Design Method New Three-roller Pilger Heterosexual Surface And Analysis Of Rolling Effect

Cold-rolled seamless pipe is a kind of long steel with hollow interior and weldless exterior,which is widely used in petrochemical,marine engineering,aerospace and other fields.After decades of development,domestic cold-rolled seamless pipe production capacity has reached the top of the world,and its products are concentrated in the middle and low-end market,making the phenomenon of overcapacity in the middle and low-end cold-rolled seamless pipe market,but the high-end pipe market still has good development prospects.As the market-oriented and application scenarios increase the requirements for product specifications(increased diameter and wall proportion),product precision(roundness,straightness,surface finish)and product performance(nickel-based alloys,duplex stainless steel,etc.),the most common Two-roller tapered hole pattern and three-roller circumferential and co-circular hole pattern of domestic cold-rolled pipe mills can hardly continue to meet the production demand.Based on this,this paper takes the two-roller conical hole design formula as the research object,studies the influence of each key parameter on the rolling forming effect,combines the three-roller circumferential homocircular hole section design method,proposes a new three-roller pilger surface configuration hole design theory,through the finite element simulation of the mathematical model,the two-roller pilger and the new three-roller pilger rolling effect is analyzed and compared,then studies the influence of different design parameters on the new three-roller pilger rolling effect,provides the theoretical basis for the optimization of the new three-roller pilger surface configuration hole design theory,the main research results are as follows:(1)Construct the new Three-roll pilger surface configuration hole design formula,and visualize and program the proposed new Three-roll pilger surface configuration hole design theoretical formula using the visual programming language combined with Visual Basic.At the same time,an automatic modeling program is written in Visual Basic to realize the automatic design and modeling of the new Three-roll Pilger surface configuration hole type rolls,which greatly improves the design efficiency.(2)The boundary conditions of motion,friction and contact are set with the actual production process parameters to achieve a complete simulation of the rolling process.By comparing the simulation results of Two-roll conical hole rolling and new Three-roll Pilger surface configuration hole rolling,it can be seen that the new Three-roll Pilger surface configuration hole rolling produces better finished tubes in terms of key data such as three-way stress,residual stress,rolling force,roundness and springback.(3)The hole gap and opening angle of the new Three-roll Pilger surface configuration hole pattern were adjusted separately and the rolling process was simulated digitally.The effect of different hole gaps and opening angles on the rolling effect is compared,and the optimal hole parameters are obtained for this group of rolling specifications to provide a theoretical basis for hole optimization.