| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method of drawing a steel product and a die device for drawing a steel product adapted to allow inhibiting variation in outer diameters of steel products from the initial stage of startup of the drawing process to achieve stabilization in sizes of outer diameters of the steel products. <P>SOLUTION: The method of drawing a steel product employs a die device 1 for drawing a steel product adapted to hold a die 2 for a drawing process with a die hole 20 that permits the steel product to pass along its longitudinal direction. A drawing process is implemented to draw the steel product by making it pass through the die hole 20 of the die 2. In advance of starting up drawing of the steel product with the die 2, the die 2 is heated up by a heat source 7 to raise the temperature of the die 2 to a temperature region of the die 2 during the drawing process, or a temperature region as high as 70 to 100% with respect to the temperature region of the die 2 during the drawing process. After the temperature-raising operation, the drawing process of the steel product is started. <P>COPYRIGHT: (C)2013,JPO&INPIT |
