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