Multi-stage incremental sheet forming systems and methods

Patent metadata

Field	Value
Publication number	US-11579583-B2
Application number	US-202016853904-A
Country	US
Kind code	B2
Filing date	Apr 21, 2020
Priority date	Apr 21, 2020
Publication date	Feb 14, 2023
Grant date	Feb 14, 2023

Abstract

A multi-stage incremental sheet forming system includes a forming tool, and at least one control unit in communication with the forming tool. The at least one control unit is configured to determine a convex hull of a target structure to be formed by the forming tool. The at least one control unit is further configured to operate the forming tool according to a first tool path in relation to an initial structure to form an intermediate structure having a shape based on the convex hull of the target structure. The at least one control unit is further configured to operate the forming tool according to a second tool path in relation to the intermediate structure to form one or more inward features into the intermediate structure to form the target structure.

First claim

What is claimed is:

1. A multi-stage incremental sheet forming system, comprising:
a forming tool;
and at least one control unit in communication with the forming tool,
the at least one control unit configured to determine a convex hull of a target structure to be formed by the forming tool, wherein the convex hull is the smallest convex set that contains all points of the target structure,
the at least one control unit configured to operate the forming tool according to a first tool path in relation to an initial structure to form an intermediate structure having a shape based on the convex hull of the target structure,
and the at least one control unit configured to operate the forming tool according to a second tool path in relation to the intermediate structure to form one or more inward features into the intermediate structure to form the target structure, wherein the second tool path differs from the first tool path.

2. The multi-stage incremental sheet forming system of claim 1 , wherein the at least one control unit comprises:
a tool path generation control unit configured to determine at least one tool path and the convex hull of the target structure; and
a forming control unit configured to operate the forming tool.

3. The multi-stage incremental sheet forming system of claim 1 , wherein the at least one control unit comprises a tool path generation control unit configured to determine the convex hull of the target structure based on the smallest convex set that contains all points of the target structure.

4. The multi-stage incremental sheet forming system of claim 1 , further comprising a structure database in communication with the at least one control unit, wherein the structure database stores target data including information regarding a size of the target structure, a shape of the target structure, the one or more inward features of the target structure, and manufacturing data including tool shape, tool size, and tool feed rate.

5. The multi-stage incremental sheet forming system of claim 1 , wherein the at least one control unit comprises a tool path generation control unit including a convex hull determination module that analyzes target data regarding the target structure and determines the convex hull for the target structure based on the target data.

6. The multi-stage incremental sheet forming system of claim 1 , wherein the at least one control unit comprises a tool path generation control unit including a convex hull tool path generation module that determines the first tool path based on the determined convex hull, and wherein a forming control unit operates the forming tool according to the first tool path in relation to the initial structure to form the intermediate structure having the shape based on the convex hull of the target structure.

7. The multi-stage incremental sheet forming system of claim 1 , wherein the first tool path is a Z level tool path.

8. The multi-stage incremental sheet forming system of claim 1 , wherein the at least one control unit comprises a tool path generation control unit including a target structure tool path generation module that is configured to one or both of operate or output instructions for operating the forming tool according to the second tool path in relation to the intermediate structure to form the one or more inward features into the intermediate structure to form the target structure.

9. The multi-stage incremental sheet forming system of claim 1 , wherein the second tool path is a lace tool path.

10. The multi-stage incremental sheet forming system of claim 1 , wherein the one or more inward features comprises one or more of at least one indentation, at least one cavity, at least one divot, at least one channel, at least one recess, at least one groove, at least one crease, at least one pocket, at least one inset, or at least one hole.

11. The multi-stage incremental sheet forming system of claim 1 , wherein the target structure comprises at least one wall set at an angle of at least sixty degrees in relation to a level plane.

12. The multi-stage incremental sheet forming system of claim 1 , wherein the intermediate structure is devoid of the one or more inward features.

13. A multi-stage incremental sheet forming method, comprising:
determining, by at least one control unit, a convex hull of a target structure to be formed by a forming tool, wherein the convex hull is the smallest convex set that contains all points of the target structure;
operating, by the at least one control unit, the forming tool according to a first tool path in relation to an initial structure to form an intermediate structure having a shape based on the convex hull of the target structure;
and operating, by the at least one control unit, the forming tool according to a second tool path in relation to the intermediate structure to form one or more inward features into the intermediate structure to form the target structure, wherein the second tool path differs from the first tool path.

14. The multi-stage incremental sheet forming method of claim 13 , further comprising storing, in a structure database, target data including information regarding a geometric representation of the target structure including the one or more inward features of the target structure.

15. The multi-stage incremental sheet forming method of claim 13 , wherein said determining comprises determining, by a convex hull determination module, the convex hull of the target structure.

16. The multi-stage incremental sheet forming method of claim 13 , wherein said operating, by the at least one control unit, the forming tool according to the first tool path comprises operating, by a convex hull tool path generation module, the forming tool according to the first tool path in relation to the initial structure to form the intermediate structure having the shape based on the convex hull of the target structure.

17. The multi-stage incremental sheet forming method of claim 13 , wherein the first tool path is a Z level tool path, and wherein the second tool path is a lace tool path.

18. The multi-stage incremental sheet forming method of claim 13 , wherein said operating, by the at least one control unit, the forming tool according to the second tool path comprises operating, by a target structure tool path generation module, the forming tool according to the second tool path in relation to the intermediate structure to form the one or more inward features into the intermediate structure to form the target structure.

19. The multi-stage incremental sheet forming method of claim 13 , wherein the one or more inward features comprises one or more of at least one indentation, at least one cavity, at least one divot, at least one channel, at least one recess, at least one groove, at least one crease, at least one pocket, at least one inset, or at least one hole.

20. The multi-stage incremental sheet forming method of claim 13 , wherein the target structure comprises at least one wall set at an angle of at least sixty degrees in relation to a reference plane.

21. The multi-stage incremental sheet forming method of claim 13 , wherein the intermediate structure is devoid of the one or more inward features.

22. A multi-stage incremental sheet forming system, comprising:
a forming tool;
at least one control unit in communication with the forming tool;
and a structure database in communication with the at least one control unit, wherein the structure database stores target dat

Assignees

• Boeing Co

Inventors

• Elford Michael C

Classifications

• G05B19/4099 Primary

  Surface or curve machining, making three-dimensional [3D] objects, e.g. desktop manufacturing · CPC title

• G05B19/402

  characterised by control arrangements for positioning, e.g. centring a tool relative to a hole in the workpiece, additional detection means to correct position (G05B19/19 takes precedence) · CPC title

• B21J5/06

  for performing particular operations · CPC title

• B21D5/004

  with program control · CPC title

• G06F16/25

  Integrating or interfacing systems involving database management systems · CPC title