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What is multi-pass Metal Spinning?

Metal spinning is a rotary forming process for the production of hollow, rotationally symmetrical parts in sheet metal. The starting blank is usually a flat disc but may also be a tube or a pressed pre-form. In a series of sweeps and employing a forming roller, the metal is progressively shaped onto a mandrel conforming to the internal form of the finished part whilst the work-piece is rotated.

What metals can be spun?

All ductile metals can be spun and tougher materials can often be spun by the application of heat.

Why spinning rather than pressing?

In general, spinning offers flexibility with low tooling costs and is widely used for low- to medium-volume production. Depending on the application, spinning can offer major benefits which makes it first choice, even for high-volume production. Production machines can be configured with a range of attachments to produce a finished part in one hit eliminating secondary operations. Each case needs to be examined on its own merits.

Economies of Metal Spinning

The cost effectiveness of metal spinning and shear forming is characterised on the one hand by the possibility of combining the two techniques and on the other by the range of secondary forming or machining operations which can be carried out in the same set up.

Compared to methods such as pressing and deep drawing, spinning and shear forming involve lower forces. This in turn means that the equipment can be cost effectively engineered in terms of rigidity and size, to give a cost effective solution.

What is shear forming?

In contrast to multi-pass spinning, shear forming produces the final component in a single pass.

Shear forming is a variant on spinning applied to the manufacture of conical or other shapes. Unlike multi-pass spinning, the wall thickness of the work piece is deliberately reduced in a single pass of the forming roller.

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