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2020 Vol. 63, No. 7
Published: 2020-04-01
FEATURE
FORUM
RESEARCH
COVER STORY
 
       FEATURE
14 A Region-Division Method of Measurement Point Sampling for Thin-Walled Blade Sections Based on CMM
GAO Yuan,LIN Xiaojun, ZHANG Junqi,SHI Yaoyao
DOI: 10.16080/j.issn1671-833x.2020.07.014
The thin-walled blade has the characteristics of complex surface, poor rigidity, large and non-uniformly distributed machining error. The traditional sampling strategy only considers the geometric features, but ignores the machining error distribution. As a result, it may cause the loss of important shape information of the thin-walled blade, the waste of limited measuring resource and the restriction of the performance of CMM with high precision and efficiency. A region-division method of measurement point sampling is presented for these issues. It considers the machining error distribution as well as the geometric features. Firstly, the principle of measurement point sampling for the thin-walled blade is proposed. Secondly, the point sampling method is studied from two aspects, measurement region division and measurement point calculation. Finally, the proposed algorithm is verified and compared on an actual thin-walled blade. The results show that, the proposed method has a better reflection of the machining error when considering with the geometric characteristics, and can improve the measurement efficiency and accuracy.
2020 Vol. 63 (7): 14-20 [Abstract] ( 188 ) HTMLNew PDF (2131 KB)  ( 342 )
       COVER STORY
22 Microstructure Evolution of X2A66 Aluminum-Lithium Alloy During High Temperature Deformation
SHI Guodong, WANG Puguang,WANG Yunfeng, WANG Yuanyuan,LU Zheng,CHEN Ziyong
DOI: 10.16080/j.issn1671-833x.2020.07.022
The microstructure evolution of X2A66 aluminum-lithium alloy during hot deformation was analyzed. When the deformation temperature was 420°C and the strain rate was 0.01 s–1, sub-grain structure was incomplete in the matrix and a small amount of dynamic recrystallized grains were observed. When the deformation amount reached 80%, a flat and clear grain boundary and low dislocation density in the matrix can be observed. When the amount of deformation was greater than 80%, a large number of dislocations occurred in a part of the grain and impeded dislocation motion around the precipitated phase. T1 phase appeared to be broken and remelted and the δ′ phase was precipitated during high temperature deformation. The crushing and remelting of the T1 phase caused the matrix to re-saturate, especially the supersaturation of the Li element, which promoted the precipitation of the δ′ phase. The precipitation phase inside the grain boundary can effectively hinder the dislocation movement and increase the nucleation rate of recrystallized grains. The precipitated phase pinned on the grain boundary reduced the dynamic recrystallization rate by hindering the movement of the grain boundary and the sub-grain boundary
2020 Vol. 63 (7): 22-27 [Abstract] ( 189 ) HTMLNew PDF (5545 KB)  ( 188 )
       FORUM
30 Technique Research and System Development for Sheet Metal Edge Inspection Based on Binocular Vision
LIU Zhiyuan, ZHANG Liyan
DOI: 10.16080/j.issn1671-833x.2020.07.030
Aiming at the real-time and precise inspection of sheet metal part edges, a binocular vision-based inspection system that mainly consists of two CMOS cameras and multiple line laser transmitters is developed. The handheld inspection device is continuously moved around the edge of the measured sheet metal part with the circular marks on the surface, while the line laser transmitters project laser stripes to the edge of the sheet metal part. The cameras acquire the synchronized image pair in real time and transmit them to the computer. The system software performs incremental 3D reconstruction of the laser stripe centers on the sheet metal edge in real time via parallel processing. The workflow, software and hardware structure of the system are introduced. The key techniques such as real-time extraction of laser stripe center points and real-time registration of the 3D measurement points are discussed in detail. The inspection speed of the developed system is verified to be more than 30fps, and the measurement points on the sheet metal edges output by the system is of high quality. Moreover, experiments on a planar side wall with 1mm thickness shows that the mean inspection error of SMEIS system is about 0.04mm, and the standard deviation is about 0.03mm.
2020 Vol. 63 (7): 30-39 [Abstract] ( 188 ) HTMLNew PDF (18825 KB)  ( 433 )
40 Research on Digital Inspection Technology of Geometry Size for Commercial Aero-Engine Based on Model
WANG Zhenxing, CAO Wei, JIN Wei, ZHENG Fangfang
DOI: 10.16080/j.issn1671-833x.2020.07.040
For the reason that the traditional geometrical size inspection of workpiece was not suitable for the future production of commercial aero-engine, some key digital inspection technologies of geometrical size of commercial aeroengine based on model, including PMI (product manufacturing information) recognition, inspection routing creation, release of the three-dimensional report and so on, were researched in the paper. The method could save the inspection programming time and reduce the impact caused by work staff’s lack of programming experience, which could improve inspection efficiency and consistency of inspection results. Meanwhile, the method was good for realizing fast collaboration between design and manufacturing of commercial aero-engine by using the uniform model data among design, technology and inspection. Finally, the applicability of the proposed method for the inspection of workpiece geometrical size of commercial aero-engine was validated by a case verification.
2020 Vol. 63 (7): 40-46 [Abstract] ( 259 ) HTMLNew PDF (2927 KB)  ( 330 )
47 Extraction Method of Gap and Flush of Three-Dimensional Seam Point Clouds Based on SVM
ZHANG Bo,LI Shuanggao,HAO Long, ZHU Kui
DOI: 10.16080/j.issn1671-833x.2020.07.047
Gap and flush generated among aircraft assembly should satisfy specific requirements, which should be precisely extracted in order to ensure the quality of assembly. Because of seam’s uneven size and noise of the data, gap and flush are difficult to extract accurately. Therefore, this paper proposes a method to extract gap and flush of threedimensional point cloud of seam based on SVM (Support Vector Machine). Firstly, mathematical model is established according to distribution characteristics of point cloud, in order to identify the feature points that need to be extracted. Secondly, measuring position points are planned and discreted according to the boundary of the digital model. Take the measured position points as the geometric center, and subpoint cloud is extracted based on PCA (Principal Component Analysis) and bounding box. Thirdly, point cloud is segmented by hyperplane which is adjusted. Then, boundary points, edge points and critical points are extracted by triangler point cloud. Finally, gap and flush are extracted according to mathematical models. The accuracy and stability of the method were verified through designed experiments. Experiments show that gap measurement mean error is less than 0.03mm as well as the flush measurement mean error is less than 0.02mm.
2020 Vol. 63 (7): 47-54 [Abstract] ( 193 ) HTMLNew PDF (11006 KB)  ( 85 )
55 Error Analysis and Compensation for Slice Component Precision Assembly
WANG Tao,LUO Yi， WANG Xiaodong, LI Yawei
DOI: 10.16080/j.issn1671-833x.2020.07.055
Automatic alignment and assembly of slice components is widely used in precision fabrication of aviation components. In order to meet the requirements of positioning accuracy, an automatic assembly system based on machine vision is developed to realize the coaxial assembly between the slice component and the base. Firstly, the camera’s pixel is calibrated to improve the accuracy of machine vision calculation; then the angler error of the linear guidance in the visual measurement module and assembly operation module is measured, the compensation algorithm is established to eliminate the influence of the angler error; The images of the slice component and the top circular on base are larger than the camera’s field of view, thus the images should be mosaic before getting the key characteristic. The angler error also should be incorporated in the mosaic. Finally, aiming at the random error caused by adhesion when the sheet assembly is released, a rigid adsorption head is designed to reduce the error. With the above error compensation methods, the assembly coaxiality of the slice component is reduced from 292.4μm to 19.6μm.
2020 Vol. 63 (7): 55-61 [Abstract] ( 150 ) HTMLNew PDF (9423 KB)  ( 110 )
       
62 To Gear up Precision Engineering Towards to National Demands
2020 Vol. 63 (7): 62-63 [Abstract] ( 119 ) HTMLNew PDF (1555 KB)  ( 102 )
       RESEARCH
64 Developments in High-Performance Elevated-Temperature Aluminum Alloys and Their Composites Produced via Rapid Solidification and Powder Metallurgy
LI Peiyong
DOI: 10.16080/j.issn1671-833x.2020.07.064
Rapid solidification technology provides a possible route to prepare elevated-temperature aluminum alloys. Al–Fe–V–Si, Al–Fe–Mo–Si, Al–Fe–Cr–Ti, etc., series high-performance elevated-temperature aluminum alloys and their composites with heat resistance at temperatures of 300–400℃ have been successfully developed by rapid solidification/powder metallurgy process in nearly thirty years. In this paper, the developments in process, composition, microstructure, properties and applications for these elevated-temperature aluminum alloys and their composites are summarized, the existing problems and future directions are discussed.
2020 Vol. 63 (7): 64-85 [Abstract] ( 288 ) HTMLNew PDF (2350 KB)  ( 752 )
79 Research on Connection Model of Industrial Device to Cloud Platform
XIE Pengzhi, YANG Wei, CAO Wei
DOI: 10.16080/j.issn1671-833x.2020.07.079
With the development of cloud computing, cloud manufacturing technology has become an important means to integrate and distribute manufacturing resource. The application of the cloud manufacturing is grounded on the technology of industrial device connection to the cloud platform. However, problems as a wide variety of communication protocols for heterogeneous devices, the complexity of data security guarantee and inconsistent data interface standards make it difficult for industrial equipment to connect to the cloud platform. This paper has designed such a connection model with IMQ (Industrial Message Queue) as the pivot, which provides the industrial device an access to cloud platform. This model has defined the capabilities of IMQ and IMQ adapters making it possible for heterogeneous devices to connect to the cloud platform. Besides, it has set up an agreed protocol for IMQ adaptation and data publishing which can unify data interface standards and ensure data security. This connection model puts forward new ideas and new methods for industrial device connection to the cloud platform in the future.
2020 Vol. 63 (7): 79-85 [Abstract] ( 148 ) HTMLNew PDF (1718 KB)  ( 207 )
86 Applications of Thermoplastic Composites on Aero-Engine Nacelles
ZHOU Bingjie, ZHANG Daijun,ZHANG Yingjie,WANG Wei,YAO Jianan
DOI: 10.16080/j.issn1671-833x.2020.07.086
Thermoplastic composites (TPCs) have been widely applied to commercial aircrafts and helicopters because of their good toughness, heat resistance, fatigue strength, chemical resistance and recycling for recent years. With regard to aircraft engines, there is an even more urgent demand for high performance materials to achieve higher thrustweight ratio. Thus, TPCs are the ideal materials to manufacture aero-engine nacelles. This article introduces foreign developments on prepreg research and advanced manufacturing process of high performance TPCs, as well as, whose applications on aircraft engine nacelles. Meanwhile, domestic developments have also been contrasted in thermoplastic resin properties, prepreg preparation and manufacturing process of TPCs.
2020 Vol. 63 (7): 86-91 [Abstract] ( 296 ) HTMLNew PDF (7780 KB)  ( 343 )
92 Research on Array Machining of Turbine Blade Tenon Side Fillet
WANG Xiaodong,ZHANG Yun,CHEN Zhitong,LIU Ruisong,LIU Suijian,WU Zhixin
DOI: 10.16080/j.issn1671-833x.2020.07.092
Aero-engine turbine blade is the core part of the engine, and blade processing is usually based on blade tenon as the process datum, so the machining of blade tenon has a crucial impact on the whole blade. For the fillet of blade tenon side, now the common CNC processing technology in factories is: first in the multi-axis machining center for milling and then mechanical finishing. However, conventional multi-axis simultaneous milling has low efficiency, complex equipment and high processing cost. Therefore, based on the rectangular array CNC machine tool (3-axis simultaneous), this paper presents the process system of superhard abrasive grinding, polishing and rounding. Among, the combined process of NC grinding and polishing with superhard abrasive solves the problem of low machining efficiency and poor surface quality of inverted milling, and the accuracy of the rounded corner on the side of the mortise can be up to 20μm. The use of multi-spindle rectangular array CNC machine tool (3-axis simultaneous) greatly reduces the cost of equipment compared to the original multi-axis machining center, and the machining time of a single tenon side fillet is shortened within 180 seconds, laying a foundation for the use of more spindle machine tool rectangular array machining.
2020 Vol. 63 (7): 92-101 [Abstract] ( 218 ) HTMLNew PDF (4914 KB)  ( 433 )
96 Research on Forming Technology of Complex Aeronautical Sheet Metal Components With Large Curvature and Variable Section
LI Xiaojun, DONG Jinliang, MEN Xiangnan, DENG Tao, ZENG Yipan, CHENG Jing
DOI: 10.16080/j.issn1671-833x.2020.07.096
The “rainbow” part has such complex characteristics as long size, large curvature, variable cross-section and small angle, half of which is joggle, structural distortion and so on. For a long time, this kind of complex parts had been formed by the method of “hammer forming + manual correction”. The forming quality was poor, and a lot of manual correction work was needed in the later stage, resulting in low processing efficiency and qualified rate. In this study, by disassembling the structural characteristics of the part, the existing technology and equipment resources, a cross-specialty combined forming process of “profiles + sheets” was proposed, and the application of stretch-bending technology of profiles in the forming of aeronautical sheet metal components with large curvature, variable cross-section and small angle was explored. Through the process test, the forming parameters of the part are verified and optimized continuously, and the precise forming of the part is finally realized.
2020 Vol. 63 (7): 96-101 [Abstract] ( 214 ) HTMLNew PDF (6106 KB)  ( 2160 )
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