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提出了修正的板科拉深性能评价指标TLDR＝f（R，n，σs，t，F，μ，rd，rp），即与工艺条件相关的极限拉深比（TechnologicaLimitingDrawingratio），其表达式与LDR类似，TLDR＝D／d。但TLDR把工艺参数也作为变量，这一概念的提出与其值的确定将为实际生产提供真正意义上的指导。由于同时包含了工艺参数与板料的基本机械性能参数，TLDR的理论分析更为烦琐。在前人研究的基础上，导出了TLDR的理论计算公式，该公式可用于TLDR的直接计算，计算结果与实际吻合较好，具有一定工程实用价值。
The modified plateau depth performance evaluation index TLDR = f (R, n, σs, t, F, μ, rd, rp) is proposed, that is to say, LDR is similar, TLDR = D / d. However, TLDR also process parameters as a variable, the concept of the proposed value and its determination will provide real guidance for the actual production. The theoretical analysis of TLDR is more cumbersome because it contains both the process parameters and the basic mechanical properties of the sheet metal. Based on the previous studies, the theoretical calculation formula of TLDR is deduced. The formula can be used for the direct calculation of TLDR. The calculated result is in good agreement with the actual situation and has certain engineering practical value.