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Abstract: A
new heat transfer coefficient model with part region is presented, and a
plain strain component is regarded as the study objective in this model.
Five design variables are selected to do the design of central composite
experiment with five factors and five levels. The levels of design
variables attained from the experiment design are regard as the
technical parameters of gas quenching to simulate the gas quenching
process using the FEM software clesigned by ourselves. Some mathematical
models of response surface are attained. These mathematical models show
the dependencies of distortion, average equivalent residual stress, the
standard deviation of surface hardness and average surface hardness with
respect to the design variables. The optimization model of multi-objetives is presented, and the model is optimized by the non-linear method.
The optimization data are regard as the technological parameters to
simulate the gas quenching process using the FEM software. The quenching
results of after optimization are compared with those of before
optimization. The comparison shows that the quenching quality using
technological parameters after optimization is much better than the
quenching quality using technical parameters before optimization. All
the items of evaluation objectives are improved after optimization.
Key words: Gas quenching Optimization method
Technological parameter Multi-objective
CLC No: TG153
国家杰出青年科学基金(50425517)、教育部跨世纪优秀人才基金(01030329)资助项目. Received 20060118, received in revised form 20060820
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