Simulation and analysis of temperature field in closed gating system of axle housing
The simulation of temperature field is shown in Fig. (a). When t = 8.4s, the solidification fraction of axle housing is 16%, and the bottom of axle housing is in figure (b), when t = 16.7s, the temperature drop further diffuses to the whole axle housing. At this time, the solidification fraction of the axle housing is 26%. In figure (c), when t = 96.7s, most of the axle housing has solidified, and the solidification fraction of the axle housing is 74.4%. At this time, the isolated liquid region appears in the axle housing When t = 117.7 s, figure (d) shows that the solidification fraction of the axle housing is 86.6%, and the isolated liquid phase region is scattered in the axle housing.
Simulation and analysis of temperature field in open gating system
The simulation of temperature field is shown in the figure. When the liquid metal enters the gating system, when t = 11.7s, as shown in Fig. (a), the solid fraction of the axle housing is 30%, and the peripheral sharp edge of the axle housing first reduces the temperature, and different temperature distribution regions appear; when t = 31.3s, the temperature field decreases As shown in figure (b), the temperature drop further diffuses to the whole axle housing, and the flange end surface first solidifies, and the solidification fraction of the axle housing is 50.7%; when t = 71.3s, as shown in figure (c), the axle housing has solidified, and the solidification fraction of the axle housing is 78.9%, and the isolated liquid phase zone begins to appear in the axle housing; when t = 121.3s, as shown in Fig. (d), the solidification fraction of the axle housing is 50.7% There are scattered and isolated liquid phase regions in the axle housing, which will result in the volume deficit in the final solidification stage, which can not achieve simultaneous cooling and produce shrinkage cavity.
Simulation and analysis of temperature field in semi closed gating system
The temperature field simulation of semi closed gating system is shown in the figure. After the start of liquid metal pouring, when t = 12.6s, as shown in figure (a), the solid phase fraction of the axle housing is 24%, and the temperature at the bottom flange end and peripheral edge of the axle housing first decreases; when t = 82S, as shown in figure (b), the temperature decrease further diffuses to the whole axle housing, and the solidification fraction of the axle housing is 69.9%; at t = 102s, the solidification fraction of the axle housing is 69.9% As shown in figure (c), most of the axle housing has solidified, and the solidification fraction of the axle housing is 77.3%. At this time, the large isolated liquid phase region begins to appear in the axle housing; when t = 122 s, as shown in figure (d), the solidification fraction of the axle housing is 82.7%, and the scattered isolated liquid phase region further decreases and shrinks.
