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AssigneeIndustrial Technology Research Institute
InventorsYuan-Chang Fann, Bee-Yu Wei, Jeng-Maw Chiou
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A two-step two-piece high-pressure casting process for the fabrication of a scroll member containing a generally circular end plate, a scroll hub on one side of the end plate and an involute wrap on the other side thereof. The involute wrap is pre-fabricated from a wear-resistant alloy or aluminum alloy based composite having low liquidus temperature which is placed inside the involute groove of a scroll mold. The scroll mold contains a mobile scroll mold and a stationary scroll mold. The mobile scroll mold contains a first cavity having the shape of the scroll hub; whereas the stationary scroll mold contains a second cavity having the shape of the circular end plate and an involute groove disposed below the second cavity. A molten aluminum alloy or aluminum alloy based composite is injected into the first and second mold cavities which, after solidifies, becomes the scroll hub and the end plate is respective positions whereby a metallurgical bonding will be developed between the end plate and the involute wrap to ensure the integrity of the scroll member. The involute groove has a depth shorter than the height of the involute wrap to increase the area of metallurgical bonding between the end plate and the involute wrap.
A process for fabricating a scroll member for use in a scroll-type fluid displacement device, said scroll member comprising an end plate, an involute wrap on one side thereof and a scroll hub on the other side, said wrap having a pre-determined height and a pre-determined thickness, said process comprising the steps of:
Dependencies are inferred from the claim text.