The long-term practice of domestic and foreign researchers has proved that the liquid die forging process has many advantages that the forming process does not have, such as high mechanical properties, generally without shrinkage porosity and shrinkage cavity, the material structure is dense and uniform, the grain size is fine, and the mechanical properties are almost close to the level of die forging; the material utilization rate is close to 90%, and there is no casting riser, and the surface finish and dimensional accuracy of the material are high It can be used in nonferrous alloys, ferrous metals such as iron and steel, and even composite materials. It can be used for castings with large wall thickness and complex structure. It can save energy. The qualified rate of products is high, and the energy consumption is high. Green degree is high. There is no emission of dust, harmful gas and harmful solid It is an advanced manufacturing technology with no pollution or less pollution, low energy consumption and high quality, which can speed up the pace of green production.
In the production process of liquid die forging, due to the different shape and size of castings, the solidification time, speed and process of liquid metal in the mold cavity will be different. In order to obtain castings with good performance, the process parameters set by different castings will be different. It is of positive significance to study the process parameters of liquid forging for the production of qualified products.
In the liquid forging process, several common process parameters are as follows:
(1) Melting quality of molten metal;
(2) Pouring temperature of molten metal;
(3) Filling pressure;
(4) Holding time;
(5) The starting time of pressurization;
(6) Preheating temperature of mould;
(7) Pressurization speed