RESISTANCE ANNEALING FURNACE FOR ANNEALING A METAL WIRE, STRAND, STRING, WIRE ROD OR STRAP

WIPO Patent Application WO/2015/063749

A3

A resistance annealing furnace for annealing a metal wire, strand, string, wire rod or strap having at least two electric axes (5-7) provided with respective pulleys (8-10) to convey the metal wire (2) and a DC voltage generator (14) suppliable with an AC voltage (Uac) to generate an annealing voltage (Uann) applied between the two electric axes (5-7) so as to provoke the annealing due to Joule effect. The DC voltage generator (14) has active supplying means (19) supplied with the AC voltage (Uac) so as to generate an intermediate DC voltage (Udc), a pulse width modulator (20) to transform the intermediate voltage (Udc) into a first PWM voltage (Um1) with the same amplitude, a voltage transformer (21) to transform the first PWM voltage (Um1) into a second PWM voltage (Um2) with a smaller amplitude, and a voltage rectifier stage (22) to transform the second PWM voltage (Um2) into the annealing voltage (Uann).

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AFFATICATI ARTEMIO (IT)
CONTE ROBETO (IT)

PCT/IB2014/065798

July 23, 2015

November 04, 2014

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SAMP SPA CON UNICO SOCIO (IT)

C21D9/56; C21D9/62; F27D11/04; F27D19/00; H05B3/00

WO2013136772A1

2013-09-19

US3842239A	1974-10-15
US5700335A	1997-12-23
EP0779370A1	1997-06-18
JP2001335846A	2001-12-04
JPH06184649A	1994-07-05

See also references of EP 3066225A2

BOGGIO, Luigi et al. (Via Viotti 9, Torino, IT)

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