Journal of Micromanufacturing最新文献

{"title":"Design and development of additivemanufactured multi-channel brachytherapy applicators for cancer treatment","authors":"Shahi Nabhan A. K., Kritik Saxena, Niyas Puzhakkal, Dinesh Makuny, Jose Mathew, D. Lawrence K.","doi":"10.1177/25165984231215888","DOIUrl":"https://doi.org/10.1177/25165984231215888","url":null,"abstract":"Additive manufacturing (AM) is emerging as an effective manufacturing technology that benefits the medical field with its ease of quickly realizing complex designs. Brachytherapy is a process to cure cancer patients through a high dose rate of gamma radiation. This work aimed at AM-based development of multi-channel vaginal and penile brachytherapy applicators for selectively treating cancer cells in a direction sideways to the applicator rather than the uniform radiation dose possible around the conventional applicator used in cancer treatment. An analytical model was proposed to predict the maximum surface temperature on applicators during Ir-192 source radiation. Also, the predicted values of multi-physics-based finite element method simulation were experimentally validated using a thermal imaging camera. Thermal imaging is a non-contact measurement that is found superior to the brachytherapy scale to position radioactive sources inside the applicator. Experimentally examined multi-channel applicator shows dosimetry advantage in effective radiation control and shows promise of curing cancerous cells with minimal effects on normal cells.","PeriodicalId":129806,"journal":{"name":"Journal of Micromanufacturing","volume":"270 9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139799391","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Process parametric optimization of fused deposition modeling for manufacturing of acrylonitrile butadiene styrene parts","authors":"Neel Kamal Gupta, P. K. Rakesh, Vikas Rastogi, Inderdeep Singh","doi":"10.1177/25165984241228088","DOIUrl":"https://doi.org/10.1177/25165984241228088","url":null,"abstract":"Additive manufacturing has been a revolution in the last decade and has led to a number of product innovations. Rapid prototyping (RP) has significantly reduced the product development cycle time and RP techniques are now replacing many conventional plastic processing techniques where production volume is not an issue. In order to ascertain the utility of additive manufacturing techniques for the development of fully functional parts, it’s important to establish the optimal set of process parameters for achieving maximum mechanical performance. In the current experimental investigation, the dogbone-shaped parts of acrylonitrile butadiene styrene (ABS) were fabricated by the fused deposition modeling (FDM) process. The process parameters were optimized for dogbone-shaped specimens fabricated by the FDM process. Among the parameters, it has been found that orientation and infill density are the most dominant factors affecting the tensile strength of FDM parts printed with ABS material.","PeriodicalId":129806,"journal":{"name":"Journal of Micromanufacturing","volume":"7 28","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139801544","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Design and development of additivemanufactured multi-channel brachytherapy applicators for cancer treatment","authors":"Shahi Nabhan A. K., Kritik Saxena, Niyas Puzhakkal, Dinesh Makuny, Jose Mathew, D. Lawrence K.","doi":"10.1177/25165984231215888","DOIUrl":"https://doi.org/10.1177/25165984231215888","url":null,"abstract":"Additive manufacturing (AM) is emerging as an effective manufacturing technology that benefits the medical field with its ease of quickly realizing complex designs. Brachytherapy is a process to cure cancer patients through a high dose rate of gamma radiation. This work aimed at AM-based development of multi-channel vaginal and penile brachytherapy applicators for selectively treating cancer cells in a direction sideways to the applicator rather than the uniform radiation dose possible around the conventional applicator used in cancer treatment. An analytical model was proposed to predict the maximum surface temperature on applicators during Ir-192 source radiation. Also, the predicted values of multi-physics-based finite element method simulation were experimentally validated using a thermal imaging camera. Thermal imaging is a non-contact measurement that is found superior to the brachytherapy scale to position radioactive sources inside the applicator. Experimentally examined multi-channel applicator shows dosimetry advantage in effective radiation control and shows promise of curing cancerous cells with minimal effects on normal cells.","PeriodicalId":129806,"journal":{"name":"Journal of Micromanufacturing","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139859568","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Atomic scale insights into material removal mechanisms in nanoscale machining of copper beryllium","authors":"A. Sharma, Amit Kumar","doi":"10.1177/25165984231203091","DOIUrl":"https://doi.org/10.1177/25165984231203091","url":null,"abstract":"The heterogeneous nature of the copper beryllium (CuBe) workpiece because of the presence of hard particles tends to affect material removal. When machining a CuBe material, it is anticipated that the mechanism of cutting and surface formation may differ from those seen when cutting a homogenous Cu material. Although these mechanisms are popular for the diamond turning of homogeneous materials, they have not been thoroughly studied in relation to CuBe alloys, which contain hard beryllium precipitates. Therefore, the effect of hard particles in the workpiece specimen on the nano-regime diamond turning of CuBe alloy needs to be understood. To explain the influence of Beryllium (Be) particles on the cutting tool and the workpiece surface, a molecular dynamics (MD) simulation was performed. It is revealed that the material removal mechanism in the case of CuBe is phase-dependent. Ductile machining is dominant in the Cu phase, and brittle fracture is dominant in the Be rich phase. It is also observed that the a/r ratio equal to 1 is suitable for cutting in the Cu phase and for ductile regime machining conditions in the Be phase. The a/r ratio higher than 1 causes higher cutting forces, and thus shear plane cutting takes place, which leads to a higher amount of material removal.","PeriodicalId":129806,"journal":{"name":"Journal of Micromanufacturing","volume":"12 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138979384","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Studies on fabrication of protruded multi-shaped micro-feature array on AA 6063 by laser micromachining","authors":"Saravanan Murugayan, Simson D, Samarjeet Chanda, K. S","doi":"10.1177/25165984231196354","DOIUrl":"https://doi.org/10.1177/25165984231196354","url":null,"abstract":"Miniaturization of parts of devices is the driving force for fabrication of micro-features. In this study fabrication of protruded multi-shaped micro-feature array on AA 6063 is attempted by laser micromachining. For fabricating the protruded microfeatures, the process parameters such as laser power, scanning speed and frequency of the laser beam have been optimized by considering track depth, width, and surface roughness as the output parameters. Three different cross sections in the tracks such as pileup section, W-section, and Gaussian groove section are observed. It is found that shape of the tracks vary with the scanning speed for the same power and frequency of the laser beam. The tracks of pileup section, W-section, and Gaussian groove section were produced for a laser scanning speed of 100 mm/s, 200mm/s, and 300 mm/s, respectively. Further, a laser-thermal ablative model is developed for predicting the depth of the single track and simulated using COMSOL® Multiphysics. The predicted track depths obtained from the simulations have good agreement with experimental results. In order to produce the protruded microfeatures of different shapes, multiple track analysis is done by fabricating the single tracks adjacent to one another by overlapping them, and the overlapping distance is optimized. The protruded microfeatures are then fabricated by removing the surrounding material for different scanning strategies and it is found that the contour strategy produced the features with minimal form error. Finally, it is demonstrated that an array of protruded micro-features of polygon (square, hexagon), and circular cross sections can be fabricated using the optimized process parameters for various applications.","PeriodicalId":129806,"journal":{"name":"Journal of Micromanufacturing","volume":"34 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138591957","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mechanism of surface modification on monocrystalline silicon during diamond polishing at nanometric scale","authors":"Prabhat Ranjan, Tribeni Roy, A. Sharma","doi":"10.1177/25165984231206690","DOIUrl":"https://doi.org/10.1177/25165984231206690","url":null,"abstract":"The demand for polished silicon wafers has increased significantly in recent years to cater to the development of the semiconductor industry. For example, polished silicon wafer has direct applications in integrated circuits, radio frequency amplifiers, micro-processors, micro-electromechanical systems, etc. To carry out mechanical polishing, lapping, grinding, or single-point diamond turning of silicon, diamond abrasives were extensively used before the implementation of chemo-mechanical polishing. During the diamond-based polishing, a few problems have already been identified, such as the formation of an amorphous phase, heat-affected zones, low material removal, etc. Some research work has also reported that nano-structured abrasives lead to a thin layer of the amorphous phase and a better material removal rate. In the same direction, a molecular dynamics simulation is carried out in this paper to investigate the mechanism of material removal from monocrystalline silicon during the diamond-abrasive-based polishing process. The present work is mainly focused on the dynamics of material removal phenomena near the abrasive particles at the nanometric scale by considering stress, lattice, cohesive energy, etc. This reveals that a higher value of indentation force results in surface buckling, which creates a zone of both compressive and tensile stresses, which increases the coordination number and forms β-silicon just ahead of the abrasive particle. This mechanism happens by developing a β-silicon phase on the surface with a thickness beyond a certain value of indentation force on the zone of compression. Buckling on this phase happens due to stress localisation in compression, as the flow stress of this phase is less than that of diamond cubic lattices. To avoid the mechanism of surface buckling and process silicon material on the surface, the indentation force needs to be maintained below a critical value. In the present case, it was found that the indentation force of less than or equal to 190 nN for the abrasive size of ϕ8 nm does the material removal by surface processing only without surface buckling. It was also found that surface processing helps to reduce the depth of the amorphous layer significantly without compromising the material removal rate or the generation of a wavy surface. Thus, the present mechanism will help in the polishing of silicon with minimum defects and reduce processing time for the final stage of polishing towards manufacturing ultra-smooth and planer surfaces.","PeriodicalId":129806,"journal":{"name":"Journal of Micromanufacturing","volume":"36 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139267999","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Salient aspects on micro-electrical discharge machining of nitinol for cardiovascular applications","authors":"S. Purushothaman, M. S. Srinivas, N. Venkaiah, M. R. Sankar","doi":"10.1177/25165984231206689","DOIUrl":"https://doi.org/10.1177/25165984231206689","url":null,"abstract":"Micro-electrical discharge machining (micro-EDM) is a widely used technique for producing complex geometries with high precision in metals, including nitinol (NiTi) alloys. This review provides insights into the process parameters, electrode material, and surface integrity for the micro-EDM of NiTi. The pulse duration, pulse frequency, and discharge current are critical parameters that affect the machining performance of NiTi. Copper-tungsten and tungsten carbide are commonly used electrode materials for micro-EDM of NiTi. The surface integrity of the machined surface is an essential consideration for biomedical applications. There is a pressing need for the investigation of the microstructure and phase transformation of NiTi after micro-EDM to understand the influence of machining on the material properties. This review provides valuable information for researchers and engineers to optimize the machining performance and improve the material properties of NiTi for biomedical applications.","PeriodicalId":129806,"journal":{"name":"Journal of Micromanufacturing","volume":"56 3-4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139270047","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ultrasonic elliptical vibration-assisted micro-texturing","authors":"Chen Zhang, V. Silberschmidt","doi":"10.1177/25165984231175586","DOIUrl":"https://doi.org/10.1177/25165984231175586","url":null,"abstract":"Various micro-texturing techniques are used to generate the surface topography. However, conventional methods are inherently difficult to adapt for efficient production of micro-textures on cylindrical surface. In this paper, an ultrasonic elliptical vibration-assisted (UEVA) cutting technique based on discussed control parameters is proposed to fabricate the micro-texture on cylindrical surfaces. In the proposed UEVA micro-texturing method, a control model is developed based on shape and distribution parameters for the micro-texture. The locus of UEVA cutting is actively controlled with this EVA model to generate the micro-texture. The simulation model based on the proposed micro-texturing method is developed to predict the topography of the generated micro-texture. The cutting experiment to produce the micro-texture is conducted to verify the established control model. A comparison of the obtained results shows that the proposed UEVA micro-texturing method can be used to predict and generate the micro-texture on the cylindrical surfaces.","PeriodicalId":129806,"journal":{"name":"Journal of Micromanufacturing","volume":"115 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132689879","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Investigations on burr formation mechanisms and surface quality when micro-milling duplex stainless steel (UNS S32205)","authors":"A. G. dos Santos, M. B. da Silva, M. Jackson","doi":"10.1177/25165984231173186","DOIUrl":"https://doi.org/10.1177/25165984231173186","url":null,"abstract":"Micromilling is a high-precision machining process that has been widely used to produce components or provide micro-characteristics on macro-sized parts. It is imperative that surfaces generated by micro-machining have high specifications and quality, translated as low surface roughness and a minimum number of burrs. Deburring processes are difficult to control, and the need to assure process quality motivated a study of this work focused on burr formation and surface quality when micromilling duplex stainless steel (UNS S32205). For this purpose, slots were machined using a 4-axis computer numerically controlled (CNC) micromachining center equipped with TiN-coated carbide microtools (381 µm diameter (0.015 inch)). Optimization experiments were performed in order to choose the most suitable cutting conditions. The measurements of burr height and surface roughness were made using a profilometer. In addition, milled slots were analyzed using a scanning electron microscope (SEM). The results showed that top burrs were dominant, and the main types presented on the up-milling side were feather burrs and primary burrs. On the down-milling side, burrs presented a rather irregular shape. The width of the root of the burr presented values very close to the size of the metallurgical phases of the material, and burrs formed at distances that are comparable to the spacing between both phases, such as, α-ferrite and γ-austenite. Surface roughness is higher when using increased cutting speeds, implying that lower speeds produce a measure of surface roughness in line with component specifications that appears to be dependent on the type of burr formed during milling and associated tool wear.","PeriodicalId":129806,"journal":{"name":"Journal of Micromanufacturing","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126247153","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Compensation for Merchant’s Circle Diagram to predict cutting force in orthogonal micro turning","authors":"Arnab Das, Shri Narayan Agnihotri, Vivek Bajpai","doi":"10.1177/25165984231171896","DOIUrl":"https://doi.org/10.1177/25165984231171896","url":null,"abstract":"Cutting force for conventional orthogonal machining can be predicted by Merchant’s Circle Diagram (MCD) considering the shearing action of chip formation. However, the effect of plowing action is significant for micro turning, which has not been considered in MCD. Therefore, a large error has been observed in the prediction of cutting force in micro turning by MCD theory. In this study, a compensated model has been developed for orthogonal micro turning based on MCD. The theory has taken shearing and plowing actions into consideration. The compensated model involved material flow stress, cutting parameters, and tool geometry, including cutting edge radius. This model has predicted tangential cutting force with an average prediction error of 3.75% for micro turning of Ti6Al4V, whereas the average prediction error was 14.9% for axial cutting force.","PeriodicalId":129806,"journal":{"name":"Journal of Micromanufacturing","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117023714","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}