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manufacturing of ultra-large plate forgings by unfolding and flattening of thick cylinders

Journal of Central South University 2020年第8期27卷 2227-2238页

作者： DENG Zheng-hua WEN Tong YOU Jian-hao DU Kang-kang SUN Lei College of Materials Science and Engineering Chongqing UniversityChongqing 400044China Erzhong(Deyang)Heavy Equipment Co.Ltd. Deyang 618000China

Ultra-large plate forgings are foundation of heavy machinery,but many parts of the type cannot be made by conventional technologies due to the characters of extreme manufacturing in terms of size and quality *** paper introduced a systematically method called cylinder unfolding method(CUM)for producing large plate forgings,by using a serial of operations including“splitting”,“unfolding”,and“flattening”of a thick cylinder obtained from saddle *** technological route of CUM was presented in detail with an example of plate forging with the horizontal sizes of 6100 mm and thickness of 300 *** deformation features of saddle forging for fabricating transitional cylinders were analyzed,and then the subsequent handling steps including splitting,unfolding and flattening of the cylinder,as well as the auxiliary processing,were *** practice proved that CUM can provide an efficient way for manufacturing ultra-large plate forgings and meet the strict requirements in geometry and mechanical performance,without highly increasing the investments of forming equipment and tooling.

关键词： extreme manufacturing ultra-large plate forging cylinder unfolding method metal forming

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Femtosecond-laser sharp shaping of millimeter-scale geometries with vertical sidewalls

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International Journal of extreme manufacturing 2021年第4期3卷 61-72页

作者： Qiuchi Zhu Peixun Fan Nan Li Timothy Carlson Bai Cui Jean-François Silvain Jerry L Hudgins Yong Feng Lu Department of Electrical and Computer Engineering University of NebraskaLincolnNE 68588United States of America Department of Mechanical and Materials Engineering University of NebraskaLincolnNE 68588United States of America CNRS University of BordeauxBordeaux I.N.P.ICMCBUMR 5026F-33608 PessacFrance

As femtosecond(fs)laser machining advances from micro/nanoscale to macroscale,approaches capable of machining macroscale geometries that sustain micro/nanoscale precisions are in great *** this research,an fs laser sharp shaping approach was developed to address two key challenges in macroscale machining(*** on edges and tapered sidewalls).The evolution of edge sharpness(edge transition width)and sidewall tapers were systematically investigated through which the dilemma of simultaneously achieving sharp edges and vertical sidewalls were *** decreasing the angle of incidence(AOI)from 0◦to−5◦,the edge transition width could be reduced to below 10µm but at the cost of increased sidewall ***,by analyzing lateral and vertical ablation behaviors,a parameter-compensation strategy was developed by gradually decreasing the scanning diameters along depth and using optimal laser powers to produce non-tapered *** fs laser ablation behaviors were precisely controlled and coordinated to optimize the parameter compensations in general manufacturing *** AOI control together with the parameter compensation provides a versatile solution to simultaneously achieve vertical sidewalls as well as sharp edges of entrances and exits for geometries of different shapes and *** mm-scale diameters and depths were realized with dimensional precisions below 10µm and surface roughness below 1µ*** research establishes a novel strategy to finely control the fs laser machining process,enabling the fs laser applications in macroscale machining with micro/nanoscale precisions.

关键词： femtosecond laser extreme manufacturing millimeter-scale machining zero-taper drilling edge quality control

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