Developed countries on the whole advanced casting technology, good product quality, high production efficiency, less environmental pollution, raw and auxiliary materials have formed a commercial series supply, such as in Europe has established a transnational service system. Production generally realizes mechanization, automation, intelligence (computer control, robot manipulation).
In cast iron smelting, large scale, high efficiency, dust removal, microcomputer measurement and control, external heat supply and water-cooled continuous operation cupola without furnace lining are used, casting coke, cupola or electric furnace and cupola are commonly used, and nitrogen continuous desulphurization or rolling bag desulphurization is used to make the sulfur content in liquid iron less than 0.01%. The smelting alloy steel refining uses AOD, VOD and other equipment to make H, O and N in the liquid steel reach several or dozens of 10-6 levels.
In the production of important castings, the material requirements are high, such as ductile iron requirements P≯0.04%, S≯0.02%, casting steel requirements P, S more than 0.025%, the use of thermal analysis technology timely and correct control of C, Si content, with direct reading spectrometer 2 ~ 3 minutes to analyze more than a dozen element content and high precision, C, S analysis and regulation can make the C, S content of ultra-low carbon stainless steel can be correctly controlled, the use of advanced non-destructive testing technology to effectively control the quality of castings.
Liquid metal filtration technology is widely used, and the filter can adapt to high temperature filtration such as cobalt base, nickel base alloy and stainless steel liquid. The grade A pass rate of the filtered steel castings was improved by 13 percentage points, and the tensile strength and elongation of the aluminum-magnesium alloy were improved by 50% and more than 100% after filtration.
The alloy core-wire treatment technology is widely used, which makes the process of ductile iron, vermicular iron and inoculated cast iron stable, the alloying element yield is high, the treatment process is pollution-free, and the automatic control of microcomputer is realized.
Aluminum matrix composite materials with its superior performance has been widely valued and increasingly turned to industrial scale applications, such as automobile drive rod, cylinder block, cylinder liner, piston, connecting rod and other important parts can be made of aluminum matrix composite materials, and has been applied in advanced racing cars; In the process of the development of automobiles to lightweight, the amount of various important automobile parts made of magnesium alloy materials has been second only to aluminum alloy.
Hot blast cupola, two rows of large spacing cupola and oxygen rich air supply are adopted. Electric furnace adopts preheating of charge, reducing melting temperature, improving furnace running rate, reducing opening time of furnace cover, strengthening heat preservation and optimizing melting process by microcomputer control. Small riser casting and no riser casting are widely used in the production of ductile iron. Steel casting adopts thermal insulation riser and thermal insulation subsidy, and the process yield has improved from 60% to 80%. Considering the factors such as high labor cost and poor production conditions, robots are widely used. Due to the strict environmental protection law (9 countries stipulate 100-250mg/m3 for electric furnace dust exhaust, 11 countries stipulate 100-1000mg/m3, or 0.25-1.5kg/t liquid iron; Sand treatment dust removal, 8 countries stipulated 100-250mg/m3.) Foundries attach importance to environmental protection technology.
In the production of a large number of small and medium-sized castings, most of the high density static pressure, jet pressure or gas punching molding mechanization, automatic and efficient pipeline wet sand molding process, sand treatment using efficient continuous sand mixing machine, artificial intelligence sand online control expert system, core making process generally adopts resin sand hot, warm core box method and cold core box method. Investment casting generally uses silica sol and ethyl silicate as binders to make shells.
Use automatic die casting machine to produce casting aluminum cylinder body and cylinder head; A number of iron base alloy low pressure casting production lines have been built. Production of special steel castings by differential pressure casting. The production of various caliber centrifugal ductile iron pipe accounted for more than 95% of the total cast iron pipe, ductile iron pipe accounted for 30%-50% of the annual output of ductile iron.
Successfully adopted EPC technology to mass-produce complex castings such as 4-cylinder cylinder block and cylinder head, with a productivity of 180 types/hour. CAD/CAM/RPM technology is used in process design and mold processing. CIMS technology is used in the specialized and integrated preparation of casting machinery.
The whole process of casting production actively and strictly implement technical standards, casting scrap rate is only 2%-5%; Standard update fast (standard age 4-5 years); Generally ISO9000, ISO14000 certification.
Attach importance to the development and use of Internet technology, have established their own home pages, sites. Foundry industry e-commerce, remote design and manufacturing, virtual foundry and other rapid development.
Changshu Hongqiao Cast Steel Co., Ltd. mainly produces various specifications of carbon steel, high, middle and low alloy steel, stainless steel, heat-resistant steel, high manganese steel, high chromium cast iron. For petroleum, chemical industry, metallurgy, mining machinery, coal mining machinery, wind power, nuclear power, Marine and other industries to provide high-quality steel casting, and export abroad. Which steel casting is of good quality? Cost-effective? Changshu Hongqiao cast steel.