With the development of abrasive belt grinding over the past 30 years, it has become a new processing technology which is more complete and self-contained. Because of its high processing efficiency, wide application scope, strong adaptability, low cost, safe and convenient operation, and so on by the user Pro-gaze. In foreign countries, abrasive belt grinding technology has been a great progress, its processing objects and applications are becoming more and more extensive, it can almost process all engineering materials, from ordinary daily life appliances to large aerospace appliances, and has become an important means of obtaining significant economic benefits. As a kind of processing technology, it has been paid more and more attention and has been developed rapidly because it has some of the following important characteristics:
I. Grinding performance
Abrasive belt grinding is a kind of elastic grinding, which is a composite machining process with various functions of grinding, grinding and polishing.
Abrasive grains of abrasive belts
Abrasive grains in abrasive belts have stronger cutting ability than grinding wheels, so the grinding efficiency is very high. Abrasive belt grinding efficiency is high in its excision rate, grinding ratio (cutting workpiece weight and abrasive wear weight ratio) and machine tool power utilization three. At present, the sand cutting rate of steel strip grinding is known to reach 700mm3/mm s, even exceeding turning or milling. The abrasive belt is much more grinding than the grinding wheel, up to 300:1 or even 400:1, while the grinding wheel is only 30:1. Abrasive Belt Grinder Power utilization, far in the early development of abrasive belt grinding has reached 80%, ahead of other machine tools, and now up to 96%, by contrast, grinding wheel grinder only 52%, milling 57%, lathe 65%, so abrasive belt grinding is a good energy-saving processing technology.
III. Cold-State grinding
Abrasive belt grinding workpiece surface quality is high. Apart from the multiple effects of grinding, grinding and polishing, it is also because the abrasive belt grinding has "cold grinding" in the case of grinding, i.e., the grinding temperature is low, the workpiece surface is not prone to burn.
IV. Grinding Vibration
The abrasive belt grinding system vibrates small and stable. Because the abrasive belt itself is light quality, its grinding process structure system's equilibrium state is easy to control, all rotating parts (such as contact wheels, drive wheels, tensioning wheels, etc.) wear minimal, will not be the phenomenon of grinding wheel such as dynamic imbalance factors.
In addition, the elastic grinding effect of the abrasive belts can greatly reduce or absorb the vibrations and shocks that occur during grinding. The grinding speed is stable, and the belt drive wheel is not as grinding as the grinding wheel, the smaller the diameter is slower.
The high surface quality of abrasive belt grinding workpiece is mainly manifested in small surface roughness, good residual stress state and no microscopic cracks or microstructure changes. From the surface roughness, abrasive belt grinding is now up to Ra0.01mm, reaching the effect of specular grinding, and for the roughness value in Ra0.1mm above, it is very easy to achieve. The surface residual stresses of abrasive belt grinding workpiece are compressive stress state, and its value is generally in -60~-5Kg/mm ², and Grinding Wheel is more tensile force, so the abrasive belt grinding is advantageous to strengthen the workpiece surface and improve the fatigue strength.
VI. Grinding Precision
Abrasive belt grinding precision is high. Because of the production quality of abrasive belt and the improvement of abrasive belt grinder, abrasive belt grinding has crossed the ranks of precision and ultra-precision machining, and the highest precision has reached below 0.1mm.
VII. Grinding costs
Abrasive belt grinding cost is low. This is mainly manifested in:
Abrasive belt grinding equipment is simple. Compared with grinding wheel grinder, abrasive belt grinder is much simpler, this is mainly because of the light belt quality, the grinding force is small, the vibration is small in the grinding process, the rigidity and the strength requirement of the machine tool are far below the grinding wheel grinder.
Abrasive belt grinding is easy to operate and less auxiliary time. Whether it is manual or motorized abrasive belt grinding, its operation is very simple. It can be accomplished in a short time from replacing the adjusting sand belt to the clamping of the machined workpiece.
The abrasive belt grinding ratio is large, the machine tool power utilization is high, the cutting efficiency is high. This reduces the cost of tools and energy consumed by the removal of the same weight or volume of materials, and takes less time.
VIII. Grinding SAFETY
Abrasive belt grinding is very safe, noise and dust are small, and easy to control, environmental benefit is good.
Because the belt itself is very light quality, even if the fracture will not hurt people risk. Abrasive belt grinding is not as serious as the grinding wheel, especially dry grinding, debris composition is mainly processed materials, it is easy to recycle and control dust. Due to the use of rubber contact wheels, abrasive belt grinding does not form the grinding wheel as the rigid impact of the workpiece, so the processing noise is very small, usually <70dB. Therefore, from the environmental protection point of view abrasive belt grinding is also very worthy of promotion.