METHOD FOR PRODUCTION OF SHELL Russian patent published in 2010 - IPC B21D26/02 B23K20/14 

FIELD: technological processes.

SUBSTANCE: invention may be used to manufacture shells from sheet billets of titanium alloy by superplastic moulding. Sheet billets are assembled in packet with account of rolling direction in them. Each half of packet is assembled from at least two sheet billets, which are installed one versus another with arrangement of angle between directions of rolling in them. Sheet billets are combined in each half of packet by means of pressure welding. Connection of billets in packet is realised by welding along perimetre. Forming of produced billet is executed by pressure of working medium generated in cavity of packet produced by its halves. In a particular case of method realisation, in process of each packet half assembly, between billets, having larger grain size, billets are arranged, which have smaller grain size, besides welding temperature is selected taking into account billets with smaller grain size. Billet having smaller grain size is preferably arranged to produce internal surface of shell. Connection of billets in both halves of packet may be executed simultaneously, for this purpose gasket is inserted between packet halves with anti-welding coating applied on it on both sides, for instance on the basis of boron nitride, and after connection of billets gasket is removed.

EFFECT: reduction of rolled sheet metal anisotropy impact at shell quality.

7 cl, 7 dwg, 1 tbl, 3 ex