Roll – it's a machine that is used for production of cylindrical, conical or oval shape of the sheet material by bending. The raw material is often a metal such as sheet bending rolls are called. The main working parts are Val rolls – cylinders around which molding material is. The number of cylinders can be different – from three to five. The most common three-and chetyrehvalkovye rolls. Roller machine has a radial adjustment for changes in the magnitude of the gap between Val and, depending on the model – the angular and axial adjustment.

Rollers used in the metallurgical industry have on the surface Valkov deepen – gutters or streams for molding a metal profile. In addition, the rolling mills are distinguished – the equipment used in industry for the manufacture of sheet metal. These mills have two Val. Also dvuhvalkovye mills used for grinding of any material, such as food, or rubber industry. Cylinders – Val in the majority of structures are hollow inside, and, depending on the scope the use of specific equipment fitted with cooling or heating. Rollers are different in the drive: mechanical, electromechanical and hydraulic.

Current models of cars have roll machines. Principle rolls of sheet metal roll is as follows: sheet metal, such as steel, iron, zinc or copper enters the gap between rotating in opposite directions and Val run-around top-Val, forming a circular piece – shell. Shell diameter is regulated by moving the two side Valkov relative to the top with a fixed position. There's also the reverse scheme: moving the upper central outrigger and lateral position is fixed. To obtain conical shells is one of the edges of the sheet bend retarded. Various types of molded metal Valkov in hot or cold. Rolling mills are designed to obtain sheet products. Their work is based on multiple hot lamination blanks between Val. As you go through a metal rolling mills and by adjusting the gap between them roll out a sheet gets thinner and longer. Crushing rolls are grooved surface Valkov. Granular raw material enters the gap between oppositely rotating Val, and passing through them, pulverized by compression. Areas of application rollers, the benefits of rolling machines have a wide range of application and are used in many industries. In metallurgy, machine building and equipment are indispensable rolling mills and rolls bending machines. With these machines produce pipes of various diameters, from water with a small cross section to the wide air. Also, the use of rolls made Breather, chimneys, and various housings and containers, the whole ventilation system. Bending rolls are capable of performing many operations: pre-and tapered curves, various deflections, bending and hem. In milling and food processing mills used crushers. Rubber and chemical industry uses several types of rolls: listovalnye, crushing, refining, sheet metal? processing polymeric materials and for the final product of them. Among the bending roller machine rolls on chetyrehvalkovye today have several advantages: a balanced system of adjustment of the leaf reliability, simple operation and high productivity.