Manufacturing Technology Journal - Latest articles
Results 181 to 189 of 189:
The Effect of the Solution Annealing Temperature in the Hardening Process on the Properties of Al-Si-Cu Alloys
Tomáš Vlach, Jaromír Cais, Filip Mamoń, Jakub Mareš
Manufacturing Technology 2024, 24(1):141-147 | DOI: 10.21062/mft.2024.011 
This article deals with the influence of the applied solution annealing temperatures in the precipita-tion hardening process on the resulting increase in the mechanical properties of Al-Si-Cu alloy cast-ings with different copper contents in the alloy. AlSi7Cu2 and AlSi7Cu4 alloys were cast by gravity casting in a metal molds. Each of the samples was subjected to the Vickers microhardness measure-ment of a solid solution of α(Al) and Brinnel hardness measurement. Microscopic analysis and evalu-ation of the internal structure of each alloy was carried out in relation to used solution-annealing temperature.
Effect of Change in Current Density on Hydrogen Embrittlement of Advanced High-Strength Steel S960MC during Hydrogenation
Petra Drímalová, František Nový, Milan Uhričík, Petra Váňová, Lukáš Šikyňa, Veronika Chvalníková, Martin Slezák
Manufacturing Technology 2024, 24(1):40-46 | DOI: 10.21062/mft.2024.010
Hydrogen embrittlement involves the interaction between hydrogen and the microstructure of metals, which can lead to an alarming loss of mechanical properties. For advanced high-strength (AHS) steel S960MC grade, which finds application in fields ranging from heavy machinery to construction, understanding this phenomenon is important. The material's complex crystalline lattice, carefully engineered to maximize strength, becomes vulnerable in the presence of hydrogen. The sources of hydrogen that can lead to embrittlement of steel are various. From the exposure of steel to hydrogen during production processes to the absorption of hydrogen from the environment....
Dilatometric Effects Accompanying Phase Transformations during Tempering of Spring Steels
Jakub Kotous, Zbyšek Nový, Petr Motyčka, Pavel Salvetr
Manufacturing Technology 2024, 24(1):62-72 | DOI: 10.21062/mft.2024.009
The tempering procedure of quenched 54SiCr6 spring steel was analyzed using continuous heating dilatometry, isothermal dilatometry, metallography, and hardness measurement. The dilatometry was performed on four different steel modifications with graduated Si content and with two levels of Cu. Metallography and hardness measurement were analyzed only on samples with one Si level. Two types of tempering procedures were compared in this experimental program. The first one was sim-ple one-step tempering, the other was a special procedure of strain assisted tempering (SAT), which includes double tempering and strain applications between tempering. A dilatometry...
The Microscopic Study of the Evolution of the Phase Transformation in the Tin after the Indentation of an Inoculator
Alena Michalcová, Šárka Msallamová, Dominika Fink, Jiří Kubásek, Martin Friák
Manufacturing Technology 2024, 24(1):83-86 | DOI: 10.21062/mft.2024.007
This paper describes β-Sn to α-Sn transformation in its initial phase. This process is also known as a tin pest and currently it causes problems mainly in the field of soldering materials. To avoid misrepresenta-tion of the results of artificial ageing of the samples; we have decided to use historical materials for our study. A sample from historical organ pipes was indented by naturally formed α-Sn polycrystalline parti-cles by the load of 1 kg. The sample in the initial state was observed by SEM and analysed by EBSD mapping. The position of inoculator particles was documented again by SEM observation. Subseqently, the sample was freezed...
Measurement of the Dynamic Load of the Cervical Vertebrae of the Human Spine – Pilot Experiment
Igor Žuravský, Martin Novák, Petr Vachata, Martin Sameš, Milan Chalupa, Adam Švásta, Martin Svoboda, Patrik Balcar
Manufacturing Technology 2024, 24(1):164-171 | DOI: 10.21062/mft.2024.006
The article deals with the experimental measurement of the load on the cervical vertebrae when driving a passenger car over bumps. The measurement was done experimentally. The load on the human spine was measured in the area of the C7 cervical vertebra and also in the area of the top of the head. Vehicle crossings over speed bumps. The measurement was carried out at different crossing speeds and at different heights of speed bumps. Three-axis acceleration sensors were placed on selected parts of the vehicle and on the human body. The proposed measurement methodology was verified by the conducted pilot experiment for the possibility of conducting further...
Motion Planning and Simulation of Multifunctional Over-the-tube Pipe Climbing Robot
Li Dong, Tongchao Xing, Yi Zheng
Manufacturing Technology 2024, 24(1):28-39 | DOI: 10.21062/mft.2024.005
Due to the complexity of the current industrial pipeline layout, in order to improve the efficiency of pipeline inspection and maintenance, a multi-functional obstacle-surmounting pipe-crawling robot was designed to address the issues of varying pipe diameters and positions. The movement pattern of the crawling robot was studied, the variation of the clamping force of the clamping mechanism during the climbing process was analyzed, and the mapping relationship between various parameters was obtained as the basis for later kinematic simulation. The design of inverted V, positive V and other drive combinations and the planning of multi-functional obstacle-surmounting...
Parameter Optimization Study of Ultra-High Speed Cutting by DOE Method
Dongya Li, Yichen Jiang, Shuang Wang, Yifan Wu
Manufacturing Technology 2024, 24(1):73-82 | DOI: 10.21062/mft.2024.004
With the increasing demand for high-quality flange, there is a greater need for high-quality and high-speed machining technology. Aiming at the difficulty of surface roughness in meeting design requirements and poor machining stability of 7075 aluminum alloy, the classical Design of Experiments (DOE) method is employed to optimize the machining parameters and identify eight pertinent factors. By selecting the feed rate and cutting speed as the two significant factors, a mathematical model of roughness is derived, and the theoretically optimal machining parameters are determined. According to corresponding experimental results, the roughness, the parallelism...
Observation of the Amount of Wear and the Microstructure of Hardfacing Layers after the Test of Resistance to Abrasive Wear
Miroslava Ťavodová, Miroslav Džupon, Monika Vargová, Dana Stančeková, Jozef Krilek
Manufacturing Technology 2024, 24(1):131-140 | DOI: 10.21062/mft.2024.003
The article deals with the evaluation of the amount of wear of the base material and selected hardfac-ing materials intended for tools for wood processing in forestry after a test of resistance to abrasive wear in laboratory conditions. The values of average weight loss Wh[g] and relative resistance to abrasive wear Ψh[-] were determined by calculation. The topography of the surface after the track of the rubber disc and the abrasive of the testing device was evaluated with a confocal microscope. The depth of the disc track Pt[μm;mm] was also evaluated with a confocal microscope. The state of the samples surface after the test, as well as...
Influence of Technological Parameters on the Cutting Temperature during Trochoidal Milling
Kamil Piotr Waszczuk
Manufacturing Technology 2024, 24(1):148-153 | DOI: 10.21062/mft.2024.001
The aim of the article was to present the results of cutting temperature measurements during trochoidal milling. The investigated material was 145Cr6 (50 HRC). Three trochoidal paths were used: A– described by movement circle, B– described by arcs and straight lines, C– described by short lines between a lot of points. The main conclusions include: similar values of cutting tem-peratures when using paths A and C (differences between the values of about 5%), the use of a trochoidal path type B enables a significant reduction of the cutting temperature. During tro-choidal milling, the maximum temperature values were about 420ºC.