A variable flow electromagnetic low pressure mold filling method for aluminum alloy melt

Abstract

An electromagnetic low-pressure mold filling method with variable flow rate of aluminum alloy melt is applied in the field of advanced manufacturing technology. The specific process is: three-dimensional modeling of castings and process drawings; generation of three-dimensional STL data files; Calculate the casting height (h), cross-sectional area (s) and perimeter (1) corresponding to the layer and the equivalent diameter (d) corresponding to each height, and use the equivalent diameter value at each place to calculate the average iso-flow pipe The diameter of the complex cross-section mutation casting is converted into a simple casting of the iso-flow tube type; the regular curve of the critical inlet velocity value of the ingate corresponding to the ratio of the cavity area to the ingate area obtained by the numerical simulation of the flat casting , to obtain the velocity value at the entrance of the casting; then use the actual liquid Bernoulli equation of fluid mechanics to calculate the pressure at different interfaces, so as to determine the P-t curve of the variable flow filling process of the casting; according to the variable flow P-t curve, use electromagnetic force to control the metal Hydraulic low pressure filling. The beneficial effect of the invention is that it can realize stable filling of the aluminum alloy melt, and the phenomena of splashing and air entrainment are not easy to occur during the filling process, thereby ensuring the quality of the casting.

Description

technical field [0001] The invention is applied in the field of metal casting, and in particular relates to an electromagnetic low-pressure mold filling method with variable flow rate of aluminum alloy melt. Background technique [0002] In the field of casting, for castings with complex shapes, the cavity structure is also complex and changeable, and the cross-sectional areas of castings corresponding to different heights are not the same. In the current low-pressure filling method, the process curve is a line segment with a constant slope (see the figure below), that is, after the pressure required for the casting filling process is calculated using the traditional formula, ΔP is increased by a fixed value. In this process, this process method ignores the shape characteristics of the part. If the part is a relatively complex thin-walled casting, but it still fills the mold at a constant filling rate when the cross-section of the casting changes greatly, then in During the...

AI Technical Summary

Problems solved by technology

In the current low-pressure filling method, the process curve is a line segment with a constant slope (see the figure below), that is, after the pressure required for the filling process of the casting is calculated using the traditional formula, ΔP is increased by a fixed value. In this process, this process method ignores the shape characteristics of the part. If the part is a relatively complex thin-walled casting, but it still fills the mold at a constant filling rate when the cross-section of the casting changes greatly, then in During the filling process, it is easy to generate splashing and air entrainment, which reduces the quality of castings

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