How should repair after forming die wear?
The quality precision of molding tool has a direct effect on the molding quality precision of injection molding products.Once the mold is damaged, indentation, wear and tear, the corresponding parts of the product will be displayed.Therefore, when the quality accuracy of the die, it must be repaired in time.
(1) common maintenance methods for molds.
This method is applied to damaged shafts, rods or sets of parts.It is manufactured and replaced by the preparation method since it can not be repaired with serious wear or bending.
For the wear of the cavity forming surface, it can be plated with a hard chromium layer and then ground and polished.
In the case of a pit or local damage, a low-temperature argon arc welding and electric welding pile can be used to repair the missing parts.
The epoxy resin is used to fix the pits on the forming surface with high hardness.
If the hole is not affected, the hole can be enlarged to some size, and then the guide column will be prepared.
It can be machined and milled to damage parts of large mould, and then insert a piece of the same material into metal pieces to reprocess and take shape.
To repair the abrasion of large flat surface, add the steel plate at the bottom of this piece, increase the thickness of this piece, and trim the worn surface to the original thickness.
(2) maintenance examples
The parting surface of the mold is worn, and due to the roughness of the surface, the injection molding of the mould has a flying edge.At this time, the parting surface of the two halves of the mould should be polished, and then the chromium plating method can be used to restore to the original thickness.After grinding, not to use the chrome-plating method, but to deepen the cavity, the core to remove the original surface grinding thickness value.
If there is a crack in the strength, the shape and frame method can be used to tighten the screws tightly.
It can be used to repair the rust of the cavity surface.When the rust is heavier, sand blasting can be used and then polished.When the pit occurs, it should be polished, then chrome plated, and then polished and repaired.
For mold cooling water pipe and mold internal cooling water hole, if the thick scale is produced, the cooling effect can be affected, and the boiler cleaning fluid can be used for cleaning and descaling.After the rust and scale removal, the pressure test shall be carried out. When the water pressure test of 2MPa is used, the water leakage shall be qualified.