The history of the development of China's foundry industry
The brilliant brilliance of the foundry industry has been invented in China's history. The exquisite beauty of the bronze of the Shang and Zhou dynasties in the three generation of Xia Dynasty is now amazing to the general people. However, in modern times, the gap between China's foundry industry and the world's advanced standards is also worrying. During the year from October 8th to twelve, the casting week of China was held in Dalian. The main internal meaning is to carry out technology exchange and discuss the trend and future of foundry industry. Chongqing foundry。
The foundry industry is an important part of the manufacturing industry, the development of the national economy and the important effect, casting technology is essential to making technology. Although China has become a world casting country, its output is the first in the world for 3 years, but it is far from a powerful casting power. What is the difference between China's foundry industry and the international advanced level? Where will the foundry industry go? The problems that will affect the quality of foundry products must wait for a lot of people in China to think deeply. This report will be reflected by this report from this report.
The foundry industry is an important part of the manufacturing industry, strengthen national defense strength and progress of national economy plays a vital role. Casting is the foundation of transportation, petrochemical, steel, electric power, shipbuilding, textile and equipment manufacturing. Advanced casting technology is the essence of advanced manufacturing technology. The number of relative counts shows that in 2002, China's casting output was 16 million 260 thousand tons, and the 3 year in the world was ranked first in the world. Although China's casting output has leapt to a large foundry country, it is far from a foundry power in terms of comprehensive quality, material structure, cost, energy consumption, efficiency and cleaning production.
Since the founding of new China, through the construction of 50 years, the manufacturing industry has laid a good foundation, manufacturing industrial added value accounted for 35.75 of GDP one hundred percent. Up to now, China has been a big country second only to the United States, Japan and Germany, but it still has a very big gap with the developed countries. Liu Jingyuan, a senior engineer of Shenyang Casting Institute, pointed out that if we want to turn our construction into a powerful country, we must enter into the social circles first.
Senior experts pointed out that the gap between China's foundry industry and the developed countries is mainly related to the comprehensive quality of foundry, foundry production process and technology and equipment. As far as dimensional precision is concerned, the castings in our country are 1~3 lower than those in the developed countries, and the surface finish is 1~2 higher than that of the developed countries. For example, the smoothness of engine engine cylinder body is 25 microns to 100 microns in China and 12.5 microns to 25 microns in overseas. In the composition of the castings, the proportion of pig iron to the raw iron product is a close index to weigh the quality of the comprehensive structure of a country's castings. The ratio of the total output of pig iron to the total output of pig iron in China has a certain gap with the developed countries. For example, in the United States, the 1996 pig iron accounted for 39.1 one hundred percent of the total output of raw iron and 16.4 one hundred percent in China. In 2001, the United States was 43.3 one hundred percent, and our country was 22.45 one hundred percent. Although the gap is becoming smaller in recent years, the ratio of the total output of pig iron to the total output of pig iron still has a big gap with the developed countries represented by the United States. The chemical composition, metallurgical casting material group and performance level, stability are lower than developed country. In terms of the appearance of the castings, the gap between China and the developed countries is also larger.
In terms of foundry technology and equipment and other basic conditions, the gap between China and developed countries is relatively large. Melting furnace, iron high developed countries are widely considered appropriate use of China's foundry, the proportion is very low. The temperature of abroad is 1500 degrees Celsius, and there is a wide range of 1380 degrees Celsius in China. In molding and core making, developed country mass-produced mold casting and small scale, most of that uses high compactability of high pressure and high speed, high injection pressure by plane contact line, that uses natural resin sand core. In our country, only a small number of large companies think it is appropriate to use advanced overseas molding and core making technology. Because of the technological gap, China's investment casting is not refined. There is a great gap between the developed countries and the developed countries.
In the process of design and production processing, foundry machinery model, developed countries are widely considered appropriate and use CAD and CAM software integration technology in our country, in addition to large companies and local medium-sized companies, most small and medium-sized companies still rely on the experience of technicians to preset, manual and simple machinery, casting machinery quasi water production model precision, performance, and reliability of a much lower level than in developed countries, many of the key parts, production model import demand.
There is also a great gap between the developed countries and the developed countries as well as the quality and variety of the foundry, auxiliary materials, and the social morphologic, professional and commercialized supply. The quality of the castings is directly affected by the quality of the foundry and auxiliary materials. With coke as an example, the carbon content of our country is 80 one hundred percent, the developed countries is 90 one hundred percent, the ash content in China is two times higher than in developed countries. Iron impurities in China, composition of flipping and not easily fixed supply, lack of price and high quality scrap. The developed countries foundry modifier, purifying agent, sand, supplementary and refractory material quality, variety, price, technical standards, scientific research development has become a whole system, and even set up a European multinational service system. And so far our country has produced a variety of products
- The wall thickness of the die-casting parts is very important to the quality of the castings
- The brand of the foundry product is the perfect combination of quality and popularity
- The history of the development of China's foundry industry
- The improvement of the quality of the castings is the top priority for the development of the foundry industry
- How to obtain high quality cast iron
- How to improve the entry threshold of the foundry industry
- Process flow of precision casting
- Error prevention in the manufacturing process of sand, rat tail and depression
- Formation of sand, rat tail and depression
- Analysis of common defects in castings -- Sands
- uality analysis of castings
- The foundry mold industry in China still has more space to improve
- The innovation of economic growth in China's castings
- Green casting is the direction of the development of China's foundry industry
- China's casting industry is favored
- Analysis of market competitiveness of Chinese foundry industry