精密射出成形金型の定義本当に知っていますか？
The definition of precision injection molds is determined according to two indicators, one is the precision of the processing equipment, and the other is the error caused by the mold processing. The comprehensive level of an injection molding machine is determined by the weight error of the injection molding machine. The error is less than 0.5% for the precision injection molding machine, the error is less than 0.3% for the ultra-precision machine, and the machine with the error of about 1% is the ordinary injection molding machine. As of the current state of the art, the world’s most precise injection molding machine can achieve an error of less than 0.15%.
The accuracy of the processed mold is mainly affected by several factors:
AS樹脂は、強力な耐荷重性、耐薬品性、耐熱変形性、幾何学的安定性を備えています。 AS樹脂にガラス繊維添加剤を添加すると、強度と熱変形に対する耐性が高まり、熱膨張係数が低下します。 AS樹脂のVicat軟化温度は約110°Cです。 荷重たわみ温度は約100°Cです。 AS樹脂の収縮率は約0.3〜0.7％です。 AS樹脂は硬くて透明な素材です。 スチレン成分により、AS樹脂は硬く、透明になり、加工が容易になります。 アクリロニトリル成分は、SAN（AS）を化学的および熱的に安定させます。
The processing temperature of the AS resin is generally from 200 to 250 ° C. The material is easy to absorb moisture and needs to be dried for more than one hour before processing. Its fluidity is slightly worse than PS, so the injection pressure is slightly higher. Drying treatment If the storage is not suitable, the AS resin has some hygroscopic properties. The recommended drying conditions are 80 ° C for 2-4 hours.
The melting temperature is 200-270 °C. If a thick walled product is processed, a melting temperature below the lower limit can be used.
Injection pressure 350-1300 bar Injection speed High-speed injection is recommended
Runners and Gates All conventional gates can be used. The gate size must be appropriate to avoid streaks, freckles and voids.
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