Plastic mold: several commonly used die repair method
Laser overlaying repair laser welding is a kind of welding with laser beam as heat source focusing on large power coherent monochromatic photon stream. The welding methods usually include 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 penetration is not stronger than electron beam welding. Precise welding can be realized by precise energy control during laser welding. It can be used in many metals, especially for welding difficult metals and dissimilar metals. At present, it has been widely used in mold repair.
, graphite block wrapped with cotton and polyester cotton. Wear work, power supply module is adjusted to an appropriate voltage, and make the full penetration plating pen with relative velocity in the repaired surface of the workpiece and the movement, and to maintain a certain pressure, until the formation of metal deposited layer uniform ideal so far. The plating pen and fixed workpiece surface contact parts, metal plating in ionic liquid under the action of electric field force to the workpiece surface diffusion, obtain electron reduction into metal atoms on the surface, and the metal atoms deposited crystallize coating, which is repairing plastic mold cavity working surface to obtain uniform deposition the layer is needed.
Mold plays a very important role in modern industry, and its quality decides the quality of product directly. To improve the precision and service life of mould, shorten the mould manufacturing cycle, many enterprises urgently need to solve technical problems, but in tooling process often collapse angle, deformation, wear, or even broken failure form. Therefore, the repair of the mold is also necessary. There are many ways to repair dies, such as EDM, argon arc welding, laser overlaying and brush plating. The argon arc welding repair uses the arc which is continuously sent between the welding wire and the workpiece as the heat source, and is welded by the gas protection arc ejected by the welding torch nozzle. At present, argon arc welding is a common method and can be applied to most major metals, including carbon steel and alloy steel. Metal inert gas welding for stainless steel, aluminum, magnesium, copper, titanium, zirconium and nickel alloy, due to low prices, is widely used in mold repair welding, but the disadvantages of the welding heat affected area, solder joints, the precision mold repair has been gradually replaced laser welding repair. Brush plating brush plating technology is the use of a special DC power supply equipment, power supply electrode plating, brush plating anode as the anode; power supply is connected with the workpiece, as the cathode. The brush plating pen is usually made of high purity fine graphite block as anode material
