Method and bladder apparatus for forming composite parts
View Patent ↗A material forming apparatus and method for shaping a material to a forming tool having complex contours. The material forming apparatus may comprise a bladder sealed to a support structure, cooperatively forming a hollow space therebetween into which air or another gas may be pumped to inflate the bladder. The forming tool may comprise a protrusion of any shape to which the material may conform. The material may be placed between the bladder and the protrusion and the support structure may be actuated toward the forming tool. As the support structure progresses toward the forming tool, an area of material pressed against the protrusion by the bladder increases in an outward direction. A pressure regulator may regulate an amount of pressure applied to the material by the bladder as the bladder presses the material against the forming tool.
1. A method of shaping a material, the method comprising:
placing the material between an inelastic inflatable bladder and a convex protrusion, the inelastic inflatable bladder having a proximal end and a distal end opposite the proximal end, the proximal end of the inelastic inflatable bladder being connected to a support structure, the distal end of the inelastic inflatable bladder being unsupported, the inelastic inflatable bladder having a thickness such that the inelastic inflatable bladder is configured to conform to contours of the convex protrusion, the convex protrusion comprising a top surface, two flange surfaces, and two side surfaces extending between the top surface and the two flange surfaces;
pumping air, liquid, or gas into the inelastic inflatable bladder; and after pumping air, liquid, or gas into the inelastic inflatable bladder is inflated, actuating the inflated inelastic inflatable bladder and the support structure in a direction toward the convex protrusion such that the inelastic inflatable bladder conforms to the contours of the convex protrusion by first pressing the material against the top surface of the convex protrusion, then progressively pressing the material against the two side surfaces of the convex protrusion, and finally pressing the material against the two flange surfaces of the convex protrusion as the inelastic inflatable bladder and the support structure move closer to the convex protrusion.
2. The method of claim 1 , further comprising regulating an amount of pressure applied to the material as the inelastic inflatable bladder presses the material against the convex protrusion by adjusting an amount of air, liquid, or another gas in the inelastic inflatable bladder.
3. The method of claim 1 , further comprising curing the material after the material is pressed against an entire surface area of the convex protrusion.
4. The method of claim 1 , wherein the material is a composite material.
5. The method of claim 1 , wherein the inelastic inflatable bladder and the support structure cooperatively form a hollow space between the inelastic inflatable bladder and the support structure, wherein pumping air, liquid, or gas Into the inelastic inflatable bladder comprises injecting air, liquid, or another gas into the hollow space between the inelastic inflatable bladder and the support structure.
6. The method of claim 5 , wherein the convex protrusion comprises an elongated trapezoidal-shaped protrusion extending outward from and integral to a forming tool, wherein the trapezoidal-shaped protrusion has a total width approximately equal to a width of the support structure and a maximum height approximately equal to or less than a height of the support structure.
7. The method of claim 1 , wherein the support structure is an elongated c-channel having a top wall and two side walls, wherein the inelastic inflatable bladder is inflatable material sealed to the support structure at or proximate to peripheral edges of the support structure.
8. The method of claim 2 , wherein adjusting the amount of air, liquid, or gas in the inelastic inflatable bladder comprises at least one of pumping air, liquid, or another gas through an inlet to inflate the inelastic inflatable bladder and releasing air, liquid, or another gas through an outlet to deflate the inelastic inflatable bladder.
9. The method of claim 1 , further comprising the step of instructing an actuator to move the inelastic inflatable bladder in at least two directions.
10. The method of claim 1 , wherein the step of moving the inelastic inflatable bladder comprises a human operator manually moving the inelastic inflatable bladder.
11. The method of claim 1 , further comprising the step of heating the material.
12. The method of claim 1 , further comprising the step of progressively pressing the material down the side surfaces of the convex protrusion.
13. The method of claim 1 , further comprising the steps of sensing a pressure of the inelastic inflatable bladder, receiving feedback representative of the pressure, and moving the inelastic inflatable bladder according to the feedback.
14. The method of claim 13 , wherein the step of receiving the feedback comprises a human operator monitoring a display and the step of moving the inelastic inflatable bladder comprises the human operator providing an input.
15. The method of claim 1 , wherein the material includes a central point and at least one outer portion, and wherein the step of moving the inelastic inflatable bladder includes the steps of applying pressure at the central point of the material followed by applying pressure to the at least one outer portion of the material.
16. A method of shaping composite material to form a composite part, the method comprising:
pumping air, liquid, or another gas into a hollow space between an inelastic inflatable bladder and a support structure comprising an elongated channel, the inelastic inflatable bladder having a proximal end and a distal end opposite the proximal end, the proximal end of the inelastic inflatable bladder being sealed to the support structure at or proximate to peripheral edges of the support structure, the distal end of the inelastic inflatable bladder being unsupported;
placing the composite material between the inelastic inflatable bladder and a convex forming tool, wherein the convex forming tool comprises a top surface, two flange surfaces, and two side surfaces extending between the top surface and the two flange surfaces, the inelastic inflatable bladder having a thickness such that the inelastic inflatable bladder is configured to conform to contours of the convex forming tool;
heating the composite material;
after pumping air, liquid, or another gas into the hollow space between the inelastic inflatable bladder and the support structure, actuating the support structure toward the convex forming tool such that the inelastic inflatable bladder conforms to the contours of the convex forming tool by first pressing the material against the top surface of the convex forming tool, then progressively pressing the material against the two side surfaces of the convex forming tool, and finally pressing the material against the two flange surfaces of the convex forming tool as the support structure moves closer to the convex forming tool; and
curing the composite material.
17. The method of claim 16 , further comprising regulating an amount of pressure applied to the material as the inelastic inflatable bladder presses the material against the convex forming tool by venting some air, liquid, or another gas out of the bladder or pumping more air, liquid, or another gas into the inelastic inflatable bladder.
18. A method of shaping composite material to form a composite part, the method comprising:
pumping air, liquid, or another gas into a hollow space between an inelastic inflatable bladder and a support structure comprising an elongated channel, the inelastic inflatable bladder having a proximal end and a distal end opposite the proximal end, the proximal end of the inelastic inflatable bladder being sealed to the support structure at or proximate to peripheral edges of the support structure, the distal end of the inelastic inflatable bladder being unsupported;
placing the composite material between the inelastic inflatable bladder and a forming tool, wherein the forming tool comprises a top surface, two flange surfaces, and two side surfaces extending between the top surface and the flange surfaces to form a substantially trapezoid-shaped protrusion between the two flange surfaces, wherein the width of the trapezoid-shaped protrusion is approximately equal to a width of the elongated channel, the inelastic inflatable bladder having a thickness such that the inelastic inflatable bladder is configured to conform to contours of the forming tool;
heating the composite material;
actuating the support structure toward the forming tool after pumping air, liquid, or another gas into the hollow space such that the inelastic inflatable bladder conforms to the contours of the forming tool by first pressing the material against the top surface of the forming tool, then progressively pressing the material against the two side surfaces of the forming tool, and finally pressing the material against the two flange surfaces of the forming tool as the support structure moves closer to the forming tool;
sensing an internal pressure of the inelastic inflatable bladder;
receiving feedback representative of the pressure:
actuating the support structure in a predetermined direction in response to the feedback; and
curing the composite material.
19. The method of claim 1 , wherein the convex protrusion further comprises at least one corner, and wherein the step of actuating the support structure includes pressing the material into the at least one corner of the convex protrusion.