| 摘要 |
PURPOSE:To eliminate perfectly the generation of an insufficiently recrystallizing part in the central part of a product, by providing a flow shunting plate to the front side of a product-extrusion die hole, and extruding a product material while allowing it to reexpand after once reducing the material by shunting its flow, in a conforming extrusion. CONSTITUTION:In extruding a round wire rod from powder or granule, a starting material is once introduced into the 1st pressure chamber. Next, the material is introduced to expand in the 2nd pressure chamber 3 after reducing it by shunting its flow by means of the holes 2a of a flow shunting plate 2. The shunted material welds together again in the 2nd pressure chamber 3 by the temperature and pressure in the chamber 3, and is extruded from the hole of a die 4. Thus the material is well mixed in the chamber 3, and recrystallization is perfectly performed to the central part of a product. |
