论文部分内容阅读
研究了在真空状态下,呋喃系树脂砂芯吹入浓度为1～5％SO_2气体后,真空硬化规律特点及某些特性,研究真空硬化工艺性能,即改变真空硬化工艺因素、吹SO_2气体硬化时间、SO_2保留时问及抽真空保持时间等对砂芯性能(初始,24h抗压强度)的影响。分析研究真空硬化后的呋喃树脂砂芯材料发气性变化规律、红外烘干后对抗压强度的影响及其微观结构特点。
The vacuum hardening characteristics and some properties of fumed resin sand core after blowing fumed resin sand core with concentration of 1 ~ 5% SO2 were studied. The properties of vacuum hardening process were studied, ie, the factors of vacuum hardening process were changed, and the blowing of SO_2 gas was hardened Time, SO_2 retention asked about the vacuum holding time on the sand core performance (initial, 24h compressive strength) impact. The variation regularity of gas evolution of furan resin sand core material after vacuum-curing, the influence of compressing strength after infrared drying and the microstructure characteristics were analyzed.