Cutting – Processes – Cutting wall of hollow work
Patent
1977-05-23
1978-08-22
Abercrombie, Willie G.
Cutting
Processes
Cutting wall of hollow work
83300, 83310, 83319, 83385, 83578, 83917, B26D 156, B26D 316
Patent
active
041080297
ABSTRACT:
A cut-off die set is disclosed for use in a cut-off apparatus of the type in which continuous length of tubing or other elongated stock emanating from a tubing mill is severed into lengths as the tubing emanates from the tubing mill by means of a cut-off die set mounted within the cut-off apparatus. The cut-off die set is adapted to be clamped to the tube so as to move therewith during severing of the tubing by a ram operated cut-off blade descending vertically to shear the tubing. The present disclosure involves a improvement to a notching mechanism often included in such cut-off apparatus in which a horizontally reciprocated blade notches the upper portion of the tubing just prior to severing by the main cut-off blade so as to eliminate dimples in the severed tube cross section. The improvement lies in a different timing of the movement of the notching blade with respect to the motion of the main blade, coupled with a different configuration thereof, the improved notching mechanism consisting of a notching blade having a hook shaped cutting edge which is pulled from an initial position extending over the tube across the upper portion of the tubing in order to notch the same, with the notching blade returning to its initial position after severing by passing through the opening in the tube created by the main cut-off blade. This drastically reduces the velocity of the notching blade operating mechanism, improving wear on the blade and other movement parts as well as reducing the loads on the operating mechanism. In addition it eliminates the blade drag normally associated with withdrawal of the notching blade prior to severing of the tubing section as occurs in conventional designs.
REFERENCES:
patent: 2741309 (1956-04-01), Czarnik
patent: 3129624 (1964-04-01), Auer
Abercrombie Willie G.
Alpha Industries Inc.
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