What is the difference between automotive hardware stamping parts and castings?

2022-04-19 16:46:03

The main material of metal stamping dies is die steel (including tool steel and high-speed steel), and sometimes hard alloy is used. Metal stamping dies are usually required to have high hardness and wear resistance, and heat treatment is essential. Rockwell hardness tester is mainly used to test the hardness of various cold rolled steel plates used for metal stamping processing.

HRB scale is usually used, and HRC scale is used for the harder one. Wechsler hardness tester, surface Rockwell hardness tester hrn or HRT scale can be used for thin plate materials. Rockwell hardness tester is mainly used for hardness testing of metal stamping die steel to test HRC hardness value. When the die is large and inconvenient to move, Richter hardness tester can be used.

The hardness test of cemented carbide adopts Rockwell hardness HRA scale. The hardness of brass plate used for metal stamping parts can be tested with HRB scale of Rockwell hardness tester. The softer brass plate and copper plate adopt HRF scale, and the thinner plate adopts HRT scale. The aluminum alloy plate used for metal stamping parts can be tested with Wechsler hardness tester. When the material thickness is greater than 13mm, it can be replaced with Babbitt hardness tester, Pure aluminum plate or low hardness aluminum alloy plate shall adopt Babbitt hardness tester.

The extremely thin plates of various metals processed by hardware automobile stamping parts can use the hr30t scale of surface Rockwell hardness tester and diamond point anvil. In this way, the hardness value of hr30tm can be tested, and the thickness of the tested thin plate can be less than 0.05mm. Hardware stamping parts can also use the hr15t and hr45t scales of surface Rockwell hardness, which can be converted into hr30tm hardness value after testing.

The difference between metal stamping parts and castings: it has the characteristics of thin, uniform, light and strong. Metal stamping can produce workpieces with stiffeners, ribs, undulations or flanging that are difficult to be manufactured by other methods, so as to improve their rigidity. Because metal stamping adopts precision die, the accuracy of workpieces can reach micron level, with high repetition accuracy and consistent specifications, it can punch holes, sockets, bosses, etc.

Metal stamping is mainly classified according to the process, which can be divided into two categories: separation process and forming process. The separation process is also known as blanking. Its purpose is to separate the metal stamping parts from the sheet along a certain contour line and ensure the quality requirements of the separation section.

Metal stamping is an efficient production method. Using compound die, especially multi station progressive die, multiple stamping processes can be completed on one press to realize full-automatic production from strip uncoiling, leveling, blanking to forming and finishing. In actual production, a variety of processes are often applied to a workpiece.

High production efficiency, good labor conditions and low production cost. Generally, hundreds of pieces can be produced per minute. The purpose of the forming process is to make the sheet metal plastic deformation without breaking the blank. The metal stamping can be made into the workpiece with the required shape and size. Blanking, bending, shearing, deep drawing, bulging, spinning and correction are several main metal stamping processes.