Prediction and improvement of the lifetime of polymer pressure casting moulds
article
The lifetime of porous polymer moulds used for pressure casting of sanitaryware has been analysed, modelled and improved. The mechanical behaviour of the existing porous PMMA mould material was analysed using mechanical tests to assess the lifetime under cyclic loading. The relevant stress levels were obtained through in-situ strain gauge measurements on a polymer mould for the production of a wash basin. These results were confirmed by means of Finite Element stress analyses. The lifetime of the wash basin mould under the relevant production conditions was predicted from these data and found to be in good agreement with practical experience. A method to improve the limited lifetime under higher pressures was developed by applying nanodispersed clay as reinforcement. The improved material shows an increase in lifetime under cycling loading by about 1000% in mechanical tests. This improvement is confirmed for a pressure casting mould made of the improved material when used in the actual production process.
Topics
TNO Identifier
236403
ISSN
01739913
Source
CFI Ceramic Forum International, 79(1-2)
Collation
5 p.
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