Several common methods to repair die casting molds
Publish Time: 2024-04-23
1. Argon arc welding repair
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 ejected from the welding 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. Melted extremely inert gas shielded welding is suitable for stainless steel, aluminum, magnesium, copper, titanium, zirconium and nickel alloys. Due to its low price, it is widely used for mold repair welding. However, it has shortcomings such as large welding heat-affected area and large solder joints. Currently, it is used in Precision mold repair has been gradually replaced by laser welding.
2. Brush plating repair
Brush plating technology uses a special DC power supply equipment. The positive electrode of the power supply is connected to the plating pen and serves as the anode during brush plating. The negative electrode of the power supply is connected to the workpiece and serves as the cathode during brush plating. The plating pen usually uses high-purity fine graphite blocks as the anode. The anode material is a graphite block wrapped in cotton and a wear-resistant polyester-cotton cover. When working, the power supply component is adjusted to the appropriate voltage, and the plating pen immersed in the plating solution is moved at a certain relative speed to the part where the surface of the workpiece to be repaired is in contact. 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, the required uniform deposition layer is obtained on the working surface of the plastic mold cavity to be repaired.
3. Laser surfacing repair
Laser welding is a welding process that uses a laser beam focused by high-power coherent monochromatic photon flow as a heat source. This welding method usually includes continuous power laser welding and pulse 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 power is not as strong as electron beam welding. Laser welding can achieve precise energy control, thus enabling the welding of precision devices. It can be applied to many metals, especially the welding of some difficult-to-weld metals and dissimilar metals. It has been widely used in the repair of molds.
4. Light welding
Light welding uses a laser beam focused by high-power coherent monochromatic photon flow as a heat source for welding. This welding method usually includes continuous power laser welding and pulse 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 power is not as strong as electron beam welding. Laser welding can achieve precise energy control, thus enabling the welding of precision devices. It can be used for many metals, especially for the welding of some difficult-to-weld metals and dissimilar metals. It has been widely used in the repair of molds.
