Toolset and method for producing a metal liner

1. Toolset for manufacturing a metal liner for a composite vessel, comprising:

a mandrel configured in several mandrel elements forming support elements of primary parts constituting the metal liner, wherein, the metal liner comprises a vessel liner with rounded ends, and the support elements comprise a front body and a rear body to receive respectively a first rounded metal liner end and a second rounded metal liner end; and

annular sectors designed to be positioned on junction ends of said front body and rear body to support junction ends of said first rounded metal liner end and said second rounded metal liner end, wherein the mandrel elements are parts made of a soluble material.

2. Toolset according to claim 1 , wherein said annular sectors are sectors made of steel.

3. Toolset according to claim 1 , wherein the annular sectors comprise a peripheral annular setback designed to form an annular channel with a peripheral annular setback of an adjacent sector.

4. Toolset according to claim 1 , wherein the annular sectors are removable sectors.

5. Toolset according to claim 1 , wherein the parts made of a soluble material are wrapped in a sealant skin.

6. Toolset according to claim 1 , wherein at least some of the mandrel elements are revolving parts mounted on a bearing axle of the mandrel.

7. Toolset according to claim 1 , wherein at least some of the mandrel elements are mounted on receiving tubes of a bearing axle of the mandrel.

8. Method for producing an object comprising a metal liner, comprising:

placing metal portions of a metal liner on mandrel elements;

assembling elements of the mandrel bearing the portions of the metal liner; and

welding metal portions of the metal liner onto the assembled mandrel elements; and

positioning annular sectors on junction ends of said mandrel elements before placing the metal liner portions on the mandrel elements.

9. Method according to claim 8 , wherein the object is a composite vessel, the method comprising winding fibers on the liner assembled on the elements of the mandrel.

10. Method according to claim 8 , wherein assembling elements of the mandrel is realized on a rotating drive axle of the mandrel.

11. Method according to claim 9 , wherein, the mandrel comprises a soluble mandrel, and the method comprises reabsorbing the mandrel after either the welding or the winding.

12. Method according to claim 8 , wherein welding portions of the liner assembled on the elements of the mandrel is realized by welding edges facing portions of the liner above channels at the annular sectors.

13. Method according to claim 8 , wherein placing said portions comprises:

heating the liner portions;

positioning the liner portions on the mandrel elements; and

cooling the liner portions producing a shrink-fitting of the liner portions on the mandrel elements.

14. Method according to claim 8 , wherein the object is a composite vessel with the metal liner, and wherein the mandrel elements are shaped into a front body and a rear body.

15. Method according to claim 8 , wherein the object is a composite vessel with a metal liner, and wherein the mandrel elements are shaped into a front body and, rear body and at least one intermediate cylindrical body.

16. Toolset for manufacturing a metal liner for a composite vessel, comprising a mandrel configured in several mandrel elements forming support elements of primary parts constituting the metal liner, wherein, the metal liner comprising a cylindrical vessel liner with rounded ends, the support elements comprise a front body, a rear body and at least one intermediate cylindrical body to receive respectively a first rounded metal liner end, a second rounded metal liner end and at least one cylindrical metal liner intermediate part, said toolset comprising further annular sectors designed to be positioned on junction ends of said front body, rear body and intermediate cylindrical body to support junction ends of said first rounded metal liner end, a second rounded metal liner end and at least one cylindrical metal liner intermediate part wherein the mandrel elements are parts made of a soluble material.

17. Toolset according to claim 16 , wherein, said annular sectors are sectors made of steel.

18. Toolset according to claim 16 , wherein the annular sectors comprise a peripheral annular setback designed to form an annular channel with a peripheral annular setback of an adjacent sector.

19. Toolset according to claim 16 , wherein the annular sectors are removable sectors.

20. Toolset according to claim 16 , wherein the parts made of a soluble material are wrapped in a sealant skin.

21. Toolset according to claim 16 , wherein at least some of the mandrel elements are revolving parts mounted on a bearing axle of the mandrel.

22. Toolset according to claim 16 , wherein at least some of the mandrel elements are mounted on receiving tubes of a bearing axle of the mandrel.