The lack of theoretical research is a major bottleneck restricting the development of dryers in China. The physical properties of the materials to be dried are varied, and only a few drying equipments cannot meet the needs of production. Theoretical research is the basis for the development of new dryers. With the development of drying technology in China, it is necessary to cultivate a group of theoretical research and drying technology development workers to improve the technical content of drying equipment in China. In recent years, although some colleges and universities or scientific research units in China are doing this work, the input of human and material resources is far from enough. In terms of theoretical research, there is still a big gap between China and Denmark, Canada, Japan and other countries.
The dryer equipment companies still lack a qualified experimental process. So far, neither the second-hand drying plant nor the theoretical research unit has a perfect experimental base. Drying is a very experimental technique. No matter if it is theoretical research or drying equipment manufacturing, experimental methods are indispensable. Through experiments, theorists can summarize many rules in the drying process. Dryer equipment recycling factories determine various process parameters through experiments. However, many units just ignore the importance of experimentation. Some dryer equipment factories do not even have a set of experimental devices. They have great blindness in equipment design. At present, the weak experimental methods are mainly in these aspects. First, the equipment manufacturers have insufficient understanding of the experimental process and consider it dispensable. The second is that there are many types of experimental devices, and the investment is huge. The non-general enterprises can afford it. The establishment of a sound experimental base is a top priority for China's drying technology research. The third is the lack of experimental personnel, the analysis of experimental results is weak. Some companies do not have a technical person, and they do not even have drawings during the production process. They rely on the estimation and experience of the mechanical processing personnel to produce equipment worth hundreds of thousands and millions of dollars. This phenomenon is not uncommon in the drying equipment industry. .
The other reason that restricts the development of the dryer industry is that although there are numerous dryer equipment manufacturers in China, these plants are mainly concentrated in several regions. An important reason for the concentration of a large number of low-level companies is to facilitate imitation. Dozens or even nearly 100 companies produce the same model, causing you to do what I can do. You can't do it or I can't do it. The specifications and promotional materials of each company are exactly the same, and the contents are strikingly similar. Patented products are rare. The result of this situation can be imagined.
To solve the existing problems in the dryer industry, the entire dryer industry has emerged from the costly mimicry and price war difficulties, and it is only from the basic theoretical research, automation technology and other fields that we devote ourselves to meticulously cultivating ourselves. Independent innovation capability. The low level of automation of domestic dryer equipment and the lag in control means are common problems. With regard to the current level of automation, it is not difficult to solve the control problem in the dryer equipment, but the lack of a reasonable combination of automatic control technology and dryer equipment. As mentioned earlier, different materials have different requirements for dryers. Similarly, there are major differences in the requirements for control methods for different materials.
The role of automatic control in the dryer is well-known, but its one-time investment is also a matter of most concern to people. Sometimes the investment in controlling dryer equipment exceeds the investment in the mechanical part of the dryer. It is also the subject that research should be carried out to determine a reasonable control plan for dryers and drying process requirements and to determine appropriate control measures for specific drying projects.
It can be seen that the development of China's drying equipment industry is still good, but at the same time there are also some problems, which is that we need to work together to improve the industry, in order to deal with customer demand.
"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.
- 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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