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Injection molding press selection

2015-4-6 02:02| 发布者: adminer| 查看: 400| 评论: 0

摘要: Injection molding press selectionThe following parameters should be reviewed when selecting or comparing presses: Dry cycle time-indictor of clamp speed. Injection rate capability –speed. Screw recov ...
Injection molding press selection


The following parameters should be reviewed when selecting or comparing presses:

    Dry cycle time-indictor of clamp speed.
    Injection rate capability –speed.
    Screw recovery rate (calculate needed rate).
    Clamp tonnage and type.
    Tie bar diameter, tie bar clearances for mold.
    Platen size, thickness, support to ways, etc.
    Screw and barrel L/D, bi-metallic, tip type.
    Oil capacity: multi-pumps or accumulators –can different machine functions occur at same time , such as clamp open and ejection or core pull.
    Injection speed profile capabilities.
    Method of transfer from fill to hold psi.
    Min/max daylight( opening)of clamp.
    Max resin pressure vs hyd pressure req’d
    SPI KO patterns present.
    If toggle –location of force to platen.
    Temperature control- # of zones, PID type ?
    Multi –ejection; dwell forward; intermediate stop/ dwell capability: useful for part runner separation if mold is so designed.
    Platen cooling- useful if warm/hot molds are run; platen thermal expansion re-sults in tie bar movement which requires more mold closing and mold protection pressures (also wear issue).

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