In some metal rolling operations, in the forming of very thin work, the rolls can be as small as 1/4 inch. Tube rolling process at manufacturing plant. It is use for mass production of threaded parts like screw, bolts etc. The reeled tube is then sized by a sizing mill to the specified dimensions. The tube (referred to as a mother tube) after finishing and inspection, becomes a finished product. Construction material, roofing panels, partition beams, railroads, etc. The Elastic deformation of mill takes place on the metal.So some of rolling defects are provided in the metal forming. Rolls are subject to extreme operating conditions during the metal rolling process. In metalworking, rolling is a metal forming process in which metal stock is passed through one or more pairs of rolls to reduce the thickness and to make the thickness uniform. The following chart can be used for determining the correct tube wall reduction. This is time consuming and requires a tremendous amount of skill.

then be pulled through the expanded liner to complete the expansion process. Closeup of production process of metal pipe.

Pick 3 to 5 tubes in the unit to be rolled and complete the formula on the page A-1.

Mechanical rolling reduces the tube wall by; a) stretching the tube radially, and b) imposing high unit rolling forces that cause the tube to extrude axially. When rolling a tube joint, there is an elongation of the tube; the tube actually grows by a fraction of an inch. Round shape heated billet of steel is passed in between the taper rolls over a mandrel. Industrial machinery in heavy. The process can produce pipe as quickly as as 1,100 ft (335.3 m) per minute. The concept is similar to the rolling of dough. The following suggestions are offered to aid in the setting up process for rolling tubes into a heat exchanger or boiler. (5) In mechanical rolling, a set of hardened rolls in a cage rotate around a tapered mandrel. For seamless pipes, a process of heating and high-pressure rolling of square billets causes them to stretch with a hole in the center.
A good start assures good end results: 1. Tube end forming involves machinery to establishing a secure connection and can include one of many categories, such as: Reduction tube end forming – A process where the tube diameter is reduced using dies and tapered rings, depending on the application. The tube rolling process or roll tube is used to produce long and thick- walled continuous tubing. Process of Tube End Forming. rolling defects of after machined metals The rolled parts are more thicker than the required thickness of metal because of the rolls get deflected by high rolling forces apply. are rolling … The tubes shall be expanded and flared to an outside diameter of at least 1/8” greater than the diameter of the tube hole or they may be flared, rolled and welded except as provided in pwt 11.2; or rolled and seal welded without flaring provided the throat of the seal weld is not more than 3/8” and tubes are re-expanded after welding. In flat rolling processes, during industrial manufacture, the rolls may typically be 24 to 54 inches in diameter. Rolling mills pierce the pipe for the desired thickness and shape. Gears can be cut on gear blank by rolling process. Tubing diameters up to 152 mm/6 inches can be rolled efficiently. It tube rolling machine having two tapered rolls called piercing rolls and rotate in same direction. In this rolling is mainly used to producing seamless tubes. From this step the tube goes through the straightener.

This growth causes pressure between tube sheets. To assure a proper tube joint, the tube wall must be reduced by a predetermined percentage. The rolls travel up the mandrel causing an increasing radial force exerted at the contact point between the rolls and the tube.

Tube rolling includes the production of both hot-rolled pipe and cold-rolled pipe, which is first hot-rolled and then cold-rolled.

This process completes the hot working of the tube. Rolling is classified according to the temperature of the metal rolled. Rectangular tube, square tube and round tube can be rolled to be used as a curved stair stringer, spiral stair stringer, spiral handrail, curved guard rail, or decorative feature to a curved stair.


Tube Expanding is based on engineering principles, involving elasticity and plasticity, to compress the OD of the tube against a fixed container, such as rolling tubes into tube sheets, drums, ferrules or flanges. Rolling rectangular tube is just one of our structural shape rolling capabilities, we also do square tube rolling, pipe rolling and round tube rolling. Tube Rolling Setup Guide. Large length cross sections are produced by rolling process. The tube-rolling process uses a wide range of rolling mills, which differ in the method of rolling and the size and type of pipes produced. Rolling is used for making hollow seamless tubes, rods etc.

The sequence of rolling tubes into drums and water wall headers is as important as rolling the tube joints themselves. It is particularly applicable to small-diameter cylindrical or tapered tubes in lengths up to 6.1m/20 ft.