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Study on Improving the Quality of Mid-Large Diameter Rolled Pieces during Cross Wedge Rolling by Optimization of Temperature Field

Author: YangHaiJiao
Tutor: ChouPing
School: Yanshan University
Course: Materials Processing Engineering
Keywords: Cross wedge rolling Mannesmann effect Uniform temperature field Large-diameter Slip line Cross round bar pressure
CLC: TG335.17
Type: Master's thesis
Year: 2011
Downloads: 45
Quote: 0
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Abstract


The use of technology to produce cross wedge rolling shaft parts has been widely used in railway and motor vehicle industries . With the rapid development of China 's transportation industry , the diameter of the drive shaft parts significantly increases, research new energy efficient technology , the production of large shaft of the urgent need for the development of society and the market . However , due to the Mannesmann effect , the quality of the core part of cross wedge rolling greatly decreased . To solve this problem , the use of the uniform temperature field , can weaken the heart transversal tensile stress , strengthen the heart , plastic deformation capacity , with a view to improve the quality of the core part of the purpose . Rolling diameter and cross-sectional contraction rate is variable , by means of finite element analysis tool for the theoretical analysis , in order to obtain a reasonably uniform temperature field cooling coefficient for the research objectives , important to explore the practical application of reasonably uniform temperature field significance. Slip line theory to analyze the reduction rate and heart in the second board horizontal pressure circular section bar transverse tensile stress curves for different reduction rates of heart transversal tensile stress to 0:00 diameter aspect ratio . Under the guidance of this curve , with different diameters and different reduction rate variable by the two-dimensional numerical simulation analysis uniform temperature field the ideal outer hard shell thickness and temperature . Through the conclusion , in the rolling diameter section shrinkage , the use of three-dimensional numerical simulation and analysis under ideal uniform temperature field cross wedge rolling heart stress and strain state , two-roll cross wedge rolling deformation process with the board cross pressure round bar deformation process is not exactly the same . With the increase of section shrinkage , the transverse tensile stress is reduced , but the axial tensile stress is relatively increased , resulting in the average stress almost unchanged . Judgment heart , quality standards , the average stress as the the rolling diameter ideal uneven temperature OTC crusty layer thickness curve . Ideal uniform temperature field analysis results to the rolling diameter , water-cooled heat transfer coefficient and water-cooling time for the study variables , analog reasonable access to non - uniform temperature field for uniform temperature field applied to large diameter shaft of cross wedge rolling processing to provide a theoretical basis .

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metal pressure processing > Rolling > Rolling process > Rolling method > Angular rolling ( cross rolling )
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