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Sectional Broach Tubing

IP.com Disclosure Number: IPCOM000080046D
Original Publication Date: 1973-Oct-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 69K

Publishing Venue

IBM

Related People

Goodrich, RA: AUTHOR

Abstract

This processing apparatus includes four rotatably mounted machining elements 5 arranged in opposed pairs and driven from a common source. Each element 5 includes a tool element 6 with a milling surface 7. The milling surface 7 functions as a broach with a series of teeth disposed at a progressively greater radius from the axis of rotation, to effect a predetermined cut in a single pass.

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Sectional Broach Tubing

This processing apparatus includes four rotatably mounted machining elements 5 arranged in opposed pairs and driven from a common source. Each element 5 includes a tool element 6 with a milling surface 7. The milling surface 7 functions as a broach with a series of teeth disposed at a progressively greater radius from the axis of rotation, to effect a predetermined cut in a single pass.

Each element 5 is carried by a shaft 8, with the rotation of the shafts interrelated by a series of gears represented by pitch circles 9. When shaft 8 is driven, shafts 8a, 8b and 8c rotate in the direction of the arrows within each of the related pitch circles.

In operation, a work piece is advanced into abutting relation with a stop 10, shown in Fig. 5, when the machining elements 6 are rotated away from a cutting position, as shown in Fig. 1 and clamped in position. Thereafter the machining elements are rotated past the positions shown in Fig. 2 and Fig. 3. In the view of Fig. 5, showing a side elevation including only the upper and lower machining elements 5b and 5c, the broaching surfaces 7b and 7c on tool elements 6b and 6c are opposed and milling through the upper and lower walls of workpiece 12. This view corresponds to the tool element positions of Fig. 2. In the position of Fig. 3, the tool elements 6b and 6c have disengaged from workpiece 12 and tool elements 6 and 6a have engaged and are broaching simultaneously through the workpiece side walls,...