Manufacturing Technology Journal - Latest articles
Results 91 to 120 of 264:
Variable Excitation Piezoelectric Energy Capture Device for Powering Scraper Conveyor Tension Detection Systems
Zhang Hezhe, Wang Cong
Manufacturing Technology 2024, 24(4):578-587 | DOI: 10.21062/mft.2024.059 
Past efforts which focused on the essential monitoring of the chain tension of scraper conveyers employed in fully mechanized coal mining operations have developed innovative power solutions based on the incorporation of piezoelectric devices that generate the electrical power required for the wireless transmission of chain tension data based solely on the vibrations of the scraper conveyor itself. However, these past studies have failed to evaluate the effects of different environmental factors on the electricity generating capacity of the piezoelectric devices. The present work addresses this issue by evaluating the maximum peak-to-peak voltage generated...
Effect of Filler Content and Treatment on Mechanical Properties of Polyamide Composites Reinforced with Short Carbon Fibres Grafted with Nano-SiO₂
Dana Bakošová, Alžbeta Bakošová, Petra Dubcová, Daniela Koštialiková, Andrej Dubec, Mariana Janeková
Manufacturing Technology 2024, 24(4):521-531 | DOI: 10.21062/mft.2024.058
The polyamide PA6 composites reinforced with carbon fibres (CF) are widely studied due to their properties and their high strength to weight ratio. Good adhesion between a filler and a matrix is es-sential for enhancing properties of a resulting composite. This study investigates the effect of the short CF content and the used CF treatment on mechanical properties of the PA6-CF composites. The composites were subjected to tensile, flexural, compression, hardness and Charpy tests as well as dynamical mechanical analysis. An atomic force microscopy was employed to investigate topography of the CF and the composites. Initially, the properties of the composites...
The Impact of Cryogenic Temperatures on the Hardness and Tribological Properties of Cobalt Alloys
Jakub Mráz, Totka Bakalova
Manufacturing Technology 2024, 24(4):626-635 | DOI: 10.21062/mft.2024.057
This article explores the effect of cryogenic temperatures on the properties of cobalt alloys, specifically Stellite 6 and Stellite 12. These alloys are commonly used in applications that require resistance to me-chanical, thermal, and chemical wear. In this study, the focus is on the valve seats for internal combus-tion engines, which are made from cobalt alloys and undergo a freezing process before assembly into the cylinder head. The purpose of freezing is to reduce the diameter of valve seats, making them easier to fit into the cylinder head. However, the length of time spent in freezing can significantly affect the hardness and tribological characteristics...
The Effect of Additive Manufacturing on the Utility Properties of the Reducing Valve Rezistor
Jan Řiháček, Michaela Císařová, Eva Peterková
Manufacturing Technology 2024, 24(3):429-439 | DOI: 10.21062/mft.2024.043
The article is focused on the analysis of the additive technology (3D printing) applicability by using DMLS in the production of the reducing valve part, i.e. atmospheric resistor. Currently, the men-tioned part is produced by EDM in combination with soldering from the Inconel 718 steel. The use of additive technologies brings the assumption of greater flexibility and economy of production, which is verified by a set of analyzes focused on the accuracy of production and the utility properties of the mentioned part. In addition to technological aspects, such as individual production processes, economic aspects are also compared. Individual comparisons...
Experimental Study of Tool Life Depending on Cutting Speed for 100CrMn6 Materials & Statistical Processing Using Linear Regression Analysis
Ľudmila Timárová, Michal Krbaťa, Marcel Kohutiar, Jana Escherová, Milan Jus
Manufacturing Technology 2024, 24(3):448-457 | DOI: 10.21062/mft.2024.044
To increase the service life of the cutting tool, various types of coatings are used in modern times, which have a beneficial effect on extending the service life of the tools. Which contributes to reducing the eco-nomic costs of production. The present article examines the effect of cutting speed on the durability of a cutting tool. In the experimental measurements, three types of replaceable cutting inserts were used, without coating, with TiC and TiN coating. The measurements were carried out during technological operations of longitudinal turning on bearing steel 100CrMn6 without the use of coolant. The durability of the cutting discs was evaluated...
Effects of Filler Modification on the Properties of Elastomeric Composites
Róbert Janík, Ivan Labaj, Petra Skalková, Silvia Ďurišová, Katarína Moricová
Manufacturing Technology 2024, 24(3):365-377 | DOI: 10.21062/mft.2024.056
The application of cellulose (CEL) as a filler in elastomeric composites (ECs) was studied, with cellulose examined in its untreated form (RAW), after DCSBD plasma modification, and ozone pre-treatment. Changes in surface fluorescence demonstrated that DCSBD plasma-modified cellulose achieved better dispersion in the elastomeric composite mixture, which also showed improved strength and elongation in static tensile tests. DMA analysis confirmed changes in visco-elastic properties, with DCSBD plasma-modified cellulose altering the glass transition temperatures of the Elastic and Loss modulus, as well as Tan Delta. SEM microscopy did not conclusively...
Identification of Machine Tool Defects Using Laser Interferometer
Miroslav Matuš, Vladimír Bechný, Richard Joch, Mário Drbúl, Andrej Czán, Michal Šajgalík
Manufacturing Technology 2024, 24(3):420-428 | DOI: 10.21062/mft.2024.052
The geometric accuracy of a machine is primarily determined by the accuracy of assembly, manufactur-ing, and overall setup. Standardized procedures for assessing geometric accuracy are established and detailed in delivery protocols for various types of machining machines. To effectively monitor and ana-lyze machining machine errors, the most suitable approach is to construct a comprehensive error balance that accounts for the overall performance of the machine. This error balance methodology, a tool within the realm of system analysis, is utilized for predicting and managing systemic errors. The errors ob-served in machined components are intimately...
Analysis and Experimental Verification of Human-Robot Coupling Collaboration Characteristics for Lower Extremity Exoskeleton Rehabilitation Robot Based on ADAMS
Peiqin Wang, Hui Song, Runqiang Liu, Yun-chun Jiang, Yi Zheng
Manufacturing Technology 2024, 24(3):467-477 | DOI: 10.21062/mft.2024.055
Motor rehabilitation contributes to neural remodeling in individuals with motor disabilities, which is crucial for their recovery of motor ability. In addressing the No. of human-machine coupling and synergistic motion characteristics in motor rehabilitation, this study analyzes the collaborative motion characteristics of each joint in the lower limbs. A virtual human-machine coupling system is proposed, and the driving functions of the human-machine coupling system are designed. By utilizing ADAMS motion simulation software, the motion characteristics of the human-machine system are analyzed, and the variation patterns of motion parameters at key...
Mechanical Properties and Compression Performance of 3D Printed HIPS Polymer Lattice Structure
Feng Jin, Wanqing Lu, Xu An, Haifeng Zhu, Jun Wang
Manufacturing Technology 2024, 24(3):378-392 | DOI: 10.21062/mft.2024.054
With the development of 3D technology, more and more materials are being used for manufacturing and used in many fields, such as factory manufacturing, workshop manufacturing, food packaging, and even architectural design and civil engineering design. In particular, the mechanical properties of the 3D printed HIPS polymer unit cell structure are worthy of research and analysis, providing more valuable references for future material development. This study focused on the properties of HIPS polymer materials and the performance of HIPS polymer 3D printed lattice structures after Instron instrument compression testing. The experimental samples were divided...
Analysis of Static and Dynamic Characteristics and Lightweight Design of Titanium Alloy Frame
Bin Zheng
Manufacturing Technology 2024, 24(3):507-519 | DOI: 10.21062/mft.2024.053
In response to the problems of insufficient strength and stiffness, as well as large weight in traditional car frames, this article takes titanium alloy frames as the research object. Based on the analysis of static and dynamic characteristics, a lightweight design is carried out to meet the design requirements. Firstly, static analysis was conducted on the frame structure under four different working conditions using the finite element analysis method to study its stress distribution and deformation under different loads and road conditions. Study the natural frequency and vibration mode of the frame through modal analysis, providing a basis for subsequent...
Influence of Thermal-mechanical Coupling of Single Particle on Grinding Surface Roughness
Lai Hu, Zixi Wang, Yuming Wang
Manufacturing Technology 2024, 24(3):344-354 | DOI: 10.21062/mft.2024.051
Grinding is one of the most important processes in machining precision rotating parts. GF & GT (grinding force and grinding temperature) of single particle in grinding wheel have great influence on surface roughness. This study established the GF & GT models of single particles. Abaqus was used to analyze the coupling between GF & GT of single particle. Combined with grinding parameters (grinding depth and grinding speed), the influence of GF & GT on the range of surface roughness of single particle abrasive was comprehensively studied. The machining and experimental analysis of precision aerospace bearings were carried out through...
Proposal for Evaluating the Efficiency of Production Processes Using External and Internal Key Performance Indicators
Erika Sujová, Daniela Vysloužilová, Ivan Babic
Manufacturing Technology 2024, 24(3):440-447 | DOI: 10.21062/mft.2024.050
The paper focuses on proposing a method for implementing key performance indicators (KPIs) to assess the effectiveness of manufacturing processes. For the evaluated processes of precision parts machining, the share of non-conforming products was proposed as a KPI, evaluated as both an exter-nal and an internal indicator. The external indicator EXTppm expressed the quantity of faulty prod-ucts to the volume of production. Its monthly development during 2022 was evaluated. The internal KPI represented the internal share of non-conforming products INTppm during 2022 which was re-lated to the order of part A. Towards the conclusion causes for not attaining...
Study on the Mechanism of Improving Surface Roughness of Gray Cast Iron Machining by Wiper Inserts
Liang Wang, Lei Han, Long He, Kan Wang, Xiaoxin Zhu
Manufacturing Technology 2024, 24(3):478-482 | DOI: 10.21062/mft.2024.049
Based on the high hardness, poor thermal conductivity, and easy detachment of graphite in cast iron materials. Traditional rough machining inserts cannot achieve good machining surface quality, while the use of precision machining inserts results in rapid tool wear due to excessively sharp rake angles, limiting feed rates and reducing machining efficiency. In order to solve these problems, this paper proposes a method of cutting cast iron with coarse and wiper insert mixed cutting tools, aiming to improve the surface quality of machining and enhance machining efficiency. By studying the mecha-nism and cutting experiments of the wiper inserts, it was...
Accuracy of Photogrammetric Models for 3D printed Wrist-hand Orthoses
Tuong Nguyen Van, Natasa Naprstkova
Manufacturing Technology 2024, 24(3):458-464 | DOI: 10.21062/mft.2024.048
Today, 3D printed wrist-hand orthoses can be used to immobilize the arms instead of plaster or fi-berglass casts. Typically, 3D arm models for modelling wrist-hand orthoses can be created using a 3D scanning system. Our previous study shows that smartphone cameras and photogrammetry tech-niques can be used instead of professional 3D scanning systems, but the accuracy of the photogram-metric models has not yet been fully investigated. This paper presents the results of accuracy verifica-tion of arm models reconstructed from 2D images captured with a smartphone camera. The forearm and wrist-hand parts of a photogrammetric model were subjected to a virtual...
Dynamic Analysis of the Propulsion Process of Tunnel Boring Machines
Xiangping Liao, Ying Zhao, Shaopeng Kang, Kailei Liu, Xinyang Zhu, Langxin Sun
Manufacturing Technology 2024, 24(3):410-419 | DOI: 10.21062/mft.2024.047
In response to the need for trajectory correction during the excavation of curved tunnels by tunnel boring machines(TBM), as well as the impact of interference forces generated by the propulsion sys-tem on the design and service life of key components, as well as the low propulsion efficiency of TBM, a dynamic model of the propulsion mechanism during the excavation process is established, and the variation law of the angle between the key components of the thrust hydraulic cylinder and the gripper shoe hydraulic cylinder under the propulsion force of the hydraulic cylinder (1500KN) and three steer-ing angles of 0.5 °, 1 °, and 2 °, as well as the relationship...
Static and Modal Analysis of the Wheel-side Reducer Cover Plate Based on ANSYS
Zhang Yan
Manufacturing Technology 2024, 24(3):483-491 | DOI: 10.21062/mft.2024.046
The three-point front-mounted electric forklift is an important logistics tool nowadays. The wheel-side reducer is a vital power unit of the electric forklift. The cover plate of the reducer casing, as a key component, bears significant external loads. The cover plate of the casing is prone to deformation under the action of loads, leading to part scrapping and reducing the service life of the entire machine. Additionally, as the cover plate directly connects with the vehicle body, vibrations produced by the electric forklift during operation can affect the working stability of the reducer through the cover plate, reducing its lifespan. When designers...
Development and Simulation of a Hybrid Extrusion Mechanism for Enhanced Surface Quality and Precision in FDM 3D Printing
Qing Ge, Yin Wang
Manufacturing Technology 2024, 24(3):338-343 | DOI: 10.21062/mft.2024.045
FDM forming 3D printers may encounter problems such as rough printing surface and poor accuracy during operation. This study mainly utilizes the complementary advantages of piston extrusion mechanism, sliding vane pump extrusion mechanism, and plunger pump extrusion mechanism to design a parallel combination of three nozzle extrusion mechanism, and conducts simulation experiments to verify its effectiveness based on temperature distribution data comparison. It basically avoids the irregular voids and faults caused by the thermal phase change of materials passing through the nozzle during the printing process.
Investigation of Printing Speed Impact on the Printing Accuracy of Fused Filament Fabrication (FFF) ABS Artefacts
Vasiliki E. Alexopoulou, Ioannis T. Christodoulou, Angelos P. Markopoulos
Manufacturing Technology 2024, 24(3):333-337 | DOI: 10.21062/mft.2024.042
This paper introduces a customized Fused Filament Fabrication (FFF) printer, featuring an advanced electromechanical system that achieves a substantial 500% increase in printing speed compared to con-ventional FFF printers. This research scrutinizes the printer's capabilities, emphasizing the dimension-al accuracy. Specifically, this study focuses on the investigation of the effect of high printing speeds on the dimensional accuracy of linear artifacts. The material selected is Acrylonitrile Butadiene Styrene (ABS) and the FFF-fabricated parts are designed and measured based on the ISO ASTM 52902-2021 standard. Last but not least, statistical analysis...
Rolling Bearing Fault Diagnosis Based on Multi-scale Entropy Feature and Ensemble Learning
Mei Zhang, Zhihui Wang, Jie Zhang
Manufacturing Technology 2024, 24(3):492-506 | DOI: 10.21062/mft.2024.041
Aiming at the problem of feature extraction and fault recognition for rolling bearings, a fault diagnosis mthod based on multi-scale entropy and ensemble learning is proposed in this paper. Firstly, the variable mode decomposition algorithm is used to decompose the vibration signal, and then the cross-correlation number method is used to reconstruct the signal to realize the signal denoising. Subsequently, in order to improve the effectiveness of feature extraction for rolling bearings, a feature extraction method based on Refined Composite Multiscale Reverse Permutation Entropy (RCMRPE) is proposed. Then, in order to improve the accuracy of rolling...
Deformation and Velocity Wave Propagation in a Thin Isotropic Plate
Frantisek Klimenda, Blanka Skocilasova, Jan Skocilas, Josef Soukup
Manufacturing Technology 2024, 24(3):393-409 | DOI: 10.21062/mft.2024.040
The propagation and velocity of the deformation wave in the thin isotropic plate is investigated. The deformation is induced by the stroke of impact body onto the facial surface of the plate. The plate is supported perpendicularly. The excitation of the plate oscillation is initialized by a unit force (Heavi-side’s jump). The impact body has a rounded facet by radius c = 2.5 mm. Hook's material model and Kirchhoff’s and Flüegge’s geometric model have been investigated. The analytical solutions for both models are presented. The MATLAB script has been assembled to solve material and geometrical mod-els. The results were compared for...
Application of 35NCD 16 Steel Under Cyclic Loading by an Elastoplastic Model
Brahim Chebbab, Mourad Djeziri
Manufacturing Technology 2024, 24(3):355-364 | DOI: 10.21062/mft.2024.002
The purpose of this paper is to study an application of the 35NCD 16 steel by a model generalizing the isotropic and kinematic strain hardening laws. The model in question is represented by a field of strain hardening moduli corresponding to the introduction of the configuration of the flow surfaces. Each flow surface is characterized by its constant elastoplastic modulus, its normal unit vector, its radius and its center coordinates. For cases of uniaxial or multiaxial (complex) loading, in particular for cases of cyclic loading or unloading, the instantaneous configuration can be determined by the position and dimensions of the flow surfaces, determining...
Carbide Twist Drill Spiral Groove Abrasive Flow Polishing and Abrasive Flow Analysis
Tian Ji, Lintao Lu, Boming Ren, Guihong Bian, Shengli Huang
Manufacturing Technology 2024, 24(2):197-206
This paper carries out the simulation of abrasive flow for twist drill spiral grooves and the experimental study of abrasive flow polishing. The flow of abrasive in spiral groove in abrasive flow polishing twist drill was analyzed by CFD using FLUENT software. Different inlet speeds and abrasive concentrations were used as parameters for simulation calculations to obtain the state parameters of dynamic pressure and abrasive velocity in the flow channel, and to analyse their effects on the abrasive flow in the spiral groove. The analysis results show that the dynamic pressure in the twist drill spiral groove increases with the increase of inlet speed,...
Microtexturing for Enhanced Machining: Evaluating Tool Performance in Laser-Processed Cutting Inserts
Ondrej Bilek, Jan Ondrik, Petr Janik, Tomas Kautsky
Manufacturing Technology 2024, 24(2):173-182
This article explores the significance of microtexturing on cutting tools for improved tribological performance and reduced friction in machining operations. Drawing inspiration from biomimetic structures, the study focuses on laser surface microtexturing and evaluates its impact on cutting forces and tool wear. Experiments involve microtextures of dots with a specific emphasis on a fiber laser-processed pattern. While long-term tests reveal the formation of negative protrusions on the textured tools, reduced variability in cutting forces suggests potential benefits for stable machining processes and increased tool longevity. The findings underscore...
Analysis of Extrusion Process Parameters in PLA Filament Production for FFF Technology
Vojtech Senkerik, Martin Bednarik, Vaclav Janostik, Michaela Karhankova, Ales Mizera
Manufacturing Technology 2024, 24(2):265-271
Additive technologies are becoming a common part of not only prototype production, but also piece or small series production. However, the choice of technology and material plays a key role in the applicability of the manufactured parts. The most widespread type of additive technology is FFF technology, which consists of applying a fused plastic string in single layers. The resulting mechanical properties of parts produced using this technology depend not only on the material and structure selected, but also on the process parameters used in the printing process itself. This study deals with the production of filament from PLA, which is the primary...
Analysis of the Impact of Modernization of Machinery on the Quality of Castings Using Quality Management Tools
Krzysztof Knop, Pavol Gejdoš
Manufacturing Technology 2024, 24(2):207-218
Today's manufacturing industry, especially in the context of the metals industry, is constantly evolving towards ever more advanced technologies and efficient production practices. In this context, machinery modernization is becoming a key element in improving manufacturing processes. This article focuses on analysing the impact of machinery modernization on casting quality, using selected quality manage-ment tools. The article presents an analysis of the effects of the implementation of modern technology, automatic casting machines, on the quality of castings production. Using quality tools such as the Ishi-kawa diagram, Pareto-Lorenz and the FMEA...
Research on Piston Avoidance Valve Pit Milling Method
Changlong Zhao, Hongnan Ma, Qinxiang Zhao, Xiaoyu Jia, Haifeng Zhang
Manufacturing Technology 2024, 24(2):324-331
In order to improve the processing efficiency and surface quality of the piston avoidance pit, reduce labor costs, and make the processing of the piston avoidance pit meet the modern production re-quirements, it is realistic and feasible to combine Pro/E and Mastercam software to complete the processing of the piston avoidance pit. Two different kinds of piston pits are selected for machining, and the 3D model of the piston pits is established by Pro/E software, and the process preparation and parameter setting are realized by Mastercam software, and the NC machining simulation is con-verted into NC code to realize the machining of the piston pits;...
The Effect of Employing an Optimal Web Velocity Profile on Transverse Vibrations in Roll-to-Roll Manufacturing
Kadhim A. Jabbar
Manufacturing Technology 2024, 24(2):192-196
The quality of web products is significantly affected by the running velocity of a process line, especially during the stages of start-up and shutting down of a web processing line. At these stages, a remarkable transverse variation (web flutter) are observed due to employing improper input velocity. Web flutter may cause some web defects such as wrinkles, poor printing and even web breakage. Therefore, employing an optimal web velocity profile is crucial to minimize web transverse vibrations during the transport of the web through different processing sections in a web process line. In this paper, an optimal velocity profile along with common velocity...
Research on Linkage Accuracy of "Baby Hanging Basket" Five-axis Precision Machine Tool
Yuanyuan Wu, Huiling An, Bo Li, Hua Zhang, Lai Hu
Manufacturing Technology 2024, 24(2):307-314
The "baby hanging basket" five-axis precision machine tool (BHBFPMT) studied in this study is mainly used to process open impeller and closed impeller in aerospace field. However, the linkage accuracy (LA) measurement of five-axis machine tool is one of the important detection means to ensure the tolerance requirements of precision parts. The mathematical model of linkage accuracy (LA) of "baby hanging basket" five-axis precision machine tool (BHBFPMT) was established. The accuracy of X, Y, Z, B and C axes was measured, respectively. Combined with the measurement results, a pulse compensation method was proposed to compensate the accuracy. The linkage...
Tribological Properties of 3D Printed Materials in Total Knee Endoprosthesis
Matus Varhanik, Josef Sedlak, Zbynek Studeny, Patricia Janigova, Felicita Chromjakova
Manufacturing Technology 2024, 24(2):294-306
The submitted paper deals with biotribological contact in total knee arthroplasty. The goal was to evaluate the influence of the metal component production technology on tribological parameters in defined environments. The reference sample was a standard available test ball made of the subject material, used in testing tribological properties by the "Ball on Pin" method. The preparation of the experiment consisted in the production of test disks from UHMWPE material and the production of a metal test component with a spherical surface. The condition of the experiment and the basis of this contribution is to compare the properties of conventionally...
Microstructure and Mechanical Properties AlSi7Mg Alloy with Sr, Al and AlSi7Mg
Tomasz Lipiński
Manufacturing Technology 2024, 24(2):227-234
Strength and malleability are important reasons for increasing applications of Al-Si alloys. Mechanical properties of Al-Si cast alloys depend not only on chemical composition but, more importantly, on microstructural features such as morphologies of dendritic α-rich in Al, eutectic β-rich in Si particles and other intermetallics that are present in the microstructure. The microstructure of an unmodified hypoeutectic AlSi7Mg alloy is responsible for the alloy's low strength parameters, and it limits the extent of practical applications. The mechanical properties of hypoeutectic silumins can be improved through chemical modification as well...