1. According to the specific situation of elbow, make it clear to make it consistent with the speed of hydraulic pipe bender. At the same time, check whether the advance of mandrel installation is appropriate, and adjust it when it is inappropriate.
2. According to the situation of bending cracks on both sides of the arc-shaped pipe, the reason should be analyzed in detail. It should be ensured that the pipe fittings have excellent heat treatment process early. The welding of seamless steel pipe with seams does not have to be in the bearing direction of F1 and F2, that is, it does not have to face the clamping die and bending wheel die; Check whether the working pressure of the clamping die is very large after the elements of the pipe fittings are, and adjust it to make the working pressure moderate. Is it just because of the harm of external force for a long time that the spiral blade will become soft.
