WASHER MANUFACTURING METHOD Russian patent published in 2023 - IPC B21K1/76 B21D53/20 

FIELD: metal processing.

SUBSTANCE: processing of metals by pressure used in the manufacture of flat washers used in threaded connections. The billet is preheated to a temperature above the austenitization temperature. In the heated billet, a preliminary recess is formed on one or both sides with a length d, which is 0.7-1.3 from the length D₀ of the washer hole, and a depth h, which is 0.05-0.7 from the thickness H of the washer. The formation of the recess is carried out simultaneously with the draft of the billet to a given thickness H and length D of the washer. Then a hole is punched in the billet.

EFFECT: creating a more processable method for manufacturing a flat washer.

8 cl, 4 dwg, 2 ex