Analysis of the elastic characteristics at die and workpiece to improve the dimensional accuracy for cold forged part

Lee, Y.S.; Lee, J.H.; Kwon, Youngeun; Ishikawa, Takashi

doi:10.1016/j.jmatprotec.2004.04.291

Cited by 19 publications

(12 citation statements)

References 13 publications

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“…Contact pressure acting on the die wall results in its elastic deformation. Positive elastic radial displacement of the internal die wall introduces positive dimensional errors to both the inner and outer diameter of the extruded cup [6]. In addition, since the contact pressure is variable along the axial direction, the radial displacement of the internal die wall also vary, i.e.…”

Section: Die Elastic Deformationmentioning

confidence: 99%

“…This is especially true for extruded steel samples. A high level of internal pressure and especially local stress concentration directly affect die wear occurrence, tooling damage and failure [4] as well changes in die geometry [5] which altogether result in poor part accuracy [6] and tool life [7]. The tooling concept, design, and manufacturing procedure also depend on the amount of acting stresses [8].…”

Section: Introductionmentioning

confidence: 99%

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The Influence of Extrusion Ratio on Contact Stresses and Die Elastic Deformations in the Case of Cold Backward Extrusion

Pepelnjak

Milutinović

Plančak

et al. 2016

SV-JME

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Section: Die Elastic Deformationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Influence of Extrusion Ratio on Contact Stresses and Die Elastic Deformations in the Case of Cold Backward Extrusion

Pepelnjak

Milutinović

Plančak

et al. 2016

SV-JME

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“…To take into account a higher amount of factors influencing steel recovery during drawing, and to improve accuracy of finite element simulating results, approaches of reverse engineering are used [3,4]. Thus, in the paper [4] the effects of thermal deformation and recovery of the workpiece and the die on the final dimensional accuracy were investigated.…”

Section: Introductionmentioning

confidence: 99%

“…Thus, in the paper [4] the effects of thermal deformation and recovery of the workpiece and the die on the final dimensional accuracy were investigated. Friction and thermal conditions obtained from inverse engineering were used to simulate numerically the deformation and the occurrence of heat transfer during cold wire-drawing process using FEA.…”

Section: Introductionmentioning

confidence: 99%

Recovery Effect in Drawing of Steel Bar for Sizing

Корчунов

Гун

Polyakova

2014

Procedia Engineering

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Dimensional accuracy characterized by limit deviation in diameter is of great importance for the sized steel used for critical machine parts and tool production. Sized steel is manufactured by cold drawing with small single reductions. One of the ways to improve the dimensional accuracy is to take into account the recovery effect. As a result of the effect above the sized steel diameter after drawing is a bit larger than the die bearing diameter in the non-loaded condition. For some predetermined combinations of the drawing process factors the recovery value is quite comparable with the diameter tolerance limit determined by standards. It is especially characteristic for sized steel more than 10 mm in diameter with yield strength of more than 400 MPa. The study describes the investigation results of the drawing process factors influence the value of sized steel recovery. Using the finite elements method the authors carried out simulation of stress and strain state in the deformation zone during drawing. It was proved that there was a relationship between the radial stresses developed on the sized steel surface on the exit from the die bearing zone and the recovery value. The research group determined the dependence of recovery value on the degree of reduction, the coefficient of contact friction, the die semi-angle and the die bearing length, the bar yield strength and its diameter. The obtained results make it possible to determine the parameters of sized steel drawing with the preset diameter limit deviation taking into account the recovery effect within a wide deviation range of processing factors.

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“…Besides determining the loads to carry out forging operation, the determination of stress, strain, strain rate, and temperature distribution in the material during processing as well as the determination of residual stresses after processing are all very important for producing a forged product with good quality. [1][2][3] In forging operation, the material is subjected to three-dimensional (3D) stress states and the process is steady in nature. 4 The physical phenomena occurring inside the die cavity and the effects of process parameters on the final product are very difficult to understand, especially for the multi-stage forging process.…”

Section: Introductionmentioning

confidence: 99%

Residual stress analysis of the multi-stage forging process of a nickel-based superalloy turbine disc

Zhang

et al. 2012

Proceedings of the Institution of Mechanical Engineers, Part G:

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In order to analyze the multi-stage forging process of a nickel-based GH4169 superalloy (similar to Inconel 718 alloy) aero-engine turbine disc with high efficiency and accuracy, a modified material constitutive law, grid convergence study, and a combined two-dimensional and three-dimensional finite element simulation technology were used to analyze the thermo-mechanical-coupled stress variation during the turbine disc multi-stage forging process with the general-purpose nonlinear finite element software MSC.Marc. The predicted finite element forging residual stresses were tested and verified with the measurement results by the layer removal method; it was found that the constitutive law combined with heat contact properties between dies and material could be used to accurately predict and analyze the turbine disc forging processes. Based on the predicted precise and comprehensive finite element residual stress distributions, the consequent disc anti-fatigue manufacturing technologies could be optimized and improved greatly, which would guarantee the stable manufacturing quality and excellent performance of the aero-engine turbine disc.

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Analysis of the elastic characteristics at die and workpiece to improve the dimensional accuracy for cold forged part

Cited by 19 publications

References 13 publications

The Influence of Extrusion Ratio on Contact Stresses and Die Elastic Deformations in the Case of Cold Backward Extrusion

The Influence of Extrusion Ratio on Contact Stresses and Die Elastic Deformations in the Case of Cold Backward Extrusion

Recovery Effect in Drawing of Steel Bar for Sizing

Residual stress analysis of the multi-stage forging process of a nickel-based superalloy turbine disc

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