Method of planar forming of zero degree composite tape

• US 4,726,924 A
• Filed: 04/14/1986
• Issued: 02/23/1988
• Est. Priority Date: 06/28/1984
• Status: Expired due to Fees

• Current Assignee: The Boeing Co.
• Original Assignee: The Boeing Co.
• Inventors: Mittelstadt, Robert F.
• Primary Examiner(s): Czaja, Donald E.
• Assistant Examiner(s): FALASCO, LOUIS V
• Application Number:
  US06/851,223
• Time in Patent Office: 680 Days
• Field of Search: 156/103, 156/164, 156/161, 156/181, 156/180, 156/200, 156/201, 156/290, 156/324, 156/433, 156/461, 156/463, 156/539, 156/544, 156/562, 156/581, 156/485, 156/212, 156/213, 100/211, 100/296, 264/136, 264/137, 264/325, 264/285, 264/257, 264/258
• US Class Current: 264/257
• CPC Class Codes: B29B 15/08 of reinforcements or fillers chemical aspects C08J, C08K
• CPC Class Codes: B29C 53/04 of plates or sheets B29C63/04 takes precedence; bending or folding paper B31F1/0003; folding films B65H45/00
• CPC Class Codes: B29C 53/16 Straightening or flattening
• CPC Class Codes: B29C 70/20 oriented in a single direction, e.g. roofing or other parallel fibres B29C70/083, B29C70/226 take precedence
• CPC Class Codes: B29C 70/386 Automated tape laying [ATL]
• CPC Class Codes: B29C 70/541 Positioning reinforcements in a mould, e.g. using clamping means for the reinforcement positioning inserts in moulds B29C33/12; lay-up on a mould B29C70/30
• CPC Class Codes: B29D 99/0003 Producing profiled members, e.g. beams
• CPC Class Codes: B29K 2105/06 containing reinforcements, fillers or inserts
• CPC Class Codes: Y10T 156/103 Encasing or enveloping the configured lamina

Abstract

A straight length of tape (100) is confined in a cavity having a thickness and width essentially the same as the thickness and width of the tape (100). The cavity is defined by upper and lower opposing sets of thin flexible strips (24). In each set, strips (24) are positioned with their faces abutting each other and their inner side edges confronting the inner side edges of the strips (24) in the other set to define the thickness of the cavity therebetween. A series of longitudinally spaced clamps (28) press the strips (24) against the tape (100) to exert on the tape (100) pressure of sufficient magnitude and uniformity to prevent buckling and wrinkling of the tape (100). With the tape confined, a series of longitudinally spaced drive units (50) bend the strips (24) and tape (100) into a desired planform configuration. The tape (100) is held confined in this planform configuration until the tape (100) stabilizes in its new configuration.

Claims

1. A method of forming fiber reinforced composite material tape in the general plane of the tape, comprising:

exerting pressure on the tape in a thicknesswise direction perpendicular to said plane to confine the tape to an elongated space having essentially the same thickness and width as the tape;

bending said space and the tape confined therein by said pressure in a widthwise direction perpendicular to said thicknesswise direction, to form said space and tape into a predetermined planform configuration; and

while so bending said space and tape, continuing to confine the tape to said space to prevent buckling and wrinkling of the tape.

2. A method as described in claim 1, further comprising after bending said space and tape, maintaining said space in said configuration and continuing to confine said tape to said space for a period of time sufficient to allow said tape to stabilize in said configuration.

3. A method as described in claim 1, in which the step of bending comprises applying a plurality of bending forces at intervals spaced along the tape, and independently controlling each such bending force to define said configuration.

4. A method as described in claim 1, in which the step of exerting pressure comprises operating a plurality of clamping devices spaced longitudinally along the tape, and the step of bending comprises moving said devices in said widthwise direction and independently controlling the movement of each device to define said configuration.