Introduction

Stachowiak, Gwidon; Batchelor, Andrew W.

doi:10.1016/b978-075067836-0/50002-x

Cited by 93 publications

(149 citation statements)

References 6 publications

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“…This contributes to lower friction and prevents lubricant film breakdown. The additives in the Rhenus oils furthermore prevent these oils from decomposition and vaporization [23]. improvements were noted on the drawing load when testing tool textures at the lower speed (65 mm/s, Figure 7), the rest of the discussion is focused on the tool texture at larger speed (240 mm/s, Figure 8).…”

Section: Resultsmentioning

confidence: 99%

“…This contributes to lower friction and prevents lubricant film breakdown. The additives in the Rhenus oils furthermore prevent these oils from decomposition and vaporization [23]. Figure 11 shows images of the tool surface using light optical microscope and scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM/EDX)(SEM is from JEOL, Tokyo, Japan; EDX is from Oxford Instruments, Abingdon, UK), utilized to observe possible pick-up of workpiece material on the tool surface in the contact region.…”

Section: Resultsmentioning

confidence: 99%

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The Influence of Tool Texture on Friction and Lubrication in Strip Reduction Testing

2017

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While texturing of workpiece surfaces to promote lubrication in metal forming has been applied for several decades, tool surface texturing is rather new. In the present paper, tool texturing is studied as a method to prevent galling. A strip reduction test was conducted with tools provided with shallow, longitudinal pockets oriented perpendicular to the sliding direction. The pockets had small angles to the workpiece surface and the distance between them were varied. The experiments reveal that the distance between pockets should be larger than the pocket width, thereby creating a topography similar to flat table mountains to avoid mechanical interlocking in the valleys; otherwise, an increase in drawing load and pick-up on the tools are observed. The textured tool surface lowers friction and improves lubrication performance, provided that the distance between pockets is 2-4 times larger than the pocket width. Larger drawing speed facilitates escape of the entrapped lubricant in the pockets. Testing with low-to-medium viscosity oils leads to a low sheet roughness on the plateaus, but also local workpiece material pick-up on the tool plateaus. Large lubricant viscosity results in higher sheet plateau roughness, but also prevents pick-up and galling.

show abstract

Section: Resultsmentioning

confidence: 99%

“…This contributes to lower friction and prevents lubricant film breakdown. The additives in the Rhenus oils furthermore prevent these oils from decomposition and vaporization [23]. Figure 11 shows images of the tool surface using light optical microscope and scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM/EDX)(SEM is from JEOL, Tokyo, Japan; EDX is from Oxford Instruments, Abingdon, UK), utilized to observe possible pick-up of workpiece material on the tool surface in the contact region.…”

Section: Resultsmentioning

confidence: 99%

The Influence of Tool Texture on Friction and Lubrication in Strip Reduction Testing

2017

View full text Add to dashboard Cite

show abstract

“…This contributes to lower friction and prevents lubricant film breakdown. The additives in the Rhenus oils furthermore prevent these oils from decomposition and vaporization [23]. Figure 11 shows images of the tool surface using Light Optical Microscope (LOM) and Scanning Electron Microcopy with energy dispersive X-ray spectroscopy (SEM/EDX), utilized to observe possible pick-up of workpiece material on the tool surface in the contact region.…”

Section: Resultsmentioning

confidence: 99%

The Influence of Tool Texture on Friction and Lubrication in Strip Reduction Testing

Sulaiman¹,

Christiansen²,

Bay³

2016

Preprint

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While texturing of workpiece surfaces to promote lubrication in metal forming has been applied for several decades tool surface texturing is rather new. In the present paper tool texturing is studied as a method to prevent galling. Adopting a strip reduction test longitudinal pocket geometries oriented perpendicular to the sliding direction, with shallow pocket depth, small pocket angle to the workpiece surface and varying distance between pockets are investigated. The experiments reveal that the distance between pockets should be larger than the pocket width thereby creating a topography similar to flat table mountains to avoid mechanical interlocking in the valleys; otherwise an increase in drawing load and pick-up on the tools is observed. The textured tool surface lowers friction and improves lubrication performance provided that the distance between pockets is 2-4 times larger than the pocket width. Larger drawing speed facilitates escape of the entrapped lubricant in the pockets. Testing with low to medium viscosity oils leads to a low sheet roughness on the plateaus but also local workpiece material pick-up on the tool plateaus. Large lubricant viscosity results in higher sheet plateau roughness but also prevents pick-up and galling.

show abstract

“…Either film failure or absence of a film can cause severe friction and wear [1,2] and eventual failure of the bearing. Either film failure or absence of a film can cause severe friction and wear [1,2] and eventual failure of the bearing.…”

Section: Introductionmentioning

confidence: 99%