Ship fuel energy saving and emission reduction new technology research project started

It is understood that the research project on energy saving and emission reduction of marine fuels jointly carried out by the World Maritime Research Center and Zhanyi International Biotechnology (Dalian) Co., Ltd. was officially launched at Dalian Maritime University.
The International Maritime Organization (IMO) last month decided to impose a third limit on nitrogen oxides emitted by ships from 2016 to further reduce urban air pollution. Taking this as an opportunity, the project will significantly reduce the amount of pollutants in exhaust emissions by developing marine diesel fuel additives.
Yang Jian, Executive Director of the World Shipping Center, said that the research and energy-saving product development of this project will provide new research directions for energy conservation and emission reduction work in the future, promote the transformation of scientific and technological achievements into real productivity, and accelerate the formation and development of ship fuel energy-saving and emission reduction industries. .
Up to now, the World Maritime Research Center has successively launched the "Construction of Soft Power in Shipping in the 21st Century Maritime Silk Road", "Research on the Status Quo and Future Development Countermeasures of the Training and Management Model of Chinese Seafarers" and "Study on the Soft Power of Shipping in the Yangtze River Economic Belt" And other research projects.

"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.

Gravity Casting Parts

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