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    After the flattening process, the cold-drawn tube needs to be re-rolled. However, during actual use, it was found that the cold-drawn tube is easily scratched. Moreover, the phenomenon of scratches is relatively regular, usually appearing in pairs and in opposite directions. What is the reason for this?
    After analysis, it was found that such regular scratches on the cold drawn pipe may be caused by mis-layering. In order to improve this situation, we instead use rough roller rolling or smoothing to increase the inter-layer friction coefficient of the steel coil, thereby reducing the possibility of mis-layering scratches.

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  Precision boring and rolling tube

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  Precision cold drawn steel pipe

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  Precision cold drawn tube

   
  Since the rewinding is carried out after the flattening process, the outlet purge system of the flattening machine can be improved. This can reduce the remaining impurities on the surface of the product and avoid scratches. In addition, after we refuel the reel, it is best to perform multiple expansion and contraction operations before installing the sleeve. The purpose of this is to prevent the sleeve from being overstrained before use, thereby affecting the processing quality of the cold drawn tube.