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Analyze the factors of poor casting quality:
Casting is an important part in mechanical products, which has a great impact on the performance of mechanical products. The wear resistance and dimensional stability of machine tool castings directly affect the accuracy and service life of machine tools. However, there are still many problems in airport castings at present, which factors are related to these problems? Now let''s do a simple analysis.
1. Substandard quality of raw materials used for casting, metal burden, refractory, fuel, flux and other materials will cause casting defects such as blowhole, pinhole, slag inclusion, sand bonding, etc., which will affect the appearance and internal quality of the casting, and in serious cases, the casting will be scrapped.
2. Process operation, to make reasonable process operation procedures, namely the casting structure, the weight and size, casting alloy characteristics and production condition, choosing the appropriate parting surface and modelling, core making method, setting up reasonable casting, cold iron, riser and gating system, improve the technical level of workers, the process procedures implemented correctly.
3. The reasonable design of the casting, carries on the design, in addition to according to the working conditions and the metal material performance to determine the casting geometry shape, size, also must from the perspective of the casting alloy and casting characteristics to consider the rationality of the design, namely the obvious size effect and solidification, shrinkage, stress and other problems, and to avoid or reduce casting copper pieces composition segregation, deformation, cracking and other defects.
At present, the casting price in China is low, but the overall quality is poor, and the economic benefit is poor. Why does this situation occur in China? The main reason is that the competition of domestic foundry enterprises is still in the pure price competition, and the price is used to seize the market, which leads to poor casting quality. In addition, the domestic foundry equipment mainly from abroad, there is no independent development of technology and innovation ability; There is also a shortage of casting technical personnel and senior technical workers in China, and the perfection of casting standard system, the conformity with international standards and the inspection and certification work have not been further strengthened. Compared with other industries, although the foundry industry has been established in terms of scientific research and training, it is still difficult to adapt to the rapidly developing foundry market.
In addition to the technical factors, some external factors should not be ignored. In order to be recognized in the domestic and international markets, China''s castings need to improve the casting quality, form a good competitive environment, develop independently, follow the trend of the international market, and cannot be built behind closed doors.
1. Substandard quality of raw materials used for casting, metal burden, refractory, fuel, flux and other materials will cause casting defects such as blowhole, pinhole, slag inclusion, sand bonding, etc., which will affect the appearance and internal quality of the casting, and in serious cases, the casting will be scrapped.
2. Process operation, to make reasonable process operation procedures, namely the casting structure, the weight and size, casting alloy characteristics and production condition, choosing the appropriate parting surface and modelling, core making method, setting up reasonable casting, cold iron, riser and gating system, improve the technical level of workers, the process procedures implemented correctly.
3. The reasonable design of the casting, carries on the design, in addition to according to the working conditions and the metal material performance to determine the casting geometry shape, size, also must from the perspective of the casting alloy and casting characteristics to consider the rationality of the design, namely the obvious size effect and solidification, shrinkage, stress and other problems, and to avoid or reduce casting copper pieces composition segregation, deformation, cracking and other defects.
At present, the casting price in China is low, but the overall quality is poor, and the economic benefit is poor. Why does this situation occur in China? The main reason is that the competition of domestic foundry enterprises is still in the pure price competition, and the price is used to seize the market, which leads to poor casting quality. In addition, the domestic foundry equipment mainly from abroad, there is no independent development of technology and innovation ability; There is also a shortage of casting technical personnel and senior technical workers in China, and the perfection of casting standard system, the conformity with international standards and the inspection and certification work have not been further strengthened. Compared with other industries, although the foundry industry has been established in terms of scientific research and training, it is still difficult to adapt to the rapidly developing foundry market.
In addition to the technical factors, some external factors should not be ignored. In order to be recognized in the domestic and international markets, China''s castings need to improve the casting quality, form a good competitive environment, develop independently, follow the trend of the international market, and cannot be built behind closed doors.
