What are the methods to remove burrs in processing machinery?
Nowadays, with the increasing emphasis on deburring in various industries, although burrs are not a big thing in CNC precision parts machining, they directly affect the quality of products. Therefore, deburring methods are constantly emerging. Electrolytic deburring is suitable for removing burrs from hidden cross holes or complex shaped parts in parts, with high production efficiency. The deburring time generally only takes a few seconds to tens of seconds. This method is commonly used for deburring gears, splines, connecting rods, valve bodies, and crankshaft oil passage holes, as well as rounding sharp corners. The disadvantage is that the vicinity of burrs on the parts is also subjected to electrolytic action, causing the surface to lose its original luster and even affecting dimensional accuracy.
There are several commonly used trimming/deburring methods nowadays:
1. The traditional way to manually remove burrs is to use steel files, sandpaper, and grinding heads; And edge trimming knives have gradually replaced these traditional methods, making them simple and convenient to use, requiring no technical processing, saving costs, and being environmentally friendly.
2. Chemical deburring. Using the principle of electrochemical reaction, deburring operations are automatically and selectively performed on parts made of metal materials. It can be widely used for deburring parts such as pump bodies, valve bodies, connecting rods, plunger needle valves, and other components made of different metal materials in industries such as pneumatic, hydraulic, engineering machinery, oil nozzle pumps, automobiles, and engines. Suitable for parts with internal burrs that are difficult to remove, heat-treated, and precision machined.
3. Electrolytic deburring is an electrochemical 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 burrs on the workpiece, with a certain gap (usually 0.3-1 mm) between them. The conductive part of the tool cathode is aligned with the edge of the burr, and the other surface is covered with an insulation layer to concentrate the electrolytic action on the burr. During processing, the cathode of the tool 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 0.1-0.3 megapascals flows between the workpiece and the cathode. After connecting to the DC power supply, burrs are removed by anodic dissolution and carried away by the electrolyte. The electrolyte has a certain degree of corrosiveness, and the workpiece should be cleaned and rust proofed after deburring.
