Micromachining Method for Surface Morphology

A special issue of Micromachines (ISSN 2072-666X). This special issue belongs to the section "D:Materials and Processing".

Deadline for manuscript submissions: closed (15 October 2021) | Viewed by 9703

Special Issue Editors


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Guest Editor
HiLASE Centre, Institute of Physics, Czech Academy of Sciences, Za Radnicí 828, 25241 Dolní Brežany, Czech Republic
Interests: laser materials processing; surface engineering; laser shock peening; laser annealing; additive manufacturing
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E-Mail Website
Guest Editor
HiLASE Centre, Institute of Physics, Czech Academy of Sciences, Za Radnicí 828, 25241 Dolní Brežany, Czech Republic
Interests: micromachining; precision engineering; surface engineering; micro-finishing/polishing; surface integrity
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear colleagues,

For several years, micromachining and precision finishing processes have been well developed and reported as methods for removing burrs, improving edge contour, and smoothing and polishing components. These methods are often used to facilitate safer part handling (by attenuating sharp part edges), enhance the fit and function of parts when installed, and create smooth, even micro-finished surfaces to satisfy either functional or aesthetic requirements or standards. This Special Issue aims to highlight the recent advancements in micromachining processes used for improving the surface morphology and important surface engineering aspects. Recent research and critical reviews are welcome to be the part of this Special Issue.

Topics include, but are not limited to, the following:

  • Laser micromachining and cutting of complex shaped components and features;
  • Precision machining;
  • Micro manufacturing and meso- and micro-scale additive manufacturing;
  • Micro-machining for biomedical industry;
  • Machining of micro-channels and pillars by spark erosion;
  • Laser, ultrasonic and abrasive water jet machining;
  • Precision machining of additive manufactured components;
  • Laser induced periodic surface structures in nanoscale;
  • Tribological effects of machining on the micro manufactured components;
  • Modelling and optimization of precision micro-machining and finishing for surface integrity enhancement;
  • Hybrid machining and finishing for micro and meso parts;
  • Micro- and nano-machining for MEMS;
  • Effects of precision micro-machining and finishing on geometric accuracy, tribology, and surface integrity of engineered parts engineering;
  • Precision machining and finishing of glass, ceramics, and non-metals, Micro/nano finishing of ultra-finished optical components.

Dr. Radhakrishnan Jagdheesh
Dr. Sunil Pathak
Guest Editors

Manuscript Submission Information

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Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Micromachines is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

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Published Papers (4 papers)

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Research

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10 pages, 3773 KiB  
Article
An Experimental Study of Micro-Dimpled Texture in Friction Control under Dry and Lubricated Conditions
by Yuan Wei, Jesus Resendiz, Robert Tomkowski and Xu Liu
Micromachines 2022, 13(1), 70; https://doi.org/10.3390/mi13010070 - 31 Dec 2021
Cited by 9 | Viewed by 2036
Abstract
Friction control is a vital technology for reaching sustainable development goals, and surface texturing is one of the most effective and efficient techniques for friction reduction. This study investigated the performance of a micro-dimpled texture under varying texture densities and experimental conditions. Reciprocating [...] Read more.
Friction control is a vital technology for reaching sustainable development goals, and surface texturing is one of the most effective and efficient techniques for friction reduction. This study investigated the performance of a micro-dimpled texture under varying texture densities and experimental conditions. Reciprocating sliding tests were performed to evaluate the effects of the micro-dimpled texture on friction reduction under different normal loads and lubrication conditions. The results suggested that a micro-dimpled texture could reduce the coefficient of friction (CoF) under dry and lubricated conditions, and high dimple density results in a lower CoF. The dominant mechanism of the micro-dimpled texture’s effect on friction reduction was discussed, and surface observation and simulation suggested that a micro-dimpled texture could reduce the contact area at the friction interface, thereby reducing CoF. Full article
(This article belongs to the Special Issue Micromachining Method for Surface Morphology)
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9 pages, 4763 KiB  
Article
Layer-by-Layer Repair of Small-Scale Damage of Fused Silica Based on the Magnetorheological Method
by Mingjie Deng, Ci Song, Feng Shi, Wanli Zhang, Ye Tian and Guipeng Tie
Micromachines 2021, 12(10), 1233; https://doi.org/10.3390/mi12101233 - 10 Oct 2021
Cited by 1 | Viewed by 1335
Abstract
The magnetorheological (MR) repair method can effectively repair the small-scale damage of fused silica optics and further improve the laser-induced damage threshold of fused silica optics. However, at present, the rules of MR repair of small-scale damage of fused silica are not clear [...] Read more.
The magnetorheological (MR) repair method can effectively repair the small-scale damage of fused silica optics and further improve the laser-induced damage threshold of fused silica optics. However, at present, the rules of MR repair of small-scale damage of fused silica are not clear and cannot provide further guidance for the repair process. In this paper, the fused silica damage samples were repaired layer by layer by the MR method. The number and size changes of all the surface damage, the morphology, the fluorescence area distribution, and photothermal-absorption value of a single typical small-scale damage were measured. Through dark field scattering imaging, it is found that when the repair depth is 5 μm, the repair completion rate of damage with a transverse size less than 50 μm can reach 44%, and the repair efficiency decreases gradually with the repair process. Focusing on the whole repair process of a single typical, small-scale damage—due to the flexible shear removal mechanism of the MR method—the repair process of damage can be divided into three stages, which as a whole is a top-down, from outside to inside process. The first stage is the process of removing the surface of the damage layer by layer. In this process, MR fluid will introduce pollution to the inside of the damage. In the second stage, MR fluid begins to repair the inside of the damage. In the third stage, the MR ribbon completely covers the inside of the damage, and the repair effect is the most obvious. The measurement results of photothermal absorption and fluorescence area distribution of damage confirm this process. The photothermal absorption value and fluorescence area distribution of damage do not simply decrease with the repair process. On the contrary, they gradually increase first, and then decrease significantly when the damage depth reaches less than 1 μm. As the thickness of the MR ribbon is 1 μm, the reduction in the photothermal absorption value and fluorescence area of the damage is due to the process of repairing the inside of the damage. The results show that the absorbent impurities inside the small-scale damage of fused silica are the main factor affecting the performance. The key to repairing the small-scale damage of fused silica by the MR method is that the damaged interior must be repaired effectively. This paper outlines the MR repair method of small-scale damage of fused silica, which is of great significance to optimize the MR repair process. Full article
(This article belongs to the Special Issue Micromachining Method for Surface Morphology)
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21 pages, 12361 KiB  
Article
A Comprehensive Investigation on Development of Lightweight Aluminium Miniature Gears by Thermoelectric Erosion Machining Process
by Sujeet Kumar Chaubey, Neelesh Kumar Jain and Kapil Gupta
Micromachines 2021, 12(10), 1230; https://doi.org/10.3390/mi12101230 - 9 Oct 2021
Cited by 5 | Viewed by 1873
Abstract
Nowadays, size, weight, and durability are crucial factors in product development that draw the attention of many researchers and engineers towards research and innovation in the micromanufacturing area. This paper reports on the development of a lightweight aluminium gear of miniature size with [...] Read more.
Nowadays, size, weight, and durability are crucial factors in product development that draw the attention of many researchers and engineers towards research and innovation in the micromanufacturing area. This paper reports on the development of a lightweight aluminium gear of miniature size with a bore and hub using wire-assisted thermoelectric erosion machining (WTEM). The external spur gear was cut from 7075 aluminium alloy round stepped gear blank by WTEM using 0.25 mm brass wire. Further, the miniature gear was tested for various manufacturing quality parameters such as microgeometry, surface roughness, and microstructure, along with evaluating process productivity in terms of volumetric gear cutting speed To understand the mechanism of development of aluminium miniature gear, an investigation on the influence of WTEM parameters namely servo-voltage, pulse-on time, pulse-off time, and wire speed on surface roughness was conducted. A total of 18 gears were fabricated following Taguchi L9 (34) orthogonal array approach of design of experiments considering the randomization and replication. A typical average surface roughness value of 1.58 μm and manufacturing quality of DIN standard number 7 based on gear microgeometry were successfully achieved. Microscopic investigation revealed uniform and accurate tooth profiles, flank surfaces free from burrs and contaminants, and uniform microstructure that confirm the good performance characteristics of the developed lightweight miniature gear of aluminium. This investigation will add new results in the field as regards the development of lightweight microparts. Full article
(This article belongs to the Special Issue Micromachining Method for Surface Morphology)
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Review

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28 pages, 12057 KiB  
Review
Progress in Non-Traditional Processing for Fabricating Superhydrophobic Surfaces
by Dili Shen, Wuyi Ming, Xinggui Ren, Zhuobin Xie and Xuewen Liu
Micromachines 2021, 12(9), 1003; https://doi.org/10.3390/mi12091003 - 24 Aug 2021
Cited by 12 | Viewed by 3348
Abstract
When the water droplets are on some superhydrophobic surfaces, the surface only needs to be inclined at a very small angle to make the water droplets roll off. Hence, building a superhydrophobic surface on the material substrate, especially the metal substrate, can effectively [...] Read more.
When the water droplets are on some superhydrophobic surfaces, the surface only needs to be inclined at a very small angle to make the water droplets roll off. Hence, building a superhydrophobic surface on the material substrate, especially the metal substrate, can effectively alleviate the problems of its inability to resist corrosion and easy icing during use, and it can also give it special functions such as self-cleaning, lubrication, and drag reduction. Therefore, this study reviews and summarizes the development trends in the fabrication of superhydrophobic surface materials by non-traditional processing techniques. First, the principle of the superhydrophobic surfaces fabricated by laser beam machining (LBM) is introduced, and the machining performances of the LBM process, such as femtosecond laser, picosecond laser, and nanosecond laser, for fabricating the surfaces are compared and summarized. Second, the principle and the machining performances of the electrical discharge machining (EDM), for fabricating the superhydrophobic surfaces, are reviewed and compared, respectively. Third, the machining performances to fabricate the superhydrophobic surfaces by the electrochemical machining (ECM), including electrochemical oxidation process and electrochemical reduction process, are reviewed and grouped by materials fabricated. Lastly, other non-traditional machining processes for fabricating superhydrophobic surfaces, such as ultrasonic machining (USM), water jet machining (WJM), and plasma spraying machining (PSM), are compared and summarized. Moreover, the advantage and disadvantage of the above mentioned non-traditional machining processes are discussed. Thereafter, the prospect of non-traditional machining for fabricating the desired superhydrophobic surfaces is proposed. Full article
(This article belongs to the Special Issue Micromachining Method for Surface Morphology)
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