| Autor: |
Prashanth Yadav, A., Reddy, G. S., Hafeez, Md. |
| Předmět: |
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| Zdroj: |
AIP Conference Proceedings; 2020, Vol. 2358 Issue 1, p1-9, 9p |
| Abstrakt: |
Boom post is a part of the excavator equipment made from a sand mold or investment molds. Because of its complex shape and difficulty of precise management of heat and fluid flow, a considerable percentage of castings rejected due to shrinkage porosity defect. This research aims to design investment cast mold such that heat flow controlled using thermal insulation wraps on mold surfaces required to promote directional solidification beginning from the farthest region of the mold towards the riser. A geometric model for the boom developed from the exact measurements made at the manufacturing site. CATIA CAD package used for geometric modeling. Three simulation experiments were conducted with and without the thermal insulation wrapping. Simulations run without wrapping revealed the casting regions where shrinkage porosity and hot spots occur. Based on solidification principles, riser(s) designed by maintaining the surface area to volume ratios to promote directional solidification. In addition, the insulation wrappings controlled heat flow to direct the shrinkage formation in riser(s). Thermal insulation 'K-wool' employed on mold surfaces has delayed cooling of molten steel resulting in shifting shrinkage porosity to risers. Cooling curves at the hot-spot prone sites revealed useful information that helped controlling shrinkage porosity in the complex-shaped casting. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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