As an ancient industry, the foundry industry has made tremendous contributions to the development and progress of human civilization during the course of thousands of years of human development. As early as 5000 years ago in the Shang Dynasty, it was known as a miracle in the world that casting cups for drinking, chimes for musical instruments, bronze tripods for worship, and weapons for war. Bronze casting is very developed. A total of 64 bronzes were unearthed in Qixian County, Hubei Province. The total weight was more than 5 tons. In fact, it was majestic, beautifully cast, fine lines, and pleasing to the ear when it was struck. It was deep and honest, and the music was harmonious and exciting. In the Han Dynasty, cast iron casting has become a scale. A variety of agricultural tools, smashing with swords and cannons, decorative iron man, iron horse, Fang Ding, a wide variety. Archaeological finds that malleable cast iron was already widely used in China. However, in the 1670 AD, the West invented the white heart malleable cast iron. The technology of cast iron production in ancient China was more than 1,000 years earlier than in Europe.
Into the 20th century, the rapid development of casting, one of the important factors is the progress of product technology, requiring all kinds of mechanical physical properties of the casting is better, while still has a good mechanical processing performance; Another reason is the mechanical industry itself and other The development of industries such as chemical and instrumentation has created favorable material conditions for the foundry industry. In the more than 50 years since the founding of the People's Republic of China, the gravity casting industry in China has grown from scratch. Gravity casting production has achieved considerable development. With the development of industries such as automobiles, motorcycles, household appliances, and computers, the demand for gravity casting parts has increased. , to produce high-quality, precision, large gravity casting parts of the gravity casting industry has been high-speed growth and development.
At present, China's annual output of castings has exceeded 31 million tons, ranking first in the world, and it is a world-leading foundry and production country. Because the quality of the products in the foundry industry is not guaranteed, and the reject rate is high, under the conditions of China’s reform and opening up and economic development, as well as the fierce competition in the international market, strict control of casting production is required to ensure the quality of castings. Improving the cycle of trial production, reducing the cost of castings, increasing the competitiveness, improving economic efficiency, and accelerating product renewal and technological upgrading have very important practical significance for the promotion of the technological transformation of our traditional industries and the development of the national economy toward the healthy development of quality and efficiency.
From the early 60s, the solidification simulation technology was first used to conduct temperature field research. After decades of efforts, the development of computer simulation technology for the casting mold solidification process has entered the stage of practical engineering, casting process design and implementation also It is gradually moving from experience to science. In recent years, with the further development of computer technology, computer-aided design of casting process, numerical simulation of casting solidification process and many other technologies have been more and more widely used in foundry production engineering. The numerical simulation technology of the casting process plays an irreplaceable role in transforming and upgrading the traditional casting technology, reducing the product cost, and improving the competitiveness of the foundry company. Its extensive application will certainly bring huge economic and social benefits to the foundry industry.
The numerical simulation system for filling solidification of castings mainly includes several major modules of pretreatment, filling calculation, solidification calculation and post-processing. The simulation of the solidification process of the casting includes the calculation of the temperature field and the prediction of shrinkage shrinkage and shrinkage. It is called by the scholars a macroscopic simulation of the solidification process of the casting. At present, the general simulation of temperature field has matured, and predictions of defects such as shrinkage and shrinkage have also been deeply studied. For numerical simulation software, the prediction of shrinkage and shrinkage is one of the main objectives of solidification calculation, and it is also one of the main functions of most solidification simulation software. However, the promotion and application of software are still not perfect.
ADC12 aluminum-silicon alloy has a high strength and corrosion resistance, small thermal expansion coefficient, good cutting performance and excellent casting properties are widely used in automotive cylinder block, cylinder head, locomotive shock absorber, engine gear box, agricultural machinery gear box and other zero part. In recent years, with the rapid development of the automobile and motorcycle industries, the shape of the brake pump housing and the shock absorber housing of the small-sized automobile are relatively complex, and the strength and precision are required for mass production. Small parts.
