What are the causes of damage to precision castings?

I believe you also know that damage during the casting process is inevitable, but we know that the causes of damage can be avoided as much as possible, so as a professional casting manufacturer, today we will introduce the reasons why the carbon content of castings exceeds the standard.

1. The selection of mold materials for castings is unreasonable. In the selection of white mold materials for castings, one is that the carbon content is high, and the other is that the density of the white mold is too high. Therefore, the carbon content of the casting mold is higher during the thermal decomposition process during the pouring process. , making the liquid phase and mist free carbon content of the castings higher during the pouring process, resulting in an increased probability of carburization of the steel castings.

2. The carbon content in the smelting components of cast steel production is not strictly controlled, especially the carbon content in various scrap steels and whether there are other alloy components in various scrap steels.

3. There are many pattern combination bonding surfaces in castings. The quality of pattern combinations is poor. The combination surface is not smooth and flat, resulting in an increase in the amount of glue during combination bonding and an increase in the carbon content of its thermal decomposition products.

4. The selection of white mold adhesive is unreasonable. First, there are no requirements for the material quality and component content of the adhesive, and adhesives with high carbon content are used; second, the selected adhesive has poor bonding ability, resulting in a large amount of white mold combination adhesive; During the pouring process, the carbon content of the thermal decomposition products of the adhesive is increased and the probability of carburization of the cast steel is increased.

5. The pouring molding design in the setting of the casting pouring system is unreasonable. Since the carbon content of cast steel products is low when producing low carbon steel castings, if the pouring molding method of the casting is not designed reasonably, the carbon in the thermal decomposition products of the casting will diffuse into the casting. The probability increases, leading to carbon penetration and carburization.