It is worth noting that all kinds of chemically bonded sand are flourishing, and clay green sand is still the most important modeling material. Its wide application range and large consumption are unmatched by any other modeling material. According to reports, more than 80% of U.S. steel castings are made of clay green sand;
In Japan’s steel castings, more than 73% are made of clay green sand. The ability to adapt to modeling conditions is also a major feature of clay green sand. In 1890, the shock pressure molding machine came out. The clay green sand, which has been used for manual molding conditions for a long time, was extremely successful in machine molding, and laid the foundation for the mechanization and automation of subsequent molding operations. Modern high-pressure modeling, jet-pressure modeling, air-punching modeling, static pressure modeling, and non-shock vacuum pressure modeling are all based on the premise of using clay green sand.
The implementation of various new processes has made clay green sand more important in casting production, and it has also caused clay green sand to face many new problems, prompting us to continuously strengthen the research and understanding of clay green sand.
Nowadays, with the rapid development of science and technology, the demand for castings in various industrial sectors continues to grow, and at the same time, the requirements for the quality of castings are getting higher and higher. In modern foundries, the productivity of molding equipment has increased to an unprecedented level. If the performance of the molding sand cannot be fully adapted to the specific production conditions, or the stability and consistency of the molding sand cannot be effectively controlled, it will not take long for the foundry to be buried among the waste products. in.
With the development of science and technology, foundries that use clay green sand generally have sand treatment systems suitable for their specific conditions, including:
- The treatment of old sand
- The addition of new sand
- Auxiliary materials
- The mixing of molding sand
- The monitoring of molding sand performance.
There are many constantly changing factors in the clay wet sand system. If one or several key performances cannot be kept within the control range, problems may occur in production. An effective sand processing system should be able to monitor the performance of the molding sand, and if there is any problem, it should be able to correct it in time.
Due to the different arrangements of sand treatment systems in various foundries and the different equipment used, it is impossible to draw up a set of general control methods. Here, I intend to put forward some control points that have been widely recognized. After each foundry carefully understands these points, it can determine feasible control methods according to its own specific conditions. Moreover, with the advancement of technology and the actual capacity of the factory (including personnel and funds), the control of the molding sand system must be continuously improved.