DEVICE FOR COIL SPRING HARDENING Russian patent published in 2017 - IPC B21F35/00 

FIELD: machine engineering.

SUBSTANCE: device comprises a holder with cylindrical cavity and a core of cylindrical shape coaxially arranged therein. The springs are arranged in cavity between the holder and the core with possibility of spring compression by the core by means of its limited longitudinal movement under force action. The holder is provided with two covers with an axial hole for their temporary fastening on the holder. The core is provided with rods placed in holes of the covers at each side with rods of round cross section with flat-to-flat heads rigidly connected to the core. The cylindrical surfaces of the holder cavity and the core are provided with threaded grooves for receiving coils of the compressed spring.

EFFECT: expanded range of operating means.

3 cl, 9 dwg