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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

Classification of CNC Machining Occupation Levels

1. Blue-collar layer:   That is, CNC machining operation technicians, proficient in machining and CNC machining process knowledge, proficient in the operation and manual programming of CNC machine tools (attributes: automated machine tools), understand automatic programming and simple maintenance of CNC machine tools (attributes: automated machine tools), such There is a large market demand for personnel, and they are suitable for operating workers of CNC machine tools (attributes: automated machine tools) in the workshop, but due to their single knowledge, their wages will not be much higher.   2. Gray collar layer:   One, CNC machining programmer:   Master the knowledge of 5 Axis CNC machining Aluminum   technology and the operation of CNC machine tools (attributes: automated machine tools), be familiar with the design and manufacturing expertise of complex molds (title: mother of industry), and be proficient in 3D CAD/CAM software, such as UG, GOOGLE PRO/E, etc. ; Familiar with CNC

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

Important measures to improve the performance of LPG public bus engines

 

The current layout of the radiator, fan and partition in the air intake compartment in the engine compartment is unreasonable. For example, there is a vortex in front of the radiator. L1 is not fully utilized, and the actual flow to the engine working area is very small, and the flow velocity is very low, resulting in poor convective heat transfer efficiency and poor heat dissipation in the engine compartment. In the improvement plan of the engine compartment layout, consider changing the orientation of components such as radiators and fans, changing the fan to face the engine body instead of the rear door, and removing the partition of the air inlet compartment in Zone A, which can effectively The high-speed air flow from the fan is used to improve the efficiency of convection heat transfer in the cabin and improve the heat dissipation performance of the cabin.

Using CFD and engineering heat transfer numerical analysis methods, the air flow vector diagram and the temperature distribution cloud map in the flow field in the engine compartment of a certain type of LPG gas bus are obtained, and the main high-temperature components in the engine compartment are analyzed based on the radiator. , Intercooler, engine block, turbocharger, etc., their heat is transferred to the outside of the engine compartment by the convection of air. The layout of various components in the engine compartment, especially the positions of various partitions and fans in the compartment, is one of the key factors that cause the heat dissipation characteristics of the engine compartment. Therefore, the engine compartment design based on automobile air heat transfer dynamics is one of the important measures to improve the performance of the LPG public bus engine.

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