What is the concept of the stiffness of the machining center?

The rigidity of the machining center refers to the ability of the machining center system to resist deformation, and the force acting on the machining center is divided into force load and dynamic load. The production of these two forces tests the life and processing quality of the machining center.

The dynamic load does not change with time. For example, the alternating part of impact vibration force and cutting force is called dynamic load. Correspondingly, the stiffness of a machining center can be divided into static stiffness and dynamic stiffness. The latter is part of the vibration resistance. Generally speaking, the stiffness generally refers to the static performance of the machining center (the static stiffness of the machining center).

The machining center is composed of many components. Under load, each structure and joint will produce deformation. These deformations directly or indirectly cause the relative displacement between the tool and the workpiece. This size represents the rigidity of the whole machine. Therefore, the rigidity of the whole machine of a machining center cannot be evaluated by the rigidity of a certain part, but refers to the comprehensive ability of the whole machine tool to resist deformation of each component and joint under static load. The structural rigidity and contact rigidity are evaluated at home and abroad. A lot of research, in the design, it is necessary to consider not only the improvement of the stiffness of each component, but also the stiffness of the joint and the matching of the stiffness between the components. Different parts and joints have different contributions to the rigidity of the machining center. The rigidity should be reasonably allocated or optimized during design to ensure that the machining center can work well for a long time.