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The one hand, depends on the quality of their own, on the other hand also depends on the stretching conditions

(A) the influence of the reduction rate
In the stretching process; cable model generated on the metal line pressure, while the metal lines in the deformation of wire die wall also generates a counter pressure. The larger the reduction ratio used in the stretching, the pressure generated by the hole wall of the metal wire is also stronger, while the reaction force generated by the metal wire on the hole wall also increases, this force, such as greater than the tensile capacity of the mold itself, cable model will crack.

(B) the influence of the lubricant
In the stretching process, the quality of the lubricant and lubricant supply adequately affect the service life of the PULL mode. Lubricant having a lubricating effect in the PULL process, the cooling effect, the cleaning effect and anti-rust effect.

(C) the influence of the quality of the surface of the metal blank
 If oxide layer of the surface of the metal blank, sand or other impurities adversely affect the service life of the cable model. Because of oxidation of the metal surface layer of hard and brittle when the metal blank through a die orifice, it will be caused by like abrasive PULL die bore soon wear and scratch the surface. Before stretching it pickling off; blanks stacked to note the neat stacking space, to avoid the sand and other impurities contact.