Sheet Cutting Machine

    Equipment/facility: Equipment

    • LocationShow on map

      Machine Shop, Building 1A, Undercroft. Opposite to Material Testing Lab.

    Equipments Details

    Description

    Sheet cutting also known as Shearing or die cutting, is a process which cuts stock without the formation of chips In strict technical terms, the process of "shearing" involves the use of straight cutting of sheet metal or plates. However rods can also be sheared. Shearing-type operations include: blanking, piercing, roll slitting, and trimming. A punch (or moving blade) is used to push a work piece against the die (or fixed blade), which is fixed. Usually the clearance between the two is 5 to 40% of the thickness of the material, but dependent on the material. Clearance is defined as the separation between the blades, measured at the point where the cutting action takes place and perpendicular to the direction of blade movement. It affects the finish of the cut (burr) and the machine's power consumption. This causes the material to experience highly localized shear stresses between the punch and die. The material will then fail when the punch has moved 15 to 60% the thickness of the material, because the shear stresses are greater than the shear strength of the material and the remainder of the material is torn. Two distinct sections can be seen on a sheared workpiece, the first part being plastic deformation and the second being fractured. Because of normal in homogeneities in materials and inconsistencies in clearance between the punch and die, the shearing action does not occur in a uniform manner. The fracture will begin at the weakest point and progress to the next weakest point until the entire work piece has been sheared; this is what causes the rough edge. The rough edge can be reduced if the work piece is clamped from the top with a die cushion. Above a certain pressure the fracture zone can be completely eliminated.[2] However, the sheared edge of the work piece will usually experience work hardening and cracking. If the work piece has too much clearance, then it may experience roll-over or heavy burring.

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