Metal Spinning Methods

Metal Spinning - a technology with a tradition

Leifeld has taken a traditional craft and applied to it the latest technological advances.

A disc blank or pre-form is clamped against a chuck by the machine tailstock and rotated by the drive motor. The spinforming roller, on a two-axis compound slide, is programmed to make a series of sweeping motions to progressively form the metal onto the chuck. Auxiliary slides and/ or tool changers are used to carry out finishing operations such as profiling, machining, edge trimming, curling, beading and flanging.

Shear Forming - one pass forming

In this variant, metal is volumetrically displaced in an axial plane. In a single pass, conical, concave and convex hollow parts are produced whereby the diameter of the open end of the cone corresponds to the initial diameter of the disc blank.

shear forming on a Leifeld spinning machine

Deliberate wall thinning takes place as a direct function of the angle of the cone. Cycle times are extremely short.

Reducing (Necking In) - Spinning "on air"

Re-entrant shapes where both form and finish are secondary may be produced by spinforming "on air", i.e. with no internal support. In this case, the pre-form is externally clamped in a retaining chuck.

necking in on a Leifeld metal spinning machine

Where a higher quality is demanded, internal segmented tooling or, if the geometry allows, an eccentrically mounted, internal roller may be employed.

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Leifeld metal spinning machines technology