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Research status and progress of hot stamping

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Engineering Sciences 2012年第6期10卷 51-61页

作者： Song Leifeng ma mingtu Guo Yihui Fang Gang Liu Qiang Yao Zaiqi China Automotive Engineering Research Institute Co.Ltd. Geely Automobile Research Institute

In this article,current application,materials,key equipments,finite element(FE) simulation and parts properties of hot stamping are *** investigations of all processes and further excellent processes are *** survey of existing works,especially key equipments has revealed several *** new ideas and programs are proposed on the basis of traditional *** article aims at providing an insight into a whole process backgrounds and pointing out the great potential for further investigations and innovations of hot stamping.

关键词： hot stamping process material equipment simulation

Development and application research of light weight heat treated B-grade bulletproof steel

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Engineering Sciences 2014年第5期12卷 2-7页

作者： ma mingtu Chen Gang ma Yuhao Li Zhigang Feng Yi China Automotive Engineering Research Institute Co. Ltd. Chongqing 401122 China Shanghai Baosteel Hot Stamping Co. Ltd. Shanghai 201900 China Chongqing Haisen Electromechanics Co. Ltd. Chongqing 400039 China

The light weight heat treated B-grade bulletproof steel was developed through composition design and optimization based on multiplex alloying,multiplex micro-alloying design ideas and complex phase structure strengthening *** puzzle how to avoid the quenching deformation problem of super high strength thin sheet was solved through heat treatment in a die with a set of cooling *** B-grade bulletproof steel plate has fine tempered lath martensite *** shooting and certification test results showed that the shoot resistance of B-grade bulletproof steel plate can meet the protection demand of Protection specification for cash carrying vehicles(GA 164—2005).In comparison with B-grade bulletproof steel plate made by one of the companies in Sweden,the weight of the developed B-grade bulletproof steel plate can be decreased by 8 %under the same shoot resistance *** will be meaningful for cash truck and anti-hijacking vehicle to realize light weight,energy conservation and emission reduction.

关键词： alloying composition design die quenching super high strength B-grade bulletproof steel application research

Study of engaged performance regulation in controlled transfer clutch of 4WD car based on genetic sliding mode control

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Engineering Sciences 2014年第5期12卷 38-44页

作者： Zhang Yang Men Yongxin Li Wei ma mingtu Geely Automobile Research Institute Hangzhou 311228 China Shenyang University of Technology Shenyang 110870 China China Automotive Engineering Research Institute Co. Ltd. Chongqing 401122 China

This paper investigates an approach to improve the engagement quality of controlled transfer clutch mode in 4 wheel drive(WD) car from three considerations of reducing friction,smoothening responsiveness and alleviating *** method utilizes an improved sliding mode control with genetic algorithm instead of simplified mode to determine appropriate values of parameters in control close- *** simulation results show that the method is effective for improving the engagement quality of coupling satisfying different design needs for 4WD car,as well as robustness even if input torque is changed at a certain range.

关键词： 4WD transfer clutch sliding mode control genetic algorithm

Simulation about hot stamping of ultra-high strength steel on the basis of lightweight technology

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Engineering Sciences 2012年第6期10卷 67-70页

作者： Liu Qiang ma Fangwu Wang Xiaona Yao Zaiqi Song Wei Zhao Fuquan ma mingtu Song Leifeng Geely Automobile Research Institute China Automotive Engineering Research Institute Co.Ltd.

With the development of automobile lightweight,it is very necessary to apply the ultra-high strength steel parts manufactured by hot stamping,which offers the possibility to reduce the weight of automobiles and maintain the safety *** order to complete hot stamping,it is important to design the structure of parts reasonably,which is related with reasonable matching of *** objective of this paper is to guide the design of parts manufactured by hot stamping and find the forming technical requirements of vehicle *** experiments,the paper obtains the stress and strain curves at different deformation temperatures and strain *** on experimental data, the constitutive relationship model is established which can reflect the deformation capacity of ultra-high strength steel during the process of hot *** with finite element simulation results of hot stamping by commercial software AUTOFORM,transfer path of load and matching law of strength,the paper determines the design criteria and forming technical requirements of parts manufactured by hot *** the same time,the impact performance of front cross member internal plate is taken into consideration.

关键词： ultra-high strength steel hot stamping finite element simulation lightweight technology

State of the art of impact testers for spot welds

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Engineering Sciences 2014年第5期12卷 59-66页

作者： Hua Fu' an ma mingtu Li Jianping Wang Guodong The State Key Laboratory of Rolling and Automation Northeastern University Shenyang 110819 China China Automotive Engineering Research Institute Co. Ltd. Chongqing 401122 China Chongqing New material Engineering Center Chongqing 400039 China

Impact testing is a primary method to evaluate the impact property of resistance spot welding,which is an important quality index in automotive *** testing impact properties of spot welds,many customized testers have been *** paper summarized some of the impact testers reported in open literatures and the emphasis was placed on the equipment structures,functions,technical parameters,advantages and disadvantage,*** key issues about the development of the testers such as kinematic energy input mode,fixture design,combined load testing,sensor and data acquisition were ***,the problems and prospects in the research and development of impact testers for spot welds were pointed out.

关键词： resistance spot welding impact testing impact tester impact strength

Morphology observation for surface orange peel and fracture in tension sample of aluminum-alloy sheet and characterization of nano hardness

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Engineering Sciences 2012年第6期10卷 2-6页

作者： ma mingtu Mei Huasheng Lu Hongzhou Yang Hongya Wu Emei Zhou Mingbo China Automotive Engineering Research Institute Co.Ltd. No.59 Institute of China Ordnance Industry Chongqing New materials Engineering Center Key Laboratory of Advance Forging & Stamping Technology and Science Yanshan University

The tension property of aluminum-alloy sheet with different microstructures is measured, and the surface and tension fracture morphology of tension sample with and without orange peel are observed by using scanning electron microscope （SEM）. Surface roughness and nano hardness of tension sample are measured. The results show that the average elongation of the samples with orange peel is lower than that without orange peel ; especially the r value of per- pendicular to the rolling direction is much lower than that without orange peel. The tension surface of the orange peel samples is very rough; various parameters of surface roughness are higher. Under the observation of SEM, a wider slid- ing band with a micro crack on the surface of orange peel sample can be found. The various parameters of surface rough- ness without orange peel sample are near to zero, the sliding band is narrow and without micro cracks. The dimple width in tensile fracture of orange peel sample is larger than that without orange peel sample, but shear lip is narrower. The nano hardness testing results show that samples with orange peel behave high elastic modulus, high hardness, and high maximum load, but low plastic deformation depth. These mentioned features can completely describe surface and frac- ture morphology of tension samt31es with oranze peel.

关键词： mechanical property orange peel tension fracture nano hardness

Research on application of plastic materials in cars

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Engineering Sciences 2012年第6期10卷 92-96页

作者： Jin Jianwei ma Fangwu Liu Qiang Wu Tiannan Dong Ningning Zhao Fuguan ma mingtu Guo Yihui Geely Automobile Research Institute China Automotive Engineering Research Institute Co.Ltd.

This paper gives analysis of application status and prospect of plastic materials from the aspects of applied material amount comparison,development of new materials & new technologies,lightweight,design conception of new components,recyclability,simplification and diversity of materials,standardization of material specification and presents corresponding conclusions and suggestions.

关键词： plastic material lightweight application analysis environment protection

Study on the resistance spot welding technology of 22MnMoB hot stamping quenched steel

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Engineering Sciences 2014年第5期12卷 45-53页

作者： Feng Yi ma mingtu Hua Fu'an Zhang Junping Song Leifeng Jin Qingsheng China Automotive Engineering Research Institute Co. Ltd. Chongqing 401122 China The State Key Laboratory of Rolling and Automation Northeastern University Shenyang 110819 China

In this paper, the spot welding technology of a new kind of 22MnMoB hot stamping quenched steel sheet was systematically studied by power frequency spot welder. Through a series of technology and test experiments, we have obtained the optimal spot welding technological parameter condition. According to the results, the relations among spot welding technological parameter, welding nugget, mechanical property and fracture mode were discussed. The effects of all the welding parameters such as welding current, welding time and electrode force on the quality of joint can be boiled down to one thing--the diameter of welding nugget. The experimental results showed that welding nugget diameter determines the mechanical property of spot welding joint and the relation between welding nugget diameter and the mechanical property of joint presents a kind of linear mathematic representation. There are two typical fracture models of 22MnMoB hot stamping quenched steel sheet, i.e., interracial fracture and nugget pullout. Other than mild steel or normal high strength steel, in the shearing tensile test, hot stamping quenched steel has a great tendency to fail in interfacial mode due to the effects of high strength matrix structure, welding soft zone and the porosity level of fusion zone.

关键词： hot stamping quenched steel resistance spot welding maximum shearing force nugget diameter soft zone fracture mode

Numerical simulation of hot stamping of side impact beam

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Engineering Sciences 2012年第6期10卷 62-66页

作者： Guo Yihui ma mingtu Fang Gang Song Leifeng Liu Qiang Wang Xiaona Zhou Dianwu China Automotive Engineering Research Institute Co.Ltd. State Key Laboratory of Advanced Design and manufacturing for Vehicle Body Hunan University Geely Automobile Research Institute

Ls-DYNA software is adopted to conduct research of numerical simulation on hot stamping of side impact beam to calculate the temperature field distribution, stress field distribution, forming limit diagram （FLD） figure, etc. in the course of hot stamping so as to predict and analyze the formability of parts. ProCAST software is employed to conduct research of numerical simulation on solid quenching course concerning hot stamping to calculate temperature field distri- bution of tools and component of muhiple stamping cycles. The results obtained from numerical simulation can provide significant reference value to hot stamping part design, formability predication and tools cooling system design.

关键词： hot stamping numerical simulation FLD temperature field