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2020 Vol. 63, No. 23/24
Published: 2020-12-15
FEATURE
FORUM
RESEARCH
C0NTENTS
COVER STORY
APPROACHING SCIENCE
 
       FEATURE
14 Review of Fretting Fatigue Palliative Technology for Dovetail Joint of Titanium Alloy
YANG Qi, FU Xuesong,ZHOU Wenlong
DOI: 10.16080/j.issn1671-833x.2020.23/24.014
The fretting fatigue failure form and testing approach of blade-disk dovetail joint in the turbine engine are reviewed, the latest research progress of surface modification technology for improving the fretting fatigue properties of titanium alloys is summarized. The treatment process, strengthening mechanism of different technology and their applications in improving the fretting fatigue performance of titanium alloy blade are introduced. The existing problems in the research field are proposed.
2020 Vol. 63 (23/24): 14-22 [Abstract] ( 312 ) HTMLNew PDF (3719 KB)  ( 664 )
       COVER STORY
24 Simulation Method of Posture Alignment and Docking of Large Aircraft Components Based on DELMIA
SHI Xunlei，DENG Jianjian，GAI Yuhang，ZHANG Jiwen
DOI: 10.16080/j.issn1671-833x.2020.23/24.024
Based on the platform of DELMIA, a system simulation method for posture alignment and docking of aircraft large parts is proposed. After analyzing the overall assembly process and requirements, the difficulties such as simulation of parallel mechanism, motion process and interference analysis are studied: a design scheme of parallel posture alignment system with multi POGO sticks is proposed, which can simulate the united movement of multi POGO sticks and workpiece; the simulation of transportation, positioning, posture alignment, docking and other processes is realized by using Tag points and teaching functions in DELMIA; interference inspection of measurement system and product is added, which can detect the possible collision and light occlusion of laser tracker during the assembly process. Finally, the assembly process of a certain type of aircraft is simulated to verify the effectiveness of this method.
2020 Vol. 63 (23/24): 24-28 [Abstract] ( 396 ) HTMLNew PDF (3138 KB)  ( 445 )
       FORUM
32 Demand and Prospect of Intelligent CNC System
FAN Liuqun,LIU Chen,DING Kai,HUANG Yunying
DOI: 10.16080/j.issn1671-833x.2020.23/24.032
With the analysis of history and status of the numerical control system, the signs of different development stages are summarized focusing on composition structure, driving characteristics, process methods and functions. With the influence of PC and open architecture, numerical control system reaches a stage in which all flowers bloom together. Digitization, networking and intelligence have become the consensus for the development of intelligent manufacturing. CNC system has been on the road of digitization since its birth. Fieldbus, real-time Ethernet and industrial internet technologies not only enable the CNC system itself, but also realize network interconnection with the outside world. Based on the analysis of the demand of intelligent CNC machine tools, the technical routes and implementation cases of intelligent CNC systems at home and abroad are analyzed, and the key technologies and prospects for the development of intelligent CNC systems are given
2020 Vol. 63 (23/24): 32-39 [Abstract] ( 174 ) HTMLNew PDF (2662 KB)  ( 1215 )
40 Research on Architecture and Key Issues of PC–Based 3D Laser Machining CNC System
CHI Guanxin，WU Xiang，CUI Lijuan
DOI: 10.16080/j.issn1671-833x.2020.23/24.040
A three-dimensional laser cutting CNC system architecture with micro-step hardware interpolation as the core is proposed. The software tasks are analyzed and a real-time scheduling model of control functions is constructed. The real-time and multi-task coordinated control of the Windows platform is realized. Developed a micro-step hardware interpolation module based on DDA precision interpolation to meet the speed and accuracy requirements of motion control; built a core drive module to achieve interrupt response and servo control; combined space arc transfer theory and forwardbacktracking algorithm to develop the trajectory speed prediction and smoothing module; proposed the hardware frequency division adjustment method to realize the change of the feed rate. The 3D laser cutting numerical control system can realize high-speed and high-precision motion control, and the open structure of the combination of software and hardware improves the real-time performance of the system and the scalability of functions.
2020 Vol. 63 (23/24): 40-45 [Abstract] ( 188 ) HTMLNew PDF (1766 KB)  ( 275 )
46 Digital Twin System for CNC Machining
XIAO Wenlei,CAO Xian,ZHAO Gang,XIA Mingzhen,XING Hongwen
DOI: 10.16080/j.issn1671-833x.2020.23/24.046
Under the circumstance of intelligent manufacturing, CNC technology is developing towards more intelligent. The appearance of digital twin provides a new idea for the intellectualization of traditional NC machining. It is still lack of in-depth research that using digital twin to enhance the intelligence of NC machining. This paper discusses in detail the enhancement of digital twin technology in the intellectualization of NC machining from four aspects of perception, understanding, reasoning and service, and compares it with the traditional machining process. Through the introduction of independently developed digital twin system GrapeSim, the realization method of intelligent NC machining technology is described in detail. This system has been verified in COMAC, and a large number of tests have been carried out for actual machining parts, showing the improvement of machining intelligence and the practicability of digital twin system.
2020 Vol. 63 (23/24): 46-55 [Abstract] ( 369 ) HTMLNew PDF (3598 KB)  ( 1503 )
56 Smart CNC System Based on Microservice Architecture
ZHUO Yue, LIU Jiankang, FU Hongya, HAN Zhenyu
DOI: 10.16080/j.issn1671-833x.2020.23/24.056
CNC machine tools and basic manufacturing equipment have been listed as “strategic areas to accelerate breakthrough” in “made in China 2025”, and the high-end intelligent CNC system is the core component to ensure that CNC machine tools have high-speed, high-precision, compound, network, and intelligent functions. This paper proposes an open CNC system architecture based on microservice architecture. The CNC system is divided into a series of loosely coupled and independently deployed microservices by adopting the domain-driven design pattern to improve reconfigurability and scalability. Intelligent functions such as chatter suppression are packaged in microservices to realize hot-plug integration. An impeller cutting experiment is conducted. The results shows that the micro-service architecture intelligent CNC system has excellent dynamic expansion and reconfigurability, and the surface quality can be effectively improved after loading the intelligent algorithm.
2020 Vol. 63 (23/24): 56-60 [Abstract] ( 243 ) HTMLNew PDF (2864 KB)  ( 480 )
       APPROACHING SCIENCE
62 Innovative Advanced Material Welding and Joining Methods for Special Environment, Special Materials and Special Structure
2020 Vol. 63 (23/24): 62-63 [Abstract] ( 172 ) HTMLNew PDF (830 KB)  ( 62 )
       RESEARCH
64 Study on Pin Load Distribution of Bolted Joints for One Aircraft
LIU Hongfei,GAO Yukui
DOI: 10.16080/j.issn1671-833x.2020.23/24.064
A simplified spring–mass model was proposed to deal with the pin load distribution of bolted joints for one aircraft. The feasibility of simplified model was proven by a case of low pre-tightening force bolted joints. The reasons for huge error in the application of simplified model in high-torqued joint were analyzed. To solve the problem, a reduction coefficient of theoretical friction force and correction factors of pin load distribution based on similarity principle were used to modify the model. Results show that the modified model can greatly enhance the accuracy of predicting the pin load distribution of the reached structure with different applied loads and pre-tightening forces. This method provides a good reference for the simplified calculation of high pre-tightening force multiple-bolted joints.
2020 Vol. 63 (23/24): 64-71/101 [Abstract] ( 166 ) HTMLNew PDF (3001 KB)  ( 337 )
72 Construction of M–BOM for Aircraft Manufacturing Measurement Management
LIANG Qingxiao
DOI: 10.16080/j.issn1671-833x.2020.23/24.072
Intelligent manufacturing is an inevitable trend in the development of manufacturing technology. Experts believe that intelligent manufacturing has the characteristics of “state perception, real-time analysis, autonomous decisionmaking, accurate execution and learning promotion”, among them, “state perception” is an important way to realize intelligence, and the realization way of state perception is “measurement” , it can be said that “measurement” is the basis of intelligent manufacturing. Based on the characteristics and development trend of intelligent manufacturing, the development trend of aircraft manufacturing technology in intelligent aspect is prospected, the important position of measurement in aircraft manufacturing process and the existing problems of current measurement task management are analyzed. Based on the idea of aircraft manufacturing BOM, the concept of building measuring BOM in aircraft assembly is proposed. And the construction idea of measuring BOM is analyzed, and the significance of the construction of measuring BOM is explained.
2020 Vol. 63 (23/24): 72-79 [Abstract] ( 215 ) HTMLNew PDF (1592 KB)  ( 582 )
80 Research on Remanufacturing and Repairing Method of Aero-Engine Blade Based on Reverse Engineering
CHEN Zhenlin,CHEN Zhitong,ZHU Zhengqing, ZHANG Yun
DOI: 10.16080/j.issn1671-833x.2020.23/24.080
Aero-engine turbine blades are vulnerable to be damaged due to the serving environment of high temperature, high pressure and high speed. At present, the repair technologies of damaged blades have been a hotspot in the aircraft maintenance. In this paper, a method of remanufacturing and repairing aero-engine blades based on reverse engineering is studied by taking a turbine blade as an example. The target repairing surface reconstructed in this method based on non-damaged blade serving at the same time instead of the original design model will more accord with deformation state of damaged blades. Firstly, the damaged blade and non-damaged blade serving at the same time are scanned by the 3D blue-light scanner and the point cloud model of two blades can be acquired. Secondly, the repairing area and boundary can be identified after best fitting. And then, the errors between these two blades in repaired area will be predicted according to polynomial curves fitted by these errors in non-repaired area after registration. Furtherly, the section curves of target repairing surface can be obtained based on the predicted errors and section curves of non-damaged blade. Finally, the target repairing surface can be constructed using the skin method. And the constructed surface is used for the generation of NC tool paths which will achieve repair processing. The repaired results of the damaged blade are analyzed according to the reverse model of non-damaged blade. And the results show that the profile errors are basically within 0.03mm which meet the tolerance requirements of repairing blades and there are smooth transition between repaired and non-repaired areas. The method presented in this paper has a good effect on repairing aero-engine blades.
2020 Vol. 63 (23/24): 80-93 [Abstract] ( 255 ) HTMLNew PDF (2310 KB)  ( 526 )
87 Deformation Suppression Method for High-Speed Polishing of Optical Dome With High Ratio of Diameter to Thickness
ZHANG Hao, SHEN Yi, WANG Peng
DOI: 10.16080/j.issn1671-833x.2020.23/24.087
The high-speed polishing has become an indispensable means of spherical optical manufacture because of its process consistency and short production time. However, it is difficult to suppress deformation for optical domes with high ratio of diameter to thickness under high-speed rotation and high pressure. This limits application of high-speed polishing technology in manufacture of optical domes. In this paper, a modal analysis of high-speed polishing process for the optical dome with high ratio of diameter to thickness is demonstrated. Furthermore, a topological optimization of structure of the receipt is proposed and a series of experiments shows that the deformation cause by polishing process can be suppressed effectively.
2020 Vol. 63 (23/24): 87-93 [Abstract] ( 168 ) HTMLNew PDF (3484 KB)  ( 404 )
94 Numerical Simulation and Verification of Curing Deformation for Stringer Shaped Composite Parts
ZOU Yao, CAI Yujin
DOI: 10.16080/j.issn1671-833x.2020.23/24.094
Based on the micromechanical model and resin shrinkage theory, a numerical simulation model of composite curing deformation was established. This model is used to simulate the U-shaped and V-shaped typical parts and the variable curvature stringer of the canard. During the curing process, the maximum deformation simulation results of the U-shaped and V-shaped typical parts were 11.413mm and 1.908mm, and the maximum deformation results measured by the test were 9.148mm and 1.802mm, respectively. Tracking and monitoring the stringer of the canard, and based on the four locating holes of the parts, the accuracy of the curing deformation value between numerical simulation and actual production is 95.6%, which fully verified the accuracy of the numerical simulation model. Using the deformation result, the stringer tooling compensation surface is established, and the error between the simulation profile and the design profile is controlled within 4%, which meets the requirements of engineering application.
2020 Vol. 63 (23/24): 94-101 [Abstract] ( 163 ) HTMLNew PDF (3857 KB)  ( 397 )
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