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Machines
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Precision Manufacturing and Machine Tools
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Precision Manufacturing and Machine Tools

A special issue of Machines (ISSN 2075-1702). This special issue belongs to the section "Advanced Manufacturing".

Deadline for manuscript submissions: 31 August 2024 | Viewed by 3280

Special Issue Editors

Dr. Marcel Kuruc

E-Mail Website
Guest Editor
Faculty of Materials Science and Technology, Slovak University of Technology in Bratislava, Bratislava, Slovakia
Interests: rotary ultrasonic machining; advanced manufacturing technologies; CAD/CAM software; multi-axis machining; programming of CNC machines
Prof. Dr. Jozef Peterka

E-Mail Website
Guest Editor
Faculty of Materials Science and Technology, Slovak University of Technology in Bratislava, Bratislava, Slovakia
Interests: machining and cutting tools materials; roughness modelling; modelling and simulation; CAD/CAM milling; HSC and HSM

Special Issue Information

Dear Colleagues,

Precision manufacturing and machine tools play a crucial role in the production of high-quality, intricate, and accurate components and products across various industries. The primary goal of precision manufacturing is to produce parts or products that meet or exceed specified dimensions, surface finishes, and quality standards. This approach is essential in industries where precision is critical, such as aerospace, automotive, medical devices, electronics, and more. Precision manufacturing relies on the use of advanced machine tools to create products with exceptional accuracy and consistency. Precision machine tools are essential for achieving the tight tolerances and high accuracy demanded by precision manufacturing. Machine tools are typically equipped with various tools and attachments that can be swapped out to perform different operations. They are often used in conjunction with CAD and CAM software to design parts and generate toolpaths for machining.

Dr. Marcel Kuruc
Prof. Dr. Jozef Peterka
Guest Editors

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. Machines 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 2400 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

  • precision manufacturing
  • machine tools
  • advanced production systems
  • dimensional accuracy
  • surface quality
  • parts finishing

Published Papers (4 papers)

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Research

12 pages, 5577 KiB  
Article
The Influence of the Setup on the Result of Measuring the Roundness of an Anuloid Surface
by Augustín Görög and Marcel Kuruc
Machines 2024, 12(4), 258; https://0-doi-org.brum.beds.ac.uk/10.3390/machines12040258 - 12 Apr 2024
Viewed by 423
Abstract
In engineering practice, anuloid surfaces are produced that are subject to strict requirements in terms of accuracy (e.g., in the bearing industry). Roundness is also often measured. The accuracy of the roundness measurement does not only depend on the accuracy of a particular [...] Read more.
In engineering practice, anuloid surfaces are produced that are subject to strict requirements in terms of accuracy (e.g., in the bearing industry). Roundness is also often measured. The accuracy of the roundness measurement does not only depend on the accuracy of a particular metrological system. The setting of the component on the measuring device can also have a significant influence on the accuracy of the measurement. The axis of the measured surface must be perpendicular to the section in which the roundness is measured. Tilting the measured surface causes a systematic measurement error, which depends on the size of the tilt angle and the parameters of the measured surface. This study presents mathematical relations for the calculation of this error when measuring roundness on an anuloid surface. Mathematical relations for the internal and external surfaces formed by the inner and outer parts of the anuloid are derived herein. There is also a theoretical analysis of the influence of inclination and the parameters of the measured surface on the size of this error. Theoretically calculated values were compared with practically measured values of roundness. The error had a negative effect on the accuracy of the roundness measurement. It affected the roundness value, the second harmonic component, and also the roundness profile itself. Full article
(This article belongs to the Special Issue Precision Manufacturing and Machine Tools)
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19 pages, 10347 KiB  
Article
Evaluation of Suitability of High-Speed Drag Finishing Machine Prototype Utilization for Workpiece Modification
by Marek Vozár, Boris Pätoprstý, Tomáš Vopát, Róbert Straka, František Jurina and Michal Šajgalík
Machines 2024, 12(4), 251; https://0-doi-org.brum.beds.ac.uk/10.3390/machines12040251 - 10 Apr 2024
Viewed by 356
Abstract
The purpose of the experimental results evaluated in this paper is to verify the viability of using a prototype drag finishing machine for the modification of machined workpieces. The workpieces used in the experiments had a cylindrical shape and were manufactured by turning. [...] Read more.
The purpose of the experimental results evaluated in this paper is to verify the viability of using a prototype drag finishing machine for the modification of machined workpieces. The workpieces used in the experiments had a cylindrical shape and were manufactured by turning. Three different workpiece materials were tested, and three workpieces for each material were machined with different cutting parameters. Multiple aspects of the drag-finishing process influence were kept track of—surface roughness, dimensional accuracy, and edge burr shape change. The parameters of the drag finishing were kept constant for all workpieces, and the development of each aforementioned observed aspect was recorded. The workpieces were periodically removed from the process and measured using a coordinate measuring machine with a touch probe, a surface roughness measuring machine, and an optical microscope. Based on the gathered data, it can be concluded that the usage of a prototype drag finishing machine designed primarily for cemented carbide tool microgeometry modification is viable for workpiece finishing as well. The parameters of the drag-finishing process need to be adjusted depending on the workpiece material and initial surface roughness. Additionally, the medium used for the drag finishing should be considered with respect to the desired output quality of the workpiece. Experimental work shows that having one multi-purpose machine for precise modification of wide range of materials and shapes can be an effective approach from the standpoint of economy and productivity when it comes to small numbers of workpieces requiring surface finishing. Full article
(This article belongs to the Special Issue Precision Manufacturing and Machine Tools)
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25 pages, 13022 KiB  
Article
Design and Optimization of Production Line Layout Using Material Flows
by Michal Bučko, Lucie Krejčí, Ivo Hlavatý and Jiří Lorenčík
Machines 2024, 12(3), 189; https://0-doi-org.brum.beds.ac.uk/10.3390/machines12030189 - 14 Mar 2024
Viewed by 865
Abstract
Businesses are constantly trying to improve their production by looking for bottlenecks to improve their market position. The introduction and innovation of automated production lines is necessary for both labor shortages and productivity and quality reasons. A combination of precision, fluidity, and speed, [...] Read more.
Businesses are constantly trying to improve their production by looking for bottlenecks to improve their market position. The introduction and innovation of automated production lines is necessary for both labor shortages and productivity and quality reasons. A combination of precision, fluidity, and speed, that is the basic definition of a production line. With the advent of new technologies, production lines have also begun to continuously speed up and innovate. Innovation is the subject of this paper, where the problem of designing a completely new layout for a new production line in the food industry has been addressed. The aim of this paper was to create a design for the optimal layout of the production line in preselected production areas. Optimal use of the space allocated for production is very important for every company today. Full article
(This article belongs to the Special Issue Precision Manufacturing and Machine Tools)
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14 pages, 7366 KiB  
Article
The Selection of Cutting Speed to Prevent Deterioration of the Surface in Internal Turning of C45 Steel by Small-Diameter Boring Bars
by Tomáš Vopát, Marcel Kuruc, Boris Pätoprstý, Marek Vozár, František Jurina, Barbora Bočáková, Jozef Peterka, Augustín Görög and Róbert Straka
Machines 2024, 12(1), 68; https://0-doi-org.brum.beds.ac.uk/10.3390/machines12010068 - 17 Jan 2024
Viewed by 895
Abstract
The turning of small-diameter deep holes is usually critical when the process of machining is unstable and the use of a special boring bar is often necessary. This paper is focused on the influence of cutting speed with a combination of cutting conditions [...] Read more.
The turning of small-diameter deep holes is usually critical when the process of machining is unstable and the use of a special boring bar is often necessary. This paper is focused on the influence of cutting speed with a combination of cutting conditions such as feed and tool overhang on chatter marks, surface roughness and roundness of machined holes. In the experiment, two types of tool material for indexable boring bars were used, namely cemented carbide and steel. These are a group of boring bars used for the internal turning of holes of small diameters with indexable cutting inserts. Monolithic carbide boring bars are already used for internal turning of holes of even smaller diameters. Uncoated turning inserts made of cermet were used. The cutting tests were performed on the DMG CTX alpha 500 turning center. In the case of the steel boring bar, decreasing the cutting speed really led to an increase in the quality of the surface roughness and reduced the formation of chatter marks and large chatter marks. The cemented carbide boring bar also followed a similar trend, but it should be noted that the overall effect was not so great. This means that increasing the cutting speed makes the cutting process less stable and, vice versa, lower values of cutting speed reduce the formation of chatter marks and the related deterioration of the surface quality. The occurrence of chatter is directly related to the increase in the surface roughness parameters Ra and Rz of the machined surface. It can be stated that the dependence of roundness deviations on cutting speed values has a similar character to the results of the measured surface roughness values. Therefore, if the cutting speed is increased, it will make the cutting process less stable; this is also indirectly reflected in larger roundness deviations. However, it is necessary to state that this phenomenon can be observed in turning holes with small diameters using the steel boring bar, where the unstable cutting conditions materialized in the form of chatter marks. Full article
(This article belongs to the Special Issue Precision Manufacturing and Machine Tools)
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