www.melanexjou.fora.pl

[loiwtjsf]

,[link widoczny dla zalogowanych]
Tube-shaped part skew rolling three-dimensional nonlinear finite element analysis


Between the two convex edges of the metal, due to axial flow obstruction by the convex edge of the radial flow, the axial compressive strain and radial tensile strain. As the role of friction by rolling the surface of hafnium metal will shear flow. As for rolling, roll convex edge gradually increased, the degree and extent of plastic deformation increases, and gradually penetrate into the rolling of the inside wall of the rolling deformation also occurs with the external thread, to the metal filled hole , rolling completely formed. 4.2 Stress Analysis of Figure 4 is rolling cross section of the stress distribution, rolling the top of the upper part of the screw threads,[link widoczny dla zalogowanych], the lower end of the screw threads. :! Figure 4 rolling cross section of the stress distribution a) a {b) mouth ic) Port Id) Fig. 4Thestressdistributioninthecrosssectionoftheworkpieee. It can be seen from Figure 4, the stress distribution and the cross section of the path is somewhat similar to compression ring. Role in the rolling roll at the outer wall for the three-stress state, the shear wall at a greater tensile stress, which is prone to hollow wall rolling horizontal position at the crack, have a greater tangential wall tension stress, wall shear stress was. Role in the mid-point of both sides of the roll changing shear stress. Oblique hollow pieces of rolling process of rolling the major quality problems have a vertical crack, in particular the rolling end of the hole wall. From the above analysis. Hole wall can be drawn because the cracks: the rolling process. Two hollow rolling rolling roll, the inner and outer wall of metal produced by the tangential bending tensile stress. Rolling thinner wall thickness, the greater the bending wall,[link widoczny dla zalogowanych], the greater the tangential tensile stress, so easier to crack. This is the case with the actual rolling is the same. Rolling crack tip is not the end of the outside of the outer end, so here is compressed, resulting in a large tangential tensile stress. To prevent the end of the crack tip can be made of inverted cone, rolling as the outer end to prevent cracks. Volume 7, Mechanical Engineering 5 Conclusion In this paper, LS-DYNA3D software and its secondary development of the ramp created threads rolling bolt of finite element analysis model, fully consider the characteristics of forming a cross rolling,[link widoczny dla zalogowanych], realistic simulation of screw bolt cross rolling forming process, has been rolling stress and strain distribution within and effectively reveals the uneven deformation of the details of the rolling, to improve the rolling quality, design and develop a reasonable process mill, providing a theoretical basis,[link widoczny dla zalogowanych], and further for the future cross rolling and cross wedge rolling of the theory provides an important reference. References [1] Zheng-Huan Hu, Xu Concord, Shad per book. Oblique wedge rolling mill with the principle, process and equipment. Accompany King Press, 1985 [2] JIANG Wei City, Dinggang Yi. ANsYs / Ls-DYAN basis and use program algorithm. ANSYS / LS-DYNA technical support center in China, 1998,3 [3] JonasEdherg. Lars-ErikLindgren. Thewedgerollingtest, JournalofMaterialsProcessingTechnologyt1994 ,42:227-238 [4] Programmer'sManualforANSYS5 .4 THREE-DIMENS10NN0NLINEARFINITEELEMENTANALYSIS0FSKEWR0LLING0FTUBULARPARTZHAOJun - JieHuZheng - Huan (UniversityofScienceandTechnologyBeijing100083) Al ~ tract: Thenonlinearfiniteelementanalysisonhelicalskewrollingofroundthreadtubeisprovidedinthispaper. Thedistributionofstressandstrainwkhintheworkpieceareobtained. Thisprovidesreliablefoundationforthedesignofthediesanddeterminationofthetechnicalparameters. Keywords: skewrolling; roundthreadtube; nonlinearfiniteelementanalysis

相关的主题文章：


[link widoczny dla zalogowanych]

[link widoczny dla zalogowanych]

[link widoczny dla zalogowanych]