| 摘要 |
PROBLEM TO BE SOLVED: To continuously manufacture an extruded material at a low cost even in the case of an extruded material with high extrusion ratio and small cross section by specifying a die temperature, a billet temperature, a container temperature, and a dummy block temperature as a specific temperature range. SOLUTION: A column-like billet 4 composed of aluminum or aluminum alloy is inserted into a container 1, and an extrusion pressure is applied by a stem 3 via a dummy block 5, so that the billet 4 is extrusion molded into a shaped material with a given cross section shape by means of a die 2. At that time, it is preferable that temperature of the die 2 is 500-540 deg.C, the temperature of the billet 4 is 530-565 deg.C, the temperature of the container 1 is 480-500 deg.C and the temperature of the dummy block 5 is 300-400 deg.C. After the die 2 is preheated to the above-mentioned temperature range, it is attached to an extrusion processing machine. Then, a heat source is heated and held to a container temperature in a billet temperature and a processing heat at the time of protrusion molding, and is preheated to a dummy block temperature, whereby the die temperature is maintained in a given range so as to enable continuous production.
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