A study on galling initiation in friction coupling stretch bending with advanced high strength hot-dip galvanized sheet

Wang, Wurong; Wang, Kai; Zhao, Yuyuan; Hua, Meng; Wei, Xicheng

doi:10.1016/j.wear.2015.02.058

Cited by 10 publications

(5 citation statements)

References 21 publications

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“…Galling occurs when the Zn particles attach to the tool surface and form lumps that subsequent scratch the surface of the coated sheet metal. Different test set ups are used to investigate the galling mechanism in sheet metal forming, such as the strip draw test, bending over a radius, slider on sheet test [1,2], friction coupling bending [3], Twist compression test [4,5] or benchmark parts. Each of these test set ups have their own pro's and con's related to necessary amount of tests, deformation or only sliding, etc.…”

Section: Introductionmentioning

confidence: 99%

Slider on Sheet Tester Development for Characterizing Galling

Venema

Korver

Chezan

2022

KEM

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The overwhelming majority of automotive part manufacturing processes successfully process hot dip galvanized sheet metal. However, there were reported situations were abrasive wear (galling), visible as narrow and long scratches, was observed on the surface of the formed parts. Investigations using a Slider On Sheet Tester (SOST) were performed in order to determine the conditions that lead to scratch forming on the galvanized sheet metal surface and to identify parameters that would guarantee a scratch free situation. The tests identified the tool roughness and the contact pressure as important parameters governing the coating wear phenomena. The tests proved that the coating resists relative high contact conditions in case of smooth tool surface, explaining why in the large majority of the industrial applications coated materials can be used without issues.

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Section: Introductionmentioning

confidence: 99%

Slider on Sheet Tester Development for Characterizing Galling

Venema

Korver

Chezan

2022

KEM

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“…A custom tribo-tester (Figure 1(a)), with design and operations to be detailed in [20], was used to perform relevant tests for the evaluation of galling initiation. Stretch bending condition can be simulated with the tester by: (i) suitably adjusting the DC53 mould steel pressure head in the forming tool bracket (see: mid-span in the system in Figure 1(b)) down to certain position below horizontal level; and (ii) applying a load on the hanger connected to the end of string wrapping over the shiftable pulley (see: far right in the system in Figure 1(b)).…”

Section: Materials and Experimentsmentioning

confidence: 99%

“…For the sheet specimen with 0% plastic deformation, it can be seen that the rate of increase in Δ R y was slower comparatively with 7 and 15% deformation counterparts. The individual tests in this study were aborted at the slid distance when Δ R y was raised to the critical value of galling initiation of about 8 µm [20]. Shortest slid distance coverage was about 7200 and 5600 mm for the test with 7 and 15% deformation, respectively.…”

Section: Galling Between Quenched/tempered Mould and Sheetmentioning

confidence: 99%

Developing of galling during the forming and its improvement by physical vapour depositing

Zhou

Gao

Zheng

et al. 2018

Surface Engineering

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In sheet metal stamping, galling is initiated and developed aggressively at the mould radius, where sheet metal undergoes large plastic deformation. This study sheds light on correlating the level of sheet plastic deformation with galling initiation on the mould surface. The 3D topography facilitated the observation of galling evolution process on the surface of quenched/tempered mould. The observation on the sliding sheet counterpart showed that with larger plastic deformation, zinc-coated surface tended to become rough and a large number of intermittent micro-cracks formed, leading to earlier initiation of galling. Furthermore, the surface of mould was treated by physical vapour depositing (PVD) of CrN. In the specific sliding tests under the same level of plastic deformation, critical total slid distance at which galling initiated was increased significantly. The major factor causing galling initiation on the PVD(CrN)-coated mould was identified.

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“…Other parameters which influence galling are sheet surface, design (deformation) and process parameters such as pressure, velocity and temperature. In the literature investigations on the mechanisms of galling and the influence of several parameters can be found [2][3][4][5]. For example, Van de Heide and Dane [6][7] investigated the influence of lubricant on galling.…”

Section: Introductionmentioning

confidence: 99%

Surface topography effects on galling of hot dip galvanized sheet metal

VENEMA¹

2023

Materials Research Proceedings

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Abstract. During manufacturing of automotive parts from hot dip galvanized sheet metal, surface asperities of the forming tools can cause breakage of small coating particles. Long and narrow scratches appear on the surface of the form part, a phenomenon known as part surface galling. Laboratory testing using a slider on sheet tests (SOST) are performed in order to investigate surface topography effects on galling. These experiments reveal the dominant effect of tool surface roughness on galling. The tool surface roughness has a large effect on the size of the detached coating particles and the distance before scratch occurrence. If the tool roughness is low enough, no surface scratch formation is observed for the investigated range of sheet surface roughness. At a high tool surface roughness scratches are observed at a very short sliding distance for all tested materials. At an intermediate tool surface roughness, the materials selected for this investigation show measurable differences but no clear trend could be identified.

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A study on galling initiation in friction coupling stretch bending with advanced high strength hot-dip galvanized sheet

Cited by 10 publications

References 21 publications

Slider on Sheet Tester Development for Characterizing Galling

Slider on Sheet Tester Development for Characterizing Galling

Developing of galling during the forming and its improvement by physical vapour depositing

Surface topography effects on galling of hot dip galvanized sheet metal

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