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

2019-05-31 14:31:17

Oiling inspection of metal stamping parts:

Clean the surface of the outer covering with clean gauze. Then use a clean brush to uniformly apply oil in the same direction to the entire outer surface of the stamping part.

The metal stamping parts coated with oil should be inspected under strong light. It is suggested that the stamping parts should be erected on the body position. In the stamping process of metal stamping parts, because the surface of the material is not destroyed, it has better surface quality, smooth and beautiful appearance, which provides convenient conditions for surface painting, electroplating, phosphating and other surface treatment. With this method, it is easy to find tiny pits, holes and ripples on metal stamping parts.

Touch Inspection of Hardware Stamping Parts:

Clean the surface of the outer covering with clean gauze. Inspectors need to wear touch gloves to touch along the stamping parts vertically close to the surface of metal stamping parts. This inspection method depends on the experience of inspectors. The curved edge is too short to form easily, so the straight part of the curved edge should be H > 2delta. If H is required to be very short, a suitable margin should be set aside to increase H, bend well and then cut off the added metal. If necessary, the suspicious area can be polished and verified by oil stone, but this method is an effective and rapid inspection method.

Visual inspection of metal stamping parts:

Visual inspection is mainly used to detect abnormal appearance and macro defects of stamping parts.

Differences between castings and metal automotive stampings:

Stamping with thin, uniform, light and strong features can produce workpieces with stiffeners, ribs, undulations or flanges which are difficult to produce by other methods to improve their rigidity. Because of the choice of fine die, the precision of workpiece can reach micron level, and high repetition accuracy, common standards, can punch holes, protrusions and so on.

Cold stamping parts are usually no longer machined, or require only a small number of cutting processes. The precision and appearance of hot stamping parts are lower than those of cold stamping parts, but still better than castings and forgings, and the cutting quantity is less.

Stamping is mainly classified according to technology, which can be divided into two categories: separate process and forming process. Separation process, also known as blanking, is intended to separate stamping parts from sheet metal along a certain contour line, while ensuring the quality requirements of the separation section.