1.  The equipment runs smoothly, and the specification and use of grinding needles are standardized to make the product more precise. The hole size of the mold is detected by a profile recorder and a pore size measuring instrument, and the surface finish is checked with a microscope dedicated to checking the wire drawing die. However, many domestic manufacturers are still using outdated equipment and using manual operations to grind the hole pattern. Therefore, there are the following problems: the parameters of the hole pattern fluctuate 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, which makes the wire produce secondary compression in the sizing area, increases the external friction, shortens the length of the sizing area, and shortens the service life of the mold; the repair frequency of the worn grinding needle varies from person to person. Non-standard, resulting in poor consistency of hole pattern. The detection method is also backward, and can only be detected by visual inspection or simple tools such as magnifying glass and microscope, and the focus is on the surface finish of the mold, and the hole size cannot be effectively detected, let alone controlled. 2. Selection of drawing die with good pass design The pass of drawing die is generally divided into curve (ie R-type series) and linear type (ie cone-type series). From the perspective of the uniform deformation of the wire in the wire drawing die, it seems that the curved type is better than the straight type. This hole type is designed under the theoretical guidance of "smooth transition". Area", "lubrication area", "work area", "sizing area", "sunrise area" five parts, the junction of each part requires "chamfering", smooth transition, grinding the entire hole shape into a large , The mold with the hole type of the solitary face with different curvatures is still applicable under the conditions of the drawing speed at that time. From the end of the 1970s to the early 1980s, with the increase of the wire drawing speed, the service life of the wire drawing die became a prominent problem. In order to meet the requirements of high-speed cable, T.Maxwall and EGKennth of the United States put forward the "straight line" theory. The theory focuses on the lubrication and wear factors in the drawing process, and points out that the improved linear wire drawing die hole type should have the following characteristics: (1) The longitudinal section lines of each part of the hole type must be accurate It is straight, and the drawing force of the straight working cone surface is the smallest; (2) The junction of each part of the mold must be most obvious, so that each part can fully play its role, avoiding the transition angle to the sizing reduction of the actual length of the zone; (3) Extend the height of the entrance area and the working area, so that the wire rod enters the middle section of the working cone of the die hole, and uses the wedge-shaped area formed by the entrance cone angle and the upper half of the working cone angle to establish a "wedge effect", forming a denser wire surface. A firm lubricating film reduces wear and is suitable for high-speed drawing; (4) The sizing area must be perfectly straight and of reasonable length. If the sizing area is too long, the friction force of the wire will increase, and it is easy to cause diameter reduction or wire breakage after the wire is pulled out of the die hole. If the sizing area is too short, it is difficult to obtain a wire with stable shape, accurate size and good surface quality. It will wear out very quickly. After practical application, the wire-pulling die designed by the linear theory has a service life that is 3-5 times longer than that of the R-type wire-pulling die. 3. The installation and use of the wire drawing machine equipment should be reasonable (1) The installation foundation of the wire drawing machine should be very stable to avoid vibration; (2) During installation, the drawing axis of the wire should be adjusted to be symmetrical with the center line of the die hole, so that the wire and the The stress of the wire drawing die is uniform; (3) During the wire drawing process, avoid frequent starting and stopping, 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 die. Fourth, the wire used for drawing should be pretreated (1) Surface pretreatment: For the wire with dirty surface and many impurities, it should be cleaned and dried before drawing; for the surface with more impurities Wire rods with oxide skin should be acid-fine, dried and then drawn; for wires with peeling, pitting, heavy peeling and other phenomena on the surface, they should be ground by a polisher before drawing; (2) Heat treatment: For the wire with excessive hardness or uneven hardness, the hardness should be reduced by annealing or tempering first, and the wire should maintain good hardness uniformity before drawing. 5. Maintaining a suitable drawing area reduction rate The carbide wire drawing die itself has the characteristics of hard and brittle. If it is used for drawing with a large area reduction rate, it is easy to cause the die to withstand the stress and be broken and scrapped. Therefore, According to the different mechanical properties of the wire, select the appropriate area reduction ratio for drawing. When drawing stainless steel wire with a cemented carbide die, generally the surface shrinkage rate of a single pass does not exceed 20%. 6. Use a lubricant with good lubricating properties During the drawing process, the quality of the lubricant and whether the supply of the lubricant is sufficient will affect the service life of the wire drawing die. Therefore, it is required that the lubricant oil base is stable, has good oxidation resistance, has excellent lubricity, cooling and cleaning properties, and always maintains the best lubricating state throughout the production process, so as to form a layer that can withstand high pressure without The damaged film reduces the friction in the working area and increases the service life of the mold. During the use process, the condition of the lubricating oil should be continuously observed. If serious discoloration or metal powder in the lubricating oil is found, it should be replaced or filtered in time to avoid the lubricating performance of the lubricating oil being reduced due to oxidation, and at the same time to avoid the small falling off during the drawing process. Metal particles damage the mold. 7. Regular maintenance and repair of the wire drawing die During the long-term use of the wire drawing die, the die wall is subjected to strong friction and scouring by the metal wire, which will inevitably cause wear and tear. The most common is the annular groove at the entrance of the wire in the working area. (dent). The appearance of the ring groove of the wire-pulling die aggravates the wear of the die hole, because the small particles of the core material that are peeled off due to loosening on the ring groove are brought into the working area and the sizing area of the die hole by the metal wire, which play the role of abrasive, and enter The wire of the die hole aggravates the wear of the die hole like a grinding needle. If it is not replaced and repaired in time, the ring groove will continue to expand at an accelerated rate, making repair more difficult, and there may even be cracks in the deeper part of the ring groove, causing the mold to be completely broken and scrapped. Regular maintenance and repair of the wire drawing die During the long-term use of the wire drawing die, the die wall is subjected to strong friction and erosion by the metal wire, which will inevitably cause wear. mark). The appearance of the ring groove of the wire-pulling die aggravates the wear of the die hole, because the small particles of the core material that are peeled off due to loosening on the ring groove are brought into the working area and the sizing area of the die hole by the metal wire, which play the role of abrasive, and enter The wire of the die hole aggravates the wear of the die hole like a grinding needle. If it is not replaced and repaired in time, the ring groove will continue to expand at an accelerated rate, making repair more difficult, and there may even be cracks in the deeper part of the ring groove, causing the mold to be completely broken and scrapped. Regular maintenance and repair of the wire drawing die During the long-term use of the wire drawing die, the die wall is subjected to strong friction and erosion by the metal wire, which will inevitably cause wear. mark). The appearance of the ring groove of the wire-pulling die aggravates the wear of the die hole, because the small particles of the core material that are peeled off due to loosening on the ring groove are brought into the working area and the sizing area of the die hole by the metal wire, which play the role of abrasive, and enter The wire of the die hole aggravates the wear of the die hole like a grinding needle. If it is not replaced and repaired in time, the ring groove will continue to expand at an accelerated rate, making repair more difficult, and there may even be cracks in the deeper part of the ring groove, causing the mold to be completely broken and scrapped.