Usx Corporation

Miles Gerald Sanderson

John F McDermott

Jerry Hann

Yoni Adonyi

Mark Stewart Seeler

Paul M Albritton

William Russell Anderson

The present invention is of a mandrel bar assembly for a seamless pipe mill. The assembly includes a pair of tooling sections each having a tapered end, a reduced diameter portion axially inward of the tapered end adapted to be gripped by a retaining means of the mill, and a working portion adjacent the reduced diameter portion extending from the reduced diameter portion to the end opposite the tapered portion. The assembly includes a coupling for connecting the tooling sections together end-to-end with the tapered ends facing oppositely outward therefrom. An adapter is provided to cover the reduced diameter portion and provide a working surface thereon of one tooling section that is to be positioned as the lead end into the mill. When one tooling section wears the adapter can be removed and installed on the other tooling section, and the assembly is reversed end-to-end to use the other tooling section as the lead end, extending the useful life of the assembly.

Reversible mandrel bar assembly

In the fabricating of a mandrel bar, a plurality of used mandrel bar segments are provided, each of which has a central bore comprising a smooth surface portion and a threaded portion. Each segment has a circumferential recess at an end thereof and a bevelled surface adjoining the recess and extending inwardly of the segment at an angle to the vertical. A coupling has a smooth central boss section and threaded ends. A connection is made by threadedly connecting the ends of the coupling with a pair of opposed mandrel segments, with the smooth boss of the coupling fitting inside the smooth portion of the bore of each segment to effect, with the threaded joint, a straight, tight joint. A weld groove of gull-shaped cross-section is provided between the opposed ends of a pair of mandrel segments, having a body portion formed by a pair of opposed bevelled surfaces and wings formed by a pair of opposed recesses.

Connection for fabricating mandrel bar from used segments

Growing community of inventors

Birmingham, AL, United States of America

Miles Gerald Sanderson