According to the statistics of the Ministry of Agriculture, as of the end of June 2014, the area of ​​arable land that Chinese households contracted to manage has reached 380 million mu, accounting for 28.8% of the total area of ​​household contracted arable land. In 2014, China's land contractual management rights certification trials have been steadily advancing. At present, the pilot coverage area has reached 330 million mu. The pilot project in 2015 will be further expanded to cover an area of ​​about 500 million mu, which means that one-fourth of China's farmland contracting management rights are expected to be granted warrants next year, and land transfer will be smoother in the future.
“Modern agriculture bid farewell to the past sickening impressions, but it is an organic combination of big machines, big equipment, big technology, large talents, and big markets. Without the simultaneous implementation of land reform, these will only be a vision.†Lu Zhongmei, Dean of Hubei University of Economics, said.
With the strong support of the national policy, China's agricultural modernization will enter the fast lane and high speed. Under this background, the mechanization of grain drying will usher in great development. In the near future, various kinds of food drying machines, such as corn dryers, rice dryers, and wheat dryers, will play an important role in the post-production drying of grain in China and provide escort for the national food security.
"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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