Static And Dynamic Characteristics Analysis And Structural Optimization Design Of Driving Box Of SR-10 Radial Tire Building Machine

The driving box of the radial tire building machine is an important equipment in the flexible production line of semi-steel radial tire.Its main function is to provide power for the building drum,and laminate different tire materials sent from the feeding frame layer by layer to manufacture the tire embryo.Because the driving box of the radial tire building machine works continuously under heavy load for a long time,it will be subjected to all kinds of periodic and non-periodic dynamic loads in the working process.If it does not have good static and dynamic performance,it will inevitably lead to the low tire quality,high failure rate and short service life.At present,the radial tire building machine is developing in the direction of high precision and high speed,which puts forward higher requirements for the static and dynamic performance of the driving box of the radial tire building machine.However,the driving box of the radial tire building machine is still designed and produced based on the traditional empirical analogy method,and the problems can’t be found until the real product is produced,which is not conducive to shortening the research and development cycle and reducing the cost.Therefore,it is necessary to introduce the finite element analysis method into the design process.In this paper,the driving box of SR-10 radial tire building machine is taken as the research object,and the static and dynamic characteristics are analyzed from the perspective of the whole machine.Combined with the rigid-flexible coupling analysis,whether its stiffness and strength meet the requirements is checked,and the structure that has great influence on the performance of the whole machine is identified.The lightweight design is carried out to reduce the production cost without reducing the performance of the whole machine,which provides a reference for the iterative updating process of the product.The main research contents of this paper are as follows:(1)On the premise of ensuring the accuracy of finite element analysis,the whole model of the driving box is reasonably simplified in Solid Works.The equivalent contact area method is used to deal with the main bolt joint surfaces in the driving box,and a finite element model which can reflect the mechanical properties of the whole machine is established by a reasonable mesh generation method.The static characteristics of the whole machine under self-weight and load conditions are studied,and its static stiffness and static strength are checked.(2)The finite element modal analysis of the driving box of the radial tire building machine is carried out,and the modal test points are arranged according to the modal shapes.The "hammer method" modal test is carried out on the driving box of the radial tire building machine,and the results of modal test are compared with those of finite element analysis to verify the accuracy of finite element model.The harmonic response analysis of the driving box of the radial tire building machine is carried out,and its dynamic performance is evaluated.Combined with the modal shapes of the whole driving box,the structural parts that have the greatest influence on the dynamic performance of the driving box are located.(3)Based on the multi-body dynamics theory,the main supporting parts of the radial tire building machine are set as flexible bodies,and the rigid-flexible coupling dynamics simulation analysis of the driving box of the radial tire building machine is carried out to check whether the dynamic stiffness,dynamic strength and spindle stability of the whole machine meet the requirements under working conditions.The box and the pedestal are set as flexible bodies,respectively,to explore the influence of its flexible deformation on the dynamic performance of the whole machine,and further determine the structural part that have great influence on the dynamic performance of the whole machine,which provides a basis for the optimization of the driving box of the radial tire building machine.(4)Without reducing the original static and dynamic performance of the whole machine,the key structure of the driving box is designed to be lightweight.Firstly,topology optimization of the pedestal of the driving box is carried out by using the variable density method,and the geometric model of the pedestal is reconstructed by selecting the appropriate ribs according to the topology optimization results.Appropriate size variables are screened through sensitivity analysis,and multi-objective optimization is carried out based on RBF approximation model and NSGA-II algorithm,finally a set of optimal size variables is obtained under the condition that the constraints are satisfied.The analysis and verification of the improved driving box of the the radial tire building machine show that the optimized pedestal not only reduces the quality,but also improves the dynamic performance of the driving box while maintaining the original static performance.