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US 6,463,779 B1Granted
Instant heating process with electric current application to the workpiece for high strength metal forming
OwnerMehmet Terziakininventor
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OwnerMehmet Terziakininventor
Estimating the term…
A process and relevant tools for hot forming of high strength metal workpieces by means of applicating high density current to the workpiece directly and generating heat inside it by using its own electrical resistance in order to obtain desired temperature and formability at the desired moment of the forming process without requiring any external heat source or previous heating process. Temperature of the blank is measured by measuring its electrical resistance and by using linear correlation between temperature and resistance. This heating process can be applicated in several metal forming types such as high strength sheet stamping (FIG. 2, FIG. 3), bending (FIG. 3), blow forming (FIG. 4, FIG. 5) in accordance with mechanical operations of the relevant processes. High temperature rates can easily be reached and kept at the desired moment of the forming process without being effected by rapid cooling phenomena resulted by too much heat loss area/mass and heat storage capasitance of thin sheets. Ceramic tools and dies are available in these process offering electrical nonconductivity, thermal low conductivity and durability against heat. Cooling process of the formed workpiece between dies under pressure provides dimentional accuracy and increased yield strength resulted by regular elongation effect and rapid temperature decrease.
A process for forming sheet metal workpieces before which at least two electrode sets placed on two opposite edges of said sheet that is electrically isolated from whole mechanical forming apparatus including dies which are situated at two opposite sides of said blank sheet, the process including;
A process for hot bending sheet metal workpieces performed between at least two electrode sets placed on two opposite sides of a bending line of the blank sheet with a certain spacing among said electrodes, the process including:
An apparatus for hot forming process for sheet metal workpieces pre-heated by direct electric curret application between at least two electrode sets placed on two opposite edges of said sheet, the apparatus including:
Dependencies are inferred from the claim text.