The US Department of Energy allocates more than 60 million yuan to support solid-state lighting (SSL) technology

The US Department of Energy (DOE) recently announced a grant of $10 million (equivalent to approximately RMB 61.22 million) to support the development and manufacturing of solid-state lighting (SSL) technologies, including LEDs and OLEDs. According to DOE, the average luminous efficacy of existing LED technology is 150 lumens per watt, and it is hoped that the LED efficacy can be increased by 75 to reach the target value of 250 lumens per watt. In the past ten years, DOE has accelerated the deployment of SSL technology and the benefits are obvious. In 2013, the US energy conservation cost was about 1.8 billion US dollars (equivalent to about 110.20 billion yuan). It is estimated that by 2030, the United States can save energy costs by 26 billion US dollars per year (equivalent to about 159.175 billion yuan). The project supports the following three areas: Core technology research promotes technology development and application research, emphasizing light efficiency, performance and cost objectives; product development and improvement of commercially available SSL materials, equipment or systems; US manufacturing innovation through manufacturing And improved adoption of accelerated SSL technology to improve quality and stability while reducing costs.

Gravity Casting Parts

"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.

1. 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.
2. 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.
3. 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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