Fabrication of ring groove on inner surface of cylindrical blank by ironing from outer surface

Ozawa, Tatsunori; Kuboki, Takashi; Kajikawa, Shohei; Yamauchi, Akira; Gunji, Akira; Onishi, Katsuyuki

doi:10.1016/j.promfg.2018.07.407

Cited by 4 publications

(8 citation statements)

References 2 publications

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“…The previous study found that the concave shape was not perfectly formed and some "Non-filled-area" appeared around the upper and lower parts of the plug projection [2]. The study suggested that the "Non-filled-area" might be reduced by applying a reaction force on the tube-end surface.However, the effect was not verified [2].This study tried to verify the effect of applying the reaction force on the tube-end surface by the finite element analysis (FEA) and experiment. The FEA showed reaction force was effective for reducing "Non-filled-area" in the former half of the process.…”

mentioning

confidence: 83%

“…The patent explains the concept of the press forming which fabricates ring grooves by transferring the plug projection shapes. The plug shrinks in a unique manner for ejection after forming [1].A previous study by the authors explained basic behaviours of the method [2]. The previous study found that the concave shape was not perfectly formed and some "Non-filled-area" appeared around the upper and lower parts of the plug projection [2].…”

mentioning

confidence: 99%

“…The plug shrinks in a unique manner for ejection after forming [1].A previous study by the authors explained basic behaviours of the method [2]. The previous study found that the concave shape was not perfectly formed and some "Non-filled-area" appeared around the upper and lower parts of the plug projection [2]. The study suggested that the "Non-filled-area" might be reduced by applying a reaction force on the tube-end surface.However, the effect was not verified [2].This study tried to verify the effect of applying the reaction force on the tube-end surface by the finite element analysis (FEA) and experiment.…”

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confidence: 99%

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Fabrication of a ring groove on tube-inner surface by ironing from outer surface using displacement control of tube bottom end

Junki¹,

Shohei²,

Akira³

et al. 2021

16th Edition of the International Conference on Computational Plasticity

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This paper presents a improving method in a press forming for transferring convex shapes of an inner plug projection onto the tube-inner surface by applying outer-die ironing from the tube-outer surface. A patent of the concept was submitted by some of authors [1]. The patent explains the concept of the press forming which fabricates ring grooves by transferring the plug projection shapes. The plug shrinks in a unique manner for ejection after forming [1].A previous study by the authors explained basic behaviours of the method [2]. The previous study found that the concave shape was not perfectly formed and some "Non-filled-area" appeared around the upper and lower parts of the plug projection [2]. The study suggested that the "Non-filled-area" might be reduced by applying a reaction force on the tube-end surface.However, the effect was not verified [2].This study tried to verify the effect of applying the reaction force on the tube-end surface by the finite element analysis (FEA) and experiment. The FEA showed reaction force was effective for reducing "Non-filled-area" in the former half of the process. However, the continuously applied reaction force expanded the "Non-filled-area" in the latter half of the forming. Therefore, the reaction force should be reduced in the middle of the process. The displacement control of the floor die was used for the control of the reaction force. The FEA showed the suitable amount of the reaction force and the optimum timing for reducing the force. The analytical results were verified by the experiment and the "Non-filled-area" was successfully reduced by the proposed method.

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confidence: 83%

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confidence: 99%

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confidence: 99%

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Fabrication of a ring groove on tube-inner surface by ironing from outer surface using displacement control of tube bottom end

Junki¹,

Shohei²,

Akira³

et al. 2021

16th Edition of the International Conference on Computational Plasticity

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“…where is: So, contact pressure p can be calculated by expression (20) where A2 is rounded surface which depends on arch length l and sample width b (21). With particular values, l is given by (22) and p by (23).…”

Section: Procedures Of Contact Pressure Determinationmentioning

confidence: 99%

“…In paper [19] introduced are engine pistons succesful manufacturing process of thick aluminium sheets with important ironing operation. Paper [20] give simulation and analysis of cylindrical parts ironing with profile inner plug indent onto inner surface of blank. Final estimation is favorable application in real conditions.…”

Section: Introductionmentioning

confidence: 99%

New Method of Defining of Process Parameters in Double Side Thinning Strip Ironing Test

Aleksandrović¹,

Ðačić²,

Djordjević³

et al. 2020

Tribol. Ind.

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New way for defining of main process parameters procedure in the strip ironing process with double side thinning, as well as appropriate experimental results are presented in this paper. Given is improved analysis for friction coefficient and contact pressure defining. Classical common so called "Schlosser model" and other similar models are not suitable in certain cases, and give unreal values for both of main process parameters. Expressions obtained here were verified in suitable examples which are, also, presented in the paper. Verification was performed on the base of experimental results. Realized was the single and four phases ironing process of mild steel DC04 in sheet stripes drawing test. Stripes were 20 mm wide and 2.5 mm thick. Lateral force intensities were 5, 10 and 15 kN. Maximal obtained thinning deformation in one phase was about 17 %. Appropriate lubrication with mineral oil and grease was used in conditions of lower speed of 20 mm/min. Results shows that proposed improved procedures enables more precise process monitoring and precise quantification of lateral force, contact pressure and thinning strain influence on friction.

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2021

Adv.Tech&Mat.

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Comparison of application of constant and variable lateral force in strip ironing process with double side thinning are presented in the paper. Given are the experimental results for single and multiphase ironing process with constant lateral force during the course of particular process. Material used was mild steel DC04. Stripes were 20 mm wide and 2.5 mm thick. Constant lateral force intensities were 5, 10 and 15 kN. Lubrication was with appropriate mineral oil and grease. In other side given is analysis of idea of possibility to apply variable lateral force during the strip ironing process and consequences of this action. Expected is control of strip thickness variation with difficulties because of contact and other appearances influence.

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Fabrication of ring groove on inner surface of cylindrical blank by ironing from outer surface

Cited by 4 publications

References 2 publications

Fabrication of a ring groove on tube-inner surface by ironing from outer surface using displacement control of tube bottom end

Fabrication of a ring groove on tube-inner surface by ironing from outer surface using displacement control of tube bottom end

New Method of Defining of Process Parameters in Double Side Thinning Strip Ironing Test

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