Deburring the most commonly used methods
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Trimming, deburring the common methods
Burr is a small thing although not big, but it is directly affect the quality of the product. Therefore, in recent years, with the importance of various industries on the removal of burrs, deburring methods are also endless. Now commonly used trimming / deburring there are several:
1. manual deburring The traditional way is a steel file, sandpaper, abrasive grinding; and trimming knife gradually replaced these traditional methods, easy to use, do not need technical processing, cost savings and environmental protection.
2. Chemical deburring. With the principle of electrochemical reaction, made of metal material parts automatically, selectively complete deburring operations. It can be widely used in pneumatic, hydraulic, construction machinery, nozzle oil pumps, automobiles, engines and other industries of different metal materials, pump body, valve body, connecting rods, plungers, needle valves and other parts of the parts of the deburring process. Suitable for difficult to remove the internal burrs, heat treatment and finishing parts.
3. Electrolytic deburring The use of electrolysis to remove burrs on metal parts of a method of electrolytic processing, referred to in English as ECD. The cathode of the tool (generally brass) is fixed in the workpiece burrs near the part, the two are separated by a certain gap (generally 0.3 ~ 1 mm). 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 in the part of 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. Pressure of 0.1 ~ 0.3 MPa of low-pressure electrolyte (generally with sodium nitrate or sodium chlorate aqueous solution) flowing through the workpiece and cathode between. When connected to the DC power supply, the burr will produce anodic dissolution and be removed, be taken away by the electrolyte. Electrolytic solution has a certain degree of corrosiveness, the workpiece should be cleaned and rust treatment after deburring. Electrolytic deburring is suitable for removing hidden parts in the parts of the cross-hole or the shape of the complex parts of the burr, high production efficiency, deburring time is generally only a few seconds to tens of seconds. This method is commonly used in gears, splines, connecting rods, valve body and crankshaft oil orifice deburring, as well as chamfering sharp corners. The disadvantage is that the parts of the burr near the electrolytic effect, the surface will lose its original luster, and even affect the dimensional accuracy
4. Ultrasonic deburring Ultrasonic ultrasonic energy generated by the liquid vibration in the liquid is in a dilute state of the liquid, it will be torn into very small cavities (i.e., the internal is a vacuum) These cavities in the rupture of the moment when it will produce up to several hundred atmospheres of pressure, and this phenomenon is known as cavitation. This phenomenon is called cavitation. Ultrasonic deburring is the use of "cavitation phenomenon" generated by hundreds of atmospheric pressure of the instantaneous impact of the attached parts to remove the burr clean. Ultrasonic deburring is not applicable to all burrs, mainly for some microscopic burrs, generally if the burr needs to be observed with a microscope, then you can try to remove the ultrasonic method. For burrs visible to the naked eye, mainly depends on the bonding strength, bonding strength of weak burrs can be used ultrasonic, generally if the burrs can be processed with a knife, ultrasonic method is not at all. Advantages and disadvantages of ultrasonic deburring
5. High-pressure water jet deburring As the name suggests, it is water as a medium, the use of its instantaneous impact to remove the burrs and fringes generated by the processing, and at the same time, can achieve the purpose of cleaning. After many experiments and tests, we finally found a suitable pressure of 30MPa-50MPa. If the pressure is not enough, can not achieve the effect of deburring, although the pressure is too high can remove burrs, but there is a risk of damage to the workpiece. Usually hydraulic parts in the use of the liquid pressure are within 20Mpa, with 50MPa pressure can not be knocked out of the burr residue, in a few megapascals of working pressure under the chances of shedding is very small, you can also think that the root of the burr residue is a part of the workpiece. Now more and more manufacturers of high-pressure water deburring equipment, can be simply summarized into two categories: workpiece mobile and nozzle mobile. Workpiece mobile low cost, suitable for simple valve body deburring and cleaning, the disadvantage is that the nozzle and the valve body of the degree of coordination is not ideal, the valve body of the internal cross-hole, diagonal holes in the burr removal effect is not good; nozzle mobile CNC control can be effectively adjusted through the nozzle and the valve body of the distance between the parts of the burr, effective counterpart of the valve body of the internal cross-hole and the diagonal holes, as well as the blind holes in the burr, but because of the high cost of this equipment, to the But because of the high cost of this equipment, so far only the heart of the car and the hydraulic control system of the construction machinery can generally enjoy this hospitality.
6. thermal explosion deburring, also known as electro-thermal deburring, it is through some of the easy gas, rushed to a device in the furnace, and then through some media and conditions of the role of the gas instantly exploded, the use of the energy generated by the explosion to dissolve to remove the burr. Explosion method is mainly used in some high-precision parts and components in the field, such as automotive and aerospace precision parts. The process for some of the burrs are located in remote areas, the traditional process is more difficult products, there are better applications, which itself has certain technical requirements, with the advantage of maintaining the original mechanical properties of the product, but there are certain limitations . First, the production efficiency is generally lower. As the process requires a more stringent environment, in this explosion equipment, can be processed in large quantities is relatively limited. Second, the cost of processing is high. Purchase an explosion of deburring equipment, generally need millions. Many small and medium-sized enterprises simply can not afford such costs. Third, easy to cause product rust. Products in the high temperature explosion furnace, very easy to lead to rust. Fourth, the workpiece is easy to deform. Fifth, the operation has certain technical requirements, not ordinary people easy to operate.
7. Freezing trimming deburring, rubber, plastic products, zinc-magnesium-aluminum alloys and other products fringe (or burr) thickness than the thickness of the product is much thinner, so fringe (or burr) embrittlement speed than the product embrittlement speed, in the fringe (or burr) embrittlement and products are not brittle in this period of time, freezing deburring (trimming) machine by ejection of projectiles to hit the product to remove the fringe in the embrittlement (or burr). The machine removes the embrittled fringe (or burr) by ejecting a projectile that strikes the product.
Freezing deburring (trimming) machine, is a use of liquid nitrogen's ultra-low temperature so that rubber, plastic products, zinc magnesium aluminum alloy fringe rapid embrittlement, and in this state, through the high-speed injection of frozen particles hit the products of the burr (or fringe), so as to achieve both high-quality, high-efficiency removal of the products of the burrs (or fringes), but also to maintain all the physical properties of the products themselves do not change the special deburring (trimming) machine. The special deburring (trimming) equipment. It can greatly improve the product trimming (deburring) precision and has a high degree of intensification. At present, this equipment has become a precision rubber and plastic products, die-casting enterprises indispensable after the trimming and deburring equipment.