What is the difference between automobile castings and metal stamping parts?

2023-01-31 09:04:33

Oiling inspection of metal stamping parts:

Wipe the surface of the outer cover with clean gauze. Then use a clean brush to evenly oil the entire outer surface of the stamping parts in the same direction.

Put the oiled metal stamping parts under strong light for inspection. It is recommended to put the stamping parts on the vehicle body. During the stamping process, metal stamping parts have good surface quality and smooth and beautiful appearance because the surface of the material is not damaged, which provides convenient conditions for surface painting, electroplating, phosphating and other surface treatment. With this method, it is easy to find tiny pits, pits and ripples on the metal stamping parts.

Touch inspection of metal stamping parts:

Wipe the surface of the outer cover with clean gauze. The inspector needs to wear touch gloves to touch the surface of the metal stamping parts along the longitudinal direction of the stamping parts. This inspection method depends on the inspector's experience. The curved edge is too short to form, so the straight part of the curved edge should be H>2 δ。 If H is required to be very short, it is necessary to set aside appropriate margin to increase H, and then cut off the added metal after bending. If necessary, polish the detected suspicious area with an oilstone and verify it, but this method is an effective and rapid inspection method.

Visual inspection of metal stamping parts:

Visual inspection is mainly used to find the appearance abnormalities and macroscopic defects of stamping parts.

Differences between castings and metal automotive stamping parts:

With the characteristics of thin, uniform, light and strong stamping, workpieces with stiffeners, ribs, undulations or flanging that are difficult to be made by other methods can be made to improve their rigidity. Because of the selection of fine molds, the precision of the workpiece can reach the micron level, and the repetition precision is high, the standard is common, and the hole nest and boss can be punched.

Cold stamping parts are usually no longer machined, or only require a few machining. The precision and appearance state of hot stamping parts are lower than those of cold stamping parts, but still better than castings and forgings, with less machining.

Stamping is mainly classified according to technology, which can be divided into two categories: separation process and forming process. The parting 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 parting section.