according to claim 1, characterized in that: In step S7, the reference value of S is less than 10 mm², and the reference value of h is less than 0.5 mm.

3. A method for inspecting the conformity of a rubber pad design according to claim 1 or 2, characterized in that: The method further comprises: S8. When S and h are greater than or equal to the design reference value, the rubber pad (2) needs to be adjusted, and the adjustment includes modifying the area S and height h of the rubber pad (2) and adjusting the inner positioning distance (3) set between the two groups of rubber pads (2).

4. A method for inspecting the conformity of a rubber pad design according to claim 3, characterized in that: To modify the values ​​of S and h in step S8, it is necessary to remove the cushion rubber (2) from the carcass tube and repeat the operations according to S1 to S7 so that S and h are finally smaller than the design reference values.

5. A method for inspecting the conformity of a rubber pad design according to claim 3, characterized in that: The adjustment of the inner positioning spacing (3) in step S8 is to enlarge or reduce the inner positioning spacing (3) so that S and h are eventually smaller than the design reference values.

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