| 摘要 |
<p>A precision tube cutter by which tubes can be severed without burrs, roughness, or distortion at the severed tube ends, and which is particularly adapted for use in the reconstitution of fuel assemblies of nuclear reactors. In a first embodiment, the tube cutter (40) includes a body (42) having a stem (50) threadedly secured within a bore (44) extending into the upper end of the body. The conical inner end (54) of the stem (50) is adapted for engagement with a pair of diametrically opposed slides (56) for actuating cutting wheels (58) thereon into engagement with the surrounding tube. The slides (56) and cutting wheels (58) are urged toward their inward retracted positions by return springs (62). A second embodiment of the tube cutter (80) incorporates a slidable pin (82) within an eccentric lower bore (84) for actuating a single slide (56 min ) and cutting wheel (58 min ). The slides are disposed in an area of the body which is smaller in diameter than the body end portions to avoid friction.</p> |
