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Cómo aprender a limpiar moldes de plástico

2020-03-23

Cualquier producto necesita tener un conocimiento correcto de mantenimiento y los productos de molde no son una excepción. Como proceso clave de mantenimiento y limpieza del molde, tiene un impacto muy importante en el mantenimiento del molde. Jiehui Chuang Xiaobian compartirá algunos conocimientos sobre plásticos en la limpieza de moldes.

clean plastic molds

1. Procedimientos de limpieza estandarizados

Systematic mold maintenance is based on maintenance requirements and continuity of repair operations. In order to achieve the "cost-effective" goal, cleaning the mold must pay attention to: develop a detailed mold cleaning plan. When cleaning different parts of the mold, such as cleaning inside the press, wiping the edges, conventional cleaning, and cleaning of the main parts, the cleaning operation methods used are also different.

Después de que el molde funciona durante un cierto período y después de las pruebas de apariencia, como el desgaste galvánico, las marcas de huellas y el contenido de residuos de molde en áreas ventiladas y no ventiladas, los técnicos pueden determinar el procedimiento y la frecuencia de la limpieza del molde mediante una inspección visual. Por lo tanto, es muy importante comprender el ciclo de funcionamiento seguro del molde y archivar los informes de observación de la acumulación de residuos y el desgaste dentro del molde.

Dado que el molde tiene un cierto ciclo de funcionamiento, todos los moldes deben ir acompañados de los procedimientos de mantenimiento pertinentes y la documentación del ciclo de mantenimiento. En general, controlar los niveles internos de grasa y el brochado de los engranajes, los deslizadores, los pasadores y bujes internos y otras condiciones de funcionamiento de las piezas móviles es la clave para una producción estable. Otros factores que afectan la producción incluyen la contaminación o el bloqueo de las líneas de agua y los chorros de agua, los colectores con fugas, el óxido y la corrosión debido a fugas o condensación.

2. ¿Qué nivel de limpieza es suficiente?

Generally, when the molding process operation is completed, dirt or residues are often left on the mold. For different types of residues, the final cleaning requirements are different. Resins such as polyvinyl chloride generate hydrogen chloride gas, which can corrode many types of mold steel. Other residues are separated from flame retardants and antioxidants and can cause corrosion to steel. There are also pigment stains that rust the steel and the rust is difficult to remove. Even ordinary storage water can cause damage to the mold if it is left on the surface of the untreated mold for too long.

Therefore, the necessary cleaning of the mold should be carried out according to the established production cycle. After each time the mold is removed from the press, the mold air holes need to be opened first to remove all oxidized dirt and rust on the non-critical areas of the mold and the template to prevent it from slowly corroding the surface and edges of the steel. In many cases, even after cleaning, some uncoated or rust-prone mold surfaces will soon show 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. Vent holes are cleaned and polished to the level of SPI # A3, or by milling or grinding, the residue is discharged to the garbage area of ​​the ventilation pipe to prevent the residue from adhering to the surface of the roughing mill stand . However, if the operator manually grinds the mold with a coarse-grained brushing pad, emery cloth, sandpaper, abrasive stone, or brush with nylon bristles, brass or steel, it will cause excessive cleaning of the mold.

Generally, when hard plastics, glass beads, walnut shells and aluminum pellets are used as abrasives for high-pressure crushing and cleaning of mold surfaces, if these abrasives are used too frequently or improperly, this grinding method will also Pores are created on the surface of the mold, and residues are liable to adhere to them, leading to more residue, wear, or premature fracture or burrs of the mold, which is even more difficult to clean the mold.

Therefore, by finding cleaning equipment suitable for the mold processing technology, and referring to the cleaning methods and cleaning cycles recorded in the archives, maintenance time can be saved, and at the same time, mold wear can be effectively reduced.

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