Calculation of shrinkage and prediction of shrinkage casting defects
To calculate the shrinkage of an isolated hot spot, first determine the isolated region, and then use the formula to […]
To calculate the shrinkage of an isolated hot spot, first determine the isolated region, and then use the formula to […]
Pouring temperature refers to the temperature when the molten metal enters the gate. If the pouring temperature is too high,
In the solidification process of sand casting, due to the solidification shrinkage of sand casting itself and the expansion of
1. Sand core mold design As shown in Figure 1, the center of the spiral case of sand core I
In the process of sand casting, liquid metal is poured into the mold and then dissipated heat to the surrounding
A series of physical and chemical changes will occur in the filling process of sand castings, such as heat transfer,
Aiming at the research and application of preparation technology of high-performance nodular cast iron crankshaft, an exploratory study was made
(1) In laboratory experiments, applying ultrasound during solidification can refine the microstructure of nodular cast iron, increase the roundness of
Sand casting belongs to metal liquid forming technology. In actual production, sand casting engineers often formulate processes according to previous
Niyama criterion is selected as the prediction method of shrinkage porosity of spiral bevel gear casting. As shown in figures
The figure shows the numerical simulation diagram of filling and solidification process of gear blank casting with common gating scheme
Different sand casting methods have different requirements for the mold. The sand casting mold of turbine cover casting is mainly
The figure is the schematic diagram of shrinkage defects and air pressure distribution at different positions after complete solidification of
The figure shows the numerical simulation diagram of mold filling and solidification process of sand casting with central top injection
In CATIA three-dimensional modeling software, save the component digital models of sand casting and gating system as STL format and
The common Pouring Scheme of pouring riser refers to the selection of three cylindrical thermal insulation open risers, which are
Generally speaking, due to the influence of gravity, there are more sand casting defects on the upper surface of steel
The gear blank is made of 20CrMoH, which belongs to low alloy structural steel. The liquidus temperature reaches 1511 ℃,
Using 340mm feldspar ink probe, add ultrasound into the spheroidizing bag, the action time is 1min, and the indication of
The finite element analysis software ProCAST is used to simulate the flow field and temperature field in the iron mold
Due to the high pouring temperature of steel castings, in order to improve the heat resistance of coated sand, special
Casting process refers to the process of pouring high-temperature liquid metal into the mold to obtain a certain shape of
1.Casting Porosity Casting porosity is a common defect that can occur during the casting process in manufacturing. It refers to
After spheroidizing, the experimental molten iron is poured into the mold, ultrasonic wave is applied to one of the cavities,
The certain type of broken axle housing is mainly used for tractor load-bearing bridges, with an annual output of 10000
This part of the experiment was carried out just after the arrival of the ultrasonic equipment. The main purpose is
1. Process optimization By analyzing the defects of the original process scheme in combination with figure 1, it can be
Compared with gray cast iron, nodular cast iron has strict requirements for chemical composition. The raw molten iron of nodular
According to the actual size and casting process of crankshaft, the laboratory test is reasonably designed. The iron mold is
One of the most important parameters in the iron mold sand coated casting process is the thickness of the sand