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COUPLED ELECTRICAL-THERMAL-MECHANICAL ANALYSIS FOR ELECTRICAL/LASER HEATING ASSISTED blanking

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Chinese Journal of Mechanical Engineering 2006年第2期19卷 294-299页

作者： PENG Xianghe QIN Yi Department of Engineering Mechanics Chongqing UniversityChongqing 400044 China Department of Design Manufacture and Engineering ManagementUniversity of StrathclydeGlasgow G11XJ UK

A coupled electrical-thermal-mechanical analysis is conducted for electrical/laser heating assisted blanking. Two novel localized-heating methods, electrical heating and laser-heating, recently proposed for small-part blanking, are investigated with FE simulations. Results show that electrical heating would result in an advantageous distribution of temperature in a 316 stainless steel work-material. A desired temperature distribution may also be achievable for a copper work-material, if laser beam is used. Both electrical heating and laser-heating enable to reduce the blanking force and increase the aspect ratio achievable by blanking. The simulation also demonstrates that both electrical heating and laser-heating can result in desired temperature-distributions at sufficiently high heating-rates, ease of implementation and application. Comparatively, electrical heating could generate more favorable temperature distribution for small-part blanking.

关键词： blanking Electrical heating Laser-heating

Experimental and numerical investigations of the mechanical behavior of half sandwich laminate in the context of blanking

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Advances in Manufacturing 2020年第2期8卷 177-188页

作者： Sheng Cai Lin Chen Department of V ehicle Engineering College of EngineeringChina Agricultural UniversityBeijing 100083People's Republic of China CW Bearing GmbH Hamburg 22113Germany

In this study,the complex mechanical behavior of an aluminum/low-density polyethylene(LDPE)half sandwich structure was investigated during the blanking process.Mechanical tests were conducted for the polymer and metal layer and the delamination behavior of the adhesive between the two layers.A new testing device was designed for detecting the delamination under tensile mode.Corresponding finite element models were established for the mechanical tests of the metal layer and the delamination of both layers for inverse parameter identifcation.Material parameters for Lemaitre-type damage,Drucker-Prager,and cohesive zone modeIs were identified for the metal,polymer,and adhesive,respectively.A finiteelement(FE)model was established for the blanking process of the sandwich structures.The experimental forcedisplacement curves,obtained in the blanking process of the half sandwich sheet,were compared with the predicted results of the FE model.The results showed that the predicted force-displacement curves and the experimental results were in good agreement.Additionally,the correlation between cutting clearance and changes in the forcedisplacement curves was obtained.Three feature values quantitatively described the imperfection of the experimental cutting edge.The effect of punch clearance on these values was studied numerically and experimentally.The results indicated that a smaller clearance generated a better cutting-edge quality.The stress state of the half sandwich structure during blanking was analyzed using the established FE model.

关键词： Sandwich plates blanking Continuum damage mechanics(CDM) Drucker-Prager model Cohesive zone model

The Applied Research of Fracture in Three-point Bending to blanking of Bearing Steel

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上海交通大学学报 2004年第Z2期38卷 199-205页

作者： Youtang Li Ping Ma Changfeng Yan College of Mechano-Electronic Engineering Lanzhou University of Technology Lanzhou730050 China College of Mechano-Electronic Engineering Lanzhou University of Technology Lanzhou730050 China College of Mechano-Electronic Engineering Lanzhou University of Technology Lanzhou730050 China

The application of fracture in three-point bending to blanking of bearing steel is studied in this paper. Several mechanical models of stress blanking are discussed at first. And then the experiments have been made in special equipment of three-point bending designed by us. Several problems, such as the suitable span, the relations between bending and tension bending complex, the ratio of blanking length to the diameter, the relations of blank length to force, the feature of fracture, are studied through the experiments. The suitable parameters of three-point bending to blanking, depth and tip radius of notch and the ratio between blanking length and stick diameter have been proposed.

关键词： bearing steel three points bending blanking crack technique fracture design

Dynamic Constitutive Model of Physical Simulation in High-Speed blanking for C5191 Phosphor Bronze

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Transactions of Nanjing University of Aeronautics and Astronautics 2018年第6期35卷 1010-1017页

作者： Hu Daochun Chen Minghe Wang Lei Yin Liming College of Mechanical and Electrical Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016P.R.China School of Mechatronics Engineering Taizhou Vocational&Technical CollegeTaizhou 318000P.R.China College of Mechanical Engineering Taizhou UniversityTaizhou 318000P.R.China Jiangsu Engineering Technology Research Center of Precision High-Speed Die Kunshan 215316P.R.China

Strain hardening,strain rate strengthening and thermal softening data of C5191 phosphor bronze at highspeed blanking are not easy to be obtained with a general measure method,therefore,it is quite difficult to establish the dynamic constitutive model.To solve this problem,the tensile properties at a strain rate of 1 s^(-1) by GLEEBLE-3500,and dynamic tensile conditions at strain rates of 500,1 000 and 1 500 s^(-1) by split Hopkinson tensile bar (SHTB) apparatus are studied.According to these test data,the classic Johnson-Cook equation is modified.Furthermore,the modified Johnson-Cook equation is validated in the physical simulation model of high-speed blanking.The results show that the strength of C5191 phosphor bronze maintains a certain degree of increase as the strain rate increasing and presents a clear sensitivity to strain rate.The modified Johnson-Cook equation,which has better description accuracy than the classical Johnson-Cook equation,can provide important material parameters for physical simulation models of its high-speed blanking process.

关键词： C5191 phosphor bronze split Hopkinson tensile bar(SHTB) Johnson-Cook equation dynamic constitutive model high-speed blanking

Experimental evaluation of blanking and piercing of PVC based composite and hybrid laminates

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Advances in Manufacturing 2016年第3期4卷 248-256页

作者： Vahid Zal Hassan Moslemi Naeini Ahmad Reza Bahramian Behnam Abbaszadeh Faculty of Mechanical Engineering Tarbiat ModaresUniversity Tehran Iran Faculty of Chemical Engineering Tarbiat ModaresUniversity Tehran Iran

blanking is one of the high speed processes to produce fiat products from sheets economically. In order to expand this process to new materials, the blanking of polyvinyl chloride （PVC）/fiberglass thermoplastic com- posite laminates and composite/aluminum hybrid laminates was investigated. The laminates were produced by the film stacking procedure and then blanked by circular die and punches. The blanking process was done in two levels of clearance including 4% and 8% of the laminates thickness, two levels of punch speed including 40 mm/min and 200 mm/min and at two levels of temperature （room tem- perature and 80 ℃） for both composite and hybrid laminates. The effects of the parameters on the maximum blanking force, cutting energy, and quality and precision of sheared edges were studied. Cutting mechanism for blanking in different conditions was explained. It was concluded that at room temperature, blanked composite and hybrid laminates had a high quality of sheared edges but at elevated temperature, although the maximum blanking force was reduced, the quality of sheared edge was reduced significantly.

关键词： Composite laminate Hybrid laminate blanking Fiberglass Polyvinyl chloride （PVC）

Ductile damage and simulation of fine-blanking process by FEM

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中国有色金属学会会刊：英文版 2000年第3期10卷 368-371页

作者： ZHANG Xing quan(张兴全) JIA Jian jun(贾建军) PENG Ying hong(彭颖红) RUAN Xue yu(阮雪榆) Shanghai Jiao Tong Univ Natl Die & Mold CAD Engn Res Ctr Shanghai 200030 Peoples R China

Based on the Curson Tvergaard void damage plastic potential equation and by using orthogonal rules of plastic material, the influence of void volume fraction on stress and strain fields was introduced into Levy Mises flow rules. The variation principle of rigid plastic material with void degradation was demonstrated. Furthermore, FEM equations coupled with damage factor were presented to study the void growth and the criterion to judge the damage was also given. Using the developed system, the fine blanking process was simulated and the sheared surface of the part edge was predicted. Meanwhile, the influence of process parameters, such as punch die clearance, V ring force, counter force, radius of punch and die edges, on the height and quality of the sheared surface was analyzed. The calculation results were compared with the experiments, which can be used to guide the design of fine blanking process.

关键词： fine blanking ductile fracture FEM simulation

Effects of Break-through State and System Rigidity on Vibration and Noise in blanking

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Journal of Harbin Institute of Technology(New Series) 1997年第2期4卷 112-117页

作者：郭斌李春锋刘钢郭涛

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关键词： blanking vibration noise break through rigidity

wbForming mechanism of collapse angle of fine blanking parts with sharp corners and influence of position of V-ring indenter of die on it

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石化技术 2019年第10期26卷 158-160页

作者： Xiaomei Yang Chen Yitao Jie Wang School of Mechanical Engineering and Automation Wuhan Textile University

Fine blanking parts with sharp corners produce collapse angles in the fine blanking process,and larger collapse angles can affect the parts’ performance and lifetime. In this paper,a fine blanking part with sharp corners was taken as an example to analyze the forming mechanism of the collapse angles by DEFORM 3 D,then studying the influence of the position of the V-ring indenter of die on the collapse angle. It was concluded that the material’s metal flow line was intensive near the blanking clearance;The equivalent stress area of the material was mainly concentrated around the blanking clearance,and then gradually shrinked to joint of part and scrap;the closer the distance L was,and the smaller equivalent stress area was mainly concentrated around the blanking clearance was,and the smaller collapse angle was.

关键词： collapse angle DEFORM 3D fine blanking

Investigation on Two Electrically-Assisted Forming Processes of AZ31B Magnesium Alloy Sheets

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Journal of Shanghai Jiaotong university(Science) 2019年第4期24卷 409-416页

作者：刘凯董湘怀石文王新宝吴国洪 Shanghai Jiao Tong University Shanghai Aircraft Manufacturing Co. Ltd. Dongguan Hengli Mold Technology Industry Development Co. Ltd.

Two new types of electrically-assisted forming(EAF) processes of AZ31B magnesium alloy sheets,i.e., electrically-assisted blanking(EAB) and electrically-assisted sheet upset-extruding(EASUE), are proposed in this paper. During EAB, pulsed current(PC) decreases blanking load and improves blanked surface quality,and higher frequency has a more effective improvement;when the frequency reaches 600 Hz, the whole punched hole fracture is improved to smooth zone. Moreover, EAB does not influence the microstructure and does not induce obvious annealing, and this process is advantageous to the materials that cannot change microstructure.During EASUE, PC can reduce extrusion load and enhance extrusion height, and higher frequency also has a more effective improvement. Both processes indicate that introducing PC can effectively improve the part quality and have an application prospection.

关键词： electrically-assisted blanking (EAB) electrically-assisted sheet upset-extruding (EASUE) pulsed current (PC) AZ31B magnesium alloy electroplasticity