Manufacturing Technology Journal - Latest articles
Results 151 to 180 of 201:
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 Vyslouľilová, 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 Gejdoą
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...
Design Method of Cam Five-bar Paper Picking Mechanism of Packaging Machine Based on Position and Orientation Constraints
Ming-rui Xue, Jun Ye, Hong-qian Hu
Manufacturing Technology 2024, 24(2):315-323
The work aims to present a design method of cam five-bar paper taking mechanism of packaging machine based on position and orientation constraints to better meet the position and orientation requirements of the end paper taking actuator in the high-speed paper picking process. At the first stage, according to the given ideal position and orientation requirements of the end paper taking actuator, the mathematical model of the five-bar mechanism satisfying the position and angle constraints is established by using the kinematic mapping theory, and two cams are used to constrain the two freedom of the five-bar mechanism to obtain the cam five-bar paper...
A Unique Numerical Model to Evaluate the Influence of Adherends’ Misalignment on Adhesive Joint Strength
Andrea Corrado, Wilma Polini
Manufacturing Technology 2024, 24(2):183-191
Industry 4.0 needs to have a digital representation of the real manufacturing and assembly processes to foresee the effects of modifications on equipment, tools and processes. Assembly processes often use adhesive to keep together the components because it has many advantages. The simplest example of adhesive assembly is a single lap joint. In the literature, the attention is focused on nominal adhesive assemblies, that do not represent the real products and that are tested to evaluate the product’s strength. Therefore, the obtained mechanical performances are far from those connected with the real products. The present work takes into account...
Optimization of Process Parameters for a Vertical Shaft Impact Crusher through the CFD-DEM Method
Ke Sun, Limei Zhao, Qitao Long
Manufacturing Technology 2024, 24(2):279-288
In this study, the process parameters of a vertical shaft impact (VSI) crusher are optimized. Different feed size distributions, material physical properties, and product size distribution requirements are considered to determine the optimal material particle bond cleavage ratio. First, a numerical model is developed to simulate the crushing effect by adopting a CFD-DEM method. Then, the relationship between the crushing effect and the rotor speed, feed size distribution, and feed rate is revealed by analyzing the bond cleavage ratio of smaller-size distribution feed crushing to the specified particle size. The optimized working parameters of the crusher...
The Effect of Strain Rate on the Friction Coefficient
Petr Svoboda, Miroslav Jopek
Manufacturing Technology 2024, 24(2):289-293
The Male and Cockroft ring compression test is one of the methods used to determine the coefficient of friction in forming. This method can be used to determine the coefficient of friction without the need to measure the force. This paper describes the results of the Male and Cockroft ring compres-sion test for the Hardox 450 material at different strain rates. The experiment was performed on ZD40 hydraulic press and CFA-80 pneumatic die hammer at the Faculty of Mechanical Engineering of Brno University of Technology. The test results were recorded in a calibration diagram. The results show that the strain rate has a significant effect on the coefficient...
The Manufacturing of Environmental Barrier Coatings by HV-APS Plasma Spraying Using Er2O3 and SiO2 Powder Mixture
Paweł Pędrak, Tadeusz Kubaszek, Barbara Ko¶cielniak, Marek Góral, Mateusz Micał
Manufacturing Technology 2024, 24(2):255-264
Over the last decades, nickel-based superalloys with TBC coatings have been used as the main material for hot section turbine parts. The next step in the development of engines and increasing the combustion temperature is the use of Ceramic Matrix Composites (CMC). Nevertheless, in the presence of water vapour or molten salts, accelerated degradation of substrate material. This problems can be pre-vented by additional layers or coatings produced on its surface, or combinations of layers and coatings that form Environmental Barrier Coatings (EBCs). The aim of the research was the preparation of sam-ples of a mixture of erbium oxide powders with silicon...
Microstructure and Properties of Natural Alloy Prepared by Aluminothermic Reduction of Deep-Sea Nodules and Processed by Rapid Solidification
Alena Michalcová, Matouą Orlíček, Pavel Novák
Manufacturing Technology 2024, 24(2):235-240
This paper explores the investigation of a natural alloy processed using the rapid solidification tech-nique. The study involves the reduction of manganese nodules through aluminothermy with a 20 wt. % excess of aluminum, followed by further processing of the resulting alloy using the melt-spinning process. The obtained melt-spun ribbons were subjected to a comprehensive analysis, including X-ray diffraction, scanning electron microscopy for microstructure observation, and EDS analysis for local chemical composition. The research unveiled that the rapidly solidified ribbons consist of several key phases, including β-Mn, the Heusler phase Mn2FeSi,...
Roughness of Face-Milled Surface Topography in Directions Relative to the Feed Movement
Antal Nagy, János Kundrák
Manufacturing Technology 2024, 24(2):241-254
By achieving the accuracy and roughness requirements imposed on the connecting surfaces of machine components –the topography created during machining – it is guaranteed to meet the operational requirements. We cannot ignore the fact that if connected milled plane surfaces move in different directions relative to each other during operation, there may be different contact conditions caused by the unevenness of the topography. The direction-dependent roughness irregularities and functional characteristics of the topography are not sufficiently explored, thus in this work we examine the roughness and its deviations by assuming displacements...
Research and Dynamic Analysis of a Cable Reel Device Based on Constant Tension
Hengcan Li
Manufacturing Technology 2024, 24(2):219-226
A constant tension cable reel based on planetary gear transmission is introduced. The parameters of the mechanism are determined to analyze the speed and torque of the transfer mechanism. The relationship between the thread pitch and cable type show that different cable models require different parameters for the constant tension cable reel. The mechanism is designed to automatically adjust the force required for cable pulling and maintain a constant maximum tension. Then the relationship between the moment and speed of each output shaft is analyzed, and the operation mode of the cable reel was explained. The experimental results show that the proposed...