注射温度和压力对蜡模流动性的影响

IF 3.3 Q2 ENGINEERING, MANUFACTURING
V. Bazhenov, Andrey Sannikov, E. P. Kovyshkina, A. Koltygin, A. Bazlov, V. Belov, Dmitry N. Dmitriev
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引用次数: 0

摘要

在熔模铸造工艺中,由蜡制成的图案在模具中得到,用于进一步形成壳型。模蜡充模问题是影响铸件质量的重要问题。本文采用一种新开发的注入流动性试验方法对三种工业蜡的流动性进行了研究。结果表明,蜡的流动性随注射温度和压力的升高而增大,同时升高温度和压力比单独升高温度和压力对蜡的流动性的增强要显著得多。用旋转粘度计研究了蜡在不同温度下的流变行为,并确定了蜡的动态粘度与温度的关系。结果表明,在90 ~ 60℃范围内,随着温度的降低,蜡的粘度增加了10倍以上。观察到蜡的流动性和粘度之间有很好的相关性,这与金属合金不同,金属合金的凝固行为更为关键。与金属熔体相比,蜡流动行为的差异与动态粘度的差异有关,所研究的蜡和金属熔体的动态粘度分别为3000-27,000 mPa·s和0.5-6.5 mPa·s。观察到所研究的填充蜡的流动性差异,这可能与填料的类型和数量有关。交联聚苯乙烯的分数增加一倍,流动性降低两倍。同时,对苯二甲酸对蜡的流动性影响较小。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The Influence of Injection Temperature and Pressure on Pattern Wax Fluidity
In the investment casting process, the pattern made of wax is obtained in a die for further formation of a shell mold. The problem of die-filling by pattern wax is significant because it influences the quality of the final casting. This work investigates three commercial pattern waxes’ fluidity with a newly developed injection fluidity test. It was shown that the fluidity of waxes increased with increasing injection temperature and pressure, and the simultaneous increase in temperature and pressure gives a much more significant enhancement of fluidity than an increase in temperature or pressure separately. The rheological behavior of the waxes was also investigated at different temperatures using a rotational viscosimeter, and temperature dependences of waxes’ dynamic viscosity were determined. It was shown that wax viscosity is increased more than ten times with decreasing temperature from 90 to 60 °C. A good correlation between wax fluidity and its viscosity is observed, which is different from metallic alloys, where the solidification behavior is more critical. The difference in wax flow behavior in comparison with metallic melts is associated with the difference in dynamic viscosity, which for investigated waxes and metallic melts is 3000–27,000 mPa·s and 0.5–6.5 mPa·s, respectively. The difference in investigated filled waxes’ fluidity is observed, which can be associated with the type and amount of filler. The twice-increasing fraction of cross-linked polystyrene decreases fluidity twice. At the same time, terephthalic acid has a minor influence on wax fluidity.
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来源期刊
Journal of Manufacturing and Materials Processing
Journal of Manufacturing and Materials Processing Engineering-Industrial and Manufacturing Engineering
CiteScore
5.10
自引率
6.20%
发文量
129
审稿时长
11 weeks
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