Wheat is widely grown in China, but the quality is very different, and the quality of wheat determines its economic value to a large extent. Therefore, in the determination of wheat quality, it is often necessary to use an automated Kjeldahl tester to measure wheat grain. Protein content, mainly because protein content is an important measure of wheat processing quality, and protein is mainly a complex nitrogen-containing organic compound, so the automatic Kjeldahl determination instrument is used as a professional instrument for determining the nitrogen content of a sample, and it is used in The determination of wheat grain protein is very suitable.
The automatic Kjeldahl nitrogen analyzer is consistent with the classical Kjeldahl method, but the automatic Kjeldahl nitrogen analyzer is based on the classical Kjeldahl method and has been improved and improved. The determination of wheat grain protein content has the advantages of automatic, time-saving, accurate and reduced environmental pollution. Therefore, the automatic Kjeldahl nitrogen determination instrument is also an important detection instrument widely used in all walks of life.
In the experiment, buckwheat 44 and Yannong 19 were taken as test samples, and the wheat grain protein was measured by Top Kleinner's automatic Kjeldahl apparatus to study the accuracy and accuracy of this method. The results of the nitrogen determination method were compared. The results showed that the recovery rate of total nitrogen in whole wheat flour of Wanmai 44 was 99.38-100.35, and the coefficient of variation of 10 times of protein content in Wanmai 4 and Yannong 19 was 0.60 and 0.84, respectively, which accorded with the tolerance of international methods. The significant test showed that there was no significant difference in the results of protein determination between Wanmai 44 and Yannong 19 whole wheat flour by Kjeldahl and Kjeldahl.
By comparison, we can conclude that the results of the automatic Kjeldahl determination of wheat grain protein are in agreement with the results of the classical Kjeldahl method, and that the automatic Kjeldahl nitrogen analyzer and the classic Kjeldahl Compared with nitrogen method, its advantages are more obvious. It not only has good accuracy and accuracy, but also has the features of simple operation, quick and labor saving, and can be widely used for the determination of protein content in wheat kernels.
The domestic current situation of the die-casting mould
Die Casting Mould industry has developed rapidly in our country, the total output growth significantly, domestic die casting mold production after the United States, has become the second in the world, become the veritable die-casting superpower. It can have such achievement because of our country with unique broad market advantages and relatively cheap labor force. Depend on very obvious price in the international trade market, we produced the die casting mould which occupies a bigger superiority, according to the situation, in the future Chinese die casting industry development prospects are very broad.
The designing of die
casting tooling
1, According to the materials, shape and precision product, analyze technology,
decide of the process.
2, Confirm the location of product in the mold cavity. Analyze parting surface,
overflow system and the gating system.
3, Design the various activities of the core are assembled and fixed method.
4, Design the core-pulling distance and force.
5, Design the ejection device.
6, Confirm the die casting machine, design the mould base and the cooling
system.
7, Checking the mould size and die casting machine, drawing the process
flowchart and component of die casting mold.
8, Design is complete.
Die-casting mould making flowchart
Aluminum injection mould material and materials and its properties
Material of aluminum die casting mould: H13, ASSAB DIEVAR, SKD6;
Mould base: #45 steel, standard mould base (LKM);
Hardness after treatment: RHC 48~52;
Standard Configuration: Cooling system;
Tolerance: 0.1mm;
Machining equipment: CNC gantry milling machine, middle-speed WEDM machine, slow-feeding EDM, die spotting machine;
Mould life: 50000 shots ~ 100000 shots;
Lead time of die casting mould: 40 days-60 days.
What is the Moldflow analysis, this conception derived fromtaiwan. it's a precess through the computer for injection molding simulation by data simulate software, and get data result. Then assess the feasibilty of the mold program through these results to perfect mold and production designation.The common software for plastic mold such as moldflow, moldex 3D and so on. And the common software for Aluminum Die Casting Parts such as PROCAST, FLOW 3D and so on.
The conventional materials of die casting core, insert, slider
Production of die casting mould and QC control
Die Casting Mould
Aluminum Die Casting Mould, Zinc Die Casting Mould, Die Casting Mould, Die Cast Mold
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