Stainless steel welded pipe inside and outside the weld line leveling device

　　one.Profile
　　Stainless steel welded pipe in the material and mechanical properties are better than stainless steel seamless pipe, but the stainless steel welded pipe inside and outside the weld, especially in the weld more than the removal of the problem has been plagued by stainless steel pipe production enterprises. Although the built-in scraper or internal mill device and other solutions, but the effect is not ideal. Which seriously hindered the further development of stainless steel pipe applications. At present, oil, chemical, nuclear power, boilers, food, medicine and other industries are mainly stainless steel seamless tube。
　　two.Equipment composition
　　Inside and outside the weld leveling rack a hydraulic pneumatic system with PLC control of the automatic electro-hydraulic control system also includes mold and rolling fluid circulation equipment。
　　three.Equipment technical characteristics
　　Stainless steel welded pipe inside and outside the weld leveling device is a built-in mandrel and the use of rollers on the stainless steel pipe rolling reciprocating automatic rolling device, by controlling the rolling strength and pass to achieve the stainless steel pipe inside and outside the weld leveling, thoroughly Remove the inside and outside the weld is too high and the requirements of the base metal flush, popular speaking, is to achieve seamless stainless steel pipe。

　　The drawing part of its equipment is shown below：

　　four.work process
　　With more than the inside and outside the weld of stainless steel welded pipe through the horizontal roller rolling, the more high is removed, the pipe section into a horizontal oval, the mandrel in the pipe was followed by the main pipe to follow the pipe: The cross section becomes a perfect circle, the mandrel is separated from the pipe by the cylinder back to the proper position when the machine is returned, and then the second rolling cycle。

　　The reciprocating trajectory is as follows：

　　三、IGBT on - line bright solution treatment device

　　The development of stainless steel welded pipe, especially industrial stainless steel pipe, is supported by national industrial policy. However, most of the solid solution treatment process of stainless steel welded pipe adopts online black solid solution and then pickling or off-line bright solution. The former brings environmental problems, And

　　Cost increase. The solid solution of the stainless steel pipe can solve this problem. The stainless steel tube is heated by means of induction heating to the temperature required for solid solution (304 material 1040 ° C) and solidified in a hydrogen gas as a protective gas Melting treatment，
　　Improve the weld structure and eliminate stress to enhance the corrosion resistance; with hydrogen as a protective gas can be solid solution after treatment of the welded pipe becomes bright and speed up the cooling rate. The cooling of the stainless steel pipe after heating to the solution temperature is carried out by indirect cooling to keep the pipe bright。

　　Stainless steel welded pipe on-line bright solution of the process of heating and cooling diagram is as follows：

　　The stainless steel welded pipe is heated by the induction heating coil to the temperature required for the solid solution, and the homogenization of the austenite is completed. Water jacket 1 by the end of the graphite cooling jar quench, the temperature dropped to below 800 ℃, to prevent carbon, chromium precipitation to keep the solution effect. The cooling effect of the indirect cooling method will always bring a small amount of carbon and chromium precipitation, and the chromium precipitation rate is slower than carbon, resulting in poor chromium area (poor chromium area is the main cause of intergranular corrosion). But the water jacket 1 in the 550 ~ 750 ℃ between the insulation, to provide a diffusion of chromium time, you can eliminate the poor chromium area. However, 550 ~ 750 ℃ for the stainless steel sensitized area, but because of the water jacket 2 graphite cooling fixture for the rapid cooling of the pipe blocking the sensitization of stainless steel time effect, it will not appear sensitization results. The temperature of the steel pipe cooled by the water jacket 2 should be lower than 130 ° C。

　　A schematic diagram of an industrial stainless steel pipe production line equipped with an on-line bright solution solution：

　　Image code name：
　　1、Two-way swing-type loading frame    2、Forming unit                 3、welder            4、Electric control box
　　5、Welding machine seat              6、Inner bead handling device           7、Weld grinding device    8、Initial sizing device
　　9、Steel pipe cleaning device        10、Online bright solution treatment device  11、Electro - melting device electrical control system

　　12、IGBT frequency power cabinet    13、Final diameter and straightening units        14、Automatic cut - off system for steel pipe

　　Four, stainless steel profile mold (roll)
　　I plant the production of stainless steel profiles all the use of high-quality mold steel Cr12MoV or D2 steel as raw materials, and precision machining (VAD / CAM) and special treatment, high precision, long life。

　　Available from the mold specifications: from Φ4 to Φ325 within a variety of round tube, square tube, rectangular tube and shaped tube mold。

　　Five, round tube polishing machine
　　The machine is used for the grinding and polishing of the outer surface of the stainless steel tube, and it is dryly polished with 8 grinding head or 10 grinding head. The surface roughness of the workpiece is up to Ra0.8μm。

　　The machine can also be used for other materials of circular pipe surface polishing。

　　Six, square tube polishing machine

　　The machine is used for grinding and polishing the outer surface of stainless steel square and rectangular pipe. It is divided into 16 sections, 24 sections, 28 sections, 32 sections and 36 sections。

　　Seven, flower machine

　　Stainless steel flower tube commonly known as gourd pipe, stainless steel decorative profiles are indispensable accessories。

　　Available models are 25, 51, 76, 114 type。

　　Vinda Seiki, every day in progress!
　　Address: Chenzhou City Economic and Technological Development Zone Shigai Tong Industrial Park.
　　Contact: Mr. Zeng（13807358095）
　　telephone / fax: 0735-2791118/2791333
　　Website: www.waenda.com.
　　E-mail: waenda_machine@188.com