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600MW Steam Turbine Rotor Forging Process Analysis

Author: ZuoJie
Tutor: LiWeiMin
School: Yanshan University
Course: Materials Processing Engineering
Keywords: Loose Numerical Simulation Stretching Upsetting
CLC: TG316.2
Type: Master's thesis
Year: 2010
Downloads: 159
Quote: 1
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Abstract


The results show that large forgings , compacting loose internal defects than ingot forging co empty class of defects is more difficult. In this paper, numerical simulation and physical simulation methods combined 600MW steam turbine rotor forging loose inside the compaction process is studied , the findings deepen the awareness of this issue , for a more rational rotor forging process has certain reference value. First, using the finite element simulation software DEFORM , loose having artificial defects billet stretching process simulation study has been a long process of pulling loose density and osteoporosis district shape variations , gives long pull loose during deformation parameters on defect compaction , simulation results and experimental data relevant literature in good agreement . For large rotor loose compaction finite element analysis model was established , in accordance with existing rotor forging process card deformation parameters for a loose compaction simulation , obtained with a single loose area density reduction anvil relationship stretching loose during the distribution of the density and degree of compaction and the loose relationship between the degree of deformation . Obtained through simulation , after the end of the first stretching (forging ratio equal to 1.47 ) , the average relative density of loose area of 85% . Right after stretching simulations found chamfering , chamfering on the loose compaction no substantive impact . By upsetting simulation , reached a different upsetting process for compacting loose defects in different parts of validity : Located near the end of the loose, tapered plate compaction effect upsetting upsetting effect than the flat , central portion of the workpiece loose defect , two methods compaction opposite effect . According to results of this study , twice on stretching rotor forging , upsetting forging cycle after the density of loose area of the base material can achieve a considerable level . So, after two upsetting pull the rotor forging forging forging emphasis should be placed on the final shape , size, finish and subsequent fire sub- forging on the uniformity of plastic deformation .

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metal pressure processing > Forging, forging and blacksmith > Forging process > Free forging (non- forged )
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