Patent ID: 6986856

Claim:
A method for manufacturing at least one piece having the form of a round ring and being symmetric regarding two levels comprising: a cast mould with at least two profile plates movably attached to the mould forming part of the mould and forming an opening for filling the mould, the profile plates having mutually matching profile surfaces; and fan profile plates which are perpendicular with a central axle of the cylinder surface so that an interior radius of the fan profile plate corresponds to a respective radius of the cylinder surface, the fan profile plates being around the central axle of the cylinder surface and in the extension corresponding to the extent of concerned surface; wherein a convex cylinder surface is either placed in a separate changeable element of the mould, in which it can be changed to an arched surface having a different radius, or placed in the element of the mould having a radius that can be adjusted, and each of the fan profile plates perpendicular with the cylinder surface is assembled of straight profile plates, each of the fan profile plates comprises at least two side by side installed plates placed in extension of each other and placed adjacently or attached to each other so that they form a rotation surface, the central point of the rotation surface is in the central axle of the cylinder surface.