Bending die with radial cam unit

1. An apparatus for bending a workpiece, comprising:

a backing surface that is operable to support the workpiece;

a mounting structure that is operable to move linearly between a first position and a second position, wherein movement from the first position to the second position is in a direction toward the backing surface;

a first bending surface that is fixedly connected to the mounting structure for movement in unison with the mounting structure, wherein the first bending surface is operable to engage and deform a first portion of the workpiece during linear motion of the mounting structure from the first position to the second position; and

a second bending surface that is rotatably connected to the mounting structure such that a rotational axis of the second bending surface moves in unison with the mounting structure and the second bending surface rotates with respect to the first bending surface in response to movement of the mounting structure from the first position to the second position, wherein the second bending surface is operable to engage and deform a second portion of the workpiece during linear motion of the mounting structure from the first position to the second position, and the first bending surface is positioned with respect to the second bending surface such that the first bending surface and the second bending surface are operable to define a flange on the workpiece by deformation of the first portion of the workpiece and deformation of the second portion of the workpiece.

2. The apparatus of claim 1 , wherein at least a portion of the second bending surface is substantially arcuate.

3. The apparatus of claim 1 , wherein the first bending surface and the second bending surface are positioned adjacent to each other to define a substantially continuous bending surface when the mounting structure is in the first position.

4. The apparatus of claim 1 , wherein the second bending surface is rotatable with respect to the first bending surface between a first rotational position and a second rotational position.

5. The apparatus of claim 4 , wherein the first bending surface and the second bending surface are positioned adjacent to each other to define a substantially continuous bending surface when the second bending surface is in the first rotational position.

6. The apparatus of claim 4 , wherein the second bending surface moves from the first rotational position to the second rotational position in response to movement of the mounting structure from the first position to the second position.

7. The apparatus of claim 4 , further comprising:

a biasing element for biasing movement of the second bending surface toward the first position.

8. The apparatus of claim 1 , further comprising:

a backing die, wherein the backing surface is formed on the backing die.

9. The apparatus of claim 1 , further comprising:

a cam unit, wherein the second bending surface is defined on the cam unit; and

a driver, wherein the driver is disposed at a fixed position with respect to the backing surface, the driver engages the cam unit during movement of the mounting structure from the first position to the second position, and the second bending surface rotates with respect to the first bending surface in response to engagement of the driver with the cam unit.

10. The apparatus of claim 1 , further comprising:

a body that is connected to the mounting structure, wherein the first bending surface is defined on the body; and

a cam unit, wherein the second bending surface is defined on the cam unit and the cam unit is rotatably mounted to the body.

11. The apparatus of claim 10 , further comprising:

a driver, wherein the first bending surface and the second bending surface move linearly toward the driver during movement of the mounting structure from the first position to the second position.

12. A bending die, comprising:

a body;

a first bending surface defined on the body;

a cam unit that is rotatably mounted to the body for rotation between a first position and a second position;

a second bending surface defined on the cam unit, wherein the first bending surface and the second bending surface are positioned adjacent to each other to define a substantially continuous bending surface when the cam unit is in the first position; and

a driver, wherein the cam unit rotates with respect to the body from the first position to the second position during a bending operation in response to engagement of the driver with the cam unit.

13. The bending die of claim 12 , further comprising:

a biasing element for biasing movement of the second bending surface toward the first position.

14. The bending die of claim 12 , wherein the first bending surface is engagable with a workpiece during the bending operation to bend a first portion of the workpiece and the second bending surface is engagable with the workpiece during the bending operation to bend a second portion of the workpiece.

15. The bending die of claim 14 , further comprising:

a backing die for supporting at least a portion of the workpiece during the bending operation.

16. A bending die, comprising:

a body;

a first bending surface defined on the body;

a cam unit that is rotatably mounted to the body for rotation between a first position and a second position;

a second bending surface defined on the cam unit, wherein the first bending surface and the second bending surface are positioned adjacent to each other to define a substantially continuous bending surface when the cam unit is in the first position; and

a backing die for supporting at least a portion of a workpiece during a bending operation, wherein the first bending surface is engagable with the workpiece during the bending operation to bend a first portion of the workpiece and the second bending surface is engagable with the workpiece during the bending operation to bend a second portion of the workpiece, and the cam unit moves from the first position to the second position during the bending operation.