The utility model relates to the technical field of
numerical control grinding machines, and discloses a
numerical control grinding machine for
machining a furnace tube of a
semiconductor vertical furnace, which is characterized in that an auxiliary plate, a sliding plate, a special clamp and other structures are arranged to realize one-time clamping of the furnace tube, the furnace tube is placed above two V-shaped supporting blocks, the V-shaped supporting blocks are used for bearing the furnace tube, and then a
servo motor A is started to drive the furnace tube to rotate; a screw cylinder is driven by a screw rod A to move, three-axis air cylinders on the two sides are started to adjust the position of a V-shaped supporting block, the position of an inner hole of the furnace tube corresponds to the position of a special clamp, a
servo motor A is started again to drive a
saddle to move, the furnace tube is completely arranged on an outer ring of the special clamp in a sleeving mode, and at the moment, air is supplied into an air hole through an external air source; the tensioning head and the air bag head are stressed to expand and abut against the inner ring of the furnace tube, the position of the furnace tube is limited, then the
grinding spindle unit is used for grinding the end face, the outer surface and the spherical top face of the furnace tube, and the effect of improving the production efficiency is achieved.