Determination of Optimal Shrink Fitting Ratio for 2-layer Compound Forging Die by Improving Fatigue Life in Backward Extrusion

Wang, Chanchin; Kam, Hengkeong; Wang, Xin

doi:10.1016/j.proeng.2017.10.984

Cited by 5 publications

(3 citation statements)

References 3 publications

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“…Boutoutaou et al researched the effect of the surface roughness on the stress distribution of the shrink fitting by using the FE analysis method [ 17 ]. Wang et al proposed a method for determining the shrink-fitting ratio for the two-layer compound forging mold in the backward extrusion according to the FE simulation results [ 18 ]. Kamal et al researched the effect of the radial thermal gradient on the stress distribution of multilayer, thick-walled cylinders [ 19 ].…”

Section: Introductionmentioning

confidence: 99%

Precise Shrink Fitting Design of the High Strength Gear Mold for the Precision Forging of Noncircular Spur Bevel Gears

et al. 2023

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Shrink fitting of forging mold (SFFM) is an effective method for improving mold strength, extending the mold’s service life and reducing the manufacturing cost of forging mold. However, due to the asymmetric geometry and complex stress distribution, the precise design of SFFM for the precision forging of noncircular bevel gears is very difficult. In this paper, a new precise design method of SFFM for the precision forging of noncircular bevel gears is proposed, which mainly includes the following five parts. First, a new design method for the mold parting surface—the curved surface parting method—is proposed to design the forging mold of noncircular spur bevel gears. Then, new dimension design methods for the gear mold and shrink rings based on the uniform shrinkage force are proposed. Third, a new design method for the inhomogeneous interference value between shrink rings and the gear mold is developed to provide a precise, uniform shrinkage force. After that, a strength correction method for the shrink-fitted gear mold is proposed to ensure the gear mold and shrink rings have sufficient strength both in the assembly process of the shrink-fitted gear mold and precision in the forging process of noncircular spur bevel gears. Ultimately, finite element simulations and verification experiments are performed to verify the proposed precise design method of SFFM for the precision forging of noncircular bevel gears. The precise design method of SFFM proposed in this paper is not only applicable to the precise design of the high-strength gear mold for noncircular bevel gears, but can also provide a valid reference for the precise design of the high-strength mold for other complicated asymmetric parts.

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Section: Introductionmentioning

confidence: 99%

Precise Shrink Fitting Design of the High Strength Gear Mold for the Precision Forging of Noncircular Spur Bevel Gears

et al. 2023

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“…Li et al [ 20 ] conducted three-point bending fatigue tests of WC-Co cemented carbides with single edge notches under static and cyclic (20 Hz) loads at room temperature. Wang et al [ 21 ] used an experimental “master fatigue limit diagram” of the die insert material SKD11 [ 22 ] to calculate an optimized shrink-fitting ratio for a two-layer compound die in backward extrusion. Tanrikulu and Karakuzu [ 2 ] performed experimental and numerical studies to predict quantitatively the fatigue life of a WC-Co20% cold forging die using an improved Goodman–Haigh diagram and the Basquin law [ 23 ].…”

Section: Introductionmentioning

confidence: 99%

A New General Fatigue Limit Diagram and Its Application of Predicting Die Fatigue Life during Cold Forging

Joun

Chung

et al. 2022

Materials

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Traditional fatigue fracture theory and practice focus principally on structural design. It is thus too conservative and inappropriate when used to predict the high-cycle fatigue life of dies used for metal forming, especially cold forging. We propose a novel mean stress correction model and diagram to predict the high-cycle fatigue lives of cold forging dies, which focuses on the upper part of the equivalent fatigue strength curve. Considering the features of die materials characterized by high yield strength and low ductility, a straight line is assumed for the tensile yield line. To the contrary, a general curve is used to represent the fatigue strength. They are interpolated, based on the distance ratio, when finding an appropriate equivalent fatigue strength curve at the mean stress and stress amplitude between the line and curve. The approach is applied to a well-defined literature example to verify its validity and shed light on the characteristics of die fatigue life. The approach is also applied to practical forging and useful qualitative results are obtained.

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“…So, it is important to study the forged materials and forging conditions as well as the design of forging processing. Simulation technology can greatly overcome the design problems of forging dies [8][9][10]. For instance, Lee et.…”

Section: Introductionmentioning

confidence: 99%

Effect of cold forging on mechanical and corrosion behaviors of carbon steel plate

Esmailzadeh

Mousavi

Esfahani

et al. 2022

International Journal of Pressure Vessels and Piping

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Determination of Optimal Shrink Fitting Ratio for 2-layer Compound Forging Die by Improving Fatigue Life in Backward Extrusion

Cited by 5 publications

References 3 publications

Precise Shrink Fitting Design of the High Strength Gear Mold for the Precision Forging of Noncircular Spur Bevel Gears

Precise Shrink Fitting Design of the High Strength Gear Mold for the Precision Forging of Noncircular Spur Bevel Gears

A New General Fatigue Limit Diagram and Its Application of Predicting Die Fatigue Life during Cold Forging

Effect of cold forging on mechanical and corrosion behaviors of carbon steel plate

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