Hollow body, process for manufacturing it and use thereof in a vehicle

Abstract

A process for manufacturing a hollow body including a thermoplastic wall and a fibrous reinforcement welded on at least one portion of the surface of the wall, or its outer surface, the fibrous reinforcement including a thermoplastic similar to or compatible with that of the wall of the hollow body, having a thickness of at least 1 mm and from 30 to 60% in weight of fibers, the method including heating a portion of the outer surface of the hollow body where the reinforcement will be welded; heating the fibrous reinforcement to soften or melt the thermoplastic of the reinforcement; and moving the reinforcement and applying the reinforcement to the portion of the outer surface of the hollow body. The applying the reinforcement includes: applying an initial pressure on at least one portion of the reinforcement; and applying pressure for a final welding using robotized pressure applying mechanism.

Claims

1. A process to manufacture a hollow body including a thermoplastic wall and a fibrous reinforcement welded on at least one portion of a surface of the hollow body, the fibrous reinforcement including a thermoplastic similar to or compatible with that of the wall of the hollow body, having a thickness of at least 1 mm and including from 30 to 60% in weight of fibers, the process comprising: heating a portion of the surface of the hollow body where the fibrous reinforcement will be welded; heating the fibrous reinforcement to soften or melt the thermoplastic of the fibrous reinforcement; and gripping and moving the reinforcement using suction cups and applying the reinforcement to the portion of the surface of the hollow body, wherein the suction cups and a robotized pressure applying device are located on a same robot hand, wherein the applying the reinforcement to the portion of the surface of the hollow body further comprises: applying an initial pressure on at least one portion of the fibrous reinforcement; pivoting the robot hand from a gripping position to a pressure applying position; and applying pressure for a final welding using the robotized pressure applying device, wherein the pivoting is conducted between the applying of the initial pressure and the applying of the pressure for the final welding.

2. The process according to claim 1, wherein the robotized pressure applying device includes at least one roller.

3. The process according to claim 1, wherein a welding portion comprises a 3D surface and the fibrous reinforcement is shaped during the final welding.

4. The process according to claim 1, further comprising applying an internal pressure to the hollow body during the heating, during the heating the portion of the surface of the hollow body, during the final welding, and/or after the final welding.

5. The process according to claim 1, wherein the heating the portion of the surface of the hollow body and the fibrous reinforcement uses infrared radiation (IR).

6. The process according to claim 1, wherein the fibrous reinforcement is put on a grid and infrared radiation (IR) heated on at least one side.

7. The process according to claim 1, further comprising using a movable grid upon which the fibrous reinforcement is put, the movable grid being insertable between two infrared radiation (IR) heaters fixed on a chassis or between an IR module placed on top of the reinforcement/grid and a reflective surface underneath the reinforcement/grid to heat the fiber reinforcement.

8. The process according to claim 1, further comprising using a heater and a mask or metal plate cooled down with a water circuit, which is placed between the heater and the hollow body, and which has an opening with a shape and size similar to those of the fibrous reinforcement to heat the fibrous reinforcement.

9. The process according to claim 1, wherein the hollow body comprises a wall that defines an internal volume for storing and/or transporting a fluid on board a vehicle and is obtained by blow molding.

10. The process according to claim 9, the hollow body being a vehicle fuel tank, or a hybrid vehicle fuel tank, a filler pipe, a turbo charger duct, or an ammonia precursor tank of an SCR system.

11. The process according to claim 1, wherein the fibrous reinforcement comprises continuous fibers that are woven.

12. The process according to claim 1, wherein the fibrous reinforcement comprises glass fibers.

13. The process according to claim 1, wherein the fibrous reinforcement contains fibers up to 0.05 mm from its surface.

14. The process according to claim 1, wherein at least one row of the suction cups is mounted on a rail.

15. The process according to claim 14, wherein each suction cup is fixed on a knuckle.

16. The process according to claim 14, wherein each suction cup is mounted on a spring.

17. The process according to claim 14, wherein the initial pressure is applied via the suction cups.

18. A process to manufacture a hollow body including a thermoplastic wall and a fibrous reinforcement welded on at least one portion of a surface of the hollow body, the fibrous reinforcement including a thermoplastic similar to or compatible with that of the wall of the hollow body, having a thickness of at least 1 mm and including from 30 to 60% in weight of fibers, the process comprising: using a movable grid upon which the fibrous reinforcement is put, the movable grid being inserted between two infrared radiation (IR) heaters fixed on a chassis or between an IR module placed on top of the reinforcement/grid and a reflective surface underneath the reinforcement/grid to heat the fibrous reinforcement; heating a portion of the surface of the hollow body where the fibrous reinforcement will be welded; heating the fibrous reinforcement to soften or melt the thermoplastic of the fibrous reinforcement; and moving the reinforcement and applying the reinforcement to the portion of the surface of the hollow body, wherein the applying the reinforcement to the portion of the surface of the hollow body comprises: applying an initial pressure on at least one portion of the fibrous reinforcement; and applying pressure for a final welding using a robotized pressure applying device.

19. A process to manufacture a hollow body including a thermoplastic wall and a fibrous reinforcement welded on at least one portion of a surface of the hollow body, the fibrous reinforcement including a thermoplastic similar to or compatible with that of the wall of the hollow body, having a thickness of at least 1 mm and including from 30 to 60% in weight of fibers, the process comprising: using a heater and a mask or metal plate cooled down with a water circuit, which is placed between the heater and the hollow body, and which has an opening with a shape and size similar to those of the fibrous reinforcement to heat the fibrous reinforcement; heating a portion of the surface of the hollow body where the fibrous reinforcement will be welded; heating the fibrous reinforcement to soften or melt the thermoplastic of the fibrous reinforcement; and moving the reinforcement and applying the reinforcement to the portion of the surface of the hollow body, wherein the applying the reinforcement to the portion of the surface of the hollow body comprises: applying an initial pressure on at least one portion of the fibrous reinforcement; and applying pressure for a final welding using a robotized pressure applying device.

20. A process to manufacture a hollow body including a thermoplastic wall and a fibrous reinforcement welded on at least one portion of a surface of the hollow body, the fibrous reinforcement including a thermoplastic similar to or compatible with that of the wall of the hollow body, having a thickness of at least 1 mm and including from 30 to 60% in weight of fibers, the process comprising: heating a portion of the surface of the hollow body where the fibrous reinforcement will be welded; heating the fibrous reinforcement to soften or melt the thermoplastic of the fibrous reinforcement; and gripping and moving the reinforcement using suction cups and applying the reinforcement to the portion of the surface of the hollow body, wherein the suction cups and a robotized pressure applying device are located on a same robot hand, wherein the applying the reinforcement to the portion of the surface of the hollow body further comprises: applying an initial pressure on at least one portion of the fibrous reinforcement; pivoting the robot hand from a gripping position to a pressure applying position; and applying pressure for a final welding using the robotized pressure applying device, wherein the suction cups are located on one side of the robot hand mounted on a robot arm and the robotized pressure applying device is located on an other side of the robot hand.

Description

(1) As already explained above, the present invention is illustrated, non-limitingly, by appended FIGS. 1 to 4 which schematically represent:

(2) FIG. 1: a heating station for heating a reinforcement according to an embodiment of the invention and comprising a movable grid inserted between two IR heaters fixed on a chassis;

(3) FIG. 2: a heating station for heating a tank according to an embodiment of the invention and comprising a mask allowing to only heat the welding zone of the tank, and lamps mounted on a chassis; and

(4) FIGS. 3 and 4: side and top views of a robot hand with respectively suction cups on one side and a roller on the other side.