Title:
RESISTANCE ANNEALING FURNACE FOR ANNEALING A METAL WIRE, STRAND, STRING, WIRE ROD OR STRAP
Document Type and Number:
WIPO Patent Application WO/2015/063748
Kind Code:
A3
Abstract:
A resistance annealing furnace for annealing a metal wire, strand, string, wire rod or strap having at least two electric axes (5-7), which are provided with respective pulleys (8-10) for conveying the metal wire (2), and DC voltage generator means (14) suppliable by an AC voltage source (15) to generate an annealing voltage (Uann) applied between the two electric axes (5-7). The DC voltage generator means (14) has a first voltage rectifier stage (19) connectable to the AC voltage source (15) to generate an intermediate DC voltage (Udc), an active power filter (23), connected so as to compensate the current harmonics at the input of the first voltage rectifier stage (19), a pulse width modulator (20) to transform the intermediate voltage (Udc) into a first PWM voltage (Uml), a voltage transformer (21) to transform the first PWM voltage (Uml) into a corresponding second PWM voltage (Um2), and second voltage rectifier means (22) to transform the second modulated PWM voltage (Um2) into the annealing voltage (Uann).
Inventors:
AFFATICATI ARTEMIO (IT)
CONTE ROBERTO (IT)
CONTE ROBERTO (IT)
Application Number:
PCT/IB2014/065796
Publication Date:
July 23, 2015
Filing Date:
November 04, 2014
Export Citation:
Assignee:
SAMP SPA CON UNICO SOCIO (IT)
International Classes:
C21D9/56; C21D9/62; F27D11/04; F27D19/00; H05B3/00
Domestic Patent References:
| WO2013136772A1 | 2013-09-19 |
Foreign References:
| US3842239A | 1974-10-15 | |||
| EP0779370A1 | 1997-06-18 | |||
| US5700335A | 1997-12-23 | |||
| JP2001335846A | 2001-12-04 | |||
| JPH10298669A | 1998-11-10 |
Attorney, Agent or Firm:
BOGGIO, Luigi et al. (Via Viotti 9, Torino, IT)
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