· From June onwards, the Shanghai V standard gasoline was completely replaced with the national V standard gasoline.
On September 1, 2013, Shanghai began to work on the replacement of Shanghai V standard gasoline and national V standard diesel. At that time, because diesel had a national standard equivalent to the European V standard, and there was no gasoline, Shanghai adopted the local standard for gasoline, namely the Shanghai V standard. Since November last year, Shanghai major gas stations have been supplying Shanghai V standard gasoline and national V standard diesel. According to the regulations of the Shanghai Municipal Government, from May 1st, the quality standards for motor gasoline sold in Shanghai must meet the requirements of the National V, and the current implementation of the Shanghai V gasoline standard. In the "Sinopec Shanghai Petroleum Public Open Day" event, the relevant person in charge of Sinopec Shanghai Petroleum Branch said that the quality indicators of the Shanghai V gasoline standard and the national V gasoline standard are basically the same, which are equivalent to the European V standard. Compared with the original Shanghai IV standard gasoline, the main environmental indicators have changed greatly. For example, the limit value of sulfur content is reduced from 50 mg per kilogram to 10 mg per kilogram, which is reduced by 80%; nitrogen oxides, monooxides, carbon Hydrogen compounds are reduced by 15%-20%. The reporter saw at Sinopec Shanghai Petroleum Quality Inspection Station yesterday that the inspectors used a special needle to pump 10 microliters of Shanghai V standard gasoline, slowly inject it into the nitrogen sulfur analyzer, and then use the high temperature heating of the instrument to volatilize the oil; On the computer monitor, it is gradually shown that the fluctuation curve of the sulfur content during the evaporation of the needle tube oil can be accurate to every second. Finally, this syringe oil shows a sulfur content of 8.45 mg per kilogram, which meets the national V standard. At present, there are more than 800 gas stations in Shanghai, of which Sinopec has 582 gas stations in the camp. It is understood that Sinopec supplied 3.5 million tons of gasoline and diesel to Shanghai last year, accounting for about 70% of the total market in Shanghai. Sinopec stipulates that if a gas station receives two complaints about the quality of the oil continuously, the gas station will stop operating for inspection to ensure the quality of the oil sold. CNC Milling Machine is an automatic processing equipment developed on the basis of general milling machine.The processing techniques of the two are basically the same, and the structure is somewhat similar.CNC milling machines are divided into two categories: without a tool magazine and with a tool magazine.The CNC milling machine with a tool magazine is also called a machining center. Cnc Milling,Desktop Cnc Milling Machine,Cnc Milling Machine,Cnc Mill Jiangsu Hoston Machine Tools Co., Ltd. , https://www.haostonmachinetools.com
Features
In addition to the characteristics of ordinary milling machines, CNC milling has the following features:
1.The parts are highly adaptable and flexible, and can process parts with particularly complicated contour shapes or difficult to control dimensions, such as mold parts and shell parts;
2.It can process parts that cannot be processed or difficult to machine with ordinary machine tools, such as complex curve parts and three-dimensional space surface parts described by mathematical models;
3.Parts that can be processed in multiple processes after being able to process a single clamping position;
4.The processing precision is high, the processing quality is stable and reliable, the pulse equivalent of the numerical control device is generally 0.001mm, and the high-precision numerical control system can reach 0.1μm. In addition, the numerical control processing also avoids the operator`s operation error;
5.High degree of production automation, can reduce the labor intensity of the operator. Conducive to the automation of production management;
6.High production efficiency. CNC milling machines generally do not need special process equipment such as special fixtures. When replacing workpieces, it is only necessary to call the machining program, clamping tool and tool data stored in the numerical control device, thus greatly shortening the production. cycle.
Secondly, the CNC milling machine has the functions of milling machine, boring machine and Drilling Machine, which makes the process highly concentrated and greatly improves the production efficiency.
In addition, the spindle speed and feed speed of the CNC milling machine are infinitely variable, so it is beneficial to choose the best cutting amount.