In the practical application ofat home and abroad, the lost foam casting of cast iron alloy is the most widely used, its production line appears earlier and more.
In 1985, GM established the first lost foam casting production line in Massena, which is mainly used for the production of aluminum alloy cylinder block and cylinder head. In 1986, Ford invested millions of dollars to build a lost foam casting production line, which is mainly used for the production of castings such as intake and exhaust pipes and oil pan. The production line has an annual output of 2 million automobile intake and exhaust pipes. In 1996, American companies used lost foam casting technology to produce 26000 tons of ferroalloy castings.
In 1991, the Italian company invested US $10000 to build thelunyi automation production line. The annual production of castings can reach 10000-15000 tons, and the scrap rate can be controlled below 1%. In addition to the investment of the company to build the lost foam casting automation production line, other two Italian companies have also built the lost foam casting automation production line.
The advantages of lost foam casting technology have been recognized in many countries and regions, such as Japan, France, Germany, South Korea, Brazil and Taiwan. Moreover, lost foam casting technology has been applied and popularized in these countries and regions, and obvious economic benefits have been obtained.
China is one of the countries that applied lost foam casting technology to practical production earlier, and the number of lost foam casting production enterprises is more. In 1990, Beijing foundry established a production line of lost foam casting with an annual output of 5000 tons; from 1993 to 1996, Wuxi foundry, the first automobile group, Hanjiang group of Hubei Province and other companies spent a lot of money to introduce the production automation production line of lost foam casting. According to incomplete statistics, until the end of the last century, there were more than 40 large and medium-sized enterprises in China using lost foam casting production technology to produce castings in batches or in large quantities, and dozens of lost foam casting automation production lines were successively completed and put into production. In addition, nearly 100 small and medium-sized enterprises in China have built a simple lost foam casting production line with an investment of 300 thousand yuan.
Vibration solidification technology is a physical modification technology that applies vibration in the process of metal solidification to refine the grains of castings and improve the properties of castings. According to the way of applying vibration, vibration solidification technology can be divided into mechanical vibration, ultrasonic vibration and electromagnetic vibration. Among them, mechanical vibration and ultrasonic vibration are the two most widely used vibration modes. Mechanical vibration is a kind of low-frequency vibration, which is used earlier in the process of metal solidification. Its frequency ranges from a few hertz to a few hundred Hertz, while ultrasonic vibration has a higher frequency, which can reach more than 20000 times in one second.
In the process of vibration solidification, according to the direction of vibration application, it can be divided into vertical vibration, horizontal vibration and composite vibration. According to the position of vibration introduction, it can be divided into: upper introduction, bottom introduction and side introduction; according to the continuity of vibration, it can be divided into continuous vibration and discontinuous vibration (periodic vibration and random vibration).
According to the action mode of vibration in liquid metal, it can be divided into indirect action on liquid metal and direct action on liquid metal. Indirect action on the liquid metal is a kind of direct action on the vibration of the prayer type, through which the vibration energy is transferred to the metal flame to promote the movement of the metal solution, such as mechanical vibration; direct action on the liquid metal is a kind of direct action on the metal Pavilion, through the action between the vibration source and the metal solution to promote the movement of the solution, such as ultrasonic vibration. Compared with other vibration solidification methods, applying mechanical vibration in the solidification process is a method with lower cost and easy to be popularized in industrial production. It is an earlier vibration solidification method.