Parallel kinematic structure for a machine tool

摘要

The invention concerns a device for using a parallel structure (S) designed for positioning and displacing a mobile member (100) comprising at least a fixed element, at least a mobile member (100) and at least three actuators (200) each including a fixed part (210) and a mobile part (220), the mobile member (100) consisting of a support-sheath (110) of a tool spindle (111). Said device is characterised in that the parallel structure (S) is arranged such that the spindle (111) axis is horizontal. For this purpose, it comprises balancing means (M) which, enabling said support-sheath (110) to move in rectilinear manner along axes X, Y and Z, maintains the assembly consisting of the support-sheath (110), the spindle (111) and the tool such that the weight of the latter is not transferred on said parallel structure (S). The invention is useful for high-speed machining for machining operations including drilling, counter sinking, tapping or boring.