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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

The mechanical efficiency of the motor is equal to the actual output torque of its running state

 

The mechanical efficiency of the motor is equal to the ratio of the actual output torque to the theoretical torque in its operating state. The empirical formula for the mechanical efficiency of the variable motor is as follows: In the above formulas, is the laminar flow leakage coefficient, is the inlet and outlet pressure difference, is the oil dynamic viscosity, is the pump speed, is the motor speed, is the displacement ratio, is the laminar flow resistance coefficient , Is the mechanical resistance coefficient, is a certain torque loss that has nothing to do with the inlet and outlet pressure difference and speed, and is the full displacement of the pump. Obviously, it decreases with the increase of oil viscosity and speed, and increases with the increase of load pressure difference. The total efficiency of the closed hydraulic system increases with the increase of pressure; the total efficiency of the closed hydraulic system increases with the increase of the displacement ratio; with the increase of the displacement of the motor, the driving speed decreases, and the efficiency is obviously improved. The most severe working condition of the full hydraulic motor grader is a high-speed sports car. At this time, the efficiency of the closed system is low, and the system will generate a lot of heat. Whether the cooling system can meet the requirements of the sports car will directly affect the reliability and life of the hydraulic system. Closed system cooling calculation The closed system heat dissipation power loss power caused by the total efficiency of the closed pump and motor is the heat dissipation power required by the closed system.

When the efficiency of the closed system is low when the high-speed sports car is working, the theoretical formula for heat generation is inferred as follows, where is the flow of the system, is the heating power, and the heat balance of the closed system is calculated. The heat of the closed system is mainly fed into the system through the charge pump The cold oil replaces the hot oil and takes away. If the surface heat dissipation of the system components and the pipe loss are not taken into account, the heat absorbed per unit time when the cooling oil added to the system and the hot oil in the system reach a thermal balance is the heat dissipation power of the system. Assuming that the temperature difference between the cold oil added in the system and the hot oil in the system is (unit:), the heat absorbed by the cold oil added per second is the heat dissipation power of the system, namely: where:? Hydraulic oil density, take? The flow rate, the specific heat of the hydraulic oil, the difference between the oil temperature in the closed system and the oil tank temperature is proportional to the working pressure of the system. For a given closed system, its fuel supply and total efficiency are basically unchanged within the normal working range. Therefore, the difference between the oil temperature and the tank temperature in the system mainly depends on the working pressure of the system, that is, the load of the system.

For automotive parts and parts machining, PTJ Shop offers the highest degree of OEM service with a basis of 10+ years experience serving the automotive industry. Our automotive precision shop and experts deliver confidence. We have perfected the art of producing large component volumes with complete JIT reliability, backed by the quality and long-term reliability our customers expect.

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