The impact of the amplitude parameter upon the experiment calculation is analyzed and the method to determine the amplitude is contributed.

分析振幅参数对实验计算的影响，给出确定振幅的实验方法。

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Impact factors of deep drawing LDR are analyzed. parameter BHF which can not be looked down upon is pointed out. Method of rebuilding single press machine for improving LDR is proposed.

分析了影响板料拉深成形极限拉伸系数的因素，指出压边力参数对LDR具有不可忽视的影响，并给出了改造单动液压拉深压边力控制系统提高LDR的方法。

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