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Sheet Metal Spinning Operations

Sheet metal production technologies are very important around metal manufacturing technologies to produce a wide variety of parts and products. There are various kinds of sheet metal manufacturing technologies that are used today. Around them, sheet metal forming and sheet metal cutting technologies are the most common ones. 

In this article, you can find summary information about sheet metal spinning operations, which is a type of sheet metal forming technology.

What Is The Sheet Metal Spinning? 

Conventional spinning(Image Source: https://www.rocheindustry.com/metal-spinning/).

Axially symmetric and long sheet metal parts are produced with sheet metal spinning operations. With proper mandrels, the sheet metal workpiece is forced to take the shape of the mandrel gradually. This force is applied by roller tools which exert a point force to the workpiece while the workpiece is spinning. 

There are three types of sheet metal spinning operations. These types are; conventional spinning, shear spinning, and tube spinning. 

Conventional Spinning Operations

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You can remember from satisfactory Instagram videos of conventional spinning operations. Actually, we explained conventional spinning operations above. The force exertion can be done via an NC controller which provides better production quality. Also, manual spinning operations are applied. 

Axisymmetric mandrels are generally used. Starting sheet metal disk is placed at the edge of the mandrel with a clamp fixture, and the workpiece starts spinning via an electric motor. And, force is gradually applied to start from the edge of the mandrel, as you see in the illustration. 

The sheet metal thickness does not change in conventional spinning operations. Because of that, the finished part’s diameter is smaller than the workpiece. 

The most important advantage of the conventional spinning operation is the production of very large cone or cup-shaped parts in low quantity. Alternative sheet metal shaping processes over conventional spinning may be more expensive because of the costs of big dies. But, conventional spinning mandrels can be produced from low-cost materials such as wood or other easily shaped materials. 

Shear Spinning Operations

Shear spinning(Image Source: https://www.researchgate.net/figure/Schematic-illustration-of-the-shear-spinning-process-9_fig1_270469200).

The main difference between the shear spinning operations from conventional spinning operations is the thinning of the workpiece with the application of shear deformation. Other names are used such as spin forging, flow turning, or shear forming for shear spinning operations. In aerospace, large parts such as rocket noses are produced with shear spinning operations. 

Calculation of the final thickness of the shear spun part is very simple. You just need to multiply the starting thickness of the work part with the sin of the angle of the mandrel. 

Tube Spinning

Internal and external tube spinning(Image Source: IQS Directory).

Tube spinning is actually a shear spinning operation in which the starting part is a tube other than a disk. The starting tube is placed on a mandrel and the thickness of the tube is reduced with the roller tool over the mandrel. With this thickness decrement, the length of the tube increases. The same shearing principle is valid for tube spinning operations. Different profile-shaped tubes can be produced with the tube spinning operations. 

Conclusion

The basic explanation of the sheet metal spinning operations can be made like above. There are various kinds of satisfactory videos on YouTube that you can find by searching the sheet metal spinning operations.

Do not forget to leave your comments and questions below about the sheet metal spinning operations. 

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