Production processes and testing methods to improve tire tread durability

Abstract

This invention relates to a production process and inspection method for improving the durability of tire treads, belonging to the field of tire production and testing. The process includes the following steps: First, an online measurement device for the thickness of the rubber strip before winding is added to the tire winding equipment during the tire blank production process. Winding can only begin after the rubber strip thickness meets the set requirements. After tire blank winding, multi-point symmetrical thickness calculation and judgment are performed. Second, a second circumference measurement is performed at corresponding points after tread winding. Then, for tire blanks with tread winding thickness meeting the requirements, sidewall rubber sheets are applied, pressed, punctured, and the tire is removed. Finally, the tire is transported to the vulcanization process for subsequent vulcanization operations. After vulcanization, the finished tire is removed from the vulcanizing machine and laid flat for at least one vulcanization cycle. After the flat laying time, a molding tool is used to sequentially mold the inner curvature at four measured positions. After molding, measurements and judgments are performed according to tire section technical standards.

Description

Technical Field

[0001] This invention relates to the field of tire production and testing, and more specifically to a production process and testing method for improving the durability of tire treads. Background Technology

[0002] As is well known, the tread winding thickness fluctuates during the current production process of engineering radial tires, and the current product inspection capabilities are insufficient. Products with tire crown thickness deviations cannot be identified in a timely and effective manner, leading to quality problems such as early delamination and abnormal wear in the crown and shoulder areas during tire use, which affects the overall service life of the tire. Summary of the Invention

[0003] To overcome the shortcomings of existing technologies, this invention provides a production process and inspection method to improve the durability of tire crowns. This method can improve the overall dimensional conformity of tire crowns and enhance product inspection capabilities. It can effectively identify and control abnormalities in the thickness of the crown and shoulder areas and the crown curve of the inner lining, thereby reducing quality problems such as crown delamination and abnormal tread wear.

[0004] The technical solution adopted by this invention to solve its technical problem is: a production process and inspection method for improving the durability of tire tread, characterized by including the following steps.

[0005] a. Add an online measuring device for the thickness of the rubber strip before winding to the tire blank winding equipment during the tire blank production process. Winding can only be started after the rubber strip thickness meets the set requirements.

[0006] b. Multi-point symmetrical thickness calculation and judgment after the tire carcass is wound refers to the second measurement and calculation of the corresponding circumference after the tire tread is wound, and the conformity and symmetry of the actual thickness of the tire tread winding are judged according to the standard. Then, the tire carcass with the tire tread winding thickness that meets the requirements is subjected to tire sidewall rubber bonding, pressing, tying and tire removal operations, and finally transported to the vulcanization process for subsequent vulcanization operations.

[0007] c. After vulcanization, remove the finished tire from the vulcanizing machine and lay the tire flat for ≥1 vulcanization cycle. After the flat period, measure the thickness of the upper and lower mold shoulders of the tire in sequence, mark the points corresponding to the thickness of the tire inner shoulder, and then use a molding tool to take the inner curvature of the four measured positions in sequence.

[0008] d. After taking the shape, place the molder on the 1:1 outline drawing of the product being measured, with the center of the molder corresponding to the center of the outline drawing. Then, draw the actual tire inner curve on the drawing according to the shape of the molder. Finally, measure and judge the shape taking results according to the tire section technical standards.

[0009] This invention can also be achieved through the following measures:

[0010] The requirement that the rubber strip thickness meets the set requirements means that after the tire blank is shaped and before winding, its circumference is measured at multiple points according to technical standards. After measurement, the tire blank is transferred to the winding station, the cold feed is turned on, and the extruded rubber strip is guided through the cooling drum and conveyor belt to the tire blank winding equipment and its guide rollers. When the extruded rubber strip passes through the rubber strip thickness online measuring device, it automatically measures the rubber strip thickness. Only when the rubber strip thickness meets the set standard range can the winding machine start winding.

[0011] When taking the shape, the center of the take-up mold should correspond to the center of the tire, the width of both sides of the take-up mold should be greater than the point marked on the shoulder thickness, and the position of the take-up mold corresponding to the shoulder point should be marked on the take-up mold.

[0012] The beneficial effects of this invention are that it can improve the overall dimensional conformity of the tire tread area and enhance inspection capabilities through this inspection method. It can effectively identify and control abnormalities in the thickness of the tire crown and shoulder area and the crown curve of the tire lining, thereby reducing the failure rate caused by crown detachment and tread abnormalities. Attached Figure Description

[0013] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0014] Figure 1 This is a schematic diagram of the structure of the online measurement device for the thickness of the rubber strip before winding on the tire carcass winding equipment of the present invention.

[0015] Figure 2 This is a schematic diagram of the thickness measurement before tread winding according to the present invention.

[0016] Figure 3 This is a schematic diagram of the thickness measurement after the tread is wound according to the present invention.

[0017] Figure 4 This is a diagram showing the location of the shoulder section of the finished tire.

[0018] Figure 5 It is a diagram of the shoulder thickness on the corresponding drawing after measurement.

[0019] In the figure: 1. Tire blank winding equipment; 2. Online rubber strip thickness measuring device. Detailed Implementation

[0020] like Figure 1As shown, an LTG-680 type online rubber strip thickness measuring device 2 is added to the tire carcass winding equipment 1 during the tire carcass production process. This device is mainly used to measure the thickness of the rubber strip before winding. If the rubber strip thickness exceeds the standard when the tire carcass starts winding, the tire carcass winding equipment 1 will not be able to start. Only after the thickness meets the set requirements can the tire tread winding start and normal production be carried out.

[0021] like Figure 2 As shown, the measurement of the symmetrical circumference of the preform before winding refers to the measurement of the circumference of the preform at multiple points according to the technical standards after it has been shaped and before winding. The measurements are recorded according to the principle of points a, b, ... n (Note: points a, b, etc. are based on the parameters of the standard positions issued by the technical department, and then positioning lights are used to determine each measurement position).

[0022] (Note: The number of points n here refers to the fact that the number of points may vary depending on the specifications. Therefore, n points are not limited to points a, b, and c. At most, it could be up to point h, or it could be up to point p.)

[0023] After measurement, the tire blank is transferred to the winding station. Cold feeding is then initiated, and the extruded rubber strip is guided through a cooling drum and conveyor belt to the winding machine and its guide rollers. As the extruded rubber strip passes the online thickness measurement device, the thickness is automatically measured. The winding machine can only begin winding if the rubber strip thickness meets the set standard range. Note: If the rubber strip thickness does not meet the standard, the machine will fail to start due to error prevention features and will be abandoned.

[0024] like Figure 3 As shown, after the tire carcass is wound, a second measurement of the circumference at the corresponding point is performed, and the measurements are recorded according to the principle of points A, B...N (Note: the positioning method of points A and B is the same as that of points a and b). Then, the actual winding thickness is calculated (Note: the formula for calculating the thickness at point A is: A = (circumference of point A / π - circumference of point a / π) / 2, and the calculation method for the thickness at other points is the same). The standard compliance and symmetry are then judged according to the standard.

[0025] Then, the tire blanks with the required tread winding thickness are subjected to operations such as sidewall rubber bonding, pressing, tying, and tire removal, and finally transported to the vulcanization process for subsequent vulcanization production operations.

[0026] like Figure 4As shown, after vulcanization, the finished tire is removed from the vulcanizing machine and laid flat on a flatbed truck for at least one vulcanization cycle. After the flattening time, the thickness of the upper and lower shoulder sections of the tire is measured sequentially using calipers (Note: measurement is performed at 90° / point), and the points corresponding to the thickness of the tire inner shoulder are marked as follows: Upper 1, Lower 1, Upper 2, Lower 2, Upper 3, Lower 3, Upper 4, Lower 4; and the measured data is recorded. Then, a molding tool is used to take molds of the tire inner curvature at the four measured positions sequentially. During molding, the center of the molding tool should correspond to the center of the tire, and the width of both sides of the molding tool should be greater than the marked points of the shoulder thickness. The positions of the molding tool corresponding to the shoulder points are marked on the molding tool.

[0027] like Figure 5 As shown, after taking the shape, place the molder on the 1:1 outline drawing of the product being measured, with the center of the molder corresponding to the center of the outline drawing. Then, based on the thickness data of the shoulder (upper 1, lower 1), draw the corresponding points I and II on the drawing. Align the points marked on the molder (upper 1, lower 1) with the newly drawn points I and II on the drawing, so that I, II and the center of the drawing match the center of the molder (upper 1, lower 1) and the center of the molder, respectively. Then, draw the actual tire inner curve on the drawing according to the shape of the molder. Repeat this process to take and draw the actual tire inner curves at positions (upper 2, lower 2, upper 3, lower 3, upper 4, lower 4). Finally, measure and judge according to the tire section technical standards.

Claims

1. A manufacturing process and testing method for improving the durability of tire tread, characterized in that, Includes the following steps, a. Add an online measuring device for the thickness of the rubber strip before winding to the tire blank winding equipment during the tire blank production process. Winding can only be started after the rubber strip thickness meets the set requirements. b. Multi-point symmetrical thickness calculation and judgment after the tire carcass is wound refers to the second measurement and calculation of the corresponding circumference after the tire tread is wound, and the conformity and symmetry of the actual thickness of the tire tread winding are judged according to the standard. Then, the tire carcass with the tire tread winding thickness that meets the requirements is subjected to tire sidewall rubber bonding, pressing, tying and tire removal operations, and finally transported to the vulcanization process for subsequent vulcanization operations. c. After vulcanization, remove the finished tire from the vulcanizing machine and lay the tire flat for ≥1 vulcanization cycle. After the flat period, measure the thickness of the upper and lower mold shoulders of the tire in sequence, mark the points corresponding to the thickness of the tire inner shoulder, and then use a molding tool to take the inner curvature of the four measured positions in sequence. d. After taking the shape, place the molder on the 1:1 outline drawing of the product being measured, with the center of the molder corresponding to the center of the outline drawing. Then, draw the actual tire inner curve on the drawing according to the shape of the molder. Finally, measure and judge the shape taking results according to the tire section technical standards.

2. The production process and testing method for improving tire tread durability according to claim 1, characterized in that... The requirement that the rubber strip thickness meets the set requirements means that after the tire blank is shaped and before winding, its circumference is measured at multiple points according to technical standards. After measurement, the tire blank is transferred to the winding station, and then the cold feed extruder is turned on. The extruded rubber strip is guided through the cooling drum and conveyor belt to the tire blank winding equipment and its guide rollers. When the extruded rubber strip passes through the rubber strip thickness online measuring device, it automatically measures the rubber strip thickness. Only when the rubber strip thickness meets the set standard range can the winding machine start winding.

3. The production process and testing method for improving tire crown durability according to claim 1, characterized in that... When taking the shape, the center of the take-up mold should correspond to the center of the tire, the width of both sides of the take-up mold should be greater than the point marked on the shoulder thickness, and the position of the take-up mold corresponding to the shoulder point should be marked on the take-up mold.

Images