Abstract: A stretch forming system has jaws clamping a workpiece at end edge portions, a die disposed between the jaws and coming into contact with the workpiece, and a plurality of control axes changing relative positions and orientations of the jaws with respect to the die, and has a jaw path calculating unit calculating paths of the relative positions and orientations of the jaws with respect to the die when the workpiece is wrapped onto the die by moving the die in a vertical direction under a restricting condition that the positions and orientations of the jaws are freely changeable except for movement in a vertical direction being regulated, and a control axis operation pattern calculating unit calculating operation patterns of the plurality of the control axes achieving the paths of the jaws.

Abstract: A stretch forming apparatus comprises a pair of jaws for pinching both ends of a work, a die placed between the pair of jaws so as to be in contact with the work, a plurality of control axis for change in positions and postures of the jaws and the die, a rotation center line setting unit for making an operator set rotation center lines for the jaws that are for partial stretch of the work by rotation of the jaws, an operation input unit for rotating the jaws by manual operation about the rotation center lines, and a control unit for synchronously controlling the plurality of control axis so that the jaws rotate in accordance with the manual operation by the operator on the operation input unit about the rotation center lines.

Abstract: In a method for performing a finish machining on a tooth surface of a gear to be machined, in the state that at least one counter gear 2 is meshed with the gear 1 to be machined, both gears are rotated while supplying water or an aqueous solution 4 which contains no abrasive grains to meshing portions of both gears so that a surface having a small surface roughness is formed on the tooth surface of the gear 1 to be machined.