| 摘要 |
PURPOSE:To manufacture a special-shaped pipe excellent in accuracy of positioning holes and good shape by using a composite billet bored holes parallel to the longitudinal direction of a columnar billet and packed with a glass powder in the holes. CONSTITUTION:The composite billet 3 is formed by boring in the longitudinal direction of the columnar billet 1 and by packing the glass powder in the holes. Then, this billet is heated to insert into a container 5, passed through a die 7 by a stem 6 to work a hot extrusion working, then the glass is removed from the extruded material 8. When the composite billet 3 packed with the glass powder is heated and the hot extrusion working is performed, the glass is fluidized, and resisting the deforming pressure of the billet, the extruded material 8 packed uniformly with the glass in the longitudinal direction is obtained. In order to remove the glass from the extruded material 8, both ends of the material 8 are opened to press inside the holes while the glass is fluidized.
|
