23 November 2009
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23 November 2009
Advanced Composites Group Ltd has launched CB1100, a high-grade ceramic tooling block material, which the company says offers a combination of high temperature resistance and exceptionally low coefficient of thermal expansion (CTE).
CB1100 is said to be fully compatible with ACG’s LTM epoxy and HTM Bismaleimide (BMI) prepregs and can produce thermally stable composite tooling capable of withstanding the high pressures and elevated temperatures associated with autoclave cure cycles.
ACG’s say that the CB1100 ceramic tooling block can be used as a high temperature capable master model. They claim machining times for CB1100 are short and, because of its very low thermal expansion, CB1100 is also particularly suited to the production of high accuracy, short run and prototype tooling, where it can save time and cost.
BMI tooling produced with a CB1100 core can be produced direct from the block without the need for a high temperature capable intermediate. CB1100 blocks can be fabricated and machined to form a tool core, totally eliminating the need for a master model.
The composite tool skin, laminated directly to the core, uses ACG’s patent pending interfacing technology. Due to the high thermal stability of the ceramic core, ACG say that the tool skin can be cured in a single operation without the need for an initial low temperature cure and then followed by a subsequent free-standing, high temperature post-cure.
The carbon tool skin is fully supported by the ceramic core so there is no need for a backing structure. The tool face is CNC-machined to create the final surface profile, thus overcoming accuracy issues created by intrinsic laminate shrinkage, resulting in an exceptionally accurate and stable tool.
CB1100 does not absorb water so it does not require drying or subsequent venting of the tool, and it is incombustible.