FIELD: manufacture of branch pipe on hollow cylindrical part at providing equal height of branch pipe along its perimeter and increased height of its wall. SUBSTANCE: method comprises steps of making in article convex-concave opening with four bending points; expanding concave curvilinear portions of walls of opening until imparting convex shape to them by means of deforming tool having cone, ellipse and rectangular working surfaces. EFFECT: elimination of height difference of branch pipe along its perimeter and increased height of branch pipe. 5 dwg
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