| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a manufacturing method of a piston for a compressor capable of manufacturing a hollow piston by easy and inexpensive forging, and capable of approaching the position of the center of gravity to an axis of a cylinder part. <P>SOLUTION: This is the method for manufacturing the hollow piston for the compressor by connecting a rotation preventing side member wherein a rotation preventing part and the cylinder part are integrally formed and a piston top part side member. When forming the rotation preventing part side member, an intermediate blank for forging the rotation preventing part side member is formed, and the cylinder part of the rotation preventing part side member is forged and molded in one axial direction by backward extrusion molding for extruding the cylinder part backward of a punch insertion direction with the usage of a punch having an end formed to have a non-symmetrical shape with respect to a piston shaft, and a thinned part along the non-symmetrical shape of a punch end is formed on a rotation preventing part side bottom part of a hollow part forming the cylinder part. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
