三乙胺法冷芯盒制芯工艺影响因素的研究.pdf

华中科技大学硕士学位论文
Abstract
Tri-ethylamine Cold Box Core-making Process, with the features of more efficiency,
energy saving, good casting surface quality, accurate dimension, good core collapsibility
has been widely used in automobiles, internal combustion engines, tractor, engineering
machinery, rolling stock, brake pump. However, the high usage amount of resin, low
performance and bad storage of sand core lead to the high scrap rate in production process
of some Foundry Enterprise. Therefore, further studies on these problems can provide
chnical support for optimization of Tri-ethylamine Cold Box Core-making Proces
enhancing sand core performance and reducing production cost, which have important
realistic significance
In this paper, combining the production practice of No.1 Foundry Plant, Dongfeng
motor Co, Ltd (hereinafter called: NoI Foundry Plant), reasons for the high usage
amount of resin and low efficiency of core-making were analyzed. Furthermore, effects of
process conditions for sand core performance of Tri-ethylamine Cold Box based on actual
production were studied Finally, several improvement measures of ISOCURE of No
Foundry Plant were proposed, and the results achieved are as follows
Through analyzing quality of raw materials and production process of Tri-ethylamine
Cold Box Core-making of No.1 Foundry Plant, high water content of the raw sand and the
compressed air is identified as the main reason for high usage amount of resin
The effect of the amount of added resin on sand core performance was studied. The
sults showed that the initial strength and the 24h final strength of sand core increased
with the increase of amount of addition of resin, the gas evolution indicate the same
variation tendency. When the amount of added resin is 1.8%, he 24h final strength reach
the maximum at the ratio of two components is 50: 50, and the initial strength reaches its
maximum at the ratio of 55: 45. It is also can be seen that the tensile strength of sand core
has good stability when the ratio is between 50: 50 and 55: 45
And then, research of water-based paint, environmental humidity and temperature on
strength and fracture of sand core were also explored. The results showed that the
water-based paint made the 24h final strength decrease significantly, but the decline rate