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, failure modes such as collapse, deformation, wear, and even breakage often occur during mold use. Therefore, the repair of the mold is also necessary. There are many ways to repair molds, such as electric spark process, argon arc welding repair, laser surfacing technology, and brush plating method. 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. However, 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 Anode material, graphite block wrapped with cotton and wear-resistant polyester cotton sleeve. When working, the power supply assembly is adjusted to a suitable voltage, and the plating pen filled with the plating solution moves back and forth on the surface of the repaired workpiece at a certain relative movement speed , And maintain a certain pressure until a uniform and ideal metal deposition layer is formed. As the plating pen is in contact with the surface of the repaired workpiece, the metal ions in the plating solution diffuse to the surface of the workpiece under the action of the electric field force. The obtained electrons are reduced into 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 plastic mold cavity to be repaired.
Laser surfacing repair
Laser welding is welding using a laser beam focused by a high-power coherent monochromatic photon stream as a heat source. 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 a 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.