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Application of Chills
A chill is one of the most commonly used metal blocks for controlling the solidification of castings. Chills can be used for all types of casting alloys, but they are most widely applied in steel castings. The main functions of chills are as follows: 1. Used together wit...Read more -
Filling Ability of Liquid Metal
Concept of Filling Ability of Liquid Metal (1) Filling Ability of Liquid Metal The ability of liquid metal to completely fill the mold cavity and form a casting with complete shape and clear contours is referred to as the filling ability of liquid metal. In most c...Read more -
Formation and Prevention of Pores in Cast Iron Castings
The existence of pores in cast iron castings not only reduces the effective cross-sectional area of the cast iron parts, but also causes stress concentration around the pores, becoming the source of cracks in the material fracture. The most serious is that the pores are ...Read more -
Growth of Cast Iron
When cast iron components operate at high temperatures, they may undergo an irreversible dimensional expansion known as growth. This phenomenon not only reduces the strength of the cast iron but can also damage other components in contact with it. Cast iron growth is mos...Read more -
Internal Defect Inspection of Castings – Radiographic Testing
Internal defects of castings refer to various defects that exist inside castings and destroy the density or uniformity of castings, such as internal shrinkage, shrinkage, pinholes, pores, inclusions, internal cracks, segregation, etc. For these defects that are not expos...Read more -
Common Methods for Testing and Sampling Mechanical Properties of Castings
The mechanical properties of castings are important indicators of the quality of most castings and are often used as the basis for acceptance. However, it is very difficult and usually impossible to apply the same load to the castings as the working conditions to measure...Read more -
Gray Cast Iron Performance – Service Properties
Machines operating under different conditions require gray cast iron components to have service properties that cannot simply be characterized by conventional mechanical properties. Designers and manufacturers must give this due attention. Wear Resistance Gray cas...Read more -
Gray Cast Iron Performance – Mechanical Properties
The mechanical property data of gray cast iron is generally obtained from separately cast ⌀30mm test bars. Since the microstructure and mechanical properties of gray cast iron are significantly affected by the cooling rate during the solidification and eutectoid transfor...Read more -
Coating for Moulds in Foundry Casting
To enhance the mould' s resistance to molten metal, reduce the surface roughness of the casting, prevent sand adhesion, and improve the surface quality of the casting, a special mixture is applied to the working surface of the mould. This mixture is known as mould coatin...Read more -
Classification and Characteristics of Pores in Castings
When the concentration of gas in metal exceeds its solubility, or when the invading gas is not dissolved by the metal, it will exist in the liquid metal as bubbles in molecular state. If the bubbles do not have time to float up and be discharged before the solidification...Read more -
Classification of Coated Sand
Overview Before molding and core making, the molding sand and core sand with a layer of solid resin film on the surface of the sand particles are called coated sand. Coated sand was originally a kind of thermosetting resin sand. The process is to mechanically mix powdere...Read more -
Detection of Castings Weight Deviation
Related Terms 1. Nominal Weight of Castings This includes the machining allowance and other process allowances, serving as the reference weight to measure the weight of the inspected casting. 2. Weight Tolerance of Castings The allowable range of variation in the wei...Read more
