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Working principle of slow wire processing

 Slow wire walking, also called low-speed wire walking, is a kind of CNC machining machine tool that uses continuously moving fine metal wire as an electrode to pulse spark discharge on the workpiece to generate a high temperature of over 6000 degrees, ablate metal and cut into a workpiece. The principle of wire processing is the phenomenon that there is a gap between the wire electrode and the workpiece, and the metal is removed by continuous discharge. Since the slow-moving wire cutting machine adopts the method of wire electrode continuous feeding, that is, the wire electrode is processed during the movement, so even if the wire electrode is worn out, it can be continuously supplemented, so it can improve the machining accuracy of the parts and slow the wire. The surface roughness of the workpiece processed by the cutting machine can usually reach Ra=0.8μm and above, and the roundness error, linear error and dimensional error of the slow-moving wire cutting machine are much better t

Hydrostatic guideway of CNC machining lathe

The static pressure slide rail (TTW guide) of the CNC machining lathe transfers the oil with a certain pressure through the throttle to the oil cavity between the sliding surfaces of the slide rail (TTW guide) to form a pressure oil film to float the moving parts , Make the sliding rail (TTW guide) surface in a pure liquid friction state.   CNC machining General CNC machining usually refers to computer digital control precision machining, CNC machining lathe, CNC machining milling machine, CNC machining c17200   beryllium   copper   and milling machine, etc. The feed route of finishing is basically carried out along the part contour sequence. Therefore, the focus of determining the feed route is to determine the feed route of rough machining and idle stroke. In the numerical control processing, the control system issues instructions to make the tool perform various motions that meet the requirements, and the shape and size of the workpiece are expressed in the form of numbers and lette

Elimination of Gear Backlash in CNC Machining Feed System

Elimination of Gear Backlash in CNC Machining Feed System   The transmission gear in the feed system of the CNC machining machine tool must eliminate the transmission gap between the meshing gears as much as possible, otherwise the motion will lag behind the command signal after each reversal of the feed system, which will affect the machining accuracy (accuracy) ). There are the following two common methods for CNC machining machine tools to eliminate the transmission gear gap.   1. Rigidity adjustment method   The rigid adjustment method is an adjustment method that cannot be automatically compensated for the tooth side clearance after adjustment. Therefore, the pitch tolerance and tooth thickness of the gear must be strictly controlled, otherwise the flexibility of the transmission will be affected. This adjustment method has a relatively simple structure and a better transmission rigidity.   (1) Eccentric shaft adjustment method   As shown in Figure 610, the gear 1 is mounted on 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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