HuaJin Heavy Equipment

Full-size expanding machine

TIME: 2017-12-19

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Product Description

Steel pipe expanding machine is a large diameter LSAW pipe production process of key equipment. It is located inside the pipe, outside welding and X-ray inspection, ultrasonic flaw detection, before the hydrostatic testing machine.
Before the diameter expansion, the inner wall of the steel pipe is rinsed by the front flushing device. During the rinsing process, the steel pipe is driven by the rotating roller to rotate around the horizontal axis. The purpose of the front rinsing is to wash away residual flux and the like on the inner wall of the steel pipe, Debris damage expansion tool.
Expansion of steel pipe using step-by-step expansion, through the cold expansion, the tension exceeds the yield limit of steel, so that it has a uniform deformation; diameter is designed to ensure the accuracy of steel pipe diameter at the same time, Straight, full circle, to improve the dimensional accuracy of steel pipe, steel pipe to effectively improve the pre-bending, forming, welding residual stress distribution. When the steel pipe is expanded, the inner wall of the steel pipe is lubricated. The purpose of lubricating the inner wall of the steel pipe is to reduce the friction between the inner wall of the steel pipe and the expanding tool in the expanding process. The inner wall of the steel pipe is wetted with the emulsion during the expanding process.
After expanding, the inner wall of the steel pipe is rinsed again. During the process of washing, the steel pipe is driven by the V-shaped lifting roller to move along the axis. The purpose of rinsing is to clean up residual oil, emulsion and scale and other debris when expanding.
The main products: φ325-610 series of full-diameter machine (500T), φ406-1016 series of full-length machine (1100T), φ406-1422 series of full-length machine (1500T).