Abstract
To improve service life of shredder cutters, new technologies such as ultrasonic vibrationassisted cutting and cooling technology (jet and spray) are introduced into the design of the cutter for a two-axis horizontal shredder. Ultrasonic vibration-assisted cutting technology is theoretical analyzed, and result shows that the effect of friction reduction only happens when the speed of cutting is less than vibration speed. Therefore, the vibration-assisted cutting get a friction reduction of 52.5% and a cutting temperature reduction of 10.5% when the vibration-assisted cutting with an amplitude of 25 μm and a frequency of 20 kHz is performed on the shredder with the rotational speed of 60 r/min. Three cooling methods are proposed to lower the temperature of shredder tools such as air jet cooling, water jet cooling, and spray cooling. They are all simulated with Ansys-fluent software on the basis of the Lagrangian model. Simulation results show that water jet cooling can realize better cooling effect, whereas its cooling effect will not improve obviously until the jet diameter increases to around 4 mm. In addition, the cooling effect of the spray with vibration cutting which has less coolant consumption is very close to that of the water jet without vibration cutting. Therefore, the mode of spray cooling with vibration cutting can be used instead of the mode of water jet cooling for higher coolant utilization. By comparing with the traditional cutting of shredder, the spray cooling with vibration cutting has a cutting temperature reduction of 65%.
Highlights
The shredder is known as rolling-cutting shredder which is used to shred wood, rubber, plastics and waste pipes
Qian et al.: Research on Cooling Technology of Shredder Cutting Tool With Ultrasonic Vibration-Assisted Cutting ten years, he drew the conclusion through experiments that vibration cutting can effectively reduce the plastic deformation of chip deformation zone, reduce the friction between tool and chip, and improve service life of tools [2]–[4]
Wen et al used advanced software to analyze the influence of conventional cooling and high-pressure cooling on tool temperature under different cutting modes by AdvantEdge software, the results show that high-pressure cooling can reduce the temperature of the cutting edge of the tool, and reduce the tool wear [14]; T
Summary
The shredder is known as rolling-cutting shredder which is used to shred wood, rubber, plastics and waste pipes. Compared with traditional cutting(TC), VAC have advantages of improving the surface quality of work pieces, reducing cutting temperature and cutting force significantly, and prolonging service life of tools, especially in the processing of brittle materials [1]. P. Qian et al.: Research on Cooling Technology of Shredder Cutting Tool With Ultrasonic Vibration-Assisted Cutting ten years, he drew the conclusion through experiments that vibration cutting can effectively reduce the plastic deformation of chip deformation zone, reduce the friction between tool and chip, and improve service life of tools [2]–[4]. M. Mia et al studied the effect of high pressure cooling with double nozzles on machinability and cutting temperature, the results show that comparing with dry cutting and single nozzle cooling, this method could effectively improve the machinability and the service life of the tool [17], [18]. In order to control the temperature of the shredder cutter effectively, this paper combines ultrasonic vibration cutting with jetting and spraying cooling respectively to analyze the cooling effect of the shredder cutter
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