US 12,403,518 B2
Method and arrangement for producing a hardened sheet metal product
Jan Jäderberg, Spånga (SE); and Jörgen Brandt, Åhus (SE)
Assigned to TC TECH SWEDEN AB, (SE)
Filed by TCTECH SWEDEN AB, Spånga (SE)
Filed on Mar. 15, 2024, as Appl. No. 18/606,020.
Application 18/606,020 is a continuation of application No. 16/476,933, abandoned, previously published as PCT/SE2018/050001, filed on Jan. 2, 2018.
Claims priority of application No. 1750017-4 (SE), filed on Jan. 11, 2017.
Prior Publication US 2024/0261842 A1, Aug. 8, 2024
Int. Cl. B21D 22/02 (2006.01); C21D 1/42 (2006.01); C21D 1/673 (2006.01); H05B 6/36 (2006.01); H05B 6/40 (2006.01)
CPC B21D 22/022 (2013.01) [C21D 1/42 (2013.01); C21D 1/673 (2013.01); H05B 6/365 (2013.01); H05B 6/40 (2013.01); C21D 2221/10 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A method for producing a hardened sheet metal product, the method comprising:
placing a sheet metal piece in a heating station;
heating selected areas of the sheet metal piece in the heating station by means of induction;
wherein a coil induces currents that flow in a front metal layer on a front side of the coil,
wherein first and second opposing ends of the front metal layer are interconnected by a short-circuiting arrangement running on a rear side of the coil, the short-circuiting arrangement comprising a material with lower resistivity than the front metal layer,
wherein a thermally insulating layer is placed beneath the front metal layer, and
wherein inlays are located in the thermally insulating layer beneath the front metal layer, locally diverting the electric current from the front metal layer which by conveying magnetic flows or electric currents reduce the development of heat in the front metal layer in a pattern thereon;
moving the heated sheet metal piece to a pressing station; and
pressing the sheet metal piece while cooling said heated areas.