 Subjects -> SCIENCES: COMPREHENSIVE WORKS (Total: 374 journals)
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- Study on Evaluation of Cutting Fluid Using End Face Cutting in Lathe
Machining-
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Abstract: Publication date: 26 March 2025
Source: Advances in Science and Technology Vol. 161
Author(s): Yuri Obata, Takekazu Sawa
Currently, functional tests and property tests are used to evaluate cutting fluid [1]. However, the problem is that the results obtained from above tests do not always match with each other because the insert tip is under extreme pressure and high temperature in actual machining. Therefore, a new cutting fluid evaluation method based on actual machining is needed. End face cutting in lathe machining is cutting workpiece from outside to center. In this study, rotation speed was fixed. In other words, cutting speed varies with the radius of workpieces and it is considered possible to clarify the effectiveness of cutting fluid at each cutting speed in a single cut.The performance of the cutting fluid was evaluated based on acceleration of cutting tool and surface roughness of workpiece. The following results were obtained. In steel materials, the acceleration of insoluble cutting oil was highest, and burnt insert tips were observed after the end face cutting. Insoluble cutting oil used in this study has a lower viscosity and a lower boiling point than mineral oils and esters. The highest acceleration of insoluble cutting oil is considered to be due to insufficient lubricating effect because of evaporation of it. No effect of insoluble cutting oil, mineral oils or esters was obtained on surface roughness. The acceleration of undiluted solution is higher than that of diluted solution and burnt insert tips were obtained. The cooling effect of undiluted solution is low because of less water. The highest acceleration of undiluted solutions is considered to be due to insufficient lubricating effect because of evaporation of it. In A5056, surface roughness of the diluted solution was higher at low cutting speed due to lack of lubricating effect. Differences in acceleration, surface roughness and insert tip were observed for each oil type, indicating the possibility of evaluating cutting fluid performance using the method proposed in this study.
PubDate: Wed, 26 Mar 2025 00:00:00 +010
- In-Line Concentration Monitoring of Water-Soluble Cutting Fluids Using an
Automatic Brix Meter-
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Abstract: Publication date: 26 March 2025
Source: Advances in Science and Technology Vol. 161
Author(s): Kenji Yamaguchi, Takeshi Gonda, Satoshi Sakamoto
Water-soluble cutting fluids are routinely used as coolants and lubricants in the metalworking process. The properties of these water-soluble cutting fluids change during operation. In the management of the properties of water-soluble cutting fluids, it is crucial to maintain the concentration within an appropriate range. In typical manufacturing facilities, the concentration of water-soluble cutting fluids is measured using Brix. The commonly used Brix meters are of the sampling type. However, measuring the concentration of cutting fluids in numerous machine tools can be time-consuming. In addition, there has been a recent demand for automated measurement and management of concentration and data accumulation. In recent years, relatively inexpensive automatic Brix meters have become available in Japan. In this study, we tried to continuously measure the concentration of water-soluble cutting fluids using an automatic Brix meter. We installed an automatic Brix meter in a tank that continuously circulates 40L of water-soluble cutting fluid and measured it for several tens of days, confirming that it can measure stably. However, depending on the type of water-soluble cutting fluid, the measurement results may become unstable immediately after starting the measurement. Therefore, it was found that the choice of the water-soluble cutting fluid to be used is also important for the concentration measurement by the automatic Brix meter.
PubDate: Wed, 26 Mar 2025 00:00:00 +010
- Application of Artificial Neural Network to Control Accuracy Dimension of
3D Resin DLP Products-
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Abstract: Publication date: 26 March 2025
Source: Advances in Science and Technology Vol. 161
Author(s): Trong Hieu Bui, Van Viet Ma, Chiet Quan Han, Van Vu Le, Huu Nghi Huynh
Current devices using resin 3D printing technology are divided into three main lines, including: industrial, desktop and opensource. The use of desktop devices for producing end products is garnering significant attention thanks to several advantages. These include the capacity to utilize a variety of popular materials, affordable costs for both materials and components, and stable operation. However, some product quality categories such as surface properties, dimension and geometry accuracy, etc., of these devices depend greatly on the selection and adjustment of technological parameters. This article presents the process of building an Artificial Neural Network (ANN) model to control the dimension of test samples manufactured using Digital Light Processing (DLP) technology in three directions X, Y, Z. The testing process is designed according to the Face-centered central composite design (FCCCD) method with five input parameters. Test samples are chosen based on ASTM standards, produced using a desktop DLP resin 3D printer, and assessed with a Mitutoyo PJ-H3000F profile measuring instrument. Training results show that the ANN build model fits with the database and produces good predictions with the Mean Average Error (MAE) compared to actual data in the X direction being 0.038342, in the Y direction being 0.010258012, and in the Z direction being 0.012501036. The success of this research helps engineers and technicians reduce the time spent operating and calibrating related devices.
PubDate: Wed, 26 Mar 2025 00:00:00 +010
- A Study on the Simulation and the Experimentation to Improve the Energy
Efficiency of Servo-Controlled Hydraulic System-
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Abstract: Publication date: 26 March 2025
Source: Advances in Science and Technology Vol. 161
Author(s): Dinh Hai Vu, Triet Hung Ho, Khanh Dien Le, Dinh Huan Phan
Hydraulic systems are widely used in almost all industries. However, a significant drawback of hydraulic systems is large energy loss. One of the main reasons is the improper power design that causes excessive energy consumption by generating heat in the system, which reduces the equipment's lifespan and increases operating costs in production. In this study, we propose a power control system for hydraulic systems using servo control valves. The hydraulic station consists of a fixed displacement pump driven by an AC servo motor, which is controlled to change speed based on the feedback pressure from the load in order to control the pump's output power, thus also controlling the overall power of the system. The study begins with the proposal of the hydraulic system, followed by model establishment, simulation, experimental implementation in the workshop, and evaluation. The initial research results show that the system is capable of controlling power, improving energy efficiency, and ensuring the accuracy of the motion of actuator.
PubDate: Wed, 26 Mar 2025 00:00:00 +010
- Lighting Simulation for Visual Inspection System Using Patterned Area
Illumination-
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Abstract: Publication date: 26 March 2025
Source: Advances in Science and Technology Vol. 161
Author(s): Tadanori Sugino, Shunsuke Yokoyama, Takumi Matsuo
We have developed methodologies for the detection of microdefects on painted surfaces and the evaluation of machined surface quality through the use of the patterned area illumination. The objective of this study is to optimize illumination for surface inspection of products by reproducing the illumination situation using the patterned area illumination. In this study, a ray tracing method, which is a computer graphics technique, was employed to reproduce a scenario in which a product surface is illuminated by the aforementioned patterned area illumination. In the conventional ray tracing method, the patterned area illumination is not taken into account. Accordingly, the surface to be inspected was postulated to be a mirror surface, and the illumination pattern was projected onto it in order to reproduce the reflection of the illumination pattern on the inspection surface. The developed simulation method enables several key optimizations. Firstly, it allows for the optimization of the illumination device by reproducing the inspection surface with a curved surface. Secondly, it enables the data augmentation of teacher data for machine learning for a versatile defect detector. Thirdly, it allows for the optimization of the circular pattern used to estimate the shape of micro defects. Finally, it enables the reproduction of pattern projection onto a machined surface for the evaluation of machining quality of the machined surface.
PubDate: Wed, 26 Mar 2025 00:00:00 +010
- Determination of Geometrical Parameters to Balance the Pressure Drop of
Channels on a Microfluidic Chip-
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Abstract: Publication date: 26 March 2025
Source: Advances in Science and Technology Vol. 161
Author(s): Van Keo Dong, Xuan Hiep Tran, Quoc Nguyen Banh, Anh Son Tran, Huyen Lynh Duong
In the past few years, micro-droplets have been widely used in diverse fields of biological and chemical research, spanning from drug delivery and material synthesis to point-of-care diagnostics, digital PCR, and single-cell analysis. Droplet-based microfluidics offers a powerful platform for conducting complex experiments, screening processes, and analyses with enhanced precision, efficiency, and versatility. While creating droplets with uniform sizes is a common objective of microfluidics, it is not limited to producing droplets of a single size per chip. Creating microdroplets with different sizes on a microfluidic chip holds significant importance in various applications. This can provide flexibility in controlling chemical processes, biological reactions, or product quality. By controlling the size of the microdroplets, researchers can precisely regulate the release kinetics of the encapsulated substances, leading to improved therapeutic outcomes and reduced side effects for patients. In chemical analysis, microfluidic platforms can produce microdroplets of different sizes to enable high-throughput screening of chemical reactions or biological assays. By manipulating the droplet size, researchers can enhance reaction efficiency, increase sample throughput, and reduce reagent consumption, making the analysis process more cost-effective and time-efficient. To create microdroplets with different sizes on a microfluidic chip, adjusting process parameters such as pressure, flow rate, and channel design is an approach. In this research, geometrical parameters of the channel such as shape, size, and length are calculated to ensure the pressure drop from the inlet to the creation point droplets of each branch is the same, ensuring the stable operation of the system. The input solution in the research is glucose, which fully exhibits the behavior of a non-Newtonian liquid under defined conditions. The power law viscosity model is used to describe the rheological behavior of glucose liquids.
PubDate: Wed, 26 Mar 2025 00:00:00 +010
- Swing-up and Stabilizing Control of Inverted Pendulum with Restricted
Travel Width and Cart Speed-
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Abstract: Publication date: 26 March 2025
Source: Advances in Science and Technology Vol. 161
Author(s): Dai Kinoshita, Shigeki Nakayama, Itaru Matsumoto
The inverted pendulum is one of the most common experimental devices used to illustrate nonlinear control techniques, and various studies have been conducted on its swing-up and stabilization control from different perspectives. In real-world inverted pendulums, there are limitations on the displacement and velocity of the fulcrum, making it crucial to consider these constraints in control strategies.In this study, we propose a new swing-up and stabilization control method for the inverted pendulum that allows independent setting of the displacement and velocity limits of the fulcrum. The effectiveness of this method is verified through simulations and experimental tests.
PubDate: Wed, 26 Mar 2025 00:00:00 +010
- Empowering Die Selection in V-Bending: Insights from Decision Tree
Algorithms-
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Abstract: Publication date: 26 March 2025
Source: Advances in Science and Technology Vol. 161
Author(s): Huyen Lynh Duong, Hai Nam Tran
This study presents the application of tree-based algorithms to predict springback in the V-bending process of sheet metals, particularly for SUS304 material. V-bending, a critical process in metal forming, often faces challenges due to springback, which affects dimensional accuracy and product quality. Using virtual experiments conducted via ANSYS software, the study evaluates the influence of variables such as die angle, die radius, material thickness, and punch displacement on springback. Four tree-based algorithms—Decision Trees, Random Forest, Gradient Boosting Machines (GBM), and Extra Trees—were used to predict springback, with the Decision Tree model showing the highest accuracy (Mean Absolute Error MAE=0.35; Mean Square Error=0.20). The findings indicate that incorporating predictive models into die and punch displacement selection can enhance operational efficiency and ensure consistent product quality. This methodology offers a cost-effective and efficient approach to improving the precision of sheet metal V-bending processes, with potential applications across various sheet metal materials.
PubDate: Wed, 26 Mar 2025 00:00:00 +010
- A Research on the Simulation of Multi-Stage Single Point Incremental
Forming (MSPIF) Process on Stainless Steel Sheet SUS304 by Abacus Software
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Abstract: Publication date: 26 March 2025
Source: Advances in Science and Technology Vol. 161
Author(s): Trung Le Tran, Khanh Dien Le, Minh Tuan Pham, Thanh Nam Nguyen, Huu An Khang Dong
The paper focuses on the simulation process of Incremental Sheet forming (ISF) technology of the stainless steel SUS304 by the Multi-Stage Single Point Incremental Forming (MSPIF) with Abaqus software. Although being a popular stainless material with high mechanical and corrosion-resistant properties, widely used in various industries, forming of SUS304 steel by MSPIF technology still faces several challenges so in this study, with the simulation process, we have to determine the suitable values of influential factors to enhance the formability of SUS3043 sheet material. In the paper, with Abaqus software, we construct a model of simulation of SUS304 steel sheet by MSPIF technology to collect data for design of experiment (DOE). The results of the research provide valuable information on the forming process of SUS304 steel by MSPIF technology in order to improve the formability of the products.
PubDate: Wed, 26 Mar 2025 00:00:00 +010
- Effects of Groove Depth and Sheet Thickness on V-Bending Process Predicted
by Finite Element Analysis-
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Abstract: Publication date: 26 March 2025
Source: Advances in Science and Technology Vol. 161
Author(s): Anh Chuong Le, Viet Khai Le, Triet Hung Ho, Anh Son Tran, Quoc Nguyen Banh, Minh Tuan Ho
Springback is a significant challenge that affects forming accuracy in the sheet metal industry. This phenomenon occurs because elastic materials tend to revert to their original shape after the removal of deforming forces, leading to differences between the desired and final shapes of the metal. Currently, two primary methods are employed to investigate springback: physical experiments and numerical simulations. Physical experiments involve actual deformation of sheet metals to observe and measure springback. While these experiments can provide useful data and insights, they are often time-consuming and expensive, making them less possible for extensive studies or frequent iterations. On the other hand, numerical simulations offer a virtual modeling platform that can predict and analyze springback without the need for physical trials. These simulations enable engineers to refine the metal forming process for better end-product accuracy. Building on these existing methodologies, this research uses ANSYS software to conduct Finite Element Analysis (FEA) and reconstruct simulation data for V-bending technique. This study first compares the reconstructed data with data available from literature to evaluate the accuracy and reliability of our simulations. Subsequently, the validated numerical technique is applied to the V-bending process with groove, which primarily aims to reduce bending radius. The influence of adding grooves in the V-bending process was examined to assess its effects on bending radius and springback angle. Numerical results from V-bending simulations with grooves indicate promising control over springback, thereby enhancing quality of final product. The effects of sheet thickness and groove depth were also analyzed, revealing that greater groove depth increases the springback angle and reduces the initial bending radius. Furthermore, increased sheet thickness was observed to slightly increase the radius after springback, emphasizing the role of thickness in shaping bending behavior in V-groove processes.
PubDate: Wed, 26 Mar 2025 00:00:00 +010
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