The Chengdu Aircraft Industry Group or Chengdu Aerospace Corporation, a subsidiary of AVIC, is a Chinese aerospace conglomerate that manufactures aircraft parts as well as designs and manufactures combat aircraft. It was founded in 1958 in Chengdu, Sichuan province, China to be a supplier of aircraft for the Chinese military.The Chengdu Aerospace Corporation designed and now produces the Chengdu J-10B medium-weight multi-role fighter that is considered to be one of the most advanced in China's inventory, as well as the FC-1 / JF-17 light-weight multi-role fighter that is produced in cooperation with Pakistan. Wikipedia.
Liu D.,Chengdu Aircraft Industrial Co. |
Wang W.,KTH Royal Institute of Technology |
Wang L.,KTH Royal Institute of Technology
Procedia CIRP | Year: 2017
An energy-efficient cutting parameters determination method for NC machining parts with specified machining accuracy is proposed in this paper. The identification mechanism of machine tool errors by R-test is employed to establish machining error estimation model. By replacing the coordinate of each tool path point with the origin, the R-test tool paths are generated. R-tests at two different setups are designed to capture the volumetric errors of the machine tool. After dynamic R-test simulations at different feedrates in two setups, the volumetric errors of the machine tool at different feedrates are predicted. With the volumetric errors, the maximum machining errors of the part at different feedrates are calculated based on the machining error estimation model. The allowed feedrate range is obtained by comparing the calculated machining errors with the specified machining accuracy. With the allowed feedrate range and the other cutting parameters as the factors, the response surface of total energy consumption of machine tool is constructed according to the requirements of machining operations. The energy-efficient cutting parameters combination is found by searching the constructed response surface. A typical aircraft structural part is used to validate the proposed method. © 2017 The Authors.
Wang L.,KTH Royal Institute of Technology |
Wang W.,KTH Royal Institute of Technology |
Wang W.,University of Skövde |
Liu D.,Chengdu Aircraft Industrial Co.
CIRP Annals - Manufacturing Technology | Year: 2017
This paper presents a dynamic feature based adaptive process planning approach that can optimise machining cost, machining time and energy consumption simultaneously. The material removal volume of a dynamic feature is refined into non-overlapping volumes removed respectively by a single machining operation in which unified cutting mode is performed. Benefitting from this refinement, energy consumption is estimated analytically based on instantaneous cutting force as a function of real cutting parameters. Moreover, the cutting parameters assigned to each machining operation are optimised effectively in the unified cutting mode. This novel approach enhances the energy efficiency of NC machining through process planning. © 2017.
Xue G.,Chengdu Aircraft Industrial Co.
Proceedings of 2017 8th International Conference on Mechanical and Intelligent Manufacturing Technologies, ICMIMT 2017 | Year: 2017
The current FMS in small, high volume parts CNC machining process characteristics of flexible logistics is very outstanding. But in large, small batch parts CNC machining process to continuously explore the realization of flexible logistics still. This article in view of the large, small batch parts of NC machining process, fixture, blank parts logistics links of inquiry, puts forward a practical flexible logistics mode, provide a reference for the peer. © 2017 IEEE.
Han X.,Chengdu Aircraft Industrial Co. |
Tang L.,Chengdu Aircraft Industrial Co.
International Journal of Machine Tools and Manufacture | Year: 2015
Pocket corner is the most typical characters of aerospace structure components. To achieve high-quality product and stable machining operation, manufacturer constantly seek to control the cutting forces in pocket corner milling process. This paper presents the cutting force in corner milling considering the precision instantaneous achievements of tool engagement angle and undeformed chip thickness. To achieve the actual milling tool engagement angle in corner milling process, the details of tool-corner engagement relationship are analyzed considering the elements of tool trajectory, tool radius, and corner radius. The actual undeformed chip thicknesses in up and down milling operations are approached on account of the trochoid paths of adjacent teeth by a presented iteration algorithm. Error analysis shows that the presented models of tool engagement angle and undeformed chip thickness have higher precision comparing with the traditional models. Combined with the cutting force coefficients fitted by a series of slot milling tests, the predicted cutting force in milling titanium pocket with different corner structure and milling parameters are achieved, and the prediction accuracy of the model was validated experimentally and the obtained predict and the experiment results were found in good agreement. © 2014 Elsevier Ltd. All rights reserved.
Huang R.,Chengdu Aircraft Industrial Co.
Nanjing Hangkong Hangtian Daxue Xuebao/Journal of Nanjing University of Aeronautics and Astronautics | Year: 2010
The default pressure control algorithm for commercial software MARC is improved. The improved algorithm can limit the deformation rate based on the average strain rate of the elements with the 20 highest strain rates in superplastic forming. Pressure cycles are obtained and the finite element analysis is performed for a complex TC4 box-shaped part. The complex TC4 box-shaped parts are manufactured. The predicted profile is in agreement with that of the strain rate control algorithm and the measured thickness distribution. Thus, the better thickness distribution uniformity of the formed part is improved on the modified pressure cycle.
Li H.,Northwestern Polytechnical University |
Yang H.,Northwestern Polytechnical University |
Song F.F.,Northwestern Polytechnical University |
Zhan M.,Northwestern Polytechnical University |
Li G.J.,Chengdu Aircraft Industrial Co.
Journal of Materials Processing Technology | Year: 2012
Stress-relieved Ti-3Al-2.5V bent tube in hydraulic bleeding systems improves the overall performance of advanced aircraft and spacecraft due to its unique high specific strength. However, the high ratio of yield strength to Young's modulus may induce significant elastic recovery after unloading. The precision bending of the high strength Ti-tube (HSTT) depends on the understanding of the springback features and mechanisms. Using the plasticity deformation theory, the explicit/implicit 3D-FE and the physical experiments, the springback behaviors of the HSTT under multi-die constrained cold rotary draw bending (RDB) are addressed. The results show that: 1) The elastic recovery of the HSTT should be characterized by the significant angular springback, the radius growth and the sectional springback; Both the angular and radius springback should be compensated, while the sectional one decreases the cross-section flattening; 2) Among multiple parameters, both the material properties (Young's modulus, strength coefficient and anisotropy exponent) and the geometrical dimensions (bending angle and bending radius) dominate the unloading; Both the angular and radius springback values decrease with the smaller bending radii; The angular springback increases linearly with the larger bending angles, while the radius growth fluctuates little with the increasing of the bending angles at the later bending stages; Both the springback values of the HSTT are far larger than the ones of the 5052O Al-alloy tube and the 1Cr18Ni9Ti tube; The maximum variations of the angular and radius springback with changing of the processing parameters are 78% and 62.5% less than the maximum ones under different material properties and geometrical ones, respectively. 3) A two level springback compensation methodology is proposed to achieve the precision bending in terms of both springback angle and radius. © 2012 Elsevier B.V. All rights reserved.
Liu J.,Beihang University |
Zhang D.,Beihang University |
Qin L.,Chengdu Aircraft Industrial Co. |
Yan L.,Beihang University
International Journal of Machine Tools and Manufacture | Year: 2012
Carbon fiber reinforced plastics (CFRP) are used for various aircraft structural components because of their superior mechanical and physical properties such as high specific strength, high specific stiffness, etc. However, when CFRP are machined, rapid tool wear and delamination are troublesome. Therefore, cost effective and excellent quality machining of CFRP remains a challenge. In this paper, the rotary ultrasonic elliptical machining (RUEM) using core drill is proposed for drilling of holes on CFRP panels. This method combines advantages of core-drill and elliptical tool vibration towards achieving better quality, delamination free holes. The cutting force model and chip-removal phenomenon in ultrasonic elliptical vibration cutting are introduced and analyzed. The feasibility to machine CFRP for RUEM is verified experimentally. The results demonstrate that compared to conventional drilling (CD), the chip-removal rate has been improved, tool wear is reduced, precision and surface quality around holes is enhanced, delamination at hole exits has been prevented and significant reduction in cutting force has been achieved. © 2011 Elsevier Ltd All rights reserved.
Chang N.,Northwestern Polytechnical University |
Wang W.,Northwestern Polytechnical University |
Yang W.,Chengdu Aircraft Industrial Co. |
Wang J.,Queen's University of Belfast
Structural and Multidisciplinary Optimization | Year: 2010
Stacking sequence optimization (SSO) of laminate will greatly improve its mechanical properties without weight penalty. In this paper, a novel permutation discrete particle swarm optimization (PDPSO) method was proposed to perform SSO. To improve the efficiency of the algorithm, the concepts and techniques of valid/invalid exchange, checking memory and Self-escape were introduced into the PDPSO. In total 11 examples were presented. First, eight examples were carried out by employing the proposed method. The results show that the computational efficiency of PDPSO is greatly improved compared with standard discrete particle swarm optimization (SDPSO), and is comparable with that of gene rank crossover (GR) and partially mapped crossover (PMX). Then, three extra examples were presented, in which the outermost plies in the optimum design are not ±45° plies. The results show that the PDPSO has better stability and potential which demonstrate the better performance of PDPSO for laminates. Copyright © 2009 Springer-Verlag.
Sun Y.,Shandong University |
Sun J.,Shandong University |
Li J.,Shandong University |
Xiong Q.,Chengdu Aircraft Industrial Co.
International Journal of Advanced Manufacturing Technology | Year: 2014
An investigation was reported on the cutting temperature in milling Ti6Al4V by applying semi-artificial thermocouple. ANOVA was conducted on the experimental results, and regression models were obtained. Analysis results showed that the tool temperature and workpiece temperature performed a similar rising trend with the increase of cutting parameters, including cutting speed, feed rate, radial feed, and axial feed. And their influence degrees decreased successively. The cutting force with different cutting parameters was also measured, and the relationship between cutting temperature and cutting force was discussed. It was found that cutting temperature and cutting force obtained in the experiment had the same fluctuation feature. Therefore, the cutting force and cutting temperature could complement each other for monitoring and analysis of the cutting process. © 2013 Springer-Verlag London.
Chengdu Aircraft Industrial Co. | Date: 2016-09-19
Land vehicles; ships; water vehicles, namely, hydrofoil boats supported by single or multi hulls, and structural parts therefor; light rail vehicles; railway cars; aeroplanes; aircraft; aerial conveyors; boats; cable cars; unmanned aerial vehicles (UAVs).