Wire drawing dies are a key tool for wire and cable production in the wire and cable industry, which plays an important role in achieving continuous stretching and ensuring product quality. To maximize the service life of the drawing die and obtain high-quality drawn products, it is necessary to consider not only the material of the wire die, but also the hole design and other conditions of use of the drawing die. With the wide application of high-speed drawing machine, the life problem of iw drawing die is becoming increasingly prominent. In order to prolong the service life of the wire drawing die, in addition to selecting the right material and reasonable hole size, improving the drawing die manufacturing level to meet the process requirements, it is also necessary to determine a reasonable pass compression rate, improve the use conditions, and carry out regular drawing die maintenance. The wire drawing die should be cleaned and replaced regularly and ensure that good lubrication is maintained during the stretching process.
In long-term use, the wire die wall of the drawing die will be subjected to strong friction and erosion of the metal wire, resulting in wear. One of the most common forms of wear is the formation of annular grooves at the bottom of the work area. The appearance of annular grooves exacerbates the degree of wear of the die holes. Because the loose core material in the groove is small particles, the metal wire will be carried into the die hole working area and sizing area, playing the role of abrasive, and the metal wire accelerates the wear of the die hole like a grinding needle. If not replaced and repaired in a timely manner, the groove will continue to expand, making repair work more difficult, and may even lead to cracks in the deeper grooves, making the drawing die unusable.
As a rule of thumb, it is very cost-effective to establish standardized maintenance standards and regularly overhaul the wire drawing dies. Once the drawing die is slightly worn, polishing in time can restore the drawing die to its original polished state more quickly, and the hole size of the drawing die has not changed significantly.
The use of stretching equipment also has a significant impact on the life of the tool under specific stretching process conditions. The asymmetry between the tensile axis of the wire and the center line of the die hole can lead to uneven stress on the wire and drawing die, and the impact caused by mechanical vibration will also subject the wire and drawing die to higher stress peaks, both of which will accelerate the wear of the die.
Especially for hand-inlaid wire drawing dies, if there is a significant shift in the centerline of the drawing die, it will exacerbate the expansion of the die hole and lead to uneven wear, making the die hole oval. In addition, frequent stops can also increase the wear and tear of the tool, because the tensile stress generated during the start of the drawing is greater than the friction generated during the normal drawing.
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