Dissertations / Theses on the topic 'Milling conditions'
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Lau, Ting-Lai. "Optimization of milling conditions." Thesis, University of Manchester, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.240985.
Full textEnparantza, Rafael. "Tool selection and cutting conditions optimisation in milling." Thesis, University of Manchester, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.261551.
Full textMankosa, Michael James. "Investigation of operating conditions in stirred ball milling of coal." Thesis, This resource online, 1986. http://scholar.lib.vt.edu/theses/available/etd-03122009-040831/.
Full textRazfar, Mohammad Reza. "Development of a knowledge based system for the selection of cutting tools and conditions for milling." Thesis, University of Sheffield, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.319419.
Full textKardekar, Abhijit Dilip. "MODELING AND OPTIMIZATION OF MACHINING PERFORMANCE MEASURES IN FACE MILLING OF AUTOMOTIVE ALUMINUM ALLOY A380 UNDER DIFFERENT LUBRICATION/COOLING CONDITIONS FOR SUSTAINABLE MANUFACTURING." UKnowledge, 2005. http://uknowledge.uky.edu/gradschool_theses/373.
Full textTorčík, Václav. "Návrh výroby přední těhlice pro formuli TU Brno Racing." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-231742.
Full textTollrian, Zdeněk. "Technologie opracování středicích nákružků a patek elektromotoru v systému řízení výroby." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2012. http://www.nusl.cz/ntk/nusl-230297.
Full textChakraborty, Pinaki. "Tool Life and Flank Wear Modeling of Physical Vapour Deposited TiAlN/TiN Multilayer Coated Carbide End Mill Inserts when Machining 4340 Steel Under Dry and Semi-Dry Cutting Conditions." Scholarly Repository, 2008. http://scholarlyrepository.miami.edu/oa_dissertations/22.
Full textGassara, Bassem. "Conditions de coupe en fraisage à grande vitesse : effet de la variation de la vitesse d’avance." Phd thesis, Toulouse, INPT, 2013. http://oatao.univ-toulouse.fr/10977/1/gassara.pdf.
Full textAthukorala, Asitha Chandimal. "Investigation of wear and ratcheting response of head-hardened Australian rail steel under conditions of rolling contact fatigue." Thesis, Queensland University of Technology, 2016. https://eprints.qut.edu.au/95626/9/Asitha_Athukorala_Thesis.pdf.
Full textNovák, Lukáš. "Návrh technologie výroby zadané součásti pro podmínky školní dílny ÚST FSI VUT v Brně." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-230986.
Full textBaklík, Lukáš. "Volba a optimalizace řezných podmínek pro progresivní výrobní technologie." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2016. http://www.nusl.cz/ntk/nusl-241690.
Full textLišková, Tereza. "Technologie obrábění vybrané součásti sestavy vakuové vývěvy." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2020. http://www.nusl.cz/ntk/nusl-417104.
Full textEliasson, Fredrik, and Ilija Todorovic. "Deformationsanalys av klämvillkor av en vevaxel." Thesis, Högskolan i Skövde, Institutionen för ingenjörsvetenskap, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-14218.
Full textCrankshaft deformation is studied in connection with clamping conditions in a whirl milling machine before a cutting process. The purpose of the project is to increase knowledge about the deformation behaviour of the crankshaft and its important functional surfaces by performing analyses using the finite element method (FEM). Volvo Cars in Skövde, Sweden is currently managing unwanted crankshaft deformation occurrence by using time consuming physical testing methods. Therefore, the company wish to use virtual analyses instead of physical tests. This work also leads to a determination if FEM is an applicable tool in order to maintain narrow tolerances of the crankshaft. Using virtual analyses instead of physical tests would be time saving and would also have a positive impact on the environment. The computer software Abaqus is used to implement the deformation analyses that are also evaluated against physical measurements done with a tensile testing machine (Instron) and thereby be able to ensure the reliability of the used FE model. FE analyses are mainly performed to evaluate the deformation of the crankshaft associated with clamping. Two different crankshaft types are being analysed. A FE model is created for each crankshaft along with applied boundary and load conditions according to performed mechanical analysis of the crankshaft. Obtained results show that the thrust bearing sides of the crank pins on the crankshaft deform in the range of
Fu, Pan. "An intelligent cutting tool condition monitoring system for milling operation." Thesis, Southampton Solent University, 2000. http://ssudl.solent.ac.uk/1237/.
Full textAjilo, Deborah (Deborah M. ). "eyeDNA : Tool Condition Monitoring for a desktop CNC milling machine." Thesis, Massachusetts Institute of Technology, 2018. http://hdl.handle.net/1721.1/115670.
Full textCataloged from PDF version of thesis.
Includes bibliographical references (pages 81-84).
Tool wear is a major obstacle to realizing full automation in metal cutting operations. In this thesis, we designed and implemented a low cost Tool Condition Monitoring (TCM) system using off-the-shelf sensors and data acquisition methods . Peripheral end milling tests were done on a low carbon steel workpiece and the spindle vibration, cutting zone temperature and spindle motor current were recorded. Features from these data sources were used to train decision tree models in MATLAB with the aim of classifying the stages of tool wear. Results showed that the feature sets fusing information from all data sources performed the best, classifying the tool wear stage with up to 93% average accuracy.
by Deborah Ajilo.
S.M.
Cooper, Clayton Alan. "Milling Tool Condition Monitoring Using Acoustic Signals and Machine Learning." Case Western Reserve University School of Graduate Studies / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=case1575539872711423.
Full textKachyňa, Stanislav. "Návrh výrobní technologie součásti obráběcího stroje." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2010. http://www.nusl.cz/ntk/nusl-229221.
Full textDominguez, Caballero Javier Alejandro. "Live tool condition monitoring of SiAlON inserted tools whilst milling nickel-based super alloys." Thesis, University of Sheffield, 2017. http://etheses.whiterose.ac.uk/20763/.
Full textŠalanda, Jiří. "Návrh zefektivnění přípravy výroby u vybrané technologie." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2008. http://www.nusl.cz/ntk/nusl-228170.
Full textLogins, Andris. "High speed milling technological regimes, process condition and technological equipment condition influence on surface quality parameters of difficult to cut materials." Doctoral thesis, Universitat Politècnica de València, 2021. http://hdl.handle.net/10251/164122.
Full text[CA] La qualitat superficial en les peces mecanitzades depèn de l'acabat superficial, resultat de les marques deixades per l'eina durant el procés de tall. Les aproximacions teòriques tradicionals indiquen que aquestes marques estan relacionades amb els paràmetres de tall (velocitat de tall, avanç, profunditat de tall...), el tipus de màquina, el material de la peça, la geometria de l'eina, etc. Però no tots els tipus de mecanitzat i selecció de materials poden donar un resultat ambigu. Avui en dia, de manera progressiva, s'estan utilitzant les tècniques de fresat d'Alta Velocitat sobre materials de difícil mecanització cada vegada més. El fresat d'Alta Velocitat implica un considerable nombre de paràmetres del procés que poden afectar la formació topogràfica 3D de la superfície. La hipòtesi que els paràmetres de rugositat superficial depenen de les empremtes deixades per l'eina, determinades per les condicions de treball i les propietats de l'entorn, va conduir al desenvolupament d'una metodologia d'investigació personalitzada. Aquest treball de recerca mostra com la combinació dels paràmetres, inclinació de l'eix de l'eina, deflexió geomètrica de l'eina i comportament vibracional de l'entorn, influencien sobre el paràmetre de rugositat superficial 3D, Sz. El model general va ser dividit en diverses parts, on s'ha descrit la influència de paràmetres addicionals del procés, sent inclosos en el model general proposat. El procés incremental seguit permet a l'autor desenvolupar un model matemàtic general, pas a pas, testejant i afegint els components que més afecten a la formació de la topografia de la superfície. En la primera part de la investigació es va seleccionar un procés de fresat amb eines de punta plana. Primer, s'analitza la geometria de l'eina, combinada amb múltiples avanços, per distingir els principals paràmetres que afecten la rugositat superficial. S'introdueix un model de predicció amb un component bàsic per a l'altura de la rugositat, obtinguda a través de la geometria de l'eina de tall. A continuació, es duen a terme experiments més específicament dissenyats, variant paràmetres tecnològics. Això comença amb l'anàlisi de la inclinació de l'eix de l'eina contra la taula de fresat. Els espècimens d'anàlisi són mostres amb quatre recorreguts de tall rectes amb tall en sentit contrari. Les trajectòries lineals amb diferents direccions donen l'oportunitat d'analitzar la inclinació del fus de fresat en la màquina. Una anàlisi visual revelà diferències entre direccions de tall oposades, així com marques deixades pel tall posterior de l'eina. Considerant les desviacions de les marques de tall observades en les imatges de rugositat superficial obtingudes a partir de les mesures, es va introduir una anàlisi sobre el comportament dinàmic de l'equip i de l'eina de tall. Les vibracions produeixen desviacions en la taula de fresat i en l'eina de tall. Aquestes desviacions van ser detectades i incloses en el model matemàtic per completar la precisió en la predicció de el model. Finalment, el model de predicció de el paràmetre de rugositat Sz va ser comprovat amb un major nombre de paràmetres del procés. Els valors de Sz mesurats i predits, van ser comparats i analitzats estadísticament. Els resultats van revelar una major desviació de la rugositat predita en les mostres fabricades amb diferents màquines i amb diferents avanços. Importants conclusions sobre la precisió de l'equip de fabricació han estat extretes i d'elles es desprèn que l'empremta de l'eina de tall està directament relacionada amb els paràmetres de la topografia de la superfície. A més, la influència de la empremta està afectada per la geometria de l'eina de tall, la rigidesa de l'eina i la precisió de l'equip. La geometria de l'eina conforma la base del paràmetre Sz, desviació de l'altura de la superfície. Les conclusions assolides són la base per recomanacions pràctiques, aplicables en la indústria.
[EN] Surface quality of machined parts highly depends on the surface texture that reflects the marks, left by the tool during the cutting process. The traditional theoretical approaches indicate that these marks are related to the cutting parameters (cutting speed, feed, depths of cut...), the machining type, the part material, the tool geometry, etc. But, different machining type and material selection can give a variable result. In nowadays, more progressively, High Speed milling techniques have been applied on hard-to-cut materials more and more extensively. High-speed milling involves a considerable number of process parameters that may affect the 3D surface topography formation. The hypothesis that surface topography parameters depends on the traces left by the tool, determined by working conditions and environmental properties, led to the development of a custom research methodology. This research work shows how the parameters combination, tool axis inclination, tool geometric deflection, cutting tool geometry and environment vibrational behavior, influence on 3D surface topography parameter Sz. The general model was divided in multiple parts, where additional process parameters influence has been described and included in general model proposed. The incremental process followed allows the author to develop a general mathematical model, step by step, testing and adding the components that affect surface topography formation the most. In the first part of the research a milling procedure with flat end milling tools was selected. First, tool geometry, combined with multiple cutting feed rates, is analyzed to distinguish the main parameters that affect surface topography. A prediction model is introduced with a basic topography height component, performed by cutting tool geometry. Next, specifically designed experiments were conducted, varying technological parameters. That starts with cutting tool axis inclination against the milling table analysis. The specimens of analysis are samples with 4 contrary aimed straight cutting paths. Linear paths in different directions give a chance to analyze milling machine spindle axis topography, as well as marks left from cutting tool back cutting edge. Considering the deviations of cutting marks observed in the images of the surface topography obtained through the measurements, the milling equipment and cutting tool dynamical behavior analysis were introduced. Vibrations produce deviations in the milling table and cutting tool. These deviations were detected and included in the mathematical model to complete the prediction model accuracy. Finally, the prediction model of the topography parameter SZ was tested with increased number of process parameters. Measured and predicted SZ values were compared and analyzed statistically. Results revealed high predicted topography deviation on samples manufactured with different machines and with different feed rates. Relevant conclusions about the manufacturing equipment accuracy have been drawn and they state that cutting tool's footprint is directly related with surface topography parameters. Besides, footprint influence is affected by cutting tool geometry, tool stiffness and equipment accuracy.
Logins, A. (2021). High speed milling technological regimes, process condition and technological equipment condition influence on surface quality parameters of difficult to cut materials [Tesis doctoral]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/164122
TESIS
Mingardi, Giacomo. "Digitalization of a milling machine: development of a condition monitoring application and human-machine interface." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021.
Find full textWilmot, Wessley. "Process and machine improvements and process condition monitoring for a deep-hole internal milling machine." Thesis, University of Manchester, 2017. https://www.research.manchester.ac.uk/portal/en/theses/process-and-machine-improvements-and-process-condition-monitoring-for-a-deephole-internal-milling-machine(2bb87f60-aa39-4fff-a82a-9360ce36b74c).html.
Full textRepo, Jari. "Condition monitoring of machine tools and machining processes using internal sensor signals." Licentiate thesis, KTH, Machine and Process Technology, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-12872.
Full textCondition monitoring of critical machine tool components and machining processes is a key factor to increase the availability of the machine tool and achieving a more robust machining process. Failures in the machining process and machine tool components may also have negative effects on the final produced part. Instabilities in machining processes also shortens the life time of the cutting edges and machine tool.
The condition monitoring system may utilise information from several sources to facilitate the detection of instabilities in the machining process. To avoid additional complexity to the machining system the use of internal sensors is considered. The focus in this thesis has been to investigate if information related to the machining process can be extracted directly from the internal sensors of the machine tool.
The main contibutions of this work is a further understanding of the direct response from both linear and angular position encoders due the variations in the machining process. The analysis of the response from unbalance testing of turn tables and two types of milling processes, i.e. disc-milling and slot-milling, is presented. It is shown that operational frequencies, such as cutter frequency and tooth-passing frequency, can be extracted from both active and inactive machine axes, but the response from an active machine axis involves a more complex analysis. Various methods for the analysis of the responses in time domain, frequency domain and phase space are presented.
QC 20100518
Wilcox, Steven John. "Cutting tool condition monitoring using multiple sensors and artificialintelligence techniques on a computer numerical controlled milling machine." Thesis, Heriot-Watt University, 1992. http://hdl.handle.net/10399/1446.
Full textBinsaeid, Sultan Hassan. "Multisensor Fusion for Intelligent Tool Condition Monitoring (TCM) in End Milling Through Pattern Classification and Multiclass Machine Learning." Scholarly Repository, 2007. http://scholarlyrepository.miami.edu/oa_dissertations/7.
Full textKeshavarz, Mona. "A Conditional Cash Transfer Program in Brazil : How Bolsa Família Came to Affect Millions of Children." Thesis, Stockholms universitet, Institutionen för spanska, portugisiska och latinamerikastudier, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-87723.
Full textEcker, Michaela Sarah. "Two million years of environmental change : a case study from Wonderwerk Cave, Northern Cape, South Africa." Thesis, University of Oxford, 2015. https://ora.ox.ac.uk/objects/uuid:f458923a-5b59-4d0a-91f4-83111b4e28dc.
Full textMausser, Marcel D. [Verfasser], and Klaus von [Akademischer Betreuer] Klitzing. "Scanning single-electron transistor array microscope to probe a two-dimensional electron system under quantum Hall conditions below 40 milli-Kelvin / Marcel D. Mausser ; Betreuer: Klaus von Klitzing." Stuttgart : Universitätsbibliothek der Universität Stuttgart, 2017. http://d-nb.info/112981615X/34.
Full textKarami, Peyman. "Robust and Durable Vacuum Insulation Technology for Buildings." Doctoral thesis, KTH, Byggnadsteknik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-176494.
Full textDagens byggnader ansvarar för omkring 40% av världens energianvändning och står också för en väsentlig del av utsläppen av växthusgaser. I Sverige kan ca 21 % av energianvändningen relateras till förluster genom klimatskalet. Miljonprogrammet är ett namn för omkring en miljon bostäder som byggdes mellan 1965 och 1974, och många av dessa byggnader har en dålig energiprestanda efter dagens mått. Huvudsyftet med denna studie har varit att utforska möjligheterna att använda vakuumisoleringspaneler (VIP:ar) i byggnader med viss fokus på tillämpning i Miljonprogrammets byggnader. Med en värmeledningsförmåga som är ca 8 - 10 gånger bättre än för traditionell isolering erbjuder VIP:arna unika möjligheter till förbättrad termisk prestanda med minimal isolerings tjocklek. Denna avhandling hade tre huvudsyften. Det första var att undersöka nya alternativ för kärnmaterial som bland annat kan reducera kostnaden vid produktion av VIP:ar. Tre nyutvecklade nanoporösa kiselpulver har testats med olika stationära och transienta metoder. En inom projektet utvecklad testbädd som kan anslutas till TPS instrument (Transient Plane Source sensor), har använts för att mäta värmeledningsförmågan hos kärnmaterial för VIP:ar, vid varierande gastryck och olika mekaniska laster. Slutsatsen blev att transienta metoder är mindre lämpliga för utföra mätningar av värmeledningsförmåga för nanoporösa kiselpulver låg densitet. Avvikelsen i resultaten är dock minimal för densiteter ovan en gräns då värmeledningen genom fasta material blir dominerande jämfört med värmeöverföring genom strålning. Det andra syftet har varit att föreslå ett nytt monteringssystem för VIP:ar som kan användas för att förbättra energieffektiviteten i byggnader som är typiska för Miljonprogrammet. Genom parametrisk analys och dynamiska simuleringar har vi kommit fram till ett förslag på ett nytt monteringssystem för VIP:ar som har utvärderats genom fullskaleförsök i klimatkammare. Resultaten från fullskaleförsöken visar att den nya tekniska lösningen förbättrar väggens U-värde med upp till 56 %. En förbättrad värmegenomgångskoefficienten för väggen i mitten av en VIP blev mellan 0.118 till 0,132 W m-2K-1 och värmeledningstalet centre-av-panel 7 mW m-1K-1 uppnåddes. Detta arbete innehåller dessutom en ny metod för att mäta köldbryggor i anslutningar med hjälp av infraröd termografi. En effektiv värmeledningsförmåga för 10.9 mW m-1K-1 uppnåddes. Resultaten tyder även på att den verkliga termiska prestandan av VIP:ar i konstruktioner är något sämre än mätvärden för paneler i laboratorium. En effektiv värmeledningsförmåga av 10.9 mW m-1K-1 ger dock väggkonstruktionen en utmärkt termisk prestanda. Det tredje syftet har varit att bedöma miljöpåverkan av en VIP-isolerad byggnad, från produktion till drift, eftersom en livscykelanalys av hela byggnader som är isolerade med vakuumisoleringspaneler inte har gjorts tidigare. Slutsatsen var att VIP:ar har en större miljöpåverkan än traditionell isolering, i alla kategorier förutom ozonnedbrytande potential. VIP:ar har en mätbar påverkan på de totala utsläppen av växthusgaser och primärenergianvändningen i byggnader när både produktion och drift beaktas. Miljöpåverkan av de använda VIP:arna är dock positiv jämfört med GWP av en standardbyggnad (en minskning med 6 %) medan primärenergianvändningen ökade med 20 %. Slutsatsen var att ytterligare användning av VIP:ar gynnas av reducerad energiförbrukning och alternativa energikällor i produktionen av nanoporösa kiselpulver medan användningen av alternativa kärnmaterial och återvinning av VIP kärnor kan hjälpa till att minska miljöpåverkan. En känslighetsanalys visade att valet av VIP:ar har en betydande inverkan på miljöpåverkan, vilket ger möjlighet att reducera den totala användningen av primärenergi i en byggnad med 12 % och utsläppen av växthusgaser kan vara minska, så mycket som 11 % när det gäller både produktion och drift under 50 år. Avslutningsvis är det möjligt att dra slutsatsen att VIP:ar är ett mycket konkurrenskraftigt alternativ för att isolera byggnader som är typiska för Miljonprogrammet. Dock krävs ytterligare undersökningar för att minimera de mätbara miljöeffekter som förvärvats i denna LCA-studie för VIP-isolerade byggnader.
QC 20151109
Simulations of heat and moisture conditions in a retrofit wall construction with Vacuum Insulation Panels
Textural and thermal conductivity properties of a low density mesoporous silica material
A study of the thermal conductivity of granular silica materials for VIPs at different levels of gaseous pressure and external loads
Evaluation of the thermal conductivity of a new nanoporous silica material for VIPs – trends of thermal conductivity versus density
A comparative study of the environmental impact of Swedish residential buildings with vacuum insulation panels
ETICS with VIPs for improving buildings from the Swedish million unit program “Miljonprogrammet”
游登吉. "Monitoring milling tool conditions by processing zoom arma modeling." Thesis, 1990. http://ndltd.ncl.edu.tw/handle/43878577490317018573.
Full textKuo, Ming-Hsiu, and 郭銘修. "The Effect of Milling Conditions and Tool Geometry on Cutting Coefficients." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/70931418894676608387.
Full text國立成功大學
機械工程學系碩博士班
94
This thesis investigates the effect of milling conditions and tool geometry on cutting coefficients. The cutting coefficients are identified by using the Least Square method with the milling force in time domain. The Least Square method has smaller errors than mean force method and harmonic force method to identify the cutting coefficients. The experiment investigates cutting coefficients by choosing different materials (Al 6061-T6, SUS 304 and Inconel 718), milling configuration (up milling, down milling), conditions (different radial of depth), and tool Geometry (rake angle, clearance angle, helix angle). The results of experiments on Al6061 show that the diversity of down milling and up milling can be ignored for the same mean chip thickness. In milling SUS 304 by different tool factors, the results show that a large helix angle, results is smaller specific coefficients; the bigger rake angle, the smaller specific coefficients. The clearance angle has less effect on specific coefficient. In different cutting speed experiments, on using Al 6061 and SUS 304, the results of experiment show specific coefficients decrease with increase cutting speed, on the contrast, the specific coefficients of Inconel 718 increase with cutting speed.
Fan, Gang-Xiang, and 范綱翔. "Investigation of Tool Paths and Cutting Conditions for Angle-Milling Process." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/777b82.
Full text逢甲大學
機械與電腦輔助工程學系
106
The main purpose of this thesis is to investigate the influence of machining parameters and milling path on the machining accuracy in the deep groove end-milling for the offset angle of the cylindrical material (SNCM220). The machine used in this study is a turning-milling machine. The milling path includes contour milling (positive and negative milling) and linear reciprocating milling. The machining parameters include spindle speed, feedrate, and feed per edge. In this experiment, Taguchi method was used to conduct experimental analysis to find out the key parameters, and then get the best combination of parameters. Through the experimental analysis, the optimal parameter combination is: milling path = contour positive milling, spindle speed = 2400rpm, feedrate = 300m/min, feed rate per blade = 0.629mm. This study confirms that this combination of parameters can effectively improve the deep groove machining accuracy of the offset angle, and thereby meet the experimental design goals.
Zeng, Guan-Wei, and 曾冠瑋. "Investigation of Tool Path Method and Cutting Conditions for Counterbore End Milling Proceess." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/685x7a.
Full text國立臺北科技大學
製造科技研究所
102
In this paper, an investigation of counterbore milling conditions by using end mill cutters was performed. Using the measured milling forces and the machined counterbore quality (diameter accuracy and its roundness) to predict the ideal milling conditions for counterbore machining. A variety of milling conditions including the used end mill diameter, the interval of step type feeding method, the helical angle or pitch of helical type feeding method and the feed per tooth were planned. In contrast to the step type method, the experimental results show that the helical type feeding method can stabilize the cutting forces and reduce the lateral cutting force during milling process and improve the machined counterbore accuracy. As well as the appropriate end mill diameter of counterbore milling is between about 70% to 80% of the counterbore hole diameter.
Wang, Zhi-Kuan, and 王智寬. "Investigation of Cutting Performance for NAK80 Die Steel under Different Assisted Milling Conditions." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/97xty4.
Full text國立虎尾科技大學
機械與電腦輔助工程系碩士班
105
NAK80 mold steel is a high-performance, high-precision, and advanced plastic mold steel with mirror surface and hence is a specific material commonly used for plastic die manufacturing currently. The machined surface may exhibit fine pattern and artistic appearance in electrical discharge machining, and is also featured by good mirror surface quality in grinding. Recently, the demand of surface quality for mold steel is getting more stringent, but the machined surface after milling operation is usually rougher. Therefore, most manufacturers solved these problems by grinding followed by polishing subsequently. However, the time wasted and cost for grinding and polishing procedures are considerable. If the surface quality machined by milling only may be promoted to a certain degree through different assisted ways, the time and cost for these machining operations can thus be reduced. As a result, the same standard of surface quality may be attained in replacement of grinding operation eventually and the grinding procedure may be omitted directly. It is expected that some machining processes for surface quality enhancement can be omitted based on the advantages of different assisted ways, which can serve as a reference for mold manufacturing to save the time wasted in some intermediate machining procedures, and enhance the production efficiency. In this study, five different assisted ways, including without assistance, laser assisted, cutting fluid assisted, MQL assisted and cold air assisted were employed for NAK80 mold steel milling. The assisted effect on cutting performance could be verified and the difference, merit and drawback among them may be compared. Milling experiments without assistance were conducted, followed by laser assisted, cutting fluid assisted, MQL assisted and cold air assisted milling experiments subsequently. The 18 set experiments were performed in each assisted way but 27 sets were executed in the first situation. Under each assisted milling circumstance, the effects of process parameters on the variations of surface roughness, cutting force, tool wear and surface morphology of workpiece are thus investigated. It is expected that the cutting performance of the NAK80 mold steel could be promoted through these assisted ways. Before the use of laser assistance, the laser preheating time related to the workpiece surface should be tested in advance for a proper spacing distance setting between laser-spot and cutting-tool. In this study, milling experiments of NAK80 mold steel by cutting-tool of extra-fine particle tungsten carbide with TiSiN coating were conducted. And the experiments of process parameter combinations such as spindle speed, feed rate and radial depth of cut were also planned. During the experiments, dynamometer is used to monitor the variation of cutting forces. Flank wear of cutting-tool and machined surface morphology of the NAK80 mold steel were measured by tool-microscope off-line. Surface roughness measurement through a probe contact type instrument is also performed. The results show that, under the same milling conditions, the surface roughness and cutting force are decreased as the spindle speed is increased, but both of them is increased as the feed rate and radial cutting depth are increased. In addition, the maximum flank wear of cutting-tool is increased as the spindle speed, feed rate and radial cutting depth are increased. In terms of cutting assisted, the cutting performance exhibited in the cold air assisted milling prevails over that in milling without assistance as well as with the other each assisted way. As a result, the cutting-tool flank wear, surface roughness and cutting force are all better than the other assisted ways. The better result obtained in this study was achieved by using the cold air assisted in NAK80 mold steel milling under the conditions of the spindle speed of 15000 rpm, feed rate of 300mm/min and radial cutting depth of 0.1 mm. The cutting force of 40.31N and surface roughness could be reduced to 0.216μm accompanied by these process parameter combinations.
Wang, Tin-huang, and 汪錫煌. "Investigation of ideal milling conditions ofSUS304 Satinless Steel Considering the SurfaceRoughness and Chip Grometry." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/60684033754765963947.
Full text中興大學
機械工程學系所
95
selected tools were calculated using F.W. Taylor’s tool life equation. We hypothesized that by manipulating these independent variables, the surface roughness, the chip shape, and the relationship between the cutting conditions and cutting resistances would vary. The results of this study indicated that with high cutting speed and low feed rate, the chips were long and thin with no spiral shape, and are accompanying with small chips. The surface roughness was good. With an increase in feed rate without changing cutting speed, the shape of the chips became spiral with hook-shape slices. The surface roughness was not good. The change in surface roughness associated with the change in feed depth was far less than the change associated with feed rate. With the same feed rate and feed depth, the cutting resistance increased proportionally to the increase in cutting speed.
Wu, Zhi Fu, and 吳志富. "A study on the surface quality and cutting conditions in end milling of aluminum alloy." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/66869740076363608346.
Full textChen, Zhi-Yu, and 陳治宇. "A Study on Cutting Performance under Different Cooling/Lubrication Conditions for Glass-Substrate High-Speed Milling." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/72c632.
Full text國立虎尾科技大學
機械與電腦輔助工程系碩士班
101
In the recent year, the glass substrate has become gradually the most important material of the development in the information technology enterprise, its demanding quantity is increasing higher and higher, the quality of various processing have been requested more severer. For the time being, the enterprise of glass processing is mainly on cutting and edge seaming, the process flow is complicated and the cost is higher, therefore , the important topics of the current processing technology are seeking for the breakthrough of short process and the efficient cost saving . Because the glass possesses the quality of high intensity, high stiffness and low thermal conductivity, it is easy to make the cutting tool have the fast abrasion in the processing period and have imperfections like cracks and edge/corner collapse on the processing surface. To improve the above problems, the high rotation speed and low cutting depth and cooling fluild are employed in this study, also collocates the suitable feed rate and proceed the side milling/cutting, control the tough and brittle milling/cutting transformation model hopefully, thus, improve the processing efficiency of the glass substrate. The study employs large and medium water- soluble cutting fluid and green Production technique MQL and uses the diamond Tungsten Carbide (WC) cutting tool to proceed the milling/cutting experiment of the glass substrate. During the milling/cutting experiment, dynamometer and spectrum analyzer are employed to monitor the cutting force and vibration quantity, respectively. Also, observing the quality of edge surface of glass and the abrasion of cutting tool under different experiment parameters by tool-microscope off-line. The experimental data are analyzed under numerical analysis. Results show that the comparison between the traditional medium quantity of pouring wet milling/cutting and MQL, large quantity of pouring wet milling/cutting provide a good quenching effect on processing zone, thus, reduce the abrasion of the cutting tool and contribute to lower the cutting force. Observing from the cutting dynamic vibration quantity reveals that adding the water- soluble cutting fluid will contribute to improve and lower the cutting vibration and provide the stable action of cutting. Another observing from the damage of the raw material edge reveals that the better surface quality of the glass edge is obtained under high cutting speed, low feed rate and shallow path cutting. Adding the water- soluble cutting fluid can lower effectively the large amount of heat which is generated in the processing period of the glass surface. The high temperature difference between the surface and the inner layer of the glass is avoided, thus, the internal stress of the glass increases and over the limited intensity of the glass itself, then, leads to the break of the glass. Observing from the abrasion quantity of the cutting tool reveals that adding the water- soluble cutting fluid in the milling/cutting period, when increasing the cutting depth, the apparent dent damage will appear on the abdomen part of the cutting tool as the feed rate is increasing. Applying the MQL processing will make the cutting tool collapse the edge and shell off on its front end. Making a comprehensive survey of all the performance of milling/cutting, raising the cutting speed, lowering both of the cutting depth and the feed rate will reduce the occurrence of damage of glass substrate edge effectively, upgrade the cutting tool life and obtain the better quality of edge surface.
Chen, Sian-Ming, and 陳賢銘. "Effects of rice mutant lines and milling conditions on the functional components and physicochemical properties of rice bran." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/19990173551186339621.
Full text輔仁大學
食品科學系
98
Rice bran is the byproduct of rice milling. It is rich in lipid, protein, fiber, and functional components. Obtaining the rice bran with high amount of functional components could be achieved by screening from the rice variety. Moreover, the functional property of rice bran is poor, resulting in the limitation of its application. With proper milling and sieving process, the hull and broken rice in the bran could be separated, and a bran fraction with special functional property could be screened. Therefore, the objectives of this research were to investigate and compare the content of functional components in different rice mutant bran, and to study the effects of milling cycle and sieving on the physicochemical properties of rice mutant bran. The results showed that the order of rice mutants in two crop years (2007II and 2008I) based on their functional component contents were the same except α-tocopherol. This result indicated that the rice mutants used in this study were well cultivated. Moreover, the alpha type tocopherol and the gamma type tocotrienol represented highest proportion in the rice mutant brans. According to the literature, α-tocotrienol had the best antioxidant activity among the tocotrienol derivatives. Thus, the rice mutants, SA402 and SA419 with the highest and the lowest content of α-tocotrienol were screened and used for analyzing the physicochemical property of rice bran treated with different milling and sieving process. SA402 rice bran obtained from the second milling cycle had higher ash, lipid, and protein contents than the bran obtained from the first milling cycle, but SA419 rice bran had the opposite results. The water-holding and oil-holding capacities of the rice bran decreased with particle size. The results also showed that the lower the total starch in rice bran, the higher the insoluble dietary fiber, and the better the water-holding and oil-holding capacities. In conclusion, rice bran with high amount of functional components and special functional property could be prepared by the combined selection of rice variety, milling and sieving.
Huang, Yen-Wei, and 黃彥為. "The study of stabilization of heavy metals from high energy ball milling of MSWI fly ash in high temperature conditions." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/34786537505574307816.
Full text淡江大學
水資源及環境工程學系碩士班
96
Since municipal solid waste incinerator (MSWI) fly ash contains a lot of heavy metals, which exceed the regulatory limits of hazardous waste usually, and the disposal of fly ash has presented a significant problem. Consequently, the stabilizing and recovering of MSWI fly ash is the majority trend, and sintering is a potentially technology in the future. In the study, the characteristics of heavy metals volatilities of MSWI fly ash handled by water-extraction and then high energy ball milling with different stabilizers were investigated. The particle size analyzer, X-ray diffraction (XRD) and scanning electron microscope (SEM) were used to exam the properties after milling. The hydrofluoric acid digestion was applied to evaluate the heavy metals volatilities of the ashes. The results showed that, the addition of 30% Al2O3 with 0.8 M phosphoric acid ball milling, the volatility of Zn and Pb could be controlled within 20-30% in the sintering temperature of 800 and 1,000 oC, which can also control the volatility in 41% and 22%at 1200 oC relatively. The compression strength of regenerated aggregate was increased with the elevation of temperature gradually, reached 344 kg/cm2 at 1,200 oC, which reached the criteria of constructional aggregate. Key words: MSWI fly ash, high energy ball milling, heavy metals, stabilization, sintering, regenerated aggregate.
"Big business financing in modern China: a case study of the flour milling and cotton textile enterprises of the Rong Brothers, 1901-1936." Chinese University of Hong Kong, 1992. http://library.cuhk.edu.hk/record=b5887029.
Full textThesis (M.Phil.)--Chinese University of Hong Kong, 1992.
Includes bibliographical references.
Chapter 1. --- Introduction: Big Business Financing in Modern China --- p.1
Chapter 2. --- The Demand for Capital and Credit --- p.18
Chapter 3. --- Internal Financing --- p.30
Chapter 3.1. --- Shareholders' Initial Investment
Chapter 3.2. --- Accumulated Capital
Chapter 4. --- External Financing --- p.56
Chapter 4.1. --- Economic Background and Rationale behind External Financing
Chapter 4.2. --- Loans and Credits from Qianzhuang
Chapter 4.3. --- Loans from Modern Chinese Banks
Chapter 4.4. --- Loans from the Foreign Banks in China
Chapter 4.5. --- Credits in Machinery Buying
Chapter 5. --- Attempts of Closed Financing --- p.110
Chapter 5.1. --- Guangsheng Qianzhuang: The First Attempt
Chapter 5.2. --- Gechang Wanglai: A Channel of Closed Financing
Chapter 5.3. --- The Headquarters Company: An Institutional Device
Chapter 5.4. --- Staff's Savings Department: One Step Further
Chapter 6. --- "Conclusion: Entrepreneurship, Social Networking, and Economic Rationalization" --- p.136
Chapter 6.1. --- Entrepreneurship
Chapter 6.2. --- Social Networking
Chapter 6.3. --- Economic Rationalization
Appendix --- p.148
Glossary --- p.150
Selected Bibliography --- p.157
Richter, Frank. "On-line tool condition monitoring in milling." 1988. http://catalog.hathitrust.org/api/volumes/oclc/19712595.html.
Full textTypescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 149-156).
Hsu, Pau-Lo. "On-line monitoring of milling cutting tool condition." 1987. http://catalog.hathitrust.org/api/volumes/oclc/18429633.html.
Full textTypescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 201-208).
LIN, JUN-YUAN, and 林俊源. "The prediction of face milling forces in tool-wear condition." Thesis, 1990. http://ndltd.ncl.edu.tw/handle/35775061762831606251.
Full textLiang, Chen-Yu, and 梁宸瑜. "Applications of SOM Neural Network for Tool Condition Monitoring in the Milling of Inconel 718." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/91758104342324017514.
Full text國立中興大學
機械工程學系所
105
A number of studies have been reported for the development of tool wear monitoring system based on the vibration and acoustic emission signal. However, few study focus on the machining of nickel based material. In addition, due to the variation of the collected signals with the change of cutting parameters, tool geometry, the clamper force, and the other system variation, it is not easy to directly transfer the developed system to industry in past decades. To study the relationship between tool wear and collected spindle vibration and vise AE signals, analyze the effect of system variation on the collected signals, and develop the robust tool wear monitoring system, an experiment has been implemented to collected signals during cutting process. The effect of the number of tool tooth and the clamping force on collected signals was studied as well. To improve the robustness of developed system, an SOM filter is designed for feature extraction to remove the unreliable features for monitoring system. In experimental setup, two accelerometers were installed on an adaptor attached to the spindle in X and Z direction, respectively, along with an AE signals installed on the vise. Three kinds of cutting tool with various numbers of teeth were implemented in experiments. Three setup of clamping forces with 50 NM, 60Nm, and 100Nm were also implanted to study their effect on collected signals. The results show that the change of the number of tooth in cutting tool will not affect the energy distribution over frequency for both spindle vibration signals. For AE signal, the energy of AE signal increase dramatically when the number of tooth increase from two to three. With the change of clamping force, the change of the energy distribution over the frequency for X direction vibration signal can be observed. However, the same phenomenon will not be observed for Z direction vibration signal. Moreover, the increase of clamping force will increase the level of the AE signal on vise. For the evaluation of developed system, the 93% and 90% classification rate can be reached, respectively, with Z and X direction spindle vibration signals without adopting SOM filter. The classification rate can be improved to 95.2% and 94.5%, respectively, with the application of designed SOM filter. For the AE-signal based monitoring system, only 65% of classification rate can be obtained, and no improvement can be observed when applying the SOM filter to the system.
Wang, Chung-Ying, and 王崇穎. "The Development of Tool Condition Monitoring in the Milling of Inconel 718 by Recurrent HMMs." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/738fdq.
Full text國立中興大學
機械工程學系所
106
The Inconel-718 is the key material for the aero industry, but the serious tool wear always make it a challenge to improve the quality and machining efficiency. The tool condition monitoring provides a solution to optimize the tool exchange time and machining efficiency. However, the uncertainty of system and material variation make the system not easy to implement the developed system in the laboratory to the industrial site. Therefore, how to improve the robustness of the system plays an important role to implement the tool wear monitoring system in the production line. In this research, a modified Recurrent Hidden Markov Model (RHMMs) is proposed to improve the robustness of the monitoring system. In the system development and evaluation, the variation of system is designed by changing the clamping force on the vise and the diameter of cutting tool. Finally, multi-sensor feature and decision fusion was adopted to improve the overall performance of the monitoring system. In experiments, the vibration signals in the X and Y directions were collected simultaneously during the machining of the straight line, along with the Acoustic Emission (AE) signals. The results show that the classification rate of tool wear monitoring with the constant clamping force in machining is improved from 85% to 94.8% with the implement of the modified RHMMs comparing to the one with traditional HMMs. With the varying clamping force setup, the classification rate is improved from 86.39% to 90.83%. In the analysis of applying the feature and decision fusion to the BPNN, HMMs, and RHMMs classifiers, the improvement of system robustness is also observed for the system with the RHMMs classifier. Although no clear difference of the classification rate between applying three classifiers is observed by evaluating the system by signals with the constant clamping force, the classification rate could be improved from 92.78% and 94.4% to 97.78%, respectively, by adopting the feature fusion integrated with RHMMs classifier comparing to the integration with BPNN and HMMS classifiers. With the implementation of decision fusion integrated with RHMMs, the classification rate could be improved from 93.96% and 90.83% to 96.39% comparing to the BPNN and HMMs classifiers.
Wu, P. L., and 吳佩霖. "A Study on the Milling Condition for Maximum Material Removal Rate under Constrant of Workpiece Temperature." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/89416311210395233375.
Full text國立成功大學
機械工程學系
88
The heat generated during metal cutting process will degrade the dimensional accuracy and surface integrity including residual stresses, micro-structural changes and cracks etc. First, the work temperature beneath the surface in an end milling process is analyzed with the moving heat source theory and the results are verified with experiments. In order to investigate the influences of the tools geometry and cutting conditions on the temperature on work surface, the cutting simulation software “AdvantEdge” in combination with Taguchi method is used to identify the significant parameters that affect the surface temperature of AL7075-T6. Further investigation shows how to maximize the metal removal rate under the constrained of maximum surface temperature.
HUANG, CHIEN-CHENG, and 黃建程. "A study for the effects of milling condition on the characteristics of ultra-thin multilayer ceramic capacitors." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/ruwhuj.
Full text國立高雄應用科技大學
化學工程與材料工程系碩士在職專班
105
Nowadays the MLCC industry is heading to the technologies of small size, thinner film, and higher stacking layers. Due to the difficulties of the process technology, the products are frequently have low yield rate and quality issues while manufacturing. This research will discuss the front process of a MLCC, slurry making. By introducing the different milling speed to find out the influence to MLCC characteristics, and finalize the optimal milling condition from the results of the MLCC electrical properties measurement and accelerated life test. From the results, it showed that the milling speed of 8 m/s gets the more homogeneous particle size distributed slurry, and there is no abnormal particle growth after sintering the samples. From measuring the properties of the capacity (Cap.) and the dissipation factor (Df), the stats were better and well-distributed. And from measuring the properties of the insulation resistance (I.R.) and breakdown voltage (BDV), it also performed better than that by other milling conditions, which obviously improved the product reliability, and raise the yield of MLCC electrical properties to 91.5 % from it was originally, 79.6 %.
Govender, André. "Development of a condition monitoring philosophy for a pulverised fuel vertical spindle mill." Thesis, 2016. http://hdl.handle.net/10539/21156.
Full textThe quantity and particle size distribution of pulverised coal supplied to combustion equipment downstream of coal pulverising plants are critical to achieving safe, reliable and efficient combustion. These two key performance indicators are largely dependent on the mechanical condition of the pulveriser. This study aimed to address the shortfalls associated with conventional time-based monitoring techniques by developing a comprehensive online pulveriser condition monitoring philosophy. A steady-state Mill Mass and Energy Balance (MMEB) model was developed from first principles for a commercial-scale coal pulveriser to predict the raw coal mass flow rate through the pulveriser. The MMEB model proved to be consistently accurate, predicting the coal mass flow rates to within 5 % of experimental data. The model proved to be dependent on several pulveriser process variables, some of which are not measured on a continuous basis. Therefore, the model can only function effectively on an industrial scale if it is supplemented with the necessary experiments to quantify unmeasured variables. Moreover, a Computational Fluid Dynamic (CFD) model based on the physical geometry of a coal pulveriser used in the power generation industry was developed to predict the static pressure drop across major internal components of the pulveriser as a function of the air flow through the pulveriser. Validation of the CFD model was assessed through the intensity of the correlation demonstrated between the experimentally determined and numerically calculated static pressure profiles. In this regard, an overall incongruity of less than 5 % was achieved. Candidate damage scenarios were simulated to assess the viability of employing the static pressure measurements as a means of detecting changes in mechanical pulveriser condition. Application of the validated pulveriser CFD model proved to be highly advantageous in identifying worn pulveriser components through statistical analysis of the static pressure drop measured across specific components, thereby demonstrating a significant benefit for industrial application.
MT2016
Chang, Ling-Fang, and 張齡方. "The development of tool condition and cutting quality monitoring in PZT/Si wafer micro milling by Neural Network and AE signal." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/05055167633364193711.
Full text國立中興大學
機械工程學系所
102
Micro-mechanical machining holds the advantage of machining complex feature in micro scale with various types of material and draws much more attention recently due to the increase demand in micro device with various types of material. However, the high tool wear rate in machining brittle material such as silicon and PZT limits its application in mass production. The development of tool wear and surface quality monitoring in machining PZT/Si wafer with the diamond thin film deposited micro mill was focused in this study. The system includes the acoustic emission signal collection, feature selection, and classification models. The class-mean scatter criteria were used in the feature selection, and the back propagation neural network was used for the classifier design. In order to collect the data for the system development and verification, an experiment was conducted on a PMC micro machining center with the diamond film deposited micro mill. In machining, the AE signal and cutting force was collected and analyzed for the delamination of the diamond thin film from tool and tool wear, as well as the quality change on the bottom surface of machined slot. The results show that the close relationship between the AE signal and the tool condition was confirmed, as well as the surface quality of machined slot. With the proper selection of features and number of training samples, higher than 94% classification rate can be obtained for the film delamination and tool wear with the developed system in machining the PZT/Si wafer with the thin film deposited micro tool. Moreover, 100% classification rate can be obtained for the quality monitoring.