Study On Radial Tire Building Process Simulation And Technological Parameters Improvement Method

The tire manufacturing process consists of rubber mixing, component extrusion, calendaring and cutting, tire building and shaping of green tire; tire building process is the most important step among tire processes, and the technological parameters of which have great influence on the quality of finished tire. In addition, a series of proper process parameters is determined by several times of trial production in traditional methods, the “trial and error” method is quite aimless to improve the defects in tire production. Therefore, the numerical simulation of tire building process using the finite element method is beneficial and significant to optimize the process parameters.A reasonable constitutive modeling of tire uncured rubber is the foundation of tire building process simulation. Firstly, the corresponding relaxation test and tensile test are conducted on uncured rubber, and the viscosity and elasticity of which are described with the generalized Maxwell model and Marlow hyperelastic model respectively. Then, the tire building process of 295/80R22.5 radial tire is modeled as the axisymmetric model using ABAQUS/Standard solver, and the shaping of a green tire process is modeled as three-dimensional model using ABAQUS/Explicit solver. The result shows that material distribution of the simulated structure has good consistence with real tire structure, which proves that the tire building process simulation method is reliable. Furthermore, in order to improve the accuracy of tire construction design and based on the tire building simulation, a reverse simulation method is proposed to accurately design the semi-product components such as apex, tread, shoulder pad, etc. The reverse simulation method of semi-product components is effectively validated by the tire building simulation methodIn this paper, the mechanism of the wide-base tire carcass cord bending problem caused by the improper process parameters is analyzed using tire building process simulation method. Through the analysis of the effect of plat width and auxiliary drum circumference of carcass cord bending, the solution of carcass bending problem is proposed, and a corresponding experiment is performed to validate the simulation results. To solve the problem of inner unevenness in wide-base tire using 0° winding technology, the reason of which is explored, the surface auxiliary drum building method is developed to solve this problem, and the results of trial production show that the surface drum building method is useful in solving tire inner unevenness problem. The 12.00R22.5 radial tire second-stage building process simulation from tire building to curing is developed, and the cord force and angle change distribution of belts are studied. Improvement construction design is proposed to make that the green tire shape is closer to the finished tire, the cord force and angle change in tire building would decrease to meet the requirements of product consistency.