Pipe fluid
seamless pipe cutting methods include shearing, breaking, sawing, flame cutting and anode cutting. Their characteristics are as follows:
(1) Flame cutting method: This cutting method has the lowest operating cost, but the fluid seamless tube consumes more and the cutting quality is poor. Therefore, manual flame cutting is often used as a supplementary cutting means. However, due to the improvement of flame cutting technology, some factories have used automatic cutting with a multi-head flame cutting machine as the main method for fluid seamless pipe cutting.
(2) Shearing method: This method has high production efficiency and low cutting cost. Carbon-carbon seamless pipes and alloy structural steel pipes in low-carbon species are mainly cut by shearing. In order to improve the shearing efficiency, the double-cutting is carried out by using a large-tonnage shearing machine; in order to reduce the flattening degree of the end portion of the steel pipe when cutting, the cutting edge is generally formed by a forming blade; for a seamless steel pipe which is prone to shear cracking, shearing The steel pipe was preheated to 300 ° C when cut.
(3) Fracture method: The equipment used is the breaking press. The breaking process is to cut all the holes at the predetermined breaking fluid pipe with the torch, and then put it into the breaking press and break it with a triangular axe. The distance between the two points is 1-4 times the diameter Dp of the tube blank.
(4) Saw cutting method: This cutting method has the best cutting quality and is widely used for alloy steel pipes, high-pressure steel pipes, fluid seamless pipes, especially for the cutting of large-diameter fluid seamless steel pipes and high-alloy steel pipes. The sawing device has a bow saw, a band saw and a circular saw. Cold circular saws with high-speed steel sector blades are used for cold-saw alloy steel tubes; cold circular saws with carbide inserts are used for high-alloy steel saws.
