The difference between precision casting and stamping process

The difference between precision casting and stamping parts

Stamping is classified according to the process and can be divided into two categories: separation process and forming process. The separation process is also called blanking, and its purpose is to separate the stamping parts from the sheet along a certain contour line, while ensuring the quality requirements of the separation section.

Stamping is an efficient production method. The use of composite molds, especially multi-station progressive molds, can complete multiple stamping processes on one press, and realize the complete process from strip uncoiling, leveling, punching to forming and finishing. Automatic production. The production efficiency is high, the labor conditions are good, and the production cost is low. Generally, hundreds of pieces can be produced per minute. The purpose of the forming process is to plastically deform the sheet without breaking the blank to make a workpiece of the desired shape and size. In actual production, multiple processes are often integrated into a workpiece. Blanking, bending, shearing, deep drawing, bulging, spinning, and straightening are several major stamping jobs.

Castings are metal forming objects obtained by various casting methods, that is, the smelted liquid metal is injected into the pre-prepared casting mold by pouring, injection, suction or other casting methods, and after cooling, it is subjected to falling sand, cleaning and post-processing. Processing, etc., the resulting objects of certain shape, size and properties.

The difference between metal stamping parts and castings: It has the characteristics of thinness, uniformity, lightness and strength. Stamping can produce workpieces with ribs, ribs, undulations or flanging that are difficult to manufacture by other methods to improve their rigidity. Due to the use of precision molds, the accuracy of the workpiece can reach micron level, and the repeatability is high and the specifications are consistent, and holes, bosses, etc. can be punched out.

The hardness test of metal stamping parts adopts Rockwell hardness tester. Small, complex-shaped stampings can be used to test small planes that cannot be tested on ordinary benchtop Rockwell hardness testers.

The properties of the casting itself directly affect the quality of the processing, and the hardness value is an important indicator to determine the processing of the casting.

1. Brinell hardness: It is mainly used to measure the hardness of castings, forgings, non-ferrous metal parts, hot-rolled billets and annealed parts. The measurement range is ≯HB450.

2. Rockwell hardness: HRA is mainly used for high hardness test pieces, to measure the hardness of materials and surface hardness above HRC67, such as cemented carbide, nitrided steel, etc., the measurement range is HRA>70. HRC is mainly used for hardness measurement after quenching or tempering of steel parts (such as carbon steel, tool steel, alloy steel, etc.), the measurement range is HRC20~67.

3. Vickers hardness: used to measure the hardness of thin parts and steel plate parts, and can also be used to measure the hardness of surface hardened parts such as carburizing, cyanidation, and nitriding.