When using honed tubes, attention should be paid to: When there is a concave fold on the honed tube, the service life of the component will be affected, and the cylinder parts will also affect the normal operation of the entire system. What exactly causes the concave fold? There are不外乎 these possibilities: First, the reduction in diameter during the cold drawing process is too large or the transition of the steel pipe hammer head is too urgent; Second, the wall thickness of the pipe is uneven, and some parts are too thin; Third, the honing equipment is too old to meet the processing requirements of the pipe. For the concave fold phenomenon of the honed tube, the specific treatment methods are formulated according to the relevant reasons. For example, it is necessary to reasonably distribute the reduction in diameter during the cold drawing process of the honed tube; careful inspections should be carried out in all aspects at ordinary times to avoid defects in the hammer head, pipe materials, etc.; traditional honing equipment should also be replaced. After these improvements, similar defects should be improved.