There are not a lot of passengers who are preparing for battery travel by the Qingming small holiday. But do you know that it is not allowed to carry a lithium battery over the standard? Yesterday, the Aviation Security Department of Shijiazhuang Airport issued a lithium battery (including charging treasure) limited reminder to remind passengers to travel safely.

Yesterday, the official Weibo of the Aviation Security Department of Shijiazhuang Airport released a limited-point reminder on lithium batteries (including charging treasures). Weibo said that small lithium batteries (rated energy less than 100Wh), do insulation measures, can be carried around; medium-sized lithium batteries (rated energy between 100-160Wh), do insulation measures, and approved by the airline, this specification The spare battery can carry up to 2 pieces per person; large lithium batteries (rated at 160Wh or above) are prohibited from being carried around, and it is forbidden to check in the baggage. If it is necessary to transport, please follow the shipping dangerous goods process.

How should the rated energy of a lithium battery be calculated? In Weibo, the unit of the rated energy of the lithium battery is mentioned as "Watt hour" (Wh).

It is understood that most lithium-ion batteries directly indicate the rated energy, but some lithium-ion batteries do not directly indicate the rated energy. The specific conversion formula is: rated energy (Wh) = battery capacity (Ah) × discharge voltage (V). Among them, 1Ah = 1000mAh.

Take a mobile phone battery as an example, the battery capacity is 1700mAh, the discharge voltage is 3.7V, and its rated energy is 6.29Wh by the conversion formula.

Yesterday, the reporter interviewed the head of the security inspection of the Aviation Security Department of Shijiazhuang Airport. The person in charge said that the state has strict implementation standards for passengers carrying lithium batteries, and the restrictions on the belts are also issued in accordance with the regulations. In normal security inspections, passengers generally carry a spare battery for mobile phones or carry a spare battery for laptops. Will exceed the standard. However, some batteries, such as lithium battery wheelchairs, are over standard. "So, it is recommended that passengers carrying electronic devices should only carry a spare battery with them on board, so as to avoid unnecessary troubles caused by the line."

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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