Deformation principle of cold rolled tube

Cold rolling process is widely used in the production of large varieties of steel products; it has greatly improved the product quality and greatly reduced the production cost. The process is mainly composed of several parts: uncoiling, flat rolling, coiling and straightening. The purpose of the cold rolling process is to reduce the material thickness and improve the shape accuracy of the material. The principle of cold rolling process for steel pipe is as following.

First of all, the steel tube is install in the cold rolling mill after being uncoiled. Then, the main rolls of the rolling mill begin to exert pressure on the tube, resulting in its deformation. The steel tube passes between the two main rolls with a certain speed, and gradually deforms gradually. The rolling force of the main rolls is the direct force that causes the steel tube to be deformed. On the other hand, there are also a pair of side rolls that cooperate with the main rolls to close the gaps between the two parts, and the distance between them is adjustable.

When the steel pipe is squeezed, the outer surface of the tube is highly compressed and the radius of curvature of the tube is also reduced. In other words, the radius of curvature of the tube decrease significantly due to the squeezing force of the two main rolls. At the same time, the height and width of the tube also decrease; the outer surface and the inner bore of the tube are also getting smoother and more uniform.

The depth of the pressure applied to the steel tube, the alignment of the two main rolls, the adjustment of the distance between the two side rolls can all affect the properties of the final product. With the help of sophisticated instruments and systems, cold rolling mill has a high degree of accuracy to achieve the desired product quality.

The purpose of cold rolling process is to reduce the thickness of the steel tube and improve its shape accuracy. The combination of the squeezing force applied by the main rolls, the cooperation of the side rolls, and the precise controlling of the process parameters all contribute to the success of the cold rolling process. This process has become the main production process for steel pipes in the world today.

The cold rolling process has great advantages in terms of product quality and production efficiency. Steel pipe products produced by cold rolling process have uniform density and thickness, and excellent shape accuracy. In addition, the production costs are greatly reduced due to the fast speed and high precision of the cold rolling process.

In short, the cold rolling process is a very important process in modern steel pipe production industry. It can make the steel pipe thinner, its shape more accurate, and greatly reduce the production costs. It has greatly improved the product quality and greatly reduce the production cost.

Cold rolled tube deformation principle

Cold rolled tube is a process in which metal material is rolled at room temperature. This process results in a finer grain size, which contributes to improved mechanical properties over hot rolled tube. Moreover, cold rolling eliminates the need for post-process annealing, further reducing production times, cost and energy consumption.

The deformation principle involved in cold rolling tube is similar to that of other cold rolled materials. When a portion of the material is captured between two compression rolls, the material is plastically deformed along its length according to the applied pressure and rolling pressure. The final tube is then cut to desired length using a specialized slitting operation.

The deformation rate of the tube in cold rolling tube operation is very high, so that a pressure of 0.35~0.8 kN/mm2 (35000~80,000 N/mm2) is partially applied to flatten the surface of the initial material. With this application pressure, the exact degree of deformation can be controlled correctly. This is the major principle adopted in cold rolling tube to shape it almost accurately in desired dimensions.

When cold rolling tube is used to prepare thin walled components, there is a risk of thinning due to the high deformation rate. However, there are rolls that are designed to both thin and form the material simultaneously to reduce thinning compared to thinning-only operations.

Overall, cold rolled tube material has many advantages compared to hot rolled tube. Its excellent mechanical properties, high formability and low cost make it an attractive solution for many industrial tubing applications. The deformation principle involved in cold rolling tube is simple, yet the process can be precisely controlled to produce the desired results.