On the occasion of the whole nation welcoming the opening of the Shanghai World Expo, on April 27th, a good news came from Huayi Group: A commercial truck tire launched by Shuangqin Group Co., Ltd., which is owned by the group, obtained the US Environmental Protection Agency (EPA). The top certification. As a result, Shuangqin Group became the first tire enterprise in China to have passed the EPA certification, and obtained an access permit for China to become a global “green tireâ€.
The US Environmental Protection Agency's “Smartway†certification is a third-party argumentation of an international authoritative testing agency. It mainly encourages consumers to purchase cars that have passed this certification and cars that include tires. Accessories. Previously, only products from companies in the United States, France, Japan, Germany, and South Korea passed this certification worldwide. According to EPA's confirmation, the Shuangqin Group's commercial truck tires (pattern FT105) can reduce nitrogen oxide emissions and save more than 3% of fuel. According to this calculation, for every one of these tires used, 240 to 400 liters of diesel can be saved, which is equivalent to reducing carbon dioxide emissions by 750 to 1250 kg.
Chairman of Huayi Group and Chairman of Shuangqin Group Liu Xunfeng introduced that Shuangqin Group has long adhered to the concept of technological leadership, paid attention to the development trend and development of technology in domestic and foreign industries, and closely integrated social responsibility for environmental protection and sustainable development with enterprise development. Together. In February 2008, Shuangqin Group formally proposed the concept of “green tiresâ€, and aimed at the industry's international advanced standards and international advanced standards, and set up a research topic. At the end of 2008, the Group increased investment in science and technology funds, vigorously promoted the research and application of innovative technologies, broke through a number of technical difficulties and bottlenecks, and completed a number of technological innovations through meticulous organization and design. The successful development of this product symbolizes that Shuangqin Group has made breakthroughs in independent innovation and it also marks that China's tire industry has its own "green tire."
It is understood that energy-saving and new energy vehicles are the development direction of future automobiles, and it is crucial to save energy for tires that affect the energy consumption of automobiles by about 20%. “Green tire†refers to a new generation of tire products with advantages such as smaller rolling resistance, lower fuel consumption, more wear resistance, and comfortable ride than existing radial tire products, highlighting environmental protection, energy saving, new processes, new materials, etc. The advantages in many aspects are the concentrated expression of tire technical progress. At present, the developed countries such as the European Union and the United States have already enacted legislation to impose limits on the rolling resistance of tires, hoping to further reduce the fuel consumption and exhaust emissions of the vehicles through tire technical progress.
"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.
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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.
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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.
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Once the part has cooled sufficiently, the die is opened, either manually or utilising mechanical methods.
Advantages
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Good dimensional accuracy
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Smoother cast surface finish than sand casting
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Improved mechanical properties compared to sand casting
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Thinner walls can be cast compared to sand casting
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Reverse draft internal pockets and forms can be cast in using preformed sand core inserts
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Steel pins and inserts can be cast in to the part
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Faster production times compared to other processes.
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Once the tolling is proven, the product quality is very repeatable.
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Outsourced Tooling setup costs can be lower than sand casting.
Gravity Casting Parts
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