To produce ultra-high strength steel hollow parts for reducing the body weight and improving the collision safety of automobiles, a hot stamping process of quenchable steel tubes using ice mandrel and resistance heating was developed. To solve the problem of buckling and low cooling rate during stamping of hollow products, an ice mandrel was inserted in the tube. The effect of the ice mandrel on heating and forming behavior was investigated. Quenchable ice-filled steel tubes were able to heat over austenitizing temperature by adding papers as thermal insulation. Moreover, the ice mandrel simplifies the controlling process by generating a reaction force to prevent the buckling and increase the hardness after die quenching of the ice-filled tubes. Using the ice mandrel with insulating papers is significantly effective to produce ultra-high strength hollow products.

为了生产减轻车身重量并提高汽车碰撞安全性的超高强度钢制空心零件，开发了一种利用冰芯和电阻加热对可淬火钢管进行热冲压的工艺。为了解决在中空产品冲压过程中屈曲和冷却速率低的问题，将冰芯插入到管中。研究了冰芯对加热和成形行为的影响。通过添加纸作为隔热材料，可淬火的充冰钢管能够在奥氏体化温度以上加热。此外，冰芯轴通过产生反作用力来防止充冰管模淬火后的屈曲并增加硬度，从而简化了控制过程。