| 摘要 |
PURPOSE:To simplify the manufacture of a lightweight engine valve by filling a slot of a heat-resistant steel block with coring powder, tapping the slot of the block and then defining both a valve stem part and a skirt part thereon. CONSTITUTION:The slot of a heat-resistant steel block 4 is filled with coring powder mix of graphite, carbon, ceramic, etc. After the opening of the block 4 is closed with a tap 8, the hot extrusion is performed on the block 4 to define a valve stem part 12 at one side thereof. The hot press and swaging is performed on the block 4 to define a skirt part 16 at the other side thereof. Subsequently, a tap 17 made of heat-resistant steel is welded at the opening of the slot to tap it. Thus, a lightweight engine valve may be manufactured easily.
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