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检索条件"丛书名=Lecture Notes in Mechanical Engineering"

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Development of a Three-Dimensional CFD Model to Determine Convective Heat Transfer During Orthogonal Cutting 14th

Development of a Three-Dimensional CFD Model to Determine Co...

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14th International Conference on Computational Heat and Mass Transfer (ICCHMT)

作者： Wilker, Julius Goettlich, Tim Helmig, Thorsten Kneer, Reinhold Rhein Westfal TH Aachen Inst Heat & Mass Transfer Augustinerbach 6 Aachen Germany

ISBN: (纸本)9783031672408;9783031672415

During machining, most of the process energy dissipates into process heat, which leads to high temperature gradients, especially in the cutting zone that forms between tool and workpiece. High temperature gradients lead to thermal stresses in tool and workpiece and reduce the overall manufacturing quality. Therefore, cutting fluids are commonly used to decrease high local temperatures at the tool-workpiece interface. In an earlier approach, a two-dimensional CFD model has been developed to determine the resulting convective heat transfer coefficients between tool and cutting fluid. The results of this simulation reveal a fluid stagnation near the cutting zone. This effect is expected to be overestimated by the flow restrictions of the two-dimensional domain, leading to an underestimation of the local convective heat transfer. In order to model the flow behaviour and local convective heat transfer coefficients more accurately, this work aims to extend the existing CFD model to a third spatial dimension. Compared to the two-dimensional setup, the simulation results show higher overall convective heat transfer coefficients resulting from the reduced stagnation effect of the fluid near the cutting zone. Following, a sensitivity analysis is performed regarding the impact of varying Reynolds and Prandtl numbers on the convective heat transfer. Further, the influence of chip evolution on the flow behaviour is considered by performing simulations with varying chip geometries. Finally, the results of the sensitivity analysis are summarized in a Nusselt correlation.

关键词： 3D CFD Simulation Conjugate Heat Transfer Convective Heat Transfer Nusselt Correlation Machining Orthogonal Cutting

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Towards an Automatic Strategy for Conformal Cooling Design 32nd

Towards an Automatic Strategy for Conformal Cooling Design

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32nd International Conference on Flexible Automation and Intelligent Manufacturing

作者： Rocha, Sofia B. Martins, Goncalo Neto, Victor Oliveira, Monica S. A. Univ Aveiro Ctr Mech Technol & Automat TEMA Dept Mech Engn P-3810193 Aveiro Portugal Intelligent Syst Associate Lab LASI Guimaraes Portugal

ISBN: (纸本)9783031382406;9783031382413

The continuous demand for high-quality polymeric parts introduced additive manufacturing (AM) as a solution to produce new temperature control systems (TCS) in injection molds, which has proven to improve part quality and minimize cycle time. Nevertheless, the design of an effective TCS is challenging, and project rules to comply with part specifications, without compromising the tool durability are required. Parametric analysis is paramount to understand the relative influence of parameters such as channel location, geometry, flow conditions, on the heat extraction rate, enabling to establish the proper foundations towards the development of an automatic strategy for TCS design. The present work presents a parametric study, supported by process optimization strategies, to assess the influence of channel relative position and channel geometry on the mold heat dissipation. The results have shown that rectangular channels obtained better heat dissipation, with consequent better part quality.

关键词： Injection Molding Conformal Cooling Channel Channel Parameters Parametric analysis

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Evaluation of Forming Factors for Titanium Gr. 2 Alloy Sheets with Multistage SPIF Process 14th

Evaluation of Forming Factors for Titanium Gr. 2 Alloy Sheet...

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14th International Conference on Numerical Methods in Industrial Forming Processes (NUMIFORM)

作者： Mulay, Amrut Sameer, Vadher Sardar Vallabhbhai Natl Inst Technol Dept Mech Engn Surat 395007 India

ISBN: (纸本)9783031580086;9783031580062;9783031580055

In the vast prospects for automation, incremental sheet forming (ISF) is a reliable sector on which the industry may focus in the future. Due to spring back, poor surface finish, and production time, ISF has yet to apply in broad prospects in mainstream high-value manufacturing sectors. ISF performance is affected by process factors such as vertical step depth, feed rate, spindle speed, forming angle, tool path, intermetallic friction, and bending forces. One of the variants of ISF processes is Single Point Incremental Forming (SPIF). The formability of the SPIF process increases by incorporating certain intermediary phases known as Multistage Incremental Sheet Forming (MSPIF). The strain hardening effect that emerged in the distorted sheet alters its deformability. The integration of intermediate results into some new process parameters to address in this work includes the number of stages, angle interval between the stages, and tool diameter. The present research focuses on the influence of process parameters on section thickness, equivalent plastic strain, and spring back. A simulation study of various process parameters of multistage forming and their effects on multistage incremental forming performance were evaluated.

关键词： Titanium alloy MSPIF Thickness distribution PEEQ Multistage forming MoS2

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Thermal Profile Prediction for Ball Grid Array Solder Joints Using Physic-Informed Artificial Neural Network 32nd

Thermal Profile Prediction for Ball Grid Array Solder Joints...

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32nd International Conference on Flexible Automation and Intelligent Manufacturing

作者： Zhang, Zhenxuan Li, Yuanyuan Yoon, Sang Won Park, Seungbae Won, Daehan SUNY Binghamton Binghamton NY 13901 USA

ISBN: (纸本)9783031382406;9783031382413

According to comparable research studies, the reflow process has been identified as the most critical process to the Printed Circuit Board (PCB) solder joint quality in surface mounting technology (SMT) manufacturing. The ball grid array (BGA) are packages with one face partly covered with pins in a grid pattern connected to the pads on PCBs. Compared to passive components, the solder joints for BGAs are at the bottom of the packages. The joints for BGAs are harder to be heated because the convection heat from the air is blocked by the cover case of the BGA and relies more on the parasite conduction heat from the boards and the package cover. To ensure the quality of the solder joints, the solder paste manufacturers provide specifications, along with target temperature curves (i.e., thermal profiles), to secure the solder joint quality. One of the significant challenges for the BGA-related thermal study is to measure the temperature of the joints underneath the package and how to predict the temperature for the joints. In this study, (1) a physics-informed artificial neural network (PINN) was proposed for temperature prediction, and (2) the experiment was conducted to measure the solder joint temperature underneath the BGAs for validation. The prediction accuracy is higher than 96% in terms of the R-2 fitness to the actual thermal profile.

关键词： surface mounting technology (SMT) ball grid array (BGA) thermal profile prediction physic-informed artificial neural network (PINN)

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Numerical Investigation of the Hole Saw Tool Geometry Effects on Drilling of CFRP 10th

Numerical Investigation of the Hole Saw Tool Geometry Effect...

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10th International Conference on Design and Modeling of mechanical Systems (CMSM)

作者： Hassouna, Amira Mzali, Slah Mezlini, Salah Univ Monastir Natl Engn Sch Monastir Mech Engn Lab Monastir Tunisia

ISBN: (纸本)9783031650062;9783031650079

Drilling in Carbon Fiber Reinforced Polymer (CFRP) composites is of paramount importance, especially in industries like aerospace that heavily rely on these advanced materials. The precision and integrity of the drilled holes play a vital role in determining the overall structural performance and reliability of composite components. This study presents a comprehensive numerical investigation into the effect of hole saw tool geometry and cutting parameters on the drilling of Carbon Fiber Reinforced Polymer (CFRP) composites. The analysis aims to optimize the drilling operation by varying the rake angle and the feed rate. To fulfil this, a finite element model is developed using Abaqus explicit software. The outcomes reveal that the rake angle has a negligible effect on the thrust force and the workpiece damage. In contrast, the feed rate significantly affects the thrust force, with a noticeable increase as the feed rate is raised. Finally, it can be observed that the workpiece damage is not influenced by the feed rate.

关键词： CFRP Rake angle feed rate Thrust force workpiece damage

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Improving Life Cycle Assessment Accuracy and Efficiency with Transformers 3rd

Improving Life Cycle Assessment Accuracy and Efficiency with...

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3rd International Conference on Advanced Surface Enhancement (INCASE)

作者： Zhao, Yang ASTAR Singapore Inst Mfg Technol INNOVIS 2 Fusionopolis Way Singapore 138634 Singapore

ISBN: (纸本)9789819986422;9789819986439

Life Cycle Assessment (LCA) is a methodology employed to evaluate the environmental effects of goods or services over their complete life cycle. LCA reports are key for the industry to assess their contribution on the sustainability. It is a complex and time-consuming process that can be improved with the use of deep learning models due to a large amount of data are involved in prediction. Transformers have been successful in natural language processing and can also be applied to numerical data to predict environmental impacts. By detecting the phases in a product's life cycle that generate the most significant environmental consequences and automating the data compilation and analysis procedures, they can reduce the time and expense connected with LCA. The use of transformers for LCA analysis has the potential to improve the accuracy and efficiency of sustainability assessments, providing more comprehensive information about environmental impacts. Through experimenting with real-world datasets, the proposed transformer framework has been shown to effectively contribute to making informed sustainability-related decisions by providing comprehensive information about environmental impacts. This has the potential to benefit a wide range of industries and sectors, enabling more sustainable development and decision-making.

关键词： Life cycle assessment LCA Transformer Sustainability

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Information Extraction from Time Series in the EDM Drilling Process 14th

Information Extraction from Time Series in the EDM Drilling ...

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14th International Conference on Numerical Methods in Industrial Forming Processes (NUMIFORM)

作者： Jazdzewski, Tomasz Regulski, Krzysztof Bulka, Adam Malara, Pawel Czeszkiewicz, Adrian Trajer, Marcin AGH Univ Krakow Krakow Poland Lukasiewicz Res Network Inst Aviat Warsaw Poland Warsaw Univ Technol Fac Mat Sci & Engn Warsaw Poland

ISBN: (纸本)9783031580086;9783031580062;9783031580055

Electrical discharge machining (EDM) allows to obtain small holes with the high efficiency and high quality. Such features are most common in jet engine turbine airfoils. The main problem of the analysis is detection of a moment when the machine should stop the drilling process-the breakthrough detection. Machine learning applications requires that data and models to be prepared by specialists that can extract the most important information from an input data and choose most suitable Artificial Intelligence (AI) algorithm for particular case. This Article describes an experiment on how to extract valuable information from heterogeneous time series data with various sources (which is popular in an industry 4.0-Internet of Things) from the EDM drilling process. EDM process is conducted by a Computerized Numerical Control (CNC) drilling device that measures the position of the electrode, drilling speed, Additional sensor, monitors impulses current and voltage. The research is focused on classic AI algorithms (decision tree, random forest and eXtreme Gradient Boosting (XGBoost)) which provide fast training and possibility to check more hyperparameters in a time than neural networks algorithms. It is also described how feature extraction can high up AI algorithm predictions.

关键词： Times Series Feature extraction EDM drilling Machine learning

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Microstructure and Magnetic Properties of Non-oriented Electromagnetic Steel Sheets by Burnishing Method 3rd

Microstructure and Magnetic Properties of Non-oriented Elect...

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3rd International Conference on Advanced Surface Enhancement (INCASE)

作者： Kobayashi, Yuji Saito, Yuta Okada, Masato Watari, Ryota Sintokogio Ltd 180-1 KomakiOhgi Cho Toyokawa Aichi 4411205 Japan Univ Fukui Fac Engn Bunkyo 3-9-1 Fukui 9108507 Japan

ISBN: (纸本)9789819986422;9789819986439

Burnishing is a process in which a cylindrical or hemispherical tool made of a hard material is pressed against a workpiece with a rough cut surface to obtain a smooth surface. Compared to shot peening, the process stress is easier to control and more precise. Burnishing is usually used to improve surface roughness. Depending on the processing conditions, it is possible to affect the interior of the material and obtain an effect similar to shot peening. Electromagnetic steel sheet is a material that is easy to observe changes in crystal characteristics because it is close to pure iron in terms of material composition and has large crystal grains. When the crystals change, the magnetic properties also change. Therefore, it is a material that is easy to evaluate in various aspects. In this study, the changes that occur when electromagnetic steel sheets are processed by inclined burnishing was investigated.

关键词： Burnishing Shot peening Electromagnetic steel Crystal characteristics

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Effects of Fractal Cantor Structured Hot Surface on Thermal Management System 14th

Effects of Fractal Cantor Structured Hot Surface on Thermal ...

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14th International Conference on Computational Heat and Mass Transfer (ICCHMT)

作者： He, J. J. Chu, W. X. Wang, Q. W. Xi An Jiao Tong Univ Sch Energy & Power Engn MOE Key Lab Thermofluid Sci & Engn Xian 710049 Shanxi Peoples R China

ISBN: (纸本)9783031666087;9783031666094

Phase change material (PCM) has been implemented in thermal management systems. However, the heterogeneous interface between hot surface and PCM may lead to non-negligible thermal slip, resulting in alleviated energy storage efficiency. This study investigates the heat transfer performance of PCM at fractal Cantor structured hot surfaces. A total enthalpy-based lattice Boltzmann method is developed to study the pore-scale solid-liquid phase change problems with the natural convection. The effects of fractal dimension, Ste and gravity on heat transfer performance are analyzed. Meanwhile, the local velocity distribution and interfacial heat transfer performance are evaluated and regarded as the criteria. Results show that the presented results are in good agreement with experimental results. Fractal Cantor structure can significantly reduce the average thermal slip length, thus enhancing the heat transfer between heat source and PCM. As the fractal dimension increases, the localized convection can be gradually revolutionized into widespread convection, resulting in a more uniform melt-front evolution along the horizontal direction. As a result, the total melting time can be minimized by 5% with the fractal dimension of 3. Elevating Ste and gravity can significantly increase the flow rate of liquid PCM, which leads to enhanced convective heat transfer strength. Between them, gravitational acceleration yields the most significant enhancement in heat transfer performance.

关键词： Phase change material Fractal Cantor structure Melt-front Thermal management

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Numerical Study of the Triple Line Behavior for a Two-Phase Flow in a Rectangular Microchannel 14th

Numerical Study of the Triple Line Behavior for a Two-Phase ...

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14th International Conference on Computational Heat and Mass Transfer (ICCHMT)

作者： Boubendir, Lynda Chikh, Salah Tadrist, Lounes USTHB LTPMP Fac Mech & Proc Engn Algiers 16111 Algeria Aix Marseille Univ CNRS Lab IUSTI UMR 7343 F-13453 Marseille France

ISBN: (纸本)9783031666087;9783031666094

The present study investigates the behavior of the contact line for a two-phase flow inside a rectangular microchannel. It invokes the displacement of a wetting fluid by another non-wetting fluid to analyze the dynamics of the triple line created by the contact of two immiscible fluids and the channel wall. We consider a horizontal rectangular duct of 0.5, 1, and 2 mm in height and 12 mm in length initially containing the wetting fluid at rest. The non-wetting fluid is injected with a uniform axial velocity of 0.04 m/s. Both fluids are considered Newtonian and incompressible in a transient state. The open-source code, OpenFOAM, is employed with a single-fluid model to solve the continuity and momentum equations along with the volume of fluid (VOF) method for interface tracking to obtain the flow field. The analysis of the influence of several factors on the interface evolution, the fluids displacement, and the dynamics of the contact line is carried out. The numerical results show that the dynamics of the triple line are substantially influenced by the nature of the fluids, the magnitude of the surface tension, the dimensions of the channel, and the static contact angle.

关键词： Contact line Surface tension Wetting fluid Interface

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