News Center
17
2021
-
02
Foundry: What are the reasons for the excessive carbon content of castings? (Part 2)
Foundry
Foundry: Reasons for exceeding the carbon content standard of castings 7. The gating system of steel castings is not set reasonably. In particular, the configuration of the vacuuming system and the casting sand box or casting process modeling is unreasonable, which causes the vacuum degree in the casting sand box to be unequal and the deviation is too large, or the actual vacuum degree is insufficient during the casting process, and the vacuum pressure gauge shows that it is in line with the technical parameters. The error value makes it impossible for the thermal decomposition products of the pattern to be quickly discharged from the casting cavity, resulting in carbonization or carbon deposition of the casting.
Foundry: Causes Casting Reasons for excessive carbon content in castings
7. The gating system of steel castings is unreasonably set. In particular, the configuration of the vacuuming system and the pouring sand box or casting pouring process is unreasonable, resulting in unequal vacuum degree and excessive deviation in the pouring sand box during the casting process, or insufficient actual vacuum degree, while the vacuum pressure gauge shows an error value that meets the technical parameter requirements, so that the thermal decomposition products of the pattern cannot be quickly and quickly discharged from the pouring cavity, resulting in carburization or carbon deposition of the casting.
8. The pouring molding system of the casting is unreasonably set. When the casting pattern is poured, the gasification time of the pattern is too long, and the filling method during casting is unreasonable, so that the thermal decomposition products of the pattern cannot smoothly enter the slag collecting cavity or riser, prolonging the contact reaction time between the liquid and solid phases in the thermal decomposition products, thereby increasing the carburization probability of the casting.
9. Casting The pouring conditions are unreasonably set. If the process setting of pouring and filling is too long, the temperature of the pouring steel liquid is low during the pouring process, especially for the position where the wall thickness of the casting increases, the solidification speed of the pouring steel liquid is slow, resulting in a long liquid-solid residence time, which promotes the action time of the steel liquid and the thermal decomposition products of the pattern, and increases the amount of carburization and carbon deposition of the steel casting.
Foundry : Lost foam casting is fully applicable to the production of steel castings. Effective production operation control methods are adopted for production operation control management, and the operation quality of smelting, batching calculation, actual batching, material selection, and feeding of castings is strictly controlled to minimize and eliminate the process conditions and conditions of carbon increase, carburization, and carbon deposition during the pouring process, and fully qualified low-carbon steel castings can be produced.
When using medium-frequency smelting lost foam casting of low-carbon steel castings, strictly control the carbon content of the smelting batching, and use high-quality return charge with low carbon content and few impurities for smelting and casting, which can fully produce high-quality low-carbon steel castings. Because the production and smelting of high-quality special steel at home and abroad are mostly made of high-quality return charge.
Casting, foundry, casting
Previous Page
Shandong Gongchen Machinery Technology Co., Ltd.
Contact QQ: 258506508
Mobile Number:15621618888
Phone:0536-7691368 7691229
Fax: 0536-7691229
Contact Email:guisongzhng8@gmail.com
Website:www.shandonggongchen.com Gongchen.China Valve Castings.China
Address: Mucun Town, Fangzi District, Weifang City, Shandong Province
Public Account