Compared with large complex thin - wall castings, civil products have lower requirements on casting quality. However, for the latter, shorten the production cycle, improve the production efficiency of the problem becomes more prominent. The gelation process of common silica sol mainly depends on the dehydration and drying of silica sol, which takes longer time than the gelation of chemical hardening ethyl silicate. Ethyl silicate shell using ammonia dry each layer can be completed in 2h, and the final hardening of silica sol generally takes more than 12h, for some deep holes and other difficult to dry parts of the need for a longer time. At the same time, because the Investment Casting shell needs to be made in layers, each layer needs to be fully dried, to ensure that the lower shell immersion coating will not cause the problem of remelting off, and immersion coating itself, water will be immersed in the dried shell, resulting in a long overall drying cycle. It is a schematic diagram of the production cycle of silica sol shell investment casting under general conditions. As can be seen from the figure, shell making time accounts for more than 50% of the whole casting production cycle. To shorten the delivery time and shell making cycle is the core of the problem. The key factors to shorten the shell-making period can be divided into two aspects: internal cause and external cause. The main internal cause is the characteristics of the binder, and the external cause is the drying condition. Silica Sol Casting industry in China is developing rapidly and its application is also very extensive. Tianhui Machine Co.,Ltd , https://www.thcastings.com
In the international exhibition area of ​​the 2008 China Beijing International Energy Conservation and Environmental Protection Exhibition held recently, Matsushita Electric's latest energy-saving and environmentally-friendly new products attracted many viewers. A person in charge of Matsushita Electrician told reporters that this is Panasonic's latest eHf high-efficiency lead-free energy-saving fluorescent lamp, which applies lead-free technology to high-efficiency fluorescent glass tubes, increases glass transmittance, and improves phosphor luminous efficiency. The brightness of the lamp illumination is improved by 1.6 times than that of the ordinary fluorescent lamp, the power saving is 32%, and the life is increased by 1.5 times.
According to Ito, president of Matsushita Lighting Co., Ltd. and president of the Japan Lighting Industry Association, Panasonic has built a complete set of energy-saving, environmentally-friendly, recycling systems from manufacturing, use, and final recycling to achieve social energy savings. The concept of coexistence of the global environment is transmitted to the Chinese market. It is also hoped that through the promotion and use of eHf energy-efficient lamps, it will contribute to the construction of a resource-saving and environment-friendly society in China.
Panasonic eHf energy-efficient fluorescent lamps, one equivalent to two traditional fluorescent lamps. Ito made a benefit calculation to promote the use of 2 million fluorescent lamps in the Chinese market. The provincial replacement effect will enable China to produce 2 million traditional fluorescent lamps. The benefits of environmental protection and energy conservation are: reducing the use of mercury by 1 million mg per year and protecting 360 million cubic meters of water; saving 255 million kWh per year, equivalent to 250,000 tons of carbon dioxide emissions.
It is understood that according to the planning of the Ministry of Finance and the National Development and Reform Commission, by 2010, China will promote 150 million high-efficiency energy-saving lighting products, with an average daily usage of 5 hours, which can save 2.8 billion kWh for the country, saving electricity costs. Daily electricity consumption in a medium-sized city of 8 million people.
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