Li Dakai: Accelerating Independent Innovation is the Key to Enterprise Development
At the 16th Academic Annual Meeting of the Gear Machining Committee of the Manufacturing Society of China Association of Automotive Engineers held recently, Li Dakai, President of the China Gear Association made a keynote speech. The speech pointed out that the current economic situation in China is gradually improving. In the global economic crisis, integrating various factors, China’s economy has not been severely affected at present. Our domestic demand market is large, but we cannot blindly be optimistic. Companies must still adopt a prudent attitude in their development.
Li Dakai pointed out that accelerating independent innovation is the key to business development. Accelerating independent innovation focuses on “the top five†(strong technical capabilities, strong equipment manufacturing, strong sales services, strong financial and financial management, and strong basic management), and strives to achieve “3X†(innovation, integrity, and concentricity), and work together to create The status of China's gear industry in the world.
The meeting pointed out that China's gear industry has gradually demonstrated the development trend of equipment intelligence, process automation, and management modernization, and has achieved a transformation from scale-speed type to innovation-effective type. The gear industry should adhere to independent innovation and actively promote the "four new technologies" (new materials, new technologies, new achievements, new equipment) to improve the gear manufacturing technology. Although in recent years the strength of our gear industry has been continuously enhanced, production capacity, product quality and service levels have greatly improved, but we still have a big gap from the gear manufacturing powerhouse. First, the industrial competitiveness is not strong, the ability of technological innovation is weak, and the design platform is backward. In particular, key technologies such as automatic transmissions, high-precision high-strength gears, high-strength bearings, and hermetic seals are not yet fully understood. Second, the clusters of gear processing companies are small and scattered, with low levels of specialization and unbalanced development. Third, the gear manufacturing technology is more differentiated and the process capability is not stable. Fourth, modern management and personnel training are still the top priorities for the current industry to study the concept of scientific development. In addition, the shortage of funds invested by enterprises and the lack of joint forces among enterprises are prominent.
"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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