Turning Thermal Deformation Analysis of Aluminum Alloy Spherical Plain Bearing Outer Ring

2014 ◽  
Vol 556-562 ◽  
pp. 733-737
Author(s):  
Yan Jun Li ◽  
Bao Fu Li
Keyword(s):  
Aluminum Alloy ◽  
Element Model ◽  
Outer Ring ◽  
Deformation Analysis ◽  
Machining Accuracy ◽  
Plain Bearing ◽  
Axial Deformation ◽  
Machining Error ◽  
Deformation Law ◽  
Spherical Plain Bearing

Against the problem of large machining error and low productivity of aluminum alloy spherical plain bearing, the paper is concentrated on building finite element model in MATLAB to research the radial and axial deformation law under various cutting conditions with theories of heat transfer, isoparametric element and functional variational method, providing theoretical and data support to enhance machining accuracy of spherical plain bearing outer ring.

Turning Thermal Deformation Analysis of Aluminum Alloy Spherical Plain Bearing Outer Ring

2014 ◽  
Vol 543-547 ◽  
pp. 3904-3909
Author(s):  
Yan Jun Li ◽  
Bao Fu Li
Keyword(s):  
Aluminum Alloy ◽  
Element Model ◽  
Outer Ring ◽  
Deformation Analysis ◽  
Machining Accuracy ◽  
Plain Bearing ◽  
Axial Deformation ◽  
Machining Error ◽  
Deformation Law ◽  
Spherical Plain Bearing

Against the problem of large machining error and low productivity of aluminum alloy spherical plain bearing, the paper is concentrated on building finite element model in MATLAB to research the radial and axial deformation law under various cutting conditions with theories of heat transfer, isoparametric element and functional variational method, providing theoretical and data support to enhance machining accuracy of spherical plain bearing outer ring.

Investigation on surface morphology and tribological property generated by vibration assisted strengthening on aviation spherical plain bearings

2018 ◽  
Vol 233 (12) ◽  
pp. 4091-4101
Author(s):  
Zewei Yuan ◽  
Yue Qin ◽  
Kai Cheng ◽  
Wenzhen Zhao ◽  
Peng Zheng
Keyword(s):  
Surface Roughness ◽  
Surface Morphology ◽  
Tribological Properties ◽  
Synergistic Effects ◽  
Experimental Results ◽  
Distribution Model ◽  
Machining Accuracy ◽  
Plain Bearing ◽  
Surface Microhardness ◽  
Spherical Plain Bearing

The extreme and complex working conditions require aviation spherical plain bearings not only to have high machining accuracy and low surface roughness, but also to possess high surface microhardness and lubricant retaining capability. This paper presents a vibration assisted strengthening approach to achieving the synergistic effects of the surface property-improving and appearance-improving. The research attempts to answer how vibration assisted strengthening technique can improve the surface tribological properties of aviation spherical plain bearing components particularly in light of proposing the flat-headed asperity distribution model and the corresponding elastic–plastic contact modelling for the special processed surface morphology. Subsequently, the models are corroborated by the experimental results of characterizing the surface morphology produced by vibration assisted strengthening with different parameters such as rolling times and rolling static force. The surface tribological properties of spherical plain bearing specimens were studied by employing the UMT-TriboLab platform. The theoretical analysis and experimental results indicate that the surface asperities of spherical plain bearing components processed with repeated high frequency strikes present a flat-headed distribution but not Gauss distribution. It characterizes with a marked majority of produced small asperities with similar height, which is beneficial to frictional couple contacts and a lot of original valleys retaining lubricants. The processing technique contributes to increasing the surface microhardness by 20% and decreasing the surface roughness from about Ra 0.4 µm to below Ra 0.1 µm. The ball-on-flat friction tests demonstrate that both the special flat-headed surface structure and the elevated microhardness can attribute the improvement of tribological properties and wear resistance performance of spherical plain bearings.

The Application of FEM Technology on the Deformation Analysis of the Aero Thin-Walled Frame Shape Workpiece

2006 ◽  
Vol 315-316 ◽  
pp. 174-179 ◽  
Author(s):  
H. Guo ◽  
Dun Wen Zuo ◽  
S.H. Wang ◽  
Min Wang ◽  
L.L. Xu ◽  
...  
Keyword(s):  
Complex Structure ◽  
Element Model ◽  
Deformation Analysis ◽  
Machining Accuracy ◽  
National Defense ◽  
Residual Stress Field ◽  
Machining Deformation ◽  
Thin Walled ◽  
And Control ◽  
Milling Forces

Many thin-walled structure components widely used in aero industries not only have complex structure and large size, but also need high machining accuracy. However, because of their poor rigidity, it is easy to bring machining deformation caused by the existence of the initial residual stresses, the fixing stresses, cutting forces and cutting heat. The difficulty in ensuring their machining accuracy becomes a big problem, so that how to effectively predict and control the machining deformation has become an important subject in the development and production of our national defense weapons. This paper established a 3-D Finite element model with consideration of milling forces, clamping forces and initial residual stress field. By using this model, machining deformation of thin-walled frame shape workpieces has been computed. The simulated results are compared with experimental data, and the correctness of the simulation is verified. The study is helpful to the prediction and the control of machining deformation for thin-walled parts.

Experiment Study on Deflection of Aluminum Alloy Thin-Wall Workpiece in Milling Process

2011 ◽  
Vol 697-698 ◽  
pp. 129-132 ◽  
Author(s):  
Bing Han ◽  
Cheng Zu Ren ◽  
X.Y. Yang ◽  
Guang Chen
Keyword(s):  
Aluminum Alloy ◽  
Coordinate Measuring Machine ◽  
Milling Process ◽  
Cnc Machining ◽  
Machining Accuracy ◽  
Thin Wall ◽  
Machining Center ◽  
Machining Errors ◽  
Alloy Material ◽  
Measuring Machine

The deflection of Aluminum alloy thin-wall workpiece caused by the milling force leads to additional machining errors and reduces machining accuracy. In this paper, a set of experiments of milling thin-wall workpiece were carried out to study the deflection of thin-wall workpiece. The workpieces, with different types of material and different thicknesses, were machined on CNC machining center. The deflections of workpiece were measured by a three-coordinate measuring machine. Effects of Aluminum alloy material and thickness on deflection are discussed based on the experimental data.

Numerical analysis of soil deformation behind the reaction wall of an open caisson induced by horizontal parallel pipe-jacking construction

2015 ◽  
Vol 52 (12) ◽  
pp. 2008-2016 ◽  
Author(s):  
Yang Sun ◽  
Jing-bo Su ◽  
Xiao-he Xia ◽  
Zheng-liang Xu
Keyword(s):  
Reaction Force ◽  
Soil Surface ◽  
Horizontal Displacement ◽  
Element Model ◽  
Deformation Analysis ◽  
Burial Depth ◽  
Maximum Displacement ◽  
Obvious Effect ◽  
Simple Loading ◽  
Pipe Jacking

The disturbance of the soil behind the reaction wall of an open caisson can affect the efficiency and safety of jacking operation and control. This study focuses on the deformation of the soil mass behind the reaction wall used to support the jack. The stress–strain relationship of the soil behind the reaction wall was analysed, providing a theoretical basis for determining the most unfavourable combination of reactive forces using a computational model. A three-dimensional finite element model for this problem was developed, and a simple loading scenario was implemented. In addition, the mechanism of the deformation of the soil induced by horizontal parallel pipe jacking was also analysed. The results showed that for the soil behind the reaction wall of the open caisson, the uplift deformation of the soil surface increased initially and later gradually decreased, eventually achieving stability. The reaction force had a relatively obvious effect on the deformation of the soil within the range of the reaction wall burial depth and the horizontal displacement of the soil along the length of the reaction wall. The maximum displacement occurred near the axis of symmetry of the reaction wall. In addition, to consider the cyclic characteristics of the reaction force, the shakedown theorem is introduced to the deformation analysis of the soil and compared with the results obtained from simple loading. It was shown that the two deformation analysis methods have certain scopes of application, depending on the individual engineering requirements.

Optimal Clamping Scheme of Thin-Walled Cavity Workpiece

2011 ◽  
Vol 189-193 ◽  
pp. 2116-2120
Author(s):  
Shi Min Geng ◽  
Jun Wang
Keyword(s):  
Finite Element ◽  
Aluminum Alloy ◽  
Machining Process ◽  
Machining Accuracy ◽  
Finite Element Models ◽  
Thin Walled ◽  
Clamping Sequence

The thin-walled cavity workpiece with insufficient rigid property is liable to deform during the machining process and the request of accuracy is very strict. The paper takes typical aeronautic aluminum-alloy for example, fixture is an important consideration in the operation. To reveal the influences of locating points, clamping sequence and loading ways on the distortion of thin-walled cavity part, finite element models were established to simulate the clamping operation. The result shows the preferable scheme is that the distance of the clamping locations are far each other, clamping forces are firstly applied on the surface with high rigid and all clamping forces are applied in many steps. The scheme can effectively control the deformation of clamp ,and furthermore improve the machining accuracy.

Strength Analysis for Composite Windshield of Commercial Aircraft

2014 ◽  
Vol 1030-1032 ◽  
pp. 1010-1013
Author(s):  
Ya Xiong Du ◽  
Shu Li ◽  
Kai Guo
Keyword(s):  
Finite Element ◽  
Aluminum Alloy ◽  
Rational Design ◽  
Element Model ◽  
Strength Analysis ◽  
Commercial Aircraft ◽  
Load Pressure ◽  
Full Size ◽  
Advanced Composites ◽  
The Finite Element Model

With the development of advanced composites technology, composites instead of traditional aluminum alloy, will be widely used to build full-size aircraft windshield structure in the aviation field. The finite element model of commercial aircraft composite windshield is established in the environment of Msc.Patran / Nastran. And based on Tasi-Wu failure criterion, the strength of windshield structure under typical load pressure is predicted and analyzed during failure processes. It shows that composite windshield can work better through rational design according to the analysis result.

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