Metal deforming – With cutting – By composite tool
Patent
1974-08-28
1976-01-20
Larson, Lowell A.
Metal deforming
With cutting
By composite tool
B21D 2824
Patent
active
039330214
ABSTRACT:
The problem of producing small openings in a relatively thick wall, such as a pipe wall of a working cylinder of a shock absorber, is solved in accordance with the invention by placing the wall on a die with an opening that is the same or substantially the same as the opening that is to be produced, and forcefully penetrating the wall with the conical tip of a tool aligned with the die opening, the depth of penetration corresponding substantially to the thickness of the wall at the point of penetration. This forces part of the material of the wall into the die opening, and, upon further penetration to approximately the thickness of the wall, the material forced into the die opening is sheared off at the edge of the die opening, such that the sheared material can detach from the wall before the conical tip is seated in the die opening. Openings produced successively in this manner are almost identical, and the operation does not leave burrs, the wall face which was lying against the die remaining smooth.
REFERENCES:
patent: 68187 (1867-08-01), Hamilton
patent: 2145725 (1939-01-01), Jamieson
patent: 2478962 (1949-10-01), Ziehmer, Jr.
patent: 3044167 (1962-07-01), Mathieu
patent: 3698274 (1972-10-01), Coulon et al.
Reese Burkhart
Schick Lothar
Boge GmbH
Larson Lowell A.
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