The screenshot of the flow velocity results during the filling process can be seen from the above. It can be seen that the molten iron in the runner is almost simultaneously entered into each runner, and the molten iron is average Assigned to each casting. It can be seen that the four castings are almost full at the same time. This shows that changing the cross-sectional area of the cross-runner can obviously improve the iron content of each casting in the series pouring system. For the result of the improved process during the filling process, it can be seen that the result of the filling process has been significantly improved. The filling flow rate of the molten metal that will fill the entire cavity (Scheme 2) 2 Comparison of the results of Plan 1 and Plan 2 2.1 Comparison of the flow rate during the filling process Compare the flow rates of the runners in Plan 1 and Plan 2 (and), you can It can be seen that the average flow velocity of molten iron into the inner sprue in scheme 1 is 280 cm / s, and the average velocity of molten iron into the inner sprue in scheme 2 is 220 cm / s, that is to say, the cross-flow pouring away from the direct sprue is sequentially reduced
The cross-sectional area of the channel has a great effect on reducing the flow velocity of molten iron into the inner sprue. 2.2 Comparison of hot metal flow distribution during filling process Comparison of the hot metal flow distribution in plan 1 and plan 2 (,, and), it can be seen that: in plan 1, at the beginning of filling, almost all hot metal has entered In the casting cavity farthest from the sprue, the molten iron gradually enters the casting cavity close to the sprue. In the middle stage of filling, molten iron enters in each casting cavity, but in the initial stage, the casting cavity far away from the gas-filling result (scheme 2) in the casting process is filled first. Hot metal, so in the middle stage, the liquid level of the molten metal in each casting is always stepped, and the liquid level of the casting farthest from the sprue is the highest, and the liquid level closest to the sprue is the lowest. In the later stage of filling, the casting cavity farthest from Copper pipe fittings TP2 company the sprue has been filled with molten iron, and the molten iron is distributed into the casting cavity that has not yet been filled. Option 2: Hot metal is evenly distributed into each casting cavity from the time it enters the cavity, and until the end of filling, the hot metal is almost evenly distributed into each casting cavity, that is, in the entire process of filling
The molten iron level in each casting cavity cast in series is almost the same. It can be seen from this result that sequentially reducing the cross-sectional area of the cross-runner away from the sprue can make the molten iron flow of each casting in the series pouring system evenly distributed. 2.3 Comparison of the results of the gas filling during the filling process Comparison of the results of the gas blowing between scheme 1 and scheme 2 (and), it can be seen that the gas phenomenon in scheme 1 is much more serious than that in scheme 2 (Figure The colored areas in it indicate the tendency to gas). Most of the cavities in Scheme 1 have a tendency to engender gas, while in Scheme 2 only a part of the upper part of the cavity has a tendency to engulf. 3 Conclusion The use of series casting can significantly improve the production efficiency of small castings. For the design of the series pouring system, designing the cross-runner as a variable cross-runner can significantly improve the distribution ratio of molten iron in each casting cavity, thereby reducing the flow rate of molten iron, and improving the phenomena of air entrainment, sand flushing, and slag inclusion. It improves the quality of castings, and also provides an effective new calculation method for the design of series pouring system in the future.
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