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

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