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  • Home > SMC Mould Blog > Company News

    SMC Mould Blog

    compression molding tooling of smc,bmc and gmt


    Tool materials

    Deponding on the application and expected service life production volumes,materials like aluminium and steel(unquenched and untempered) are used.These materials  will be used predominantly for prototype tools,but for serial tools quenched and tempered steel sorts like 1.2311 or 1.2738(German steel) are normally used,tool for class A products wigh high volumes may even require 1.2738HH steel.


    Temperature system

    The working temperature of the tools is usually 140℃ to 160℃.When designing the temperature system,it is essential to be able to maintain surface temperature within very close parameters.A symmetrical layout of the temperature system’s circuits have been proven.Normal heating systems are stem,oil,high oressure water or electricity.


    Wear protection

    High volume production requires protection of  a tool’s surfaces against  abrasion.Processes like hard chrome-plating or laser hardening will be used,and chrome plated surface are recommended;especially for LP-SMC.


    Part ejection

    SMC/BMC  materials have minimal process shrinkage.This behaviour  require very colse attention in the design stage with regard to deformaton-so called draft angles.Generally speaking:the bigger the better.

    On the tooling side,air vents and an optomized layout of ejectors are necessary to remove parts from the tool well.But outer shell parts with class A requirements must not have ejectors.


    Vacuum system

    Class A parts are produced with vacuum assist compression moulding.Insulation of the tool’s inner cavities against vacuum leakage is also essential.


    If you have any new compression mold project need make,email to alice@ningguangmould.com


    ALICE CHEN

    EMAIL:alice@ningguangmould.com

    MOBILE PHONE:+8613989617789

    FAX:86-576-84616787

    Wechat: 13989617789

    Website:www.smctooling.com






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