Characteristics and technological application of turning sand casting
Sand casting has a long history, dating back thousands of years; its application is everywhere in the world.
It is worth noting that in today's vigorous development of various chemical bonded sand, clay wet sand is still the most important modeling material, its wide range of application, large consumption, is any other modeling material can not match it.It is reported that more than 80% of clay wet sand and more than 73% of clay wet sand.
The ability to adapt to the modeling conditions is extremely strong, which is also a major feature of clay wet sand.In 1890, the shock molding machine came out, and the clay wet sand, long used for manual modeling conditions, was very successful in machine modeling, and laid a foundation for the mechanization and automation of modeling operations.Modern high pressure modeling, jet pressure modeling, pneumatic pressure modeling, static pressure modeling and no shock vacuum pressure modeling are also based on the use of clay wet sand.
The implementation of various new processes makes the position of clay wet sand in casting production more important, and also makes the clay wet sand face many new problems, which makes our research of clay wet sand continue to strengthen and deepen the understanding.
Nowadays, with the rapid development of science and technology, the demand for casting is growing, and at the same time, the requirements for casting quality are also getting higher and higher.Modern foundry, the productivity of modeling equipment has been improved to an unprecedented level, if the performance of the sand cannot fully adapt to the specific production conditions, or can not effectively control its stability, consistency, it may not take long to bury the foundry in the waste.
With the development of science and technology, the foundry using clay wet sand is generally suitable for the sand treatment system with specific conditions, including: treatment of old sand, addition of new sand and auxiliary materials, mixing of sand and monitoring of sand performance.
There are many constantly changing factors in clay wet sand systems.If one or several key performance cannot remain within the control range, problems may occur in production.An effective sand treatment system shall be able to monitor the performance of sand, should be corrected in time.
Due to the different arrangement of each foundry sand treatment system and the different equipment selected, it is impossible to formulate a set of general control methods.Here, it is intended to present some control points that are now widely recognized.After each foundry carefully understands these points, it can determine the feasible control methods according to their own specific conditions.Moreover, the control of the type sand system should be continuously improved with the progress of technology and the actual capabilities of the factory (including personnel and funds).
Since 1977, due to the vigorous development of China's machinery, electronics, light industry, instrument, transportation and other industrial departments, the demand for casting mold is more and more in quantity, the quality requirement is getting higher and higher, and the supply period is getting shorter and shorter.
High production efficiency: high machine productivity, such as domestic J 3 horizontal cold air die cast aluminum 600~700 times every eight hours; die cast aluminum life, one die cast aluminum, die cast aluminum clock alloy, life can reach hundreds of thousands of times, even millions of times; easy to realize mechanization and automation.