Influence of mold filling speed on defects of squeeze casting parts

In order to improve the quality of wheel shaped squeeze casting parts, the process parameters of different extrusion filling speeds were set to simulate, the results were compared and the probability of defects was analyzed. The specific process parameters are pouring forming temperature 620 ℃, mold temperature 160 ℃, filling speed from 0.05, 0.1, 0.2, 0.3, 0.4, 0.5m/s and other six speed modes to simulate, the probability of defect parameter distribution is shown in Figure 1.

From the above probability defect simulation results, when the mold filling speed of squeeze casting is 0.3, 0.4, 0.5m/s, the defect situation is very close, because after the speed reaches a certain height, the filling situation is basically the same, resulting in the same defect distribution. When the extrusion filling speed is 0.1 and 0.2m/s, the probability defect distribution is the least, but there is no significant difference between them. When the filling velocity is 0.05m/s, the probability defect distribution is more. Therefore, when the filling speed is 0.05, 0.1, 0.2 and 0.4m/s, the filling process is simulated, and the filling to the middle position and the filling flat position are compared and analyzed. See Figure 2 for details.

It can be seen from the comparison in the figure that when the speed is 0.05m/s, the filling speed is slow, and the melt speed is basically the same, but the solidification speed is too fast, and the probability defect distribution is the most; when the speed is 0.1m/s, the central speed is slow, and the speed at the narrowed ring channel is faster, and the uniformity of the speed flowing to the bottom of the outer wall is slightly poor, which will lead to some defects; when the speed is 0.2m/s, the probability defect distribution is the most When the velocity reaches 0.4m/s, the alloy melt flows to the top of the cavity at the beginning, sealing the inner corner of the top, and there are a lot of entrapment phenomenon and more probability defects. Therefore, from the above comparison, the filling speed of 0.2m/s is appropriate.

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