Cutters – for shaping – Rectilinear broach
Patent
1993-06-24
1996-04-02
Kisliuk, Bruce M.
Cutters, for shaping
Rectilinear broach
407 18, 407 19, 29 9001, B23P 1542
Patent
active
055035060
ABSTRACT:
A broaching tool has a plurality of cutting teeth for broaching a small, deep hole with high precision and surface finish. Three to eight teeth are engaged in the hole for cutting at any one time. For broaching sticky metals such as stainless steel, each cutting tooth has a face angle, backoff angle and rise which are sufficiently large to prevent thermal hardening of the hole surface. A ring is provided between the front face and land of each cutting tooth having a width selected to prevent formation of axial and ring-shaped tool traces. V-shaped notches having a large radial angle and a small backoff angle are formed in the land of each cutting tooth to break chips and prevent clogging. The tool further includes a rear pilot having a plurality of smoothing teeth with a diameter larger than the finished diameter of the hole. A set of rough and fine broaching tools can be provided, with the fine tool being processed to convert it to a rough tool when it is worn beyond tolerance. A lubricant/coolant including molybdenum disulfide powder dispersed in a liquid suspension is coated on the tool during broaching.
REFERENCES:
patent: 1935774 (1933-11-01), Halborg
patent: 1945535 (1934-02-01), Schiltz
patent: 2392481 (1946-01-01), Kaplan et al.
patent: 3836467 (1974-09-01), Jones et al.
patent: 4038730 (1977-08-01), Tersch
patent: 4498361 (1985-02-01), Grace
Machine and Tooling, vol. 34, No. 10, Oct. 1963 pp. 32-34, "Broaching Deep Holes in Cast Iron", A. G. Kaleshin et al.
Journal of Tongji University, 1985, "A New Broaching Technology for Drilling Small Deep Precise Holes", Y. Linsen, pp. 117-125.
Denson-Low Wanda K.
Duraiswamy Vijayalakshmi D.
Hughes Aircraft Company
Kisliuk Bruce M.
Morgan Eileen P.
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