Optimization of isostatic pressing graphite material forming process by response surface method
In order to find out the best forming process of isostatic pressing graphite material,all factor orthogonal experiment and re-sponse surface experiment were adopted.The results show that the forming pressure,holding time,pressure release rate,the interaction between forming pressure and holding time,holding time and pressure release time have significant impacts on bending strength of iso-static pressing graphite,the mathematical model is well fitted,but the model bending term is significant,indicating that there is an ex-treme value between the high and low levels,and it is difficult to determine the optimal process conditions by orthogonal experiment.While the response surface experiment can be used to fit the isostatic forming process well,the optimal conditions of isostatic forming process determined by the prediction and experimental verification are:molding pressure of 215 MPa,pressure holding time of 18.4 min,pressure relief rate of 1 MPa/s.Under these conditions,the isostatic pressing graphite material has a bending strength of 24.40 MPa,and the results are consistent with the model prediction,which proves that the response surface optimization results are reliable.
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