How to repair the surface of stainless steel forgings

Forging electroplating is a process that uses the basic principle of electrochemistry to deposit a solid coating on the surface of the forging by direct current in the electrolyte, using the forging as the cathode and the metal as the anode. Forgings shall be degreased, derusted and activated before plating, and purified after plating.

Chromium plating is widely used in forging surface electroplating strengthening technology. The hardness of the chromium plating layer is 900 ~ 1200hv, which can effectively improve the wear resistance of the forging and will not cause deformation of the forging. It is conducive to electroplating strengthening of the forging surface with complex shape. The plating layer is generally 0.03 ~ 0.30mm. This process is only applicable to small drawing dies and plastic dies.

The fatigue cracks on the general parts of the repaired forging shall be removed by pneumatic grinding wheel. After the deep dead corners are removed by arc air gouging, the concave table with a depth of 10mm can be machined on the repaired parts by gas cutting, and then the surface shall be cleaned. In order to prevent cracking after surfacing repair, the surfacing forging shall be preheated (450-500 ° C), cooled slowly after surfacing to prevent cracking, and then tempered immediately. At this time, the hardness of the surfacing part is much higher than that of the mold.

Die surfacing technology can make forging obtain ideal comprehensive performance, reduce remanufacturing cost and prolong service life. Generally, 5000-6000 pieces can be scrapped by cutting edge die cutting for forging, and the one-time service life can be increased by 1-2 times after surfacing. The service life of the hot forging die can be increased by more than one time, and it can be repaired repeatedly.