US 3,938,415 AGranted

Tube cutoff apparatus

OwnerAlexander Borzyminventor

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Abstract

A double-cut tube cutoff machine for severing steel tubing in such a way as to produce minimum deformation of the tube in the severed area. The machine comprises a base carrying opposing die jaws to clamp the tube, and a ram assembly which moves vertically and reciprocally relative to the base. The ram carries a sharp-pointed severing blade which actually cuts the tubing. A first cam arrangement synchronizes the opening and closing of the die jaws to clamp the tube during a transverse slotting operation as well as during the final severing step. A second cam arrangement synchronizes the motion of a cross slide to ram movement to drive a slotting blade transversely across the tube to notch or slot the top wall part way through prior to the severing operation. The slotting blade is carried in a blade holder which receives inserts of varying thickness so slotting blades of conversely varying thickness all pass over the workpiece in the plane of the severing blade.

Claims9

Dependent claims

Apparatus for severing a tubular workpiece comprising:

a base for receiving the workpiece;
a ram assembly reciprocable vertically and cyclically displaceable relative to the base;
a severing blade carried by said ram assembly;
workpiece clamping means on said base;
actuator means operatively connected between said base and ram assembly for causing said clamping means to clamp the workpiece during a cycle of ram assembly displacement;
slide means on said base carrying a slotting blade and having a work stroke in the plane of the severing blade and transversely of the workpiece for slotting an upper wall of the workpiece;
cam follower means on said slide means;
and, a vertically depending cam carried by said ram and engaging said follower means and being so configured to advance said slide means toward said workpiece only during vertical displacement of the ram assembly away from the workpiece, said workpiece clamping means comprising a pair of complemental die jaws, first and second slide means carrying respective jaws for sliding displacement relative to the base, and first and second cam follower means on respective slide means;
the actuator means comprising a two-part lost motion cam assembly operatively interconnected between the ram and base and engageable with the first and second cam follower means to close the jaws on the workpiece, and stop means on the base and engaging one of the slide means when the die jaws are closed to react against force produced by the work stroke of the slotting blade and transmitted to the one slide means via the die jaw, the other slide means, the cam follower means, and cam assembly.

6 more elements

Apparatus for severing a tubular workpiece comprising:

a base for receiving the workpiece;
a ram assembly reciprocable vertically and cyclically displaceable relative to the base, wherein said ram assembly displacement includes a neutral zone, a slotting zone vertically above the neutral zone, and a severing zone vertically below the neutral zone;
a severing blade carried by said ram assembly;
workpiece clamping means on said base, wherein said clamping means comprises first and second complemental die jaws slidable on the base, and bias means for opening the jaws to receive and release a workpiece, actuator means operatively connected between said base and ram assembly for causing said clamping means to clamp the workpiece during a cycle of the ram assembly displacement, said actuator means comprising a first elongated cam carried by and vertically depending from the ram for continuous reciprocal movement therewith, a second elongated cam slidably carried by the base in vertical aligment with the first cam, and a shaft commonly operatively connected through the first and second cams to produce a lost motion connection between said cams, and cam follower means carried by respective die jaws and engageable with opposite vertical surfaces of the first and second cams during displacement thereof with the ram to close the die jaws, the upward extremity of travel of the second cam and the lower extremity of travel of the first cam being in operative engagement with the cam follower means for the die jaws to open the jaws only during upward displacement of the ram through the neutral zone;
slide means on said base carrying a slotting blade and having a work stroke in the plane of the severing blade and transversely of the workpiece for slotting an upper wall of the workpiece;
cam follower means on said slide means;
and a vertically depending cam carried by said ram and engaging said follower means to advance said slide means toward said workpiece, the cam being configured to advance the slide means toward the workpiece only as the ram assembly traverses the slotting zone.

4 more elements

Dependencies are inferred from the claim text.