Research On Precision Rolling Forming And Microstructure Evolution Of Special Ring

With the development of high and new technology and the upgrading of manufacturing industry,the application of special ring is more and more widely used in the fields of automobile,ship,energy,aviation and weapon.Special ring parts are profile rings and often used to deform materials.Because of the complexity of the cross-section shape and the difficulty of deformation of the material,the forming of the special ring is difficult and the cost is high.The processing methods of special ring mainly include forging forming and ordinary ring rolling.It is characterized by high energy consumption,low material utilization and low production efficiency in the process of forging.Although the ring rolling can reduce energy consumption,it is necessary to simplify the complex section profile to the simple section ring,which will lead to the increase of the consumable material and the later machining work.In this paper,the asymmetric groove-section ring was taken as the research object,two kinds of ring blanks with equal wall thickness and variable wall thickness were designed according to two principles of equal in volume and similar in shape to roll asymmetric groove-section ring.The ring rolling process was simulated by using the ABAQUS and the step filling law and the dimension error of the rolled ring were analyzed.The results showed that “the variable wall thickness” ring blank with the volume correction coefficient in the range of 1 <? <1.1 was the optimal ring rolling blank.Then the blank design method was verified by the common rolling experiment for the asymmetric groove-section ring.Subsequently,this paper also studies the ring rolling method for asymmetric groove-section ring.Because of the deep groove parts,the initial volume of distribution has been unable to meet this kind of ring rolling.So single feed and double feed composite ring rolling were proposed.The metal flow law of the asymmetric groove-section ring during single-feed and double-feed composite rolling were revealed by The ring rolling process was simulated by using the ABAQUS.By analyzing size precision rolled ring,The results showed that the single feed composite ring rolling and double feed composite ring rolling were suitable for rolling asymmetrical groove-section rings.And the feasibility of the two ring rolling methodswere verified by the corresponding experiments.Based on the above research results,the macroscopic deformation and microstructure evolution law of asymmetric groove-section ring rolling was studied.Through secondary development,a reliable material subroutine was established on the SIMUFACT software for FE simulation.By analyzing the distribution and evolution rules of the strain,temperature,dynamic recrystallization volume fraction and grain size,the macroscopic deformation and microstructure evolution of the single-feed composite rolling process of the asymmetric deep groove ring were analyzed.Finally,the relationship among rolling parameters-geometry-organization state was obtained.The above research results can effectively improve the material utilization,reduce product cost and save precious metal resources for asymmetric groove-section ring.It is of great significance to improve the manufacturing level and the production efficiency of the asymmetric groove section ring in the fields of machinery,automobile,energy,aerospace and other fields.