钢锭，尤其是大型钢锭通常不能直接轧成所需尺寸的钢材，而先轧成钢坯（开坯），用钢坯再去轧成成品。用来将钢锭加工成钢坯的重型轧机叫开坯机。
对某厂“1+4”热连轧开坯机的扭转振动动态特性进行了研究。
The dynamic properties of the main drive system of a "1+4" hot strip continuous rolling mill are analyzed.
通过有限元分析，研究了950开坯机压下系统球面轴承表面正压力的分布情况，并据此提出了相应的改进措施。
The positive pressure distribution on the bearing surface of screw down system of 950 primary mill was studied using FEM and the corresponding improvement way has been put forward.
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