Size effects of micro drilling in steel

Klocke, Fritz; Gerschwiler, Klaus; Abouridouane, Mustapha

doi:10.1007/s11740-008-0144-y

Cited by 45 publications

(16 citation statements)

References 7 publications

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“…Besides high achievable form accuracy and low surface roughness, high flexibility concerning the texture and structure geometry is achievable. Nevertheless, due to the small structure dimensions size effects have to be considered with regard to the material properties [5,6]. Fig.…”

Section: Introductionmentioning

confidence: 99%

Advanced microstructures and its production through cutting and grinding

2010

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Section: Introductionmentioning

confidence: 99%

Advanced microstructures and its production through cutting and grinding

2010

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“…Two different diameters (0.5 and 0.27 mm) of HSS DIN 1899 drill bits (Sphinks, Derendingen, Switzerland) were used in the experimental campaign. The choice of the two drill diameters considered that, when moving from macro-to microscale processing, the drill's core in proportion to the diameter is larger for smaller diameter tools in order to give them strength, which causes the chisel edge's length to increase and influences the micro-drilling process reactions [26,27]. In other words, when the drill bit diameter becomes small, the process becomes more like a deep drawing process.…”

Section: Micro-drilling Processmentioning

confidence: 99%

Poly(methyl methacrylate) Coating of Titanium Workpieces to Reduce Burrs in Micro-drilling

Giorleo

2019

Micromachines

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A technique to reduce burr height in titanium micro-drilling is presented: a poly (methyl methacrylate) coating was applied before machining on the upper and lower surfaces of a titanium specimen (0.5-mm thick). After drilling, a cleaning process (acetone bath) was executed to eliminate the coating, and holes with less burr were obtained. The coating process was executed with a spin-coating machine. To test the efficacy of the technique, two different coating thicknesses (7.9 and 5.4 µm) and two drill bits (0.25-and 0.5-mm diameter) were evaluated. Qualitative and quantitative analyses of the holes obtained were performed with scanning electron microscopy and three-dimensional microscopy, respectively. The results highlight the efficacy of the technique to reduce the burr height by 70% in coated titanium relative to that in an uncoated titanium sheet.

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“…To compare the obtained micro drilling results of this work with earlier macro drilling tests (d = 1 -3 mm and the same twist geometry) in the normalized steel C45 [23], the related feed force and torque to the cross section of the uncut chip (d•f/2) are plotted versus drill diameters between 50 µm und 3 mm in Fig. 8.…”

Section: Prediction Of Size Effect Of Drill Micro Geometrymentioning

confidence: 99%

“…Most developed cutting models which are based on assumptions such as relative sharp tool edge radius and homogenous materials cannot be simply applied to micro cutting operations due to the above mentioned size effects. Especially, micro cutting of multiphase materials results in significantly varying cutting mechanisms and associated process response [23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Microstructure-Based 3D FE Modeling for Micro Cutting Ferritic-Pearlitic Carbon Steels

Abouridouane

Klocke

Lung

2014

Volume 1: Materials; Micro and Nano Technologies; Properties, Applications and Systems; Sustainable Manufacturing

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The mechanics of the cutting process on the microscopic level differ fundamentally from the conventional macro cutting. For example, the tool edge radius influences the cutting mechanism in micro machining significantly with regard to the effective rake angle, the minimum chip thickness, the dominance of ploughing, and the related elasto-plastic deformation of the workpiece material. These phenomena, known as size effects, have a profound impact on the cutting force, process stability, and resulting surface finish in micro cutting. Therefore, microstructural effects in microscale cutting require quite different assumptions to be made concerning underlying material behaviour during micro cutting and have led to the need for new modeling approaches to account for such effects. This paper presents a three-dimensional finite element approach to incorporate microstructure into micro cutting simulation based on the concept of a representative volume element (RVE) and constitutive material modeling as well as using the Lagrangian formulation proposed in the implicit FE code Deform 3D™. Micro drilling and micro milling tests using solid carbide tools with different diameters (d = 50 μm − 1 mm) were performed on ferrite-pearlite two-phase steel AISI 1045 for the verification of the developed 3D multiphase FE computation model regarding chip formation, feed force, and torque. The developed 3D multiphase FE model was successfully used to predict size effects in micro cutting.

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Size effects of micro drilling in steel

Cited by 45 publications

References 7 publications

Advanced microstructures and its production through cutting and grinding

Advanced microstructures and its production through cutting and grinding

Poly(methyl methacrylate) Coating of Titanium Workpieces to Reduce Burrs in Micro-drilling

Microstructure-Based 3D FE Modeling for Micro Cutting Ferritic-Pearlitic Carbon Steels

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