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What is the difference between casting and stamping?

Edit:Xiangyang Liqiang Machinery Co., Ltd.UpDate:2019-08-05
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Stamping according to the process classification, can be divided into two major categories of separation process and forming process. The separation process is also referred to as blanking, and its purpose is to separate the stamped parts from the sheet along a certain contour line while ensuring the quality requirements of the separated sections.

Stamping is an efficient production method, using composite molds, especially multi-station progressive molds, on a press Complete multi-pass stamping process to realize fully automatic production from unwinding, leveling and punching of strips to forming and finishing. High production efficiency, good working conditions, low production costs, and generally can produce hundreds of pieces per minute. The purpose of the forming process is to plastically deform the sheet without breaking the blank to produce a workpiece of the desired shape and size. In actual production, it is often the case that multiple processes are integrated into one workpiece. Blanking, bending, shearing, drawing, bulging, spinning, and correction are several major stamping jobs.

Castings are metal-formed objects obtained by various casting methods, that is, pouring and injecting molten metal Inhalation or other casting method is injected into the pre-prepared mold, and after cooling, the object having a certain shape, size and performance is obtained by falling sand, cleaning and post-treatment.

The difference between metal stampings and castings: thin, uniform, light, strong, stamping can make other methods difficult to manufacture A workpiece with ribs, ribs, undulations or flanging to increase its rigidity. Thanks to the use of precision molds, the precision of the workpiece can reach micron level, and the repeatability is high and the specifications are the same. It is possible to punch out the holes and the bosses.

The hardness of metal stamping parts is measured by 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, where the hardness value is an important indicator for casting processing.

1. Brinell hardness: mainly used for the determination of castings, forgings, non-ferrous metal parts, hot-rolled billets and annealed parts Hardness, measurement range ≯ HB450.

2. Rockwell hardness: HRA is mainly used for high hardness test pieces, and the hardness and surface hardness of HRC67 or higher are measured. For example, cemented carbide, nitrided steel, etc., measurement range HRA > 70. HRC is mainly used for the hardness measurement 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: used to determine the hardness of thin and steel parts, can also be used to determine carburizing, cyanide Hardness of surface hardened parts such as nitriding, nitriding, etc.

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