| 摘要 |
PURPOSE:To eliminate annealing and relubrication treatment and reduce manufacturing cost, by straightening a pipe or bar material continuously and in sequence, directly after its cold drawing, at the temperature higher than its transition temperature of brittleness. CONSTITUTION:When a material is drawn through a die, the temperature of the material rises due to a working heat, resulting from the deformation of the material and the friction between the material and tools, to the temperature higher than its transition temperature of brittleness. Accordingly, when the drawn material is straightened continuously in sequence directly after its drawing, the processing is performed naturally in the temperature region higher than its transition temperature of brittleness, and the annealing and relubrication treatment of the material can be eliminated. |
