Stamping can be divided into two categories: separation process and forming process. Separation process, also known as blanking, aims to separate stamping parts from sheet metal along a certain contour line, while ensuring the quality requirements of the separation section.

Stamping is an efficient production method. By using compound dies, especially multi-position progressive dies, the multi-pass stamping process can be completed on a press, and the full automatic production from strip uncoiling, leveling, blanking to forming and finishing can be realized. High production efficiency, good working conditions, low production cost, can generally produce hundreds of pieces per minute. The purpose of forming process is to make the sheet metal plastic deformation without breaking the blank, and to make the required shape and size of the workpiece. In actual production, many processes are often applied to a workpiece. Punching, bending, shearing, drawing, bulging, spinning and straightening are the main stamping jobs.

Casting is a metal forming object obtained by various casting methods, that is, the melted liquid metal is injected into the pre-prepared casting mold by pouring, injection, inhalation or other casting methods. After cooling, the object with certain shape, size and performance is obtained through sand drop, cleaning and post-treatment.

The difference between metal stamping parts and castings: stamping parts with thin, uniform, light and strong features can produce workpieces with stiffeners, ribs, undulations or flanges which are difficult to manufacture by other methods to improve their rigidity. Due to the use of precision die, the accuracy of the workpiece can reach micron level, and the repetition accuracy is high, the specifications are consistent, and holes and convex tables can be punched out.

Rockwell hardness tester is used for hardness testing of metal stamping parts. Small stamping parts with complex shapes can be used to test the plane is very small and can not be tested on ordinary desktop Rockwell hardness tester.

The properties of castings directly affect the quality of processing, and the hardness value is an important index to determine the processing of castings.

1. Brinell hardness: It is mainly used to measure the hardness of castings, forgings, non-ferrous metal parts, hot-rolled billets and annealed parts, and to determine the range of HB450.
2. Rockwell hardness: HRA is mainly used for high hardness specimens. The material and surface hardness, such as cemented carbide and nitrided steel, whose hardness is higher than HRC67, are measured in the range of HRA > 70. HRC is mainly used to determine the hardness of steel parts (such as carbon steel, tool steel, alloy steel, etc.) after quenching or tempering. The measuring range is HRC20 ~ 67.
3. Vickers hardness: used to determine the hardness of thin and steel parts, but also used to determine the hardness of carburized, cyanide, nitriding and other surface hardened parts.