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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

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

High-pressure governing valve and low-pressure governing valve to control the thermal and electrical load of the unit

Less equipment to be operated and simple operation When the Austrian 12MW unit is in normal operation, the main oil pump outlet oil pipeline supplies oil to the lubrication and regulation system respectively. During the start and stop phases of the unit, the outlet oil pipeline of the AC oil pump supplies oil to the lubrication and speed control systems respectively. In the cranking state of the turbine, by pressing the mechanical handle of the manual brake and stop on the side of the machine head, the oil supply to the turbine speed control system is cut off, and the AC oil pump only supplies oil to the lubricating oil system and the cranking device. When the domestic 12MW unit is operating normally, the outlet pipe of the main oil pump supplies oil to the No. 1 and No. 2 injectors and the speed control system respectively, the No. 1 injector supplies oil to the main oil pump inlet, and the No. 2 injector supplies the turbine lubricating oil system. Fuel supply. During the start and stop stages of the unit, the high-pressure start oil pump supplies oil to the turbine speed control system and lubricating oil system. In the cranking state of the turbine, the high-pressure start oil pump should be stopped, and the AC lubricating oil pump should be started to supply oil to the lubricating oil system and the cranking device. There are fewer oil pipelines to be installed and the system layout is relatively simple. On the outlet oil pipe of the main oil pump of the Austrian 12MW steam turbine, the system is divided into a power oil pipe and a lubricating oil pipe through a 517 orifice plate. The power oil is controlled by the oil pressure to switch the high-pressure speed regulating valve and the low-pressure regulating valve respectively to control the thermal and electrical load of the unit.

The oil pipeline of the domestically made 12MW steam turbine governor system is divided into pressure oil, primary pulsation oil, secondary pulsation oil, etc. Under the action of the primary pulsating oil pressure and the secondary pulsating oil pressure, the pressure oil switches the high-pressure speed regulating valve and the low-pressure rotating baffle respectively to control the thermal and electrical load of the unit. The main oil pump of the 12MW steam turbine produced in Austria is a self-priming high-pressure oil pump, and the AC oil pump is a high-pressure screw pump with high output. Since the main oil pump is a self-priming oil pump, no other auxiliary equipment is needed to supply oil to its inlet, and the output of the main oil pump and AC oil pump are relatively large, which can meet the needs of unit operation. The main oil pumps of domestic 12MW steam turbines are mostly radial centrifugal pumps. In order to ensure the normal operation of the inlet oil pressure, an injector is generally designed to supply oil to its inlet.

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