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本文通过在计算机上模拟固/液界面位置受到控制的整个HRS定向凝固过程、求出使固/液界面稳定在隔热板及其附近时抽拉速度的调节规律。依此规律,利用一个以TP 801 B单板机为核心的控制系统对铸件的HRS定向凝固过程进行实时控制。用Al—4.5％Cu合金试样进行了验证试验。结果表明:受控HRS定向中、固/液界面很快趋近于隔热板并在定向过程中稳定在隔热板附近。对界面位置实行控制能有效提高固/液界面前沿温度梯度及其稳定性;明显改善定向凝固显微组织。
In this paper, the entire HRS directional solidification process under the control of the solid / liquid interface position is simulated on a computer and the regulation of the pullout speed when the solid / liquid interface is stabilized on the heat insulation plate and its vicinity is obtained. According to this rule, a control system with TP 801 B single-board machine as the core is used to control HRS directional solidification of castings in real time. Al-4.5% Cu alloy samples were tested. The results show that in controlled HRS orientation, the solid / liquid interface quickly approaches the thermal shield and stabilizes near the thermal shield during orientation. Controlling the position of the interface can effectively improve the frontal temperature gradient and the stability of the solid / liquid interface, and obviously improve the directional solidification microstructure.