Stamping parts are mainly classified according to technology, which can be divided into two categories: separation process and forming process. The separation process, also known as blanking, is intended to separate the stamped part from the sheet metal along a certain contour and at the same time ensure the quality of the separated section. Precision stamping parts are an efficient production method, the selection of composite die, especially multi-station progressive die, can complete multiple stamping processes on one press, complete from strip uncoiling, leveling, blanking to forming, finishing of fully automatic production. The production efficiency is high, the labor conditions are good, and the production cost is low, usually hundreds of pieces can be produced per minute. The intention of the forming process is to make the sheet metal plastically deform without breaking the blank to form a workpiece of the desired shape and scale. In practice, it is often a combination of processes that are applied to a workpiece. Punching, bending, shearing, drawing, expanding, spinning, and straightening are the primary stamping operations.

Castings are metal forming objects obtained by various forging methods, that is, the liquid metal that has been exercised is written into the pre-prepared casting mold by pouring, injection, suction or other casting methods, and after cooling, it is sanded, sorted and post-processed, etc., and the object with a certain shape, scale and performance is obtained.
 Metal stamping parts have the characteristics of thin, uniform, light and strong, stamping can be made with stiffeners, ribs, rugged or flanged workpieces that are difficult to produce by other methods, so as to improve their rigidity. Because of the selection of fine molds, the accuracy of the workpiece can reach the micron level, and the repeatability is high, the standard is common, and it can stamping out holes, bosses, etc.

The hardness testing of metal stamping parts adopts Rockwell hardness tester. Small, stamped parts with complex shapes can be used to test flat surfaces that are too small to be inspected on a common benchtop Rockwell hardness tester. Hardness testing of castings: The properties of the castings themselves directly affect the quality of processing, among which the hardness value is an important index to determine the processing of castings. 1. Brinell hardness: mainly used to determine the hardness of castings, forgings, non-ferrous metal parts, hot-rolled blanks and annealed parts, the measurement range is ≯HB450. 2. Rockwell hardness: HRA is mainly used for high hardness specimens, to determine the hardness of materials and surface hardness higher than HRC67, such as cemented carbide, nitriding steel, etc., and the measurement range is HRA>70. HRC is mainly used for the hardness determination of steel parts (such as carbon steel, tool steel, alloy steel, etc.) after quenching or tempering, and the measurement range is HRC20~67. 3. Vickers hardness: It is used to determine the hardness of thin parts and steel plate parts, and can also be used to determine the hardness of carburizing, cyanidation, nitriding and other surface hardening parts.