Abstract: Provided is a gear grinding machine which can dress a grinding stone while a gear is held attached to the machine regardless of the size of the gear. To this end, the gear grinding machine (1) engages and mutually rotates a work (W) and the grinding stone (17) to thereby grind the work (W), wherein the gear grinding machine is equipped with a turning table (22) which holds the work (W) and rotates around a work rotating shaft (C), and a pivot table (31) which is pivotably supported around the work rotating shaft (C); and a dresser (40) which is capable of dressing the grinding stone (17) is provided on the pivot table (31), the pivot table (31) being pivoted to move the dresser (40) between a dressing position (D1) and a retreat position (D2).

Abstract: A gear grinding machine wherein a tooth alignment operation is performed prior to grinding, is equipped with a workpiece processing rotation shaft (22) which rotates a workpiece (W1) located at a workpiece processing position (P2); a workpiece swing device (30) whereby a tailstock (50) that holds the workpiece (W1) is swung between a workpiece replacement position (P1) and a workpiece processing position; a workpiece alignment rotation shaft (52) which rotates the workpiece held by the tailstock (50); and a tooth alignment sensor (43) that detects the rotation phase of the workpiece, which was rotated by the workpiece alignment rotation shaft. Before the workpiece held by the tailstock is placed at the workpiece processing position, the rotation of the workpiece alignment rotation shaft is controlled on the basis of the rotation phase detected, so that the workpiece will engage with a threaded grinding stone (16).

Abstract: Provided is a gear grinding machine which can dress a grinding stone while a gear is held attached to the machine regardless of the size of the gear. To this end, the gear grinding machine (1) engages and mutually rotates a work (W) and the grinding stone (17) to thereby grind the work (W), wherein the gear grinding machine is equipped with a turning table (22) which holds the work (W) and rotates around a work rotating shaft (C), and a pivot table (31) which is pivotably supported around the work rotating shaft (C); and a dresser (40) which is capable of dressing the grinding stone (17) is provided on the pivot table (31), the pivot table (31) being pivoted to move the dresser (40) between a dressing position (D1) and a retreat position (D2).

Abstract: Provided is a gear processing machine which has a simple configuration, and is capable of processing a gear with high accuracy. For this purpose, a gear grinding machine wherein a tooth alignment operation is performed prior to grinding, is equipped with a workpiece processing rotation shaft (22) which rotates a workpiece (W1) located at a workpiece processing position (P2); a workpiece swing device (30) whereby a tailstock (50) that holds the workpiece (W1) is swung between a workpiece replacement position (P1) and a workpiece processing position (P2); a workpiece alignment rotation shaft (52) which rotates the workpiece (W1) held by the tailstock (50); and a tooth alignment sensor (43) that detects the rotation phase of the workpiece (W1), which was rotated by the workpiece alignment rotation shaft (52).

Abstract: Provided is a gear matching device which performs gear matching to establish a rotational phase relationship between a grindstone (13) and a gear-shaped workpiece (W) in which the grindstone and the workpiece can mesh with each other, before gear machining is performed by causing the grindstone and the workpiece to mesh with each other, and by then relatively rotating the grindstone and the workpiece, the gear matching device including: a tail stock (16) which is supported to be movable in the axial direction of the workpiece, and by which the workpiece is pressed against a rotary table (18) to be rotatably held, the rotary table rotating the workpiece about the axis thereof; and a sensor (33) which is provided to the tail stock, and which faces the workpiece to detect the rotational phase thereof, when the tail stock holds the workpiece.

Abstract: The index table includes a rotary table for setting a workpiece for a machine tool; a rotary table shaft fixedly provided on the rotary table; a driving motor mechanism, which is a driving source; and a planetary roller speed-reduction mechanism having a sun roller, which is a motor output shaft of the driving motor mechanism, a ring fixed to the speed-reduction mechanism, a plurality of planetary rollers arranged at equal angular intervals between the sun roller and the ring in a pressurized state, and a planetary roller harness that fixedly supports a plurality of planetary roller shafts pivotally supporting the planetary rollers in a rotatable manner and is fixedly provided coaxially with the rotary table shaft.

Abstract: Provided is a gear matching device capable of shortening time taken for the gear matching, and also to provide a gear machining apparatus using the gear matching device.

Abstract: There is provided a built-in type index table in which a power transmitting means scarcely has backlash and, at the same time, the space and cost can be saved. The index table includes a rotary table for setting a workpiece for a machine tool; a rotary table shaft fixedly provided on the rotary table; a driving motor mechanism, which is a driving source; and a planetary roller speed-reduction mechanism having a sun roller, which is a motor output shaft of the driving motor mechanism, a ring fixed to the speed-reduction mechanism, a plurality of planetary rollers arranged at equal angular intervals between the sun roller and the ring in a pressurized state, and a planetary roller harness that fixedly supports a plurality of planetary roller shafts pivotally supporting the planetary rollers in a rotatable manner and is fixedly provided coaxially with the rotary table shaft.

Abstract: A gear grinding machine, a method for dressing a threaded grinding wheel, and a method for grinding a work are disclosed. A dressing tool is rotated in a vertical plane, with its position being fixed. The position of a threaded grinding wheel is NC-controlled, whereby the dressing tool is brought into contact with the starting point of the thread of the threaded grinding wheel at a somewhat lower surface of the circumferential surface of the threaded grinding wheel and, in accordance with the rotation of the threaded grinding wheel, the position of contact of the dressing tool with the threaded grinding wheel is moved along the circumferential surface of the threaded grinding wheel.

Abstract: A gear grinding machine, a method for dressing a threaded grinding wheel, and a method for grinding a work are disclosed. A dressing tool is rotated in a vertical plane, with its position being fixed. The position of a threaded grinding wheel is NC-controlled, whereby the dressing tool is brought into contact with the starting point of the thread of the threaded grinding wheel at a somewhat lower surface of the circumferential surface of the threaded grinding wheel and, in accordance with the rotation of the threaded grinding wheel, the position of contact of the dressing tool with the threaded grinding wheel is moved along the circumferential surface of the threaded grinding wheel.

Abstract: To correct the tooth profile error of a ground gear, the wheel angle of a threaded grinding wheel is modified by dressing the threaded grinding wheel by a dressing device. To correct the helix form deviation of a ground gear, namely, to modify the helix angle of the gear, synchronization between the moving motion in the Z-direction of the threaded grinding wheel and the rotary motion of a table for installation of the gear is adjusted. When the helix form deviation is corrected by adjustment of the synchronization, a tooth profile change inevitably occurs. In consideration of the tooth profile change, correction of the tooth profile error by dressing is made.

Abstract: To correct the tooth profile error of a ground gear, the wheel angle of a threaded grinding wheel is modified by dressing the threaded grinding wheel by a dressing device. To correct the helix form deviation of a ground gear, namely, to modify the helix angle of the gear, synchronization between the moving motion in the Z-direction of the threaded grinding wheel and the rotary motion of a table for installation of the gear is adjusted. When the helix form deviation is corrected by adjustment of the synchronization, a tooth profile change inevitably occurs. In consideration of the tooth profile change, correction of the tooth profile error by dressing is made.