The study presents the results of investigations on the hardening kinetics of modern pattern materials which, among others, include also epoxy resins. Tests were carried out using a new ultrasonic technique developed by the author of the present study. On the example of the EPO 999 resin, the run of the hardening process at temperatures of 10, 20 and 30°C was shown. This is the temperature range applied during production of foundry patterns. The time of the preliminary hardening amounted to 800 min at a temperature of 10°C , and to only 180 min at a temperature of 30°C . Using ultrasonic technique, the effect of temperature on the modulus of elasticity Ed of the examined resin was determined. The temperature has been observed to exert a linear effect on the value of the modulus Ed. When the resin pattern is preheated in the range of temperatures from 20 to 50°C , the value of the modulus Ed decreases by 30%. The drop in the value of the modulus Ed, as well as the resin hardness decreasing from 18 to 9,0 HB at the increasing temperature reduce the applicability of this material for patterns operating at high temperatures (moulding sands).
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Wysokie wymogi jakościowe współczesnego odlewnictwa, zmuszają do coraz większego wsparcia wytwarzania modeli odlewniczych nowoczesną techniką ich projektowania oraz wykonawstwa. Dotyczy to także metod odlewania precyzyjnego a w tym technologii wytapianych modeli. Artykuł prezentuje nową metodę komputerowego wspomagania tych procesów przy użyciu techniki szybkiego prototypowania (Rapid Prototyping) z wykorzystaniem techniki nakrapiania wtryskowego – DODJET.
EN
The requirements of modern foundry with its’ widening range of offered products require the more complex supporting role of modern technique of designing and producing both patterns and foundry moulds. It also concerns the methods of investment founding including the technology of smelted patterns. This article presents the original method of computer aiding these processes by using the Rapid Prototyping method.
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