Análisis De Causa Del Desgaste Del Tornillo De La Máquina De Soplado De Película Ultrafina

Hora de lanzamiento:2025-08-06

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1. Cada tipo de plástico tiene un rango de temperatura de procesamiento de plastificación ideal. Se debe controlar la temperatura de procesamiento del barril para que se acerque a este rango de temperatura. Los plásticos granulares entran en el barril desde la tolva y primero llegan a la sección de alimentación. La fricción seca se producirá inevitablemente en la sección de alimentación. Cuando estos plásticos no se calientan lo suficiente y se derriten de manera desigual, es fácil provocar que aumente el desgaste de la pared interior del barril y la superficie del tornillo. Del mismo modo, en la sección de compresión y en la sección de homogeneización, si el estado de fusión del plástico es desordenado y desigual, también provocará un aumento del desgaste.

2. La velocidad debe ajustarse correctamente. Porque algunos plásticos están reforzados, como fibras de vidrio, minerales u otros rellenos. La fuerza de fricción de estas sustancias sobre el material metálico suele ser mucho mayor que la del plástico fundido. Al moldear por inyección estos plásticos, si se utiliza una alta velocidad, la fuerza de corte sobre el plástico se mejorará al mismo tiempo, y el refuerzo producirá correspondientemente más fibras trituradas. Las fibras trituradas contienen extremos afilados, lo que aumenta enormemente la fuerza de desgaste. Cuando los minerales inorgánicos se deslizan sobre la superficie del metal a alta velocidad, su efecto de raspado no es pequeño, por lo que la velocidad no debe ajustarse demasiado.

3. El tornillo gira en el barril, y la fricción entre el material y los dos hace que la superficie de trabajo del tornillo y el barril se desgasten gradualmente: el diámetro del tornillo disminuye gradualmente y el diámetro del orificio interior del barril aumenta gradualmente. De esta manera, la brecha entre el diámetro correspondiente del tornillo y el barril aumenta poco a poco con el desgaste gradual de los dos. Sin embargo, dado que la resistencia del cabezal de la máquina y la placa de derivación frente al barril no cambia, esto aumenta el flujo de fuga del material extruido cuando avanza, es decir, aumenta el flujo del material desde el espacio de diámetro hasta la dirección de alimentación. Como resultado, disminuye el volumen de producción de maquinaria plástica. Este fenómeno aumenta el tiempo de residencia del material en el barril, provocando que el material se descomponga. Si es cloruro de polivinilo, el gas cloruro de hidrógeno generado por la descomposición refuerza la corrosión del tornillo y el barril.

4. Si hay rellenos como carbonato de calcio y fibra de vidrio en el material, puede acelerar el desgaste del tornillo y el barril.

5. Debido a que el material no se plastiza de manera uniforme o hay objetos extraños metálicos mezclados con el material, la fuerza de torsión de rotación del tornillo aumenta repentinamente. Este par excede el límite de fuerza del tornillo y hace que el tornillo se retuerza. Este es un daño por accidente no convencional.


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