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Where t is the sheet metal thickness, L is the total length sheared (perimeter of the shape), and UTS is the ultimate tensile strength of the material. Die and punch shapes affect the force during the punching process. The punch force increases during the process as the entire thickness of the material is sheared at once.
This bending method forms material by pressing a punch (also called the upper or top die) into the material, forcing it into a bottom V-die, which is mounted on the press. The punch forms the bend so that the distance between the punch and the side wall of the V is greater than the material thickness (T). Either a V-shaped or square opening may ...
A typical compound fine blanking press includes a hardened die punch (male), the hardened blanking die (female), and a guide plate of similar shape/size to the blanking die. The guide plate is the first applied to the material, impinging the material with a sharp protrusion or stinger around the perimeter of the die opening. Next, a counter ...
Punch – male portion of the die which punches through the sheet metal and into the corresponding (female) section of the die block. More specifically: [ 1 ] Blanking punch – performs a dual-purpose operation where either a profiled slug, called the blank, is cut out and used for further working, or where a finished piece is cut free from ...
The outer area of metal remaining after a blanking operation is generally discarded as waste. Size of blank or product is the size of the die & clearance is given on punch. It is a metal cutting operation. In blanking, metal obtained after cutting is not a scrap if it is usable. The size of the blank depends on the size of the die.
Offset dies—a combination punch and die set that bends two angles in one stroke to produce a Z shape. Hemming dies—two-stage dies combining an acute angle die with a flattening tool. Seaming dies—There are a number of ways to build dies to produce seams in sheets and tubes. Radius dies—A radiussed bend can be produced by a rounded punch.
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Deep drawing is a sheet metal forming process in which a sheet metal blank is radially drawn into a forming die by the mechanical action of a punch. [1] It is thus a shape transformation process with material retention. The process is considered "deep" drawing when the depth of the drawn part exceeds its diameter.