Technical Analysis of Cross Rolling Expanding Machine for Seamless Steel Tube
This machine works by pressing a tube onto a group of rollers to form and shape it which is known as cold-working. This process is primarily used in the production of precision tubes with relatively thin wall thickness and complex tube shapes. This cold-working process allows for high precision and manufacturing accuracy of the steel tube by forming and deforming the material, yielding a strong and consistent internal surface finish, surface hardness and metallurgical microstructure.
Generally, cross rolling expanding machines are designed with two main components, the main and auxiliary rolling stations. The main rolling station consists of upper and lower roller modules, while the auxiliary rolling station contains auxiliary rollers and accessories such as take-up and bounce back controllers. The upper roller module is mainly composed of upper and lower body frames, drive motors, cutting tools and transmission systems. On the lower roller module, the rolling bearings, spacers, shafts and other accessories are fixed.
The upper and lower roller heads are calibrated by the upper and lower bearing tables, respectively. The rollers are adjusted according to the parameters of the tube to be rolled. The number of main rollers and their installation interval on the cross rolling expanding machine varies depending on the size of the tube. The larger the diameter of the tube, the more rollers are required. The auxiliary roller is also adjusted according to the tube and its axis is perpendicular to that of the main roller.
The operation of the machine is composed of two separate processes: expanding and cutting. During expanding, the upper and lower rollers are powered to press the tube into the required shape, deforming and reshaping the material. This process is known as cold working, is done without application of heat. For the cutting process, the upper and lower rolls are powered to press down on the tube and the cutting tools are activated to cut off the bent portion of the tube, thus producing the desired length of tube.
The cross rolling expanding machine can be used to manufacture tubes made of a variety of materials, including alloy steel, stainless steel and aluminum alloys. The machine is also able to produce tubes with multiple internal shapes, depending on the configuration of the upper and lower roller modules. Depending on the type of material, different cutting tools and techniques such as waterjet cutting, laser cutting and EDM cutting, can be used.
Cross rolling expanding machines offer a range of advantages over traditional methods of tube formation, such as higher manufacturing precision and tolerances, better strength and uniformity of tubes. In addition, the machine produces tubes with a stronger raw material, less wastage and better internal surface finishes.
In conclusion, cross rolling expanding machine is a special type of equipment used for forming high precision tubes. The machine is capable of producing tubes with very precise specifications and can be used to form tubes of a variety of materials. Its advantages include higher precision and tolerances, better strength, better internal surface finish, more efficient manufacturing and less wastage.
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