System for planishing metal pipe
AssigneeGrotnes Metalforming Systems, Inc.
InventorsLaszlo J. Javorik, Vernon R. Fencl
Life of this patent
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Abstract
Metal pipe is planished by passing it longitudinally between two concentric circular arrays of independently rotatable planishing elements which are urged against the inner and outer surfaces of the pipe. The two circular arrays of planishing elements are radially aligned with each other on opposite sides of the pipe wall, and the pipe is rotated relative to the two arrays of planishing elements while the pipe is being passed therebetween.
Claims2
A method of treating metal pipe to improve its strength, corrosion resistance and surface smoothness, said method comprising the steps of passing the pipe longitudinally between two concentric circular arrays of independently rotatable planishing element which are urged against the inner and outer surfaces of the pipe at a pressure sufficient to work the surface of the pipe, said independently rotatable planishing elements comprising steel balls which are supported to permit independent rotation of each ball in any direction about its center, the two circular arrays of planishing elements being radially aligned with each other on opposite sides of the pipe wall, and rotating said pipe relative to said two circular arrays of planishing elements while the pipe is being passed therebetween and while said planishing elements are being urged against the inner and outer surfaces of the pipe.
Dependencies are inferred from the claim text.