Metal deforming – With means to drive tool – Including magnet – solenoid or explosive
Patent
1977-12-19
1978-12-12
Lanham, C.W.
Metal deforming
With means to drive tool
Including magnet, solenoid or explosive
2924354, B21J 730
Patent
active
041290283
ABSTRACT:
A method and apparatus therefor using the stress wave phenomenon for sizing and working a hole in a workpiece. A mandrel of the desired size, shape, and finish is "driven" into the hole by a stress wave to work the hole and impart thereto a desired shape, size, and finish. Electromagnetic means are used to generate the stress wave whose characteristics are such that it can be propagated through the mandrel and into the workpiece with a pulse energy level, rise rate, and duration sufficient to put the material in the walls of the hole into a condition of plastic flow so that a permanent deformation thereof conforming to the working area of the mandrel is achieved. A straight or a tapered hole can be worked or a straight hole can be converted into a tapered hole having the desired final shape, size, and finish. In a further embodiment, the mandrel used in the method can be the fastener for which the hole has been drilled. If required, more than one stress wave pulse can be used to achieve the desired working of the hole.
REFERENCES:
patent: 2806328 (1957-09-01), Bradfield
patent: 3201967 (1965-08-01), Balamuth
patent: 3224086 (1965-12-01), Balamuth
patent: 3609851 (1971-10-01), McMaster
patent: 3646791 (1972-03-01), Leftheris
patent: 3731370 (1973-05-01), Leftheris
patent: 3824824 (1974-07-01), Leftheris
patent: 3892121 (1975-07-01), Champoux
patent: 3945109 (1976-03-01), Leftheris
Leftheris Basil P.
Mainhardt Joseph H.
Schwenk Walter
Crosby Gene P.
Gill Mellor A.
Grumman Aerospace Corporation
Lanham C.W.
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