51 steel pipe network - steel pipe knowledge channel news: large-size seamless pipe forming technology are: hot spinning method, hot extrusion method, hot piercing rolling method, hot push expansion method. As follows: 1, which is a method of hot spinning plate blank or preformed blank fixed to a rotating mandrel, pressure is applied to the blank with a knob, the knob is axially fed simultaneously through one or more processing , Get a variety of thin-walled hollow rotary products process. The advantage is the product of high precision, good mechanical properties, a wide range of sizes. Tool mold is simple, easy to replace, production costs lower than Other methods. The main disadvantage is the long production hours, low output, the processing of the pipe by the device length restrictions, short size. 2, hot extrusion method need to pre-press the billet pre-processing, when the extrusion diameter of 100mm below the tube, the equipment into small, less material waste, the technology is more mature. However, once the pipe diameter size increases, the use of hot extrusion method requires large tonnage and high-power equipment, the corresponding control system also have to upgrade. 3, hot perforation rolling hot punching and rolling in order to extend the extension of the main rolling and oblique rolling. Longitudinal rolling extension of the main limited rolling mandrel rolling mill, mandrel less limited mandrel rolling, three mandrel mandrel mandrel rolling and floating mandrel rolling. These methods have the advantages of high production efficiency, low metal consumption, good product quality, advanced control system and wide application. Slant rolling extension rolling method with a small investment, the process is short, suitable for small quantities, more varieties, specifications and high precision medium-thickness seamless pipe production has also been widely used. 4, heat push system expanding method to push the system simply expanding equipment, low cost, easy maintenance, economical and durable, flexible conversion product specifications, such as the need to prepare large-caliber elbow and other similar products, only need to add some accessories to. Suitable for the production of thin-walled large-diameter seamless steel pipe, can produce no more than the capacity of thick-walled tubes. The knowledge of steel pipe by the steel pipe network released.
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