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What is the effect when applying back-pull on wire drawing die? During the stretching process, a certain back tension is applied to the wire, which reduces the radial compressive stress at the entrance of the mold, reduces the frictional stress, eliminates the annular groove at the entrance of the mold, and reduces the average wear of the mold. At the same time, the reasonable reverse tension makes the stretching axis coincide with the center line of the die hole, eliminating the vibration and runout of the wire, and causing the asymmetric uneven wear of the mold.cut back. However, the excessive pulling force will reduce the tensile strength of the wire after stretching, causing shrinkage or broken wire.