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How to increase the service life of drawing die

How to increase the service life of drawing die

  • Categories:Company News
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  • Time of issue:2020-03-10
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(Summary description)At present, the grinding process of wire drawing dies abroad generally adopts high-speed mechanical grinding machines and metal grinding needles coated with cemented carbide. The equipment runs smoothly, and the specifications and use of grinding needles are standardized to make the product more accurate.

How to increase the service life of drawing die

(Summary description)At present, the grinding process of wire drawing dies abroad generally adopts high-speed mechanical grinding machines and metal grinding needles coated with cemented carbide. The equipment runs smoothly, and the specifications and use of grinding needles are standardized to make the product more accurate.

  • Categories:Company News
  • Author:
  • Origin:
  • Time of issue:2020-03-10
  • Views:0
Information

1. Try to use high-quality carbide drawing dies produced by advanced mold processing technology, or diamond drawing dies

At present, the grinding process of wire drawing dies abroad generally adopts high-speed mechanical grinding machines and metal grinding needles coated with cemented carbide. The equipment runs smoothly, and the specifications and use of grinding needles are standardized to make the product more accurate. The hole size of the mold is detected by a profile recorder and aperture measuring instrument, and the surface finish is checked with a microscope for checking the wire drawing mold. Many domestic manufacturers still use backward equipment and use manual operations to grind the hole pattern. Therefore, there are the following problems: the hole parameter fluctuates greatly, and it is difficult to process a straight working cone; the intersection of the sizing area and the working area It is easy to grind out the transition angle, so that the wire produces secondary compression in the sizing area, increases external friction, shortens the length of the sizing area, and shortens the service life of the mold; the frequency of repair of worn grinding needles varies from person to person. Non-standard, resulting in poor consistency of the hole pattern. The detection methods are also backward. They can only rely on visual inspection or simple tools such as a magnifying glass and a microscope. The focus is on the surface finish of the mold. The hole size cannot be effectively detected, let alone controlled.

Second, choose a drawing die with a good hole design

Drawing die hole type is generally divided into curve (ie R type series) and straight type (ie cone type series).

From the perspective of the uniform deformation of the wire rod in the drawing die, it seems that the curve type is better than the straight type. This hole type is designed under the theoretical guidance of "smooth transition", and its hole structure can be divided into "population" according to the nature of the work. Zone", "lubrication zone", "work zone", "sizing zone", "sunrise zone", the junction of each part requires "chamfering", smooth transition, grinding the entire hole pattern into a large 3. The mold of this type of hole with orphan faces with different curvatures is still applicable under the conditions of drawing speed at that time. From the late 1970s to the early 1980s, with the increase in wire drawing speed, the service life of wire drawing dies became a prominent problem. In order to meet the requirements of high-speed wire drawing, T. Maxwall and E.G. Kennth of the United States proposed the "linear" theory. The theory focuses on the lubrication and wear factors in the drawing process, and points out that the improved linear drawing die hole type should have the following characteristics:

(1) The longitudinal section lines of each part of the hole pattern must be straight, and the straight working cone surface has the smallest pulling force;

(2) The junction part of each part of the mold must be obvious, so that each part can fully exert its own role, avoiding the reduction of the actual length of the sizing area by the transition angle;

(3) Extend the height of the entrance area and working area so that the wire enters the middle section of the working cone of the die hole. Using the wedge area formed by the entrance cone angle and the upper half of the working cone angle, a "wedge effect" is established to form a denser wire surface Strong lubricating film, reduce wear and tear, suitable for high-speed drawing;

(4) The sizing area must be straight and of reasonable length. If the sizing area is too long, the friction of the wire will increase. After the wire is pulled out of the die hole, it will cause shrinkage or wire breakage. If the sizing area is too short, it will be difficult to obtain wire with stable shape, accurate size and good surface quality. Will wear out very quickly.

After practical application, the service life of the wire drawing die designed by the linear theory is increased by 3-5 times compared with the R-type wire drawing die.

Third, the installation and use of wire drawing machine equipment should be reasonable

(1) The installation foundation of the wire drawing machine needs to be very stable to avoid vibration;

(2) During installation, the tension axis of the wire is symmetrical to the center line of the die hole through debugging, so that the stress of the wire and the wire die is uniform;

(3) Avoid frequent starting and stopping during the wire drawing process, because the friction caused by the tensile stress at the start of drawing is much larger than the friction during normal drawing, which will inevitably increase the wear of the mold.

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