Common methods of deburring
Although the burr is not big, it directly affects the quality of the product. Therefore, with the emphasis on burr removal in various industries, there are endless methods of deburring. Commonly used trimming / deburring are mainly as follows:
traditional; and the trimming knife gradually replaces these traditional methods, does not require technical processing, saves costs and is environmentally friendly.
Using the principle of electrochemical reaction, the parts made of metal materials can be automatically and selectively deburred. It can be widely used in the deburring processing of pump bodies, valve bodies, connecting rods, plunger needle valve couplers and other parts of different metal materials in pneumatic, hydraulic, engineering machinery, nozzle oil pumps, automobiles, engines and other industries. Ideal for hard-to-remove internal burrs, heat-treated and finished parts.
An electrolytic machining method that uses electrolysis to remove burrs from metal parts, abbreviated as ECD in English. Fix the tool cathode (usually made of brass) near the burr part of the workpiece, with a certain gap (usually 0.3 to 1 mm) between the two. The conductive part of the tool cathode is aligned with the edge of the burr, and the other surfaces are covered with an insulating layer, so that the electrolysis is concentrated on the burr part. During processing, the tool cathode is connected to the negative pole of the DC power supply, and the workpiece is connected to the positive pole of the DC power supply. A low-pressure electrolyte (usually sodium nitrate or sodium chlorate aqueous solution) with a pressure of 0.1 to 0.3 MPa flows between the workpiece and the cathode. When the DC power supply is turned on, the burr will be removed by anode dissolution and taken away by the electrolyte. The electrolyte is corrosive to a certain extent, and the workpiece should be cleaned and rust-proofed after deburring. Electrolytic deburring is suitable for removing burrs in hidden parts of intersecting holes or parts with complex shapes, with high production efficiency, and the deburring time is generally only a few seconds to tens of seconds. This method is often used for deburring of gears, splines, connecting rods, valve bodies and crankshaft oil passage holes, etc., as well as for rounding sharp corners. The disadvantage is that the vicinity of the burr of the parts is also subjected to electrolysis, the surface will lose its original luster, and even affect the dimensional accuracy.
When the ultrasonic energy generated by the ultrasonic wave acts on the liquid in a sparse state of vibration, it will be torn into small cavities (that is, the interior is vacuum). , and this phenomenon is called cavitation. Ultrasonic deburring is to use the instantaneous impact force of hundreds of atmospheres generated by the "cavitation phenomenon" to remove the burrs attached to the components. Ultrasonic deburring is not suitable for all burrs, mainly for some microscopic burrs. Generally, if the burrs need to be observed with a microscope, you can try to remove them with ultrasonic waves. For the burrs visible to the naked eye, it mainly depends on the strength of the bond. The burrs with weak bond strength can be treated with ultrasonic waves. Generally, the burrs that can only be treated with a tool can not be treated with the ultrasonic method. Advantages and disadvantages of ultrasonic deburring.
high pressure water jet
As the name implies, it uses water as the medium, and uses its instantaneous impact force to remove the burrs and flashes generated after processing, and at the same time, it can achieve the purpose of cleaning. After many tests and tests, the suitable pressure is found to be 30MPa-50MPa. If the pressure is insufficient, the effect of deburring cannot be achieved. Although the pressure is too high, the burr can be removed, but there is a danger of damaging the workpiece. Usually, the hydraulic pressure of hydraulic parts in use is within 20Mpa, and the burr residue that cannot be removed by the pressure of 50MPa, the probability of falling off under the working pressure of several MPa is very small, and it can also be considered that the root of the burr remains. Residues are part of the workpiece. There are more and more manufacturers of high-pressure water deburring equipment, which can be simply classified into two categories: workpiece mobile and nozzle mobile. The movable workpiece type has low cost and is suitable for deburring and cleaning of simple valve bodies. The disadvantage is that the cooperation between the nozzle and the valve body is not ideal, and the burr removal effect of the cross holes and inclined holes in the valve body is not good; the mobile nozzle type is controlled by CNC. It can effectively adjust the distance between the nozzle and the burr-generating part of the valve body, and effectively correspond to the cross holes, inclined holes and blind holes inside the valve body. However, due to the high cost of this equipment, only the heart of the car and the hydraulic control system of construction machinery to enjoy this favor in general.
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