The Spring Festival 2011 is approaching, and the commercial vehicle market has ushered in the traditional peak season. It is learned from such companies as China National Heavy Duty Truck and Weichai Power that they are currently producing at full capacity, and the order situation is also growing slightly year-on-year.
In 2010, the old-fashioned trade-in policy and subsidy for cars to the countryside all came to an end in 2011. The industry's forecast for 2011 is relatively consistent: the high growth of commercial vehicles is no longer expected, and it is expected to return to rationality.
It is understood that the market demand for commercial vehicles in 2011 will remain stable. Rural water conservancy construction has received the attention of the government, which should have a leading role in the domestic commercial vehicle industry, mainly focusing on the demand for agricultural vehicles and light trucks. In addition, it is also a good opportunity for the development of the construction machinery industry. In addition, in 2010, China’s heavy truck market exceeded the one million mark for the first time. In 2011, the market development of commercial vehicles such as heavy trucks was on the basis of explosive growth in 2010, and the increase in the heavy truck industry in 2011 will not be the same as 2010. So big, but it will still maintain a moderate increase. Judging from the performance of the heavy truck market in recent years, the average compound growth rate has reached 15%, and the growth in 2011 will return to a normal state, at least around 15%.
According to reports, the performance of the bus industry in 2011 was mainly affected by changes in the direction of monetary policy and national emissions regulations. Whether it is the reduction of the credit line or the general flow of good liquidity, it will have an impact on the prevailing loan purchase. At present, about 40%-50% of commercial vehicle consumers purchase cars through loans. The monetary policy in 2011 has brought greater pressure and challenges to the sales of the bus industry. It is expected that the country will provide more flexible and open financial platforms and loan channels.
"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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