Stamping according to the process classification, can be divided into two categories of separation process and forming process. The separation process, also known as blanking, aims to separate the stamping parts from the sheet metal along a certain contour line and ensure the quality requirements of the separated section.

Stamping is an efficient production method, the use of composite die, especially the multi-station progressive die, can be completed in a pressure machine multiple stamping process, to achieve the full automatic production from the material uncoiling, leveling, blanking to forming, finishing. High production efficiency, good labor conditions, low production costs, generally hundreds of pieces per minute. The purpose of forming process is to produce the workpiece of required shape and size by plastic deformation of sheet material without breaking the blank. In actual production, it is often a variety of processes applied to a workpiece. Blanking, bending, shearing, drawing, bulging, spinning and straightening are the main kinds of stamping work.

Castings are metal molding objects obtained by various casting methods, that is, molten liquid metals are injected into prepared casting molds by pouring, injection, suction or other casting methods, and then cooled and sanded, cleaned and post-treated to obtain objects with certain shapes, sizes and properties.

Difference between metal stamping parts and castings: with the characteristics of thin, uniform, light and strong, stamping can produce workpieces with stiffeners, ribs, undulations or flanges that are difficult to be produced by other methods to improve their rigidity. Due to the use of precision mold, workpiece precision up to micron level, and repeat high precision, consistent specifications, can be punched out of holes, boss.

Rockwell hardness tester is used to test the hardness of hardware stamping parts. Small stamping parts with complex shapes that can be used to test surfaces that are too small to be tested on a conventional benchtop rockwell hardness tester.
The properties of castings directly affect the quality of machining, and the hardness is an important index to determine the machining of castings.
Brinell hardness: mainly used for determination of casting, forging, non-ferrous metal parts, the hardness of hot rolled billet and annealing, measurement range ≯ HB450.
2. Rockwell hardness: HRA is mainly used for high-hardness test pieces. The hardness of materials and surface hardness higher than HRC67, such as cemented carbide and nitride steel, is determined within the range of HRA>70. HRC is mainly used for hardness determination of steel parts (such as carbon steel, tool steel, alloy steel, etc.) after quenching or tempering. The determination range is HRC20~67.
3. Vickers hardness: used to determine the hardness of thin parts and steel plate parts, but also can be used to determine the hardness of carburizing, cyaniding, nitriding and other surface hardening parts.