After using the mold for a long time, the cutting edge must be ground, and the cutting edge surface should be demagnetized after grinding, otherwise, it is easy to block the material. Enterprises should carry out lubrication, cleaning, rust prevention, and other treatment after using the mold, so as to shorten the test time of the mold and improve production efficiency. In addition, under the condition of injection molding machine, mold the normal operation, all kinds of mold test performance, and finally forming parts size measured, through which information can determine the existing state of mold, find out the cavity, core, cooling system, and parting surface damage, according to the information provided by the plastic, can judge the mold damage status and maintenance measures.
In the use of the process，the punch of mold is easy to break, bend and gnawed, the punch is generally gnawed. The damage of punch and punch sleeve is generally replaced with the same specification of parts. Fastening the parts, check whether the fastening parts were loose and damaged, the best way is to find the same specification of parts for replacement.
In addition, during maintenance, check whether the parts of the relationship between the damaged parts, repair the damaged parts, pneumatic jacking check whether there is leakage phenomenon, and take measures for the specific situation. Several important parts of the mold should be tracked and tested: whether the mold ejector pins and leader pins are lubricated, whether deformation and surface damage occurs, once found, they should be replaced in time; Attention should be paid to the protection of the elastic strength of the bearing part of the gear and rack mold and the spring mold, so as to ensure that it is always in the best working condition; Strengthen the cleaning of the runner, for the hot runner mold, heating, and control system maintenance is conducive to prevent the occurrence of production failures.