PURPOSE: To extrude continuously a high-strength Al alloy material by supplying a previously heat-treated Al alloy blank material which contains Zr to the front end of a conduit formed of a driving and a fixed wall surface.
CONSTITUTION: A friction driving type extruder has the conduit 5 formed of the groove surface 2 of a driving wheel 1 and the internal wall surface 4 of a fixed shoe block 3. The Al alloy blank material 9 containing 0.03W0.6% Zr is supplied to the front end 6 of this conduit 5. This alloy blank material is heat-treated previously at 300W450°C for 10W300hr to deposit and disperse Zr. The alloy blank material 9 is sent to the rear end 7 of the conduit 5 by the friction contact resistance between the groove surface 2 and alloy blank material 9 as the driving wheel 1 rotates and once pressure is applied, the material is heated up to high temperature by the heat of friction against the fixed wall 4. Then, the material is extruded at high temperature with extruding dies 8 to obtain an extruded material 10. This alloy blank material 9 does not soften during the extrusion, so the extruded material 10 has high strength.
YOSHIDA SHIGEAKI
YOKOTA MINORU
MIYAZAKI TAKESHI
