Pass schedule algorithms for hot open die forging

Kim, P.H; Chun, Myung-Sik; Yi, Joon-Jeong; Moon, Young-Hoon

doi:10.1016/s0924-0136(02)00798-7

Cited by 42 publications

(22 citation statements)

References 8 publications

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“…They found that die shape in conjunction with reduction in height controls the bonding process. Kim et al (2002) developed a neural network algorithm for the closure of voids in open die forging of rectangular cross-sectioned workpieces. They studied a large number of process parameters and used the algorithm to recommend a forging pass schedule that would close voids effectively and efficiently.…”

Section: Introductionmentioning

confidence: 99%

Internal void closure during the forging of large cast ingots using a simulation approach

Lee

Tyne

et al. 2011

Journal of Materials Processing Technology

106

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Section: Introductionmentioning

confidence: 99%

Internal void closure during the forging of large cast ingots using a simulation approach

Lee

Tyne

et al. 2011

Journal of Materials Processing Technology

106

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“…The deformation displacement can be expressed by the O point coordinate. According to the literatures, 12,13 the expressions of the O point are shown as…”

Section: Deformation Model Of the Workpiecementioning

confidence: 99%

Processing control of the forging integration based on force compliance

Zhang

Shuai

et al. 2016

Advances in Mechanical Engineering

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The method of force compliance was proposed during process of the manipulator cooperating with the movement of the forging press, which could avoid the destructive effect generated by the deformation resistance of the workpiece for the key parts. Taking the 20T forging manipulator as the target, the inverse kinematics model and the dynamic model of the major-motion mechanism were established. Through taking the pressure as the controlled variable, the dynamic model of the hydraulic lifting system was built. Based on the buffering principle, the mathematics model of the horizontal buffering system was deduced. Taking the deformation model of workpiece as the input, the variations of the displacements and forces for hydraulic cylinders were obtained by the simulation. Finally, the effectiveness of active pressure compliance method of the lifting control system using the classical proportional-integral-derivative control strategy and that of the passive compliance method for the buffering system were verified.

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“…Kakimoto [3], afirma que 75 % do fechamento de vazios ocorre através de processos de compressão, evidenciando a importância do controle da deformação no forjamento. Entretanto, é de extrema importância a escolha certa dos parâmetros do processo, como a configuração das matrizes, o comprimento das mesmas, a redução aplicada a cada passe, o avanço e o gradiente de temperatura [4,5]. O avanço é o quanto se movimenta longitudinalmente a ferramenta em relação à peça após uma mordida, ou uma série delas na mesma região, caso haja rotação da peça.…”

Section: Introductionunclassified

Simulação Numérica Aplicada Ao Estudo Da Relação Entre Largura De Contato Da Matriz E O Alongamento No Forjamento Em Matriz Aberta

Cardoso¹,

Peteffi²,

Limberger³

et al. 2017

Anais Do Enemet - Encontro Nacional De Estudantes De Engenharia Metalúrgica, De Materiais E De Minas

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ResumoPara a fabricação de peças de grande porte, o forjamento em matriz aberta é o processo mais utilizado. Porém, se seus parâmetros não forem bem estabelecidos, defeitos metalúrgicos poderão surgir; esses, em sua maioria, provindos do material bruto de fusão, como rechupes e vazios. Para sanar tais defeitos, a deformação imposta na peça deve ser a mais homogênea possível. Neste estudo, a simulação numérica foi utilizada para verificar a relação entre a largura de contato matriz-peça e a espessura da parede de peças vazadas, com o objetivo de analisar o conceito de razão de mordida para esse tipo de geometria. Utiliza-se um billet cilíndrico inicial de 450 mm de comprimento, 360 mm de diâmetro externo e 120 mm de diâmetro interno, de material AISI 4140. As razões de mordida estudadas variam entre 0,2 e 1,4, sendo impostas variações de tempo em cada processo. Após análise, pôde-se verificar que as geometrias que apresentam distribuições mais homogêneas de deformação utilizaram razão de mordida de 0,4. Palavras-chave: Forjamento a quente; Matriz aberta; Simulação numérica. NUMERICAL APPLIED TO THE RELATIONSHIP BETWEEN THE STUDY OF CONTACT WIDTH OF MOTHER AND THE STRETCH IN FORGING OPEN IN MOTHER AbstractFor the manufacture of large parts, the open die forging is the most widely used process. But if its parameters are not well established, metallurgical defects may appear; these, mostly stemmed raw material in consequence of the casting process, such as cavities and voids. To solve these defects, the deformation imposed in the workpiece should be as homogeneous as possible. In this study numerical simulation was used to investigate the relationship between die-workpiece contact width and the wall thickness of the hollow workpieces analyzing the concept of bite ratio for this type of geometry. It uses an initial cylindrical hollow billet of AISI 4140 with 450 mm in length, 360 mm in outer diameter and 120 mm in internal diameter. The studied bite ratios range from 0.2 to 1.4, and time variations are imposed in each case. After the analysis, it was observed that geometries that have more homogeneous distributions of strain used a bite ratio of 0.4.

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Pass schedule algorithms for hot open die forging

Cited by 42 publications

References 8 publications

Internal void closure during the forging of large cast ingots using a simulation approach

Internal void closure during the forging of large cast ingots using a simulation approach

Processing control of the forging integration based on force compliance

Simulação Numérica Aplicada Ao Estudo Da Relação Entre Largura De Contato Da Matriz E O Alongamento No Forjamento Em Matriz Aberta

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