An ultrasonic grinding machine, also known as an ultrasonic assisted grinding machine, is a grinding machine that is combined with computerized technology and the technique of ultrasonic machining, which especially helps the machine perform the grinding works on the hard and brittle materials.
The ultrasonic grinding machine makes the workpieces that are ground with the finest surfaces and prolongs the lifespan of the machine tools, which are the grinding wheels and the machine itself in against any difficult circumstance. The invention of this technology makes the grinding machine more advanced and enables the machine to achieve a wider range of machining results on the products.
A grinding machine is a machine that is specialized in the refining of the workpieces before they become the final products, which can be regarded to be in the field of secondary machining processes. When the grinding machine is in operation, there would be the grinding wheels, which are the tools on the machine, to perform the grinding work on the workpieces by the abrasive grains on the wheels.
The operation principle of a grinding machine is similar to others like a milling machine, for example, which is to form the workpieces depending on the required geometries of the products. While the grinding machine is more likely to conduct the final procedure in the formation of the products. As the abrasive grains grind on the drilled holes or milled slots, the burrs on these parts can be removed, and thus results in the smoothness of the surfaces.
However, when it is necessary to grind on the materials that are extremely hard or easy to fracture, providing too much pressure on these materials may lead to the breakage of the workpieces, or in more serious cases, the machine tools would break as well. Therefore, grinding on these materials becomes a difficult task for the conventional grinding machine.
In order to deal with this problem for the grinding machine, adopting the ultrasonic technology is a wise choice. With an ultrasonic grinding machine, no matter the change in temperature, pressure, or the material properties, this innovative technology is capable of handling these challenges that the conventional grinding machine may face.
The construction of an ultrasonic grinding machine is not much different from the traditional grinding machine, except for the direct grinding area, which includes an ultrasonic spindle, an ultrasonic horn, a grinding wheel, and a dynamometer.
● Ultrasonic spindle
The ultrasonic spindle is in charge of driving the grinding wheel with rotary motion during the operation. The spindle on this type of grinding machine provides an extremely high rotation speed, which can be maximized up to 24000RPM, in order to enhance the efficiency of the grinding work.
● Ultrasonic horn
The ultrasonic horn, which is arranged above the grinding wheel, provides a vibrating force for the rotary grinding wheel when it comes in contact with the workpiece, which helps reduce the cutting stress by 30% to 70%, and thus allow this machine to achieve the grinding work on relatively hard and brittle materials.
● Grinding wheel
The grinding wheel is made of abrasive grains that are arranged with the bond. It is driven by the ultrasonic spindle to perform the rotary motion, and receive the vibrating force from the ultrasonic horn, so as to be strengthened during the grinding process.
The dynamometer on the ultrasonic grinding machine is used to measure the torque and power of the machine tools, which is the grinding wheel, when it receives the forces from the ultrasonic spindle and the horn, in order to control the grinding process and ensure the optimal performance of the machine as well as the results on the products.
● Enhancing versatility
As far as we know, the ultrasonic type of grinding machine facilitates a more advanced form of the grinding work with the assistance of the ultrasonic technology, which enables harder and brittle materials to be ground. In other words, the more kinds of materials that are available for being ground, the more versatile the machine can be.
● Improving surface quality
Since the vibrating force that is given from the ultrasonic horn can help reduce the cutting stress of the grinding wheel, the possibility of the production of burrs or edge clipping with stress can be reduced as well, which improve the surface quality of the products accordingly.
● Prolonging tool life
With the development of the versatility of the grinding machine, the wear on the tools can be prevented, which means the tools are strengthened and able to withstand heavier loads than the tools on the conventional machines. In other words, the lifespan of the grinding wheels on this type of grinding machine can be prolonged without easily wearing.
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