The Experts below are selected from a list of 3387 Experts worldwide ranked by ideXlab platform
Feng Feng - One of the best experts on this subject based on the ideXlab platform.
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Two-dimensional and three-dimensional ®nite element models of External Thread rolling
2016Co-Authors: Joseph P Domblesky, Feng FengAbstract:Abstract: In the present study, the DEFORM computer code was used to develop two-dimensional and three-dimensional ®nite element models for simulating External Thread rolling. To simulate rolling in two dimensions, a plane strain model was used where the Thread is assumed to form through progressive penetration of the blank surface using a parallel set of wedge-shaped indenters. To develop the three-dimensional model, a ¯at-die rolling process was simulated which incorporated blank rotation, die movement and pitch angle on the die faces. Based on a comparison of Thread form and microhardness with as-rolled Threads, the plane strain model was found to provide a reasonable approximation of Thread-rolling behaviour. Results obtained from the initial pass of the three-dimensional model are promising although progress is currently limited by the excessive computational time needed, frequency of remeshing and sliding at the die±blank interface
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two dimensional and three dimensional finite element models of External Thread rolling
Proceedings of the Institution of Mechanical Engineers Part B: Journal of Engineering Manufacture, 2002Co-Authors: Joseph P Domblesky, Feng FengAbstract:AbstractIn the present study, the DEFORM computer code was used to develop two-dimensional and three-dimensional finite element models for simulating External Thread rolling. To simulate rolling in two dimensions, a plane strain model was used where the Thread is assumed to form through progressive penetration of the blank surface using a parallel set of wedge-shaped indenters. To develop the three-dimensional model, a flat-die rolling process was simulated which incorporated blank rotation, die movement and pitch angle on the die faces. Based on a comparison of Thread form and microhardness with as-rolled Threads, the plane strain model was found to provide a reasonable approximation of Thread-rolling behaviour. Results obtained from the initial pass of the three-dimensional model are promising although progress is currently limited by the excessive computational time needed, frequency of remeshing and sliding at the die-blank interface.
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a parametric study of process parameters in External Thread rolling
Journal of Materials Processing Technology, 2002Co-Authors: Joseph P Domblesky, Feng FengAbstract:Abstract This paper summarizes the results of a numerical study conducted to analyze the effect of selected process parameters on material flow and Thread profile in External Thread rolling of large diameter blanks. Based on the previous work where a plane strain model was found to provide a reasonable approximation of the Thread rolling process, the effect of varying Thread form, friction factor, flow stress, and blank diameter on effective strain and Thread height was analyzed using the finite element code DEFORM. The results of the study show that for the range of conditions considered, that blank diameter had little effect on the as-rolled Thread while flow stress (K and n), friction factor, and Thread form all had significant impact on effective strain at the Thread root and crest and the achievable Thread height. While the rate of work hardening was found to have an effect on the crest profile, the results indicate that it is not the primary factor responsible for seam formation in rolled Threads.
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Numerical Modeling of the External Thread Rolling Process
e-Publications@Marquette, 1999Co-Authors: Feng FengAbstract:External Threaded fasteners manufactured by the Thread rolling process are applied in many commercial and military applications due to their superior properties. However, the process design for Thread rolling is still primarily based on empiricism and experience. This approach is very inefficient and expensive. A more scientifically based methodology to predict the process response and product properties prior to Thread rolling is desired. Numerical simulation and modeling of the Thread rolling process, based on knowledge of underlying process physics and validated by experimental results, is a powerful tool for optimizing process parameters. At this time, few studies related to numerical simulation of the Thread rolling process have been published in the literature. In this thesis, a numerically based 2D model for the Thread rolling process will be established and validated. The relationships between process parameters and effective strain, load and Thread profile obtained from the results of the 2D numerical simulation for the Thread rolling process will be presented. In addition, a preliminary 3D model for flat-die Thread rolling will also be presented. The 2D process model and validation results are presented in Chapter 3. The effect of the Thread rolling process parameters on metal flow, effective strain and rolling load from the 2D numerical simulation results are discussed in Chapter 4. The 3D modeling of the process is described in Chapter 5. Suggestions for future work and a summary of the results are presented in Chapter 6
Joseph P Domblesky - One of the best experts on this subject based on the ideXlab platform.
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Two-dimensional and three-dimensional ®nite element models of External Thread rolling
2016Co-Authors: Joseph P Domblesky, Feng FengAbstract:Abstract: In the present study, the DEFORM computer code was used to develop two-dimensional and three-dimensional ®nite element models for simulating External Thread rolling. To simulate rolling in two dimensions, a plane strain model was used where the Thread is assumed to form through progressive penetration of the blank surface using a parallel set of wedge-shaped indenters. To develop the three-dimensional model, a ¯at-die rolling process was simulated which incorporated blank rotation, die movement and pitch angle on the die faces. Based on a comparison of Thread form and microhardness with as-rolled Threads, the plane strain model was found to provide a reasonable approximation of Thread-rolling behaviour. Results obtained from the initial pass of the three-dimensional model are promising although progress is currently limited by the excessive computational time needed, frequency of remeshing and sliding at the die±blank interface
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two dimensional and three dimensional finite element models of External Thread rolling
Proceedings of the Institution of Mechanical Engineers Part B: Journal of Engineering Manufacture, 2002Co-Authors: Joseph P Domblesky, Feng FengAbstract:AbstractIn the present study, the DEFORM computer code was used to develop two-dimensional and three-dimensional finite element models for simulating External Thread rolling. To simulate rolling in two dimensions, a plane strain model was used where the Thread is assumed to form through progressive penetration of the blank surface using a parallel set of wedge-shaped indenters. To develop the three-dimensional model, a flat-die rolling process was simulated which incorporated blank rotation, die movement and pitch angle on the die faces. Based on a comparison of Thread form and microhardness with as-rolled Threads, the plane strain model was found to provide a reasonable approximation of Thread-rolling behaviour. Results obtained from the initial pass of the three-dimensional model are promising although progress is currently limited by the excessive computational time needed, frequency of remeshing and sliding at the die-blank interface.
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a parametric study of process parameters in External Thread rolling
Journal of Materials Processing Technology, 2002Co-Authors: Joseph P Domblesky, Feng FengAbstract:Abstract This paper summarizes the results of a numerical study conducted to analyze the effect of selected process parameters on material flow and Thread profile in External Thread rolling of large diameter blanks. Based on the previous work where a plane strain model was found to provide a reasonable approximation of the Thread rolling process, the effect of varying Thread form, friction factor, flow stress, and blank diameter on effective strain and Thread height was analyzed using the finite element code DEFORM. The results of the study show that for the range of conditions considered, that blank diameter had little effect on the as-rolled Thread while flow stress (K and n), friction factor, and Thread form all had significant impact on effective strain at the Thread root and crest and the achievable Thread height. While the rate of work hardening was found to have an effect on the crest profile, the results indicate that it is not the primary factor responsible for seam formation in rolled Threads.
Martin Zollmann - One of the best experts on this subject based on the ideXlab platform.
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central locking element for fastening component on carrier particularly on hub hub adapter or drive shaft has positive locking unit for engaging tool for actuating central locking element where positive locking unit has clamping element
2014Co-Authors: Martin ZollmannAbstract:The central locking element (10) has an internal Thread for mounting the central locking element on an External Thread of the carrier, and a positive locking unit (11) for engaging a tool for actuating the central locking element. The positive locking unit has a clamping element (16), which is formed by a partially undercut profile, and an inclined surface (19). The positive locking units are cams, which protrude in the axial direction.
Toshio Fukuda - One of the best experts on this subject based on the ideXlab platform.
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Fault detection algorithm for External Thread fastening by robotic manipulator using linear support vector machine classifier
2013 IEEE International Conference on Robotics and Automation, 2013Co-Authors: Takayuki Matsuno, Jian Huang, Toshio FukudaAbstract:Fault detection functions with learning method of a robotic manipulator are very useful for factory automation. All production has the possibility to fail due to unexpected accidents. To reduce the fatigue of human workers, small errors automatically should be corrected by a robot system. Also a learning method is important for fault detection, because labor of system integrator should be reduced. In this paper, an External Thread fastening task by a robotic manipulator is investigated. To discriminate the four states of a task, linear support vector machine methods with two feature parameters are introduced. The effectiveness of the proposed algorithm is confirmed through an experiment and recognition examination. Finally, the ability of linear SVM is compared with artificial neural network method.
Tae Seok Seo - One of the best experts on this subject based on the ideXlab platform.
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a 3d printed screw and nut based droplet generator with facile and precise droplet size controllability
Sensors and Actuators B-chemical, 2019Co-Authors: Hau Van Nguyen, Huynh Quoc Nguyen, Van Dan Nguyen, Tae Seok SeoAbstract:Abstract Herein, we present the fabrication of a novel vertical T-junction based droplet generator using a desktop 3D printer and the production of a variety of size of polymer particles by tuning the vertical T-junction gap height (hg) with ease. The droplet generator device consists of two main components: an internal Thread nut with a vertical T-junction droplet generator unit, and a screw with an External Thread for adjusting hg. The two components were fabricated by a 3D printer and assembled simply by a bolt-and-nut combination. The clockwise or counter-clockwise rotation of the screw is converted into the downward and upward linear motion of the screw, adjusting the hg value. The hg value can be tuned precisely from 0 to 750 μm by designing 75 control teeth on the top of the screw. The size of the produced droplets is proportional to the hg value. The size range of the droplets was 39–1404 μm, when hg changed from 20 to 200 μm. We synthesized poly(ethylene glycol) diacrylate (PEGDA) particles using the droplet as a reactor, and accordingly the PEGDA particle size could be controlled. Our proposed 3D printed droplet generator is rapid, simple and cost-effective to be fabricated without need of lithographic processes.
