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Briefly analyze the defects and causes of the cold roll forming machine.

1. The weld of the cold roll forming machine is cracked or broken
1) In the production process, the thickness and width of the raw materials are unstable, resulting in false welding.
2) Insufficient extrusion force during welding causes poor welding seam fusion.

2. The bending of the cold roll forming machine does not meet the standard
1) Uneven steel pipe wall thickness (uneven thickness of raw materials or produced by production).
2) The different rolling diameters lead to uneven deformation of the steel pipe, resulting in bending.

3. The size of the cold roll forming machine fluctuates greatly
1) It has improper operation when adjusting rolling.
2) The solid speed is too fast, resulting in large fluctuations in size.

4. The burr on the surface of the cold roll forming machine is serious, resulting in a "rat tail".
1) The cutting blade becomes blunt, making the gap too large and easy to remain. The saw blade is dull, or the cold roll forming machine is installed improperly, it is easy to cause burrs.
2) Excess metal is extruded at the weld seam when welding the pipe. Irregular welding system will also make it easier to leave burrs during cutting.

5. The surface of the welding seam of the cold roll forming machine is uneven and the unevenness is obvious.
1) The welding seam is convex, and the welding seam gouging depth is too deep, which causes the flatness to decrease.
2) The weld is concave, and the depth of weld gouging is shallow.

6. The R angle of the square tube or the shaped tube of the cold bending machine is uneven
It is mainly caused by improper production operation.

7. The cold roll forming machine port sawing is not neat, inclined or uneven.
It is mainly caused by shearing deformation during shearing makes the ports uneven.

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