Directional issue in cold drawing of pipes
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I would like to ask everyone: when performing cold drawing, how can one determine which end of the two tubes should be drawn in which direction? Is there any case of simultaneous stretching? Thank you!
I’ve done a lot of cold drawing, but I really didn’t pay attention to the fact that when cold drawing pipes, the direction needs to be taken into account. The design doesn’t specify the direction of cold drawing, but it does specify the location where it should be carried out. I think the location of cold drawing determines its direction, right?
When performing pre-cooling stretching, it is necessary to determine the position based on the compensation zero temperature. Generally, the amount of pre-stretching is half of the compensation amount (at the creep temperature, the cold straining ratio is 0.7; at temperatures where creep does not occur, a cold straining ratio of one-half is sufficient). This should be done in the direction of the tube’s thermal expansion. Relevant information can be found in standards such as \"Pressure Pipeline Technology\", \"Design and Engineering Applications of Pressure Pipeline Systems\", and national textbooks on pressure pipeline approval