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Zhang C.,Chongqing University of Arts and Sciences | Zhang C.,Xihua University | Wang Q.,Chengdu Tool Research Institute Co.
Applied Mechanics and Materials | Year: 2013

In this paper, the WC-16TiC-xTaC-9Co and Co are mixed together preparing for WC, (W, Ti, Ta) C. By high-energy ball milling, the powder is cold isostatic pressed and vacuum sintered by 1410°, 1430°and 1450°.The physical properties and the micrographs of samples are detected. The main conclusions are as following: sintered samples have the best comprehensive performance at 1450°, the density of the sample is 99.7% and the actual density is 10.91g/cm3. The hardness is 92.8 HRA and the transverse rupture strength (TRS) is 1100MPa. The grain size grows up obviously with the high temperature. The average grain size of WC is 0.7μm and the average size of (W, Ti, Ta)C is 3μm. © (2013) Trans Tech Publications, Switzerland.

Zhu Y.,Jiangsu University | Huang J.,Jiangsu University | Wang G.,Jiangsu University | Chen Y.,Chengdu Tool Research Institute Co.
Xitong Fangzhen Xuebao / Journal of System Simulation | Year: 2015

According to the relative motion of tool and workpiece, a new mechanical-thermal coupling finite element model of turning burr formation was established. It adopted supporting plate method to eliminate the influence of workpiece deformation which remained on the workpiece side. Operational efficiency improved greatly under this model. Based on the analysis of simulation results, it is discovered that there are both bending deflection and partly cutting occurred on cutting layer material. AISI1045 steel turning experiment was conducted, it is found that the results of simulation are close to the experimental. The model provides an effective way for analyzing the cutting heat, cutting force, workpiece deformation, stress flow and so on in the process of burr formation. ©, 2015, Editorial Office of Journal of System Simulation. All right reserved.

Chen J.,Jiangsu University | Wang G.,Jiangsu University | Wang G.,China Institute of Technology | Tian L.,Chengdu Tool Research Institute Co. | And 2 more authors.
Zhongguo Jixie Gongcheng/China Mechanical Engineering | Year: 2016

The HSK spindle-toolholder FEM was modeled and the stiffness and damp parameters of joint part were identified with elastic theory and damp theory. The HSK spindle-toolholder system could be divided into three parts, such as HSK spindle, spindle-toolholder joint part and toolholder. HSK spindle and toolholder could be simplified as Timoshenko beam, and the FRF could be gained with receptance coupling theory. The spindle-toolholder joint part might be simplified as spring-damp model, and the FRF could be achieved with multi-points receptance coupling theory. Then the FRF of system was gained with rigid coupling theory. The spindle-toolholder was treated as rigid connection, five-points connection and seven-points connection, and the tip-point FRFs of system were computed. At last, comparing these FRFs with experimental FRF, some results may be obtained. © 2016, CHINA MECHANICAL ENGINEERING Magazine Office. All right reserved.

Liang M.,Sichuan University | Wan W.,Sichuan University | Guo Z.,Sichuan University | Xiong J.,Sichuan University | And 4 more authors.
International Journal of Refractory Metals and Hard Materials | Year: 2014

Ti(C,N)-based cermets are fabricated with diverse contents of TiN addition by traditional powder metallurgy technique. The microstructure and properties are investigated and discussed. The influence of TiN content on the erosion and erosion-corrosion resistance is researched under alkaline conditions. Results reveal that the grain size decreases along with the increase of TiN. However, too much TiN results in incompact material and residual porosities in cermets. The grain size plays an important role in wear behavior. The effect of TiN content on erosion-corrosion of Ti(C,N)-based cermets is the same as that on erosion. It is advantageous for the wear resistance to add a small amount of TiN. Excessive TiN makes the wear resistance decrease on the contrary. In alkaline slurry, the cermets with coarse grains deteriorate largely due to corrosion which decreases the mechanical properties and speeds up the total loss of material. Nevertheless, the mechanical erosion is responsible for the degradation of cermets with fine grains. Cermets with 7.5 wt.% TiN addition have the highest erosion and erosion-corrosion resistance. © 2013 Published by Elsevier Ltd.

Chen J.,Jiangsu University | Chen J.,Chengdu Tool Research Institute Co. | Shang H.M.,Chengdu Tool Research Institute Co. | Tian L.,Chengdu Tool Research Institute Co. | Wang G.C.,Jiangsu University
Applied Mechanics and Materials | Year: 2014

The gear is widely used in manufacturing industry. The object of study is straight spur gear. According to the feature of involute gear, a three-edged indexable milling insert is designed. Firstly, the milling model is built in Deform3D. Then, the optimal relief angle is gained based on the cutting temperature and the optimal relief angle is 6°. The cutting parameters are researched and the optimal parameters are obtained according to the cutting force. © (2014) Trans Tech Publications, Switzerland.

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