Manufacturing Technology Journal, 2024 (vol. 24), issue 3
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...
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.
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...