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The CNC Machine Tool Manufacturer will introduce you the following principles of wire cutting:
In the middle MS-WEDM process, a thin oxide film is formed near the anode of the workpiece, which can isolate the anode from the electrolyte of the workpiece. The oxide film has a higher resistance and smaller electrical conductivity, which can prevent the surface of the anode of the workpiece from further dissolving, and has a certain protective effect on the anode of the workpiece. Under the rapid scouring of the electrolyte, the oxide film on the depression of the anode surface of the workpiece is thicker because it is not easy to diffuse; the oxide film on the protrusions of the anode surface of the workpiece (such as burrs, microscopic protrusions, etc.) is thinner because of easy diffusion. Due to the uneven distribution of the oxide film, protruding parts such as burrs are always in contact with the fresh electrolyte, so the metal dissolution rate of the burrs is much faster than other parts of the anode surface so that the burrs are quickly dissolved and removed.
In summary, due to the uneven distribution of the oxide film, the oxide film on protruding parts such as the burr on the anode surface of the workpiece is thin and can always be in contact with the fresh electrolyte, so the electrochemical reaction speed is fast; due to the uneven distribution of power lines, the anode surface of the workpiece Bursts and other protruding parts of the power line are densely distributed, the current density is large, and the erosion speed is fast. Therefore, the pulse electrochemical deburring process can achieve the purpose of quickly removing, dissolving burrs and forming smooth fillets. By properly adapting the tool cathode shielding technology, burrs can be selectively removed without affecting the original dimensional accuracy and surface quality of the anode surface of the workpiece.
Medium Speed Wire-Cutting
Key points of pulse electrochemical deburring process: There are many process factors that affect the effect of pulse electrochemical deburring, such as the reasonable design of the tool cathode, the selection of the pulse power source, the composition, concentration, pressure and flow rate of the electrolyte, the gap between the electrodes, Current density, processing time, flow field characteristics, etc. The tool cathode should be reasonably designed according to the specific burr situation. Care should be taken to apply shielding technology in the design to ensure that the original accuracy and surface quality of other non-burr parts on the anode surface of the workpiece are protected while the burr is efficiently removed. In addition, the basic principle of pulse electrochemical machining should be satisfied, and even if the electrolyte quickly and uniformly flushes the processed part, the flow field distribution should be uniform and reasonable. Since the surface quality of the electrode directly affects the surface quality of the deburred part, the cathode surface of the tool is required to be flat and smooth. Theoretical research and machining practice show that using pulse power instead of DC power for deburring can effectively improve the machining accuracy and surface quality.
In CNC Linear Cutting Machines For Sale processing, generally narrower pulse width and higher pulse frequency are used for processing. Due to the gap effect and step change of the pulse current, the electrolyte in the machining gap oscillates and generates a pressure wave. The stirring effect of the pressure wave can improve the flow conditions of the electrolyte in the machining gap, accelerate the update of the electrolyte in the gap, and eliminate The non-uniformity of the conductivity distribution of the electrolyte in the processing gap, thereby improving the processing accuracy and improving the surface roughness. In addition, due to the periodic update of the electrolyte, the electrochemical products (metals removed from the anode, hydrogen precipitated from the cathode, Joule heat generated, etc.) can be removed in a timely and sufficient manner. The parameters of the pulse power supply should be reasonably selected according to the processing conditions.