Metal shrapnel is an important metal component, which usually plays the role of conduction, switch, clamping, resonance and so on. The materials used are generally beryllium copper (requires heat treatment), titanium copper, phosphor bronze, brass, stainless steel, spring steel, etc. The production of metal shrapnel is a special process of processing materials (metal or non-metal) into parts (or semi-finished products) through cold stamping of stamping dies. Stamping is a pressure processing method that uses a die installed on a press to apply pressure to a material at room temperature to separate or plastically deform it to obtain the required parts. There are many types of metal shrapnel. The shrapnel has various shapes and structures due to different uses. It can be divided into two types: straight leaf springs and curved leaf springs. Shape, Z shape, spoon shape, spiral shape, scroll shape, etc. Hardware shrapnel are mainly used in mobile phone cards, mobile phone antennas, membrane switches, contact switches, PCB boards, FPC boards, medical equipment, earphone audio jacks, connectors, micro motors, sensors, relay switches, digital 3C, car instrument touch In switches and other products, it is also used in instruments that are widely used in machines and instruments, such as buffer shock-proof devices and relay delay devices of machinery and vehicles, and play the role of buffer shock-proof devices and relay delay devices.