Manufacturing of surface microstructures for improved tribological efficiency of powertrain components and forming tools

Schubert, Andreas; Neugebauer, Reimund; Sylla, Diouldé; Avila, Mauricio; Hackert, M.

doi:10.1016/j.cirpj.2011.01.010

Cited by 21 publications

(7 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In the ECM domain, jet-ECM and through-mask ECM [7,8], as shown in Fig. 2 (a) and (b), are two frequently applied techniques, enabling the generation of the small cavities without edge lips or burs, and they have been successfully applied in tribology performance improvement [9,10]. As for these techniques, the diameter and the removal volume of the cavities change simultaneously during the electrochemical dissolution.…”

Section: Deterministic Removal For Cavity Machiningmentioning

confidence: 99%

Deterministic removal strategy for machine vision assisted scanning micro electrochemical flow cell

Guo

Qian

Reynaerts

2018

Journal of Manufacturing Processes

View full text Add to dashboard Cite

Small cavities on a sliding surface can improve lubrication performance, which has been verified by many researchers. Electrochemical machining (ECM) is an effective way to fabricate this kind of small cavities on a large scale. When the diameter and the removal volume for the cavities are specified, it is still required to efficiently determine the appropriate machining parameters. This paper presents a machine vision based control system for an ECM variant: the scanning micro electrochemical flow cell (SMEFC). The aim of this system is to control the diameter of the cavity in real-time. With the assistance of machine vision, fast acquisition of the machining parameters for the specified diameter and the specified removal volume is possible. The system configuration is first explained in detail, including hardware and software configuration and the image processing algorithms. The latter are based on the Shi-Tomasi corner detector and are used for feedback control, stability and symmetry evaluation of the electrolyte droplet. For convenience, all of these functions have been integrated into a self-developed unified G-code interface. Furthermore, the theoretical explanation for controlling the machining process by vacuum gap (VG) tuning has been investigated through a two-phase flow simulation model, which revealed how the VG influences the shear rate and the pressure difference near the meniscus. Finally, a case study shows how to use the proposed strategy to get suitable machining parameters for a cavity with a diameter of 900 μm and a target removal volume of 0.03 mm 3 . This demonstrates the availability of a deterministic removal strategy.

show abstract

Section: Deterministic Removal For Cavity Machiningmentioning

confidence: 99%

Deterministic removal strategy for machine vision assisted scanning micro electrochemical flow cell

Guo

Qian

Reynaerts

2018

Journal of Manufacturing Processes

View full text Add to dashboard Cite

show abstract

“…The quality of the tools affects the accuracy and mechanical properties of the formed parts. In order to overcome the harsh working conditions, hot forming tools should have high hardness to resist abrasive wear, the ability to prevent thermal shock, oxidation resistance properties and good load-bearing capacity to prevent plastic deformation [3].The purpose of this paper is to give a review on the application of the technologies investigated to improve the tribological efficiency of hot sheet metal forming tools. Firstly, the paper explores the surface modification technologies.…”

Section: Introductionmentioning

confidence: 99%

Application of surface modification technologies to improve performance of hot sheet metal forming tools: A review

Muvunzi¹,

Dimitrov²,

Matope³

et al. 2018

Proceedings of the EAI International Conference for Research, Innovation and Development for Africa

View full text Add to dashboard Cite

Hot sheet metal forming tools are exposed to severe operating conditions which cause adhesion, abrasive wear and fatigue. This causes a reduction in tool life and increased tool maintenance costs. On the other hand, the need for eco-friendly tools has arisen. Surface modification technologies have created opportunities in the tooling industry because of their capability to reduce the thermal and mechanical wear of hot sheet metal forming tools hence extending tool life. However, the technologies have some challenges which limit their wide application and there is need for further development. The purpose of this paper is to give a review on the application of surface modification technologies in hot sheet metal forming tools. The paper also discusses future research areas in the modification of tool surfaces to reduce wear and friction in hot sheet metal forming tools.

show abstract

“…Hot stamping is a relatively fast process if compared to other metal forming processes, so the manufacturing costs would be significantly increased if production has to be interrupted to premature and frequent changes of worn dies. To resist the severe working conditions of hot stamping, dies must present high hot hardness to minimize wear at high temperatures, low sensitivity to cracks caused by thermal shocks, low sensitivity to local tempering and softening, high mechanical strength to avoid mechanically induced cracks, low chemical affinity with the sheet alloy being stamped, and high oxidation resistance at high temperatures to avoid cracking by corrosion [2].…”

Section: Introductionmentioning

confidence: 99%

Tribological Behavior of Laser Textured Hot Stamping Dies

Shihomatsu

Button

Silva

2016

Advances in Tribology

View full text Add to dashboard Cite

Hot stamping of high strength steels has been continuously developed in the automotive industry to improve mechanical properties and surface quality of stamped components. One of the main challenges faced by researchers and technicians is to improve stamping dies lifetime by reducing the wear caused by high pressures and temperatures present during the process. This paper analyzes the laser texturing of hot stamping dies and discusses how different surfaces textures influence the lubrication and wear mechanisms. To this purpose, experimental tests and numerical simulation were carried out to define the die region to be texturized and to characterize the textured surface topography before and after hot stamping tests with a 3D surface profilometer and scanning electron microscopy. Results showed that laser texturing influences the lubrication at the interface die-hot sheet and improves die lifetime. In this work, the best texture presented dimples with the highest diameter, depth, and spacing, with the surface topography and dimples morphology practically preserved after the hot stamping tests.

show abstract

Manufacturing of surface microstructures for improved tribological efficiency of powertrain components and forming tools

Cited by 21 publications

References 16 publications

Deterministic removal strategy for machine vision assisted scanning micro electrochemical flow cell

Deterministic removal strategy for machine vision assisted scanning micro electrochemical flow cell

Application of surface modification technologies to improve performance of hot sheet metal forming tools: A review

Tribological Behavior of Laser Textured Hot Stamping Dies

Contact Info

Product

Resources

About