Metal shrapnel, also known as metal shrapnel, belongs to metal stamping parts, one of the categories of electronic hardware materials. The common precision metal shrapnel is an important metal accessory of electronic components, and usually plays the role of conduction, switching, clamping, resonance and so on. The materials used generally include 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 processing of stamping dies. Stamping is a pressure processing method that uses a mold installed on a press to apply pressure to the material at room temperature to cause separation or plastic deformation 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 spring and curved leaf spring. There are many shapes of curved leaf springs, including S type, C type, N shape, round shape, Z shape, spoon shape, spiral shape, scroll shape, etc. Metal shrapnel is 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, automotive instrument light touch In switches and other products, it is also widely used in machines and instruments, such as instruments in machinery, vehicle buffer shockproof devices and relay delay devices, which play the role of buffer shockproof devices and relay delay devices.