A theoretical and experimental study of friction in metal forming by the use of the forward extrusion process

Bakhshi-Jooybari, Mohammad

doi:10.1016/s0924-0136(02)00343-6

Cited by 59 publications

(29 citation statements)

References 8 publications

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“…Forward extrusion of pure aluminum with 1.2344 tool steel could be realized under laboratory conditions. 7 But the results were not transferable to workpiece materials with higher strength, such as steels. Subsequently, various coating systems were tested to counteract wear issues.…”

Section: State Of Researchmentioning

confidence: 99%

Dry metal forming: Definition, chances and challenges

Vollertsen

Schmidt

2014

Int. J. of Precis. Eng. and Manuf.-Green Tech.

109

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In metal forming, lubricants are still used to prevent corrosion, to reduce friction, wear and tool load as well as to protect the workpieces and intermediates. In economic and ecological points of view, the challenge is the avoidance of lubricant usage. Within this article we define the term of dry metal forming, a technology which contributes an approach to establish green technology in mass production. Regarding this, the benefits of this technology are shown. Three different approaches exist to achieve a dry forming process: ceramic tools, self-lubricating coating systems and hard material coatings. Concerning this matter, the state of research in dry metal forming is reviewed within this paper.

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Section: State Of Researchmentioning

confidence: 99%

Dry metal forming: Definition, chances and challenges

Vollertsen

Schmidt

2014

Int. J. of Precis. Eng. and Manuf.-Green Tech.

109

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“…It was found that many practical problems in the hot extrusion industry, such as wear of the extrusion dies [1][2][3][4], surface quality of the extruded profiles [5], die lines and pick up [6] etc., are related to the strong adhesion between the hot aluminium and the die due to strong chemical and atomic interactions between hot aluminium and steel, which is the main reason for the excessively high friction observed during hot aluminium extrusion [1][2][3]7]. 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 3 In the past years, efforts have been made to study the tribological phenomenon of the extrusion process and the developed friction testing techniques can be classified as three different groups, namely, field tests; simulative tests (or physical simulation tests) and tribological tests.…”

Section: Introductionmentioning

confidence: 99%

“…stress transmitting pins [13] have been used to measure the pressure distribution on the die face during hot aluminium extrusion. Extrusion friction tests for extrudate/bearing interface [4,14,15] was used to characterize friction in the bearing channel of extrusion dies, in which a transition from full sticking to sliding was experimentally observed and the friction coefficients were therefore determined from the lengths of sticking and sliding zones [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

“…These tests were designed with highlighted friction sensitivity indicated by extrudate lengths, and the lubricants can be evaluated and the global friction coefficient or factor on the workpiece/tooling interface can be determined quantitatively with the aid of FE simulations. On the other hand, the friction coefficients/factors over the container wall can be estimated based on the friction effects on the extrusion load [4,5]. Table 1 shows a summary of the friction test results obtained from extrusion friction tests.…”

Section: Introductionmentioning

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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“…The experimental approach was mostly taken to determine the friction coefficient at the billet/container interface from the difference in extrusion force due to a change in friction force at this interface during extrusion [6][7][8]. Using a similar approach, Flitta and Sheppard [9] revealed the dependence of friction coefficient at the billet/ container interface on temperature during the aluminium extrusion process at elevated temperatures.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of the Friction Between Aluminium and Steel at Elevated Temperatures During Ball-on-Disc Tests

et al. 2009

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Appropriate specification of the frictional boundary condition for the finite-element (FE) simulation of metal-forming processes is of great importance to the trustworthiness of the results. The research reported in this communication aimed at understanding the interfacial contact between aluminium and steel at elevated temperatures and determining friction coefficients at this material mating. A series of high-temperature ball-on-disc tests were carried out with the AA7475 aluminium alloy as the material of disc and the hardened H11 steel as the material of ball. A mathematical model developed in the preceding research was employed to account for the evolution of the contact interface during ball-on-disc tests. Friction coefficients at different temperatures and over a number of laps were determined. The shear friction stresses and mean contact pressures along with the progress of the tests at 350-500°C were calculated. It was found that the friction coefficients obtained from ball-on-disc tests alone were insufficient to represent the frictional interaction between deforming aluminium and steel at elevated temperatures. The evolution of the contact interface with increasing sliding distance must be taken into consideration and the friction behaviour can be reasonably characterized by using friction stress.

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A theoretical and experimental study of friction in metal forming by the use of the forward extrusion process

Cited by 59 publications

References 8 publications

Dry metal forming: Definition, chances and challenges

Dry metal forming: Definition, chances and challenges

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

Characteristics of the Friction Between Aluminium and Steel at Elevated Temperatures During Ball-on-Disc Tests

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