?? Shandong shunxinda Machinery Co., Ltd. (13969559358) is located in Liaocheng Economic Development Zone, Jiangbei water city with beautiful scenery. It is a company specializing in the production, processing and sales of precision seamless pipe, cold drawn precision seamless pipe and cold-rolled precision seamless pipe
? Rolling methods of various Q345B precision bright tubes with secondary piercing
? Automatic tube rolling: one of the ways of rolling Q345B precision bright tube. The rolling equipment consists of piercer, automatic pipe mill, homogenizer, sizing mill and reducing mill. Piercer: common two roll cross rolling piercing process. The axis of the two rollers and the rolling line form an inclined angle. In recent years, the inclination angle has changed from 6 กใกซ twelve กใ To 13 กใกซ seventeen กใ, Make the piercing speed faster. Rolling Q345B precision bright tube with diameter over 250mm. To reduce the wall thickness of the capillary. Some new processes, such as perforation with active rotating guide plate, perforation with back thrust, axial discharge and top welding with circulation, have also been developed to some extent, thus strengthening the piercing process and improving the quality of the capillary. Automatic pipe mill: the thick wall tube is rolled into thin-walled tube. After 23 passes, the total elongation is about 1.82.270. Since the 1970s, the rolling efficiency has been improved and the pipe rolling mechanization has been completed by using single hole groove roller, double stand tandem mill, double groove tracking rolling and spherical crown technology. Homogenizer: similar in structure to piercer. The purpose of evenness is to eliminate the appearance defects inside and outside and ellipticity of waste pipe, and reduce the uneven transverse wall thickness. In recent years, three roll homogenizer has been used to improve the deformation and efficiency of the homogenizer. Sizing mill: it is composed of 312 frames, and the reducing mill is composed of 1224 frames, and the reducing rate is about 328%. The stretch reducing mill, which was introduced in the 1950s, can control the wall thickness with proper tension while adjusting the roll speed and reducing diameter. The new type of stretch reducing mill is commonly used with three rollers, with 1828 stands. The large diameter reduction rate reaches 80%, the wall reduction rate reaches 44%, and the outlet speed reaches 18mm per second. The defect of thickening at both ends of the stretch reducing mill can be eliminated by "sudden electrical control at the head and tail end" or micro tension reducing.
??? Automatic pipe mill: the common series are: the outer diameter is 100mm140mm, 250mm and 400mm, and the outer diameter is 17426mmq345b. The characteristics of the mill are that the main deformation is completed on the piercer, the specification change is more sensitive, and the range of rolling types is wide. Due to the development of continuous pipe rolling technology, it is no longer necessary to build a unit with a diameter less than 140mm. Continuous pipe rolling: rolling equipment consists of piercing mill, continuous pipe rolling mill and tension reducing mill. After the round billet is pierced into the blank tube and inserted into the mandrel, it passes through 79 rolls, and the axes are 90 to each other กใ Equipped with two high rolling mill for continuous rolling. After rolling, the mandrel is pulled out and the stretch reducing is stopped after reheating. The steel pipe can be rolled up to 165m. The annual output of 140mm continuous pipe mill is 40.6 million tons, which is 24 times of that of automatic pipe mill. The features of the mill are that it is suitable for rolling Q345B precision bright tube with outer diameter less than 168mm. The equipment investment is large, the installed capacity is large, the mandrel is as long as 30m, and the processing and manufacturing is complex. The limited mandrel continuous pipe mill (MPM) was developed in the late 1970s. During rolling, the mandrel was forced to move at a speed less than Q345B precision bright tube by external force. The metal moving condition can be improved. Long tube and large diameter Q345B precision bright tube can be rolled with short mandrel. Periodic tube rolling: the polygonal and round ingots or continuous casting billets are used as raw materials. After heating, the cup-shaped blanks are formed by water pressure piercing, and then the tubes are rolled by a two-roll cross rolling extension mill. Then, a section of Q345B precision bright tube is rolled by one turn of the roll on the periodic pipe rolling mill with variable diameter hole groove. The periodic pipe mill is also known as the pilger pipe mill. Using ingot as raw material, periodic tube rolling is suitable for rolling large diameter thick walled Q345B precision bright tube and variable cross-section pipe. Three roll tube rolling: mainly used for rolling Q345B precision bright tube with high dimensional precision. The wall thickness precision of Q345B precision bright tube rolled by this method can reach the standard กภ 5%, which is about twice as high as that of tube rolled by other methods. The technological process is shown in Fig. 460's, this method was developed rapidly due to the creation of a new type of three high skew mill (called Transval mill). The characteristics of the new rolling mill are that when rolling to the tail, the inlet rotary stand is rapidly rotated to change the rolling angle, so as to avoid the formation of triangle at the tail end, so that the ratio of outer diameter to wall thickness of rolling type can be expanded from 12 to 35, not only can the thin-walled Q345B precision bright tube be rolled, but also the rolling ability can be improved. Pipe jacking rolling: the traditional method is that the billet is extended into cup-shaped tube by hydraulic piercing and cross rolling. The long mandrel is inserted into the bottom of the cup by the push rod, and then the tube is formed by top rolling through a series of roller die sets with gradually reduced hole groove. This rolling method has less equipment investment and can be used for continuous casting billet. It can roll Q345B precision bright tube with diameter up to 1070 mm and wall thickness to 200 mm. However, the rolling efficiency is low, the wall thickness is similar to the thickness, and the specific efficiency of tube length is short. After the introduction of CPE process, the tube blank is pierced by cross rolling, and then extended into tube by top rolling after closing, which overcomes some defects of the traditional method, and has become a better economic method in Q345B precision bright tube rolling. Extrusion tube rolling: firstly, the peeling round billet is stopped from piercing or expanding, and then it is heated by induction heating or salt bath, and the inner and outer surface is coated with smooth agent and sent to the extruder. The metal is extruded into pipe through the annular gap between die hole and mandrel. It is mainly used for rolling low plasticity high temperature alloy pipe, special-shaped pipe and composite pipe, non-ferrous metal pipe, etc. The rolling range of this method is wide, but the output is low. In recent years, due to the improvement of die data, smooth agent and extrusion speed, extrusion tube rolling has also been carried out. Tube rolling with guide plate
?? The company reserves a variety of specifications of precision seamless pipe, cold drawn precision seamless pipe, cold-rolled precision seamless pipe, perennial business in Tianjin, Baotou Steel, Baosteel, Hengyang, Angang, Chengdu, Yegang, Lubao, Anyang, Jiangyin, Hongdu and other high-quality seamless steel pipe, alloy steel pipe, high-pressure boiler pipe, alloy high-pressure seamless pipe, thick wall seamless pipe, fluid pipe, structural pipe, chemical fertilizer special pipe, Petroleum cracking pipe, low pressure boiler pipe, large diameter seamless pipe, large diameter welded pipe, precision steel pipe, etc. The materials of common resources are: 10 กม 10, 20 กม 10, 45 กม 10, 16Mn, 27SiMn, 12Cr1MoV, 15CrMo, 12Cr1MoVG, 15CrMoG, 10CrMo910, 20Cr, 40Cr, 35CrMo, 304, 316, 316L, 310S, 309S, etc.