Method to reduce tool marks in incremental forming

1. A method of incrementally forming more than one workpiece comprising:

securing a first sacrificial material layer to at least one surface of a first workpiece;

imparting a first force directly to the first sacrificial material layer with a first forming tool to incrementally form the first workpiece to a desired geometry based on a tool path of the first forming tool;

removing the first sacrificial material layer from the incrementally formed first workpiece;

securing the first sacrificial material layer to at least one surface of a second workpiece; and

imparting a second force directly to the first sacrificial material layer with the first forming tool to incrementally form the second workpiece to another desired geometry based on another tool path of the first forming tool.

2. The method according to claim 1 further comprising:

securing a second sacrificial material layer to an opposite surface of the first workpiece before imparting the first force directly to the first sacrificial material layer with the first forming tool; and

imparting a third force directly to the first and second sacrificial material layer with an opposed second forming tool when the first force is directly imparted to the first sacrificial material layer and before removing the first sacrificial material layer from the incrementally formed first workpiece.

3. The method according to claim 2 further comprising:

removing the second sacrificial material layer from the opposite surface of the incrementally formed first workpiece;

securing the second sacrificial material layer to an opposite surface of the second workpiece before imparting the second force directly to the first sacrificial material layer with the first forming tool; and

imparting a fourth force directly to the second sacrificial material layer secured to the second workpiece with the opposed second forming tool when the second force is directly imparted to the first sacrificial material layer.

4. The method according to claim 1 , wherein the first sacrificial material layer is secured around a periphery of the workpiece.

5. The method according to claim 1 further comprising applying a lubricant to an outer surface of the first sacrificial material layer before imparting the first force and the second force directly to the first sacrificial material layer with the first forming tool.

6. The method according to claim 1 , wherein the first sacrificial material layer is a metal sheet.

7. The method according to claim 6 , wherein the metal sheet is a low carbon steel having a thickness between 0.1mm and 1.0mm.

8. The method according to claim 1 , wherein the first sacrificial material layer is a protective film.

9. The method according to claim 8 further comprising applying an adhesive layer between the protective film and the workpiece.

10. A method of incrementally forming more than one workpiece comprising:

securing an elastomeric material to a surface of a first workpiece;

securing a sacrificial material layer to the elastomeric material;

incrementally forming the first workpiece by applying forces directly to the sacrificial material layer;

removing the sacrificial material layer from the elastomeric material;

removing the elastomeric material from the surface of the first workpiece;

securing the elastomeric material to a surface of a second workpiece;

securing the sacrificial material layer to the elastomeric layer material; and

incrementally forming the second workpiece by applying forces directly to the sacrificial material layer.

11. The method according to claim 10 , wherein the elastomeric material and the sacrificial material layer is secured around a periphery of the workpiece.

12. The method according to claim 10 further comprising applying a lubricant to an outer surface of the sacrificial material layer before at least one of incrementally forming the first workpiece by applying forces directly to the sacrificial material layer, and incrementally forming the second workpiece by applying forces directly to the sacrificial material layer.

13. The method according to claim 10 , wherein the sacrificial material layer is a metal sheet.

14. The method according to claim 13 , wherein the metal sheet is a low carbon steel having a thickness between 0.1mm and 1.0mm.