Dynamic Analysis And Lightweighting Of Profile Rolling Mechanism On TRB Plate

At home and abroad,a lot of work has been done on the research of the production method of Tailor Rolling Blanks,and many important theoretical bases have been obtained.However,Profiling Rolling has no relevant discussion and research.Profiling Rolling is a completely new concept.Its rolling process is significantly different from the conventional four-high rolling mill.Because of their different rolling principle,although the research on the rolling forming of TRB plate is mature,the research results can not be used in the process of Profiling Rolling.Therefore,the current research on the process of Profiling Rolling is groundbreaking and enlightening.The ability to produce any continuously varying transition curve difference plate for a Profiling Rolling allows it to meet the market's maximum requirements for various shapes of TRB.However,with the continuous production of thicker and thicker plate size,the corresponding Profiling Rolling device is gradually increasing its size.As a result,the amount of material used in the installation is gradually increased,causing the equipment to be too bulky and thus affecting the rolling accuracy and the production costs.The research on lightweight optimization of the Profiling Rolling equipment will help the plant to start operation as soon as possible,break through the technical barriers in foreign countries,enhance the production efficiency of the poor slab and reduce the production cost.First of all,the rolling process of the Profiling Rolling was simulated by finite element method.The different stages of the Profiling Rolling process were divided and the five-stage theory of the copy rolling was established.The influence of different factors on the rolling force and rolling time in the process of Profiling Rolling was simulated and analyzed.The simulation results showed that the maximum reduction had the greatest influence on the maximum rolling force and had a positive correlation,and had some influence on the rolling time.The correlation between the rolling speed and the rolling time was negative.The friction coefficient had a positive correlation with the weak influence of the maximum rolling force,but had no effect on the rolling time.It should be pointed out that when the friction coefficient is 0,the Profiling Rolling can still be normal.Which is different from the traditional rolling process must have some friction so that the rolling process can be normal.Then,the static structure analysis of the upper template is carried out.The stress and strain response of the upper formwork before light weight optimization is discussed,which prepares the upper formwork and the topological optimization and weight reduction.Based on the response surface model,a multi-objective optimization algorithm was used to find out the optimal size matching scheme.The redesigned upper template reduced its mass by 66.7% while meeting the strength stiffness requirements.Finally,on the basis of the size optimization,the upper template is optimized for its lightweight design.The topologically optimized upper template is statically analyzed to verify that its mechanical properties meet the design criteria.Comparing with the performance indexes of the upper template before and after the topological optimization,it is found that the stiffness of the upper template after the topological optimization meets the design requirements,and the weight of the upper mold reduces by 18.2%.After the size optimization and topology optimization,the cumulative weight of the upper template decreased by 73.6%.By statics analysis and verification,applying the two optimization methods to the same optimization object can reduce the quality to the maximum extent,and at the same time reduce the production cost drastically,and the economic benefits are considerable.