ZHY casting successively adopts two trial casting schemes of bottom injection and top injection to produce the complex ductile iron […]
By individually adjusting the corresponding parameters of the example, we can intuitively understand the influence of these conditions on the
Graphite expansion will occur in the solidification process of iron castings. While the liquid metal shrinks, the graphite expansion in
The material of a flat casting is aluminum alloy alsi17cu3. The liquidus temperature is 636 ℃, the solidus temperature is
The methods for solving the differential equation of heat conduction in solidification process mainly include finite element method (FEM), finite
The high appearance quality of lost foam casting products is one of its advantages, but its internal quality is difficult
The castings without riser system were introduced into magma, and the pouring posture of the connecting flange at the top
Taking the circular casting defect with radius r as an example, the influence of the distance between the hole center
The setting of simulation pretreatment mainly includes the selection of simulation items, material selection rules, heat exchange conditions, pouring conditions
Fig. 1 shows the current mainstream pump casing casting process. The water system is injected at the parting surface height
The shape of casting defects includes a variety of irregular shapes, but the effect on stress concentration can be attributed
In order to make the simulation results compare with the measured temperature curve, the established geometric model should be the
1.First process improvement and verification tracking (1) Change to bottom pouring system. The layout of the ingate of the casting
Through the discussion and application of metal subsidy, dark subsidy and heat subsidy, it can be seen that these three
Combined with the actual solidification process of sand castings, the three-dimensional model is established through UG, and ProCAST is used
The change of interfacial heat transfer coefficient with time obtained by back calculation can only be used to determine the
Another subsidy method that does not require product structure design changes is heating subsidy. The heating subsidy is to add
According to fracture mechanics, once the position of a certain point in the area near the top of the casting
After the interface heat flow and temperature field data are solved by the inverse calculation program, the part of the
Since there are certain limitations and uneconomies in increasing metal subsidies, it is necessary to consider a process scheme that
For commonly used aluminum alloy materials, the crack propagation life and crack nucleation (initiation) life account for about 30% ~
According to the macroscopic definition formula of interface heat transfer coefficient, it is necessary to know the temperature T1 of
Metal subsidy is one of the most common subsidies. Metal subsidy refers to the structure subsidized on the basis of
As for the calculation of the stress intensity factor of casting defects, scholars have made a lot of efforts and
The temperature data at the thermocouple measured in the experiment are sorted into the data form required by the inverse
Casting refers to the process of melting solid metal into liquid, pouring it into a specific shape of mold, and
The three groups of pouring test temperature data of ring sand casting during solidification are as follows: Figure 1, figure
The temperature data measured in the solidification process experiment is the basis for solving the interface back calculation. Therefore, it
1. Shorten the production cycle and improve the machining accuracy The mold less casting process adopts computer automatic processing, and
It is inevitable that there are errors in the experiment of heat exchange and temperature measurement in sand mold casting.
