The wear rate of drawing die can be reduced by optimizing the hole of the drawing die, and the service life of the drawing die can be prolonged. With the same specifications of wire drawing die at home than abroad dies the length of the work area is generally much longer. Because in the process of drawing wire first contact with the core district of import, import cone angle is small, not only increase the contact area between the wire and the inner hole, so as to increase the friction force and prevent the run slip agent into, the drawing process of lubrication effect becomes worse, serious impact on the mold service life. The short sizing belt is easy to cause the product's size is super poor, and the drawing die soon wear out. The long narrow working area can reduce the gap between the wire and the drawing die, which can force more lubricant into the middle of the wire and the middle of the hole under the pressure, thus resulting in better lubrication pressure. From the inner hole out of the wire temperature is low, the drawing force decreases, the metal in the drawing process is more average, is conducive to the progress of the drawing speed and the improvement of the surface quality of wire.
Produced from Germany drawing die with the Xiangtan Iron and steel production drawing die wear curve comparison shows that, two kinds of wire drawing die under the premise of the same drawing: workpiece material: No. 65 steel wire; drawing speed: 3.64M / S; drawing with lubricant: soap powder; coating on the surface of the drawing the sulfate acid pickling, phosphating, coating borax. And the import of foreign products, wire drawing die angle is increased, effectively avoid abrasion of wire and wire drawing die, and into the more lubricant, lubricating effect is enhanced, decreases the abrasion of core. Therefore, it is very important for the development of wire industry in our country to make the groove optimization of drawing die, to advance the precision of drawing die, and to save the production cost. This change improves the surface quality of the wire, but also improves the service life of the wire drawing die.
Compared with foreign products, the domestic drawing die blank has the following significant deficiencies: 1. The German service life of dies production is 2.72 times higher than the service life of die Xiangtan Steel production. There was no significant area of the fixed diameter. Significant and flat sizing area can produce high precision and high surface quality of wire, but also conducive to reduce wear and tear, greatly improve the service life of wire drawing die. The longer working area is advantageous to the reduction of the friction force and the average distribution in the drawing process, reduce the wear of the inner hole of the wire drawing die, and advance the service life of the die. Sizing area is the final link to determine the ultimate size of the wire, the short and not straight line will directly affect the ultimate quality of the wire. Short working area. In addition, this type of work area is designed to prevent the lubricant from exiting from the inlet end of the wire drawing die. The test results show that the structure of the drawing die has a great influence on the use of the drawing die. Because the working area is short, the effective use of the area is smaller, which not only increases the friction, but also increases the wear and tear, and increases the cost of investment.
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