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How to repair the wire drawing die?

Time:2020-06-01 11:28:57Hits:
According to statistics, China's annual mold consumption in the mechanical processing industry alone is as high as five times the total price of the machine tool. It can be seen that the large consumption of molds not only directly increases production costs, but also causes frequent production shutdowns due to frequent mold replacement, resulting in greater economic losses. Die repair technology can strengthen the life of wire drawing die.
What we need to pay attention to here is that: although the machine will give an alarm when the operation is wrong, it may occasionally burn out pits on the mold surface. Therefore, it is necessary to clarify the specific steps of wire drawing die repair:
1.Clean-up: simple clean-up is required at the repaired area to remove oil and impurities, otherwise there will be poor power supply and spark splashing during the repair process.
2. Rolling rate: the torch rotation speed is suitable for the pulse output current to form tightly arranged fusion points on the supplementary material. The rotation speed should not be too fast, otherwise there will be a small amount of supplementary material peeling and small pores after repair and polishing.

3. The contact point between the welding torch and the mold: the smaller the contact area between the welding torch and the supplementary material, the better the pressure bonding, the greater the instantaneous current density, the greater the heat of the welding point, and the better the combination of the supplementary material.
4. Posture and pressure: it is better that the welding torch and the mold surface be at 45° when repairing, and apply a certain pressure to the welding torch. The pressure is determined according to the roughness of the defect surface.
5. Oxidized surface repair:
1) Before repairing the oxidation mold, the nitride layer must be removed with a power tool, and the supplementary material is directly welded to the steel substrate, otherwise there is an oxide layer between the supplementary material and the substrate, which is easy to peel off.
2) Use low power and thin materials for repairing the edge part as much as possible, which can reduce and reduce the edge marks caused by the repair heat.