Following fast growth of Chinese economy, high-grade, large diameter and high frequency straight seam welded pipes are widely used in areas such as petroleum transportation, urban pipeline networks and constructions, pushing up demand for them, which creates new development opportunities for pipe line manufacturing firms and equipment manufacturers.
During the recent years, by learning and absorbing advanced ERW machine technologies from abroad, we designed and developed large diameter ERW production lines with our own intellectual property rights. Especially some single units, such as squeeze roller, have been patented in China. So far, we have finished designing large caliber ERW production lines with specifications: 16" ERW, 20" ERW, 24" ERW. Among those the 20" ERW, 24" ERW production mills were already put into operation; For Guangzhou Juyi Steel Pipe Manufacturing Co., Ltd, another complete set of 25" ERW production line with horizontal loop. High Speed Edge Milling Machine with sawmill. Cutting Machine and Finishing Area, was already in operation; a complete set of 25'ERW line to be exported to WBHO in South Africa is already under testing.
In addition, our company has mastered all techniques for ERW630x19.1mm with iron grade X80, and has developed JCOE1420x32mm with iron grade X80 welded pipe production line.
|Uncoiling||Two driving expanding shafts with the functions of tension control and horizontal adjustment of strip steel|
|Strip steel flattening machine||With 5 working rolls opened/closed quickly by hydraulic cylinder.|
|Welding process of plate at head and tail ends||MAG welding, CO2 gas shield.|
|Horizontal welding machine design||Combined cutting and welding together.|
|Positioning of strip steel before welding||Automatically measure and align the position of strip steel.|
|Spiral accumulator||Outside in inside out|
|Strip feeding speed||Maximum 75m/min.|
|Height of rolling line||About 1000mm above the horizon|
|Production mode||continuous production|
|Speed of production line||12m/min~25m/min.|
|Drive type of main frame||Each roll is separately driven by CNC AC variable frequency speed control or DC speed control|
|Forming idea||Fix the rolling line, down forming method|
|Height of center line||About 1000mm above the horizon (sizing section)|
|Type of forming||cage forming|
|Setting of rolling mill||PLC-controlled quick setting system and manual forced setting|
|Adjustment of mill rolls||PLC-controlled automatic adjustment and manual adjustment.|
|Inner burr scraping||Inner burr is scrapped by using ring knife that is installed special tool rest.|
|Outer burr scraping||Two scrapers of outer burr and one crimpers of outer burr.|
|Sizing of pipe||Four sizing stands are used for producing circular pipe.|
|Steel pipe straightening||Straighten steel pipe by turkey heads and sizing mill.|
|Mode of flying saw||CNC Double mill cutting head flying cut-of machine.|