Metal spinning or otherwise known as spinning, spin forming or metal turning is a process of metalworking by which a tube or disc of metal is being rotated at high speed and form into axially symmetric part. The spinning could be done by either CNC lathe or by hand. Metal spinning normally consists of the removal of material like in traditional metal or wood turning. As for the molding or forming of sheet material, it’s done over existing shape.
In reality, metal spinning range from the expertise and experience of the artisan up to the most complicated and beneficial way to form round metal parts for commercial purposes. Artisans are using this process in order to produce architectural detail, decorative household goods as well as urns and even specialty lighting. Read more here!
For commercial applications of metal spinning process, it’s plentiful actually similar to production of cookware, gas cylinders, rocket nose cones, brass instruments, public waste receptacles and so forth. Fact is, any ductile metal can be formed from stainless steel, aluminum to high strength and high temperature alloy. As for the diameter and depth of the formed parts, these are limited by the equipment’s size. Read more info!
The process of spinning is quite simple; in drive section of lathe, a formed block will be mounted and then, pre-sized metal disk is clamped against the block using pressure pad, which is attached to tailstock. The workpiece and the block are rotated together at super fast speeds. Localized force is applied to workpiece to make it flow to the block. Normally, the force applied is through the use of different levered tools. Simple workpieces are being removed from block however, several blocks may be required for more complex and sophisticated shapes.
When working with extremely complicated shapes, it is spun on ice forms that melts after spinning. Since the final diameter of workpiece is less than its starting diameter, the workpiece has to be elongated radially, thickened or buckled circumferentially.
For more involved process that is referred to as necking or reducing, it lets the spun workpiece to integrate reentrant geometries. If for instance that the surface form and finish are not critical, the workpiece is spun on air and no mandrel needs to be used. If the form or finish is hard however, it will demand eccentrically mounted mandrel.
There are metal spinning tools that are allowed on the bearings throughout the forming process. These tools help in reducing heating and friction of the tool, extending its life while improving the surface finish. To be able to extend the life of the tool, the rotating tools are coated using thin film of ceramic. For more facts about welding, visit this website at https://en.wikipedia.org/wiki/Welding.