1,720,986 research outputs found
Back chip temperature in environmentally conscious turning with conventional and internally cooled cutting tools
No full textCentral to machining processes is the interaction between the tool insert and the chip of material removed from the blank. Chip-insert interaction occurs when the chip slides on the rake face of the insert. Heat is generated by the friction inherent to this sliding process. The temperature in the cutting zone of both the insert and the chip rises, usually facilitating adhesion, diffusion, and more complex chemical and physical phenomena between the insert and the chip. These effects accelerate the insert wear, ultimately undermining the tool life. Thus, a number of methods have been developed to control heat generation. Most typically, metal working ?uids are conveyed onto the rake face in the cutting zone. However, this solution may be not ideal from the point of view of cost, the environment, and contamination of the part, which may be unacceptable, for example, in healthcare and optical applications. In this study, micro?uidic structures internal to the insert are examined as a means of controlling the heat generation.Conventional and internallycooled tools were compared in dry turning of AA6082-T6 aluminum alloy in two 3?3 factorial experiments of different machining conditions. Statistical analyses support the conclusion that chip temperature depends only on the depth of cut,and not on the feed rate or cutting speed. They also show that the bene?t of cooling the insert internally increases as the depth of cut increases. Therefore, internallycooled tools can be particularly advantageous in roughing operations
Jalin hubungan baik UMP dan MUJ anjur persidangan ICAMEN
Full text linkJaipur, India, 9 Mac- Penganjuran persidangan antarabangsa International Conference on Advanced in Mechanical Engineering and Nanotechnology (ICAMEN 2019) merupakan hasil kerjasama baik pihak Universiti Malaysia Pahang (UMP) dan Manipal University Jaipur (MUJ) yang berlangsung baru-baru ini di Jaipur, India
UMP and MUJ hosted ICAMEN conference
Full text linkUniversiti Malaysia Pahang (UMP) and Manipal University Jaipur (MUJ) jointly organised the International Conference on Advances in Mechanical Engineering and Nanotechnology (ICAMEN 2019) on March 9, 2019
Investigation of design space in manufacturing meta-biomaterials by additive manufacturing
Full text linkTopology features such as interconnectivity, pore shape and size, porosity, struts thickness, and used materials play the key roles for mechanical and biological properties of meta-biomaterials structures. However, the influences of morphological geometries on the mechanical and biological properties are not certainly intuitive. This paper develops parametric model that use to visualize the morphological geometries of unit cell of meta-biomaterials on design space that governing the manufacturing limitation, mechanical and biological requirements. The selected samples within design spaces tested to determine manufacturing accuracy and effective elastic modulus by finite element analysis. The geometries discrepancies between designed models and manufactured samples obtained percentage of average errors of 13% for diamonds structures and 21% for square structures. The proposed technique yielded average error reduced to 74.4% for diamond structures and 44.4% for square structures of effective elastic modulus from theoretical calculation. The approach and the implications of the results discussed in the context of mechanical and biological criteria with highlight of advantages and limitations of meta-biomaterials manufactured by additive manufacturing for orthopaedic implant
Progressive tool flank wear and surface roughness when turning AISI 1017 mild steel using reduced thickness inserts in finishing cutting conditions
No full textPhysical evaluations of Co-Cr-Mo parts processed using different additive manufacturing techniques
No full textProcess improvement of multiple agarwood oil extractions using low-cost multi-channel temperature data logger
Full text linkThe quantity of oil and chemical composition of the Agarwood essential oil should be evaluated to determine the performance of an extraction system. The aim of this work was to investigate the improvement to the three hydrodistillation (HD) systems when heat transfer control (HTC) approach using low-cost portable data logger with multi-temperature sensors is applied. The study focuses on the quantitative and qualitative characteristics of extracted essential oil from inoculated Agarwood for the real-time monitored HD compared to a conventional hydrodistillation (CHD). The extractions by conventional and HTC-ed HD procedures were carried out by supplying heat from liquefied petroleum gas (LPG); the ratio of the raw material to be extracted and the liquid solvent was 0.1 g·mL-1 and the extraction time was 72 hours. The compositions of the extracted essential oils (using HTC-ed HD and CHD) were assessed using gas chromatography with a flame ionization detector (GC–FID). The results of the extraction processes showed that the extraction of inoculated Agarwood essential oil assisted by multi-channel data logger was faster and produced higher yields compared to the CHD without a process monitoring device. Further, the testing of the chemical properties of the Agarwood oil showed that essential oil obtained by HTC-ed HD had better quality compared to the oil obtained by conventional HD. The implementation of real-time thermal management in HTC-ed HD technology in Agarwood essential oil production industry is therefore of great importance
Thermal management and biocompatibility in dry machining: An experimental study of ZrO2-based cutting tool for bone machining
No full textThis paper aims to assess the thermal properties and biocompatibility of zirconia-based bio ceramic cutting tools for bone surgery compared to stainless steel (SS316L) tools. Because of their biocompatibility, materials such as zirconia (ZrO2) are now widely utilized to reconstruct and replace bone tissue. The study compares wet and dry machining to analyze the effects of temperature and cell behaviour. By performing a quantitative MTT (yellow 3-(4,5-dimethylthiazole-2-yl)-2,5-diphenyltetrazolium-bromide) proliferation assay, the current study showed that ZrO2 had higher cell viability and metabolic activity than SS316L. The experiments included primary chondrocyte cells from chicken femoral condyles incubated at 37 °C and 5 % CO2 with increased cell survival and proliferation in the presence of ZrO2. Thermal performance was evaluated on a CNC vertical milling machine with the help of K-type thermocouples to measure the maximum (Tmax) and average (Tmean) temperature. ZrO2-based tools had resulted in lower Tmax and Tmean throughout the experiment regardless of the cutting parameters, which minimize the thermal injury and improve surgical results. Saline irrigation in wet machining helped in reducing temperature peaks, while dry machining had the advantages of not polluting the environment and being cheaper. Due to its low thermal conductivity and hardness, ZrO2 can be used as an effective material for metal tools in surgical operations to minimize thermal effect and increase the tool lifespan
A scientometric analysis of bone cutting tools & methodologies : Mapping the research landscape
Full text linkThis study undertakes a Scientometric analysis of bone-cutting tools, investigating a corpus of 735 papers from the Scopus database between 1941 and 2023. It employs bibliometric methodologies such as keyword coupling, co-citation, and co-authorship analysis to map the intellectual landscape and collaborative networks within this research domain. The analysis highlights a growing interest and significant advancements in bone-cutting tools, focusing on their design, the materials used, and the cutting processes involved. It identifies key research fronts and trends, such as the emphasis on surgical precision, material innovation, and the optimization of tool performance. Further, the study reveals a broad collaboration among researchers from various disciplines, including engineering, materials science, and medical sciences, reflecting the field's interdisciplinary nature. Despite the progress, the analysis points out several gaps, notably in tool design optimization and the impact of materials on bone health. This comprehensive review not only charts the evolution of bone-cutting tool research but also calls attention to areas requiring further investigation, aiming to inspire future studies that address these identified gaps and enhance surgical outcomes
Thermal management and biocompatibility in dry machining: An experimental study of ZrO2-based cutting tool for bone machining
Full text linkThis paper aims to assess the thermal properties and biocompatibility of zirconia-based bio ceramic cutting tools for bone surgery compared to stainless steel (SS316L) tools. Because of their biocompatibility, materials such as zirconia (ZrO2) are now widely utilized to reconstruct and replace bone tissue. The study compares wet and dry machining to analyze the effects of temperature and cell behaviour. By performing a quantitative MTT (yellow 3-(4,5-dimethylthiazole-2-yl)-2,5-diphenyltetrazolium-bromide) proliferation assay, the current study showed that ZrO2 had higher cell viability and metabolic activity than SS316L. The experiments included primary chondrocyte cells from chicken femoral condyles incubated at 37 °C and 5 % CO2 with increased cell survival and proliferation in the presence of ZrO2. Thermal performance was evaluated on a CNC vertical milling machine with the help of K-type thermocouples to measure the maximum (Tmax) and average (Tmean) temperature. ZrO2-based tools had resulted in lower Tmax and Tmean throughout the experiment regardless of the cutting parameters, which minimize the thermal injury and improve surgical results. Saline irrigation in wet machining helped in reducing temperature peaks, while dry machining had the advantages of not polluting the environment and being cheaper. Due to its low thermal conductivity and hardness, ZrO2 can be used as an effective material for metal tools in surgical operations to minimize thermal effect and increase the tool lifespan
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