Academic literature on the topic 'Straightening process'

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Journal articles on the topic "Straightening process"

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Gui, Hai-Lian, Qiang Li, and Qing-Xue Huang. "The Influence of Bauschinger Effect in Straightening Process." Mathematical Problems in Engineering 2015 (2015): 1–5. http://dx.doi.org/10.1155/2015/612840.

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The yield stress changes during the straightening process, because of the Bauschinger effect. This effect leads to a different reduction rate in each straightening roller. To accurately estimate the straightening effect of the rolled piece, the Bauschinger effect must be considered in calculating the reduction rate. In this paper, the straightening model is described by the fast multipole boundary element method. The Bauschinger effect model is discussed in the elastic loading region and elastic plastic loading region. Young’s modulus reduction and the reverse yield stress reduction are obtained for the straightening force model. The straightening force formula including the Bauschinger effect is determined by analyzing the tension and compression processes. This formula reflects the changes of the yield stress and the straightening force in the tension and compression processes. It is concluded that the Bauschinger effect is a very important factor for the precise estimation of the straightening force.
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Feng, Jian Chao, Ming He Chen, Chao Zhang, and Li Ming Guo. "Research on TC4 Alloy Wire Rod Straightening Process." Materials Science Forum 747-748 (February 2013): 850–54. http://dx.doi.org/10.4028/www.scientific.net/msf.747-748.850.

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Titanium alloy are widely used in various fields, such as Aerospace, Marine and Medical. However, the technology of straightening for TC4 wire rod has not been effectively solved, and relevant research is quite rare. TC4 wire rod is difficult to be straightened under room temperature owing to its special properties. In order to solve this problem, this paper designed a parallel roll thermal straightening system and also developed an automatic intermesh calculation software based on Matlab GUI platform to precalculate the settings of straightening device under different temperatures according to straightening theory. Furthermore, numerical simulation method has been used for straightening process with ABAQUS software before the practical straightening experiment. Finally, using the calculated parameters the straightening experiment was carried out, and results show that this method is feasible and effective.
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Tian, Ya Qin, Qing Xue Huang, and Jin Bao Li. "Numerical Analysis of Pressure Straightening Process to High Pressure Boiler Tube." Applied Mechanics and Materials 37-38 (November 2010): 723–26. http://dx.doi.org/10.4028/www.scientific.net/amm.37-38.723.

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The biggest straightening force is one of the important parameters and has an important influence to straightening effect in the straightening process. In this paper, the numerical experiment of loading counterweight force was carried out by finite element analysis software in the steel tube bending. In bending straightening process of numerical calculation, two kinds of steel tube were selected, the size being Φ720mm, δ120mm and Φ325mm, δ55mm, respectively. The straightening force variation law of bending steel pipe was obtained under the plastic state trends in the straightening process. The best control parameters of steel pipe straightening have been identified for the steel pressure straightening and provide a theoretical basis for parameter determination.
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Zhu, Xiaoyu, Peisheng Han, Xiaoxiao Liu, and XiaoGang Wang. "Optimization Model of Process Parameters for Full-Plate Long-Roll Straightening considering Equipment Bounce." Mathematical Problems in Engineering 2021 (February 17, 2021): 1–9. http://dx.doi.org/10.1155/2021/6647769.

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Roll straightening is an important process link in sheet production. Due to the step change of the straightening force during the straightening bite and the tail flick, the whole-plate length straightening and pressing process changes will affect the straightening effect. Based on the solution of the curvature integral straightening process, this paper introduces the stiffness coefficient of the straightening equipment. Through C language programming, the iterative solution has been realized, and the process parameters of the dynamic change of the straightening reduction have been obtained. The enumeration method was used to establish a calculation method to optimize the entire board-length straightening process. The laboratory comparison of the 11-roll straightening machine proves that the straightening process optimization model meets the application requirements.
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Chen, Qiang, Shan Li, Ying Luo, and Wen Long Lu. "Parameters Research of Precise Straightening Process in Roll Straightener." Advanced Materials Research 1095 (March 2015): 800–803. http://dx.doi.org/10.4028/www.scientific.net/amr.1095.800.

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Refined copper to obtain high quality can use the electrolytic method; the copper cathode plate is applied to the electrochemical machining. In order to make copper cathode plate has high flatness, assuring electrolytic cell cathode and anode plate spacing, so that the purity of copper electrolysis precipitation is higher, so change the straightening plate method has become the urgent task of the enterprise. Through the computer simulation, the ANSYS/LS-DYNA computer optimization, analysis precise straightening device parameters, in ensuring the copper starting sheet straightening can meet basic factories requirements, improve the machining precise straightening machine and copper starting sheet straightening efficiency.
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Li, Jun, and Guo Liang Xiong. "Study on Calculation Method of Press Straightening Stroke Based on Straightening Process Model." Key Engineering Materials 340-341 (June 2007): 1345–50. http://dx.doi.org/10.4028/www.scientific.net/kem.340-341.1345.

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It is difficult to determine straightening stroke precisely for automatic straightening machines. The existing calculation method of straightening stroke is based on straightening curvature equation. Because the initial curvature is obtained by curve fitting method, the method is inconvenient to use and its accuracy is not well. In this paper, a method to calculate straightening stroke based on straightening process model is put forward. So the mathematic load-deflection model of straightening process must be established at first. The straightening process model for shafts is developed according to the elastic-plastic mechanics theory. By using the model, the straightening stroke can be calculated directly according to the initial deflection of the bent part. It is advantageous to use and to decrease errors. Comparing with FEM results and experimental results, the calculation results by the model are exact and the errors are small. So the validity and the accuracy of the method are verified. It will be helpful to the development of automatic straightening machines.
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Kim, Woong-Kyum, Nam-Pyo Hong, Byeong-Hee Kim, and Heon-Young Kim. "Straightening Process of Micro Wires." Transactions of the Korean Society of Mechanical Engineers A 30, no. 9 (September 1, 2006): 1148–53. http://dx.doi.org/10.3795/ksme-a.2006.30.9.1148.

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He-Rong, Jin, Yi Ya-Li, Han Xue-Yan, and Liang Yan. "Roller Straightening Process and FEM Simulation for Stainless Steel Clad Plate." Open Mechanical Engineering Journal 8, no. 1 (December 31, 2014): 557–61. http://dx.doi.org/10.2174/1874155x01408010557.

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Based on elasto-plastic deformation straightening theory and by adopting 11 rolls straightening plates , the isothermal residual curvature straightening process was proposed for stainless steel clad plate. The mathematical model of straightening was established to realize plate shape finishing and stress reforming. By using finite element analysis software, establishing straightening process and determining intermesh, the effects of intermesh on shape and residual stress were analyzed. The results indicate that the straightening process met the finishing plainness of stainless steel clad plate after rolling. Longitudinal residual stress of the clad plate was evenly distributed across width. The cladding plate and steel substrate were observed to be symmetrical and the ascent of stress near the edge was greater. Longitudinal residual stress across length was distributed with the wave of pull-press-pull and the cladding plate and base plate were observed to be symmetrical. The above researches are based on the previous theory of the application of stainless steel clad plate straightening technology.
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Návrat, Tomas, and Jindrich Petruška. "Eulerian Description of Rail Straightening Process." Applied Mechanics and Materials 624 (August 2014): 213–17. http://dx.doi.org/10.4028/www.scientific.net/amm.624.213.

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The paper deals with numerical analysis of the process of roller straightening of rails. The problem of repeated elasto-plastic bending is solved by a program in MATLAB based on FEM algorithm with Eulerian description of material flow through the straightening machine. Beam element formulation with a shear deformation effect is used for the rail discretization. The results are compared with literature and standard FE analysis with Lagrangian description of material flow. Effectiveness of presented formulation is discussed and its applicability for fast iterative optimization of the straightening process is illustrated.
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Das Talukder, N. K., and A. N. Singh. "Mechanics of Bar Straightening, Part 1: General Analysis of Straightening Process." Journal of Engineering for Industry 113, no. 2 (May 1, 1991): 224–27. http://dx.doi.org/10.1115/1.2899682.

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Dissertations / Theses on the topic "Straightening process"

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Čupr, Pavel. "Výpočtová simulace rovnání tyčí nekruhového průřezu." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-232107.

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The purpose of this study is to compare two possible methods of computational modeling of straightening long profiles. The study presents fundamentals of the straightening process, basic principles of the finite element method and the principle of fast algorithm based on Eulerian description of motion of continuum. The study investigates how the two methods are computationally demanding and precise. Finally, the acquired results are summarised and the effectiveness of both algorithms is assessed.
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Ščerba, Bořek. "Vliv nastavení a konfigurace rovnačky na výsledky simulace kosoúhlého rovnání." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2020. http://www.nusl.cz/ntk/nusl-418209.

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Analytical methods or implicit finite element method (FEM) with beam elements to model straightened bar were used to analyze straightening process in multi-staggered cross-roll straighteners up to now. These are effective but require certain simplifications. Aim of this thesis is to create an explicit FEM model allowing usage of solid elements for circular bar without disproportional increase of computational time. This may lead to deeper understanding of the straightening process. The model is to be verified using straightening tables and then used to quantify influence of rollers configuration on results of the straightening process.
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Santos, Christian Correa dos. "Influência de parâmetros de processo no empenamento de barras trefiladas do aço SAE 9254." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2008. http://hdl.handle.net/10183/21257.

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Existem muitas aplicações em engenharia onde são requisitados materiais que apresentem boas propriedades mecânicas tais como, resistência mecânica, alto limite de escoamento, dureza, aliado ao atendimento às necessidades do cliente. Dentro deste contexto, foi realizado um trabalho focado em processo de trefilação combinada, utilizando como método a produção de barras a partir de rolo de fio-máquina. A trefilação combinada consiste nas etapas de pré-endireitamento com múltiplos rolos, jateamento, trefilação, corte e endireitamento com dois rolos, tendo como produto final barras acabadas trefiladas. Este trabalho teve por objetivo otimizar o processo de trefilação de aço SAE 9254 (aço mola) visando à redução da variabilidade do empenamento, bem como atender os níveis de especificação para diversos clientes. Esta qualidade de aço é empregada na fabricação de molas de suspensão para indústria automotiva e agrícola, onde estas, com seus processos de manufatura, agregam ao produto propriedades específicas (por exemplo, dureza e resistência a tração) para o seu uso. Inicialmente foi realizada uma revisão dos principais fundamentos e conceitos metalúrgicos referentes aos mecanismos de empenamento e endireitamento dos aços, bem como a influência de cada uma das variáveis de processo em questão nas propriedades finais do produto com foco no empenamento. Nesta dissertação foram avaliadas as inter-relações existentes no processo de trefilação, dentre os quais velocidade de trefilação, geometria de fieira (semi-ângulo da fieira), pressão de endireitamento e ângulo de endireitamento, utilizados na trefila. Foi realizada a caracterização mecânica e metalúrgica do aço base, produto laminado e trefilado nas bitolas 12,5 mm e 14,03 mm. Os resultados obtidos permitiram melhorar os níveis de empenamento inicialmente encontrados, fazendo mudanças nos parâmetros de processo e otimizando a trefilação desta qualidade de aço mola. Foram determinados valores limites para as variáveis críticas de processo estudadas, atendendo assim a qualidade exigida pelo cliente desde que as mesmas sejam respeitadas.
There are many applications in engineering in which materials with good mechanical properties are required such as, tensile strength, tension yield, toughness, together with supplying the client's needs. Focusing on this, a research was conducted focused on searching on ways on how to better the quality of the product as well as serving the client's specifications. The combined drawing process consists of pre-straightening, shot peening, drawing, cutting and two roll straightening of coils to produce bars. The objective of this paper is to optimize the cold drawn process of steel grade SAE 9254 (spring steel) aiming the variability reduction of the straightening, as well as serve the levels of specifications for various clients. This quality of steel is used in the manufacturing of suspension springs for the automotive and agricultural industries, whereas with their manufacturing processes aggregate to the product specific properties (for example, toughness and tensile strength) for its uses. Initially, a review of the main fundaments and the metallurgical concepts referring to the straightening and straightening mechanisms of the steel was realized. As weel as the influence of each process variable existing in the final property of the product focusing on straightness. In this text, the existing relations in the cold drawn process were compiled, such as the speed of cold drawn, die semi-angle, the straightening pressure and angle, used in the cold drawn. The mechanical properties and metal characterization of the base steel was made, rolling product and cold drawing in the 12,5mm and 14,03mm gauges. The obtained results allowed us to improve the initially found levels of straightening, applying changes to the process parameter and optimizing the cold drawn of the quality of this spring steel. Limit values were checked for the critical variable of process that were studied, and so attending the quality demanded by the client as long as the same are respected.
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Hluška, Milan. "Využití rychlého algoritmu kosoúhlého rovnání k optimalizaci procesu rovnání pomocí neuronových sítí." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2020. http://www.nusl.cz/ntk/nusl-418190.

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Master's thesis deals with a fast cross roll bar straightening algorithm and its modifications to allow for an automatic calculation of a large number of simulations and an arbitrary straightening machine configuration. Modified program is then verified using the original algorithm. It also deals with the algorithm's application to straightening process optimization using neural networks.
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Tseng, Ching-Hung, and 曾清宏. "The FEM Study on the Tension and Force of Sheet Metal in the Straightening Process." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/86448072864367884631.

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碩士
雲林科技大學
機械工程系碩士班
98
This thesis investigates the deformation of the metal strips in the roll-straightening processes, using the explicit dynamic finite element software ANSYS/LS-DYNA. Based on a simplified elasto-plastic mechanics, twelve bench tests are designed to investigate the tension per unit width of metal strip and the total straightening force acting on the working rollers. In addition to the finite element analysis, the theoretical solutions of the tension per unit width and the straightening force have also been developed. Both the numerical and theoretical results show that the tension per unit width is proportional to the strip thickness and the discrepancies between these two approaches are within 10 percents. The optimal case with discrepancy below 5 percents takes place when the strip undergoes more significant bending. As for the total straightening force, it is found to be proportional to the strip width and square of the strip thickness. The theoretical forces are usually greater than the numerical ones. The modification for the strip of 6 mm thickness ranges from 2 to 17 percents and lies between 3 to 20 percents for the 3 mm strip.
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Book chapters on the topic "Straightening process"

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Li, Jun, and Guo Liang Xiong. "Study on Calculation Method of Press Straightening Stroke Based on Straightening Process Model." In Engineering Plasticity and Its Applications, 1345–50. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-433-2.1345.

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Thiel, S., and W. Lux. "Controlled Deformation — a Process to Increase Quality of Automated Adjustment and Straightening." In Toward the Factory of the Future, 213–18. Berlin, Heidelberg: Springer Berlin Heidelberg, 1985. http://dx.doi.org/10.1007/978-3-642-82580-4_38.

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An-chao, Ren, Ji Yu, and Zhu Min. "Analysis of the Welded 100-Meter Heavy Rails for Passenger Dedicated Lines Being Broken During the Straightening Process." In Characterization of Minerals, Metals, and Materials 2013, 11–19. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118659045.ch2.

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"Straightening and Leveling for Strip-Shape Control." In Handbook of Metalforming Processes, 275–80. CRC Press, 1999. http://dx.doi.org/10.1201/b15231-20.

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Conference papers on the topic "Straightening process"

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Lian, Yang, Hong Lu, Mingtian Ma, Jianying He, Qiong Liu, Qian Cheng, and Yu Qiao. "Straightening Process of Straight Metal Pipe Considering the Flattening Effect." In ASME 2019 14th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/msec2019-2828.

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Abstract Straight metal pipes are widely used in petroleum exploration and transmission equipment systems. Straightening is one of effective methods for ensuring or repairing the bending during straight metal pipe rolling, heat treatment, assembly and operational application. However, the flatten phenomenon of straight metal pipe during straightening process is unavoidable. Therefore, it is significant to study the flatten phenomenon of straight metal pipe in straightening process. Based on the theory of elastoplastic deformation, the flatten phenomenon of straight metal pipe is analyzed. Further, the straightening stroke model of straight metal pipe for guiding the straighten operation is established. Afterwards, the theoretical straightening stroke model is analyzed on the basis of simulation. Finally, the experimental system was built up. A series of related experiments were carried out to verify the rationality of the model.
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Chen, Qiang, Shan Li, Ying Luo, and Wenlong Lu. "Parameters Study on Precise Straightening Process in Roll Straightener." In 2016 3rd International Conference on Mechatronics and Information Technology. Paris, France: Atlantis Press, 2016. http://dx.doi.org/10.2991/icmit-16.2016.99.

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Scholler, S., J. Marks, M. Harbison, L. Kvidahl, and T. D. Huang. "Shipboard Fairing Process Improvement and Testing." In SNAME 5th World Maritime Technology Conference. SNAME, 2015. http://dx.doi.org/10.5957/wmtc-2015-280.

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The flame straightening process has been developed since 1940; however, the process at Ingalls Shipbuilding (Ingalls) was loosely controlled with the majority of procedural steps governed by the flame straightener performing the operation. Findings from initial research showed excessive heat, both in the size and temperature of the heat spots as well as the quantity of spots used to achieve flatness. The amount of heat involved drastically increased paint rework, delayed schedules, and affected the surrounding structural members causing crippled structures that must be cut out and replaced. Between operators or applications, the process also varied greatly which provided no measureable work scope and led to the tendency of the straighteners to apply far more heat than necessary to achieve panel flatness tolerances. The Ingalls research team executed tasking that analyzed the current flame straightening process, quantified issues associated with overheating, tested a variety of different straightening patterns, and ultimately implemented a revised procedure. The new, more efficient procedure reduces the amount of heat spots required to achieve flatness tolerance with and thus decreases the process cost, minimizes heat input, and prevents damage caused by past practices.
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Jin, Herong, Xukun Yang, and Xueyan Han. "Research on Roller Straightening Process for Stainless Steel Clad Plate." In 2015 International conference on Applied Science and Engineering Innovation. Paris, France: Atlantis Press, 2015. http://dx.doi.org/10.2991/asei-15.2015.358.

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Hong, Lu, and Xiao Xiong. "Research on straightening process model based on iteration and self-learning." In 2016 IEEE 11th Conference on Industrial Electronics and Applications (ICIEA). IEEE, 2016. http://dx.doi.org/10.1109/iciea.2016.7603995.

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KIM, TAE WON, MYOUNG GYU LEE, HYUNG-IL MOON, HYUNG JONG KIM, and HEON YOUNG KIM. "PREDICTION OF THE RESIDUAL STRESS IN THE PROCESS OF STRAIGHTENING WIRE." In Proceedings of the 9th AEPA2008. WORLD SCIENTIFIC, 2009. http://dx.doi.org/10.1142/9789814261579_0103.

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Guo, Zexing, Hong Lu, Jinglin Zhang, Yue Zang, Weixin Zhang, Jianying He, and Qiong Liu. "Improvement on Straightness of Micro-Motor Shaft Considering Stress Concentration Caused by the Grooves." In ASME 2019 14th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/msec2019-2826.

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Abstract Motor shaft is one of the most important parts of motor, which is widely used in industrial field. The straightness of the shaft has a potentially significant effect on motor performance, which is determined by the straightening process in the manufacturing process of the shaft. Considering the grooved characteristics on the micro-motor shaft and using the classical material mechanics principle, the stress and deformation models of the circular shaft with the grooves during the straightening process are established in this paper. By deriving the straighttening stroke-initial deflection model, an accurate and practical relationship between the straightening stroke and the initial deflection was provided. In order to verify the theoretical straightening model, some grooved shaft specimens are designed and manufactured for the straightening experiments. Through the simulation and experimental research, the straightening stroke-initial deflection model for the micro-motor shaft is compared and analyzed, and the correctness and feasibility of the model is verified.
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Zhang, Yongquan, Hong Lu, Wei Fan, Shaojun Wang, Qinyu Wei, and He Ling. "The Pressure Straightening Technology of Linear Guide Rails Using Dual Indenter-Dual Clamp System." In ASME 2017 12th International Manufacturing Science and Engineering Conference collocated with the JSME/ASME 2017 6th International Conference on Materials and Processing. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/msec2017-2699.

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To improve the compressive capacity and straightening efficiency of straightening process, the stroke-deflection model (SDM) using dual indenter and dual clamp system (DIDCS) for linear guide rails is developed in this paper. The DIDCS is actually simplified as a symmetrically supported beam with two symmetrical concentrated forces on the top surface of workpiece, so the straightening process is regarded as pure bending process. To explore the deflection variation during the whole process with DIDCS, the curvature-deflection model (CDM) considering the span control of dual indenter and dual clamp is firstly analyzed based on elastic-plastic deformation theory and small deformation principle. The geometrical features and material properties of linear guide rails, which are the main factors influencing bending characteristics, are then mathematically modeled for the further analysis of stress and strain distributions in straightening process. Besides, to obtain the actual bending moment model (BMM) of different model parameters, the distribution regulations of elastic and plastic regions are analyzed followed by pure bending assumptions. The bending rebound model (BRM) is established with bending moment, geometrical features and material properties, and the SDM is finally calculated by initial deflection, rebound deflection and span parameters of the DIDCS. On basis of the DIDCS, the straightening process is simulated with the established finite element analysis model (FEM) to demonstrate the longitudinal stress distribution and the reflection of different straightening stages. The proposed SDM is also experimentally validated on the ROSE-JZ50 straightening machine with different materials.
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Lu, Hong, Yongquan Zhang, Okonkwo Valentine Tochukwu, and Sheng Gao. "A Straightening Stroke-Deflection Modeling and Simulating Approach Based on Online Measurement." In ASME 2014 International Manufacturing Science and Engineering Conference collocated with the JSME 2014 International Conference on Materials and Processing and the 42nd North American Manufacturing Research Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/msec2014-4183.

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Straightening processing is one of the most important processes to improve straightness of linear motion components. The most urgent problem to be solved by the precision straightening process is the residual deflection caused by elastic rebound and obtaining accurate straightening stroke. Stroke-deflection model is a major critical factor that decides the precision and efficiency of straightening process. In this paper, a novel way to establish and simulate the stroke-deflection model is proposed based on mathematical method, bending experiment and online real-time measurement method. The online real-time technology, as well as online measurement experiment and data processing, improves the accuracy of stroke-deflection model. It is demonstrated that the stroke-deflection model adjusted by the online measurement model is more accurate than that of the theory model and bending experiment model. The stroke-deflection model based on online measurement can compensate the errors caused by various reasons and be more compatible with the actual straightening process.
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Xiong Guo-liang, Li Jun, and Zhao Yong. "Comparison of online identification methods of material parameters in press straightening process." In 2010 International Conference on Mechanic Automation and Control Engineering (MACE). IEEE, 2010. http://dx.doi.org/10.1109/mace.2010.5536576.

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