Abstract
The paper deals with squeeze casting technology. The influence of process parameters variation (casting temperature, mold temperature, pressure) will be observed. The experimentally obtained boundary conditions (heat flow, HTC) will be verified using the ProCast simulation software. Shape influence on the mold filling process and the temperature field under pressure will be evaluated. To evaluate the mechanical properties, a tensile test was performed. Three identical samples were cast for each parameters change. From these samples the average values of the mechanical properties were measured and calculated. The thickness of the flat test samples was 3.15, 4, 5, 6.3, 8 mm with a sample width of 10 mm. For gravity cast of the casting, the mechanical properties of the thinner parts were higher. At the pressure influenced castings, the mechanical properties were higher in the thicker parts of the casting.
Highlights
The squeeze casting technology, which was used in experimental verification of the heat transfer is a relatively unusual method
The main characteristics of this method, which are distinguishing it from conventional high-pressure casting include, in particular, the slow filling of the melt into the mold cavity and considerably larger gates, than those used in the high-pressure casting
The pressure itself prevents the formation of an air gap, which is normally formed at the gravity casting between the casting and the mold
Summary
The squeeze casting technology, which was used in experimental verification of the heat transfer is a relatively unusual method This is due, in particular, to little experience with practical use combined with the low lifetime of the mold, which is caused by high thermal and mechanical stresses combined with a long cycle time. The pressure itself prevents the formation of an air gap, which is normally formed at the gravity casting between the casting and the mold This air gap substantially slows heat transfer and the cooling rate of the casting. Pressure utilization at the squeeze casting technology greatly accelerates solidification and cooling in the thicker areas of the casting This is associated with the eliminate of an air gap formed by gravity casting. The result is a change in structure and a significant increase in mechanical properties compared to gravity casting [1, 4, 5, 6, 7, 10]
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