In an example, a method for milling a sink is disclosed. The method includes receiving a metal sheet, positioning the metal sheet in a receiving assembly for a milling machine, and scoring the metal sheet via a cutter of the milling machine. The metal sheet is scored along an axis corresponding to a bend of the sink. The method also includes manipulating the metal sheet to form the sink.

A fixed die and a punch, which moves toward and away from the die, are provided. A series of bulges is formed in sheet metal between depressions and projections of the die and projections and depressions of the punch. In forming, the punch moves toward the die such that the sheet metal is pressed between first convex sections and second and third convex sections of the die and the punch, and subsequently the sheet metal is pressed between fourth convex sections.

A fixed die and a punch, which moves toward and away from the die, are provided. A series of bulges is formed in sheet metal between depressions and projections of the die and projections and depressions of the punch. In forming, the punch moves toward the die such that the sheet metal is pressed between first convex sections and second and third convex sections of the die and the punch, and subsequently the sheet metal is pressed between fourth convex sections.

A method of producing a polygonal closed cross-section structural component includes press-forming a metal sheet into a gutter-shaped pre-processed part with a curved form along its longitudinal direction having plural ridge lines corresponding to corner portions of the polygonal closed cross-section in a cross-sectional form developed by cutting the component at a position corresponding to the ridge line located at the innermost side in the radial direction to provide a flange portion extending along the ridge line at the resulting respective ends, and press-forming the pre-processed part to deform inwardly in the cross-sectional direction at a position of one or more of the plural ridge lines to butt the ridge lines located at the innermost side and the flange portions to each other.

A method of producing a polygonal closed cross-section structural component includes press-forming a metal sheet into a gutter-shaped pre-processed part with a curved form along its longitudinal direction having plural ridge lines corresponding to corner portions of the polygonal closed cross-section in a cross-sectional form developed by cutting the component at a position corresponding to the ridge line located at the innermost side in the radial direction to provide a flange portion extending along the ridge line at the resulting respective ends, and press-forming the pre-processed part to deform inwardly in the cross-sectional direction at a position of one or more of the plural ridge lines to butt the ridge lines located at the innermost side and the flange portions to each other.

A bending method feeds a long workpiece material made of metal and having a plurality of thickness portions disposed at different angles between rollers and bends the workpiece material. An initial shape of the workpiece material is a straight line or a bend with a bend radius larger than a target bend radius, a thickness of a cross section of the workpiece material along a bend radius direction is set to increase from an inner side toward an outer side of the bend radius direction, the workpiece material is fed between the rollers and rolled in a way that an amount of rolling in a region corresponding to the outer side of the bend radius direction is larger than an amount of rolling in a region corresponding to the inner side, and the workpiece material is bent to have the target bend radius from the initial shape.

A machine tool and method for optimizing the performance of when manufacturing a workpiece requiring machining and bending operations, wherein the machine tool includes a machine frame with at least one linear movable tool carrier slide configured to carry a working unit, at least one work spindle provided to receive a workpiece and a working unit mounted onto the tool carrier slide. The working unit is configured to be rotated around a B-axis and the working unit is moved linearly in a plane perpendicular to the B-axis and wherein the working unit is configured to bend the workpiece received by the work spindle.

A machine tool and method for optimizing the performance of when manufacturing a workpiece requiring machining and bending operations, wherein the machine tool includes a machine frame with at least one linear movable tool carrier slide configured to carry a working unit, at least one work spindle provided to receive a workpiece and a working unit mounted onto the tool carrier slide. The working unit is configured to be rotated around a B-axis and the working unit is moved linearly in a plane perpendicular to the B-axis and wherein the working unit is configured to bend the workpiece received by the work spindle.

A method of forming a closed cross-sectional structure press-forming the plate-shaped workpiece into portions corresponding to bottom portion and left and right side wall portions; and providing bend-facilitating lines at the plurality of bend lines; bending the workpiece in a direction that the portions corresponding to the left and right side wall portions approach each other by pressing a punch into a space between a pair of dies while clamping the portion corresponding to the bottom portion between the punch and a pad in a plate thickness direction; and bending the corresponding portions along the bend-facilitating lines by pressing the corresponding portions against an outer periphery of a plug having an outer peripheral shape the same as a final shape of the closed cross-sectional structure while the plug is placed on the portion of the workpiece corresponding to the bottom portion.

A cooking appliance includes a housing including a door, a cooking chamber provided inside the housing, and a heater provided to heat the cooking chamber, wherein the housing includes a bending portion, which is bent to have a bending angle and has a bending groove cut using a tool and formed at an inside of the bending portion a first portion, which extends from one end of the bending portion and a second portion, which extends from the other end of the bending portion.