Both machining and metalworking operation change that size and shape of a material. Whereas machining mostly use cutting processes, metalworking relies on heat and pressure. There are various types of metalworking operations. One of them is explosive forming.
In explosive forming, small controlled explosions create shock and pressure that are used to shape metals. The explosive which is usually a mixture of gas is detonated over the metal that is placed on top of a die. The forces from the explosion forces the metal into the die and spread it evenly over the die's surface. The same forces can cause plastic deformation which can strengthen the metal.
There are two main methods used for explosive forming. The first one is the standoff method wherein the explosive is placed from a prearranged distance from a metal work piece. The energy from the explosion is transmitted to the metal either through air, water or oil. The second explosive forming operation is the contact method wherein the explosive and the work piece are in direct contact with each other. The explosion produces a very high amount of pressure, forcing the metal into the die.
Explosive forming was first used in aerospace applications in the 1960s and has been in use ever since. This metalworking operation offered several advantages. It maintains precise tolerance and eliminates the need for time-consuming and often costly welds. The quality of the finished work piece is dependent upon the die. A high quality die is always going to product high quality results.
Unlike other metal working methods, explosive forming requires less tooling which an greatly affect the cost of an operation.
