Initial and boundary conditions of aluminum alloy die casting
In order to obtain the unique solution of hydrodynamics, not only the above basic equations, but also the boundary conditions […]
In order to obtain the unique solution of hydrodynamics, not only the above basic equations, but also the boundary conditions […]
Die casting, referred to as die casting, is a kind of precision casting method in which liquid or semi liquid
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,
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
With the development of semi-solid theory and the promotion of semi-solid forming technology, more and more kinds of semi-solid die-casting
Aluminum is the most abundant metal element in the earth’s crust. Although the large-scale preparation and industrial application of aluminum
Aluminum alloy has a series of excellent properties and high efficiency of energy conservation and environmental protection effect. It is
Vacuum die casting is an advanced die casting technology, which can eliminate or reduce the defects such as air entrainment
7 Discoloration and spots (1) characteristics: There are different colors and spots on the casting surface. (2) Causes: ① Improper
Casting can also be divided into gravity casting and pressure casting according to the pouring process of liquid metal. Gravity
4.Casting deformation (1) characteristics: ① Overall deformation or local deformation; ② the geometric drawing of the die casting is inconsistent.
1 casting strain (1) characteristics: ① Along the opening direction, the surface of the casting shows a line like scratch
Thinking of solving die casting defects Because the causes of each defect come from many different influencing factors, so in
Die casting is a kind of metal mould pressure casting on die casting machine, which is the most efficient casting
6 Non metallic hard point (1) Features and inspection methods: In the process of machining or after machining, the appearance