Defects In Sheet Metal Products

Internal structural rolling defects.

Defects in sheet metal products. There are four main metallurgical processes for the manufacture of finished steel products where the steel products can pick up defects. The defects picked up during these processes are i casting defects ii rolling defects iii forging defects and iv welding defects. 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. 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.

Excessive thinning thickening of the sheet during forming wrinkles splits and springback are the three most common defects encountered during sheet metal stamping. 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. Rolling defects wavy edges. P capital metal industries operates a sheet metal factory.

They are main category of rolling defects. There are two reasons behind this defect. It produces a large selection of unfinished sheet metal products including aluminum carbon steel stainless steel and galvanized metals. Fracture during forming will take place at the weakest or thinnest point in the part being formed.

The weight doesn t change. Fig 1 these defects are described below. The main reasons for the cracking are over stretching or stress concentration. It isn t practical to handle this when it s flat so it is coiled as it s produced.

Zipper cracks in center of strip. 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. During the rolling process a piece of metal will experience a different amount of reduction in certain areas of the piece. This can cause an uneven roll with various amounts of pressure throughout the piece.

One is the improper handling another one is the elasticity of sheet metal forming materials. This means the length of your sheet metal can be over a mile long. The reason behind it is that welding positions are misaligned. Finishing services such as cutting bending forming and polishing are available p.

Another common defect in sheet metal rolling involves the splitting of a workpiece. Dynamic defects can be corrected by controlling process variables forming forces forming speeds and friction forces and incoming sheet coil properties.