Huang Y.,Chongqing University |
Wang Y.,Chongqing University |
Li H.,Xian Aerospace Engine PLC |
Chen Y.,Chongqing University |
Yang Z.,Chongqing University
International Journal of Abrasive Technology | Year: 2015
In order to improve dimensional accuracy of aero-engine blade edges, surface removal contour (SRC) model is applied to the engine blade grinding in this study. Firstly, according to variable curvature of characteristics the engine blades, this paper adopts the semi-Hertz contact theory to simulate grinding contact state. Secondly, surface removal contour model was deduced from the material removal rate (MRR) nonlinear model, and the model of the final grinding depth is proposed, and the model consider the influence of path interval. Thirdly, for determining the parameters of MRR nonlinear and linear model, abrasive belt grinding experiment is carried out, which shows the relative error of MRR nonlinear model to be -1.1 ↓ ∼1.4 ↓. The application of abrasive belt grinding on the blade showed the maximum error of the processing is within 0.05 mm and the abrasive belt grinding process system is stable. © 2015 Inderscience Enterprises Ltd.
Miao M.,Xian Aerospace Engine PLC
Jingangshi yu Moliao Moju Gongcheng/Diamond and Abrasives Engineering | Year: 2015
A new method which was grinding at constant pressure with accumulated abrasive belt was proposed to grind nickel-base superalloy GH4169.It used constant pressure grinding technology to achieve pressure control in the process of grinding, so as to reduce the impact of cutting force on grinding characteristic and obtain high efficiency, high precision grinding of hard machining material by adopting accumulative abrasive belt with self-sharpening effect. By orthogonal grinding experiments on nickel-base superalloy specimens, the impacts of grinding process parameters, such as abrasive belt velocity, grinding pressure and vibration frequency were analyzed. The optimal process were obtained according to range analysis, which influenced material removal and belt wear. © 2015, Zhengzhou Institute of Abrasives Grinding. All right reserved.
Sun C.,Xian Aerospace Engine PLC |
Zhang G.,Chongqing University |
Yin J.,Chongqing University
Jingangshi yu Moliao Moju Gongcheng/Diamond and Abrasives Engineering | Year: 2016
Accumulated abrasive belt was used to grind nickel-based superalloy GH4169 at constant pressure. This method could control the pressure during grinding, so the impact of cutting force on grinding characteristics was reduced. By grinding nickel-based superalloy specimens through orthogonal experiment and range analysis, the optimal grinding parameters were obtained to gain the best surface roughness. The results showed that when the process parameters were grinding pressure 60 N, vibration frequency 1 Hz, and belt speed 34 m/s, the surface roughness would be Ra 0.072 μm, which reached its optimum. Meanwhile, the results verified the feasibility of this method and provided experimental basis for machining the material workpiece with suitable grinding parameters in production. © 2016, Zhengzhou Institute of Abrasives Grinding. All right reserved.
Fu Y.,Nanjing University of Aeronautics and Astronautics |
Zhang Z.,Nanjing University of Aeronautics and Astronautics |
Xu J.,Nanjing University of Aeronautics and Astronautics |
Zhao Z.,Nanjing University of Aeronautics and Astronautics |
And 5 more authors.
Nanjing Hangkong Hangtian Daxue Xuebao/Journal of Nanjing University of Aeronautics and Astronautics | Year: 2014
In view of the poor machinability of turbine blade root made of directional solidified nickel-based superalloy DZ125, high efficiency deep grinding(HEDG) process is conducted to analyze specific grinding energy and surface integrity with profiled electroplated CBN grinding wheel. The result shows that higher grinding speed vs can lower the specific grinding energy effectively when the speed ratio (vs/vw) keeps constant. The specific grinding energy decreases with the increasing mean material removal rate and finally remains in range of 40-60 J/mm3. Under the same mean material removal rate, the specific grinding energy increases with the decreasing depth of cut. However, the difference of depth of cut has little effect on the specific grinding energy with the same undeformed chip thickness. The surface quality of the workpiece obtained under the highest mean material removal rate is analyzed. The surface texture is clear, and does not present wrinkles and ploughing marks. The phase transition and grain distortion are not observed from the metallographic microstructure. The degree of work hardening is in range of 7.7%-19%, and the hardening depth is about 40 μm. The result reveals the potential of HEDG in the high efficiency machining of turbine blade root DZ125, and provides reference for future application.