基于SLA的快速精密铸造型壳制备工艺的研究

Preparation of Shell Mold for Rapid-precision Casting Based on the SLA

研究了入炉温度对快速成型用光固化树脂热膨胀特性的影响,研究表明,入炉温度不同,光固化树脂的热膨胀趋势基本相同,但膨胀率不同;入炉温度越高,热膨胀曲线斜率越大,其膨胀速率越大;随着入炉温度的升高,树脂原型的最大膨胀率增大。据此,确定了快速精密铸造用型壳的焙烧工艺为80～100℃入炉焙烧,以150℃/h速率升温到950℃保温30min,随炉冷却至室温出炉。

Influence of temperature on thermal expansion ability of photocurable resin specimens used in rapid prototyping(RP)has been approached.The experimental results indicate that with different temperatures,while the thermal expansion trend is the same,the thermal expansion rate is different.With increasing in the temperature,the thermal expansion curves and thermal expansion rate as well as the maximum expansion rate of the resin prototyping are increased.Based on above results,the baking processing for mold shell for the rapid-precision casting is as follows:photocurable resin prototypes come into furnace for baking at 80～100 ℃,then the temperature of the furnace is increased to 950 ℃ by 150 ℃/h for 30 min and then cool off.