Abstract
In spatial micro-fabrication on metallic surface, the mechanical machining consumes material shear deformation energy, while the laser machining energy is greatly converted into material melting heat energy. In production, the micron-scale material-removal machining requires the CNC system to long-time tool path interpolation for high energy-consumption. According to dynamics and kinematics of metallic plastic deformation, a strain energy transfer is proposed to deform micro-topographic shapes by differentiated surface stress. The objective is to realize the precision forming of spatial microstructure surface through the strain energy conversion and conservation. First, the energy transfer and strain variations were modelled in relation to die curvature radius, workpiece thickness, initial microstructure angle and depth. Then, the strain energy consumption was investigated in relation to material properties, die movement, and micro dimensions. Finally, it was applied to industrial cold-pressing. It is shown that the strain energy of a single microstructure formation transfers from centre to outer part. The spatial microstructure forming may change from diversified strain stage to uniform strain state with the highest energy efficiency at a critical strain energy, while the surface roughness remains unchanged. Under the strain energy transfer, the microstructure shape changes with increasing energy consumption to a critical value. The metal compressive strength, die curvature radius and workpiece thickness promotes energy consumption, while descending velocity promotes processing efficiency. By controlling the energy conversion, the spatial microstructure sizes may be fabricated with an error of about 1.0% and the energy consumption of about 10 mm3/J. In industrial production, it contributes high energy efficiency without coolant pollutant in contrast to mechanical machining and laser machining. As a result, the strain energy conversion and conservation may be regarded as an evaluation for an eco-friendly micro-fabrication.
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Abbreviations
- a :
-
Semi-major axes (mm)
- a p :
-
Cutting depth (μm)
- b :
-
Semi-minor axes (mm)
- d :
-
Spatial microgroove depth (μm)
- d 0 :
-
Initial microgroove depth (μm)
- d m :
-
Microstructural dimension (μm)
- d tar :
-
Target microgroove depth (μm)
- d z :
-
Vertical displacement of point (mm)
- e c :
-
Mean centre deviation (μm)
- e d :
-
Formation errors of spatial microgroove depth (μm)
- e d 0 :
-
Machining error of initial microgroove depth in grinding (μm)
- e α :
-
Formation errors of spatial microgroove angle (°)
- e α 0 :
-
Machining errors of initial microgroove angle in grinding (°)
- E b :
-
Critical strain energy consumption (J)
- E c :
-
Errors between the macro curvature radii of upper die and microgrooves (μm)
- E de :
-
Angle variation per unit energy consumption (°/J)
- E l :
-
Elasticity modulus (GPa)
- E m :
-
Maximum strain energy consumption (J)
- E n :
-
Strain energy consumption (J)
- E r :
-
Material consumption per unit energy consumption (mm3/J)
- E s :
-
Strain energy of a single microgroove
- F :
-
Loading force (kN)
- F b :
-
Critical pressing force (kN)
- F m :
-
Maximum loading force (kN)
- G :
-
Shear modules (GPa)
- \(\overline{K }\Delta \alpha\) :
-
Angle variation of orthogonal test results (°)
- \(\overline{K }\Delta d\) :
-
Depth variation of orthogonal test results (μm)
- K m :
-
Material coefficient
- N :
-
Wheel speed (rpm)
- R :
-
Workpiece curvature radius (mm)
- R 0 :
-
Die curvature radius (mm)
- R a :
-
Mean surface roughness (nm)
- \({R}_{\overline{K}\Delta d }\) :
-
Range of depth variation in experiment (μm)
- \({R}_{\overline{K}{\Delta d }^{*}}\) :
-
Range of depth variation in simulation (μm)
- \({R}_{\overline{K}\Delta \alpha }\) :
-
Range of angle variation in experiment (°)
- \({R}_{\overline{K}{\Delta \alpha }^{*}}\) :
-
Range of angle variation in simulation (°)
- t a :
-
Processing time per unit area (s/mm2)
- v :
-
Descending velocity (mm/s)
- v f :
-
Feed rate (mm/min)
- v z :
-
Vertical velocity of point (mm/s)
- z :
-
Upper die displacement (mm)
- z b :
-
Critical displacement in experiment (mm)
- z b * :
-
Critical displacement in simulation (mm)
- z s :
-
Critical shearing displacement (mm)
- α :
-
Spatial microgroove angle (°)
- α 0 :
-
Initial microgroove angle (°)
- α tar :
-
Target microgroove angle (°)
- δ 0 :
-
Workpiece thickness (mm)
- δ c :
-
Applicable thickness range (mm)
- Δd :
-
Microgroove depth variation in experiment (μm)
- Δd * :
-
Microgroove depth variation in simulation (μm)
- Δα :
-
Microgroove angle variation in experiment (°)
- Δα * :
-
Microgroove angle variation in simulation (°)
- μ :
-
Poisson ratio
- ρ :
-
Density (g/cm3)
- σ 0 .2 :
-
Yield strength (MPa)
- σ b :
-
Compressive strength (MPa)
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (51975219) and (52375493), the Basic and Applied Basic Research Foundation of GuangDong Province (2022A1515220053).
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Chen, Z., Xie, J., He, Q. et al. Study on Strain Energy Transfer and Efficiency in Spatial Micro-forming of Metal. Int. J. of Precis. Eng. and Manuf.-Green Tech. 11, 407–425 (2024). https://doi.org/10.1007/s40684-023-00560-1
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DOI: https://doi.org/10.1007/s40684-023-00560-1