how to repair molds carefully, and what are the main repair methods?
mold plays an extremely important role in modern industry, and its quality directly determines the quality of the product. improving the service life and accuracy of molds and shortening the manufacturing cycle of molds are technical problems that many companies urgently need to solve. however, in the process of mold use, there are often problems such as collapse, deformation, wear, and even breakage that need to be repaired.
repair molds should be cautious, not to act rashly if you are not sure. the reason is that once the mold conditions are changed, it cannot be remodeled and restored to the original state, and there is no certainty that the repair will become worse. therefore, the repair of the mold is necessary, 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 torch nozzle. at present, argon arc welding is a commonly used method and 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. anode material, graphite block is wrapped with cotton and 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 deposit and crystallize to form a coating, that is, to obtain the required uniform deposition layer on the working surface of the repaired plastic mold cavity.
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 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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