The invention discloses a finishing head for a die repairing
machine tool. The finishing head comprises a shell, a worm wheel, a central gear, an inner gear ring, planetary gears, a planetary carrier, a motor, a
polishing head, a high-frequency
electromagnetic induction coil, a
thermal deformation part, a hand wheel and a worm, wherein the shell is a supporting main body, and the motor drives the
polishing head to rotate. During manual feeding, feeding and retreating of the
polishing head can be realized by rotating the hand wheel and through a fixed-axis
gear train composed of the worm wheel, the central gear, the inner gear ring, the planetary gears, the planetary carrier, a moving shaft, a threaded shaft, a chain, a first chain wheel, a second chain wheel and the worm; during manual feeding, the
moving speed of the polishing head is high, during thermal stress feeding, a feeding sliding block can be pushed rightwards, then the
thermal deformation part is heated through the high-frequency
electromagnetic induction coil, and micro feeding of the polishing head is realized according to the principle of
thermal expansion and cold contraction; and manual feeding can be adopted in idle
stroke, so that the moving time of the polishing head is shortened, and thermal stress feeding can be adopted in finishing of the surface of a die, so that the
machining quality of the surface of the die is improved.