Additive manufacturing method for a turbofan engine oil tank

A manufacturing method of at least one turbojet engine tank with a shell, said method comprising the following stages:

• definition of different shell sections for each tank, whereof a first shell section includes a recess, a second shell section includes a boss and a third shell section comprises a recess and a boss, wherein the recess of the first shell section is of a shape matching the shape of the boss of the second shell section;
• and
• production of the shell sections by additive manufacturing, wherein the production stage comprises the production by additive manufacturing of the boss of the second shell section within the recess of the first shell section,
• wherein the first shell section, the second shell section, and the third shell section each comprise a spheroidal portion and a tubular portion, said spheroidal portion defining a respective central spheroidal radial direction and said tubular portion defining a respective central tubular radial direction, said spheroidal portions being embedded one in the other at the end of the production stage, and said tubular portions being embedded one in the other at the end of the production stage,
• wherein the production stage comprises the production by additive manufacturing of the boss of the second shell section and the boss of the third shell section within the recess of the first shell section;
• the third shell section being embedded in the recess of the first shell section through the boss of the second shell section,
• wherein the production stage is such that at the end of the production stage, the first, second and third shell sections are offset with respect to one another in such a way that their respective central spheroidal radial direction coincide and their respective central tubular radial direction coincide.