Journal of Micromanufacturing最新文献_第7页

Pulsed Nd:YAG laser machining of nitinol: An experimental investigation 脉冲Nd:YAG激光加工镍钛诺的实验研究

Journal of Micromanufacturing Pub Date : 2021-05-25 DOI: 10.1177/25165984211015482

B. Muralidharan, K. Prabu, G. Rajamurugan

{"title":"Pulsed Nd:YAG laser machining of nitinol: An experimental investigation","authors":"B. Muralidharan, K. Prabu, G. Rajamurugan","doi":"10.1177/25165984211015482","DOIUrl":"https://doi.org/10.1177/25165984211015482","url":null,"abstract":"Nickel–Titanium (Ni-Ti) shape memory alloy, commonly called nitinol alloys, finds its primary application in the production of biomedical implants, mainly because of itsrare properties such asshape memory, superelasticity and superior biocompatibility. Laser cutting is anon-traditional machining process for the production ofparts with close tolerances andcomplex geometry. Electrical discharge machining (EDM) of nitinol is associated with more heat-affected zone (HAZ) and recast layer thickness. This article aims to study nitinol’s machining characteristics by alaser source with good beam quality to have a less HAZ, recast layer and striations. Experiments were designed and carried out using central composite designs (CCD) by a pulsed Nd:YAG laser. Analysis based on the different parameters chosen was conducted to determine the parameters; effects, including laser power, frequency and cutting speed concerning the surface roughness. From the results, it is observed that the presence of HAZ is measured up to1. 48 mm from the machined surface. The topography analysis reveals that the striation is identified at high speeds, with less pulse overlapping by columnar micro channels, which can be reduced at high pulse frequency.","PeriodicalId":129806,"journal":{"name":"Journal of Micromanufacturing","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133242972","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}

引用次数: 7

In-plane compression behavior of FDM-manufactured hierarchical and hybrid hierarchical hexagonal honeycombs for infrastructural safety applications 用于基础设施安全的fdm制造的分层和混合分层六边形蜂窝的面内压缩特性

Journal of Micromanufacturing Pub Date : 2021-05-25 DOI: 10.1177/25165984211015412

A. Mishra, Arvind Kumar

{"title":"In-plane compression behavior of FDM-manufactured hierarchical and hybrid hierarchical hexagonal honeycombs for infrastructural safety applications","authors":"A. Mishra, Arvind Kumar","doi":"10.1177/25165984211015412","DOIUrl":"https://doi.org/10.1177/25165984211015412","url":null,"abstract":"The infrastructure safety and response to the natural or man-caused calamities has always been a top consideration for any modern project. Impact energy absorption is one such area where advanced measures are being adopted to prevent any damage to the infrastructure from any impact caused by vehicles or other elements. Honeycomb structures have been primarily used in such high impact energy absorption applications. With the advent of modern additive manufacturing practices, drastic modifications to the simple honeycombs generally used are possible, thus expanding the reach and capability of these structures. In this article, in-plane uniaxial compression performance of hybrid and hierarchical hexagonal honeycombs has been studied in the context of strain energy absorption for in-plane impact such as the case of vehicle collision to the pillars of flyover or bridges. The polylactic acid (PLA) filament has been used to manufacture the honeycombs through fused deposition modeling (FDM) additive manufacturing technique. Simple hexagonal honeycombs have been studied first at low deformation speed to understand the deformation mechanics under uniaxial compression and its dependence on the unit cell dimensions and cell wall thickness. The effect of transition to the hybrid and hierarchical hexagonal honeycombs on the compression deformation has been highlighted next. While the hierarchical structures show better energy absorption capabilities and plateau stress, the hybrid hexagonal honeycombs show their high loadresistance. Dependence of the mechanical performance of such structures on the unit cell dimensions, orientation and wall thickness has also been examined through detailed experimental analysis.","PeriodicalId":129806,"journal":{"name":"Journal of Micromanufacturing","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129603904","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}

引用次数: 4

Fabrication of microfluidic channel of polydimethylsiloxane using X-ray lithography and its surface nanostructuring 聚二甲基硅氧烷微流控通道的x射线光刻制备及其表面纳米化

Journal of Micromanufacturing Pub Date : 2021-05-25 DOI: 10.1177/25165984211015760

P. Mondal, Shweta Saundarkar, N. Khantwal, P. Tiwari, A. Srivastava

{"title":"Fabrication of microfluidic channel of polydimethylsiloxane using X-ray lithography and its surface nanostructuring","authors":"P. Mondal, Shweta Saundarkar, N. Khantwal, P. Tiwari, A. Srivastava","doi":"10.1177/25165984211015760","DOIUrl":"https://doi.org/10.1177/25165984211015760","url":null,"abstract":"The microfluidic devices have attracted considerable attention for their wide range of applications in healthcare, disease diagnosis, and environmental monitoring. We present the fabrication technique, surface wetting, and bonding of a polydimethylsiloxane (PDMS) microfluidic device that will be used as an electroosmotic micromixerfor biomolecules. This technique essentially requires micromold preparation and casting of PDMS. The hardened mold was fabricated on SU-8 using X-ray lithography (XRL) beamline, BL-7, Indus-2 as the synchrotron radiation source at Raja Ramanna Centre for Advanced Technology(RRCAT). The PDMS casting and thermal cross-linking was performed by spin-coating, followed by heating with specific thermocycle. This cross-linked PDMS was bonded with smooth surfaces that were treated with different reactive plasmas using a deep reactive-ion etching (DRIE) system. In a micro fluidic channel, the flow is usually a highly ordered laminar flow and due to lack of turbulence the mixing is very difficult for larger molecules such as peptides, proteins and high-molecular-weight nucleic acids. Here, we propose a microscale mixing device where active mixers are moved by external forces, such as an applied electric field. The dimensions of the fabricated device were generated through computer simulation using the finite-element based COMSOL Multiphysics 5. 4 software. The hydrophobic nature of PDMS hinders the mobility of biomolecules through the microchannel. In this work, plasma-induced surface wettability of PDMS with application of sulfur hexafluoride (SF6) and oxygen (O2) gas recipes was investigated. As a result, the SF6 plasma–treated microchannels became stable hydrophilic and exhibited an increased adhesion or reduced air-bubble trapping during filling with aqueous solutions.","PeriodicalId":129806,"journal":{"name":"Journal of Micromanufacturing","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132004021","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}

引用次数: 2

Simultaneous laser doping and annealing to form lateral p–n junction diode structure on silicon carbide films 在碳化硅薄膜上同时激光掺杂和退火形成横向pn结二极管结构

Journal of Micromanufacturing Pub Date : 2021-05-22 DOI: 10.1177/25165984211016281

Emmanuel Paneerselvam, Sree Harsha Choutapalli, H. Kumar, N. Vasa, D. Nakamura, M. Rao, H. Ikenoue, Tiju Thomas

引用次数: 1

Investigations on the actuation behaviour of friction stir–welded nickel titanium shape memory alloy using continuous fibre laser 连续光纤激光摩擦搅拌焊镍钛形状记忆合金致动性能研究

Journal of Micromanufacturing Pub Date : 2021-05-20 DOI: 10.1177/25165984211015409

S. Prabu, I. Palani

引用次数: 1

Experimental characterization of conformal hydrodynamic nanopolishing of a machined single crystal sapphire cavity 单晶蓝宝石腔体共形水动力纳米抛光的实验表征

Journal of Micromanufacturing Pub Date : 2021-05-14 DOI: 10.1177/25165984211015372

Pradeep Kumar, R. Mittal, R. Singh, S. Joshi

{"title":"Experimental characterization of conformal hydrodynamic nanopolishing of a machined single crystal sapphire cavity","authors":"Pradeep Kumar, R. Mittal, R. Singh, S. Joshi","doi":"10.1177/25165984211015372","DOIUrl":"https://doi.org/10.1177/25165984211015372","url":null,"abstract":"Sapphire is an important ceramic material which finds applications in fields such as temperature sensing, optics, electronics, and ceramic bearings. Polishing of sapphire has always been a difficult task for industries and research communities. Hydrodynamic polishing (HDP) is one of the prominent methods used for polishing of hard and profiled surfaces, whereas rigid tool-based methods such as diamond turning, grinding, and honing have many limitations. The HDP process involves deterministic flow of abrasive particles in the slurry between the workpiece surface and a rotating soft tool to obtain the desired surface finish. A novel experimental setup has been fabricated to realize the conformal hydrodynamic nanopolishing on single crystal sapphire cavity. In this study, the experiments were conducted to understand the effect of abrasive particle size, basicity of slurry, and change in temperature of slurry on the polishing of machined sapphire cavity. The effect of the initial surface roughness of the machined cavity on conformal hydrodynamic nanopolishing has also been investigated. A microcrack/pit-free surface has been found after the final polishing of the sapphire cavity. An improvement of 21% is found in surface finish after the final polishing using abrasive particle size of 0.06 µm. Abrasive slurry with higher basicity (pH 13) does not improve the surface finish. By heating the abrasive slurry to a temperature of 70°C–75°C, surface finish improves by ∼26% as compared to improvement of ∼ 21% at room temperature polishing.","PeriodicalId":129806,"journal":{"name":"Journal of Micromanufacturing","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116137286","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}

引用次数: 0

Nanosecond and sub-nanosecond laser-assisted microscribing of Cu thin films in a salt solution 纳秒和亚纳秒激光辅助盐溶液中Cu薄膜的显微刻划

Journal of Micromanufacturing Pub Date : 2021-04-22 DOI: 10.1177/25165984211008168

Sooraj Shiby, N. Vasa, Matsuo Shigeki

{"title":"Nanosecond and sub-nanosecond laser-assisted microscribing of Cu thin films in a salt solution","authors":"Sooraj Shiby, N. Vasa, Matsuo Shigeki","doi":"10.1177/25165984211008168","DOIUrl":"https://doi.org/10.1177/25165984211008168","url":null,"abstract":"Pulsed laser-based material removal is a preferred technique for microscribing of copper (Cu) film coated on polymers, as the pulse width limits the heat diffusion. However, experimental studies have shown that microscribing of Cu in air results in recast/redeposit formation and oxidation. Although the water medium can reduce these effects to a certain extent, the material removal rate is lesser for Cu. This article reports the influence of laser pulse duration on a hybrid method to enhance the pulsed laser-assisted microscribing of a copper thin film in the presence of an environmentally friendly sodium chloride salt solution (NaCl). The focused laser beam irradiation of Cu film results in ablation with a temperature of the zone well above the boiling point of Cu, which in turn, can assist in accelerating the chemical reaction. In this hybrid scribing technique, along with laser-based material removal, laser-activated chemical etching also helps in removing the material selectively. A sub-nanosecond laser with a pulse width of 500 ps (picosecond [ps] laser) and a nanosecond laser with a pulse width of 6 ns (nanosecond [ns] laser), with a wavelength of 532 nm, are used to understand the influence of laser pulse duration on this hybrid material removal mechanism. Hybrid microscribing with the ps- and ns lasers in salt solution resulted in an increase in the channel depth by ≈5 µm and ≈9 µm, respectively, compared to the channel depth obtained in deionized water. The theoretical model shows that during the ns laser ablation, the cooling rate is slower, resulting in a high temperature in the ablation zone for a longer duration and improved material removal.","PeriodicalId":129806,"journal":{"name":"Journal of Micromanufacturing","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134243020","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}

引用次数: 4

On the improvement of process performance of hard turning using vibration-assisted machining 利用振动辅助加工提高硬车削工艺性能的研究

Journal of Micromanufacturing Pub Date : 2021-04-20 DOI: 10.1177/25165984211008059

Pranesh Dutta, G. Bartarya

{"title":"On the improvement of process performance of hard turning using vibration-assisted machining","authors":"Pranesh Dutta, G. Bartarya","doi":"10.1177/25165984211008059","DOIUrl":"https://doi.org/10.1177/25165984211008059","url":null,"abstract":"In hard turning, the cutting forces are large, which leads to tool wear and tensile nature of residual stresses. Vibration-assisted machining (VAM), where the tool is provided with a low amplitude vibration at significantly high frequency, might improve the process performance of hard turning in terms of cutting forces, residual stress, etc., as VAM helps in reduction of cutting forces and tool wear significantly. To improve the machining operation, a comparative study of VAM with conventional machining is undertaken to study and improve the hard turning performance. A two-dimensional (2D) finite element (FE) model is developed to understand the effect of process parameters better and to study the effect on machining performance by applying one-dimensional ultrasonic vibration to the tool. The model developed is validated with results from a previous work for continuous hard turning conditions. The effect of vibrations induced in cutting velocity direction is studied on the cutting forces and residual stresses induced on the machined workpiece. The ratio of cutting velocity to critical vibrating velocity is an important process parameter that affects the average cutting forces during hard turning using VAM. The nature of cutting force and temperature for a complete cycle of vibration is also studied. The simulation results establish that hard turning using VAM yields lower average cutting forces and more compressive residual stresses in comparison to conventional hard turning.","PeriodicalId":129806,"journal":{"name":"Journal of Micromanufacturing","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126641853","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}

引用次数: 1

An overview of magnetorheological polishing fluid applied in nano-finishing of components 磁流变抛光液在部件纳米加工中的应用综述

Journal of Micromanufacturing Pub Date : 2021-04-20 DOI: 10.1177/25165984211008173

Manjesh Kumar, Hari Narayan Singh Yadav, Abhinav Kumar, M. Das

{"title":"An overview of magnetorheological polishing fluid applied in nano-finishing of components","authors":"Manjesh Kumar, Hari Narayan Singh Yadav, Abhinav Kumar, M. Das","doi":"10.1177/25165984211008173","DOIUrl":"https://doi.org/10.1177/25165984211008173","url":null,"abstract":"Surface quality is the most crucial factor affecting the product lifespan and performance of any component. Most earlier technologies display accuracy in the micrometre or submicrometre range, surface roughness in the nanometre range, and almost no surface defects in the production of optical, mechanical and electronic parts. Such finishing methods incorporate a magnetic field to control the finishing forces using magnetorheological fluid as the polishing medium. Magnetorheological fluid (MR) consists of ferromagnetic and abrasive particles. It is a type of modern intelligent fluid. An optimum selection of magnetorheological fluid constituents and their volume concentration plays an essential role for the ultra-fine finishing of newly developed engineering products. Rheological characteristics of magnetorheological fluid can change rapidly and effortlessly with the support of an activated magnetic field. Traditional finishing methods are comparatively inferior in finishing complex freeform surfaces, due to the lack of controlling finishing forces and limitations of polishing tool movement over the complex freeform contour of the components. There are different types of processes based on the magnetorheological fluid including magnetorheological finishing, magnetorheological abrasive flow finishing, rotational magnetorheological abrasive flow finishing and ball end magnetorheological finishing. This article discusses the development of different types of magnetorheological-fluid-based finishing processes and their modes of operation. The MR fluid devices developed in the last decade are thoroughly reviewed for their working principles, characteristics and applications. This article also highlights the study of rheological characterization of magnetorheological fluid and its applications in different polishing methods appropriate for finishing various complex freeform components.","PeriodicalId":129806,"journal":{"name":"Journal of Micromanufacturing","volume":"411 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121816956","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}

引用次数: 24

A Study of Fiber Laser Micro-Grooving of 316L Stainless Steel at Different Temperatures 不同温度下316L不锈钢光纤激光微刻槽的研究

Journal of Micromanufacturing Pub Date : 2021-01-26 DOI: 10.1177/2516598420984362

A. Sen, B. Doloi, B. Bhattacharyya

{"title":"A Study of Fiber Laser Micro-Grooving of 316L Stainless Steel at Different Temperatures","authors":"A. Sen, B. Doloi, B. Bhattacharyya","doi":"10.1177/2516598420984362","DOIUrl":"https://doi.org/10.1177/2516598420984362","url":null,"abstract":"The present article deals with the generation of micro-grooves on 316L stainless steel (SS) by a nanosecond pulsed fiber laser system. Fabrication of micro-grooves on 316L SS has immensely contributed to the biomedical and automotive industries through improving the mechanical, lubrication, and corrosion resistance properties. In the present work, the considered process parameters are the preheating temperature (100°C and 200°C), along with the room temperature (24°C), cutting speed, sawing angle, pulse frequency, and laser power. The ranges of cutting speed and sawing angle are 0.1–1.1 mm s−1 and 0.1°–1°, respectively. Besides, pulse frequency and laser power vary from 55 kHz to 85 kHz and from 15 W to 45 W, respectively. The constant parameters are the pulse width of 99% and assist air pressure of 6 kgf cm−2. The variable parameters for the analysis are cut width and heat-affected zone (HAZ) width. The article aims to showcase a comprehensive study of fiber laser process parameters at different temperatures (preheated condition and room temperature) with variable sawing angles to produce better process control and bring about each considered process parameter’s critical value. The experimental results show that higher dimensions of cut width and HAZ width are observed at 200°C with the increment of sawing angle and laser power, compared to other temperatures. With the increment of cutting speed and laser power, the HAZ width tends to rise sharply. A significant drop in cut width and HAZ width dimensions is observed with the increment in pulse frequency for any temperature.","PeriodicalId":129806,"journal":{"name":"Journal of Micromanufacturing","volume":"141 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115828383","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}

引用次数: 2