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US 2009/0169911 A1Published application
Extrusion-molded hollow material, and apparatus and method for molding same
AssigneeKabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)
InventorAkira Sakae
Life of this patent
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Abstract
An extruded hollow section that can be fabricated in fewer production man-hours, and furthermore, is stable in quality. With the extruded hollow section, parallel parts each having a width in one direction within a section vertical to the direction of extrusion, being constant along the direction of extrusion, are integrally formed with tilt parts each having a width in the one direction, varying along the direction of the extrusion, wherein the parallel parts are integrally formed with the tilt parts. The extruded hollow section is made of a light metal.
Claims9
1:
- An extruded hollow section formed in a hollow shape by extrusion, comprising:
- parallel parts each having a width in one direction within a section vertical to a direction of extrusion, being constant along the direction of the extrusion;
- and
- tilt parts each having a width in the one direction, varying along the direction of the extrusion,
- wherein the parallel parts are integrally formed with the tilt parts.
2 more elements
2:
- The extruded hollow section according to claim 1, wherein the parallel parts and the tilt parts are alternately formed along the direction of the extrusion.
3:
- The extruded hollow section according to claim 1, wherein the tilt parts each are formed in a shape symmetrical with respect to a plane containing an axis extending in the direction of extrusion.
4:
- The extruded hollow section according to claim 1, wherein the tilt parts each are formed in a shape asymmetrical with respect to a plane containing an axis extending in the direction of extrusion.
5:
- The extruded hollow section according to claim 1, made of a light metal.
6:
- A forming apparatus for forming the extruded hollow section according to claim 1, said forming apparatus comprising:
- a fixed die provided with a forming hole having guide grooves extending in a direction tilting against a direction of extrusion;
- and
- movable dies disposed so as to be able to travel along the guide grooves, respectively,
- wherein the fixed die has a base part provided so as to bridge between inner faces of the forming hole, and a hole forming part extended from an end of the base part, on a downstream side thereof, toward downstream inside the forming hole, and
- wherein the movable dies are disposed inside the forming hole with a gap remaining between the hole forming part, and each of the movable dies.
3 more elements
7:
- The forming apparatus for forming the extruded hollow section, according to claim 6, wherein the forming hole has a pair of planes opposing each other, parallel with the direction of the extrusion, and the respective guide grooves extend in the direction tilting against the direction of the extrusion, over the planes opposing each other.
8:
- A method for forming the extruded hollow section according to claim 1, using a forming apparatus comprising a fixed die provided with a forming hole having guide grooves extending in a direction tilting against a direction of extrusion, and movable dies disposed so as to be able to travel along the guide grooves, respectively, wherein the fixed die has a base part provided so as to bridge between inner faces of the forming hole, and a hole forming part extended from an end of the base part, on a downstream side thereof, toward downstream inside the forming hole, said method comprising the steps of:
- extruding the parallel parts with the movable dies as-stopped state;
- and
- extruding the tilt parts while causing the movable dies to travel along the guide grooves, respectively.
1 more element
9:
- The method for forming the extruded hollow section, according to claim 8, wherein a ratio of change in width along the direction of extrusion is changed by varying traveling speeds of the respective movable dies.