Manufacturing Technology Journal, 2025 (vol. 25), issue 5
In Situ TEM and Molecular Dynamics Investigation of Grain Growth in Nanocrystalline Cu Nanoparticles
Lucia Bajtošová, Mia Myšičková, Nikoleta Štaffenová, Elena Chochoľaková, Jan Hanuš, Jan Fikar, Miroslav Cieslar
Manufacturing Technology 2025, 25(5):576-581 | DOI: 10.21062/mft.2025.072 
The thermal stability of nanocrystalline Cu nanoparticles was investigated using a combination of in situ TEM annealing experiments and molecular dynamics (MD) simulations. Nanoparticles prepared by a gas aggregation source exhibit an average size of ~100 nm and are predominantly polycrystalline, with grains of ~25 nm. Upon annealing up to 600 °C, the particles preserve their external morphology without signs of sintering, while their internal structure evolves through progressive grain growth. Orientation mapping revealed an increase in Σ3 and other special boundaries, consistent with the tendency of grain boundary networks to evolve toward low-energy...
Effect of Laser Shock Peening and Hot Isostatic Pressing on the Microstructure of MoNiCr Nickel Based Alloy
David Bricín, Zbyněk Špirit, Josef Strejciu, Antonín Kříž
Manufacturing Technology 2025, 25(5):582-588 | DOI: 10.21062/mft.2025.074
This study aimed to evaluate the change in the microstructure of MoNiCr nickel-based alloy because of specimen surface modification by laser shock peening (LSP) followed by heat treatment using the hot isostatic pressing technology (HIP). Specimens which were cut from casted ingot had 7 mm in thickness and 117 mm in diameter. LSP surface modification was performed in a 60x60 mm square grid on the central part of each of them. Different values of laser power density in combination with or without tape or underwater condition were used for that operation. Specimens were then cut in half. One part each of them was left in LSP surface treatment conditions,...
Strategy for Fabricating Tree-Like Branched Al-Al₂Cu Heterogeneous Nanostructures for Future Application in Battery Anodes
Elena Chochoľaková, Lucia Bajtošová, Nikoleta Štaffenová, Jan Hanuš, Peter Minárik, Miroslav Cieslar
Manufacturing Technology 2025, 25(5):589-596 | DOI: 10.21062/mft.2025.067
Tree-like branched Al-Al₂Cu heterogeneous nanostructures with a high surface area ratio were successfully fabricated using magnetron sputtering of Al matrix and Cu nanoparticles, followed by in situ annealing. The method enables precise control over the composition and morphology of the nanosized columnar Al₂Cu phase grown on the substrate and embedded in the Al matrix. The formation of Al₂Cu begins at the initial locations of sputtered Cu nanoparticles. Further annealing promotes their coalescence and coarsening. Orientation relationships examined in several Al₂Cu particles revealed a semi-coherency with the Al matrix. The...
Elevator Vibrations and Ways to Reduce Them
Tereza Jarosova, Lenka Rychlikova, Blanka Skocilasova, Frantisek Klimenda
Manufacturing Technology 2025, 25(5):597-606 | DOI: 10.21062/mft.2025.069
The article deals with the measurement of the vibrations in passenger elevators. The introduction of an article briefly discusses machine vibrations and their impact on machine design and the surrounding environment. The basic equations from which the equations of motion are derived are listed here. The importance of analyzing machine vibrations in their design, or rather proposing solutions to reduce vi-brations during machine reconstruction, is emphasized. Specifically, attention is paid to vibrations gen-erated during an elevator operation in the elevator shaft. This is an elevator for transporting people in a newly constructed 5-story building....
Evaluation of Dimensional Accuracy and Surface Topography of Plastic Parts
Eva Jurickova, Stepan Kolomy, Josef Sedlak, Denisa Hrusecka, Petra Sliwkova, Jiri Vitek
Manufacturing Technology 2025, 25(5):607-617 | DOI: 10.21062/mft.2025.073
The objective of this paper is the evaluation of dimensional and geometric accuracy and surface to-pography of milled parts from plastic. This evaluation was done on 10 samples from various thermo-plastics made by extrusion and FDM 3D printing. The samples were then milled. One side was milled dry while the other was milled with cutting fluid, which has improved the texture of the result-ing machined surfaces in most cases, for example with printed PLA, where Ra was reduced by 1.8 µm. For determining the dimensional and geometric accuracy, two parameters were chosen, those being distance and parallelism. For evaluating the surface topography,...
Hydrogen Embrittlement of Ferritic-Perlitic and Martenzitic Pipe Steels
Anna Knaislová, Jan Zmeko, Matěj Reiser, Nikola Macháčková, Dalibor Vojtěch
Manufacturing Technology 2025, 25(5):618-625 | DOI: 10.21062/mft.2025.064
This study investigates the susceptibility of two pipeline steels, ferritic–pearlitic CSN 12022 and martensitic L80, to hydrogen embrittlement. Electrolytic hydrogen charging increased the absorbed hydrogen content approximately fivefold in both steels, with the martensitic grade showing higher uptake due to its dense dislocation network and carbide distribution. Tensile tests demonstrated that hydrogen had little influence on yield or ultimate tensile strength but caused a severe reduction in ductility. Elongation dropped from 39 % to 13 % in CSN 12022 and from 25 % to 11 % in L80. Fractographic analysis confirmed a transition from ductile dimple...
The Influence of Solidification Route on As-cast Microstructures of Al-Cu-Li-Mg-Zr-Sc Alloy
Rostislav Králík, Lucia Bajtošová, Barbora Kihoulou, Tomáš Krajňák, Miroslav Cieslar
Manufacturing Technology 2025, 25(5):626-644 | DOI: 10.21062/mft.2025.065
The influence of the casting method on the microstructures of Al-Cu-Li-Mg-Zr-Sc was examined. The techniques include mold casting, twin-roll casting, and melt spinning. Estimated solidification rates up to 107 K·s−1 produce dendritic solidification with eutectic cells ranging from 500 nm to 50 μm, decorated by primary phase particles with thicknesses from 200 nm to 3 μm. Exceeding this solidification rate results in near-diffusionless solidification, which traps more solutes in the matrix. This type of solidification yields a more supersaturated material with nearly 90% of the total Cu content in the matrix and a fine dispersion...
Push-Type Rotary Steering Mandrel Mechanical Analysis and Life Prediction
Wenzhe Li, Ye Chen, Jichuan Zhang, Xudong Wang, Pengcheng Wu, Chengyu Ma, Xiumei Wan, Xing Chen
Manufacturing Technology 2025, 25(5):645-654 | DOI: 10.21062/mft.2025.061
The push-type rotary steerable core bearing has high load capacity and high precision, and has been widely used in oil and gas drilling field. Its service life is difficult to predict due to various complex working conditions. Based on the finite element method, this paper establishes a three-dimensional rotating guide mandrel model to calculate and analyze the mechanical simulation of the guide mandrel under different working conditions, and establishes the corresponding life prediction model to predict its life. The results show that reducing the torque and speed in the range of drilling requirements is conducive to improving the overall life of...
Experimental Investigation of the Effect of Fuel on Engine Oil Life
Pavol Mikuš, Alena Breznická, Marcel Kohutiar, Michal Krbaťa, Milan Jus, Lucia Kakošová, Jozef Fekiač
Manufacturing Technology 2025, 25(5):655-661 | DOI: 10.21062/mft.2025.068
The fuel content of engine oil is a significant factor affecting its degradation processes, lubricating properties and overall service life, especially in the case of modern internal combustion engines equipped with turbocharging, direct injection and exhaust gas recuperation systems. This study analyzes the dilution of engine oil with fuel in diesel and gasoline engines of vehicles with different degrees of wear, represented by the number of kilometers driven. The main objective of the research is to identify the relationship between the fuel concentration in the oil and changes in its physicochemical properties, as well as the potential impact of...
Mechanical Alloying, an Innovative Way of Zinc Preparation for Biomaterial Preparation
David Nečas, Jan Blažek, Jan Pokorný, Anna Boukalová, Jiří Kubásek
Manufacturing Technology 2025, 25(5):662-669 | DOI: 10.21062/mft.2025.070
In this study, binary zinc-based alloys (Zn–1Mg, Zn–1Li, Zn–2Mn, wt.%) were synthesized by performing mechanical alloying (MA) of elemental powders, followed by consolidation using spark plasma sintering (SPS). The processing parameters were optimized to obtain homogeneous powders with controlled particle size. X-ray diffraction and SEM analyses confirmed the presence of secondary intermetallic phases (Mg2Zn11, Zn13Mn, ZnLi2 phases) formed during milling, which were preserved after SPS. Microstructural examination revealed a fine-grained microstructure with residual oxide networks originating from powder surfaces. Mechanical testing...
Fast and Cost-effective Calibration Method of Assembly Errors on Rotary Axes of Five-axis Machine Tools
Yongqiang Pan, Yue Tang
Manufacturing Technology 2025, 25(5):670-677 | DOI: 10.21062/mft.2025.062
Five-axis machine tools are key equipment to process impellers, blades, and other precision mechanical parts. However, the accuracy of the machine tools is significantly influenced by assembly errors, and over time, these errors may change, further impacting the machining accuracy. Traditional laser interferometry technology can identify such assembly errors. The development of on-machine measurement technology has enabled methods that utilize on-machine measurement for assembly error calibration, improving calibration efficiency. The study introduces an efficient method to calibrate the assembly errors of machine tool rotary axes. First, the kinematic...
Airflow Resistivity Measurements of Acoustic Poroelastic Materials and their Influencing Factors
Attila Schweighardt, Balázs Vehovszky, Dániel Feszty
Manufacturing Technology 2025, 25(5):678-688 | DOI: 10.21062/mft.2025.075
In the automotive sector, poroelastic materials (PEMs) are used as trim elements to achieve the desired interior acoustics of a vehicle. This study examines the effect of manufacturing as well as measurement techniques on airflow resistivity. This property plays a key role in the acoustic behavior of PEMs. First, the importance of engineering acoustics and poroelastic materials in vehicle industry is reviewed, followed by the introduction of the most important properties and their measurement techniques. Next, the theory and the measurement techniques used to determine resistivity via direct method are detailed. Then the factors influencing the results...
Temperature Matters: Annealing Effects on Silver Protection and Tungsten Oxidation in W@Ag Core-Shell Powder
Angelina Strakošová, Pavel Lejček, Ilona Voňavková, Vojtěch Dalibor
Manufacturing Technology 2025, 25(5):689-697 | DOI: 10.21062/mft.2025.063
Core-shell powders have been extensively studied due to their complex structure and wide range of applications. W@Ag core-shell powders are particularly interesting due to the synergy between the tungsten and silver, which can be beneficial in the electronics industry. However, knowledge of their thermal stability is limited, particularly concerning the impact of annealing temperatures on structural integrity and oxidation resistance. In this work, W@Ag core-shell powder was heat-treated in the temperature range 100–700 °C for 1 h in air. Investigation of the microstructural changes using scanning electron microscopy equipped with energy-dispersive...
Experimental Measurement of Defects Propagation for a Passenger Car Tire Casing under Dynamic Loading
Ján Vavro jr., Ján Vavro, Lukáš Klimek, Miloš Taraba, Tomasz Domański, Zbigniew Saternus, Petra Dubcová
Manufacturing Technology 2025, 25(5):698-710 | DOI: 10.21062/mft.2025.071
The given paper deals with the defects propagation in car tires for passenger vehicles under dynamic loading. The occurrence of defects has the significant influence on the lifetime and quality of the tire, especially during its operation as a part of the vehicle. The given defects are closely connected with a safety in road traffic. The aim of the study was to carry out a non-destructive analysis of the car tire for the purpose to analyze the defects propagation as well as to introduce the defects classification and their location along with the whole course of rupture as a result of increasing speed, loading and the number of hours or kilometers...
Research on Optimization Design and Processing Technology of Engine Intake System Based on NX and Fluent
Jun Zhang, Ruqian Gao, Yangfang Wu
Manufacturing Technology 2025, 25(5):711-719 | DOI: 10.21062/mft.2025.066
To design an engine intake system that complies with FSC racing regulations while achieving enhanced operational stability, this study conducts a comprehensive review of domestic and international research advancements in racing engine intake systems. Through computational fluid dynamics simulations performed in Workbench Fluent, critical structural parameters of the restrictor valve were optimized, resulting in a 12.06% improvement in outlet mass flow rate compared to the baseline design. A three-dimensional parametric model of the racing intake system was developed using Siemens NX platform. Taking the intake plenum chamber as a representative component,...