DEVICE FOR DETERMINING THE CENTRE OF STIFFNESS IN MILLING MACHINES AND METHOD FOR DETERMINING THE CENTRE OF STIFFNESS

摘要

The invention relates to a system for determining the centre of stiffness in milling machines, which is characterized by a device and method. The claimed system is used both when using a tool gripping device and when using a workpiece fixing device, and the centre of stiffness is determined based on the transducer position in relation to the measurable mark, so that in case of a device (6) for gripping the workpiece (1), the system is built so that, along a direction (x), some uniaxial displacement transducers (5) are fixed in a support (2), along a direction (y), some uniaxial displacement transducers (10) are fixed in a support (9) and, along a direction (z), some uniaxial displacement transducers (7) are fixed in a support (8), along each direction there being placed two transducers of the same type, fixed in the same type of support, so as to maintain a distance (a) therebetween, a force transducer (4) being positioned by means of a fixing support (3) along each direction (x, y, z). The claimed method for determining the stiffness centre consists in finding the intersection point of the displacement vectors generated as a consequence of the application of a force loading on said direction, the two vectors and the intersection point defining a plane, and thereby determining a plane along each loading direction (x, y, z), finally defining three planes of displacement corresponding to the three directions.