Abstract:
A method and apparatus are disclosed which are suitable for use in the manufacture of two-piece metal containers. In particular, a way of making cups from metal sheet is disclosed using a combination of stretching and drawing operations. The resulting cups have the advantage of having a base thickness that is thinner relative to the ingoing gauge of the metal sheet.
Abstract:
A method of shot peening according to the present invention includes: placing a jig having an appropriate dimension at one face side of a stamped workpiece; and performing shot peening on another face side of the workpiece in a state where the jig is placed at the one face side of the workpiece, and conforming the workpiece to the jig. At this time, the shot peening may be performed in such a way that residual stresses in the inner side and the outer side of the curved part of the workpiece will become compressive stresses.
Abstract:
A drawing support for a metal sheet drawing machine. In one implementation the drawing support is constructed of a plurality of plates positioned in series one after the other and coupled together so that at least a portion of the plurality of plates are compressed one against the other. In one implementation each of the plurality of plates has a window through which metal sheet to be drawn may pass, and a holder for holding the metal sheet when it is drawn.
Abstract:
A draw press device may include a lower mold having a lower surface forming portion, a blank holder disposed outside the lower mold, an upper mold having an upper surface forming portion disposed at an upper side slider above an upper side of the lower mold, and a stretching forming portion that performs a stretching when both end portions of the material panel are grasped by a cam operation before shaping or pressing the material panel.
Abstract:
In a method of making a sheet metal part for motor vehicles, a blank is placed with its opposite length sides between outer lower forming jaws of a die. The blank is then clamped by moving the outer lower forming jaws toward one another. Outer upper forming jaws are then moved to their closed position so that the length sides of the blank are secured in place between the lower and upper forming jaws. The lower and upper forming jaws and a press tool are then moved toward one another, and the blank is shaped to its final configuration to produce a sheet metal part.
Abstract:
A stretch-forming press for stamping continuously fed sheet metal includes a ram, a base member, and a feed mechanism configured to advance a strip of sheet metal through the stretch-forming press. A forming station has a die configured to form a desired pattern in the strip of sheet metal. A leveling station has a pair of opposed jaws slidably received in corresponding recesses of the stretch-forming press, with the jaws oriented at an angle with respect to a direction of travel for the strip of sheet metal as it passes through the leveling station.
Abstract:
Process for improving planeness of a metal sheet, in which the sheet is stretched between two jaws for a period of time, applying a controlled permanent elongation of greater than 0.5%. Transverse pressure is applied on at least one face of the sheet during at least part of the period time during which stretching is applied with at least one longitudinally movable roll, or with a metal bar clamped to an opposite face of the sheet.
Abstract:
A stretch-forming machine of the type wherein a pair of opposed curving jaws grips opposing ends of a metal sheet to be stretch-formed in a curved configuration. Each of the jaws are formed of an array of adjacent grippers movable relative to each other by respective hydraulic cylinders to define a part of the curve of the jaw. The improvement to the stretch-forming machine which is the subject of this application comprises a closed-loop servo-control means for moving each one of the grippers into a predetermined position relative to each other. Each of the servo-control means comprises a hydraulic cylinder position controller carried by the hydraulic cylinder of the one gripper for controlling hydraulic fluid flow to the hydraulic cylinder responsive to stored data representing the desired predetermined position of one of the grippers. A motor is provided for actuating the position controller in response to the data received by the position controller to move the hydraulic cylinder. Hydraulic cylinder position feedback means is positioned on the hydraulic cylinder for sensing the position of the hydraulic cylinder and communicating a signal representing the position of the hydraulic cylinder to the position controller.