To provide a method for manufacturing a cylinder sleeve capable of improving the shape precision of the cylinder sleeve made of aluminum alloy, which is made from raw material powder as a starting material, without lowering productivity nor increasing manufacturing cost.
Raw material powder is pressed and the resulting ring-like compact 10 is filled into a cavity of a die 7 composed of a lower 1 and a lower 2 punch 1, 2, an upper 1 and an upper 2 punch 3, 4, a core 5 and a die 6, and back pressure is applied to the compact to solidify the tip portion of extrusion of the compact 10. The compact is downwardly extruded from a ring-like gap 9 between the lower 2 punch 2 and the core 5 by lowering the lower 1 punch 1 preferably at an extrusion ratio of 10 or more to obtain a single cylinder sleeve 20.
KAJI TOSHIHIKO
Torii Kazuhisa
Takayoshi Tagawa
Higashio Masahiro
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