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Micromachines
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Manufacturing Methods or Processing Methods in Micromachines, 2nd Edition
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Manufacturing Methods or Processing Methods in Micromachines, 2nd Edition

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

Deadline for manuscript submissions: closed (31 January 2025) | Viewed by 1566

Special Issue Editor

Dr. Laurentiu Slatineanu

E-Mail Website
Guest Editor
Department of Machine Manufacturing Technology, "Gheorghe Asachi" Technical University of Iasi, 700050 Iași, Romania
Interests: electrical discharge manufacturing; additive manufacturing; non-traditional processing; cutting processes; machine manufacturing technologies
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Manufacturing technologies have been the subject of much research and concentration in industry over recent years. Traditional or non-traditional technologies, cutting or additive manufacturing technologies are currently the basis for obtaining finished parts, while precision production technologies have been developed to meet the requirements of micro-dimensions and high manufacturing precision. In addition, fundamentally different technologies are now combined to exploit the strengths and advantages of several distinct process categories to obtain and highlight new properties or uses. Micro-scale production processes are key technologies that make it possible to better understand and reduce the gap between the nano- and macro-domains. They allow us to increase the accuracy of micro/nano-precision production technologies and the integration of different micro-processing technologies in large-scale production processes. Consequently, this Special Issue aims to present research papers and communication and review articles focusing on new methodological developments in micro- and nano-scale production, i.e., on new process chains, including process optimization, quality assurance approaches, and metrology for all production categories.

We look forward to receiving your submissions!

Dr. Laurentiu Slatineanu
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

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 2100 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.

Keywords

  • high-accuracy machine manufacturing technologies
  • micro-machining processes
  • additive micromanufacturing
  • non-traditional micromanufacturing processes
  • methods of micromanufacturing

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Related Special Issue

Published Papers (2 papers)

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Research

12 pages, 5314 KiB  
Article
Surface Characteristics and Fatigue Resistance of Ultrasonic Rolling-Treated 20Cr1Mo1V1A Valve Stem
by Shuailing Lan, Fan Chen, Wenbo Bie, Meng Qi and Zhiyuan Zhang
Micromachines 2025, 16(3), 265; https://doi.org/10.3390/mi16030265 - 26 Feb 2025
Viewed by 335
Abstract
The valve stem made of 20CrMo1V1A has low surface resistance and high susceptibility to corrosion, significantly curtailing its service life. To address these issues, a high-quality ultrasonic rolling (USR) technology was applied to the 20CrMo1V1A stainless steel valve stem to enhance its corrosion [...] Read more.
The valve stem made of 20CrMo1V1A has low surface resistance and high susceptibility to corrosion, significantly curtailing its service life. To address these issues, a high-quality ultrasonic rolling (USR) technology was applied to the 20CrMo1V1A stainless steel valve stem to enhance its corrosion resistance and mechanical properties. Subsequently, fatigue and corrosion tests were conducted on the valve stem. The results indicate that USR produces surfaces with a roughness average (Ra) of 0.3 μm and a gradient nanostructure on the valve stem surface. This unique microstructural modification resulted in a 27% improvement in surface hardness and nearly a three-fold grain size reduction. Additionally, the friction coefficient and electrochemical corrosion rate dropped by 47% and 32%, respectively. Therefore, USR was applicable for enhancing multiple properties of valve components as an additional final processing step for achieving high-performance valve stems. Full article
(This article belongs to the Special Issue Manufacturing Methods or Processing Methods in Micromachines, 2nd Edition)
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15 pages, 5710 KiB  
Article
The Stamping Method Utilizing a Double-Trough Die in Microforming to Enhance Formability
by Ming-Hung Hsu, Kuo-Ming Huang, Chuan-Hsaing Chang and Chung-Ping Liu
Micromachines 2024, 15(7), 922; https://doi.org/10.3390/mi15070922 - 18 Jul 2024
Viewed by 888
Abstract
Currently, the field of microgear manufacturing faces various processing challenges, particularly in terms of size reduction; these challenges increase the complexity and costs of manufacturing. In this study, a technique for microgear manufacturing is aimed at reducing subsequent processing steps and enhancing material [...] Read more.
Currently, the field of microgear manufacturing faces various processing challenges, particularly in terms of size reduction; these challenges increase the complexity and costs of manufacturing. In this study, a technique for microgear manufacturing is aimed at reducing subsequent processing steps and enhancing material utilization. This technique involves the use of trough dies with extrusion-cutting processing, which enables workpieces to undergo forming in a negative clearance state, thus reducing subsequent processing time for micro products. We conducted finite element simulations using microgear dies, measuring stress, velocity, and flow during the forming process of four types of dies-flat, internal-trough, external-trough, and double-trough dies. The results indicated that the buffering effect of the troughs reduced the rate of increase in the material’s internal stress. In the cavity, the material experiences a significant increase in hydrostatic pressure, leading to the formation of a “hydrostatic pressure wall”. This pressure barrier imposes substantial constraints on the flow of the material during dynamic processes, making it difficult for the material to move into the remaining areas. This effectively enhances the blockage of material flow, demonstrating the critical role of hydrostatic pressure in controlling material distribution and movement. In addition, combining the characteristics of both into a double-trough die enhances the overall stability of forming velocity, reduces forming load and energy consumption, and maximizes material utilization. Results further revealed that microgears manufactured using double-trough dies exhibited defect-free surfaces, with a dimensional error of less than 5 μm and tolerances ranging from IT5 to IT6. Overall, this study offers new insights into the traditional field of microgear manufacturing, highlighting potential solutions for the challenges encountered in current microstamping processes. Full article
(This article belongs to the Special Issue Manufacturing Methods or Processing Methods in Micromachines, 2nd Edition)
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