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Zhang F.L.,Guangdong University of Technology | Yang Z.F.,Guangdong University of Technology | Yang Z.F.,Zhuzhou Cemented Carbide Cutting Tool Co. | Zhou Y.M.,Guangdong University of Technology | And 3 more authors.
International Journal of Refractory Metals and Hard Materials | Year: 2011

A mixture of Ni-Cr-P, Cu and B powder was used as a dilute for modifying the microstructure of the reacted product and easing the fast propagating rate and the high temperature in the self-propagating high-temperature synthesis (SHS) of Ni-Al matrix grinding tool material. The SHS process of the Ni-Al/diamond/dilute was examined and the microstructure of the reacted product was analyzed by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The grinding performance of the tool was tested in the grinding of a synthetic single crystal of sapphire. The results showed that the dilute substantially reduced the propagating rate and the combustion temperature of Ni-Al SHS. Besides the dominating intermetallics NiAl and NiAl3, Ni 4Al3 was also identified in the reacted Ni-Al/diamond/dilute composite owing to the Ni rich environment. In the reacted composite there was a Cr-rich zone at the boundary of the diamond grit due to the formation of Cr3C2 between Cr and the diamond. In the grinding a lower wear rate and a better retention ability of diamond grits could be achieved for the grinding tool material that contained finer diamond grits. © 2011 Elsevier Ltd. All rights reserved. Source


Zeng T.,Zhuzhou Cemented Carbide Cutting Tool Co. | Zhou Z.,Hunan University | Tang A.,Zhuzhou Cemented Carbide Cutting Tool Co. | Xiao S.,Zhuzhou Cemented Carbide Cutting Tool Co. | Zuo X.,Zhuzhou Cemented Carbide Cutting Tool Co.
Zhongguo Jixie Gongcheng/China Mechanical Engineering | Year: 2015

Based on the theory of non-instantaneous center enveloping, a mathematical model of helical groove was established, and the function of grinding parameters and design parameters were deduced. According to the mathematical model, a human-computer interactive interface used to calculate the grinding parameters and simulate the groove section was developed, and then the section profile of the simulative groove and actual groove were compared. The results show a good agreement and verify the validity of the mathematical model. In addition, variations of grinding parameters and groove influenced by design parameters were simply discussed. ©, 2015, China Mechanical Engineering Magazine Office. All right reserved. Source


Tang A.,Hunan University | Tang A.,Zhuzhou Cemented Carbide Cutting Tool Co. | Zhou Z.,Hunan University | Zeng T.,Zhuzhou Cemented Carbide Cutting Tool Co.
Jixie Gongcheng Xuebao/Journal of Mechanical Engineering | Year: 2011

According to the geometry characteristics of helical flutes of the high speed end milling cutter, the general mathematical model of the flute outline in radial section is established. Based on the model and the basic theories of dynamic balance, a mathematical model of mass eccentricity and imbalance value of the high-speed end milling cutter with three unequal blade spaces is deduced. The unbalance value of the end milling cutter is measured by a dynamic balance measuring instrument, and compared with the calculated value. The result shows that the mathematical model of mass eccentricity and imbalance value is completely reliable. According to the model of mass eccentricity, the influencing factors thereof are analyzed and it is found that the helical angle and the length of the cutting edge have the most influence on the mass eccentricity. According to this, the optimal design method for the high-speed end milling cutter with three unequal blade spaces is proposed. In order to investigate the influence of unbalance value and the structure of unequal blade spaces on cutting force and vibration , the comparative tests of high speed milling are carried out. The results show that the structure of unequal blade spaces can suppress vibration and has little influence on cutting force, and the increase of unbalance leads to obvious increase of cutting force and vibration. ©2011 Journal of Mechanical Engineering. Source


Tang A.,Hunan University | Tang A.,Zhuzhou Cemented Carbide Cutting Tool Co. | Zhou Z.,Hunan University | Xiao S.,Hunan University | And 4 more authors.
Zhongguo Jixie Gongcheng/China Mechanical Engineering | Year: 2011

In order to improve the limitation of traditional measurements, and better research of milling vibration, an experiment called fast tool-off milling was designed and carried out. In the experiment, the milling chatter frequency calculated by analysing the machined surface was compared to that calculated from the dynamic torque. The results show that fast tool-off milling experiment can absolutely be applied to investigate the chatter in high speed milling. In addition, the effects of cutting parameters on vibration were studied applying the fast tool-off milling. Source

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