在满足机床加工精度的前提下，尽量选择一个合理的大件刚度值，以达到减小大件外形尺寸及重量的目的。

On the premise that the cutting accuracy of the machine is met, a propriety value of the large parts rigidity is determined to reduce the overall dimension and weight of the large parts.

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此外，本发明有效减小了底架的外形尺寸和重量，进而方便整机转场及安装。

In addition, the external size and the weight of the underframe are effectively reduced to further facilitate transportation and installation of a whole machine.

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