Processes that ensure the quality of tire tread components

Abstract

This invention discloses a process for ensuring the quality of tire tread components, belonging to the field of engineering machinery tire manufacturing technology. By adjusting the bonding sequence and tread pressing parameters of the tread components, this invention can improve the stability of tire tread pressing quality and reduce the occurrence of quality problems such as incomplete tread pressing and sparse bonding of the pressed belt layers.

Description

Technical Field

[0001] This invention relates to the field of engineering machinery tire manufacturing technology, and specifically to a process for ensuring the quality of tire tread components. Background Technology

[0002] Currently, in the process of forming the tire blanks of wide-body vehicles used in the market, most of the tread and base rubber are extruded parts. During the pressing process of these parts, quality problems such as incomplete pressing and deformation of the belt layer are prone to occur. In addition to causing defective products in the manufacturing process, these problems are also prone to early shoulder detachment and crown detachment during market use, affecting the overall service mileage of the tire. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a process to ensure the quality of tire tread components, which can improve the stability of tire tread pressing quality and reduce the occurrence of quality problems such as incomplete tread pressing and sparse pressing of belt layers.

[0004] The technical solution of this invention is as follows:

[0005] The process for ensuring the quality of tire tread components includes the following steps:

[0006] (1) Adhesion of tread components

[0007] After the belt layer is bonded to the bonding drum side, it is pressed together, and then the base rubber is bonded and pressed together. After pressing, gasoline is brushed onto the upper surface of the base rubber and roughened, and then gasoline is brushed onto the upper surface of the base rubber again to obtain the belt layer assembly. The tread assembly is transferred to the shaping drum side to complete the tire blank shaping and the pressing of the belt layer assembly. After pressing, air bubbles are removed, and then the tread rubber is bonded and pressed together.

[0008] (2) Setting of tread pressing parameters

[0009] First, perform an axial return operation on the rear pressure roller and move it to the pressing waiting position. Then, manually jog the rear pressure roller to move it radially forward until it reaches the position where it can press against the tire tread when it extends. During pressing, the extension length of the rear pressure roller cylinder should be 1 / 2 to 2 / 3 of the total cylinder length. If the cylinder extension length is too short during pressing, the pressure on the tire tread will be too high, causing damage to the tire tread; if the extension length is too long, the pressure on the tire tread will be too low, resulting in poor pressing effect. The starting position of the rear pressure roller is located at the center line of the tread rubber. The radial starting position is set as A, and the axial starting position as B. The pressing parameters for the endpoints of the horizontal region from the tread center to the center of the tread rubber are: radial parameter C = A + (5~50) mm, axial parameter D = L1, where L1 is the distance between the tread rubber center line and the endpoints of the horizontal region at the center of the tread rubber. The pressing parameters for the inner endpoints of the thickest tread rubber region from the tread rubber center line are: radial parameter E = C + h1, where h1 is the distance between the inner endpoint of the thickest tread rubber region on the lower plane of the tread rubber and the belt layer assembly. The distance between them is defined by the axial parameter F = L2 + D, where L2 is the distance between the endpoint of the horizontal region at the center of the tread rubber and the inner endpoint of the thickest region of the tread rubber, and the rear pressure roller rotation angle J = 3~8°. The pressing parameters from the inner endpoint to the outer endpoint of the thickest region of the tread rubber are set as follows: radial parameter H = E + h2, where h2 is the distance between the lower tread plane corresponding to the outer endpoint of the thickest region of the tread rubber and the belt layer assembly, and axial parameter G = L3 + F, where L3 is the distance between the inner endpoint and the outer endpoint of the thickest region of the tread rubber. The rear pressure roller rotation angle K = 8~26°; the pressing parameters from the outer end of the thickest tread rubber area to the end of the tread rubber are set as follows: radial parameter L = H + h3, where h3 is the distance between the lower tread plane corresponding to the end of the tread rubber and the belt layer assembly; axial parameter M = L4 + G + (20~60) mm, where L4 is the distance between the outer end of the thickest tread rubber area and the end of the tread rubber; and the rear pressure roller rotation angle N = 8~26°.

[0010] It should be noted that there are two rear pressure rollers, which simultaneously press the tire tread rubber towards the left and right ends from the starting position. The radial and axial parameters mentioned above refer to positional parameters. For example, the radial parameter C = A + (5~50) mm means that the rear pressure roller moves (5~50) mm radially from the starting radial position A to the position A + (5~50) mm; while the radial parameter E = C + h1 means that the rear pressure roller continues to advance radially by a distance h1 after moving (5~50) mm in the previous step; the radial parameters H and L are deduced in the same way. Similarly, for axial parameters, such as axial parameter D=L1, it means that the two rear pressure rollers start from the axial starting position B, one moves to the left and the other moves to the right, each moving a distance L1, to reach the two endpoints of the horizontal area at the center of the tread rubber; axial parameter F=L2+D means that after the two rear pressure rollers reach the endpoints of the horizontal area at the center of the tread rubber, they continue to move to the left and right a distance L2, respectively, to reach the inner endpoints of the two thickest areas of the tread rubber; axial parameters G and M are deduced in the same way.

[0011] Preferably, the process also includes an inspection step, which involves performing an X-ray inspection on the formed tire blank and determining whether the obtained X-ray image of the tire blank contains tire shoulder bubbles or whether the steel wires in the tire shoulder belt layer are sparse.

[0012] Compared with the prior art, the present invention has the following advantages:

[0013] 1. The process of the present invention can improve the stability of tire tread pressing quality and reduce the occurrence of quality problems such as incomplete tread pressing and sparse pressing of belt layers.

[0014] 2. This invention can effectively identify and control such defects, such as air bubbles and belt layer separation defects, by performing X-ray inspection on the produced tire blanks in the tire shoulder area, thereby reducing the risk of product failure caused by these defects. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of the present invention.

[0017] Figure 2 yes Figure 1 A magnified view of a portion of the image.

[0018] In the diagram, 1 is the belt layer assembly; 2 is the tread compound. Detailed Implementation

[0019] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this invention.

[0020] Example 1

[0021] In this embodiment, the 16.00R25 tread assembly bonding operation is as follows: First, the #1, #2, and #3 belt layers are bonded at the belt layer bonding station on the bonding drum. After bonding, the belt layers are pressed using a rear pressure roller. After pressing, the base adhesive is bonded, and then the base adhesive is pressed again. Then, gasoline is used to brush the upper surface of the base adhesive, and a wire brush is used to roughen the outer surface of the base adhesive circumferentially, completing the production of belt layer assembly 1. Then, belt layer assembly 1 is transferred to the shaping drum for tire blank shaping and pressing. After pressing, air bubbles are punctured, and then the tread adhesive 2 is bonded. Subsequently, the tread pressing parameters in Table 1 are set and saved, and the automatic pressing program is started to press the tread. After tread pressing, air bubbles are checked and punctured, and then the sidewall wrapping and pressing are performed to complete the tire blank production.

[0022] Comparative Example 1

[0023] The tread assembly bonding process is as follows: After bonding the belt layer to the bonding drum side, directly bond and press the base adhesive. Then, bond and press the tread to the bonding drum side. Next, transfer the bonded tread assembly to the shaping drum side for tire carcass shaping. After tire carcass shaping, use the rear pressure roller to press the tread. During tread pressing, if... Figure 1-2 As shown, set and save the tread pressing parameters according to Table 1, then start the automatic pressing program to press the tread. After the tread pressing is completed, check for air bubbles and perform puncture operations. Then, perform sidewall wrapping and pressing operations to complete the production of the tire embryo.

[0024] The calculation methods for each parameter in Example 1 in Table 1 are as follows: C=A+10mm, D=L1, E=C+h1, F=L2+D, H=E+h2, G=L3+F, L=H+h3, M=L4+G+20mm. Where L1=80mm, L2=60mm, L3=40mm, L4=80mm, h1=10mm, h2=25mm, and h3=50mm.

[0025] Table 1

[0026]

[0027] In Comparative Example 1, after the tread is bonded to the side of the bonding drum, during the pressing process of the tread after the tire blank is shaped, the belt layer, base rubber, and tread rubber 2 are pressed together. During the pressing process, the overall thickness is large, making it difficult for the rear pressure roller to press. In the end, the belt layer is easily crushed, causing the steel wires to become sparse. After vulcanization, the defective products with sparse steel wires are produced, and the scrap rate reaches about 2%.

[0028] In Example 1, after adjusting the bonding sequence of the tread assembly, the belt layer assembly 1 is first pressed on the shaping side. At this time, its thickness is about 50% of the pressing thickness of Example 1. During the pressing process, it is easy to achieve flat pressing of the components. After the pressing is completed, the tread adhesive 2 is then bonded and pressed, thereby effectively avoiding the problem of belt layer disintegration during the pressing process of the tread assembly and solving the problem of belt layer steel wire sparseness defect caused by this.

[0029] Furthermore, the production efficiency and shoulder bubble defects of the tire blanks produced using the processes of Example 1 and Comparative Example 1 are shown in Table 2:

[0030] Table 2

[0031] Design Category Production efficiency Shoulder bubble defect ratio Remark Example 1 1.5 items / hour 0% 50% increase in efficiency Comparative Example 1 1 item / hour around 3%

[0032] In Comparative Example 1, the tread pressing parameters frequently resulted in incomplete pressing of the thickest part of the tread, leading to shoulder air bubble defects. Furthermore, the pressing process required an operator to observe the pressing effect at the rear pressing station, and a combination of semi-automatic and manual pressing methods was needed to complete the pressing of the tread components. The operator standing at the rear pressing station posed a safety hazard, and manual pressing also negatively impacted production efficiency, quality uniformity, and stability.

[0033] In Example 1, by formulating and adjusting the tread pressing parameters, it is not necessary to arrange operators to monitor the tread component pressing process at the rear pressing station. Furthermore, it can automatically complete the compact pressing of the tread component, thereby reducing safety risks, ensuring quality, and improving efficiency.

[0034] Random sampling inspections were conducted on 16.00R25 E4 tire blanks produced in Example 1 and Comparative Example 1, and X-ray inspections were performed on each. It was found that the widest belt layer of the tire blank produced in Comparative Example 1 had a quality problem of sparse steel wires, with a sparse distance of 2 wires. This area was marked. The tire blank was then vulcanized, and X-ray inspection was performed after vulcanization. The same quality problem of sparse steel wires was still found in the widest belt layer, and the marking confirmed that it was located in the same position as the sparse problem on the tire blank. Measurements confirmed that the sparse steel wires reached 2.5, which did not meet the requirements. However, the difference from the X-ray inspection result of the tire blank was 0.5 wires, which is within the acceptable range. Meanwhile, during the X-ray inspection of the tire blank produced in Comparative Example 1, an issue with uneven tread, also known as an air bubble defect, was discovered in the shoulder area of ​​the upper mold. The measured area reached 10 square centimeters, and this location was subsequently marked. The tire blank was then vulcanized, and an X-ray inspection after vulcanization revealed an air bubble problem in the shoulder area. The marking confirmed that this air bubble was located in the same position as the air bubble in the tire blank. Measurements confirmed that the air bubble area reached 8.7 square centimeters, a difference of 1.3 square centimeters from the X-ray inspection result, which is within an acceptable range. Furthermore, a cross-section of the defective area confirmed the presence of an air bubble, proving the effectiveness of the X-ray inspection method of this invention.

[0035] X-ray inspection of the tire blanks produced in Example 1 revealed sparse strands in the belt layer and abnormal lacing quality. The tire blanks were then vulcanized, and subsequent X-ray inspection showed no sparse strands or lacing issues in the finished belt layer, meeting the requirements. Simultaneously, during the X-ray inspection of the tire blanks produced in Example 1, no shoulder air bubbles were found. Further vulcanization and subsequent X-ray inspection revealed no shoulder air bubbles, and even after cross-section cutting, no shoulder air bubbles were found, proving the effectiveness of the X-ray inspection.

[0036] The X-ray inspection results of Example 1 and Comparative Example 1 show that the present invention, by adjusting the bonding sequence of the tread components and setting the tread pressing parameters, can improve the stability of tire tread pressing quality. This process can also reduce quality defects such as steel wire separation defects and tire shoulder air bubbles caused by inadequate tread pressing. Furthermore, the present invention, through X-ray inspection, can effectively identify and control air bubbles and steel wire separation problems in the tire shoulder area, reducing the risk of product failure caused by these issues.

[0037] Although the present invention has been described in detail with reference to the accompanying drawings and preferred embodiments, the invention is not limited thereto. Various equivalent modifications or substitutions can be made to the embodiments of the invention by those skilled in the art without departing from the spirit and essence of the invention, and such modifications or substitutions should all be within the scope of the invention. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the invention should also be covered within the protection scope of the invention. Therefore, the protection scope of the invention should be determined by the scope of the claims.

Claims

1. A process for ensuring the quality of tire tread components, characterized in that, Includes the following steps: Tread component bonding After the belt layer is bonded to the side of the bonding drum, it is pressed, and then the base rubber is bonded and pressed. After pressing, gasoline is brushed on the upper surface of the base rubber and roughened, and then gasoline is brushed on the upper surface of the base rubber to obtain the belt layer assembly (1). The tread assembly is transferred to the shaping drum side to complete the tire blank shaping and the pressing of the belt layer assembly. After pressing, the air bubble is punctured, and then the tread rubber (2) is bonded and pressed. Setting tread pressing parameters If the radial starting position of the rear pressure roller is set to A and the axial starting position to B, then the pressing parameters for the endpoints of the horizontal region from the tread center to the tread rubber center are: radial parameter C = A + (5~50) mm, axial parameter D = L1, where L1 is the distance between the tread rubber centerline and the endpoints of the horizontal region at the tread rubber center; the pressing parameters for the inner endpoints of the thickest tread rubber region from the tread rubber centerline are: radial parameter E = C + h1, where h1 is the distance between the inner endpoint of the thickest tread rubber region corresponding to the lower plane of the tread rubber and the belt layer assembly, axial parameter D = L1. The radial parameter F = L2 + D, where L2 is the distance between the endpoint of the horizontal region at the center of the tread rubber and the inner endpoint of the thickest region of the tread rubber, and the rear pressure roller rotation angle J = 3~8°; the pressing parameters from the inner endpoint to the outer endpoint of the thickest region of the tread rubber are set as follows: radial parameter H = E + h2, where h2 is the distance between the lower tread plane corresponding to the outer endpoint of the thickest region of the tread rubber and the belt layer assembly; axial parameter G = L3 + F, where L3 is the distance between the inner endpoint and the outer endpoint of the thickest region of the tread rubber. The rear pressure roller rotation angle K = 8~26°; the pressing parameters from the outer end of the thickest tread rubber area to the end of the tread rubber are set as follows: radial parameter L = H + h3, where h3 is the distance between the lower tread plane corresponding to the end of the tread rubber and the belt layer assembly; axial parameter M = L4 + G + (20~60) mm, where L4 is the distance between the outer end of the thickest tread rubber area and the end of the tread rubber; and the rear pressure roller rotation angle N = 8~26°.

2. The process for ensuring the quality of the tire tread assembly as described in claim 1, characterized in that, It also includes an inspection step, which involves X-ray inspection of the formed tire blank, and determining whether there are tire shoulder bubbles or sparse steel wires in the tire shoulder belt layer based on the obtained X-ray inspection image of the tire blank.

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