PURPOSE: To manufacture by extrusion the shape whose cross sectional shape is varied in the longitudinal direction by taking in and out a partition plate from a side of a die, and varying thickness or width of the shape of at least a part of the side of a die hole.
CONSTITUTION: By allowing a billet 11 to pass through a hole 7 of a die 6, a product 11' is extruded. In this case, by installing partition plates 9, 9' on the die 6, so that they can be taken in and out freely in the vertical direction, a shape of a die outlet hole is varied in the course of extrusion. For instance, when the partition plates 9, 9' are pushed in first and extruded, and drawn out, width of a flange can be widened continuously. In such a way, the shape in which width of the flange of a product is varied in the longitudinal direction is obtained. Since it is constituted integrally, it is excellent in strength and a fatigue characteristic, and the product whose reliability of quality is high is obtained.
TODA MASAHIRO
KADA OSAMU
KURIYAMA YUKIHISA
| JPH0531527A | 1993-02-09 |