At present, the relevant standards of the LED industry have been gradually put into use, with reference to these standard industries to do market regulation and drive the development of the industry. The country's policies that have a greater impact on the LED industry mainly come from two aspects. First, major macroeconomic policies provide a good policy environment for the future development of the industry; second, the series of standards related to LED explosion-proof lamps are conducive to market regulation. The Third Plenary Session of the 18th CPC Central Committee proposed to deepen the reform of the science and technology system, explicitly encourage original innovation, establish a synergy innovation mechanism for industry, university and research, strengthen the main position of enterprises in technological innovation, strengthen the use and protection of intellectual property rights, and integrate scientific and technological planning and resources. China's semiconductor lighting strategy The sustainable development of emerging industries has pointed out the way forward. At the same time, the Semiconductor Lighting Energy Saving and Emission Reduction Promotion Conference hosted by the Ministry of Science and Technology, the Ministry of Science and Technology, the Ministry of Finance and Economics, and the Ministry of Finance and Economics, and the National Semiconductor Lighting Engineering R&D and Industry Alliance also held a conference in Beijing. The meeting affirmed and emphasized the promotion of LED explosion-proof lamps. And to develop the importance of the semiconductor lighting industry in promoting energy conservation and emission reduction, and promoting economic restructuring and upgrading, and on the basis of soliciting opinions on energy conservation and emission reduction work, research and deploy the next phase of semiconductor lighting application promotion work. On the other hand, the issuance of new shares that have been suspended for more than a year has officially restarted. The four semiconductor lighting related companies Abisen, Mulinsen, Kinglite and Crystal Semiconductor will have completed the procedures and listed in a few months. It can be expected that more high-quality LED explosion-proof lamps will join the ranks of listed companies in the future, so as to leverage the advantages of the capital market to accelerate mergers and acquisitions and restructuring, the trend of industry integration. At this stage, domestic and foreign standards on the standard have introduced some documents that have a greater impact on the industry. First, the National Standards Committee and other nine departments have formulated and issued the "Strategic Emerging Industry Standardization Development Plan", clarifying that by 2015, it will build about 60 standard complexes, develop more than 600 urgently needed national standards and industry standards, and formulate a number of pushes. Specific measures for the standardization of strategic emerging industries, including semiconductor lighting. Two national standards related to the semiconductor lighting industry play an important role in regulating the market, guiding consumption, accelerating the penetration of LED lighting products, and promoting energy conservation and environmental protection. It means that China's LED explosion-proof lighting products can be like other home appliances, in the near future, through testing and certification, and put energy efficiency labels on their products, so that end users can understand the energy-saving effect of products simply and intuitively. While promoting LED explosion-proof lighting products can be accepted by users more quickly, it also provides a quantitative basis for various preferential subsidy policies. In addition, the National Standards Commission has also initiated the development of three LED explosion-proof lamp standards, undertaken by the National Key Laboratory of Semiconductor Lighting Innovation, aiming at the development of technical standards, intelligent lighting control of LED explosion-proof lamps, application interface specifications and accelerated testing. Methods and other fields regulate the market, guide the industry, and promote innovation. At the same time, in the standard integration and mutual recognition mechanism, organizations in the industry have also begun to make useful attempts.
"Gravity Die Casting. A permanent mould casting process, where the molten metal is poured from a vessle of ladle into the mould, and cavity fills with no force other than gravity, in a similar manner to the production of sand castings, although filling cn be controlled by tilting the die."
Gravity Die Casting
Sometimes referred to as Permanent Mould, GDC is a repeatable casting process used for non-ferrous alloy parts, typically aluminium, Zinc and Copper Base alloys.
The process differs from HPDC in that Gravity- rather than high pressure- is used to fill the mould with the liquid alloy.
GDC is suited to medium to high volumes products and typically parts are of a heavier sections than HPDC, but thinner sections than sand casting.
There are three key stages in the process.
- The heated mould [Die or Tool] is coated with a die release agent. The release agent spray also has a secondary function in that it aids cooling of the mould face after the previous part has been removed from the die.
- Molten metal is poured into channels in the tool to allow the material to fill all the extremities of the mould cavity. The metal is either hand poured using steel ladles or dosed using mechanical methods. Typically, there is a mould [down sprue" that allows the alloy to enter the mould cavity from the lower part of the die, reducing the formation of turbulence and subsequent porosity and inclusions in the finished part.
- Once the part has cooled sufficiently, the die is opened, either manually or utilising mechanical methods.
Advantages
- Good dimensional accuracy
- Smoother cast surface finish than sand casting
- Improved mechanical properties compared to sand casting
- Thinner walls can be cast compared to sand casting
- Reverse draft internal pockets and forms can be cast in using preformed sand core inserts
- Steel pins and inserts can be cast in to the part
- Faster production times compared to other processes.
- Once the tolling is proven, the product quality is very repeatable.
- Outsourced Tooling setup costs can be lower than sand casting.
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