METHOD OF MULTIOPERATIONAL PRESSING OF COMPLEX LARGE MACHINE PART WITH INTERNAL CAVITY ON WALL MADE OF SHEET MATERIAL (VERSIONS) Russian patent published in 2009 - IPC B21D22/20 

FIELD: metallurgy.

SUBSTANCE: invention concerns metal forming field. Particularly it will allow production of complex large-dimensioned seamless sheet metal with concave or convex internal cavity on detail wall. Detail is produced by means of two main shape modifying operations of draw-forming and bending. During the draw-forming process from felled and bended blank it is received semi-finished material with finally founded internal cavities, corresponding to internal cavities at detail wall. There are implemented trimming and the second main shape modifying operation of bending for semi-finished material convolution. For providing of more accuracy according to the second version after semi-finished material convolution into completed part it is implemented its flattening.

EFFECT: fatigue strength increasing, corrosion resistance and accuracy of detail, reduction of sheet material rate of application per one detail, labour coefficient and self-cost.

3 cl, 8 dwg