| 摘要 |
A ram operated tube cutoff apparatus of the type employed for severing successive lengths of tubing emanating from a source such as a mill includes a transversely reciprocating notching blade for producing a stress relieving notch in the periphery of the tubing, and a severing blade having a thickness less than that of the notching blade for severing the tubing through the notch. The tubing is clamped during the notching and severing operation by reciprocably mounted die jaws each of which comprises a pair of spaced apart, parallel clamping members between which the notching and severing blades may travel. The clamping members are provided with blade supporting parallel surfaces in the opposing spaces thereof for closely receiving the severing blade therebetween to prevent deflection of the severing blade during the cutting process. A first relieved area in the faces of the clamping members along one edge thereof allows passage of the thicker notching blade therebetween, while a second relieved area in the faces produces clearance between the clamping members to accommodate tubing material being deformed and severed away by the severing blade. The additional thickness of the notching blade produces a notch in the tubing of sufficient width to allow unimpeded initial penetration of the severing blade through the tubing in spite of minor variations in the alignment of the path of travel of the severing blade relative to the path of travel of the notching blade.
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