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在金属切削中,工艺过程的稳定性在很大程度上依赖于机床床身/基础系统的动态特性;对于要求高精度和特殊表面光洁度的精密机床,这种稳定性特别重要。在设计阶段中,结构的固有频率是预测结构好坏的重要依据;然而,由于支承机器的混凝土基础块和土壤的影响,这些频率会起显著的变化。本文描述和证明在不同振型振动时,决定机床床身/基础系统的固有频率的技术;连接刚度,土壤刚度以及床身与基础两者的刚度的影响都予以考虑。这种设计技术进一步决定有关安装机床在特定位置所需混凝土基础的深度。
In metal cutting, the stability of the process depends largely on the dynamics of the machine bed / foundation system; this stability is of particular importance for precision machine tools requiring high precision and a special surface finish. In the design phase, the natural frequency of the structure is an important basis for predicting the structure’s quality; however, these frequencies vary significantly due to the influence of concrete blocks and soil supporting the machine. This paper describes and demonstrates the technique of determining the natural frequency of a machine bed / foundation system for vibration of different modes; the effects of the stiffness of the connection, the stiffness of the soil, and the stiffness of both the bed and the foundation are taken into account. This design technique further determines the depth of the concrete foundation required to install the machine at a particular location.