Low alloy welded pipe basic five-step processing steps
1. Low-alloy welded pipe nominal diameter production and processing: fan-shaped block from the front position to reduce the speed of movement, until it reaches the required position, this position is the quality requirements of the finished pipe inside the circumference of the position.
2. Low-alloy welded pipe spring compensation production and processing: fan-shaped block in the part of the 2 links just started to further lower the rate until it reaches the required position, this part is the process of technology before the spring compensation of low alloy welded pipe inner circle on the position.
3. Low alloy welded pipe pressure holding and smooth production and processing: The fan block remains motionless for a period of time at the upper part of the inner circle of the low alloy welded pipe before springing back, which is the pressure holding and smooth session stipulated by the machine equipment and the diameter expanding process.
4. Low alloy welded pipe throwing and reintegration production process: The fan block starts to shrink rapidly from the upper part of the inner circle of the low alloy welded pipe before springing back until it reaches the original expansion part, which is the most closed diameter of the fan block as stipulated in the diameter expanding process.
5. Low-alloy welded pipe rounding production and processing: the fan block is opened until all fan blocks touch the inner cavity of low alloy welded pipe, at this time, the radius of each point in the inner circle of low alloy welded pipe within the range of the step are basically the same, and the low alloy welded pipe obtains the basic rounding.
