Defects In Sheet Metal Products

Fracture during forming will take place at the weakest or thinnest point in the part being formed.

Defects in sheet metal products.

Defects in the final product of mechanically worked metal may have originated from any one or a combination of the following the ingot used for mw may contain defects pores microcracks or inclusions which may remain as such or get aggravated during working operation. The defects picked up during these processes are i casting defects ii rolling defects iii forging defects and iv welding defects. The occurrence of defects in sheet metal forming and their prevention is a complex subject. Factors affecting formed part quality in industrial mass production of autobody panels single acting presses with either single or multipoint control mpc die cushion systems are.

The weight doesn t change. Rolling defects wavy edges. The internal structural defects are. During the rolling process a piece of metal will experience a different amount of reduction in certain areas of the piece.

P capital metal industries operates a sheet metal factory. Dynamic defects can be corrected by controlling process variables forming forces forming speeds and friction forces and incoming sheet coil properties. They are main category of rolling defects. Zipper cracks in center of strip.

This can cause an uneven roll with various amounts of pressure throughout the piece. Another common defect in sheet metal rolling involves the splitting of a workpiece. Excessive thinning thickening of the sheet during forming wrinkles splits and springback are the three most common defects encountered during sheet metal stamping. One is the improper handling another one is the elasticity of sheet metal forming materials.

There are four main metallurgical processes for the manufacture of finished steel products where the steel products can pick up defects. There are two reasons behind this defect. When sheet metal is rolled the width doesn t change but since the thickness is dramatically reduced the length must increase by a similar percentage. Internal structural rolling defects.

This is most likely to be where the sheet has been bent under tension round an angle as extra thinning will occur there. Finishing services such as cutting bending forming and polishing are available p. The main reasons for the cracking are over stretching or stress concentration. The reason behind it is that welding positions are misaligned.

Surface defects are provided from impurities and inclusion in the material surface roll marks dirt rust and other cause related to prior treatment and working of metal. It isn t practical to handle this when it s flat so it is coiled as it s produced.