KEVOS® MAKEOS · Fabrication
Shear Spinning Blank Thickness and Force
How thick must the blank be for this shear-spun cone, and what force and power does the roller need?
Shear (cone) spinning by the sine law: starting blank thickness for a required wall thickness and cone half-angle, the ideal tangential roller force from the material’s average flow stress, thickness reduction and feed, and the power at the roller.
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How this tool works
Inputs, units and where to find them
| Input | Unit | Typical source |
|---|---|---|
| Wall thickness of the spun part | mm | Required wall thickness of the cone. |
| Half angle of the cone | ° | Half angle of the cone (between the wall and the axis). |
| Average flow stress of the material | MPa | Average flow stress over the strain range (from a true stress–strain calculation). |
| Roller feed per revolution | mm/rev | Axial feed of the roller per revolution. |
| Diameter at the roller | mm | Work diameter at the roller contact. |
| Spindle speed | rpm | Spindle speed. |
Method and formulas
- Sine law: T = T_w ÷ sin α (the flange keeps its blank diameter, the wall thins).
- Ideal tangential force F_t = σ_f (T − T_w) f.
- Power = F_t × surface speed at the roller.
- Example: a 2 mm wall at 30° half angle needs a 4 mm blank.
Limitations
- Ideal force; friction and redundant work add to it.
- Very small half angles exceed the material’s spinnability limit; confirm with trials.
- Example values are illustrations. Replace them with values for your actual task.
Typical uses
- Choose blank thickness for a spun cone
- Estimate roller force and machine power
- Check how steep a cone can be spun in one pass
Who it is for
- Forming engineers
- Spinning machine operators
- Manufacturing engineers
What you get
- Starting blank thickness
- Tangential roller force
- Power at the roller
Interpreting the result
- Thickness reduction (1 − sin α) is the measure of severity; stay within the material’s tested limit.
References
- Machinery’s Handbook, 29th edition (Industrial Press, 2012), printed pp. 1362–1364. Topic reference; no source tables or recommended settings are reproduced.
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