Wire drawing die is a very important consumable product used by various metal wire manufacturers to draw wires. The application range of metal wire drawing dies is very wide, mainly used for drawing straight and difficult-to-machine objects such as bars, wires, pipes, etc., and generally suitable for drawing processing operations of metal and alloy materials such as steel, copper, tungsten, molybdenum, etc. Since the cost of the carbide wire drawing die can reach more than 1/2 of the wire drawing cost, how to reduce the consumption cost of the wire dies and increase its service life has become the primary problem.
We shall discuss this problem today.
1.The wire used for drawing must be pretreated.
The wire with dirty surface and impurities should be cleaned and dried before drawing;
Wires with a lot of oxide scale on the surface must be acidified and dried before drawing;
For wires with peeling, pits, heavy leather, etc. on the surface, they must be polished by a grinder and then drawn;
(2) Heat treatment: For wires with excessive hardness or uneven hardness, the hardness should be reduced by annealing or tempering first, and the wire can be drawn after maintaining good hardness uniformity.
2.Maintain a proper drawing surface shrinkage rate
Cemented carbide wire drawing dies have the characteristics of being hard and brittle. If they are used for shrinking drawing with large area shrinkage, it is easy to cause the die to bear the stress and easily break and scrap.
Therefore, we should select the appropriate area shrinkage for drawing according to the different mechanical properties of the wire.
Generally, the single-pass surface shrinkage rate should not exceed 20% when using tungsten carbide wire guide dies to drawing the stainless steel wire.
3. Use lubricants with good lubricating properties
During the drawing process, the quality of lubricant or wire drawing powder and the supply of wire-drawing lubricants all affect the service life of the drawing die. Therefore, the lubricant is required to have a stable oil base, good oxidation resistance, excellent lubricity, cooling and cleaning properties, and always maintain the best lubrication state throughout the production process.
During use process, we should observe the condition of the lubricating oil constantly. If severe discoloration or increase of 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 from being degraded due to oxidation, and to avoid the small particles falling off during the drawing metal particles damage the mold.
4. Regular maintenance and repair of drawing dies
In the process of long-term use of the wire drawing TC dies, the die wall is subjected to strong friction and erosion of the metal wire, which will inevitably produce abrasion. The most common one is the annular groove (dent) at the wire entrance in the working area.
If it is not replaced in time for repair, the ring groove will continue to expand rapidly, 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.
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