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Casting and degreasing method for pig iron castings

Pig iron castings are hygroscopic materials that easily absorb moisture in the atmospheric environment. During the extrusion process, this material often undergoes hydrolysis, which seriously affects the mechanical properties of the extrudate. Therefore, in the traditional extrusion process, a corresponding drying device will be added to dry the material. This process often consumes a lot of energy. In general, during the entire extrusion process of pig iron castings, the energy consumption of dry raw materials accounts for about 40% of the total energy consumption.
When pouring, the principles of high temperature baking and low temperature pouring should be followed. Increasing the tapping temperature of the molten metal is conducive to the complete melting of inclusions and slag floating, which is convenient for slag removal and degassing, and reduces the slag inclusion and porosity defects of machine tool pig iron castings. Using a lower pouring temperature is beneficial to reducing the molten metal. The gas solubility, liquid shrinkage and high temperature metal liquid bake the cavity surface to avoid defects such as pores, sticky sand and shrinkage.
Therefore, under the premise of ensuring that the mold cavity is filled, the lower pouring temperature is used as much as possible. The process of pouring molten metal from a ladle into a mold is called pouring. Improper pouring operation can cause defects such as insufficient pouring, cold insulation, air holes, shrinkage holes and slag inclusions in machine tools, and cause personal injury.
Because most of the cast iron castings are mechanical products, when they are used, it is inevitable to use some lubricating oil to lubricate the pig iron castings. The following is the method of degreasing pig iron castings.
When using oil on pig iron castings, different people use different types of oil, so there are many ways to remove it.
1. The use of organic solvents, the use of organic solvents is very good, because most substances can be dissolved in organic solvents. And this kind of solvent degreases fast, can be reused without corrosion. However, this solvent also has disadvantages, that is, it is relatively flammable. Therefore, pay attention to fire prevention when using pig iron castings.
2. Chemical degreasing. This method mainly uses the saponification reaction and emulsification reaction of some alkaline substances to degrease pig iron castings, which can also play the same role.
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