Mold cleaning is a key process in mold maintenance and maintenance, and it is also a bottleneck restricting mold maintenance. Because the mold manufacturing development speed is much faster than the mold cleaning speed, and the mold is quickly cleaned and ready for the next production, the time left for the mold cleaning is quite limited. Through the investigation of the factory, it was found that the molds arranged in the corridors and workshops in the factory almost occupied the limited operation space of the workshop, just waiting to be cleaned.

Some companies reset the mold directly after a production has been completed without any cleaning process and continue to be used for reproduction. If the plastic parts produced are clean, then there is no problem with the operation of the mold. Over time, a “temporary fire-fighting” cultural concept will be formed inside the company. Only when the residue accumulated in the mold affects the quality of the part or the mold is worn, the mold needs to be cleaned, and the cleaning process is only passed along. .

In the case of cleaning and repairing molds, some factories employ some apprentices in the primary mechanic or mold shop to do some cleaning of molds and stencils, and then the molds and stencils are split by the service technician. But in fact, the cleaning of the mold and the template will also wash away the track mark, which makes it difficult for maintenance technicians to find and correctly repair the defects of the mold and parts.

Indeed, cleaning molds does not require the talent of a senior mold making technician, but it is completely unthinkable for a newcomer who is not familiar with the special functions and defects of the mold or who are unclear about the key sealing area characteristics of the mold to be responsible for mold cleaning. Decide. Unreasonable distribution of mold cleaning work will result in continuous production of molds with performance defects, and will also increase significantly due to increased joints, burrs, corners, premature plating or steel shifting and mold mixing. The budget of the mold. Such problems often originate from the “temporary fire-fighting” maintenance culture, never monitoring or accounting for defects and identifying the root cause of the problem.

Standardized cleaning procedure

Systematic mold maintenance is based on the consistency of maintenance requirements and maintenance operations. In order to achieve the "cost-effective" goal, cleaning molds must be careful: develop a detailed mold cleaning program. When cleaning different parts of the mold, such as internal cleaning of the press, wiping along the edge, regular cleaning, and main cleaning, the cleaning operation method is also different.

After a certain period of operation of the mold and after visual inspection of plating wear, track marks, and mold residue content in the venting and non-venting areas, the technician can determine the procedure and frequency of mold cleaning by visual inspection. Therefore, it is important to understand the cycle of safe operation of the mold and to document the observations of residual residue and wear inside the mold.

Based on the mold's operating cycle, all molds should be accompanied by documentation of the relevant maintenance procedures and maintenance intervals. In general, controlling the internal grease level and gear broaching, sliders, internal pin and bushings, and other moving parts are key to ensuring stable production. Other factors affecting production include contamination or blockage of water lines and sprinklers, leakage of manifolds, rust and corrosion due to water leakage or condensation.

What level of cleaning is enough?

Usually, when the molding process is completed, it tends to leave dirt or residue on the mold (having certain chemical composition and physical properties). The final cleaning requirements are different for different types of residues. Resins such as polyvinyl chloride produce hydrogen chloride gas, which can corrode many types of die steel.

Some other residues are separated from the flame retardant and the antioxidant, which can cause corrosion to the steel. There are also some pigment colorants that rust the steel and the rust is difficult to remove. Even ordinary sealed water, if placed on the surface of an untreated mold for a long time, will also cause damage to the mold.

Therefore, the mold should be cleaned as necessary according to the established production cycle. Each time the mold is removed from the press, it is first necessary to open the mold vents to remove all oxidizing dirt and rust from the mold and non-critical areas of the stencil to prevent it from slowly corroding the steel surface and edges. In many cases, even after cleaning, some uncoated or rust-prone mold surfaces will soon appear rust again. Therefore, even if it takes a long time to brush the unprotected mold, the surface rust cannot be completely avoided.

Many molds now have "self-cleaning" vent lines that have a high gloss. By cleaning and polishing the vents to the extent of SPI#A3, or by milling or grinding, the residue is discharged to the waste area of ​​the vent line to prevent residue from adhering to the surface of the roughing stand. . However, if the operator manually grinds the mold with a coarse brushing pad, emery cloth, sandpaper, grindstone or a brush with nylon bristles, brass or steel, it will cause excessive “cleaning” of the mold.

Generally, when hard plastic, glass beads, walnut shells, and aluminum pellets are used as abrasives to perform high-pressure pulverization cleaning on the surface of the mold, if the abrasive is used too frequently or improperly used, the grinding method also makes the mold The surface creates pores and tends to adhere to the residue, resulting in more residue, wear, or premature rupture or burrs of the mold, which is more detrimental to the cleaning of the mold.

Therefore, by finding a cleaning device suitable for the mold and the processing process, and referring to the cleaning method and the cleaning cycle recorded in the archive file, it is possible to save more than 50% of the repair time and at the same time effectively reduce the wear of the mold.

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