| 摘要 |
PROBLEM TO BE SOLVED: To realize backward extrusion molding capable of suppressing molding defect, improving a product precision and improving a yield. SOLUTION: In a backward extrusion molding method in which a material 15 to be worked in a die 3 is pressed by a punch 10, part of the material 15 to be worked is caused to flow out from the clearance part between the die 3 and the punch 10 backward for the pressing direction of the punch 10, the structure, in which the material 15 to be worked flowing to the back of the clearance can be pressed in the pressing direction of the punch 10, is provided. In forging, the material 15 to be worked flowing out backward is pressed, the material 15 to be worked is forged.
|
