Effect of process parameters on solid-liquid segregation in semi-solid die casting with thick wall
Solid liquid segregation is one of the main defects in thick wall products. Under the condition of good feeding condition […]
Solid liquid segregation is one of the main defects in thick wall products. Under the condition of good feeding condition […]
The influence of process parameters on the shrinkage cavity and porosity in the semi-solid die casting process was studied by
In the process of analyzing the solid-liquid segregation, in order to identify the bright white cxal grains and the dark
Semi solid die casting is different from the traditional liquid die casting, which is mainly reflected in the different slurry
In this experiment, the method of controlling variables is adopted. The mold temperature is set as 230 ° C, 140
Shrinkage porosity defect is the key research object of this project. The observation method for this defect is fluorescence penetration
In this test, the control variable method is adopted, and the material handle thickness is set as 16mm, 31mm, 42mm
Vickers hardness measurement The unit of hardness measured is micro Vickers hardness. When hv-30 Vickers hardness tester is used, the
During the preparation of metallographic samples, sawing, cutting, grinding, polishing and other processes are required. After the blank samples to
In this test, the method of variable control was adopted. Under the condition of other parameters unchanged, the boosting pressure
(1) Aiming at the common shrinkage and porosity defects in semi-solid die-casting thick wall products, the microstructure analysis and mechanical
Solid liquid segregation is a typical semi-solid defect in thick wall products. It refers to the uneven distribution of solid
In semi-solid casting, in order to reduce or even eliminate the shrinkage cavity and porosity defect, the surplus slurry is
1 metallographic structure analysis The optical microscope (OM) used in this experiment is axiovert 200, and the magnification is 25,
The traditional liquid die casting metal from liquid solidification to solid state needs first liquid shrinkage in pure liquid state,
In the defect analysis of semi-solid thick wall products, shrinkage cavity and porosity are the typical defects studied. In the
Due to the characteristics of semi-solid slurry, semi-solid forming has the following natural advantages over other casting methods (1) In
The preparation of semi-solid slurry is the most important part of semi-solid forming technology. With the continuous development in recent
Taking a brake caliper casting of MQB platform of Volkswagen as the research object, a series of research on the
With the development of semi-solid theory and the promotion of semi-solid forming technology, more and more kinds of semi-solid die-casting
In 1971, Professor Flemings’ student DB When Spencer studied the hot cracking problem of alloy at high temperature, due to
According to the above theory, in order to meet the requirements of the sectional area of the sprue, it is
Aluminum is the most abundant metal element in the earth’s crust. Although the large-scale preparation and industrial application of aluminum
(1) The 3D scanning equipment is used to scan the casting surface one by one, and then the three-dimensional surface
The proportion of raw materials for smelting is scrap: recycled material = 4:6, and the composition of molten iron after
The simulation results of filling temperature field are shown in Figure 1. It can be seen that the filling liquid
(1) Confirmation of number of cavities and type of gating system The equipment model is disa230x, and the mold plate
The gating system is composed of a gate cup, a runner, a sprue and an inner gate. It is a
Inoculation treatment: inoculation treatment of nodular cast iron can improve the roundness of graphite ball, improve the spheroidization rate, and
The causes of shrinkage cavity and porosity of nodular cast iron are complex. The main factors affecting primary shrinkage, volume