METHOD FOR MANUFACTURING HOLLOW BOTTLE-SHAPED PART Russian patent published in 2021 - IPC B21D51/54 

FIELD: metallurgy.

SUBSTANCE: invention relates to the field of metal forming and can be used in the manufacture of bottle-shaped hollow parts having a wall thickness S, an area of ​​small diameter d, an area of ​​a larger diameter D and an area of ​​conical transition from a small diameter to a large one. In this case, d/D<0.4, S/D<0.03. A workpiece is made in the form of a truncated cone with a bottom by rotational extrusion. An area of ​​small diameter and an area of ​​conical transition from a small diameter to a large one are formed by crimping the workpiece in the matrix with a punch. The working profile of the matrix has the dimensions of the outer profile of the resulting part. The working profile of the punch is made with the dimensions of the internal profile of the part. Then, an area of ​​a larger diameter of the part is formed by reshaping the remaining tapered part of the workpiece by crimping and pulling through at least one matrix ring with a punch with a working profile having the dimensions of the internal profile of the part.

EFFECT: reduction of the thickness difference of the received parts.

1 cl, 4 dwg