Casting finally formed mainly through the liquid metal cooling solidification, in casting production process, if there is no good grasp of the casting process can lead to the quality of the casting line problem, affect the use of the casting performance and service life of the casting. Therefore, two aspects of control should be paid attention to during the casting process.
(I) control of casting dimension and surface roughness
In the field of modern manufacturing, are increasingly demanding for the accuracy and quality of casting, casting of near net shape technology to change the traditional concept of the casting only provide blank, its aim is to reduce material consumptions, energy consumption, the labor cost, and improve the interior and exterior quality of products, market and high benefit. However, the dimension precision and surface roughness of the casting are difficult to control due to many factors. Casting is liquid forming, realize near net shape has unique advantages, in the aspect of structure inner cavity and appearance of the casting forming at a time by casting method, make it close to the final shape of parts, machining and assembly process to a minimum; In terms of dimension accuracy and surface quality, the final requirement of the casting can be close to the product. On the other hand, the original surface of the cast is beneficial to maintain the excellent performance of corrosion resistance and fatigue resistance of castings, thus improving the product life.
Formation and control of crystallization and solidification organization
Liquid metal structure, the formation of crystal nucleus and grew up, such as grain size, direction and form is closely related to the casting solidification organizations, their physical properties and mechanical properties of castings have a significant impact. Control of casting solidification organization is the organization in order to get what they want, the purpose of the solidified structure to control, it must, the formation process of its formation mechanism and influence factors have a comprehensive understanding and further research. The methods of effective control organization have been established, such as metamorphism, gestation, dynamic knot, sequence solidification, rapid solidification, etc.
In the casting production, control the above two aspects of the problem, can guarantee the shape of the casting and the dimension precision, can reduce the expenditure of the cost to some extent, strive for the market benefit.
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