Wide shallow ship research passed acceptance

Recently, the Ministry of Transport has established a scientific and technological project "Research on the Application of Practical Technologies for Energy Saving and Emission Reduction of Inland Water-wide Shallow Vessels" through acceptance. The project has systematically studied a large number of shallow and shallow vessels on the Yangtze River and proposed a series of energy-saving and emission-reduction technologies. The improvement of technology will help promote the energy saving and emission reduction of inland shipping.

The project is jointly undertaken by the Institute of Water Transportation Science and Technology, the Yangtze River Institute of Shipping, and Wuhan University of Technology. Due to the restriction of navigational conditions, the large-scale vessels in China are characterized by wide and shallow features. The project proposes the technical route options for energy-saving and emission-reduction of inland water transport vessels in China, and points out the direction for further research on energy-saving and emission-reduction technologies; A wide ship-type line design method for inland rivers has developed a practical and simple ship energy-saving appendage device, which has been verified by experiments to achieve an overall energy-saving effect of more than 5%. It has established relationships with water flow speed, ship speed, main engine power, and fuel consumption. The model of dynamic control of the ship's main engine with a certain amount of parameters was developed. The ship's host dynamic oil control simulation software was developed, and the feasibility of the ship host's dynamic oil control optimization program was verified through simulation tests and real ship tests.

"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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