UPPER BOUND ANALYSES OF NOVEL BACKWARD EXTRUSION

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HOSSEINI SEYED HADI; ABRINIA KAREN; FARAJI GHADER

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Journal: Modares Mechanical Engineering Year:2015 | Volume:14 | Issue:15 Page(s): 369-376

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Information Journal Paper

Title

UPPER BOUND ANALYSES OF NOVEL BACKWARD EXTRUSION

Author(s)

HOSSEINI SEYED HADI | ABRINIA KAREN | FARAJI GHADER | Issue Writer Certificate

Keywords

NOVEL BACKWARD EXTRUSIONQ2

UPPER BOUND ANALYSISQ2

FINITE ELEMENT SIMULATIONQ2

Abstract

In this paper, an UPPER BOUND ANALYSIS of NOVEL BACKWARD EXTRUSION was presented. Initially, deformation zone was divided in four separate regions and an admissible velocity field for each was suggested. Then, total power in this process was calculated for each region, therefore, extrusion force was obtained. Moreover, investigation of relevance of extrusion force and process powers (friction, deformation, velocity discontinuity) with process parameters revealed better understanding in load estimation and process efficiency in this method. Finite element analysis by DEFORMTM3D was utilized for validation of upper bound results. UPPER BOUND ANALYSIS showed increasing initial billet diameter enhances extrusion force by nonlinear relation. In addition, big billet size remodels NOVEL BACKWARD EXTRUSION to conventional backward extrusion and proves lower requirement extrusion load in NOVEL BACKWARD EXTRUSION in comparison with conventional backward extrusion. Moreover, increasing the first region’s thickness in this process diminishes extrusion force by exponential relation and no considerable change in extrusion force can be seen in a particular thickness domain. Investigation of process parameters in power efficiency showed that increasing the extruded part’s diameter created a critical condition in process efficiency because of high friction power. But increasing the thickness enhances power efficiency. Finally, UPPER BOUND ANALYSIS results had good agreement with FEA.

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APA: Copy

HOSSEINI, SEYED HADI, ABRINIA, KAREN, & FARAJI, GHADER. (2015). UPPER BOUND ANALYSES OF NOVEL BACKWARD EXTRUSION. MODARES MECHANICAL ENGINEERING, 14(15), 369-376. SID. https://sid.ir/paper/177729/en

Vancouver: Copy

HOSSEINI SEYED HADI, ABRINIA KAREN, FARAJI GHADER. UPPER BOUND ANALYSES OF NOVEL BACKWARD EXTRUSION. MODARES MECHANICAL ENGINEERING[Internet]. 2015;14(15):369-376. Available from: https://sid.ir/paper/177729/en

IEEE: Copy

SEYED HADI HOSSEINI, KAREN ABRINIA, and GHADER FARAJI, “UPPER BOUND ANALYSES OF NOVEL BACKWARD EXTRUSION,” MODARES MECHANICAL ENGINEERING, vol. 14, no. 15, pp. 369–376, 2015, [Online]. Available: https://sid.ir/paper/177729/en

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