A simple machine tool including a relatively simple shaped turret having as many tool attachment parts as possible even when a cutout part for a movement path for a main spindle is provided. A machine tool includes a first main spindle, a second main spindle, a first turret having tool attachment parts, a second turret having tool attachment parts, and a controller having an indexing device. An edge of a cutout part formed in the second turret is a straight line in a direction crossing each side of a regular dodecagon centered at a turning center of the second turret, as seen in a Z axis direction, and each tool attachment part is disposed according to each side left in the regular dodecagon cut off by the cutout part.

A simple machine tool including a relatively simple shaped turret having as many tool attachment parts as possible even when a cutout part for a movement path for a main spindle is provided. A machine tool includes a first main spindle, a second main spindle, a first turret having tool attachment parts, a second turret having tool attachment parts, and a controller having an indexing device. An edge of a cutout part formed in the second turret is a straight line in a direction crossing each side of a regular dodecagon centered at a turning center of the second turret, as seen in a Z axis direction, and each tool attachment part is disposed according to each side left in the regular dodecagon cut off by the cutout part.

A machine tool includes: a joint portion processing control means for controlling the processing of the joint portion in a joined workpiece such that a first workpiece is gripped by a grip section, and a predetermined region extending from a joint portion of a joined workpiece toward a second workpiece is processed over a range of not less than a predetermined width to have an outer diameter of not more than an outer diameter of the first workpiece; and a movement control means for controlling the movement of the joined workpiece so as to slidingly move the joined workpiece relative to the support section, from a state in which the first workpiece is supported by the support section, up to a state in which the second workpiece is supported by the support section.

A machine tool includes: a joint portion processing control means for controlling the processing of the joint portion in a joined workpiece such that a first workpiece is gripped by a grip section, and a predetermined region extending from a joint portion of a joined workpiece toward a second workpiece is processed over a range of not less than a predetermined width to have an outer diameter of not more than an outer diameter of the first workpiece; and a movement control means for controlling the movement of the joined workpiece so as to slidingly move the joined workpiece relative to the support section, from a state in which the first workpiece is supported by the support section, up to a state in which the second workpiece is supported by the support section.

A machine tool comprising: a first spindle; a second spindle provided on a rear headstock to face the first spindle; a barstock supply unit for supplying an elongate rod to the first spindle; and a processing means including a tool for processing the barstock, characterized in that the machine tool further comprises: a workpiece clamp device provided on the rear headstock and adapted to grip a second material comprised of the barstock that has been removed from the first spindle as an old material; and a joining means for joining opposite end portions of the second material gripped by the workpiece clamp device and of a first material gripped by the first gripping means and comprised of a barstock newly supplied by the barstock supply unit, thereby to integrate the second material and the first material into a single barstock.

A workpiece processing assembly with multiple working operations includes a working platform, a first positioning device disposed thereon, a second positioning device situated relative to the first positioning device, a first turning device situated beside the first positioning device, a second turning device situated beside the second positioning device, and a controlling device. The turning devices each are equipped with at least two processing tools. A first transverse slide rail disposed on the working platform serves to adjust the distance between the positioning devices, thereby clamping at least one workpiece firmly. Two longitudinal slide rails respectively disposed on the working platform serve to adjust the distance between each turning device and each corresponding positioning device, thereby moving the processing tools to a proper processing position. Thus, the inconvenience caused by replacing the processing tools during the turning process is prevented, and the processing efficiency is greatly increased.

One or more aspects of the present disclosure provide articles of manufacture and components of articles that incorporate an optical element that imparts structural color to the component or the article. The component comprises a cured or curable material, and can include or be made to have a textured surface.

A machine tool (1) includes: a front spindle (10) having a front chuck (12); a rear spindle (20) having a rear chuck (22); a controller (50) configured to cause the rear chuck (22) to perform a fastening operation for fastening a work (W) fastened to the front chuck (12) to the rear chuck (22); and a detector (60) configured to detect an abnormality caused by the fastening operation by the rear chuck (22), based on measurement data associated with a vibration of at least one of the front chuck (12) and the rear chuck (22).

Disclosed is a friction welding method including: a heating step wherein, in relation to joining surfaces (S1, S2) defined by opposite end surfaces of a pair of materials (W1, W2), the pair of materials (W1, W2) are moved from a state in which their axes are unaligned with each other, in a direction for aligning the respective axes with each other, to a prescribed position where the joining surfaces (S1, S2) are brought into contact with each other and friction heated; and a pressure contacting step wherein the pair of materials are brought into pressure contact with each other. The method is characterized in that the heating step and the pressure contacting step are carried out while rotating each of the materials (W1, W2) at the same rotation speed in the same direction, as seen from one side in the axial direction.

One or more aspects of the present disclosure are directed to bladders that incorporate a multi-layer optical film that impart a structural color to the bladder. The present disclosure is also directed to articles including the bladders having a multi-layer optical film, and methods for making articles and bladders having a multi-layer optical film.