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An Q.,Shanghai JiaoTong University | Wang C.,Shanghai JiaoTong University | Xu J.,Shanghai JiaoTong University | Liu P.,Shanghai Aerospace Precision Machinery Research Institute | Chen M.,Shanghai JiaoTong University
International Journal of Refractory Metals and Hard Materials | Year: 2014

High strength steel 30Cr3SiNiMoVA (30Cr3) is usually used to manufacture the key parts in aviation industry owing to its outstanding mechanical properties. However, 30Cr3 has poor machinability due to its high strength and high hardness. Hard milling is an efficient way in machining high strength steels. This paper investigated hard milling of 30Cr3 using a PVD-AlTiN coated cemented carbide tool with regard to cutting forces, surface roughness, chip formation and tool wear, respectively. The experimental results indicated that the increase of cutting speed from 70 to 110 m/min leads to direct reduction of cutting forces and improvement of surface finish, while both feed rate and depth of cut have negative effect on surface finish. The occurrence of oxidation on chip surfaces under high cutting temperature makes the chips show different colors which are strongly influenced by cutting speed. Saw-toothed chips were observed with the occurrence of the thermo-plastic instability within the primary shear zone. Micro-chipping and coating peeling were confirmed to be the primary tool failure modes. Serious abrasion wear and adhesive wear with some oxidative wear were confimed to be the main wear mode in hard milling of 30Cr3. © 2013 Elsevier Ltd.


Lu B.,Shanghai University of Engineering Science | Wang D.,Shanghai University of Engineering Science | Xiao L.,Shanghai Aerospace Precision Machinery Research Institute | Li F.,Shanghai JiaoTong University | And 3 more authors.
MATEC Web of Conferences | Year: 2016

In this paper, the preparation and organization performance of thermal barrier coatings (TCBs) on the surface of titanium were studied experimentally. Nanostructured 8 wt% yttria partially stabilized zirconia coatings were deposited by air plasma spraying. The microstructure of nanostructured and the conventional coating was studied after laser remelting. It has shown that formed a network of micro-cracks and pits after laser remelting on nanostructured coatings. With the decrease of the laser scanning speed, mesh distribution of micro cracks was gradually thinning on nanostructured coatings. Compared with conventional ceramic layers, the mesh cracks of nanostructured coating is dense and the crack width is small. © The Authors, published by EDP Sciences, 2016.


Li T.,Shanghai JiaoTong University | Qin W.,Shanghai JiaoTong University | Zhang J.,Shanghai JiaoTong University | Li H.,Shanghai Aerospace Precision Machinery Research Institute | And 2 more authors.
Key Engineering Materials | Year: 2014

Manufacturing of complex products is a multi-resource coupling process, in order to achieve precise control of its manufacturing process, it should ensure that the manufacturing process information is get in real-time and accurately, achieving the real synchronization of logistics and information flow. Complex products manufacturing workshop represented with aerospace products have poor real-time production information, low production information integration and low visual production monitoring. In order to solve those problems, this paper constructs manufacturing process visualized real-time monitoring system, this system is able to reflect the real-time dynamic workshop production schedule information, quality testing information and abnormal production information and so on. Combined with assembly plant of an Aerospace institutes' actual production, this paper designs the architecture, functional structure as well as its business processes of the system, and proposes a metadata-based multi-source heterogeneous information integration technology, then, processes and integrates the collected production process information effectively and displays it through the station terminal, workshops signage. The system is able to share the workshop information resources effectively, and it has been successfully applied to the assembly plant, and has achieved good effect.


Yang X.,Shanghai JiaoTong University | Zhang J.,Shanghai JiaoTong University | Li H.,Shanghai Aerospace Precision Machinery Research Institute | Xu Z.,Shanghai Aerospace Precision Machinery Research Institute | Xiao H.,Shanghai Aerospace Precision Machinery Research Institute
Key Engineering Materials | Year: 2014

It is a big challenge faced by the enterprises that how to trace and manage the quality information of complex products effectively in the overall life circle. In this paper, two-dimensional code is regarded as a earner of quality infomiation,and statistical process control (SPC) is used to evaluate the production process and control the on-line quality.Quality tracing and management model is established which consists of three parts:the identification of parts by two-dimensional code.the real-time acquisition of process information and the quality managenient.The proposed model is validated and successfully implemented in a typical complex products manufacturer for quality tracing and management.


Gu J.,Shanghai University of Engineering Science | Wang D.,Shanghai University of Engineering Science | Xiao L.,Shanghai Aerospace Precision Machinery Research Institute | Li F.,Shanghai JiaoTong University | And 4 more authors.
Tezhong Zhuzao Ji Youse Hejin/Special Casting and Nonferrous Alloys | Year: 2016

The storage modulus and loss modulus of the wax during cooling process were measured by the advanced rheometric expansion system. The main modulus curves and wax relaxation time spectrum were calculated according to time-temperature equivalence principle. Finally, viscoelastic deformation of wax pattern during deposited process was predicted by using the finite element software Abaqus. © 2016, Journal Office of Special Casting and Nonferrous Alloys. All right reserved.


He X.,Shanghai JiaoTong University | He X.,Shanghai Aerospace Precision Machinery Research Institute | Guo G.,Shanghai JiaoTong University | Li K.,Shanghai JiaoTong University | Chen M.,Shanghai JiaoTong University
Key Engineering Materials | Year: 2016

Slender shaft is of high slenderness ratio and bad rigidity. The factors, for example, cutting force, cutting heat, vibration and so on, which are produced in the processing, will affect directly the size precision of workpieces. In this research, slender shaft is 304 stainless steel bar, with length of 450mm and diameter of 10mm. In order to resolve the problem of slender shaft machining with CNC slant bed lathe not configured with the follow-rest, a self-made follow-rest was developed. With both ends clamped processing mode, it is possible to use the CNC lathe turning slender shaft. Moreover, better effect of turning of slender shaft can be attained if ultrasonic vibration cutting technology is involved. After turning process is completed, size accuracy is checked to evaluate the effect of self-made follow-rest and both ends clamped processing mode. In this study, the experimental results show that quality of the slender shaft processing has been significantly improved with the use of self-made follow-rest and both ends clamped processing mode, which has definite effects on solving the practical problems of processing. © 2016 Trans Tech Publications, Switzerland.


Song J.B.,Shanghai JiaoTong University | Wang C.Y.,Shanghai JiaoTong University | Zan L.,Shanghai Aerospace Precision Machinery Research Institute | Chen M.,Shanghai JiaoTong University
Materials Science Forum | Year: 2014

Ultra-high strength steel 30Cr3SiNiMoVA is a typical difficult-to-cut material. During the machining process of 30Cr3SiNiMoVA, tool wear is an important factor which needs to be investigated seriously. In this work, one kind of CVD coated tools was used to investigate the tool wear mechanism of face milling of Ultra-high Strength Steel 30Cr3SiNiMoVA. Cutting forces during the wear process were measured with a kistler dyna-mometer. Surface roughness and tool wear evolution were determined. © (2014) Trans Tech Publications, Switzerland.


Chen X.,Shanghai Key Laboratory of Advanced High temperature Materials and Precision Forming | Chen X.,Shanghai Key Laboratory of Modem Metallurgy and Materials Processing | Xiao L.,Shanghai Aerospace Precision Machinery Research Institute | Yu J.,Shanghai Key Laboratory of Modem Metallurgy and Materials Processing | And 3 more authors.
Tezhong Zhuzao Ji Youse Hejin/Special Casting and Nonferrous Alloys | Year: 2016

Interface reactions between superalloys and the ceramic materials in investment casting were reviewed. The interface reaction between superalloy and ceramic materials is closely related with ceramic material kinds, alloy composition. SiO2 in ceramic materials and C,Cr,Al,Hf elements in superalloy are the key elements for interface reaction. The reaction products consist of Al2O3, Cr2O3 and HfO2, greatly affecting the quality of castings. The content of active elements should reach up to proper level to realize interface reaction. © 2016, Journal Office of Special Casting and Nonferrous Alloys. All right reserved.


Song J.B.,Shanghai JiaoTong University | Wang C.Y.,Shanghai JiaoTong University | Liu P.L.,Shanghai Aerospace Precision Machinery Research Institute | Zhan L.,Shanghai Aerospace Precision Machinery Research Institute | And 2 more authors.
Materials Science Forum | Year: 2014

Ultra-high strength steel 30Cr3SiNiMoVA has excellent mechanical properties, including high strength and hardness, a certain degree of ductility and toughness. The superior properties have awarded a wide application of 30Cr3SiNiMoVA in the aviation industry. But on the other hand, The ultra-high strength steel 30Cr3SiNiMoVA is a typically difficult-to-cut material, The difficult-to-cut features in the process of which include high cutting temperature and cutting force, severe tool wear, low productivity and so on. So selection of appropriate cutting parameters is very important in the process. In this paper, high-speed milling tests were carried out, to investigate the performance of 30Cr3SiNiMoVA under given conditions. Basing on the results of the experiments, Empirical formulas of surface roughness and cutting force were got. Finally, the multi-objective optimization on cutting parameters was conducted. The optimized parameters in the test conditions were ap=10mm, V=50/min, fz=0.06mm/z, aw=0.4mm. © (2014) Trans Tech Publicutions, Switzerland.


Wu W.,Shanghai University of Engineering Science | Xiao L.,Shanghai Aerospace Precision Machinery Research Institute | Wang D.,Shanghai University of Engineering Science
MATEC Web of Conferences | Year: 2016

A finite element method based model has been developed for magnesium alloy AZ31 tube bending process simulation, using the tensile (for bend outer radius) and compressive (for bend inner radius) properties of the AZ31 alloy at the bending temperature of 150°C. The results shown that very high compressive stresses are developed in the bend inner radius, limiting the minimum bend radius for the AZ31 tube. The simulation results suggest the minimum centerline bend radius to the tube outer diameter ratio is 1.5 to 2. The maximum diameter to thickness ratio is 30. © The Authors, published by EDP Sciences, 2016.

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