Mobile mandril cooling and lubricating device

Abstract

A cooling lubricant device with a removable mandrel bar relates to metal rolling. In order to avoid the abrasion problem on the mandrel bar at high temperature and pressure during the seamless steel tube rolling process, the method of single mandrel bar cooling and single lubricating systems is generally applied, which degrades the quality of the tube inner wall for the low productivity effect and poor lubrication effect. The mandrel of the invention is a hollow rotary body when in operation and inputs the lubricant and cooling water simultaneously into the mandrel bar which is rotating via the insulation and closure structure between a holder and a connector body, with the lubricant ejecting from the front head of the mandrel to lubricate the tube inner wall while the cooling water, so as to form a circuit within the mandrel bar to cool down the temperature for the mandrel bar. When in the rolling process, not only the mandrel bar can be cooled but also the tube inner wall can be lubricated, which can prolong the service life of the mandrel bar and improve the quality of tube inner wall. Besides, the dosage of the lubricant consumption is decreased, cost is saved and environmental pollution is reduced.

Description

technical field [0001] The invention relates to metal rolling, in particular to a simultaneous lubricating and cooling device for a movable mandrel of a hot-rolled seamless pipe rolling mill. Background technique [0002] In the rolling of hot-rolled seamless pipes, long mandrels or short mandrels are usually used for rolling. Since the mandrels are subjected to the double harsh environment of high temperature and high pressure when rolling in the pipes, some mandrels are also combined with the pipes according to the process requirements. produce a relative speed difference. Therefore, the wear of the mandrel and under the action of high temperature and high pressure consume a lot, resulting in high production costs. In order to solve the above problems, the methods of separate mandrel cooling and separate lubrication system are generally adopted. That is: use 6 to 8 hollow or solid mandrels as a group, and use them in turn during the rolling process; spray lubricant on th...

AI Technical Summary

Problems solved by technology

This method not only has low production efficiency, but also the lubricant is easy to fall off from the mandrel under the high temperature and vibration during the rolling process, which reduces the lubricating effect

Some manufacturers use manual or simple devices to spray lubricant into the pipe before rolling. The fatal weakness of this method is that the lubricant cannot be sprayed evenly into the pipe, which not only seriously pollutes the working environment, but also wastes a lot of lubrication. agent

Due to the above reasons, the quality of the inner wall of the rolled pipe will eventually be reduced

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