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Specific requirements for precision injection molding
Firstly, the injection pressure should be greater than 25MPa; Injection speed greater than or equal to 300mm/s; The dimensional accuracy of the product is 0.001mm; The coefficient of standard deviation (rate of change) of product quality is less than 0.1%; Precision of opening and closing positions: opening ≤ 0.03mm, closing ≤ 0.01; The injection position accuracy (pressure maintaining end point) is less than 0.03mm; The force balance of the pull rod is less than 1%; The precision of the pre molded position is less than 0.03mm; Balance degree A of fixed and dynamic templates: less than 0.03mm when the locking force is zero; B: less than 0.005mm when the locking force is greater than z; The temperature control accuracy of the barrel and screw is less than ± 0.5 ℃.
Technical Focus of Precision Injection Molding
Locking force: In the process of precision injection molding, high injection pressure is generally required, otherwise it is difficult to form.
Measurement accuracy: To maintain high stability of plastic products, the amount of hot melt plastic injected into the mold cavity must be equal each time.
Injection speed: Injection speed is an important indicator of precision injection molding machines.
Injection pressure: Precision injection molding requires a larger injection pressure to improve the compactness of the plastic part, reduce shrinkage deformation, and ensure the accuracy of the product.
Pressure maintaining: Pressure maintaining has a significant impact on precision plastic parts.
Mold temperature: The temperature change on the surface of the mold cavity should be controlled within ± 1 ℃.
