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    • 6. 发明专利
    • DE102007036234A1
    • 2009-02-05
    • DE102007036234
    • 2007-08-02
    • MAHLE INT GMBH
    • FEDYNA ACHIMSCHNAITMANN GOTTFRIED
    • B23P15/10F02F3/16
    • A device for machining and assembling a piston, comprising, a piston upper part; and a piston lower part; an upper work spindle and a lower work spindle, wherein the upper and lower work spindles are arranged coaxially to one another and are at least one of -actuated independently of one another and actuated together, such that one work spindle supports the piston upper part and the other work spindle supports the piston lower part; and a first and second tool carriage, wherein the tool carriages are actuated independently of one another, such that one tool carriage supports a tool for machining the piston upper part and the other tool carriage supports a tool for machining the piston lower part, wherein the device is configured such that both of the piston upper and lower parts are machined independently of one another, aligned with regard to one another, and joined to one another such that the piston parts remain clamped to the tool carriages in the interim.
    • 7. 发明专利
    • DE102007054736A1
    • 2009-05-20
    • DE102007054736
    • 2007-11-16
    • MAHLE INT GMBH
    • FEDYNA ACHIMPESCHKE CHRISTIAN
    • C21D1/09
    • A method for hardening groove walls of the ring groove of a steel piston by a laser beam consists of conducting process gas that contains oxygen onto a groove wall of the steel piston, and putting the steel piston into rotation. The groove wall is irradiated with the laser beam until an oxide layer has formed on the groove wall. Subsequently, the feed of the process gas is turned off, and the groove wall is heated and hardened, in tracks. The degree of heat conductivity of the groove wall is improved by the oxide layer on the groove wall, thereby bringing about faster heating and hardening of the groove wall. The reflectivity of the groove wall is also reduced in this way, so that only little light is reflected by the groove wall onto other regions of the groove, so that these regions are not unintentionally heated and hardened.