A study of the impact of anti-adhesive coatings on the sheet-titanium forming processes

Adamus, J.; Lackner, J.M.; Major, Ł.

doi:10.1016/j.acme.2012.12.003

Cited by 13 publications

(10 citation statements)

References 15 publications

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“…Currently, the tribology of titanium sheets is the subject of many investigations in the context of forming temperature [14], lubricant type and contact pressures [15]. Adamus et al [16] investigated the effect of anti-adhesive coatings on steel tools in the sheet forming of titanium plates. The research showed a significant improvement in the surface roughness parameters of the formed surface with the use of multi-layer physical vapour-deposited coatings on the tool, and thus possible complete elimination of lubricants in the future.…”

Section: Introductionmentioning

confidence: 99%

Effect of Lubricant Type on the Friction Behaviours and Surface Topography in Metal Forming of Ti-6Al-4V Titanium Alloy Sheets

et al. 2021

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The aim of the research described in this paper is to analyse the synergistic effect of types of synthetic oil and their density on the value of the coefficient of friction (COF) of Ti-6Al-4V titanium alloy sheets. Lubrication performance of commercial synthetic oils (machine, gear, engine and hydraulic) was tested in a strip draw friction test. The friction tests consisted of pulling a strip specimen between two cylindrical fixed countersamples. The countersamples were placed in the simulator base mounted on a uniaxial tensile test machine. Due to the complex synergistic effect of different strip drawing test parameters on the COF, artificial neural networks were used to find this relationship. In the case of both dry and lubricated conditions, a clear trend was found of a reduction of the coefficient of friction with nominal pressure. Engine oil 10W-40 was found to be the least favourable lubricant in reducing the coefficient of friction of Grade 5 titanium sheets. The two main tribological mechanisms, i.e., galling and ploughing, played the most important role in the friction process on the test sheets. In the range of nominal pressures considered, and with the synthetic oils tested, the most favourable lubrication conditions can be obtained by using a type of oil with a low viscosity index and a high kinematic viscosity.

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Section: Introductionmentioning

confidence: 99%

Effect of Lubricant Type on the Friction Behaviours and Surface Topography in Metal Forming of Ti-6Al-4V Titanium Alloy Sheets

et al. 2021

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“…The traditional method used to address this problem is to increase or reduce the fillet radius and the clearance of the concave-convex die, reduce or increase the blank holding force at the sections that are easily cracked or wrinkled and promote or inhibit the material flow. 3,4 However, changes in the mold geometry inevitably affect the forming shape, and change in the geometry of the functional area affect the usage performance of the clamp directly. In addition, this method is strongly dependent on experience.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation study of influence of friction coefficient of die based on Abaqus on V-shaped clamp stamping parameters

et al. 2021

Advances in Mechanical Engineering

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To improve the forming quality of V-shaped clamps, a basis for optimal V-shaped clamp mold surface design is provided. In this paper, the V-shaped clamp stamping process is simulated using Abaqus and the influence of the mold’s friction coefficient on the V-shaped clamp stamping parameters is revealed. The regional friction coefficient of the V-shaped clamp mold surface is optimized using an equal horizontal design scheme and the optimal friction coefficient combination for the mold surface is obtained, along with comparison and analysis of the molding parameters before and after optimization. Results show that the mold’s surface friction properties have significant regional characteristics. Increasing the friction coefficient of the bottom, the rounded section of the punch’s V-shaped groove and the bulge filleted corner of the punch while reducing the friction coefficient of the bulge filleted corner and crimping area of the die head contributes to the material flow. Mold surface optimization makes the material flow velocity more uniform, disperses stress on the part’s surface, reduces strain and thickness reduction of the key parts, and improves overall quality. Measurements show that the V-shaped clamp mold’s surface friction characteristics affect the molding parameters significantly and mold optimization improves the V-shaped clamp’s molding quality.

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“…Unfortunately, forming products of such thin titanium sheets is one of the most difficult technological processes. It is connected with titanium's limited ability to plastically deform [11][12][13][14][15] and its high springback tendency [16] as well as low tribological properties [17][18][19][20][21]. Difficulties are encountered not only when forming sheet metal but also when joining.…”

Section: Introductionmentioning

confidence: 99%

Analysis of forming thin titanium panels with stiffeners

Adamus

Winowiecka

Dyner

2017

Archives of Metallurgy and Materials

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The growing demand for light and durable products has caused an increase in interest in products formed of thin sheets. In order to ensure sufficient stiffness of the drawn -parts, stiffening is often performed. Unfortunately, during the forming of stiffeners unwanted deformations of the drawn parts very often appear, which prevent them from further exploitation. In the paper, forming thin titanium panels with stiffeners is analysed. The panels are made of sheets of commercially pure titanium: Grades 2, 3 and 4. In the results of numerical analyses which were performed using PamStamp 2G, taking into consideration the impact of the blank holder force and friction conditions on the strain distribution in the drawn parts, sheet thinning and springback values are presented. The numerical analysis results were compared with the experimental tests. It was concluded that in order to prevent panel deformation being a result of residual stresses, it is necessary to ensure adequate friction conditions on the contact surfaces between the deformed material and tools as well as a suitable blank holder force.

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A study of the impact of anti-adhesive coatings on the sheet-titanium forming processes

Cited by 13 publications

References 15 publications

Effect of Lubricant Type on the Friction Behaviours and Surface Topography in Metal Forming of Ti-6Al-4V Titanium Alloy Sheets

Effect of Lubricant Type on the Friction Behaviours and Surface Topography in Metal Forming of Ti-6Al-4V Titanium Alloy Sheets

Numerical simulation study of influence of friction coefficient of die based on Abaqus on V-shaped clamp stamping parameters

Analysis of forming thin titanium panels with stiffeners

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