The development of aerospace industry is inseparable from the support of the casting industry. Some large aircrafts often need to use a lot of castings. If the quality of the castings can not be guaranteed, the final products will not be of good quality. The requirements for casting quality should be: to ensure both the external accuracy and the internal quality of the casting, in order to achieve this, we need to constantly explore the casting technology. The production of precisiontechnology can ensure the quality of castings, and this technology is very convenient for production, there is no high demand, so it is very necessary to study this technology.
Foundry industry is a very traditional industry, and anything people use in their life can not be separated from foundry. China’s foundry technology has a long history, with a splendid history of more than 6000 years, and there are many technologies developed in this area. During the Shang Dynasty, people had already mastered a very high bronze culture. In recent years, the number of castings in our country is increasing gradually, and there is a trend to develop into a large foundry country. In recent years, the annual output of castings in our country has reached 10 million tons, which provides convenience for the production of various fields in our country. However, the level of castings in China is gradually improving, and the quality of castings tends to the international level.
In the field of aviation, the requirements for castings are higher. In the past, China imported more castings from other countries due to its underdeveloped technology. However, with the rise of China’s science and technology, the level of castings in China has improved, and the castings produced have been gradually applied in the field of aviation. Compared with the past, the current technology has been improved significantly, because the quality requirements of castings in China are also gradually improving. There are many requirements for casting machining alone. It is not only required that the casting lift angle should not be large, but also that the machining allowance should be small. It is required that all indexes should not exceed the standard, and the internal quality of castings should meet the requirements.
In recent years, foreign countries have gradually innovated some new casting technologies, which also have many advantages. However, in the actual production process, sand casting is the most common way, because sand casting is more economical and cheap, and has high flexibility in production, which can be used in many fields. In recent years, in order to ensure the quality of castings, researchers continue to study the casting technology. At this time, the precise sand casting technology appeared, once it appeared, it caused widespread concern in the casting industry.
In short, precision sand casting technology refers to a kind of casting method, and this kind of casting method refers to a kind of casting method with sand mold as the mold, zero defect manufacturing and near net shape as the goal. In the process of using this casting method, the production efficiency is very high, and it can be used in various ranges. At the same time, the castings produced have high quality, and the external precision and internal quality are very high. In order to obtain such castings, this paper mainly introduces two kinds of casting technology, namely rapid prototyping manufacturing technology and transfer coating technology. One is to ensure the external precision of castings, the other is to ensure the internal quality of castings. The combination of these two casting technologies can produce high quality castings.