Metal working – Method of mechanical manufacture – Combined manufacture including applying or shaping of fluent...
Patent
1975-01-22
1977-02-22
Lanham, C.W.
Metal working
Method of mechanical manufacture
Combined manufacture including applying or shaping of fluent...
249 56, 249 57, 164122, 188251M, 192107T, 192113A, 188218R, B22D 11126, F16D 6510
Patent
active
040085171
ABSTRACT:
A method of manufacturing a brake drum having a plurality of axially spaced, circumferentially extending ribs provided on the exterior surface thereof. The method includes casting molten grey iron into a mold cavity formed by a plurality of axially split external mold segments spaced radially outward from an internal mold member, spacing the radially inward portions of the interfacing lateral edge surfaces of the external mold segments to form a flash base free of white iron metal at the parting line between adjacent external mold segments and, after cooling the molten iron and removing the mold members, grinding away at least a portion of the flash metal formed between the interfacing lateral edge surfaces of the external mold segments radially outward of the flash base to provide an axially extending ridge free of white iron and traversing the axially spaced ribs.
A brake drum having a plurality of radially extending, heat radiating projections formed on the exterior surface thereof including a plurality of circumferentially spaced sets of helical fins with each successive set of helical fins being disposed at a helical orientation opposite to the helical orientation of the preceding set of helical fins to induce a flow of cooling air over the external surface of the brake drum regardless of the direction of rotation of the brake drum.
REFERENCES:
patent: 1865311 (1932-06-01), Goostray
patent: 2059170 (1936-10-01), Farr
patent: 2266723 (1941-12-01), Fahlman
patent: 3417462 (1968-12-01), McClelland
Fisher Frank H.
Schrader Carl N.
Lanham C.W.
Rising V. K.
Rockwell International Corporation
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