C. Jiang
,
Y.B. Chen
,
B.S. Wu
,
Q.L. Jin
金属学报(英文版)
Temperature field numerical simulation about he heat treatment process curve of large turbine rotor is presented. With simulation software Deform3D in according to the heat treatment processing of China First Heavy Machinery, the details of temperature change at the different location of the rotor is to be found. Once knowing the temperature field change, the duplex grain defect long time existed in large forgings can be solved with a quantitative analysis instead of only the qualitative one. Precondition for small metal samples is brought to simulate microstructure and grain size change of large rotor according to the numerical simulation result. Also, consistent feature with real manufacture is showed from the physical experiment, so that the simulation can be used to not only improve the products process but also prevent wasting unnecessary energy and shorten process periods. The rotor quality is controlled thoroughly with plenty of experiments data.
关键词:
temperature field
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null
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L.Q. Li
,
Y.B. Chen
,
X.Y. Wang
,
S.Y. Lin
金属学报(英文版)
Laser forming involves heating sheet metal workpiece along a certain path with a
defocused laser beam directed irradiate to the surface. During laser forming, a transient temperature fields is caused by the irradiation and travelling of a laser beam.
Consequently, thermal expansion and contraction take place, and allows the thermal-
mechanical forming of complex shapes. This is a new manufacturing technique that
forming metal sheet only by thermal stress. Therefore, the analysis of temperature
fields and stress fields are very useful for studying the forming mechanism and controlling the accuracy of laser forming. The non-liner finite element solver, MARC, is
employed to solve the thermal-mechanical analysis. Using this model, the stress and
strain distribution of pure aluminum plate with di®erent thickness are analyzed. The
influence of scanning speed on temperature fields and plastic strain of metal sheet under the condition of constant line energy are also presented. Numerical results agree
well with the experimental results.
关键词:
laser forming
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null
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