Study Of Deflection Vibration In Rolling Of Q235/304 Stainless Steel Bimetallic Ring Parts

Radial rolling of rings is a process of plastic deformation of ring-shaped wo rkpieces in radial direction by ring rolling machine.In practice,the complexity o f the rolling process leads to various defects in the rolling process,which makes the ring rolling unstable and imprecise.The rational control of the guide roll mot ion can reduce the ring deflection vibration and improve the rolling accuracy,rol ling efficiency and rolling stability of the ring.Therefore,the study of guide roll motion control system is of great theoretical significance to solve the problem of deflection vibration in radial rolling of rings.The main research contents are as f ollows:(1)The relationship between core roll depression and forging rate is studied by establishing a forging through model for Q235/304 stainless steel bimetallic r ing parts.The results show that: with the increase of core roll depression,the pla stic zone is generated at one end of the inner ring surface before the outer ring su rface,and the diffusion rate of the plastic zone at the outer end is faster than that at the inner end;under the same depression,the distribution shape of the plastic z one at different axial widths is basically the same,but the distribution area and di ffusion rate are different;the empirical rule cannot effectively assess the forging throughness of the bimetallic ring rolling process;the forging throughness condit ion of the ring is determined: the core roll The minimum feed per revolution is 0.28 mm.(2)By analyzing the data structure and operation process of the finite eleme nt software ABAQUS,the trajectory of the guide roll during the ring rolling proc ess is predicted using mathematical analysis,and the distance between the guide roll and the geometric center of the ring is calculated and transmitted back to the control system as a feedback signal,and the control system adjusts the trajectory of the guide roll according to the feedback signal,and finally establishes the VD ISP script system to keep the ring rolling stable.(3)According to the forging through condition of ring parts and radial rollin g theory,the speed range of driving roll and core roll feed speed range are obtain ed.The VDISP script system is also used to study the deflection vibration in the radial rolling of Q235/304 stainless steel bimetallic rings to investigate whether t he guide roll motion controlled by the VDISP script system can reduce the deflec tion vibration of the rings and improve the forming quality of the rings.Accordin g to the different ways of guide roll control,four rolling models are established:no guide roll,guide roll fixed,guide roll follower and subroutine control models.Under the same rolling conditions,the deflection time curve,dimensional chang e time curve,energy change time curve and roundness error curve of the ring par ts with different rolling models are analyzed,and the study shows that the guide roll control by VDISP script system can reduce the deflection vibration of the rin g parts,so that most of the energy in the ring rolling process can be used for rolli ng and expanding deformation,and the forming quality is better.This technology can improve the forming quality of ring parts,reduce the forming cost of parts,r educe the machining workload,and has important theoretical significance to solv e the problem of deflection vibration in radial rolling of ring parts.