The influence of tensile conditions on the drawing die service life

On the one hand depends on the quality of itself, on the other hand also depends on tensile conditions ( A) The influence of the reduction rate in the process of drawing,; Drawing die for metal line pressure, and at the time of the deformation of the wire on the wall of anchor also produced a negative pressure. Stretch when used in the greater the reduction rate, wall of hole on the metal line pressure is stronger, the reaction force on the hole wall of metal wire is enhanced, such as the force is greater than the tensile ability of mold itself, the guy die would have been split. ( 2) Lubricant in drawing process, the influence of the quality of the lubricant and lubricant supply is fully all influence the service life of die. Lubricant during drawing has the lubrication, cooling, cleaning and antirust function. ( 3) Metal billet surface quality of billet surface oxide layer, sand or other material, if any, adverse influence on the drawing die service life. Because the metal oxide layer on the surface of the hard and brittle, when metal blank by die, it can cause drawing die die soon as abrasive wear and scratches the surface. So before stretching, must pickling it out; When stock pile up, pay attention to the yard clean and tidy, avoid contact with sand and other impurities. The characteristics of the sliding drawer: ( 1) Wire and ground wheel slide between the two, so want to be wear and tear, so it is mainly used for copper wire drawing with moderate intensity. ( 2) Tension control is sensitive, simple drive system, electric control requirement is very strict. ( 3) The total working rate is large, suitable for plastic metal wire drawing. ( 4) Tensile rate is high. ( 5) Easy to realize mechanization and automation.