Conventional machining methods deburring
Burr this little thing was not much, but it is a direct impact on product quality. So in recent years, with the industry's attention to deburring, deburring methods are endless. Now commonly used trimming / deburring there are so few:
1. Manual deburring traditional way is steel file, sandpaper, grinding polishing; and trimming knife gradually replaced these traditional methods, easy to use, does not require technical processing, cost savings and environmental protection.
2. Chemical deburring. Electrochemical reaction principle, the
metal material parts automatically and selectively complete deburring job. It can be widely used for deburring pneumatic, hydraulic, mechanical engineering, pump nozzle, cars, engines and other metal materials in different industries pump, valve, connecting rod, piston and other parts of the needle Couples. Suitable for difficult to remove internal burrs, heat treatment and finishing parts.
3. The use of electrolytic deburring electrolysis An electrolytic machining method of removing the metal burr, the English abbreviation ECD. The tool of the cathode (usually brass) have a fixed place in the vicinity of the work site burr, both located a gap (generally 0.3 to 1 mm). Tool of the cathode conductive portion aligned with burr edge, covering up other surfaces with an insulating layer, so that electrolysis concentrated in burr section. Machining tool cathode to the negative DC power supply, the workpiece then positive DC power supply. A pressure of 0.1 to 0.3 MPa low pressure electrolyte solution (typically an aqueous solution of sodium chlorate or sodium nitrate) flowing between the workpiece and the cathode. When connected to a DC power supply, will produce burrs are removed by anodic dissolution, was taken away by the electrolyte. There are certain corrosive electrolyte, the workpiece should be cleaned deburring and rust treatment. Electrolytic deburring suitable for removing parts of the hidden parts of the cross-hole burrs or shape complex parts, high production efficiency, deburring time is usually just a few seconds to tens of seconds. This method is commonly used in gears, splines, connecting rod, crankshaft and valve orifice oil deburring, etc., as well as rounded corners and so on. The disadvantage is near the burr also been electrolysis, the surface will lose their luster, and even affect the dimensional accuracy.
4. When the ultrasonic energy ultrasonic deburring ultrasonic vibrations generated in the liquid in the liquid in the sparse state will be torn into small hole (that is, the interior is a vacuum) of these holes in the rupture time will produce up to several hundred atm instantaneous pressure, a phenomenon known as cavitation both. Ultrasonic deburring is to use an instant impact "cavitation" generated hundreds of atmospheric pressure to adhere to the member burrs removed. Ultrasonic deburring all burrs are not applicable, mainly for some of the microscopic burrs, generally if burrs need a microscope to observe, then you can try to remove by ultrasonic method. For visible glitches, mainly to see the strength of the bond, the bond strength is weak glitches can use an ultrasound, if the general burrs with a cutter to process, with the ultrasonic method is simply not acceptable. Advantages and disadvantages of ultrasonic deburring.
5. The high-pressure water jet deburring the name suggests is based on water as a medium, using its instant impact force to remove the burr and flash generated after processing side, and can achieve the goal of cleaning. After several tests test, to find a suitable final pressure of 30MPa-50MPa. If the pressure is insufficient to achieve the deburring effect, although the pressure is too high can remove the burr, but the risk of damage to the workpiece exists. Typically when using a hydraulic fluid pressure to bear are less than 20Mpa, with 50MPa pressure can not be destroyed burr residues at several MPa working pressure off the chances are very small to be considered the root of burr the residue is the portion of the workpiece. Now high pressure water deburring equipment manufacturers more and more simple can be summarized into two categories: the workpiece and the nozzle mobile mobile. Workpiece mobile low cost, simple body suitable for deburring and cleaning, the drawback is in line with the degree of the nozzle and the valve body is not satisfactory, the body internal cross hole deburring, removing ineffective slant holes; nozzle mobile via CNC control can effectively adjust the distance between the nozzle and the valve glitch parts of the body corresponding to an effective internal cross burr holes and slant-hole and blind hole, but because of the high cost of this equipment, so far only the heart of the automobile and construction machinery hydraulic control system in order to enjoy this universal favor.
6. Thermal deburring explosion, also known as electric deburring school, it is easy to by some of the natural gas into the furnace to a device, and then by the action of some of the media and conditions, so that the gas explosion instantly, using the energy generated by explosion to dissolve and remove burrs. Explosion method is mainly used in some of the areas of high-precision parts, precision parts such as automotive and aerospace. The process for a number of glitches in which the remote site, the traditional process of product comparison suffering, there is relatively good, which itself has a certain technical requirements, having kept the mechanical properties of the original product benefits, but there are some limitations. First, productivity is generally low. Because the process is more stringent requirements under the environment in which explosive devices, the number can handle large quantities of relatively limited. Second, the high cost of treatment. Buy a explosion deburring equipment, generally require millions. Many SMEs simply can not afford to bear such costs. Third, easily lead to rust. Products in the high-temperature blast furnace, very easily lead to rust. Fourth, the workpiece deformation. Fifth, there are certain technical requirements for the operation, not ordinary people easy to operate.
7. Frozen Deburring, rubber, plastic products, zinc, magnesium alloy products, such as flash (or burr) is thicker than the thickness of the product is much thinner, so the flash (or burr) embrittlement faster than products embrittlement speed in flash (or burr) embrittlement article no embrittlement this time period, frozen deburring (trimming) machines to hit products by projectile projectile, thus removing burrs in embrittlement ( or burrs). Frozen Deburring (trimming) machines, is a use of liquid nitrogen cryogenic rubber, plastic products, fly zinc magnesium alloy rim embrittlement occurs rapidly, and in this state, the high-speed particle impact ejected frozen products burr (or flash), so as to achieve both high quality and high efficiency removal of burrs article (or flash), while maintaining special deburring (trimming) all the preparation itself does not change the physical properties of the device. It can greatly improve the product trimming (deburring) precision and a high degree of intensification. Currently such devices has become a precision rubber products, die-casting business indispensable, after trimming and deburring processing equipment.
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