What is the straightening process of seamless carbon steel pipe

Seamless pipes are widely used in automobiles, aviation, petroleum, chemical industry, construction, boilers, military and other departments, and occupy an important position in the national economy, so they are called industrial blood vessels. With the development of my country's economy, the application field of seamless pipes has been continuously expanded, the production scale and specifications have been greatly improved, and the requirements for product quality have become higher and higher. Therefore, seamless pipes must be strictly inspected before they leave the factory to meet the requirements for use.

In the casting and rolling process of seamless carbon steel pipe, one of the important technical indicators to measure the processing quality of seamless steel pipe is straightness. Most seamless tubes require straightening, and skew roll straightening is a major workhorse with high efficiency. However, for the bending deformation of the steel pipe ends and large-diameter steel pipes, the pressure straightening method is often used. The structure of the pressure leveler is simple and flexible.

Due to the lack of theoretical research on the pressure correction technology, for a long time, workers have tried and tested corrections based on their own experience, the pressure correction accuracy is poor, the efficiency is low, and the labor intensity is high. Therefore, it is accurate to analyze the deformation behavior of the steel pipe during the straightening process. Calculating the straightening stroke is the premise of ensuring the straightening quality of steel pipes, improving the straightening efficiency, and designing and manufacturing automatic straightening machines.

Calculating the straightening stroke of the steel pipe is the key technology of the automatic steel pipe straightening machine. Aiming at the problem of low stroke accuracy of the current pressure correction thick-walled steel pipe, it usually needs to be repeatedly corrected, and the efficiency is low.
According to the theory of elasticity, the mathematical model of load-deflection in the process of pressure correction of thick-walled steel pipe is established, and the correction stroke of stainless steel seamless pipe can be simply calculated by using this model. The flat deformation of the section is a common problem in the process of pressure straightening of the steel pipe, which seriously affects the processing quality of the steel pipe. Establishing an accurate cross-sectional plane mathematical model can effectively guide engineering practice and realize processing, which has important practical significance for improving yield.

Straightening process of seamless steel pipe:

1. The seamless steel pipe enters the roller table at the entrance of the leveler from the upstream roller table.
2. When the head of the seamless steel pipe is sensed by the sensor element in the middle of the entrance roller table, the roller table will slow down.
3. When the sensor element at the end of the inlet roller table senses the head of the seamless steel pipe, the first stage of the inlet roller table descends, and the closing delay of the inlet quick-opening cylinder starts to count.

4. When the pipe head enters the middle position of the inlet straightening roller, the inlet quick-opening cylinder is closed, the seamless steel pipe is bitten in, and the second inlet roller table falls at the same time.
5. By setting the delay time of the quick-opening cylinder, when the pipe head enters the middle position of the intermediate roll and the exit roll, the quick-opening cylinders of the intermediate roll and the exit roll are closed in turn, and the seamless steel pipe enters the straightening process.
6. When the tube tail leaves the sensor element in the middle of the entry roll, the first section of the entry roll rises.

7. When the tube tail leaves the sensor element at the end of the inlet roller table, the second section of the inlet roller table rises. At the same time, through the setting of the quick-opening cylinder delay, when the tube tail reaches the middle position of the feeding roller, the intermediate feeding roller and the discharging roller, the quick-opening cylinder and discharging rollers of the feeding roller and the intermediate feeding roller are opened in turn.
8. The outlet roller table rises, and the seamless steel pipe is transported to the baffle at the end of the outlet roller table.
9. The exit roller table descends, the side door of the passage is opened, and the seamless steel pipe rolls onto the L-shaped splicing hook by gravity.
10. When the hook falls, the seamless steel pipe rolls onto the soot blowing frame to remove the iron oxide scale on the inner surface of the seamless steel pipe.

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