Porosity
Causes: The main culprits behind porosity include trapped gas and shrinkage as the metal cools.
Prevention: To keep these defects at bay, control is key. This means careful management of melting practices and mold design. Techniques like vacuum-assisted casting or modifying the chemical composition of the molten material can help reduce gas porosity.
Shrinkage
Causes: Shrinkage defects occur because metal contracts as it cools down after casting.
Prevention: Incorporating the right gating setups can facilitate uniform cooling and solidifying processes. Additionally, adjusting alloy compositions might be necessary for more consistent results.
Misruns and Cold Shuts
Causes: Misruns and cold shuts are types of surface defects and they occur when the molten metal solidifies before filling the mold cavity completely, leading to incomplete castings. On the flip side, cold shuts happen when two streams of liquid metal fail to unite properly in the mold.
Prevention: To prevent misruns and cold shut defects in castings, ensuring proper gating to promote uniform filling of the mold cavity, along with controlling pouring metal temperature and rate to facilitate complete mold filling and prevent premature solidification, are critical measures. Additionally, maintaining suitable metal flow conditions and minimizing turbulence during casting can help mitigate the risk of these defects.
Slag
Causes: The main culprits behind slag casting defects include improper cleaning of the melt surface before pouring and inadequate gating systems that fail to filter out slag particles effectively.
Prevention: To kick these casting defects to the curb, start by ensuring thorough skimming of molten metal surfaces. Moreover, refining the layout of your gating system serves as a formidable defense to keep slag intruders at bay.
ABOUT KEVA
Keva Casting is a professional casting company that focuses on Construction, Machinery, Automobile, Hardware, Pipeline and many other industries.
We provide top quality products with the best service based on our complete production chain including our own mold design, advanced production techniques, and full management of the supply chain. Keva Casting has two factories located in Zhucheng, China's Shandong province.
We use "shell molding", which is a new technique that has been developed in recent years.This new technique has simplified production procedures and reduced air pollution compared with traditional sand casting and investment casting. Shell making and core making are faster to ensure production in enormous quantities. The dimensions and surface finishing are satisfactory for all kinds of industrial requirements. Besides supplying our own formwork & scaffolding systems, our casting products also supply OEM services in various industries.