Matters Needing Attention in The Production Of Container Corner Castings
If the cooling process of container castings is not good, it will affect the service life of container castings, and finally affect the service life of container castings. Therefore, two aspects of control should be paid attention to in the manufacturing process of container corner castings.
（1） Control of dimensional accuracy and surface roughness of container corner castings
In the field of modern manufacturing, the requirements for the precision and quality of container corner castings are higher and higher. The near net shape technology of container corner castings changes the traditional concept that casting can only provide blank. Its purpose is to reduce material consumption, energy consumption and labor consumption, improve the internal and external quality of products, and strive for market and high efficiency. However, due to the influence and restriction of many factors, the dimensional accuracy and surface roughness of container corner castings are very difficult to control. The casting is formed in liquid state, which has unique advantages to realize near net shape. In terms of structure, the inner cavity and shape of the casting are formed at one time by casting method to make it close to the final shape of the parts and minimize the processing and assembly processes; In terms of dimensional accuracy and surface quality, make the casting close to the final requirements of the product and achieve yuan margin or small margin; On the other hand, the retained casting original surface is beneficial to maintain the superior properties of corrosion resistance and fatigue resistance of the casting, so as to improve the service life of the product.
（2） Formation and control of crystallization and solidification structure
The structure of liquid metal, the formation and growth of crystal nucleus, the size, direction and morphology of grains are closely related to the solidification structure of container corner castings. They have a significant impact on the physical and mechanical properties of container corner castings. The purpose of controlling the solidification structure of container corner castings is to obtain the desired structure. In order to control the solidification structure, we must have a comprehensive understanding and in-depth study of its formation mechanism, formation process and influencing factors. At present, the effective methods of controlling microstructure have been established, such as metamorphism, inoculation, dynamic solidification, sequential solidification, rapid solidification and so on.
In the production of container corner castings, controlling the above two problems can ensure the shape and dimensional accuracy of container corner castings, reduce the cost to a certain extent and strive for market interests.
