Method of hot bending a generally straight wire blank

Details Method of hot bending a generally straight wire blank Method of hot bending a generally straight wire blank

1977-08-26

1979-11-20

Kucia, Richard R.

Electric heating

Metal heating

With forging or shaping

219154, 219156, B21F 3027

Patent

active

041752287

ABSTRACT:
A method of hot bending a generally straight wire blank of a material being brittle in cold condition into a wire element having straight end portions and coils formed therebetween. According to the invention the rod blank is hot bent without a mandrel by clamping the end portions of the rod blank by means of two clamping jaws. The rod blank is heated to a softening temperature in the central wire portion which is to form the coils of the finished wire element, while the end portions are kept at a lower temperature. During the bending process at least one of the clamping jaws is brought along a movement path adapted to the desired coil formation.

REFERENCES:
patent: 458115 (1891-08-01), Thomson
patent: 475181 (1892-05-01), Burton
patent: 1541924 (1925-06-01), d'Adrian
patent: 3812324 (1974-05-01), Faffaelli

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