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2020 Vol. 63, No. 5
Published: 2020-03-01
FEATURE
FORUM
RESEARCH
C0NTENTS
COVER STORY
 
       FEATURE
14 Robotic Floating Belt Grinding Technology and Experimental Study on Aero-Engine Titanium Alloy Blade
HUANG Yun, HOU Mingming,LIU Yang,XIAO Guijian, ZHANG Youdong, SONG Kangkang
DOI: 10.16080/j.issn1671-833x.2020.05.014
Compressor titanium alloy blade is a key part of aero-engine, and its manufacturing quality and processing accuracy have a crucial impact on the overall performance. Due to the complicated structure of the blade profile, the grinding work is often done manually, the grinding efficiency is low, and the consistency of the grinding quality is difficult to guarantee. Therefore, this paper analyzes the floating belt grinding technology for robotic belt grinding of aeroengine titanium alloy blades, and conducts relevant experimental research. The experimental results show that the robotic floating belt grinding technology of titanium alloy blades can meet the grinding requirements of titanium alloy blades. The surface roughness Ra of the blades after grinding is within 0.4µm, and the three-dimensional topography of the surface is consistent. The shape of the exhaust side maintains a certain roundness.
2020 Vol. 63 (5): 14-19 [Abstract] ( 227 ) HTMLNew PDF (7294 KB)  ( 203 )
       COVER STORY
20 Test Research on Rotation Accuracy of Hybrid Spindle of High-Efficiency Precision Grinding Machine
GUO Li,ZHANG Hua
DOI: 10.16080/j.issn1671-833x.2020.05.020
The spindle rotation accuracy of a high-efficiency precision CNC grinding machine is tested by using the spindle rotation accuracy tester produced by Lion Precision Company. The results show that the spindle rotation accuracy of the grinding wheel spindle system is very high. The results of the research on rotation accuracy, static rigidity, vibration resistance and thermal stability of the grinding wheel spindle show that it is a grinding wheel spindle with excellent performance. This will improve the grinding performance of CNC grinding machines.
2020 Vol. 63 (5): 20-24 [Abstract] ( 184 ) HTMLNew PDF (2414 KB)  ( 323 )
       FORUM
28 Study on Precision Stability of Precision Machine Tool Based on Joint Surface Error Model
SUN Yewang, YANG Qiujuan,CAO Ye, LIU Yuzhu,SONG Yupeng,MA Xichao
DOI: 10.16080/j.issn1671-833x.2020.05.028
 In order to study the influence of the joint part on precision stability of a machine tool, according to the characteristics of the column fastening joint surface of the precise vertical machine tool, the fastening joint surface feature with original error is measured. Then, the NURBS mathematical method is used to model the curve surface, and the 3D assembly model including the geometric surface feature error is created. Based on the joint characteristic error model, the boundary constraint load conditions from 500N to 8500N with gradual change is set. Based on the analysis of the non-uniform variation characteristics of stress field of non-uniform contact joint with characteristic error, the results show that there is a three-stage variation law in the joint region. It includes a large slope linear change stage, a curve change stage, and a small slope linear change stage. In particular, this variation characteristic is rooted in the nonlinear variation characteristic of the non-uniform contact of the high points, and it is verified that the geometric feature error of the geometric surface has a significant influence on the accuracy stability of the micron precision motion system.
2020 Vol. 63 (5): 28-34 [Abstract] ( 181 ) HTMLNew PDF (6341 KB)  ( 239 )
35 Research on Comprehensive Error Real-Time Compensation Method for SIEMENS CNC Machine Tools
XIAO Xiao,ZHANG Pin,WEI Yafei,WANG Jian,LIAN Chengzhe,YE Wenhua
DOI: 10.16080/j.issn1671-833x.2020.05.035
Error compensation technology is an effective and economical method to improve the machining accuracy of machine tools. Based on the temperature compensation function provided by SIEMENS numerical control system and the comprehensive error model based on BP neural network, a real-time compensation method of comprehensive errors for machine tool is proposed. Based on the proposed error compensation method and ARM platform, a set of real-time error compensation system is designed and developed. The comprehensive error compensation experiment of machine tools during processing is tested on linkage gantry CNC machine tool QLM27100. The experimental results show that the maximum error of the test part is reduced by 59.1%, which verifies the effectiveness of the compensation method.
2020 Vol. 63 (5): 35-40 [Abstract] ( 184 ) HTMLNew PDF (4082 KB)  ( 350 )
41 Design and Research on Gear Chamfering Machine Control System Based on Quantum Frame
ZHANG Yabin, HONG Rongjing,ZHANG Aomin
DOI: 10.16080/j.issn1671-833x.2020.05.041
In order to improve the degree of automation of the gear chamfering process and the reuse rate of the software frame structure, based on the hierarchical state machine theory, quantum frame theory and embedded system implementation technology, a numerically controlled gear chamfering is proposed to design methods of angle control system. Hardware part of the system mainly includes an industrial control computer, solid high GTS series eight-axis motion card, and an open CNC system for gear chamfering. Software part introduces the relevant content of the quantum frame, and gives the organization structure of the quantum frame and the system diagram of the gear chamfering numerical control system. Finally, a processing software capable of logically controlling the chamfering machine was developed. Tests show that the gear chamfer CNC system designed by quantum frame technology has higher reliability, and reduces the difficulty of developing and designing control system software.
2020 Vol. 63 (5): 41-45 [Abstract] ( 166 ) HTMLNew PDF (1947 KB)  ( 217 )
46 Study on Contact Characteristics of Air Spindle With Small Elastic Grinding Tool
CHEN Dengling, PENG Yunfeng, ZENG Xinlong, MENG Qinghui, LI Chenlei
DOI: 10.16080/j.issn1671-833x.2020.05.046
To solve the problem of grinding complex shaped workpieces, a small volume and high speed air spindle with small elastic grinding tool was designed. The theoretical removal function model of the spindle was established and verified by experiments. The results show that the removal functions obtained by simulation and experiments are highly consistent and close to Gaussian-like shape, which belongs to the ideal removal function. On this basis, the spindle with the elastic resin grinding tool was used for grinding experiments, and the influence of the main process parameters on the surface quality of the workpiece was explored. The surface roughness of the workpiece after grinding decreases from 3.588μm to 0.401μm, which proves that the air spindle can be used for high-precision grinding, and provides theoretical basis for high-speed grinding of complex shaped workpiece.
2020 Vol. 63 (5): 46-51 [Abstract] ( 152 ) HTMLNew PDF (6919 KB)  ( 86 )
52 Structure Design and Simulation on Guideway Protective Cover of Machine Tool
LIU Jiang, XU Xiaodong, WANG Zhaotao
DOI: 10.16080/j.issn1671-833x.2020.05.052
Guideway protective cover of machine tool is an important part which is used to protect the machine guide rail from external corrosion and damage. The general guideway protective cover of machine tool has simple structure and its cost is low. However, in the case of high speed movement of the machine tool, the block of one layer and the baffle of the next layer will produce severe impact, resulting in structural damage. For the purpose of its high-speed motion at the speed of 90–120m/min, two improvement schemes are proposed: adding metal rubber to the floor edge and using shear structure (improved hinge structure). Modeling was done in Solidworks and simulation was done in ANSYS Workbench. In conclusion, it was proven that adding metal rubber in the appropriate position of the baffle was feasible
2020 Vol. 63 (5): 52-59 [Abstract] ( 219 ) HTMLNew PDF (2998 KB)  ( 435 )
       
60 Being Patriotic Aerospace Engineers With Dedicated and Pragmatic Spirit
2020 Vol. 63 (5): 60-61 [Abstract] ( 211 ) HTMLNew PDF (2110 KB)  ( 321 )
       RESEARCH
62 MEMS Sensors for High Temperature Measurement on Nozzle Guide Vane Surface
DUAN Li， JI Zhonglin,WENG Haotian,LI Jibao,LIN Yuzhen,CAO Xueqiang
DOI: 10.16080/j.issn1671-833x.2020.05.062
Thin film high temperature sensors have been successfully fabricated on the surface of aero-engine turbine blade by the aid of MEMS micro manufacturing technology. A series of key challenges such as high temperature insulation, lithography on the curved surface, high temperature interconnection have been overcome during the endeavor of the sensor development. The thin film sensor together with the connecting wires can stand for the tough vibration and shocking test (10–2000 Hz/40g vibration intensity and 8g semi-sinusoidal impulse shocking test). The embedded thin film MEMS thermocouple sensor is also capable to detect the high temperature up to 1200℃ in the burning air flow inside aeroengine combustion chamber. The advantage of these thin film sensors is small in size and easy to install, therefore avoiding the disturbance to the environment and less destruction to the blade as possible. They can also be made in batch to form a sensor array for high temperature distribution studies.
2020 Vol. 63 (5): 62-67 [Abstract] ( 219 ) HTMLNew PDF (23973 KB)  ( 112 )
68 Study on Numerical Simulation of Resin Flow of Advanced Composite Materials Manufactured by Vacuum Assisted RTM Process
LI Chen,HUANG Jia,CHEN Cheng,GAO Limin
DOI: 10.16080/j.issn1671-833x.2020.05.068
Liquid composites molding is a low cost and high efficiency process of composites manufacturing.The presented work is based on Richard’s equation and a contour function to predict the pressure field and resinflow front tracking at transient situation of VARTM (vacuum assisted resin transfer molding) process. Finite element method (FEM) is applied to carry out the numerical simulation realized by COMSOL Multiphysics software. A parameter named infusion ratio λ to compare the results of numerical simulation and the experiment. Good matching of the results is achieved to prove the credibility of this method.
2020 Vol. 63 (5): 68-73 [Abstract] ( 195 ) HTMLNew PDF (18615 KB)  ( 136 )
74 Research on Robot Assisted Polishing Technologies for Large Aircraft Shaping Mold
LEI Pei, ZENG Debiao, JIANG Kailin,XU Jun, ZHANG Yongbing,MENG Hualin, TAN Hong, PAN Deng
DOI: 10.16080/j.issn1671-833x.2020.05.074
For polishing large aircraft shaping mold in manual way, there are some problems that can not be settled including low efficiency, poor quality, lack of measuring instrument, bad working condition. To solve these problems, a robot assisted polishing system is proposed which consists of industrial robot, multiple function end effectors, acoustic emission equipment, process planning and simulation software and integrated controlling software. The key technologies including adaptive controlling of polishing force, intelligent process planning and online measurement of roughness are proposed in this paper to realize automatic polishing for large shaping mold with high efficiency and closed loop control of quality.
2020 Vol. 63 (5): 74-79 [Abstract] ( 172 ) HTMLNew PDF (9259 KB)  ( 152 )
80 Location and Adjustment Technology for Mobile Robot Based on Artificial Landmark
LI Junjie,HUANG Xiang,LI Shuanggao,ZENG Qi,ZHU Kui
DOI: 10.16080/j.issn1671-833x.2020.05.080
About measuring large-scale components of aircraft, there is a problem that the mobile robot cannot reach the station accurately when measuring equipment transfers automatically. Therefore, this paper puts forward the mobile robot positioning and adjustment based on artificial landmarks to realize the precise positioning during the transfer. Next, this paper designs an artificial landmark using the laser tracker which can obtain coordinates of the landmark in the global coordinate system. Besides, this paper introduces the coding method, the solution method of the pose of the landmark and the posture adjustment strategy of the mobile robot. Finally, based on experiments, this paper comes to a conclusion that the position and angle errors measured by artificial landmarks are small, and the accuracy requirement of the automatic transfer station can be met using mobile robot positioning and artificial landmarks.
2020 Vol. 63 (5): 80-86 [Abstract] ( 167 ) HTMLNew PDF (3632 KB)  ( 290 )
87 Research Progress on Continuous CF/PEEK Prepreg Manufacturing Technology
QU Liduan, CHEN Shuhua, SHEN Zhen, YAN Liansheng
DOI: 10.16080/j.issn1671-833x.2020.05.087
The manufacturing technology for continuous carbon fiber reinforced polyetheretherketone (CF/PEEK) prepreg is melt impregnation, powder suspension and compound molding, and the advantages and disadvantages of each technology are analyzed. By summarizing the development status of each technology, the development hot spot of melt impregnation technology is the improvement of impregnation mold; the development hot spot of powder suspension technology is the improvement of dispersion system, the development hot spot of mixed molding technology is the weaving method of carbon fiber and resin fiber.
2020 Vol. 63 (5): 87-92 [Abstract] ( 389 ) HTMLNew PDF (1452 KB)  ( 1077 )
93 Study on Factors Affecting Chip Formation During Cutting GH4169 Under High Pressure Cooling
WANG Weixin, WU Mingyang, LI Baowei, WANG Xinyu, CHENG Yaonan
DOI: 10.16080/j.issn1671-833x.2020.05.093
Superalloy is a typical difficult-to-machine material. When cutting GH4169 by PCBN tools, it has large cutting forces, high cutting temperature, and difficult chip shape control. As a new processing technology, high pressure cooling can effectively reduce the cutting temperature and improve the breaking capacity of the chips. In this paper, the theoretical analysis of chip bending moment under high pressure cooling was carried out to obtain the theoretical model of chip bending moment. Secondly, based on the experimental study, the influences of different cutting parameters, cooling pressure and tool chamfering parameters on chip length, crimp radius and chip width were studied, which provide a reference for further promoting chip control.
2020 Vol. 63 (5): 93-102 [Abstract] ( 167 ) HTMLNew PDF (4424 KB)  ( 291 )
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