| 摘要 |
PROBLEM TO BE SOLVED: To prevent the defect of size of products and the generation of breaking at the corner portion and thin wall portions of holed patterns and to prolong the life of dies particularly in extruding shaped materials with complicated cross sectional shape. SOLUTION: The groove 2f which becomes to a lubricant stagnating portion is formed between holed pattern inner surface 2d and 2e, by overlapping a front die 2a and a rear die 2b whose holed patterns are similar to each other. Due to the lubricant stagnating portion, the generation of the seizure and crack on the surface of the products due to the lack of supplying the lubricant can be prevented and the life of the dies are prolonged. By making the angle of the holed patternθ20°or more to sufficiently supply the lubricant to the dies holed pattern, the surface flaw of the products can be prevented, further, by making the angle of the holed patternθ60°or less to prevent the deformation of the dies due to the extremely great surface pressure acting on the dies, the generation of the defects of product size can be prevented. Additionally, the production cost can be reduced, because the production becomes easy by making the die structure a separate structure comprising the front and rear die 2a and 2b. COPYRIGHT: (C)2004,JPO
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