The occurrence of defects in sheet metal forming and their prevention is a complex subject.
Defects in sheet metal products.
During the rolling process a piece of metal will experience a different amount of reduction in certain areas of the piece.
This means the length of your sheet metal can be over a mile long.
There are two reasons behind this defect.
This can cause an uneven roll with various amounts of pressure throughout the piece.
They are main category of rolling defects.
Internal structural rolling defects.
Fig 1 these defects are described below.
There are four main metallurgical processes for the manufacture of finished steel products where the steel products can pick up defects.
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.
Zipper cracks in center of strip.
Rolling defects wavy edges.
This is most likely to be where the sheet has been bent under tension round an angle as extra thinning will occur there.
Fracture during forming will take place at the weakest or thinnest point in the part being formed.
Dynamic defects can be corrected by controlling process variables forming forces forming speeds and friction forces and incoming sheet coil properties.
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 produces a large selection of unfinished sheet metal products including aluminum carbon steel stainless steel and galvanized metals.
Finishing services such as cutting bending forming and polishing are available p.
P capital metal industries operates a sheet metal factory.
One is the improper handling another one is the elasticity of sheet metal forming materials.
It isn t practical to handle this when it s flat so it is coiled as it s produced.
The internal structural defects are.
The main reasons for the cracking are over stretching or stress concentration.
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 reason behind it is that welding positions are misaligned.
Excessive thinning thickening of the sheet during forming wrinkles splits and springback are the three most common defects encountered during sheet metal stamping.
The defects picked up during these processes are i casting defects ii rolling defects iii forging defects and iv welding defects.
