求翻译：本次毕业设计的零件为末端传动壳体，主要加工过程是精镗孔。我负责设计的是末端传动壳体精镗孔组合机床的总体设计。根据零件的加工要求和特点，拟定出了合理、经济、可靠的工艺方案；确定了组合机床的配置形式和结构方案；确定了切削用量及选择刀具；编制“三图一卡”，保证了精镗孔的加工。是什么意思？

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