Dissertation > Excellent graduate degree dissertation topics show

Study on Cross Wedge Rolling Uneven Temperature Field Composite Rolling Elongated Conical Step Shaft

Author: ZhouYuWei
Tutor: JiaChunYu; LiuZhiLiang
School: Yanshan University
Course: Mechanical Engineering
Keywords: two roll cross wedge rolling elongated conical step shaft uneven temperaturefield composite rolling stress-strain
CLC: TG335.19
Type: Master's thesis
Year: 2012
Downloads: 30
Quote: 0
Read: Download Dissertation

Abstract


Cross Wedge Rolling of shaft parts is a new plastic forming technology, which isrolling and forging interdisciplinary subject areas. It has very high production efficiency,higher utilization ratio of the material and low production cost; and was widely used inlarge, medium and small ladder shaft key parts manufacturing, such as railway vehiclesaxles, tractors axle.This thesis mainly studies the two roll cross wedge rolling elongated conical stepshaft,which adopted the uneven temperature field composite rolling method. The shaftcome from a new type of construction engineering equipment,and it also has extensiveapplication space in mechanical engineering field. Because of the finished part too fine toolong and step period of reduction of area larger, when the billet is a solid round bar, it isdifficult to roll forming. For that reason,we adopted composite rolling method that theoutside is tubular product and the inside is core rod.that is to say, using the method ofcross wedge rolling pressure the two part together,and at last meeting the requirementspressure between them.Based on the cross wedge rolling ordinary rolling principle, This thesis focus on theexploration research of cross wedge rolling composite rolling thin step shaft methods.Because two roll hollow rolling easy to produce the workpiece elliptic changephenomenon, and the composite rolling further intensifies the outer sleeve elliptic changetrend for the support effect of Core rod,which result in that after the rolling the finishedproducts can’t meet the requirement for producing certain gap between the two parts. Firstin the mold design through the predecessors’ research to hollow rolling and summary ofthe law, on other hand as far as possible through the improvement process parameters,reduce the elliptic trend. Secondly this article groundbreaking using lower outer sleevetemperature at the same time increase core rod temperature, in other words uneventemperature field method to reduce elliptic change, finally rolled into the finishedproducts.This paper firstly through the DEFORM finite element simulation method proof that the method of uneven temperature field is very effective in two roll cross wedge rollingcomposite rolling,especially to improve the outer sleeve elliptic tendency, reduce the gapbetween shaft sleeve and core rod, increase the core rod’s rolling reduction and strengthenthe metal’s liquidity of core rod. at the end, the paper select a suitable initial temperaturebased on the before research results. Secondly though the uneven temperature fieldcomposite rolling method, simulated rolled the elongated conical step shaft and thoughcontrast round bar solid rolling stress strain rule get the finished part that meet therequirements.

Related Dissertations

  1. Full stress-strain model structure of carbon steel,TU511.3
  2. Computer Analysis of Steel Reinforced Concrete Components,TU311.41
  3. Study on the Triaxial Compression Experiment of the Metamorphic Soft Rock Filler in Shi-Tian Expressway, Western Section of AnKang,U414
  4. The Mechanic Properties and Impact Energy Absorption of Foam-made Loosefill Materials under Dynamic Load,TB484.3
  5. The Study of Duncan-Chang Model of Handan Silty Clay and the Stress-Strain Normalized Relationship,TU432
  6. The tissue homogenization the synthesis reaction AgSnO_2 material process materials stress state,O482.1
  7. Using the finite element method Ti-Si-N superhard nanocomposite mechanical properties of the surface,TB383.1
  8. Study of the Residual Load Bearing Capacity of Steel-concrete Axial Compression Columns after High Temperature,TU398.9
  9. Asphalt Pavement Structure of Three-dimensional Finite Element Analysis,U416.217
  10. Studies of Stress-strain and Instability Mechanism for Horizontal Directional Borehole,TU452
  11. Finite Element Analysis for Piping with Axial Inner Surface Cracks,O346.1
  12. Experimental and Numerical Study on Seepage Mechanism of Rock Failure,TD313
  13. Three-Dimensional Finite Elementanalysis of Steel Liner Reinforced Concrete Bifurcation,TV732.4
  14. Research on the Failure Mechanism of Fractured Rock Mass Using Discontinuous Deformation Analysis,TU452
  15. Formation Mechanism Study and Stability Evaluation of the Complex Geology in New Main Site of Fengjie County,P642
  16. The Mechanical Properties of Plain Weave C/SiC Composite,TB332
  17. Research on Stochastic Damage Constitutive Law of Masonry,TU312.3
  18. Research on the Interaction of Vegetation Root and Soil for Highway Grass Slope,U418.9
  19. The Study on Damage and Failure Numerical Simulation Method for the Tunnel Surrounding Rockmass during Excavation,U451.2
  20. Research on Approximate Calculation Method for the Stress-Strain Response at Notch Tip under Cyclic Loadings,TH165.3
  21. Realization of SPH Program and Numerical Research on Heterogeneity Elastic-Brittle-Plastic Rock Failure Process,TU452

CLC: > Industrial Technology > Metallurgy and Metal Craft > Metal pressure processing > Rolling > Rolling process > Rolling method > Special rolling
© 2012 www.DissertationTopic.Net  Mobile