Forming of preconsolidated metal matrix composites
First Claim
Patent Images
1. A method of forming bends or deflections in a preconsolidated metal matrix composite workpiece consisting of boron, borsic, alumina or graphite filaments in aluminum or titanium base metals, said method comprising the steps of:
- (a) locating the composite workpiece between open male and female members of a forming die;
(b) bringing the workpiece and at least the die faces to a temperature of from approximately 910°
F. to approximately 935°
F.; and
,(c) closing the die members at a rate of from 5 to 12 mils per minute after both male and female die members are in contact with the workpiece and until the die members are completely closed.
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Abstract
A method of hot forming bends or deflections in preconsolidated metal matrix composite panels comprised of unidirectional filaments of boron, borsic, alumina, or graphite in aluminum or titanium base metals without limitation of orientation of the filaments relative to axes of the formed bends or deflections.
90 Citations
21 Claims
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1. A method of forming bends or deflections in a preconsolidated metal matrix composite workpiece consisting of boron, borsic, alumina or graphite filaments in aluminum or titanium base metals, said method comprising the steps of:
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(a) locating the composite workpiece between open male and female members of a forming die; (b) bringing the workpiece and at least the die faces to a temperature of from approximately 910°
F. to approximately 935°
F.; and
,(c) closing the die members at a rate of from 5 to 12 mils per minute after both male and female die members are in contact with the workpiece and until the die members are completely closed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A male and female member tool die set for forming bends or deflections in a preconsolidated metal matrix composite workpiece consisting of boron, borsic, alumina or graphite filaments in aluminum or titanium base metals such that at least one bend or deflection is oriented so that at least some of the filaments of the composite workpiece are angulated to at least one bend or deflection axis with said forming accomplished at a temperature of approximately 910°
- F. to approximately 935°
F. for the workpiece and at least the die member forming faces, said tool die set containing the properties of;(a) at least part of the surface portions of the die members forming the inner radius of at least one deformation in the formed workpiece is polished to a finish of 8-16 RMS; (b) at least one workpiece forming surface of at least one of said die members includes a springback angle of from approximately 3°
to approximately 15°
; and
,(c) the clearance between a forming surface of the male die member and a confronting female die member surface that is traversed by said male die member surface during die closure is from approximately 1.3 to approximately 1.5 times the thickness of the workpiece.
- F. to approximately 935°
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12. A formed workpiece of a preconsolidated metal matrix composite consisting of boron, borsic, alumina or graphite filaments in aluminum or titanium base metals having at least one bend or deflection formed in the workpiece with at least some of the filaments of the composite workpiece located at an angle to the axis of the bend or deflection with said forming resulting from:
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(a) locating the composite workpiece between open male and female members of a forming die; (b) bringing the workpiece and at least the die faces to a temperature of from approximately 910°
F. to approximately 935°
F.; and
,(c) closing the die members at a rate of from 5 to 12 mils per minute after both male and female die members are in contact with the workpiece and until the die members are completely closed. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification