Casting parts are an indispensable mechanical manufacturing component, with a wide range of applications and continuous improvement of production processes. With the continuous development of technology, castings will continue to bring more advantages and convenience to human production and life. Castings are usually divided into various types based on their materials, such as steel castings, cast iron castings, copper castings, aluminum castings, magnesium castings, etc. Among them, cast iron is the main type of casting, which is widely used in mechanical and automotive manufacturing due to its low price, high strength, good toughness, and simple manufacturing process.

Cast iron is an iron-carbon alloy with good flowability and castability, widely used in fields such as machinery, automobiles, and construction. The characteristics of cast iron castings are high hardness, good strength, and strong wear resistance, which are suitable for some components that bear static loads. Iron castings are divided into gray cast iron, ductile iron, white cast iron, etc. according to the material, and different casting materials have different properties and application ranges.

How to handle impurities in Dalian castings to ensure quality?

Accurately control casting temperature

During the casting process, the appropriate casting temperature is very important. Excessive temperature can cause excessive thermal decomposition of metal materials, resulting in too many bubbles and affecting the quality of castings. A low temperature can make the metal material too viscous, have poor flowability, and easily produce defects such as inclusions and sand holes.

Therefore, during the casting process, it is necessary to strictly control the casting temperature, select appropriate furnace temperature and casting conditions, and maintain the molten metal at a suitable temperature for a period of time to ensure the fluidity and deep filling ability of the metal material.

Using innovative casting materials

The formation of impurities in castings is directly related to the mold material. If some low-quality or old mold materials are used, it can also cause bubbles and inclusions formed due to oxidation. Therefore, in order to reduce or eliminate impurities in castings, high-quality casting materials must be used. The commonly used casting materials now include oxide ceramics, gypsum, resin, and silicate.

These novel casting materials have stronger high-temperature resistance, higher thermal diffusivity, and better thermal stability compared to traditional materials, thereby effectively avoiding oxidation and inclusion formation.

Adopting high-quality cooling systems

The control of cooling rate of castings has a significant impact on the quality of castings. If the cooling speed is too fast, it will cause cooling stress and excessive grain size, which can easily cause pits and uneven carbon content in the casting parts; If the cooling rate is too slow, it will reduce production efficiency and easily leave a large number of bubbles and inclusions in the casting.

The casting process is mainly divided into two types: manual casting and machine casting. The former is usually used for small-scale production, while the latter is suitable for large-scale production. Manual casting is a comprehensive process of manual bonding, model making, painting, etc. It is suitable for smaller castings and has a relatively high cost; Machine casting utilizes modern equipment and automated processes for production, with fast speed and low cost, making it suitable for mass production of castings.

Steel castings refer to components produced using steel as a casting material, which have characteristics such as high strength, high toughness, high temperature strength, and wear resistance. They are suitable for some components that withstand high impact and dynamic loads. Steel castings are divided into low alloy steel, high alloy steel, stainless steel, etc. according to the material, and different types of steel have different physical and chemical properties.