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US 4,512,066 AGranted
Method of fabricating scroll members
AssigneeArthur D. Little, Inc.
InventorJohn E. McCullough
Life of this patent
Estimating the term…
Abstract
Method for forming scroll members comprising an end plate having an involute wrap rigidly affixed thereto. The end plate and involute wrap are precision formed, e.g., by casting, either as an integral element or as two separate elements and then the scroll member is broached to the desired dimensional accuracy and finish. Push broaching is accomplished with an involute broaching tool which has a single terminating cutting edge on one or both sides of an involute blade cutter.
Claims10
A method of fabricating a scroll member comprising the steps of
- (a) providing a precision preformed scroll member as an element having affixed to an end plate an involute wrap having its inner and outer flanks joined to said end plate along the base of said involute wrap;
- (b) forming reentrant corners between the surface of said end plate and said inner and outer flank surfaces joining said involute wrap to said end plate;
- (c) broaching said inner and outer flanks of said involute wrap axially toward the surface of said end plate to attain a predetermined thickness of said involute wrap and a radial spacing between the turns thereof, said reentrant corners providing clearance for chips resulting from said broaching.
Dependencies are inferred from the claim text.