The brush plating technology uses a special DC power supply device. The positive electrode of the power supply is connected with a pen as the anode during brush plating. The negative electrode of the power supply is connected to the workpiece as the cathode during brush plating. The plated pen is usually made of high-purity fine graphite block. Anode material, the graphite block is covered with cotton and a wear-resistant polyester cotton sleeve. Mold has an extremely important role in modern industry, and its quality directly determines the quality of the product. Improve the life and accuracy of the mold. Shortening the manufacturing cycle of the mold is a technical problem that many enterprises urgently need to solve, but in the process of using the mold, there are often failure modes such as collapse angle, deformation, wear, and even breakage.
Although mold design is carried out under the expected process conditions when selecting molding materials and molding equipment, people's understanding is often imperfect. Therefore, after the mold processing is completed, the mold test must be carried out to see the molded parts. How is the quality? It is always found that after the erroneous revision is carried out.
There are many types of defects in plastic parts, and the reasons are also very complicated. There are mold reasons and process conditions, and the two tend to be together. Before the mold is repaired, it should be carefully analyzed according to the actual situation of the defective phenomenon of the plastic parts, and the remedy method should be proposed after finding out the cause of the defects of the plastic parts. Since the molding conditions are easily changed, it is common practice to change the molding conditions first, and when the molding conditions cannot be solved, the mold is considered to be repaired.
It is more prudent to repair the mold, and it is not easy to act rashly. The reason is that once the mold conditions are changed, it is impossible to make major modifications and restore the original condition. Therefore, repair of the mold is also necessary. There are many ways to repair molds, such as EDM, argon arc welding, laser surfacing, and brush plating.
Argon arc welding repair
The arc that is burned between the continuously fed wire and the workpiece is used as a heat source, and the gas ejected from the torch nozzle protects the arc for welding. At present, argon arc welding is a commonly used method and can be applied to most major metals, including carbon steel and alloy steel. Melting inert gas shielded welding is suitable for stainless steel "target=_blank> stainless steel, aluminum, magnesium, copper, titanium, zirconium and nickel alloys. Due to its low price, it is widely used in mold repair welding, but the welding heat has a large area and solder joints. Most of the shortcomings have been replaced by laser welding in the field of precision mold repair.
Brush plating repair
The brush plating technology uses a special DC power supply device. The positive electrode of the power supply is connected with a pen as the anode during brush plating. The negative electrode of the power supply is connected to the workpiece as the cathode during brush plating. The plated pen is usually made of high-purity fine graphite block. Anode material, the graphite block is covered with cotton and a wear-resistant polyester cotton sleeve. During operation, the power supply component is adjusted to a suitable voltage, and the plated pen is flooded with the plated pen at a certain relative moving speed at a portion where the surface of the workpiece is contacted, and the metal ions in the plating solution are diffused to the workpiece by the electric field force. On the surface, electrons are reduced on the surface to form metal atoms, so that these metal atoms are deposited and crystallized to form a coating, that is, a uniform deposited layer is obtained on the working face of the plastic mold cavity to be repaired.
Laser surfacing repair
Laser welding is a process in which a laser beam is used as a heat source by focusing with a high-power coherent monochromatic photon stream. This welding method usually has 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. The disadvantage is that the penetration force is not as strong as that of electron beam welding. Accurate energy control during laser welding enables precision soldering of devices. It can be applied to many metals, especially to weld some difficult-to-weld metals and dissimilar metals. It has been widely used in the repair of molds.
Light welding is performed by focusing a high-power coherent monochromatic photon stream to obtain a laser beam as a heat source for welding. This welding method usually has 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. The disadvantage is that the penetration force is not as strong as that of electron beam welding. Accurate energy control during laser welding enables precision soldering of devices. It can be used for many metals, especially for the welding of difficult-to-weld metals and dissimilar metals. It has been widely used in the repair of molds.
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