Improve the service life and precision of the mould. Shorten the manufacturing cycle of the mold, many enterprises need to solve the technical problems, but in the process of mold use often appear collapse angle, deformation, wear, and even break the form of failure. Therefore, it is necessary to repair the mold. Many methods of repairing mold, such as electric spark process, argon arc welding repair, laser welding technology, brush plating method. Analysis and research, find out the cause of the plastic parts defect after the remedy. Because the molding conditions are easy to change, so the general practice is to change the molding condition, when the change of molding conditions can not solve the problem, only consider repair mold. Mould repair should be careful, not sure not to act rashly. The reason is that once the mold conditions changed, it can not be a big transformation and restitution. Argon arc welding repair Using the continuous feeding between the wire and the workpiece burning arc as heat source, gas shielded arc welding torch nozzle for welding. Argon arc welding is a common method, which can be used in most of the major metals, including carbon steel and alloy steel. Melting 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 welding heat affected area, solder joint defects, at present in terms of precision mold repair has been gradually fill the laser welding and be replaced. Brush plating repair Brush plating technology is the use of a special DC power supply equipment, power supply cathode plating pen, as the brush plating anode; the cathode of the power supply is connected with the workpiece, as brush plating cathode, plating pen is usually used high purity superfine graphite block as the anode material, graphite block wrapped in cotton and wear resistant polyester cotton padded covering. Work and to adjust the power supply components to the appropriate voltage, and dipped in plating liquid coating pen to certain relative velocity were repaired in the parts in contact with the workpiece surface, plating liquid metal ions under the action of electric field force spread to the workpiece surface and get electron reduction to the metal atoms on the surface and the metal atoms deposited crystallization to form a coating, is also were repaired in the plastic mold cavity surface obtained need uniform layer deposition. Laser welding repair Laser welding is a welding using high power coherent monochromatic photon flow focusing and the laser beam is used as the heat source. This kind of welding method usually has continuous power laser welding and pulsed power laser welding. Laser welding has the advantage that it does not need to be carried out in a vacuum, the disadvantage is that the penetration is not as good as the electron beam welding. Precise energy control can be carried out in laser welding, so the welding of precision devices can be realized. It can be used in many kinds of metals, in particular, can solve some difficult to weld metal and dissimilar metal welding. Has been widely used for mold repair. Laser beam welding is a laser beam which is made by using high power coherent monochromatic photon flow focusing and the laser beam is used as the heat source. This kind of welding method usually has continuous power laser welding and pulsed power laser welding. Laser welding has the advantage that it does not need to be carried out in a vacuum, the disadvantage is that the penetration is not as good as the electron beam welding. Precise energy control can be carried out in laser welding, so the welding of precision devices can be realized. It can be used in many kinds of metals, in particular, can solve some difficult to weld metal and dissimilar metal welding. Has been widely used for mold repair.
