In the afternoon, Xiao Bian was quietly typing in front of the computer. Suddenly a website news broke out with such a message: "The inspection team of the Ministry of Environmental Protection has almost lost his way to dusting the dregs." Seeing this news moment made Xiao Bian laughter. However, this also reflects the seriousness of the imperial capital smog.
Although the red warning was resolved, the hazy weather had not faded in the past few days. In this kind of weather, it is necessary for the owners to understand several types of car-impending measures. Although it is a cliché, Xiaobian hopes everyone can pay attention to it. This is closely related to your own health.
The first is that the windows are closed. For your health, please do not open the window for ventilation. The task of ventilation should be given to the air-conditioning filter. The circulation of the vehicle will be opened to reduce the chance of air circulation between the inside and outside of the vehicle. This will effectively improve the air quality inside the vehicle and avoid direct facial blows. The air outlet can be adjusted downwards. If you are particularly sensitive, you can also wear a mask in the car to drive. However, it should be noted that it is advisable to wear a mask that does not affect the safety of the vehicle. The mask must not be too large or too loose or too loose.
For driving, front and rear fog lights need to be turned on. The light of the fog lamp helps to penetrate the fog, allowing you to discover other people and let others discover you and avoid danger. However, it is necessary to pay special attention to the fact that high beam lights must not be switched on! Severe hazy weather There is a lot of moisture in the air, and the light of the high beam light will be reflected back by the water, causing the phenomenon of “white and whiteâ€. Therefore, opening the high beam light in the fog is no different from suicide! After the haze days have passed, the air-conditioning filter replacement cycle can be appropriately shortened. Because the hazy air is dirty, if it is not cleaned or replaced in time, it will easily cause secondary pollution to the air inside the vehicle and affect the health of the occupants.
"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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