Average Rolling Unit Pressure
Rolling is an important process in metal forming industry, which plays the role of improving material plasticity and changing shape, size and performance of materials. Average rolling unit pressure, is an important measure to evaluate the mechanical plastic forming ability of the material. It is mainly used to measure, analyze and judge the stable rolling contact pressure of the rolling mill in order to provide a basis for the design of the rolling process and the selection of process parameters.
The rolling process is composed of two parts: contact between metal and roller and relative movement between them. The normal contact pressure between metal and roller strongly affects the shape, size and performance of the material. Inversely, the shape, size and performance of the material determine the contact pressure. Generally speaking, in order to meet the process requirements, the pressure or separating force needs to be controlled. For different metal materials, their performance and tolerance to the pressure is different. In order to meet the needs of different tasks, it is necessary to improve the design of process parameters and production processes by calculating the average rolling unit pressure.
The average rolling unit pressure is an important index to evaluate the rolling load of the roller and the surface quality of the rolled material. The average rolling unit pressure is affected by the following factors: the roller speed, the diameter of the roller, the thickness of the steel sheet, the number of passes and whether the surface of the roller is quenched. At present, the mechanical parameters of rolling in most metal processing industries are based on the average rolling unit pressure.
For the sake of the deformation uniformity, the average rolling unit pressure should be determined by the dynamics method through theoretical analysis and calculation. First of all, according to the size and shape of the steel sheet, the rolling parameters such as roll diameter and roll speed should be determined according to the blank volume and the total length of the steel sheet. Then, the stress or pressure should be obtained by equation analysis. Finally, the average rolling unit pressure should be obtained by averaging the theoretical pressure or stress value.
Generally speaking, a larger average rolling unit pressure indicates that the deformation ability of materials is stronger and the forming precision is higher. That is to say, a high average rolling unit pressure is the basis of the higher forming quality and the better molding performance. Theoretically speaking, the greater the average rolling unit pressure is, the better the forming effect and the higher the forming quality.
In conclusion, the average rolling unit pressure is an important measure to evaluate the mechanical plastic forming ability of the material. The average rolling unit pressure is affected by the roller speed, the diameter of the roller, the thickness of the steel sheet, the number of passes and whether the surface of the roller is quenched. A larger average rolling unit pressure indicates that the deformation ability of materials is stronger and the forming precision is higher.
