VERTICAL PRECISION NUMERICALLY CONTROLLED MACHINE-TOOL AND METHOD OF FLAT SURFACE PROCESSING THEREBY

摘要

The invention relates to the field of machine building, in particular, to vertical precision numerically controlled (NC) machine-tools designed for high-precision and high-speed processing of flat surfaces of workpieces. The vertical precision NC machine-tool comprises a frame (1), an arched structure formed by two vertical posts (2, 3) attached to said frame (1) and interconnected by a transverse beam (4), a table (5) installed between the two vertical posts (2, 3), movable along axes X and Z and connected to a horizontal feed drive (5) of the table, a spindle (7) mounted on the transverse beam (4) and connected to its rotation drive, a faceplate (11) located on the table (5) and rotatable under numerical control; further, an additional multichannel controller, monitoring and control units and actuators are installed, and the processing method further includes program-controlled automated stiffness regulation of the machine-fixture-tool-part system during roughing and finishing in addition to thermal and speed control. The combination of said essential features, the presence of new structural elements in the machine-tool, actions and their modes in the processing method allows increasing the stiffness of the machine-fixture-tool-part system during roughing and reducing it during finishing, decreasing vibrations of the spindle (7), which makes it possible to control not only thermal modes, but also stiffness of the machine-fixture-tool-part system and cutting speed in a range of values unattainable for the prior art.