| 摘要 |
PURPOSE:To tear and widen an end face easily and to make it possible to make the working to a shape T or shape I by using a wedge-shaped tool and also by lowering the yield stress of a metallic material by conducting electricity and heating a metallic material when both end faces of a metallic material are teared and formed to a shape T or shape I. CONSTITUTION:A wedge-shaped roller 20, 22 for tearing work is arranged on the upper end surface and lower end surface of a metallic material 10 and electricity is conducted via these both rollers and by heating the metallic material 10 to 450-750 deg.C with its resistance heat the yield stress is lowered. Simultaneously the upper and lower end faces are teared by pressing to the upper end 12 and lower endface 13 the both tearing rollers 20, 22 with their rotation by a driving shaft 16. A forming roller 24, 26 and 28, 30 is then arranged on the upper and lower teared faces and both side faces of the material 10 and working is performed to long-sized material 32 having T-shaped or I-shaped section with the rolling of these rollers. This shape material 32 is made to a product by correcting to the prescribed size with a correcting device. |
