Stamping process is done in order to make light-weight jewellery. In this process a metal mold with two distinctive parts is used. A metal plate is inserted between the top and the bottom part of the mold. The plate is then cut into the required form using pressure. This is one of the best procedures for mass production. The equipment used in stamping are:
Mechanical presses: These presses have a mechanical flywheel that stores the energy, transfers it to the punch and to the work piece. Their sizes range from 20 tons up to 6000 tons. The strokes range from 5 to 500 mm (0.2 to 20 in) and speeds from 20 to 1500 strokes per minute. The mechanical presses are well perfect for high-speed blanking, shallow drawing and for making precision parts.
Hydraulic presses: These presses use hydraulics to deliver a controlled force. The weight can vary from 20 tons to 10,000 tons and the strokes can vary from 10 mm to 800 mm (0.4 to 32 in). This equipment is perfect for deep-drawing, compound die action as in blanking with forming or coining, low speed high tonnage blanking and force type of forming rather than displacement type of forming.