The formation of ears or scalloped edges around the top of a drawn shell, resulting from directional differences in the plastic-working properties of rolled metal with, across, and at angles to the direction of rolling.
Source: The OHIO State University
The offset portion of the driveshaft that governs the stroke or distance the crosshead moves on a mechanical or manual shear.
Source: The OHIO State University
A main press-drive gear with an eccentrics as an integral part. The unit rotates about a common shaft, with the eccentric transmitting the rotary motion of the gear into the vertical motion of the slide through a connection.
Source: The OHIO State University
A mechanical press in which an eccentric, instead of a crankshaft, is used to move the slide.
Source: The OHIO State University
The portion of a die impression that distributes metal during forging into areas where it is most needed in order to facilitate filling the cavities of subsequent impressions to be used in the forging sequence.
Source: The OHIO State University
(1) In sheet metal forming, reducing the flange radius by retracting the forming punch a small amount after the stroke but before release of the pressure. (2) In rolling, the working of metal in which the axis of the roll is parallel to the thickness dimension. Also called edge rolling. (3) The forging operation of working a bar between contoured dies while turning it 90' between blows to produce a varying rectangular cross section.
Source: The OHIO State University
The maximum limits of forming depth that can be achieved with a multiple-action press; sometimes called maximum draw or maximum depth of draw.
Source: The OHIO State University
The removal of a part from a die by an air blast or mechanical means.
Source: The OHIO State University
A mechanism for removing a part from a die. Also called kicker or knock-out.
Source: The OHIO State University
A rod used to push out a formed piece.
Source: The OHIO State University
A change in dimensions that is directly proportional to and in phase with an increase or decrease in applied force; deformation which is recoverable when the applied force is removed.
Source: The OHIO State University
A section of a part which has two equilibrium positions and can be manually switched between each position. Elastic instabilities are created when a highly deformed area is constrained on all sides by regions of less deformed areas. Elastic instabilities are also referred to as oil canning.
Source: The OHIO State University
The maximum stress a material can sustain without any permanent strain (deformation) remaining upon complete release of the stress.
Source: The OHIO State University
The property of a material by which the deformation caused by stress disappears upon removal of the stress. A perfectly elastic body completely recovers its original shape and dimensions after the release of stress.
Source: The OHIO State University
A process for forming metal by the direct application of an intense, transient magnetic field. The workplace is formed without mechanical contact by the passage of a pulse of electric cur-rent through a forming coil. Also known as magnetic pulse forming.
Source: The OHIO State University
Cast or welded projections in the shape of an ear on the outboard section of a die. They are used for handling the die with chains.
Source: The OHIO State University
The amount of permanent extension of the material before it fractures. Elongation takes place in the part during forming or drawing operations. See also elongation, percent.
Source: The OHIO State University
The extension of a uniform section of a specimen expressed as a percentage of the original gage length: Elongation, % = (Lx – Lo) / Lo x 100 where Lo is the original gage length and , Lx is the final gage length.
Source: The OHIO State University
A relatively shallow indentation or raised design with basically no change in metal thickness.
Source: The OHIO State University
A process for producing raised or sunken designs in sheet material by means of male and female dies, theoretically with no change in metal thickness. Examples are letters, ornamental pictures, and ribs for stiffening. Heavy embossing and coining are similar operations.
Source: The OHIO State University
A die used for producing embossed designs.
Source: The OHIO State University
A pin used in conjunction with pressure pins to distribute and balance the load on a die cushion. Also called balancing pins.
Source: The OHIO State University
A cupping test used to assess the ductility of sheet metal. The method consists of forcing a conical or hemispherical-ended plunger into the specimen and measuring the depth of the impression at fracture.
Source: The OHIO State University
The shaping of metal parts in which the forming pressure is generated by an explosive charge.
Source: The OHIO State University
A mechanism attached to a press for removing a part from a die. Also called an iron hand.
Source: The OHIO State University
(1) The turning up or drawing out of a flange around a hole which has been punched in a previous operation. Also called hole flanging. (2) The punching and flanging of a hole in one operation generating a slug. (3) The cutting or tearing (piercing) and flanging of a hole in one operation without generating a slug. Also called spearing or spear punching.
Source: The OHIO State University
A metal forming process. A punch compresses a billet (hot or cold) confined in a container, so that the billet material flows through a die in the same direction as the punch.
Source: The OHIO State University
A bolt having a looped head designed to receive a hook or rope.
Source: The OHIO State University
The displacing of material about an opening in sheet or plate so that a lip protruding above the surface is formed.
Source: The OHIO State University
