Tumbling (manufacturing process)
Tumbling (sometimes also called radial riveting ) is a cold forming process in which the forming force only acts on a partial surface of the workpiece. With a wobbling movement of the upper die on a rotationally symmetrical workpiece, a large deformation can be achieved with relatively little effort .
Procedure
The workpiece is placed in a die that fixes it from below. This die is clamped on the fixed part of a wobble press. The workpiece is cold formed from above with one or more rotating dies one after the other. The upper die is inclined at a certain angle to its axis of rotation. This results in a rolling motion under which the metal of the workpiece can flow into its new shape. Much larger deformations are possible through tumbling than through deep drawing or simple upsetting . Tumbling is related to pushing . In contrast, much more complex shapes are possible. For example, teeth or ribs can be fully formed by tumbling.
Applications
There are multiple uses that are tumbled:
- rivets close
- Spring Plungers close
- Ballpoint pen tips
- Gears and sprockets
- Wheel hubs
- Production of fasteners
- Electrical components
- Coupling axles
See also
Web links
- Tumbling technology in a new dimension. umformtechnik.net
- Orbital riveting machines kmt-vogt