Resolution poor quality factors of casting products

Casting is an important mechanical parts products, the performance of mechanical products have a significant impact, machine wear resistance and dimensional stability of the casting, as well as directly affect the accuracy of the machine life, but now there are still many problems airport castings, These problems arise and what factors do? Here to make a simple analysis.

(1)casting quality of raw materials, metal charge, refractories, fuel, flux and other materials sub-standard quality, will make casting blowholes, pinholes, slag, sticky sand and other defects, affecting the appearance and internal quality casting serious when casting scrap.

(2)process operation, reasonable process to develop rules that, according to casting structure, weight and size, cast alloy properties and production conditions, select the appropriate sub-surface and shape, making the core method, a reasonable set casting bars, cold iron , riser and gating system, improve the skill level of workers, so that technical rules are correctly implemented.

(3)rational design of castings, design, in addition to depending on operating conditions and metal casting material properties to determine the geometry, size, it must also cast alloy and casting process from the point of view characteristic design is reasonable, that is obvious size effect and solidification, shrinkage, stress so as to avoid or reduce the copper segregation member, deformation, cracking and other defects.

At present, China's casting low prices, but the overall quality is poor, poor economic performance, why is there such a domestic situation casting it? Mainly because of the competitive domestic foundry enterprises still remain in the pure price competition, with prices to seize the market, resulting in poor quality castings. In addition, the domestic foundry equipment, mainly from abroad, there is no self-developed technology and innovation capacity; casting our technical personnel and senior technical workers is relatively lacking, and perfect casting standard system into line with international standards and inspection certification work is not further strengthened; compared with other industries, foundry industry in research, training, although established, but also difficult to adapt to the rapid development of the foundry market.

Resulting in poor quality of domestic castings, in addition to technology factors, external factors can not be ignored, our castings want to be recognized on the domestic and international markets, the need is to improve the quality of castings to form a good environment for competition, self-development, tight with the development trend of the international market, not behind closed doors.