METHOD OF OBTAINING A KEYED JOINT Russian patent published in 2023 - IPC F16B3/00 B23P11/00 B24B39/00 

FIELD: production of a keyed joint.

SUBSTANCE: first, upsetting and subsequent smoothing are carried out with electrode tools, the trajectories of which coincide. Grooves are obtained with protrusions in the side surfaces along the keyway at a distance of 1.5-4 mm from the groove to the bottom of the groove. The minimum value of the specified distance is greater than the size of the key bevel by 0.9 mm. Then, the key is installed in the keyway and electromechanical upsetting of the metal of the keyways is carried out with two electrode tools located at an angle of 46-50° to the vertical plane.

EFFECT: efficiency of upsetting and expansion of the upper parts of the keyways is improved, and the gaps in the lower side parts of the keyway are also eliminated.

1 cl, 3 dwg