METHOD OF MAKING FLUSH JOINT Russian patent published in 1994 - IPC

FIELD: metal working. SUBSTANCE: first, holes are made in parts. Hole in part made of homogeneous metal shall have cavity for manufactured head of rivet. Depth of this cavity exceeds height of manufactured head of rivet. Rivet is inserted in hole and is fixed by side surface of manufactured head. Located on rivet shank are other parts of stack and packing washer. Point of rivet is formed in two stages. In fixing the rivet, its manufactured head is additionally fixed by end surface by means of plastic compression of material of part over perimeter of cavity for manufactured head forming strengthened layer whose thickness is determined by relationship given in description. EFFECT: high strength and tightness of load-bearing points and extended technological capabilities. 5 dwg