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Innovation in the Computing System of straightening Force

Chinese Journal of Mechanical Engineering 2010年第1期23卷 115-121页

作者： CHEN Min JIANG Xiaomin ZHAO Zuxin HUANG Xiaobo College of Mechanical Engineering Shanghai University of Engineering Science Shanghai 201620 China Schools of Mechanical and Power Engineering East China University of Science and Technology Shanghai 20023 7 China

Currently in China, the computing system of the straightening force of the six-rollers straightening machine generally follows the traditional computing system. The force status of the traditional computing system for the straightening force deviates far away from the actual force status of the roller system in the six-rollers straightening machine. In the traditional system, the computing model of the straightening force of the six-roller straightening machine was based on the roller shape of hyperbola, which led to the length of the contacting line between the tube and the straightening roller to be excessively short, i.e., only 0.1~）.2 of the length of the roller. Thus the constructed computing system has relatively large difference from the actual measured result. To solve the above problems, flattening straightening and bend straightening are analyzed on the basis of materials mechanics and bend beam theory, the roll er shape using the envelope method of A.I4.~e：mKoB is generated, and a new computing system for straightening force in six-rollers straightening machine is built. The roller shape of the straightening roller, on which the new computing system for the straightening force is based, is designed according to the envelope method under the condition of ideally full contacting between the tube and the roller body of the straightening roller, therefore the new computing model accords with the practical status of straightening force. According to the comparison of the new computing system with finite element method and the actual measured result of straightening force, it has been proved that the computation accuracy of the new computing system for straightening force satisfies the practical requirements of engineering. New six-rollers straightening machines are designed and manufactured according to the new calculation system, and the new machines not only have higher precision and quality, but also have adopted the force sensor and computer and combined w

关键词： straightening roller shape curve flattening bend finite element analysis

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Effect of process parameters on steel tube roundness in straightening process

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Journal of Iron and Steel Research International 2020年第11期27卷 1270-1283页

作者： Li-dong Ma Yu-kang Du Zhi-juan Meng Li-feng Ma Zi-jian Liu Pei-yu Liu Coordinative Innovation Center of Taiyuan Heavy Machinery Equipment Taiyuan University of Science and TechnologyTaiyuan 030024ShanxiChina School of Mechanical Engineering Taiyuan University of Science and TechnologyTaiyuan 030024ShanxiChina School of Materials Science and Engineering Taiyuan University of Science and TechnologyTaiyuan 030024ShanxiChina School of Applied Science Taiyuan University of Science and TechnologyTaiyuan 030024ShanxiChina

The inclined six-roll tube straightener is an important equipment for the finishing *** can not only straighten the steel pipe,but also finish the ovality of the cross *** the actual straightening process,the cross section of the tube is prone to deform,that is,the round ness is not *** flatteni ng displacement is an import a nt parameter to control cross-section forming of *** to the established mechanical model,the analytical calculation equations of the flattening force and the flattening displacement were derived using the energy *** on the finite element simulation data,the ratios of the finite element results of the什attening force to the analytical ones were *** correlation coefficient after fitting is greater than 99%,and the fitting effect is *** flattening experiment was carried out on tubes of different materials and different specifications,and the setting method of the optimal flattening displacement during straightening process was *** the actual straightening process,using this flattening displacement,the ovality of straightened steel tube is less than 0.3%.Therefore,the proposed method can provide a reference for the flattening displacement in the actual straightening process.

关键词： straightening Tube Energy method Flattening force Flattening displacement Finite element method

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Bauschinger-Like Effect of AZ31 Magnesium Alloy Wide Sheet During the straightening Process

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Acta Metallurgica Sinica(English Letters) 2021年第9期34卷 1255-1264页

作者： Fangkun Ning Qichi Le Yonghui Jia Liang Chen Key Laboratory of Electromagnetic Processing of Materials Ministry of EducationNortheastern UniversityShenyang 110819China

The Bauschinger-like effect, which showed up in the straightening process of the AZ31 magnesium alloy wide sheet, was investigated through the multi-pass discrete three-point bending–unloading–bending(BUB) experiments. The stress variable, anisotropy, and asymmetry of tension and compression on the straightening process were corresponding to the Bauschingerlike effect. The Bauschinger-like effect in the initial, intermediate, and end of the straightening process was dominated by the twinning, detwinning, and dislocation induced by pyramidal slip, respectively. Also, they were responsible for the transformation of the Bauschinger stress parameter(BSP) and Bauschinger energy parameter(BEP). Later, the anisotropic nonlinear kinematic hardening model(ANK model) to describe the Bauschinger-like effect was optimized and simplified.

关键词： Bauschinger-like eff ect straightening Discrete experiments Anisotropic nonlinear kinematic hardening model(ANK model)

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Effect of Temperature on Grain Size in AA6063 Aluminum Alloy Subjected to Repetitive Corrugation and straightening

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Acta Metallurgica Sinica(English Letters) 2019年第7期32卷 835-844页

作者： N. Thangapandian S. Balasivanandha Prabu K. A. Padmanabhan Department of Mechanical Engineering St. Joseph's Institute of Technology Chennai 600119 India Department of Mechanical Engineering College of Engineering Guindy Anna University. Chennai 600025 India

The influence of processing temperature on grain size reduction in AA 6063 aluminum alloy subjected to repetitive corrugation and straightening (RCS) is investigated in this work. The aluminum alloy was processed by RCS at different temperatures (room temperature, 100 ℃, 200 ℃ and 300 ℃) till the maximum number of passes possible before failure and the mechanical properties such as tensile strength and hardness were measured. The grain size and their misorientation of grains of the processed samples were analyzed using the electron backscattered diffraction. The results indicated that the transformation of low-angle grain boundaries to high-angle grain boundaries and dislocation tangles were highly dependent on the strain imparted, which could be controlled by selecting the proper processing temperature. As a result, the mechanical properties are affected. In particular, the room temperature tensile strength and hardness values of the processed material decrease with increasing processing temperature.

关键词： Repetitive corrugation and straightening Strain Grain size reduction/refinement EBSD Strength Hardness

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Improvement on straightness of metal bar based on straightening stroke-deflection model

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Science China(Technological Sciences) 2009年第7期52卷 1866-1873页

作者： LEOPOLD Juergen Fraunhofer Institute for Machine Tools and Forming Technology Chemnitz Germany

The straightening technics is one of important means to improve the straightness of metal bar. A novel way of predicting the straightening stroke is proposed based on mathematical methods and bending experimental and numerical simulation. The experimental and numerical simulation is conducted by following the mathematical load-stroke model of press straightening process under the elastic-plastic theory. For the linear guide rails, as an example, the stroke-deflection model focusing on the straightening stroke prediction can be achieved by contrasting and integrating the bending experimental results and finite element methods (FEM) simulation data. And then the formula for predicting the straightening stroke is presented based on the precise straightening stroke-deflection model. The stroke prediction formula with high precision can be applied to the straightening stroke prediction in the high straightness metal bar manufacturing process and automatic straightening machine conveniently.

关键词： straightness straightening stroke deflection stroke prediction metal bar

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Longitudinal crack on slab surface at straightening stage during continuous casting using finite element method

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Journal of Central South University 2010年第2期17卷 235-238页

作者：喻海良刘相华 State Key Laboratory of Rolling and Automation Northeastern University Department of Mechanical Engineering Tsinghua University

Deformation behavior of slab at the straightening stage during continuous casting was simulated by the explicit dynamic finite element method,and the stress distribution along the width direction of the slab and its change regularity at slab center during continuous casting were *** influence of distribution and change of stress on the propagation of longitudinal cracks on slab surface was *** results show that the tensional stress appears on slab surface at the inner arc side and the compressive stress appears on slab surface at the outer arc side at stages 6-8 in straightening zone during continuous *** cracks generally appear on slab top surface and do not appear on slab bottom surface,which are also observed in industry.

关键词： continuous casting slab straightening longitudinal crack finite element method

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A Solution of Drawing straightening Roller Curve by Conjugate Revolving Quadric Theory

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武汉理工大学学报 2006年第S1期28卷 206-209页

作者： DU Xiaozhong 1,2 ,WANG Jianmei1,HUANG Qingxue1,SUN Binyu1 (1.Taiyuan University of Science and Technology,Taiyuan 030024 ,China 2.Beijing University of Science and Technology,Beijing 100083 ,China) Taiyuan University of Science and Technology Taiyuan 030024 China Beijing University of Science and Technology Beijing 100083 China Taiyuan University of Science and Technology Taiyuan 030024 China

Based on the theory of conjugate revolving quadric theory,the analytic method of calculating the straightening roller curve in the procedure of straightening the bar has been given. Meanwhile,the equations,which describe roller curve and the longitudinal section,are given and simulated in computer. A brief method of designing and drawing the straightening roller curve is introduced.

关键词： roller curve simulation straightening

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The Role of Corrugation Die Parameters on the Mechanical Properties of Aluminum Alloy (AA 5083) Processed by Repetitive Corrugation and straightening

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Journal of Materials Science and Chemical Engineering 2015年第7期3卷 208-212页

作者： N. Thangapandian S. Balasivanandha Prabu Department of Mechanical Engineering College of Engineering Guindy Anna University Chennai India

The microstructure and mechanical properties of aluminium alloy (AA 5083) processed through Repetitive Corrugation and straightening (RCS) was studied. The RCS process consists of corrugating a flat specimen with a pair of systematically grooved dies and straightening was done with two parallel flat dies. The aluminium samples were subjected to RCS process using two different die: Die I-semi grooved die with breath = height = 5 mm and θ = 30。 and Die II-semicircular profile with radius = 10 mm. The specimens were subjected to maximum 8 passes for die I but the other one went upto 14 pass. The grain refinement was studied from the microstructure examination using TEM. The mechanical properties such as tensile strength, hardness and the grain size were compared. The tensile strength and hardness were found increasing with respect to the number of passes. The tensile strength increased 25% in the sixth pass when compared to the parent material. But the strength and hardness values were reduced at 8th pass due to the surface cracks. The TEM studies showed that the Die-I is superior to Die-II in terms of grain refinement.

关键词： Repetitive Corrugation and straightening Strain Rate Tensile Strength Hardness Grain Refinement

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Evaluation of Keratin Fibre Damage under Different straightening Conditions

Evaluation of Keratin Fibre Damage under Different Straighte...

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绿色纺织，健康生活——第三届纺织生物工程及信息学国际会议

作者： C.W.M.Yuen P.Y.Lau Institute of Textiles and Clothing The Hong Kong Polytechnic University

In this paper, hair as a keratin fibre was subjected to different straightening conditions. Various hair damage conditions in straightening process were simulated in order to investigate the effects of hair damages on their surface structures, colour differences, physical and chemical properties. It was indicated that different treatment conditions produced different degrees of hair damages because of the reduction of disulphide bonds on hair. After the straightening process, hair surface reflection increased but the corresponding strength decreased. However, when heat was applied onto hair pressing is too high, yellowing effect was resulted. Furthermore, the surface reflection was greatly affected by giving large colour difference when compared with the untreated hair.

关键词： hair keratin fibre structural damage straightening temperature colour difference

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Effect of flame heating pass on microstructure and properties of A6N01 aluminum alloy welded joint

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China Welding 2017年第1期26卷 21-28页

作者： Han Wenfeng Yu Min Fang Xifeng Wei Shubo Zhang Fengdong CRRC Qingdao Sifang Co. Ltd. School of Material Science and Engineering Southwest Jiaotong University

Flame heating combined with water cooling was used to straighten A6N01 aluminum alloy welded joint and effect of flame heating pass on its microstructure and mechanical properties was studied. Results showed that the flame induced the precipitation and growth of the Mg_2Si phase on the Al substrate for the thermal aging A6N01 aluminum alloy welded joints,thus it led the decrease of micro-hardness and tensile strength of the A6N01 aluminum alloy welded joint with the increase of the heating pass. However,the fatigue property of the flame heated joint was improved because the Mg_2Si precipitation hindered the initiation and propagation of the fatigue crack.

关键词： A6N01 welded joint flame straightening microstructure and property Mg2Si precipitation

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