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What errors may occur during CNC machining and CNC machining​?

 CNC machining and numerical control machining are a method to control the movement of machine tools and the production process of machining through computer digitization and information digitization. It is an intelligent numerical control device developed as an economical, high-speed, reliable, multi-functional, intelligent, and open structure. CNC machining is also an important indicator that can measure the continuous level and comprehensive ability of a safety technology, as well as the degree of modernization of related science and technology capabilities, especially in aviation, biology, medical and other high-tech cultural industries, and it is also a powerful indicator. reflect. So, what errors may occur during CNC machining and CNC machining? Let us understand together:   The use of approximate machining motion or approximate tool contours causes errors in the CNC principle of machining. The reason why it is called machining principle error is because of the error in machining


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What are the rules for metal stamping die scrap tube?

The Purpose Standardize the management of the scrapping of the company's metal stamping dies, prevent the loss of company assets, and formulate this system specially. Scope of application It is suitable for the management of the company's scrap molds. Definition If the molds listed in the assets of the company fall under one of the following circumstances, the use management department may apply for scrapping. 1. Molds that exceed the specified service life. 2. The mold is severely damaged by accidents or accidents, and molds that cannot be repaired or have no repair value. 3. Metal stamping dies that have not reached the service life, but due to safety, quality, efficiency and other issues, the repair still fails to meet the minimum requirements of the customer's product process or affects the production safety and efficiency. 4. Product customers have stopped placing orders or have not placed orders for molds in several years. 4. Responsibilities 1. Responsibilities of th

Measures to reduce NO and particulate emissions at the same time become internal combustion engine research


In order to meet increasingly stringent emission regulations, especially the restrictions on diesel engine particulate and NO emissions, seeking measures that can simultaneously reduce NO and particulate emissions has become an important topic in internal combustion engine research. For diesel engines, it is usually used to delay fuel injection, increase fuel injection rate, high pressure injection, common rail injection system, pilot injection, multiple injection, premixed compression ignition, EGR (exhaust gas recirculation) and exhaust gas aftertreatment technology to reduce NO and particulate emissions. It is an effective way for diesel engines to use alternative fuels to reduce particulate and NO emissions. The application of alcohol fuels (such as methanol, ethanol) to diesel engines can significantly reduce NO and particulate emissions. *New research has found that dimethyl ether is a more suitable alternative fuel for diesel engines. The test results of AMOCO and Hal-Dimethyl ether on a variety of diesel engines show that dimethyl ether can achieve engine high efficiency, ultra-low emissions, soft and smokeless combustion, and can meet the most stringent European III and California Of ultra-low emission vehicles. The performance and combustion characteristics of the engine fueled with dimethyl ether are studied, and the influence of the main parameters of the combustion system on the engine performance is studied.

Fuel characteristics (1) Dimethyl ether is the simplest ether compound with molecular formula 3. The main physical and chemical properties of dimethyl ether and diesel are compared. There are only CH and CO bonds in the molecular structure of dimethyl ether, and no CC bonds. In addition, it is an oxygen-containing fuel, which helps to reduce the smoke and particles generated by combustion; at the same time, it can use a greater exhaust gas recirculation rate (EGR) , To reduce NO emissions. (2) The low calorific value of dimethyl ether is only 64.7% of diesel. In order to achieve the power of diesel engine, the circulating fuel supply of dimethyl ether must be increased. (3) The cetane number of dimethyl ether is higher than that of diesel and much higher than other alternative fuels. Therefore, it is not necessary to take combustion-supporting measures when using dimethyl ether in diesel engines. (4) The saturated vapor pressure of dimethyl ether at normal temperature and pressure is 0.5MPa. As the temperature increases, its saturated vapor pressure increases. In order to prevent the occurrence of air lock phenomenon, the pressure of the fuel supply system is much higher than that of the diesel fuel supply system. 2% castor oil is added to dimethyl ether to increase the lubricity of the fuel, but pure dimethyl ether is used in the emission test to eliminate the influence of lubricants on emissions.

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