Kinds of Rolling Mills

Cold formed steel production line is used for rolling cold and hot rolled steel into C shaped steel, U shaped steel, L shaped steel, highway guardrail plate and other open cold formed steel. The line can also produce steel sheet piles of different sizes for tunnel construction and foundation fields. At the same time, it can be used with related punch press to meet more different needs of customers. 
  
Shijiazhuang Zhonghui cold bend welding pipe equipment Co., LTD., founded in 1997, is a high-tech enterprise specializing in the development of welding pipe forming technology and the manufacture of complete sets of welding pipe equipment. We can provide cold formed steel production line for sale. Welcome to contact us. 
  
In this article, we will complete a series outlining the differences between four-roller mills, cluster mills, continuous mills and planetary mills. At Zhonghui, we believe that understanding these differences will help our customers make the right choices for their specific needs. 

Four high rolling mill 

  
A four-high mill is used to thin materials to minute thicknesses. By using support rollers, roll deflection problems can be avoided and smaller work rollers can be used. The reduction of the diameter of the work roll reduces the total separation force required under pressure. Reduction reduces the total energy required by the material and produces a more consistent thickness output. 
  
Cluster factory 
  
A cluster mill is a special type of four-high mill in which each of the two work rolls is supported by two or more larger support rolls capable of rolling hard materials. It may be necessary to use reels of very small diameter but considerable length to achieve the desired effect. These mills can roll hard materials, including stainless steel, titanium alloys and nickel alloys. 
Even the mill 
  
For continuous mills a series of mills must be used to pass the same amount of material through each stand in a given time. If the cross section is reduced, the velocity must increase proportionally. The speed of each set of rolls is synchronous, so the input speed of each stand is equal to the output speed of the previous stand. Single reel winders and winders not only feed the material into the roll, but also provide forward tension to the strip after tension. 
  
The planetary mill 
  
The mill consists of a pair of heavy support rollers surrounded by a large number of asteroid rollers. The main feature of the mill is that it can hot roll slab into strip coil in a single pass. This operation requires a feed roller to bring the slab into the mill and a pair of leveling rollers to improve surface finish at the exit. 
  
Classified by volume number and arrangement 
  
Rolling mills are classified by number and arrangement of rolls. Two roller mill can be divided into reversible and non - reversible mill. A two-high mill consists of a two-high stand and two horizontal rollers that sit on top of one another. In this type of mill, one or both rolls are adjustable. In its operation, metal passes between two rollers at the same speed but in opposite directions. 
  
They usually have larger-diameter rollers that are positioned by hydraulic, pneumatic, or electromechanical drives. After each pass, the direction reverses. The sheet metal is turned 90° to maintain a uniform cross section and fine grain size. It takes about 25-30 passes to convert ingots into billets. 
  
Two high rolling mills are used for galvanizing line, pickling line and straightening machine.Because of the larger roll diameter and bite capacity, softer materials can be used. Materials such as hot steel need to be reduced from slab to plate in a single pass, need to be significantly reduced, to name but one example. They are also used in the rubber and plastics industries.They are also used to improve metal mesh or punch gold.

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