Metal tools and implements – making – Blank or process
Patent
1974-06-24
1976-05-11
Hinson, Harrison L.
Metal tools and implements, making
Blank or process
29 95R, B26D 100, B21K 2100
Patent
active
039554465
ABSTRACT:
A cutting tool made of a material having a high red hardness for the continuous machining of metals and having a geometry determined by the change in measurements of a sample of the metal being machined when the sample is externally loaded to failure. The sample is subjected to a tensile load to produce the failure. Elongation and neck down are caused in the failure area according to the ductility of the metal. The effective cutting or rake angle of the cutting tool is established as a function of the elongation and neck down of the sample. The relief angles of the cutting tool geometry are determined to maintain a self-sharpening cutting edge under the abrasive characteristics of the workpiece material and erosion characteristics of the cutting tool material for given machining conditions.
The effective rake angle of the cutting tool is also established as the minimum angle producing chips of maximum hardness during the machining operation.
REFERENCES:
patent: 2164303 (1939-07-01), Berg et al.
Article by Mark W. Purser-- Bearing Lands and Negative Rakes----from American Machinist, Aug. 2, 1945, pp. 118-121.
Hinson Harrison L.
O'Fallon Investment Company
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