Lubricant test methods for sheet metal forming

Bay, Niels; Olsson, David; Andreasen, Jan Lasson

doi:10.1016/j.triboint.2007.11.017

Cited by 117 publications

(76 citation statements)

References 24 publications

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“…When a hard pin is sliding over a soft disc, the apparent friction coefficient obtained from the test is normally composed of plowing and shearing (adhesive) friction [20,21,31].…”

Section: Selection Of Friction Testing Techniques For the Friction Chmentioning

confidence: 99%

“…The plowing and shear friction have to be discriminated by means of FEM simulations [20,21] or theoretical analysis [24,32], and only the shear component of apparent friction representing the real friction between the two mating materials should be used in the FE simulations of metal forming operations as boundary conditions [20,21]. However, when the material combination of soft pin and 9 hard disc is used, the friction coefficients obtained from the tests are mainly attributed to the shearing (adhesive) friction.…”

Section: Selection Of Friction Testing Techniques For the Friction Chmentioning

confidence: 99%

“…During a friction test, the large variety of contact conditions, such as temperature, contact pressure, sliding distance, sliding velocity and oxidation scale should be considered very carefully [21], because these factors may influence the friction coefficients considerably.…”

Section: Selection Of Friction Testing Techniques For the Friction Chmentioning

confidence: 99%

“…The tribological test is a sensible technique to understand the physical fundamentals of the friction under hot aluminium extrusion conditions. In the past, tribological tests (pin/ballon-disc tests) have been employed to identify the friction coefficients for metal cutting 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 5 process [19][20][21][22]. Recently, the first attempt to determine the friction coefficient for hot aluminium extrusion process by using ball/pin-on-disc tests has been conducted [23,24].…”

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confidence: 99%

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Identification of a friction model for the bearing channel of hot aluminium extrusion dies by using ball-on-disc tests

Wang

Zhou

Duszczyk

et al. 2012

Tribology International

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“…When a hard pin is sliding over a soft disc, the apparent friction coefficient obtained from the test is normally composed of plowing and shearing (adhesive) friction [20,21,31].…”

Section: Selection Of Friction Testing Techniques For the Friction Chmentioning

confidence: 99%

Section: Selection Of Friction Testing Techniques For the Friction Chmentioning

confidence: 99%

Section: Selection Of Friction Testing Techniques For the Friction Chmentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

Identification of a friction model for the bearing channel of hot aluminium extrusion dies by using ball-on-disc tests

Wang

Zhou

Duszczyk

et al. 2012

Tribology International

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“…As emphasized by the authors of [15], determining the friction coefficient in the sheet forming process is difficult, labour intensive and very costly, because many factors affect friction mechanisms, and thus the obtained results. The experimental studies presented in the literature [16][17][18], using methods that reflect the process conditions, are aimed at searching for new lubricants with improved tribological properties, and also safe for the environment. Most of the applied lubricants are not only harmful to the environment but are also difficult or even impossible to completely remove from the product [11,19].…”

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confidence: 99%

The Effects Of Friction On Stamping Process Of Sheet Metals Used In Aviation

Dyja¹,

Więckowski²

2015

Archives of Metallurgy and Materials

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IntroductionIn addition to the existing trend towards the development of lightweight and durable materials used in aviation, there is the desire to design and manufacture aircraft structures of sheet metal. Among the various production techniques, only sheet-metal forming enable the production of thin-walled components with high strength [1][2][3][4]. According to [5,6], the tribological properties of the deformed materials and the friction conditions are important factors determining the results of sheet metal forming, particularly in the deep drawing process. Friction increases the drawing force, and as a result deteriorating energy efficiency of the process. High friction resistance at the blank holder -blank -die interface causes a rise in the drawing force and increases the risk of cracking of the drawn part, which has particular significance in forming sheets of small thickness [7]. Additionally, friction has an impact on the strains distribution in the drawn part as well as on the changes in the thickness of its walls [8].The negative effects of frictional forces are uneven strain, temperature rise in the workpiece -tool interface and lubrication deterioration, which in turn affects the quality of the drawn parts and tool life. The set of tribological processes occurring during formation in the tool contact zone, including mechanical and adhesional friction surface interaction as An important factor in the possibility of obtaining correct drawn parts with the desired functional properties is the friction between the stamped sheet and the tool.The article discusses the impact of technological lubricants developed according to our own formulas, based on vegetable oils, on the stamping process taking into account the strain distributions in the drawn parts. Biodegradable lubricants based on rapeseed oil with an addition of stearic acid or boric acid were used. The results of the friction coefficient in a strip drawing test and the numerical analysis results of the stamping process of a spherical cap from sheet metal: aluminium 2024, commercially pure titanium Grade 2, steel 5604 in dry friction and lubrication conditions, are presented. Strain distributions and changes in the drawn part wall thickness were analysed.

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Galling resistance evaluation of tool steels by two different laboratory test methods for sheet metal forming

Karlsson

Eriksson

Gåård

et al. 2012

Lubrication Science

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Adhesive accumulation of work material on the tool surface is today a major problem in many sheet metal‐forming applications. Different laboratory test methods are used to investigate galling with respect to different tool materials, lubricants and process conditions. In the present study, the galling resistance of a modern nitrogen‐alloyed powder metallurgy tool steel and an conventional ingot cast D2 type tool steel was evaluated under lubricated sliding against ferritic stainless steel sheets using a commercial pin‐on‐disc (POD) and an in‐house made slider‐on‐flat‐surface (SOFS) tribotester. The investigated tool steels ranked similarly in terms of galling resistanc in both test methods. However, sliding distances to galling were longer for the SOFS equipment due to continuous sliding on new lubricated sheet surface. Best performance was demonstrated by the powder metallurgy tool steel treated to 65 HRC. Differences in friction behaviour and galling initiation were analysed on the basis of the two different working conditions, i.e. open (SOFS) and closed (POD) tribosystems. Copyright © 2012 John Wiley & Sons, Ltd.

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Lubricant test methods for sheet metal forming

Cited by 117 publications

References 24 publications

Identification of a friction model for the bearing channel of hot aluminium extrusion dies by using ball-on-disc tests

Identification of a friction model for the bearing channel of hot aluminium extrusion dies by using ball-on-disc tests

The Effects Of Friction On Stamping Process Of Sheet Metals Used In Aviation

Galling resistance evaluation of tool steels by two different laboratory test methods for sheet metal forming

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