Abstract
Although it has long been known that tools with more negative rake angles allow the ductile regime when machining monocrystalline silicon, little has been discussed about the tool-material interaction. The microgeometric contact of the tool tip at this interface plays an essential role in the material remotion (ductile or brittle). In this paper, the tool rake angle was varied in order to change the value of the undeformed chip thickness once the tool cutting radius, formed in front of the tool rake face, changes when the tool rake angle becomes more negative. Based on the statistical design of the experiment applied to cutting tests, a map is built to relate the values of transition pressure in different crystallographic directions. This map assisted in determining the machining conditions with a ductile response into a broader spectrum based on the variation of the tool rake angle. The results obtained allowed to answer questions under which machining conditions and tool geometry account for better surface finishes, lower machining forces, and lower residual stresses. The response surfaces, from statistical design, provided answers capable of establishing under which cutting radii yielded more ductile material removal and avoided a brittle response related to the anisotropic behavior of the material. Finally, the brittle-to-ductile transition mapping determined a more suitable machining condition to diamond turn Fresnel lenses in single crystal silicon.
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The data sets generated and analyzed from the current study are available upon request from the corresponding author.
Code availability
The software application developed for the analysis of cutting forces is available on request from the corresponding author.
Abbreviations
- Rc:
-
Cutting radius (µm)
- α:
-
Tool rake angle (°)
- Rε:
-
Tool nose radius (µm)
- dc:
-
Depth of cut (µm)
- \({\mathrm{dc}}^{*}\) :
-
Critical depth of cut (µm)
- \({\mathrm{dc}}_{\mathrm{e}}\) :
-
Effective depth of cut (µm)
- \({{\mathrm{dc}}_{\mathrm{e}}}^{*}\) :
-
Critical-effective depth of cut (µm)
- \({\mathrm{dc}}_{110}^{*}\) :
-
Critical depth of cut in the direction [110] (µm)
- \({\mathrm{r}}_{\mathrm{e}}\) :
-
Cutting edge radius (nm)
- \(f\) :
-
Feedrate (µm/revolution)
- Fc:
-
Cutting force (N)
- Ft:
-
Thrust force (N)
- Ff:
-
Feed force (N)
- \({k}_{\mathrm{N}}\) :
-
Transition pressure (GPa)
- h:
-
Thickness of cutting (nm)
- \({\mathrm{h}}_{\mathrm{e}}\) :
-
Effective thickness of cutting (nm)
- \({\mathrm{h}}_{\mathrm{e}}^{*}\) :
-
Critical-effective thickness of cutting (nm)
- \({{\mathrm{h}}_{\mathrm{e}}}_{\mathrm{max}}\) :
-
Maximum-effective thickness of cutting (nm)
- \(h_{e110}^{*}\) :
-
Critical-effective thickness of cutting in the direction [110] (nm)
- As:
-
Cutting section area (µm2)
- \({\mathrm{As}}_{\mathrm{e}}\) :
-
Effective area of cutting section (µm2)
- Ra:
-
Arithmetic average of surface roughness (nm)
- Rq:
-
Root-mean-square surface roughness (nm)
- Rt:
-
Maximum height of the surface roughness (nm)
- C:
-
Safety factor
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Funding
The experiment has been performed in the Precision Engineering Laboratory (PEL) at the Department of Mechanical Engineering, School of Engineering of São Carlos, University of São Paulo, Brazil. The study was supported by Federal Institute of Education, Science and Technology of São Paulo (IFSP), and Brazilian grants from São Paulo Research Foundation (FAPESP), Education Ministry Foundation (CAPES), and National Council for Scientific and Technological Development (CNPq).
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Marcel Henrique Militão Dib: conceptualization, investigation, methodology, data curation, formal analysis, software for cutting forces, writing—original draft, visualization, validation. José Antonio Otoboni: methodology, validation, writing—review and editing. Renato Goulart Jasinevicius: supervision, conceptualization, methodology, resources, validation, investigation, data curation, writing—review and editing.
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Highlights
• Cutting forces used to show anisotropy effects with changes in crystallographic direction.
• Inverse relation between residual stress and cutting forces.
• Establish optimal surface finish condition as a function of the rake angle value.
• Negative rake angle increases cutting radius enhancing the critical thickness of cutting
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Militão Dib, M.H., Otoboni, J.A. & Jasinevicius, R.G. Mapping ductile-to-fragile transition and the effect of tool nose radius in diamond turning of single-crystal silicon. Int J Adv Manuf Technol 120, 843–867 (2022). https://doi.org/10.1007/s00170-021-08528-8
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DOI: https://doi.org/10.1007/s00170-021-08528-8