液态模锻抽芯力形成分析及抽芯力理论公式推导
Theoretical Derivation of Expressions on Core-pulling Force in Liquid Forging
王家宣1， 陈 英2， 姜丽红3， 李 春1
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作者单位：（1．南昌航空大学 航空制造工程学院, 江西 南昌 330063；2.九江国科远大机电有限公司, 江西 九江 330411; 3.江西现代职业技术学院，江西 南昌 330095）
中文关键字：液态模锻； 抽拔力； 包紧力； 理论推导
英文关键字：iquid forging; core-pulling force; clamping force; theoretical derivation
中文摘要：在液态模锻成形孔形件时，通过对液态金属在凝固前后对型芯的作用产生包紧力进行分析；充分考虑可能影响抽拔力的因素，建立力学模型，分别推导出圆形和正多边形截面孔的型芯抽拔力计算公式。它们基本反映了液态模锻成形的特点，以及影响抽拔力的比压、拔模斜度、壁厚和涂料等主要因素。公式不仅适用于液态模锻，也适合金属型铸造和压铸、低压铸造。
英文摘要：The clamping force which the molten metal exerted on the core before and after its solidification was analyzed in liquid forging; taking into account the factors of influencing core-pulling force and setting up mechanical model, the equations used for calculating the core-pulling force with circular and polygonal section core hole were deduced, respectively. They primarily showed the feature of liquid forging process and the major factors of influencing of core-pulling force, such as metal pressure, pattern draft, wall thickness and coating. The formulas are suitable to liquid forging, metal die casting, die-casting and low pressure casting.