Research On Shape Control Theory Of Large Conical Barrel Rolling

With the advent of the low-carbon era,the international energy industry structure began to shift to clean energy,which promoted the rapid development of power,petrochemical,coal and chemical industries.The demand for large conical tubular parts,which are the key components of nuclear power equipment and petrochemical equipment,is also increasing.Large conical barrel joints are mainly used in high temperature,corrosion and high pressure environment,and the size of the parts is huge,and the product quality and performance requirements are very high.At present,they are mainly formed by forging,with large energy consumption,poor quality and low efficiency.Therefore,how to manufacture large conical barrel joints with high quality and high efficiency is the bottleneck problem that restricts the development of clean energy equipment technology in China.Rolling forming is an efficient forming method.Compared with forging forming,it has the advantages of high efficiency,high material utilization and good mechanical properties.In this paper,the deformation mechanism and size and shape control of large conical barrel section during rolling are studied.The main contents include:(1)Based on the principal stress method,the rolling force model of large conical barrel is established,and the finite element simulation of large conical barrel rolling is established based on ABAQUS.The rolling force calculated by the principal stress method and the finite element method is compared and analyzed to verify the accuracy of the model.Meanwhile,the distribution of rolling force per unit and the main process parameters in the rolling process of large conical barrel are studied.The influence of rolling force and energy parameters.(2)Based on the finite element simulation method,the rolling process of large conical barrel section is simulated by finite element method.The effects of the rolling feed speed and feed per revolution on the roundness and taper dimension accuracy of large conical barrel section are studied,and the rolling process parameters of large conical barrel section are optimized.(3)The influence of position control method and force control method on the roundness and taper of large conical barrel section rolling was studied.The kinematic trajectory equation of position control guide roll and the mechanical model of force control guide roll are established.The optimum position angle of position control guide roll and the optimum force of force control guide roll are obtained by finite element simulation.A force control mode of position control guide roll is proposed,which can effectively control the rolling shape of large conical cylinder.