Manufacturing method for hollow engine valve


PURPOSE: To manufacture a vacant valve easily by inserting a core bar containing a mandrel through the center thereof into the slot of a block, forming a valve and pulling off the mandrel from the valve. CONSTITUTION: A core bar 8 which contains a mandrel 7 made of high-tensile alloy through the center, and is made of the mixture of graphite and ceramics powder is inserted into the slot 3 of a heat-resistant steel block 4. The block 4 is subjected to the forward hot extrusion to define a stem part 11 on the block and then subjected to the hot press and the swaging to define a skirt part 15. The mandrel 7 is then pulled out from the block 4 and the core bar 8 is removed, whereby defining a hollow part 16. Thus, a vacant valve can be shaped easily. COPYRIGHT: (C)1988,JPO&Japio




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Cited By (4)

    Publication numberPublication dateAssigneeTitle
    EP-0619419-A1October 12, 1994Eaton CorporationSoupape pour moteur ultra légère
    JP-H0399741-AApril 24, 1991Mercedes Benz AgProduction of valve
    JP-H0520182-B2March 18, 1993Daimler Benz Ag
    US-5413073-AMay 09, 1995Eaton CorporationUltra light engine valve