There are many types of shears used to shear sheet metal. Shearing, also known as die cutting, is a process which cuts stock without the formation of chips or the use of burning or melting. Strictly speaking, if the cutting blades are straight the process is called shearing; if the cutting blades are curved then they are shearing-type operations. The most commonly sheared materials for shear machine are in the form of sheet metal or plates, however rods can also be sheared. Shearing-type operations include: blanking, piercing, roll slitting, and trimming. It is used in metalworking and also with paper and plastics. Following I will introduce 6 different types of shear.
Alligator Shear: It is a metal-cutting shear with a hinged jaw, powered by a flywheel or hydraulic cylinder. Alligator shears are generally set up as stand-alone shears, however there are types for excavators.
Bench Shear: It is usually used for cutting rough shapes out of medium sized pieces of sheet metal, but cannot do delicate work. For the small shear, it mostly designed for a wide field of applications. Light weight and easy efficient operation, yet very sturdy in construction.
Power shears: A power shear is electrically or pneumatically powered hand tool designed to blank large pieces of sheet metal. They are designed to cut straight lines and relatively large radius curves. They are advantageous over a bandsaw because there is not a size limit.
Throatless shear: It is a cutting tool used to make complex straight and curved cuts in sheet metal.
Tin snips: Snips are hand tools used to cut sheet metal and other tough webs. Tin snips are one of the most popular type of snips. Depending on the size of the blade, tin snips can cut between 23 and 16 gauge cold rolled low-carbon steel.