Fractal analysis of surface topography in ground monocrystal sapphire

Wang, Qiuyan; Liang, Zhiqiang; Wang, Xibin; Zhao, Wenxiang; Wu, Yongbo; Zhou, Tianfeng

doi:10.1016/j.apsusc.2014.11.093

Cited by 32 publications

(16 citation statements)

References 34 publications

(34 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…(Raymond et al, 2016) investigated wear resistant properties of abrasive filament tools by analyzing different surface functional parameters. (Wang et al, 2015) showed a correlation between average roughness (Ra) and fractal dimension (Ds). investigated hard turned, ground and honed surfaces and found that cavities or peaks are attributes to fluid retention ability and to wear resistance.…”

Section: Introductionmentioning

confidence: 99%

Evaluation and systematic selection of significant multi-scale surface roughness parameters (SRPs) as process monitoring index

Das

Linke

2017

Journal of Materials Processing Technology

View full text Add to dashboard Cite

The evaluation of multi-scale surface roughness parameters (SRPs) is important to solve many engineering problems (e.g. contact stress, sealing, friction) and is closely related to further fundamental problems (e.g. microbial contamination). Traditionally, surface roughness has been used as a standard for indicating process performance, such as tool wear, tool vibration etc. This paper also aims to find appropriate surface roughness parameters (SRPs) that can be used as process monitoring indices. Grade 304 stainless steel surfaces, generated by extrusion and grinding processes, were used in this study. The evaluation of different SRPs and their topography properties (such as fractal dimension) is discussed for extruded and ground surfaces.One problem with existing surface metrology is the availability of a multitude of disconnected roughness parameters. A statistical approach is presented in this paper that allows the most appropriate roughness parameters to monitor whether the intended surface quality converges to be found.

show abstract

Section: Introductionmentioning

confidence: 99%

Evaluation and systematic selection of significant multi-scale surface roughness parameters (SRPs) as process monitoring index

Das

Linke

2017

Journal of Materials Processing Technology

View full text Add to dashboard Cite

show abstract

“…Moreover, conventional evaluation methods of surface topography, such as statistical parameter Ra, strongly depend on actually sampling and the scan lengths, and cannot evalute the surface quality precisely in the meso-scale [ 21 ]. However, many machined surfaces, such as those processed by turning, drilling, and grinding, which have the property of self similarity or self-affinity, can be characterised with fractal geometry [ 22 ].…”

Section: Drilling Experiments Of Helical Point Micro-drill With Difmentioning

confidence: 99%

“…The fractal dimension is more effective to evaluate the surface quality than the conventional method at the meso-scale [ 23 ]. Therefore, in this paper, the hole wall quality are evaluated with fractal dimension D L generated by the 2D box counting method shown in Figure 12 b and discussed in the literature [ 21 ]. The equation of fractal dimension D L is:

where, N ( r ) is the minimal number of boxes covering the fractal object, and r is the size of the box.…”

Section: Drilling Experiments Of Helical Point Micro-drill With Difmentioning

confidence: 99%

Research on the Drilling Performance of a Helical Point Micro Drill with Different Geometry Parameters

et al. 2017

Self Cite

View full text Add to dashboard Cite

During the micro-drilling process of stainless steel, the wear, fracture, and breakage of the micro-drill easily occur. Micro-drill geometry parameters have significant influence on the drilling performance of the micro-drill. Nowadays, the helical point micro-drill is proposed and its improved drilling performance is validated by some researchers. In this study, to analyze the effect of geometry parameters of the helical point micro-drill on drilling performance, the mathematical models of the helical flank and ground flute are proposed, and the cutting lip shape, rake angle, and uncut chip thickness are calculated using MATLAB software. Then, based on the orthogonal tests, nine kinds of micro-drills with different point angles, web thicknesses, and helix angles are fabricated using a six-axis CNC tool grinder, and micro-drilling experiments on 1Cr18Ni9Ti stainless steel are carried out. The drilling force, the burr height, and the hole wall quality are measured and observed. The results show that the point angle is the main contributing factor for the thrust force and burr height, and the web thickness is the main contributing factor for the micro hole wall quality. The increased point angle offers a larger thrust force, but gives rise to a smaller exit burr. A larger web thickness leads to a larger thrust force and burr height, and results in a poor surface quality. With the helix angle increased, the thrust force and burr height decreases, and the surface quality of micro-hole improves. The geometry parameters with a point angle 70°, a point angle of 40°, and web thickness ratio of 0.2 can used to improve the drilling performance of the helical point micro-drill.

show abstract

“…Monocrystal sapphire has many applications in optics and electronic industries such as blue LED, infrared detectors, substrates for semiconductors, and superconductors as it has high strength, good electric insulation, and low dielectric loss [1,2]. It is a very inert material to the majority of wet chemicals and dry etching and has many limitations for laser ablation due to the thermal effects of laser processing [3].…”

Section: Introductionmentioning

confidence: 99%

Effect of Thermal Softening on Anisotropy and Ductile Mode Cutting of Sapphire Using Micro-Laser Assisted Machining

Mohammadi

Patten

2017

Journal of Micro and Nano-Manufacturing

View full text Add to dashboard Cite

Ceramics and semiconductors have many applications in optics, micro-electro-mechanical systems, and electronic industries due to their desirable properties. In most of these applications, these materials should have a smooth surface without any surface and subsurface damages. Avoiding these damages yet achieving high material removal rate in the machining of them is very challenging as they are extremely hard and brittle. Materials such as single crystal silicon and sapphire have a crystal orientation or anisotropy effect. Because of this characteristic, their mechanical properties vary significantly by orientation that makes their machining even more difficult. In previous works, it has been shown that it is possible to machine brittle materials in ductile mode. In the present study, scratch tests were accomplished on the monocrystal sapphire in four different perpendicular directions. A laser is transmitted to a diamond cutting tool to heat and soften the material to either enhance the ductility, resulting in a deeper cut, or reducing brittleness leading to decreased fracture damage. Results such as depth of cut and also nature of cut (ductile or brittle) for different directions, laser powers, and cutting loads are compared. Also, influence of thermal softening on ductile response and its correlation to the anisotropy properties of sapphire is investigated. The effect of thermal softening on cuts is studied by analyzing the image of cuts and verifying the depth of cuts which were made by using varying thrust load and laser power. Macroscopic plastic deformation (chips and surface) occurring under high contract pressures and high temperatures is presented.

show abstract

Fractal analysis of surface topography in ground monocrystal sapphire

Cited by 32 publications

References 34 publications

Evaluation and systematic selection of significant multi-scale surface roughness parameters (SRPs) as process monitoring index

Evaluation and systematic selection of significant multi-scale surface roughness parameters (SRPs) as process monitoring index

Research on the Drilling Performance of a Helical Point Micro Drill with Different Geometry Parameters

Effect of Thermal Softening on Anisotropy and Ductile Mode Cutting of Sapphire Using Micro-Laser Assisted Machining

Contact Info

Product

Resources

About