Variation of the friction conditions in cold ring compression tests of medium carbon steel

Zhang, Dawei; Liu, Bingkun; Li, Jingxiang; Cui, Minchao; Zhao, Shengdun

doi:10.1007/s40544-018-0256-0

Cited by 27 publications

(9 citation statements)

References 34 publications

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“…As Ra increases from 0.2 to 3.2, the rib height increases by 0.11 mm and 0.1 mm for CG and UFG pure copper, respectively. Namely, with the increase of the friction factor, the load gradually increases, which went well with the research of Zhang [13]. In the first stage, the space inside the groove is spacious, and the deformation resistance generated mainly comes from the plastic flow of UFG copper.…”

Section: Effect Of Surface Roughnesssupporting

confidence: 67%

“…Due to the benefit of bulk production, considerable investigations were conducted in micro forming over recent decades [11,12] to investigate the deformation behavior and friction factor of metals, mainly including ring compression, double-cup extrusion and spike forging test [13,14]. However, these tests each have its advantages and shortcomings, which can't reflect the actual cold forging process.…”

Section: Introductionmentioning

confidence: 99%

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Deformation Behavior and Microstructural Evolution of T-Shape Upsetting Test in Ultrafine-Grained Pure Copper

Jiang

Yan

et al. 2021

Materials

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Ultrafine-grained (UFG) materials can effectively solve the problem of size effects and improve the mechanical properties due to its ultra-high strength. This paper is dedicated to analyzing the deformation behavior and microstructural evolution of UFG pure copper based on T-shape upsetting test. Experimental results demonstrate that: the edge radius and V-groove angle have significant effects on the rib height and aspect ratio λ during T-shape upsetting; while the surface roughness has little effect on the forming load in the first stage, but in the second stage the influence becomes significant. The dynamic recrystallization temperature of UFG pure copper is between 200 °C and 250 °C.

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Section: Effect Of Surface Roughnesssupporting

confidence: 67%

Section: Introductionmentioning

confidence: 99%

Deformation Behavior and Microstructural Evolution of T-Shape Upsetting Test in Ultrafine-Grained Pure Copper

Jiang

Yan

et al. 2021

Materials

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“…And the center region adopted two-layer elements, as shown in Fig. 3 Li, Zhao, Zhu, Zhang and Jiang, Journal of Advanced Mechanical Design, Systems, and Manufacturing, Vol.16, No.1 (2022) Meanwhile, the contact between the roller surface and the tubular blank surface was represented by Coulomb's friction model, and the corresponding friction coefficients were all set as 0.1 (Zhang et al, 2020).…”

Section: Geometry Model and Meshingmentioning

confidence: 99%

Influence of process parameters on the forming results of large-sized cylindrical parts during counter-roller spinning

Zhao

Zhu

et al. 2022

JAMDSM

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As an advanced plastic-forming method, counter-roller spinning (CRS) is mainly applied to process large-sized, thin-walled cylinder for aerospace rocket engine. Medium carbon quenched and tempered steel 30CrMnSiA is a typical material for solid rocket motor due to its high strength, high toughness and good fatigue resistance. The determination of complex process parameters and the detection of multiple forming indexes are necessary for the study of CRS. In this paper, a finite element (FE) model for CRS of 30CrMnSiA cylinder with a diameter of 2.25 m was established and verified according to the experimental data. The effects of multiple process parameters on the forming results were studied and analyzed by orthogonal experiment. Results reveal that the thinning ratio is the most important process parameter for all the forming results. Larger thinning rate can improve production efficiency but reduce forming accuracy and require equipment to provide greater spinning force. The influence laws of process parameters on the forming accuracy and spinning force of the outside of the cylindrical parts are similar to that of the inside of the cylindrical parts. In addition, the forming accuracy error and spinning force of the inside of the cylindrical parts are smaller than that of the outside of the cylindrical parts. Thus, the forming force and positioning accuracy of the outer roller holder can be given priority when developing the CRS equipment. Based on the ANOVA results, a multivariate nonlinear regression analysis was performed on the forming results by selecting significant process parameters as independent variables. The optimal range of process parameters for obtaining good forming results was obtained by processing the regression equation.

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“…The hammer and shear dies were modeled with the 4-node quadrilateral rigid element; the bar was modeled with 4-node tetrahedron element, and local mesh refinement was used at the notched zone with an element size of 0.1 mm. Tresca yield criterion τ = mk was applied to the friction between the bar and rigid dies; previous ring compression tests indicated that the Tresca friction factor m was 0.22–0.24 for the cleaned and lubricated medium steel with hydraulic oil 23 ; in the croppings tests under high-speed impact load, an appropriate value of 0.3 was set for the parameter m due to the bars and shear dies were not lubricated with any lubricant, and the roughness of the bar surface was larger The effects of notch depth h and axial clearance C 1 were investigated for h of 0–2 mm and C 1 of 0.5–4 mm, respectively.…”

Section: Experimental Tests and Fe Modelmentioning

confidence: 99%

Numerical and experimental investigation of notch-induced high-speed precise shearing of 42CrMo bar

Dong

Ren

Jiang

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part C:

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A notch-induced high-speed precise shearing method was developed for high-strength metal bars, which prefabricated V-shape circumferential notches in batch on the bar surface to make stress concentration, and applied a high-speed load to complete separation on a new type of electric-pneumatic counter hammer. The FE simulation and experimental tests were conducted; the inﬂuences of loading speed, notch depth, and axial clearance were analyzed on the fracture behavior and blank quality; the microfracture mechanism was further investigated. The results showed that the circumferential notch inhibited the plastic distortion and obtained high precision chamfered billets, with a roundness error of 1.34%, flatness error of 0.34 mm, and incline angle of 0.87°. Besides, the surface notch effectively reduced Max. impact force and fracture energy. The fractography revealed that: for the notched bar, the cracks initiated from the thin extrusion layers at the bilateral-notch tips, and from micro extrusion and intrusion at the top-notch tip. The predominant microfracture mechanism involves microvoid coalescence and forming of quasi-parabolic dimples along with the shear stress.

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Variation of the friction conditions in cold ring compression tests of medium carbon steel

Cited by 27 publications

References 34 publications

Deformation Behavior and Microstructural Evolution of T-Shape Upsetting Test in Ultrafine-Grained Pure Copper

Deformation Behavior and Microstructural Evolution of T-Shape Upsetting Test in Ultrafine-Grained Pure Copper

Influence of process parameters on the forming results of large-sized cylindrical parts during counter-roller spinning

Numerical and experimental investigation of notch-induced high-speed precise shearing of 42CrMo bar

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