Forming Equipment Rolling

Classification of rolling processes rolling process on the roll forming equipment manifold. They can be classified by various characteristics. Longitudinal, transverse and oblique (helical) is determined according to vzimnomu location of the axes of the treated body and rolls. If the axis of the rolled strip is perpendicular to the axis of the rolls, the rolling is called longitudinal. When takm method of rolling strip only forward, ie performs only translational motion. Longitudinal rolling is the most common.

For the transverse axis rolling obratyvaemogo body parallel to the rolls. Axis of the rolls rotate in one and tighter storoonu. They are gradually converging, in thereby reducing the diameter of the product, which also revolves, but in the opposite direction of rotation of the rolls. In the longitudinal direction of the processed body does not move (unless otherwise pulling devices). Side rollers perform an auxiliary function: they keep the product between the rollers. Cross rolling is used in metallurgy and machinery for the production of axles, shafts, bushings, gears and other products such as body rotation.

Skew rolling, also known as helical, occupies an intermediate position between the transverse and longitudinal. In this case, the axis of the rolls at an angle to each other and to the axis of the rolled round billets. Thanks such location rolls billets in the rolling process does not only rotational but also translational motion. Since the roll angle with respect to the axis of the workpiece body is usually small (up to 12-18 degrees), oblique rolling nature closer to transverse than to longitudinal. Process skew rolling Shirikov used in the manufacture of seamless pipes, particularly at the piercing mill, where of a solid round billet get dirty tube – the pocket. Special type of rolling is the so-called periodic rolling. It is characterized by Temo during deformation height of the gap varies periodically. Most often this is achieved by making the rolls special non-circular shape. In this way receive periodic profiles of rolled shape cross section which varies periodically along the length of the strip. When you change the compression is changing all the parameters of rolling, so periodic rolling can be characterized as non-stationary (in the transitional areas). Further, the rolling process is divided into symmetrical and asymmetrical. Symmetric rolling call such a process in which impact of each of the rolls on the body is processed in exactly the same, identical. If this condition is violated, then called asymmetric rolling. Among the asymmetric processes are: rolling in rolls unequal diameter, rolling one of the driving roller, rolling at different circumferential speeds of rolls, rolling or uneven (asymmetric) distribution of mechanical properties along the height of ledge, rolling at different conditions of friction on the rolls, etc. An important condition for the rolling process is the presence or absence of external forces applied to the ends of the strip. On this basis distinguish between free and commercial rolling. Free call rolling when the strip forces act only from the rolls. Non-free rolling is carried out with the intention or pressurization end of the strip. Tension force or the backwater created adjacent mill stands, Coiler-tensioning drums or other devices.