A method for producing a clamping ring in which pins that protrude in the region of or near a ring contour are formed on the top and bottom surfaces of a flat sheet metal material and after the ring contour is cut out, burrs that are produced during the cutting are removed by a deburring process. Advantages for the machining of the clamping ring are achieved if before a finish cutting by a complete cutting-out of the ring contour that is carried out from the one side of the flat sheet metal material, the ring contour is partially cut out from the other side in the vicinity of or near the pin protruding from this other side.

Fine blanking system comprising one or more movable parts, further comprising at least one first drive of a first drive type and at least one second drive of a second drive type different from the first drive type for driving at least one of the movable parts, wherein the first drive and the second drive are arranged to drive the same movable part.

A method for operating a fine blanking system comprises at least one fine blanking press having a first press unit, a second press unit, and one or more sensors. The method comprises obtaining parameter data from the one or more sensors for at least one of the first press unit, the second press unit, and another component of the fine blanking system during a first fine blanking process step. Adjustments are determined for control parameters of at least one of the first press unit, the second press unit, and the other component based on the parameter data. The adjustments are applied to the control parameters in a second fine blanking process step subsequent to the first fine blanking process step.

A stamping apparatus includes a die, a punch, a back-pressure device, a lift-up mechanism, and a delay device. A workpiece is mounted on the die. The punch is arranged to approach and recede from the die and configured to punch out a product from the workpiece. The back-pressure device includes a pushing member disposed in the die and urges the pushing member toward the punch to apply back pressure to the workpiece. The lift-up mechanism is configured to lift the workpiece above the die when the punch recedes from the die. The delay device is configured to delay lifting movement of the pushing member in relation to receding movement of the punch when the punch recedes from the die.

A stamping method includes: punching out a product from a workpiece by using a die on which the conveyed workpiece is placed, a punch, and a back pressure portion; displacing the workpiece upward with respect to the die when the punch moves away from the die; before the product is punched out, providing a protrusion that protrudes downward and is located at a part of the workpiece, the part being on the upstream side in a workpiece conveying direction of a punch-out portion and aligned with the punch-out portion; and using the protrusion, which is displaced downstream in the conveying direction together with the workpiece, to push the product downstream in the conveying direction, so that the product is ejected to the outside.

A punching device for punching a workpiece includes a punching part and a broaching part. The punching part has a punching cutting edge that limits a punching cutting area, the punching part being intended to pierce the workpiece. The broaching part is intended to tear the workpiece later than the punching part, and includes at least a broaching tooth with a cutting edge that limits a cutting area which is greater than the punching cutting area.

A sheet-shaped blank (10) for press forming is produced by shearing a metal sheet (30). The blank (10) includes a sheared edge (14), which includes a sheared surface (14b) and a fractured surface (14c) in the sheet thickness direction and has a loop shape in plan view. In plan view, an edge of the sheared edge (14) includes concavely curved portions (20). The average of lengths of the fractured surface (14c) in the sheet thickness direction in the curved portions (20) is greater than the average of lengths of the fractured surface (14c) in the sheet thickness direction over the entire perimeter of the sheared edge (14).

A sheet-shaped blank (10) for press forming is produced by shearing a metal sheet (30). The blank (10) includes a sheared edge (14), which includes a sheared surface (14b) and a fractured surface (14c) in the sheet thickness direction and has a loop shape in plan view. In plan view, an edge of the sheared edge (14) includes concavely curved portions (20). The average of lengths of the fractured surface (14c) in the sheet thickness direction in the curved portions (20) is greater than the average of lengths of the fractured surface (14c) in the sheet thickness direction over the entire perimeter of the sheared edge (14).

A power adapter, a mobile terminal, a power interface (100) and a method thereof are provided. The method may includes: S10: providing a pin workblank (200), wherein the pin workblank includes a first surface (201) and a second surface (202); S20: performing a fine blanking process for the first surface (201) in a predetermined blanking direction, while burrs forming on the second surface (202); S30: adjusting a position of the pin workblank (200), performing another fine blanking process for the second surface (202) in the predetermined blanking direction, thereby forming a power pin (120) of the power interface (100).

A power adapter, a mobile terminal, a power interface (100) and a method thereof are provided. The method may includes: S10: providing a pin workblank (200), wherein the pin workblank includes a first surface (201) and a second surface (202); S20: performing a fine blanking process for the first surface (201) in a predetermined blanking direction, while burrs forming on the second surface (202); S30: adjusting a position of the pin workblank (200), performing another fine blanking process for the second surface (202) in the predetermined blanking direction, thereby forming a power pin (120) of the power interface (100).