Metal deforming – By use of tool acting during relative rotation between tool... – With modification or control of temperature of work – tool or...
Patent
1982-02-08
1984-01-31
Larson, Lowell A.
Metal deforming
By use of tool acting during relative rotation between tool...
With modification or control of temperature of work, tool or...
72 71, 72325, B21D 2836
Patent
active
044282141
ABSTRACT:
A flow drilling tool including a blunt-ended prepunch portion for punching a circular slug from the workpiece as the tool is rotated and moved axially with respect to the workpiece. Thereafter, a circular forming portion is rotated in contact with the workpiece to increase the length and diameter of the punched hole. The prepunch permits formation of a rimmed hole in a single step by eliminating predrilling. Variations and irregularities in the length and thickness of the rim portion surrounding the hole are reduced, and ragged tapered surfaces on the rim portion are eliminated. The axial location of the hole relative to the workpiece is controlled by adjusting the speed of rotation of the tool and the axial pressure of the tool against the workpiece, and by preheating the workpiece.
REFERENCES:
patent: 1675910 (1928-07-01), Riker
patent: 1813152 (1931-07-01), Enghauser
patent: 1906953 (1933-05-01), Enghauser
patent: 2991551 (1961-07-01), Fogle et al.
patent: 3429171 (1969-02-01), Feher
patent: 3939683 (1976-02-01), van Geffen
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patent: 4175413 (1979-11-01), van Geffen
patent: 4177659 (1979-12-01), van Geffen
patent: 4185486 (1980-01-01), van Geffen
"Machine and Tool Blue Book", Oct. 1979, Make Holes and Bushings in One Operation. (pp. 116-121).
Bredesky, Jr. Louis P.
Head, Jr. Glenn D.
Le Master William C.
Winter David C.
Deere & Company
Larson Lowell A.
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