CN-121989486-A - Method and system for improving tire sidewall recession by superposing sidewall joint and curtain joint and tire

CN121989486ACN 121989486 ACN121989486 ACN 121989486ACN-121989486-A

Abstract

The invention relates to the technical field of tire production, in particular to a method and a system for improving tire sidewall recession by superposing a sidewall joint and a curtain joint and a tire. In the tire forming process, accurate process control is adopted, so that the sidewall joint and the curtain joint are overlapped in the circumferential direction, and a unified overlapped reinforcing area is formed. The concave depth of the side wall can be effectively reduced and the appearance quality can be improved by controlling the circumferential superposition error and ensuring the radial projection superposition of the joint area. The method does not need to change the rubber formula or increase the thickness of the sidewall rubber, and the appearance of the tire is obviously improved and the qualification rate is improved only by optimizing the joint position and angle. The examples show that sidewall dishing was reduced from conventional 0.7mm to 0.45mm and the yield increased to 87.62%. The invention provides a simple, convenient, efficient and suitable for mass production tire manufacturing process, and has a strong industrial application prospect.

Inventors

FANG DI
HONG LIN
CHEN GANGPING
JIANG HAOJUN
FENG YIJIA
MU QINGSONG
KANG HAIJUN
ZHANG BO
ZHANG LIQIANG

Assignees

中策橡胶集团股份有限公司
杭州海潮橡胶有限公司

Dates

Publication Date: 20260508
Application Date: 20260313

Claims (10)

1. A method of superposing a sidewall joint and a ply joint to improve sidewall dishing of a tire, comprising the steps of: S1, establishing circumferential angle coordinates on a tire building drum And set the target joint angle ; S2, at the circumferential angle coordinate Winding the carcass ply to form a carcass sleeve, and jointing the circumferential ends of the carcass ply to form a ply-yarn joint, wherein the corresponding angle position of the central line of the ply-yarn joint is And control the alignment error of the cord fabric joint Is not greater than the alignment threshold value of the curtain cloth ; Is the angle position of the central line of the curtain cloth joint, , S3, attaching the side rubber to the outer side of the tire body cord sleeve and jointing the circumferential end parts of the side rubber to form a side joint, wherein the corresponding angle position of the center line of the side joint is , S4, acquiring real-time angle of the forming drum based on the angle acquisition unit And based on the joint recognition unit And (3) with Calculating, by the controller, a circumferential overlay error And controlling the actuating mechanism to compensate the rotation angle of the forming drum and the initial angle of the sidewall rubber fitting, so that Not greater than the maximum overlay error Simultaneously, the projection overlapping proportion of the overlap width of the side joint and the overlap width of the cord fabric joint on the radial section of the tire Not less than the overlap threshold Forming a superposed reinforcing zone on the carcass of the tire; s5, vulcanizing the green tire forming the superposition reinforcement zone, and measuring the sidewall dent value according to specified inflation and standing conditions after vulcanization When (when) Exceeding the sag control threshold Based on And For the next tyre And/or the initial angle of the sidewall rubber fitting is corrected and updated.
2. The method according to claim 1, characterized in that: And is also provided with ; And/or the number of the groups of groups, Wherein, the method comprises the steps of, Determined as follows: ; And meet the following requirements Wherein, the method comprises the steps of, For the projected width of the sidewall joint overlap width on the radial cross section, The projection width of the overlap band width of the cord fabric joint on the radial section, The overlap width is projected for both.
3. The method of claim 1, wherein the correction update of step S5 comprises updating the sidewall rubber fitting start angle of the next tire according to the following compensation formula : ; Wherein, the And (3) with Respectively the first Strip and the first The sidewall rubber of the strip tire is attached to the initial angle, And (3) with Respectively the first The central angle of the side joint of the strip tire and the central angle of the cord fabric joint, To compensate for the coefficient and satisfy ; And/or, the prescribed aeration and standing conditions in step S5 include aeration to a rated air pressure And stand still Wherein For the rated air pressure to be the rated air pressure, Is a standing time, and Hours.
4. The method according to claim 1, wherein the joint identification unit comprises visual identification means and/or laser profile means for identifying joint boundaries and determining And (3) with 。
5. The method of claim 1, wherein the tire liner joint center angle is The central angle of the relevant joint of the tread or the belt is And satisfies: ; Wherein, the For the joint avoidance angle threshold value, 60-180 Degrees.
6. The method of claim 1, wherein the ply joint is a lap joint and the lap length is The sidewall joint is a chamfer lap joint and the chamfer angle is The lap joint length is Wherein, the method comprises the steps of, Is 5mm to 25mm in length, Is 10-45 degrees, Is 5mm to 30mm.
7. A tire prepared by the method of any one of claims 1 to 6, and having a sidewall cavity average value Not more than 0.5 mm, wherein, Measuring the dent value of the tires of the same batch at the corresponding circumferential positions of the superposition reinforcement zone Is satisfied by the arithmetic mean of: ; Wherein, the In order to obtain a sample size of the sample, Is the first The sag value of the strip tire, Is a positive integer.
8. A tire building positioning system for implementing the method of any one of claims 1-6, comprising a tire building drum, an angle acquisition unit, a joint identification unit, an actuator and a controller, wherein, The angle acquisition unit is used for acquiring real-time angles of the forming drum ; The joint identification unit is used for obtaining And (3) with ; The controller is used for calculating And outputting a control instruction; the actuating mechanism is used for compensating the rotation angle of the forming drum and/or the initial angle of the sidewall rubber fitting, so that And is also provided with Wherein, the method comprises the steps of, As an upper limit of the maximum coincidence error, Is the minimum overlap threshold.
9. A computer readable storage medium having stored thereon a computer program or instructions, which when executed by a processor, realizes the steps of the method of any of claims 1-6.
10. A computer program product comprising a computer program or instructions which, when executed by a processor, carries out the steps of the method of any one of claims 1 to 6.

Description

Method and system for improving tire sidewall recession by superposing sidewall joint and curtain joint and tire Technical Field The invention relates to the technical field of tire production, in particular to a method and a system for improving tire sidewall recession by superposing a sidewall joint and a curtain joint and a tire. Background The sidewall of the radial tire not only bears certain bearing and protecting functions, but also is one of the most visual appearance evaluation areas of the end customer. With the continuous increase in the demands of the whole vehicle market for consistency, refinement and brand recognition of the tire, defects in the appearance of the sidewall (such as local pits, undulations, waves, etc.) have become one of the important indicators for the process quality control of tire enterprises. In practice, sidewall dimples are often not caused by a single material defect, but rather are more related to the "joint/splice" of the multi-layer components in the tire building process, which is the inevitable formation of cord joints when the carcass ply is cut and wound into a can, and the inevitable formation of sidewall joints when the sidewall rubber is applied and overlapped. There are typically local stiffness differences caused by cord overlap/butt joints, local thickness differences caused by compound overlap, and thermal history differences during cure at the joint locations described above. After vulcanization cooling, the shrinkage, modulus evolution and residual stress distribution of the joint area and the surrounding matrix material are inconsistent, so that macroscopic local pits or unevenness are formed on the surface of the sidewall. Although the defects may be more biased to the appearance quality problem in part of the scenes, the appearance qualification rate of the product is obviously reduced, the repair and scrapping are increased, and the process stability and the cost control of enterprises are adversely affected. In order to reduce or eliminate the recess of the sidewall, a plurality of technical routes are formed in the prior art, and typical thinking comprises firstly structural modification of a curtain cloth joint body, secondly reinforcement or reinforcement of a curtain cloth joint area and thirdly reduction of fluctuation brought by the joint from the angle of uniformity of part manufacturing or forming. However, the above solutions focus on "structural or strength improvement of a single component joint", and the use of the process parameter "relative positional relationship between different component joints" is still relatively insufficient. For example, prior U.S. patent No. 4466473a discloses a splicing structure of carcass ply materials and a method for preparing the same, which has a core focus on the configuration and connection mode of the ply/cord at the splice, and improves the structural continuity and uniformity of the splice region by a specific splicing form (such as optimization of butt joint/lap joint configuration), thereby reducing the problems of local unevenness, abnormal appearance or performance fluctuation caused by the splice region. The technology has the advantages that the local rigidity mutation caused by the curtain cloth joint can be relieved to a certain extent only by improving the geometric form and the connection mode of the curtain cloth joint without changing the whole tire structure. The limitation is also obvious, the acting point is still structural optimization of the curtain cloth joint, and the cooperative relationship of the side rubber joint and the curtain cloth joint in the same circumferential/radial area is not considered from the multi-component coupling point of the tire forming process. That is, even if the ply-yarn junctions are optimized, if the sidewall junctions are still arranged in a circumferentially dispersed manner with the ply-yarn junctions, the shrinkage inconsistency after vulcanization cooling may still form new irregularities or depressions in the sidewalls, making it difficult to stably obtain a significant appearance improvement. Another typical scheme is shown in chinese patent CN101073922a, which discloses a method for jointing carcass ply and cord fabric of radial ply tyre, wherein adhesive-adding sheets are added on the front and back sides of the ply joint part to increase the bonding area and improve the connection strength, and the process implementation modes of pre-sticking the film on a cutting machine or a forming drum, butt-jointing, then sticking the film and the like are provided on the operation flow. The purpose of this kind of scheme is to reduce the delamination risk of curtain cloth joint department and promote joint strength, has positive meaning to tire durability and security. However, from the appearance defect mechanism of sidewall dishing, the adhesion promoter essentially alters the local thickness and local stiffness distribution near the joint, making