Apparatus for forming fiber composite materials

• US 4,955,803 A
• Filed: 10/18/1988
• Issued: 09/11/1990
• Est. Priority Date: 02/03/1986
• Status: Expired due to Fees

• Current Assignee: Board of Trustees of the Leland Stanford Junior University (Stanford University)
• Original Assignee: Board of Trustees of the Leland Stanford Junior University (Stanford University)
• Inventors: Miller, Alan K., Ramani, Karthik, Gur, Micha M.
• Primary Examiner(s): Woo, Jay H.
• Assistant Examiner(s): Durkin II, Jeremiah F.
• Application Number:
  US07/259,256
• Time in Patent Office: 693 Days
• Field of Search: 425/394, 425/363, 425/367, 425/366, 425/145, 425/397, 264/339, 264/40.7
• US Class Current: 425/145
• CPC Class Codes: B29C 53/043 using rolls or endless belts
• CPC Class Codes: B29K 2105/06 containing reinforcements, fillers or inserts

Abstract

An apparatus for continuously and progressively forming components from fiber-containing composite material workpieces having a deformable matrix introduces transverse bends into a workpiece that moves through the apparatus in a longitudinal or travel direction. Transverse bending of the composite material is accomplished in a kinematically admissible manner to avoid misalignment or failure of the composite material. A net bending deformation is introduced at a free transverse edge as the composite workpiece moves in a longitudinal direction, by pairs of compound roller elements between which the workpiece passes as it moves through the apparatus. the net deformation introduced at the free transverse edge is moved and distributed through the composite material workpiece during successive passes through the forming machinery, to form the final shaped component.

Claims

1. An apparatus for introducing and propagating bends in a composite material workpiece having a longitudinal direction and a transverse direction defined therefor, comprising:

deformation means for deforming the workpiece in the transverse direction, as the work piece is moved in the longitudinal direction, the deformation means including

a pair of opposing compound disk rollers each rotatably mounted on an axle lying parallel to the longitudinal direction, and spaced apart so that the workpiece passes between the compound rollers and in contact therewith.

a first single compound disk roller rotatably mounted on an axle lying parallel to the longitudinal direction, the compound disk rollers permitting the workpiece to roll thereover in both the longitudinal direction and the transverse direction;

means for moving the workpiece between the pair of opposing compound rollers, both in the longitudinal direction and in the transverse direction; and

means for moving the axle of the first single compound disk roller in a circular arc whose center is at the axis of rotation of a first one of the pair of opposing compound disk rollers and whose radius is equal to the sum of the radius of the first one of the pair of opposing compound disk rollers plus the radius of the first single compound roller plus the thickness of the composite material workpiece.

2. The apparatus of claim 1, further including:

a second single compound disk roller rotatably mounted on an axle lying parallel to the longitudinal direction, the second single compound disk roller permitting the workpiece to roll thereover in both the longitudinal direction and the transverse direction, and

means for moving the axle of the second single compound disk roller in a circular arc whose center is at the axis of rotation of the first single compound disk roller and whose radius is equal to the sum of the radius of the first single compound disk roller plus the radius of the second single compound disk roller plus the thickness of the composite material workpiece.

3. The apparatus of claim 1, wherein each of the compound disk rollers comprises

a roller support axle;

a roller support rotatably mounted on the roller support axle; and

a plurality of rollers rotatably mounted on secondary roller axles supported perpendicular to the roller support axle in a chordwise fashion on the roller support at equal distances from the roller support axle.

4. The apparatus of claim 1, wherein at least some of the compound disk rollers are driven to apply a surface traction to the workpiece.

5. The apparatus of claim 1, wherein the means for moving the workpiece includes a clamp disposed to be rigidly but removably affixed to the workpiece.

6. The apparatus of claim 1, further including

means for heating the workpiece in the region of the deformation means.

7. An apparatus for introducing and propagating bends in a composite material workpiece having a longitudinal direction and a transverse direction perpendicular to the longitudinal direction defined therefor, comprising:

deformation means for deforming the workpiece in the transverse direction, as the work piece is moved in the longitudinal direction, the deformation means including

a pair of opposing support elements spaced apart so that the workpiece passes between the support elements and in a contact therewith;

a single support element mounted to apply pressure to a convex facing surface of the bent workpiece at a location transversely displaced from a line connecting the pair of opposing support elements, the support elements permitting the workpiece to move thereover in both the longitudinal and transverse directions;

means for moving the workpiece between the pair of opposing support elements, in both the longitudinal and transverse directions;

means for controllably positioning the single support element relative to the pair of opposing support elements; and

a computer that provides a control signal to the means for controllably positioning.

8. The apparatus of claim 7, further including

means for heating the workpiece in the region of the deformation means.

9. The apparatus of claim 7, each support element of the pair of opposing support elements is a compound disk roller.

10. The apparatus of claim 7, wherein the single support element is a compound disk roller.

11. The apparatus of claim 7, wherein at least some of the support elements are driven to apply a surface traction to the workpiece.

12. The apparatus of claim 7, wherein the means for moving the workpiece includes a clamp disposed to be rigidly but removably affixed to the workpiece.

13. The apparatus of claim 7, further including a second single support element mounted to apply pressure to a face of the workpiece on a side opposite to that face to which the first single support element applies pressure.

14. An apparatus for introducing and propagating bends in a sheet of a composite material workpiece having a longitudinal direction and a transverse direction perpendicular to the longitudinal direction defined therefor, both the longitudinal direction and the transverse direction locally lying in the plane of the sheet, comprising:

forming unit means for changing the curvature of a sheet relative to a transverse direction thereof as the sheet is moved through the forming unit means parallel to a longitudinal direction of the sheet; and

means for moving the workpiece in the longitudinal direction through the forming unit means in a first pass, advancing the workpiece in the transverse direction after the first pass is complete, and then moving the workpiece in the longitudinal direction through the forming unit means in a second pass.

15. The apparatus of claim 14, wherein the forming unit means includes

a pair of opposing compound disk rollers each rotatably mounted on an axle lying parallel to the longitudinal direction, and spaced apart so that the workpiece passes between the compound rollers and in contact therewith,

a first single compound disk roller rotatably mounted on an axle lying parallel to the longitudinal direction, and

means for moving the axle of the first single compound disk roller relatively to the axles of the pair of opposing compound disk rollers.

16. The apparatus of claim 14, wherein the forming unit means includes

at least two forming elements, one on each side of and in contact with the sheet of composite material, each forming element including an articulated shaft with at least two rollers mounted thereon.

18. The apparatus of claim 14, further including

means for heating the workpiece in the region of the forming unit means.

17. An apparatus for introducing and propagating bends in a sheet of a composite material workpiece having a longitudinal direction and a transverse direction perpendicular to the longitudinal direction defined therefor, both the longitudinal direction and the transverse direction locally lying in the plane of the sheet, comprising:

forming unit means for changing the curvature of a sheet relative to a transverse direction thereof as the sheet is moved through the forming unit means parallel to a longitudinal direction of the sheet; and

means for moving the workpiece in the longitudinal direction through the forming unit means in a first pass, advancing the workpiece in the transverse direction after the first pass is complete, and then moving the workpiece in the longitudinal direction through the forming unit means in a second pass.

19. An apparatus for introducing and propagating bends in a sheet of a composite material workpiece having a longtiduinal direction and a transverse direction perpendicular to the longitudinal direction defined therefor, both the longitudinal direction and the transverse direction locally lying in the plane of the sheet, comprising:

a forming unit that applied a pressure to a surface of a sheet to change the curvature of the sheet relative to a transverse direction thereof as the sheet is moved through the forming unit parallel to a longitudinal direction of the sheet, the curvature of the sheet in the longitudinal direction remaining unchanged; and

means for moving the workpiece in the longitudinal direction through the forming unit means in a first pass, advancing the workpiece in the transverse direction after the first pass is complete, and then moving the workpiece in the longitudinal direction through the forming unit means in a second