MICRO MOULDING | ARTICLE


Regarding the steels, remember — particularly in the case of high- performance materials at extremely high temperatures — that expansion may seriously affect the final tolerances obtained in the micro piece.


When designing and constructing the mould or when envisioning the production process, one point that tends to be forgotten is that of the ejection of the piece. In many cases, the piece is so small that no traditional ejector can be inserted in the cavity. Here, one must play on the divisions of the mould, naturally adhering parts of the piece, auxiliary extraction systems, etc. As regards machining the cavity in the micro mould, there are limitations which make it necessary to employ new techniques such as micro EDM, UV-LIGA, laser ablation or micro machining using a micro tool. In economic terms, once again the small size runs counter to the cost and the speed of machining must not be compared with the traditional moulds.


A key point when selecting the machining technology for this type of mould is the balance between accuracy and surface quality. Certain techniques allow very great accuracy but have insufficient surface qualities, and vice versa with others. The matter of surface quality cannot just be a requisite of the final piece but has to play a key role in the rheology of the filling of the micro cavity or in the ejection of the piece. In certain cases, it may hinder or ease the control process which is produced optically in most cases.


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EX CEEDING THE LIMITS OF MICRO-MOLDING 15 | commercial micro manufacturing international Vol 7 No.1


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