The Common Casting Defects of Castings

Release time: 2020-05-29 11:12:00.000


The casting defect is the main reason to cause the reject, and it is a serious threat to the casting quality. What are the common casting defects of castings? There are many kinds of casting defects; The defects that can be repaired are generally air holes, sand holes, slag holes (slag inclusion), shrinkage cavities, shrinkage porosity, cracks and so on. Today, I will give you a detailed description of the appearance characteristics of casting defects, as well as the causes, the purpose is to prevent, reduce and eliminate casting defects, effectively do a good job in casting.
What are the common defects of castings and their causes?
1. Air holes
One of the reasons for air holes is that there is too much water in the modeling material or contains a large number of gas substances; Second, the permeability of molding sand and core sand is poor; Third, the casting speed is too fast.

2. Sand holes
The causes of sand holes are that the strength of molding sand is not enough, the compactness of molding sand is not enough, and the pouring speed is too fast.
3. Shrinkage cavities
Shrinkage cavities are caused by the poor feeding of the castings during solidification.
4. Adhesive Sand
The cause of adhesive sand is the poor fire resistance of the molding sand or the high pouring temperature.
4. Cracks
The causes of cracks are the large difference of wall thickness of castings, improper gating system, and the difference between sand mold and core.
The success of ceramic foundry sand affects all aspects of the casting field and its application is more and more extensive, which enables us to control the product quality more efficiently and accurately, and to produce high-quality parts in line with environmental protection.
The ceramic foundry sand produced by Luoyang Ruiyu has the advantage of low thermal expansion coefficient, and its performance can be comparable to that of zircon sand; Casting expansion defects will not occur when using ceramic foundry sand to prepare molding sand. It is a neutral material, which can be used with acid or alkali binder. It also has a special advantage of not broken, no dust; The ceramic foundry sand has high cost performance and can be recycled repeatedly for hundreds of time.


More News

Problems in Casting Process of Lost Foam Casting

Lost foam casting (LFC) process has been developed rapidly in recent years because of its low investment and low cost.The gating system plays a very important role in the lost foam casting process, an

V-process Casting Technology

The V process casting originated in Japan. It uses plastic film to vacuum to make dry sand molding, that is, physical modeling.Because it does not use binder, shakeout is simple and convenient, the co

It has become a trend for foundry industry to move from tradition to intelligence

It has become a trend for foundry industry to move from tradition to intelligence.The typical application mode of intelligent casting is digital foundry, which uses information technology to manage al



SEO  This website supports IPV6

Website  Luoyang

Business license



Tel:+86 379 65110927
Fax:+86 379 65110921​

Address: Gaolong Town, Yanshi county, Luoyang, Henan, China

Luoyang Ruiyu Ceramic Sand Co.,Ltd.

Mobile site

Luoyang Ruiyu Ceramic Sand Co.,Ltd.

WeChat public account


Looking forward to your letter