Abstract: A friction stir welding device (1) includes a workpiece disposition unit (2) at which workpieces (W) is disposed, a main body section (3) disposed at a surface (W4) of the workpieces (W) disposed at the workpiece disposition unit (2), a tool holding unit (4) formed in the main body section (3) to enable advance and retreat in a direction facing the workpieces (Z), which is a direction approaching and separating from the workpieces (W) disposed at the workpiece disposition unit (2), and configured to hold a tool (100), and a support medium (5) formed to satisfy a predetermined relative positional relationship in the direction facing the workpieces (Z) with respect to a first shoulder surface of the tool (100) attached to the tool holding unit (4) and configured to support the tool holding unit (4) on the surface (W4) of the workpieces (W) disposed at the workpieces disposition unit (2).

Abstract: A machine tool includes a machine tool main body, a ram which is supported with respect to the machine tool main body in a movable manner, a main shaft which is supported by the ram in a drivable and rotatable manner, an attachment which can be attached to and detached from a tip end portion of the ram and includes a driving shaft rotated according to rotation of the main shaft and a tool provided on the driving shaft, and a NC device which performs a numerical control based on machining data, and performs machining of a processing target. The control method of a machine tool includes a step of decreasing at least one of a ram overhang amount or a feeding amount when stress applied to the attachment is larger than allowable stress of the attachment based on a machining condition including a diameter, a depth of cut, and a feeding amount of the tool, and information including the ram overhang amount, a shape of the attachment, and a material of the processing target.

Abstract: In a machine tool, a column base (12) is supported on a bed (11) movably in a horizontal direction, and a column (13) is installed vertically on the column base (12). A saddle (14) is supported on a side of the column (13) movably in a vertical direction, and a ram stock (15) is supported on the saddle (14) movably in a horizontal direction. A main spindle (16) is rotatably supported by the ram stock (15). A weight (22) is supported in the column (13) movably in a direction parallel to the ram stock (15), so that the weight (22) can be moved horizontally by a servo motor (23). An NC device (25) moves the weight (22) by the servo motor (23) synchronously with a movement of the ram stock (15), to adjust balance of the column (13), thereby enabling to reduce the size of an apparatus and realize space saving.

Abstract: It is intended to provide a machining tool provided with a ram, which has a simple structure and an inexpensive device cost, and is capable of correcting a deflection of a tip of a main shaft unit caused by extending the ram. A deflection correction device for a ram 1 in a machining tool which is provided with a saddle 13 moving vertically along a guide of a column 14 and the ram 1 housing a main shaft unit 15 and being fitted in the saddle 13 slidably in a horizontal direction. The device may include a plurality of hydrostatic bearings 2a via which the saddle 13 is supported by the column 14 in a longitudinal direction of the column 14, and a control unit 10 which controls a hydraulic pressure of the hydrostatic bearing 2a in accordance with a vertical displacement of the ram 1 to maintain a straightness of the ram 1 in a direction of a main shaft of the ram 1 so as to correct a misalignment of the main shaft unit 15 by an inclination of the saddle 13 caused by controlling the hydraulic pressure.

Abstract: A friction stir welding device (1) includes a workpiece disposition unit (2) at which workpieces (W) is disposed, a main body section (3) disposed at a surface (W4) of the workpieces (W) disposed at the workpiece disposition unit (2), a tool holding unit (4) formed in the main body section (3) to enable advance and retreat in a direction facing the workpieces (Z), which is a direction approaching and separating from the workpieces (W) disposed at the workpiece disposition unit (2), and configured to hold a tool (100), and a support medium (5) formed to satisfy a predetermined relative positional relationship in the direction facing the workpieces (Z) with respect to a first shoulder surface of the tool (100) attached to the tool holding unit (4) and configured to support the tool holding unit (4) on the surface (W4) of the workpieces (W) disposed at the workpieces disposition unit (2).

Abstract: In a machine tool or a processing method, a column base (12) is supported on a bed (11) movably in a horizontal direction, and a column (13) is installed vertically on the column base (12). A saddle (14) is supported on a side of the column (13) movably in a vertical direction, and a ram stock (15) is supported on the saddle (14) movably in a horizontal direction. A spindle (16) is rotatably supported by the ram stock (15), a damper (21) is provided on the ram stock (15), and an O-ring (22) is provided between the ram stock (15) and the damper (21), so that the O-ring (22) can be deformed by a pressing member (23). An NC device (24) can adjust a deformation degree of the O-ring (22) by the pressing member (23) depending on a mass of an attachment (17). Therefore, vibration of a tool can be effectively damped by changing a natural frequency according to replacement or movement of the attachment.

Abstract: In a machine tool, a column base (12) is supported on a bed (11) movably in a horizontal direction, and a column (13) is installed vertically on the column base (12). A saddle (14) is supported on a side of the column (13) movably in a vertical direction, and a ram stock (15) is supported on the saddle (14) movably in a horizontal direction. A main spindle (16) is rotatably supported by the ram stock (15). A weight (22) is supported in the column (13) movably in a direction parallel to the ram stock (15), so that the weight (22) can be moved horizontally by a servo motor (23). An NC device (25) moves the weight (22) by the servo motor (23) synchronously with a movement of the ram stock (15), to adjust balance of the column (13), thereby enabling to reduce the size of an apparatus and realize space saving.