Shanghai Spaceflight Manufacture Group Co.

Shanghai, China

Shanghai Spaceflight Manufacture Group Co.

Shanghai, China
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Mao J.-R.,Nanchang Hangkong University | Huang Y.-D.,Nanchang Hangkong University | Fu Q.,Nanchang Hangkong University | Zhang C.-C.,Shanghai Space flight Manufacture Group Co. | He P.,Harbin Institute of Technology
Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | Year: 2017

In order to improve the micro-resistance spot welding (MRSW) joint performance, two beryllium bronze sheets with thickness of 0.1 mm were welded with 0.05 mm-thick pure nickel foil as interlayer. The effects of interlayer on joint properties were investigated by the comparison of joints welded with or without Ni interlayer. The results show that the larger size of nuggets welding with Ni interlayer is observed, correspondingly, the shearing force increases by 79.2%. The ductile fracture is shown at faying surface. The cross section morphology of typical MRSW joint with Ni interlayer is characterized as fine cellular crystal in HAZ and equiaxed crystal in the centre or bottom area of joint. When welding with nickel interlayer, the joint is comprised of the fusion welding at center and brazing at peripheral region. As result, the bounding mechanism is changed. Further, the analysis results of thermal generation during MRSW show that Ni interlayer bring forth the contact resistance between Ni foil and beryllium bronze sheet and the bulk resistance of Ni foil which results in the increased resistance participated in whole heat generation. The improved MRSW joint performance results from the increased heat generation and enlarged brazing bonding area. © 2017, Science Press. All right reserved.


Cao J.Y.,Shanghai JiaoTong University | Wang M.,Shanghai JiaoTong University | Kong L.,Shanghai JiaoTong University | Guo L.J.,Shanghai Spaceflight Manufacture Group Co.
Journal of Materials Processing Technology | Year: 2016

A series of welds were produced at various processing parameters in friction spot welded of AA6061-T6 to investigate hook formation and mechanical properties. Two different types of hook defect were identified based on the locations, which were closely associated to the plunge depth. The weld strength had a negative correlation with the hook height. An increase in rotational speed, joining time or plunge depth increased the hook height and resulted in lower weld strength. Increasing plunge depth might also bring a positive effect of weld strength as a result of increased effective shear area. © 2015 Elsevier B.V.


Shen Z.,Tianjin University | Yang X.,Tianjin University | Zhang Z.,Tianjin University | Yin Y.,Shanghai Spaceflight Manufacture Group Co.
Hanjie Xuebao/Transactions of the China Welding Institution | Year: 2013

7075-T6 aluminum alloy was successfully spot joined by refill friction stir spot welding process. The microstructure, microhardness, tensile/shear strength and cross-tension strength of the joints were tested. Experimental results indicate that the microstructure can be divided into the nugget zone, thermo-mechanically affected zone, heat-affected zone and base material, respectively. Defects such as hook, cavity, incomplete fusion, incomplete refill and bonding ligament were found in the joint. The microhardness profile in the welded zone exhibited W-shaped appearance, but that in the stir zone exhibited V-shaped appearance. When the rotational speed was 1400 r/min, the highest tensile/shear strength reached 7916.0 N, which was 39.6% of the base material. The change of the cross-tension strength with the processing parameters was complicated, and the highest cross-tension strength can reach 43.9 MPa.


Shen Z.,Tianjin University | Yang X.,Tianjin University | Zhang Z.,Tianjin University | Cui L.,Tianjin University | Yin Y.,Shanghai Spaceflight Manufacture Group Co.
Materials and Design | Year: 2013

In the paper, the effects of processing parameters (rotational speed and duration time) on microstructure, mechanical properties of 6061-T4 aluminum alloy friction stir spot welds were investigated. Experimental results indicate that the microstructure and mechanical properties varied significantly depending on processing parameters, which significantly affect the hook geometry and material flow which in turn affected the size of stir zone. The hardness profile of the weld exhibited a W-shaped or an upside down V-shaped appearance and the minimum hardness was obtained in the periphery of the thermo-mechanically affected zone (TMAZ) and heat affected zone (HAZ). The tensile/shear strength increased with increasing tool rotational speed and duration time, in which, the rotational speed played a crucial role in determining the strength. The cross-tension strength increased dramatically with increasing duration time at the highest rotational speed. There was a direct correlation between the effective weld width and the strength, the presence of larger effective weld width resulted in stronger weld. Two failure modes were observed: shear fracture of the nugget under tensile/shear loading, and nugget debonding under cross-tension loading, the fracture path was associated to the hook geometry. © 2013 Elsevier Ltd.


Zheng M.,Tianjin University | Shen Z.,Tianjin University | Yang X.,Tianjin University | Yin Y.,Shanghai Spaceflight Manufacture Group Co.
Hanjie Xuebao/Transactions of the China Welding Institution | Year: 2016

Dissimilar aluminum alloys of 5052-H112 and 2024-T4 (2 mm) were successfully joined by refill friction stir spot welding. Defects-free joint was obtained under optimum welding conditions. However, the welding parameters window was rather narrow. At the high heat input, lots of defects such as ligament bonding, voids, cracks and kissing bonding appear, which accumulated at the interface and the path in which the sleeve plunges into the workpiece. The mechanical properties tests show that the preferable strength is obtained under lower heat input welding conditions, which is consistent with that the defects-free joint tends to form under lower heat input welding conditions. The failure of the joint occurred at the interface and the path where the sleeve plunges into the workpiece both under tensile and cross-tension loadings. The effective metallurgical bonding formed at the interface. © 2016, Editorial Board of Transactions of the China Welding Institution, Magazine Agency Welding. All right reserved.


Li J.-Z.,Dalian University of Technology | Luan J.-J.,Wuxi Micro Research Co. | Yu H.-L.,Dalian University of Technology | Zhang Y.-S.,Shanghai Spaceflight Manufacture Group Co. | Yu Z.-Y.,Dalian University of Technology
Dalian Ligong Daxue Xuebao/Journal of Dalian University of Technology | Year: 2011

To solve the electrode wear problem in three-dimensional micro-electrical discharge machining (3D micro-EDM), a new compensation method of combination of linear compensation method (LCM) with uniform wear method (UWM) is presented. The experimental results show that the machining efficiency and the roughness on the bottom surface are improved obviously in 3D micro-EDM, and the electrode wear is reduced using this new method. Compared with the UWM, the length of electrode wear decreases by 17.8%, the surface roughness reduces by 9.9% and the material removal rate increases by 10.1%.


Wang C.,Dalian Jiaotong University | Zhang X.,Shanghai Spaceflight Manufacture Group Co. | Tang C.,Shanghai Spaceflight Manufacture Group Co.
Advanced Materials Research | Year: 2011

Composite sandwich structures are extensively used in the aerospace, wind power, sports equipment, shipbuilding, automotive and train locomotive industries in order to improve structure rigidity and reduce weight. The molding process of sandwich structure using glass cloth and fibre materials as panels has been reported in many literatures. However, few researches are found relative to the molding process of large scale sandwich structure with the characteristics of thin-walled aluminum alloy panels and variable thickness of Polymethacrylimide (PMI) foam cores. This paper describes a preformed molding process that consists of thermoforming foam core blocks, assembling blocks into a whole sandwich core, CNC machining the sandwich core according to surface models of the thin-walled aluminum alloy panels, and finally, bonding and curing panels and sandwich cores. © (2011) Trans Tech Publications, Switzerland.


Wang C.,Dalian Jiaotong University | Zhang X.,Shanghai Spaceflight Manufacture Group Co. | Wang X.,Shanghai Spaceflight Manufacture Group Co.
Advanced Materials Research | Year: 2011

The large sandwich structure composed of thin-walled aluminum alloy panels, and variable thickness of honeycomb or Polymethacrylimide (PMI) foam core is usually manufactured by pre-bonded forming process, that is pre-forming panels and sandwich core, and then curing adhesive them to be sandwich structure. Welding process of large thin-walled panel causes the panel surface to be irregular and have greater errors relative to the design surface. Simply CNC machining the sandwich core according to the design surface cannot guarantee an exact match sandwich core consistent with the panels. The actual topography of the panels must be scanned. It is proposed that the use of a new hand-held laser scanner, Handyscan to scan large thin-walled curved surface parts, of Geomagic software to handle the acquired point clouds and construct the surface model. © (2011) Trans Tech Publications, Switzerland.


Jing H.J.,Shanghai Spaceflight Manufacture Group Co. | Yin C.H.,Shanghai Spaceflight Manufacture Group Co. | Zhou Q.J.,Shanghai Spaceflight Manufacture Group Co. | Tang C.Y.,Shanghai Spaceflight Manufacture Group Co.
Applied Mechanics and Materials | Year: 2014

Based on the analysis of features and NC-machining process of typical slots,a rule for slot-defining is given.An algorithm for toolpaths' generation is proposed in the paper,via automatically obtaining the driving information of slot features.On these basis,under the environment of VS2010,a feature-based NC-processing system aimed at slots is developed,by which NC program can be made automaticly.At last,a simulate-actual processing test is done.The result shows that the algorithm proposed is correct. © (2014) Trans Tech Publications, Switzerland.


Yin C.,Shanghai Spaceflight Manufacture Group Co. | Jing H.,Shanghai Spaceflight Manufacture Group Co. | Ren F.,Shanghai Spaceflight Manufacture Group Co.
Applied Mechanics and Materials | Year: 2012

The mechanism model of a spindle-rotating machine is proposed in this paper according to the mechanism theory. The movement model is established using coordinate transformation, and the solving of this model is discussed. Based on these, efficient algorithms for multi-choice and non-linear errors have been presented. A dedicated post-processor with non-linear error compensation function was developed by VS2010 language. A circle frame cutting experiment was conducted and the result showed that the algorithms were correct. © (2012) Trans Tech Publications, Switzerland.

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