Repair molds should be cautious, and do not act rashly if you are not sure. The reason is that once the mold conditions are changed, it can no longer be remodeled and restored to the original state, and it is not certain that it will be repaired indiscriminately. Therefore, it is necessary to repair the mold, but it also needs to be used in the correct way. There are many ways to repair the mold, such as electric spark process, argon arc welding repair, laser surfacing technology, electric brush plating method and so on.
Argon arc welding repair
The welding is carried out by using the arc burning between the continuously fed welding wire and the workpiece as the heat source, and the gas shielded arc sprayed from the welding torch nozzle. At present, argon arc welding is a commonly used method, which can be applied to most major metals, including carbon steel and alloy steel. MIG welding is suitable for stainless steel, aluminum, magnesium, copper, titanium, zirconium and nickel alloys. Because of its low price, it is widely used for mold repair welding, but it has disadvantages such as large welding heat affected area and large solder joints. Precision mold repair has been gradually replaced by laser welding.
Brush plating repair
Brush plating technology uses a special DC power supply device. The positive pole of the power supply is connected to a plating pen as the anode during brush plating; the negative pole of the power supply is connected to the workpiece as the cathode during brush plating. The plating pen usually uses high-purity fine graphite blocks as the cathode. The anode material, the graphite block is wrapped with cotton and a wear-resistant polyester cotton sleeve.
When working, the power supply assembly is adjusted to the appropriate voltage, and the plating pen is soaked in the plating solution at a certain relative movement speed at the contact part of the surface of the repaired workpiece. The metal ions in the plating solution diffuse to the workpiece under the action of the electric field force. On the surface, the electrons obtained on the surface are reduced to metal atoms, so that these metal atoms are deposited and crystallized to form a coating, that is, to obtain the required uniform deposition layer on the working surface of the plastic mold cavity to be repaired.
Laser surfacing repair
Laser welding is a welding in which a laser beam is used as a heat source by focusing on a high-power coherent monochromatic photon stream. This welding method usually includes continuous power laser welding and pulsed power laser welding. The advantage of laser welding is that it does not need to be carried out in vacuum, but the disadvantage is that the penetration is not as strong as electron beam welding. Accurate energy control can be carried out during laser welding, so that the welding of precision devices can be realized. It can be applied to many metals, especially to solve the welding of some difficult-to-weld metals and dissimilar metals. It has been widely used for mold repair.
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