Tribological behaviour of DLC-films and their application in micro deep drawing

Hu, Zhenyu; Schubnov, Alexej; Vollertsen, Frank

doi:10.1016/j.jmatprotec.2011.10.012

Cited by 65 publications

(31 citation statements)

References 8 publications

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“…DLC coating was proven to be an efficient way to reduce friction in microforming as shown by the work of Hu et al [67] using micro deep drawing experiment and Wang et al [68] in the case of strip drawing. Surface texturing of the die was proposed by Brinksmeier et al [69] as another mean to control friction in sheet microforming applications and therefore prolong die life.…”

Section: Critical Issues Particular To Microformingmentioning

confidence: 99%

Tool Wear and Life Span Variations in Cold Forming Operations and Their Implications in Microforming

et al. 2016

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Abstract:The current paper aims to review tooling life span, failure modes and models in cold microforming processes. As there is nearly no information available on tool-life for microforming the starting point was conventional cold forming. In cold forming common failures are (1) over stressing of the tool; (2) abrasive wear; (3) galling or adhesive wear, and (4) fatigue failure. The large variation in tool life observed in production and how to predict this was reviewed as this is important to the viability of microforming based on that the tooling cost takes a higher portion of the part cost. Anisotropic properties of the tool materials affect tool life span and depend on both the as-received and in-service conditions. It was concluded that preconditioning of the tool surface, and coating are important to control wear and fatigue. Properly managed, the detrimental effects from surface particles can be reduced. Under high stress low-cycle fatigue conditions, fatigue failure form internal microstructures and inclusions are common. To improve abrasive wear resistance larger carbides are commonly the solution which will have a negative impact on tooling life as these tend to be the root cause of fatigue failures. This has significant impact on cold microforming.

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Section: Critical Issues Particular To Microformingmentioning

confidence: 99%

Tool Wear and Life Span Variations in Cold Forming Operations and Their Implications in Microforming

et al. 2016

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“…The research done by Hu et al [34] has shown that the coating of DLC-film on tooling surface can significantly decrease the friction force in micro deep drawing process. Gong et al [35] conducted the micro deep drawing experiment using different lubricants, viz., polyethylene (PE) film, soybean oil and castor oil.…”

Section: Interfacial Frictionmentioning

confidence: 99%

Microforming Processes

Chan

2014

Springer Series in Advanced Manufacturing

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“…The DLC (diamond-like carbon) film, one of the lubricants, was found to decrease the drawing force and to increase the LDR (limit drawing ratio) of the material (Gong et al, 2011;Hu et al, 2012). Otherwise, Zheng et al (2013) observed the forming load required to perform modeling, and also analyzed the dry friction in micro-forming.…”

Section: Introductionmentioning

confidence: 99%

Punch Force Behavior during Micro V-Bending Process of the Copper Foil

Kiswanto¹,

Mahmudah

Priadi³

2017

IJTech

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Sheet metal bending is defined as a straining process of flat strip material around a linear axis. The micro V-bending process was conducted to investigate its punch force behavior with 0.1 mm thick copper foil. The V-shaped configuration of the punch and die provides a simplicity of tools and an ability to produce different bending angles with a single tool. During the straining of material, a unique force profile, which is related to punch trajectory, occurs. The process was performed with the punch speeds 0.5 mm/s, 1.0 mm/s, 5.0 mm/s and 10.0 mm/s. The results showed that the punch force profile consists of the free-bending stage and the coin-bending stage. In the free-bending stage, the force magnitude was not influenced by the punch speed for the same geometrical and mechanical properties of the sheet material. Furthermore, during the coin-bending stage, the force magnitude increased significantly since the material needed to be bottomed.

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Tribological behaviour of DLC-films and their application in micro deep drawing

Cited by 65 publications

References 8 publications

Tool Wear and Life Span Variations in Cold Forming Operations and Their Implications in Microforming

Tool Wear and Life Span Variations in Cold Forming Operations and Their Implications in Microforming

Microforming Processes

Punch Force Behavior during Micro V-Bending Process of the Copper Foil

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