Pipe Mills manufactures pipes and tubes of different designs. They serve to supply a single material uncompromised at both endpoints. These products are manufactured in pipe and tube mills via seamless or welded technology, dependent upon the manufacturing requirements. Pipe Mills can be classified into two main categories, namely horizontal and vertical.
Horizontal tube mills are mainly used for making pipes and tubes of one-hole diameter and larger. They are generally comprised of three or more machine tools for forming, cutting and pressing the pipes and/or tubes. The pipe-making process is initiated by the cutting of a dike seam that joins the inner and outer pipes. After the dike seam is cut, the pipe is lifted out of the machine, the inner surface of which is formed by the abrasive material to be pressed, and finally the outer surface of which is formed by the abrasive material to be rolled.
Vertical tube milling machines are the other type of pipe-making machines. These are used for manufacturing smaller diameters of tubes, usually less than a half inch diameter. Usually these products require less frequent maintenance and do not require a dike seam. However, as with the horizontal pipe-mills, it is required to use the appropriate equipment and proper maintenance practices to ensure optimum performance and longevity of these machines. The preventive maintenance procedures generally include draining of all water from the machine chambers, cleaning of the work chamber and occasional lubrication of the rotating parts.
Pipe and tube mills are usually made up of steel pipes and metal tubes. Steel pipe is preferred because it does not warp and is strong enough to support the enormous weight of the pipes. Tube steel is less expensive and is also capable of producing thinner and stronger pipes. The common materials that are utilized in making up these machines are iron, cast iron, brass, copper and other similar alloys. The utilization of these different types of materials produces varying results in pipe milling products.
Steel tube mills also make use of mandrels to cut and shape the steel pipes. The basic operating principle is that the operator places a steel pipe inside the mandrel and controls its rotation, while permitting it to pass through the inside of the mandrel and out of the pipe to the opposite end. An automatic control is incorporated in this process so that the cutter cutting the steel pipe can be automatically done at designated intervals. This is one reason why pipe-making machines are designed with a variety of different controls. This makes it possible to adjust the cutter cutting power depending upon the type of pipes to be produced and the desired shapes and sizes.
Pipe and tube mills are generally available in two versions, namely; direct and indirect feed versions. In the direct feed system, pipe production is done by pulling or pushing materials into a cylinder from outside, while maintaining an inner tightness. Indirect feed systems on the other hand require the help of a machine alongside the main production area to do the pumping of materials into the cylinder.