System For Supplying Lubricant, Apparatus For Manufacturing Seamless Pipes Or Tubes, And Method Of Manufacturing Seamless Pipes Or Tubes

An apparatus for manufacturing a seamless pipes or tubes, comprising:

• a rolling mill including a plug oriented in a piercing direction, a pair of disc rolls disposed on both sides of an axis of the plug in a first plane including the axis, and a pair of main rolls disposed on both sides of the axis with a predetermined inclination to a second plane including the axis and orthogonal to the first plane;
• and
• a system for supplying a lubricant including a storage tank of the lubricant to be supplied to the disc rolls, a plumbing extending from the storage tank to a position near the disk rolls, a spray nozzle provided at the tip of the plumbing, a device for switching flow direction provided in some midpoint of the plumbing, a plumbing extending from the device for switching flow direction to the storage tank, and a device for releasing pressure in the plumbing, provided between the device for switching flow direction and a spray port to the disc rolls of the plumbing.