| 摘要 |
<p>The device is for the mfr. of seamless tubes and is mounted on a pilger mill, using a hydraulic cylinder to move the feed slide forward at a uniform velocity, thus pushing the tube-blank into the gap between the rolls. A compressed-air cylinder with a reciprocating piston is used, the shaft of the piston functioning as a second, differential piston in a smaller coaxial cylinder fed with hydraulic fluid and used for breaking the stroke; on the end of the shaft is a gear and a toothed rack which are used to turn the tube-blank through 90 degrees, i.e. to eliminate the flash on the tube. The higher reciprocating speed of this device means that, for a given roll speed, more tubes can be produced.</p> |
