Dissertations / Theses on the topic 'Strength of the cutting'
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Molinaro, Marco. "Understanding the Strength of General-Purpose Cutting Planes." Research Showcase @ CMU, 2013. http://repository.cmu.edu/dissertations/257.
Full textÖhman, Felix. "Comparing the Effectiveness of Punching to Laser Cutting in UltraHigh Strength Steel." Thesis, KTH, Materialvetenskap, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-298429.
Full textDenna studie undersöker effektiviteten av stansning jämfört med laserskärning i plåt av Ultra High Strength Steel (UHSS). Studien genomfördes för att bestämma vilken process som är effektivare med avseende på plåttjocklek, där kvaliteten på den skurna kanten också tas i beaktning vare sig stansning rekommenderas över laserskärning. Behovet av information kring stansning i UHSS kommer att öka i och med att UHSS blir vanligare. En enkel sikt, med måtten 1x1 m, med 169 hål, Ø = 15 mm, var utformningen av plåten som användes för att testa och jämföra stansning med laserskärning. Simuleringar av att stansa två plåtar av Hardox® 500 Tuf gjordes, med en tjocklek av 4 mm respektive 5 mm. Laserskärningen simulerades också, där en plåttjocklek på 4,5,6 och 8 mm testades, där både en 6 kW laser och en 10 kW laser simulerades. Lasrarna använder O2 som högtrycksgas. Stanstiden beräknades med hjälp av parametrar som används för material med materialegenskaper mellan S355 och rostfritt stål, eftersom man ansåg att stansningshastigheten mer eller mindre förblir densamma för olika material. Skärtiden för laser påverkas knappt av legeringsämnen och därför beräknas skärtiden för Hardox® 500 Tuf vara samma som skärtiden för S355. Simuleringarna av stansning och laserskärning samt ritningen för provets utformning, gjordes av företaget Weland AB. Ingen fysisk stansning gjordes på grund av brist på rätt verktyg. Simuleringarna av både stansning och laserskärning resulterade i att stansning var sju till åtta gånger snabbare än laserskärning. Men på grund av de extrema egenskaperna hos Hardox® 500 Tuf, spekuleras det att kvaliteten på den skurna kanten hos de stansade plåtarna vara undermålig, och lämpar sig då ej för typiska slitplåtstillämpningar. Det rekommenderas därför att laserskära Hardox 500® Tuf tills ytterligare forskning har utförts.
Medvedeva, Anna. "Performance of advanced tool steels for cutting tool bodies." Doctoral thesis, Karlstads universitet, Avdelningen för maskin- och materialteknik, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-5630.
Full textRay, Nathan. "Correlation between machining monitoring signals, cutting tool wear and surface integrity on high strength titanium alloys." Thesis, University of Sheffield, 2018. http://etheses.whiterose.ac.uk/20660/.
Full textFarrapo, Samily de Paulo. "Glycerines gross and semipurified on cutting power quails." Universidade Federal do CearÃ, 2015. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=15952.
Full textObjetivou-se avaliar o uso das glicerinas mista e bruta na alimentaÃÃo de codornas de corte. Foram executados dois experimentos, sendo um de digestibilidade para determinar os valores energÃticos da glicerina vegetal bruta e da mista semipurificada. No segundo experimento avaliou-se o desempenho, caracterÃsticas da carcaÃa e da carne de codornas de corte recebendo diferentes nÃveis de inclusÃo dessas glicerinas nas dietas. No ensaio de digestibilidade utilizou-se 180 codornas de corte, dos 14 aos 21 de idade, alojadas em gaiolas para estudos metabÃlicos, distribuÃdas em delineamento inteiramente casualizado em esquema fatorial 2x2+1, sendo 2 nÃveis de substituiÃÃo da raÃÃo referÃncia pela glicerina (10 e 20%), dois tipos de glicerinas (vegetal e mista), mais a raÃÃo referÃncia, totalizando 5 tratamentos com 6 repetiÃÃes de 6 aves. O perÃodo experimental foi de oito dias, sendo quatro para a adaptaÃÃo e quatro para coleta total de excretas. A glicerina vegetal bruta apresentou maior energia metabolizÃvel aparente corrigida pelo balanÃo do nitrogÃnio com base na MS (EMAn kcal/kgMS), como na MN (EMAn kcal/kgMN), 5.195 e 4.759, contra 3.884 e 3.472 para a glicerina mista semipurificada, para os valores energÃticos, respectivamente. No segundo experimento utilizou-se 432 codornas de corte de 1 a 42 dias de idade, distribuÃdas em delineamento inteiramente casualizado em esquema fatorial 2x4+1, sendo 2 tipos de glicerinas (vegetal e mista), 4 nÃveis de inclusÃo de glicerinas nas dietas (5, 10, 15 e 20%), mais a raÃÃo controle, sem inclusÃo de glicerina, totalizando 9 tratamentos com 4 repetiÃÃes de 12 aves. Aos 42 dias as aves passaram por jejum sÃlido de oito horas, para o abate, sendo duas aves de cada repetiÃÃo separadas dentro do peso mÃdio, para posteriores anÃlises. Avaliou- se o consumo de raÃÃo, ganho de peso, conversÃo alimentar, rendimento de carcaÃa, de cortes (peito e coxa+sobrecoxa), teor de gordura abdominal, biometria dos ÃrgÃos (fÃgado, coraÃÃo e moela), amÃnia volÃtil, umidade e PH da cama, bem como as caracterÃsticas fÃsicas e sensoriais da carne. Os dados foram submetidos à anÃlise de variÃncia e os nÃveis de inclusÃo das glicerinas, foram desdobrados em polinÃmios. Para comparaÃÃo em relaÃÃo ao tratamento controle, foi utilizado o teste de Dunnett (5%). Observou-se diferenÃa para o desempenho, onde a glicerina mista proporcionou maiores resultados para consumo de raÃÃo em todos os perÃodos analisados, bem como na conversÃo alimentar de 1 a 21 dias e de 1 a 42 dias de idade das codornas. NÃo foi observada diferenÃa entre as glicerinas utilizadas para a amÃnia volÃtil, enquanto entre os nÃveis de inclusÃo das glicerinas houve efeito linear crescente para essa variÃvel à medida que se adicionou qualquer das glicerinas nas raÃÃes. O pH da cama foi superior ao se utilizar qualquer nÃvel de inclusÃo da glicerina vegetal quando comparado ao tratamento controle, bem como a partir de 10% de inclusÃo os valores de pH sÃo maiores ao se utilizar a glicerina vegetal e nÃo a mista. Nenhum dos fatores analisados interferiu no teor de umidade da cama. NÃo foram observadas diferenÃas para o rendimento, jà a gordura abdominal mostrou-se maior nas aves que consumiram raÃÃo contendo glicerina vegetal. Para as caracterÃsticas fÃsicas da carne considerou-se a perda de peso por cocÃÃo, forÃa de cisalhamento e capacidade de retenÃÃo de Ãgua, onde os dados para os nÃveis de inclusÃo das glicerinas foram desdobrados em polinÃmios, enquanto que para as glicerinas usado o Teste F. Jà para as caracterÃsticas sensoriais, aroma, cor, sabor e avaliaÃÃo global, as mÃdias foram comparadas pelo teste de Ducan a 5%. O uso de glicerina vegetal ou mista nÃo interferiu nas caracterÃsticas sensoriais da carne de codorna (P>0,05), podendo ser usada em atà 20% de inclusÃo nas raÃÃes. Para as caracterÃsticas fÃsicas houve diferenÃa (P<0,05) para forÃa e cisalhamento sendo os nÃveis 12,5% da GMS e 12,78% da GVB os que apesentaram melhores resultados. Para PPC e CRA nÃo houve diferenÃa (P> 0,05) entre os tratamentos analisados. Conclui-se que as duas glicerinas possuem potencial para serem utilizadas atà 20% na alimentaÃÃo de codornas, sem prejudicar o ganho de peso, o rendimento e a qualidade da cama, sendo a glicerina bruta a que apresenta maior quantidade de energia. No entanto, 13% de inclusÃo de glicerina nas raÃÃes de codorna proporciona uma carne mais suculenta.
The objective was to evaluate the use of mixed and gross glycerines on slaughter quail. Two experiments were performed, one of digestibility to determine the energy values of crude vegetable glycerin and semipurified mixed. The second experiment evaluated the performance, carcass characteristics and meat quail meat receiving different levels of inclusion in the diets of these glycerides. In the digestibility assay was used 180 quails, from 14 to 21 of age, housed in cages for metabolic studies, distributed in a completely randomized design in a factorial 2x2 + 1, 2 ration of replacement reference levels for glycerin (10 and 20%), two types of glycerides (crop and mixed), the more the reference diet, totaling five treatments with 6 replications of 6 birds. The experiment lasted eight days, four for adaptation and four for excreta collection. Gross vegetable glycerin had a higher apparent metabolizable energy corrected by nitrogen balance based on MS (AMEn kcal / kgMS) as the MN (AMEn kcal / kgMN), 5,195 and 4,759, against 3,884 and 3,472 for the semipurified mixed glycerin to the energy values, respectively. In the second experiment we used 432 quails 1- 42 days old, distributed in a completely randomized design in a factorial 2x4 + 1, 2 types of glycerides (vegetable and mixed), 4 glycerines inclusion levels in diets (5, 10, 15 and 20%) over control diet without the addition of glycerin, a total of 9 treatment with 4 replications of 12 birds. At 42 days the birds have undergone solid fasting for eight hours for slaughter, two birds of each separate repetition within the medium weight, for further analysis. It were evaluate the feed intake, weight gain, feed conversion, carcass yield, cuts (breast and thigh + drumstick), abdominal fat, biometry of the organs (liver, heart and gizzard), volatile ammonia, moisture and PH of the bed, as well as physical and sensory characteristics of meat. Data were subjected to analysis of variance and levels of inclusion of glycerides, they were deployed in polynomials. For comparison compared to the control treatment was performed using the Dunnett's test (5%). Difference was observed for performance, where the mixed glycerol provided greater results for feed intake in all periods analyzed, as well as feed conversion 1-21 days and 1-42 days of age of quail. No difference was observed between the glycerides used for volatile ammonia, while between the levels of inclusion of glycerines there was increasing linear effect for this variable as they added either glycerines in feed. The pH was superior to the bed using any inclusion level of vegetable glycerin compared to the control treatment and from 10% to include the pH values are higher when using the vegetable glycerine and not mixed. None of the analyzed factors interfered with the moisture content of the bed. There were no difference for yield, since abdominal fat was higher in birds fed diet containing vegetable glycerin. For the physical characteristics of the meat considered the weight loss for cooking, shear strength and water holding capacity, where data for inclusion levels of glycerides were deployed in polynomials, while for the glycerides used Test F . As for the sensory characteristics, aroma, color, flavor and overall evaluation, the means were compared by 5% Duncan test. The use of vegetable glycerin mixed or no effect on the sensory characteristics of quail meat (P>0.05), can be used in up to 20% inclusion in diets. For the physical difference (P <0.05) for strength and shear levels being 12.5% of GMS and 12.78% of GVB apesentaram that the best results. CRA for PPC and there was no difference (P> 0.05) between treatments analyzed. It follows that the two glycerides have potential to be used up to 20% in the feed quail, without harming the weight gain, the yield and quality of the bed, and the crude glycerin presents the highest amount of energy. However, 13% inclusion of glycerin in quail rations provides a more succulent meat.
Stenberg, Thomas. "Fatigue properties of cut and welded high strength steels : Quality aspects in design and production." Doctoral thesis, KTH, Lättkonstruktioner, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-188225.
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Gram, Michael D. "Fineblanking of High Strength Steels: Control of Materials Properties for Tool Life." The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1280869210.
Full textBi, Wu. "Racking Strength of Paperboard Based Sheathing Materials." Miami University / OhioLINK, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=miami1091059928.
Full textStater, Lydia M. "Female Friendship: Strength Found Through Support." Kent State University Honors College / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=ksuhonors1525691709141172.
Full textБуковський, Олег Миколайович. "Підвищення ефективності обробки отворів малих розмірів в умовах автоматизованого виробництва." Master's thesis, Київ, 2018. https://ela.kpi.ua/handle/123456789/25648.
Full textMaster's attestation work on the topic: "Improving the efficiency of processing apertures of small sizes in the conditions of automated production" consists of 109 sheets. It includes 18 pictures, 30 tables, 3 attachments. 52 bibliographic titles were used in the work. The task of this work is to develop a system for improving the processing efficiency of small-sized apertures in the conditions of automated production. The existing methods of increasing the efficiency of processing small-sized apertures in the conditions of automated production are analyzed, the methods of their forming are considered, the theoretical study of the features of the cutting process during drilling of apertures has been carried out, the influence of cutting speed, properties of the treated material, the diameter of the drill, the filing and the temperature of cutting on the efficiency of processing the apertures of small sizes. As a result of the research, it was decided to develop an automated system for improving the efficiency of small-sized aperture processing, which is based on measuring the cutting forces and torque of the drilling process. For its realization a mathematical model, a basic scheme of work was created, an algorithm of its work was created and the necessary software was created. The research of increase of efficiency of processing of apertures of small sizes with the help of a full factor experiment has been carried out. The results of this work can be used by state-owned enterprises to improve the efficiency of processing small-sized apertures in the conditions of automated production by controlling the cutting process.
Diaz, Infante Hernandez David Alberto. "Prediction and Prevention of Edge Fracture in Forming of AHSS." The Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1563371149338966.
Full textHaddad, Fares. "Etude de l'influence de la structure métallurgique sur l'usinabilité des aciers à hautes caractéristiques mécaniques." Thesis, Paris, HESAM, 2020. http://www.theses.fr/2020HESAE003.
Full textDuring the past decade, the automotive industry is increasingly relying on new grades of high strength steels. Companies involved in this sector aim to produce lighter, more effective vehicles that are both fuel-efficient and guarantee a high level of safety for its passengers. New structures have emerged on the market presenting an opportune correlation between high mechanical resistance and ductility. However, this increase in mechanical properties is most often achieved at the expense of the machinability of steels in question.The results of previous works have motivated a detailed study that focuses on the influence of the metallic structure on the machinability of steels. The work compares the behavior of low-carbon steels obtained by controlled cooling with that of a conventional steel in both the quenched and tempered state and the bainitic state. The thermomechanical conditions at the tool / chip interface during cutting are identified by measuring the cutting forces and investigating the chips morphology and microstructure. The cutting-tool life expectancy is quantified and the different modes of insert wear are studied
Wirnsperger, Franz. "Laserstrahltiefschweißen hochfester Feinkornbaustähle in der Serienproduktion: Experimentelle Bewertung werkstoffbedingter und fertigungstechnischer Einflüsse auf die Prozess- und Verbindungsstabilität." Universitätsverlag Chemnitz, 2020. https://monarch.qucosa.de/id/qucosa%3A71721.
Full textIn the industrial series processing of high-strength fine grain steels, it was found that different steels of the same strength class can lead to different welding results by the laser beam keyhole welding process. The material-related influences on the molten pool behavior have not yet been investigated in any known research. This research work extends the state of knowledge with new findings from extensive material analysis and welding tests. This new findings made it possible to describe a holistic explanatory model of the material-related influences in the laser beam keyhole welding of high-strength fine grain steels. On the one hand, this work focused on the analysis of the chemical composition of the base materials and the effects of the alloying elements on the weld preparation in combination with the laser cutting process. On the other hand, the effect of the chemical base material composition on the melt pool behavior during laser keyhole welding process was specifically investigated. The welding parameters and the use of filler material were kept constant so that comparative analysis of the welding results was possible. The sheet thicknesses were varied so that full penetration and partly penetration I-seam-butt-welds could be analyzed. While welding full penetration welds, the surface of the molten pool as well as the root of the melt pool was analyzed by a high-speed camera equipped with laser light filter. For the partly penetration welds, the effect of the different cutting edge conditions on the penetration depth and the weld penetration geometry was investigated on more than 100 macro sections. The investigations have shown that the type of cut edge treatment after the laser beam cutting process leads to different cutting edge conditions depending on the material. These different conditions can subsequently strongly influence the welding results. Base-material-related differences in the penetration shape and in the solidification structure were detected in the cross sections even on seams welded on mechanically processed edge preparations. After laser beam cutting, untreated and thus cut-oxide-containing cut edges lead to a stabilization of the keyhole and increase the penetration depth significantly. This effect could also be observed with manually applied SiO2 on the mechanically processed edge preparations before welding. The positive effects of oxides, which are existing directly in the weld preparation groove, were first detected with the experimental investigations during this work. With regard to the selected welding parameter sets, the oxides that are directly on the weld preparation edges are the dominant influence option in the laser beam keyhole welding process. Comparisons of the mechanical-technological joint properties at different cutting edge conditions and welding tests with different protective gas compositions showed the impacts of various joint preparations on the final welding results. By combining previous experience with the results of this work, a holistic explanatory model was developed, which describes the influence of the base material composition along the process chain and makes the material-dependent differences of the welding results of the laser beam keyhole welding process comprehensible. The findings of this work enable a better understanding of the process and show new possibilities for increasing efficiency in the concerned sheet metal processing chain with laser technologies.:1 Einleitung 2 Zielsetzung 3 Stand der Technik 4 Experimentelles 5 Ergebnisse der experimentellen Untersuchungen 6 Zusammenfassung und Diskussion der Ergebnisse 7 Schlussfolgerungen und Ausblick
Oen, Richard James. "Measuring cutting forces on a metal cutting lathe." Ohio : Ohio University, 1989. http://www.ohiolink.edu/etd/view.cgi?ohiou1182447008.
Full textOen, Jr Richard James. "Measuring cutting forces on a metal cutting lathe." Ohio University / OhioLINK, 1989. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1182447008.
Full textSircom, Margaret A. "Cutting clear." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/MQ47766.pdf.
Full textLotfalian, Majid. "Cutting Principles." Sari University of Agricultural Sciences and Natural Resources, 2012. https://slub.qucosa.de/id/qucosa%3A17076.
Full textEs handelt sich um ein Kapitel aus einem Buch, das 2012 im persischer Sprache veröffentlicht wurde. Darin werden die physikalischen und statischen Prinzipien von Bäumen dargestellt und die Methoden erklärt, mit denen Bäume korrekt gefällt werden können: aufrechte Bäume, Bäume mit einem leichten und starken Hang, Spezialfällung, Fällung am Steilhang und von Hängern, Einsatz einer Winde.:1. Review of the physical basis of the forces involved in cutting and bucking 1.1. Vector and scalar quantities 1.2. Weight 1.3. Center of gravity 1.4. Fulcrum 1.5. Forces and torque 1.6. Relations between vectors 1.7. Levers 1.7.1. Single and double levers of the first class 1.7.2. Single and double levers of the second class 1.7.3. Single and double levers of the third class 1.8. Efficiency and mechanical advantage 1.9. Work 1.10. Wedge 2. Correct methods in felling trees 2.1. Balanced trees 2.2. Low leaning trees 2.2.1. Felling the low leaning trees in the leaning direction 2.2.2. Felling trees with a low leaning in the side direction of leaning 2.2.3. Felling trees with light leaning in opposite of leaning direction 2.3. Trees with heavy leaning 2.3.1. Felling trees with heavy leaning in leaning direction 2.3.2. Felling trees with heavy leaning in side of leaning direction 2.3.3. Felling trees with heavy leaning in opposite of leaning direction 2.4. Felling of special trees 2.5. Felling of trees in steep slopes 2.6. Release of hang up trees 2.7. Using winch 2.7.1. Felling of trees in leaning direction using winch 2.7.2. Felling of trees in side of leaning direction using winch 2.7.3. Felling of trees in opposite of leaning direction using winch 2.7.4. Safety measures in use of winch
Addala, Srikanth. "Relationship between cutting parameters and bit geometry in rotary cutting." Morgantown, W. Va. : [West Virginia University Libraries], 2000. http://etd.wvu.edu/templates/showETD.cfm?recnum=1553.
Full textTitle from document title page. Document formatted into pages; contains x, 71 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 64-68).
MacBeath, Alan. "Ultrasonic bone cutting." Thesis, University of Glasgow, 2006. http://theses.gla.ac.uk/2220/.
Full textToksvig-Larsen, Søren. "On bone cutting." Lund : University Dept. of Orthopedics, 1992. http://books.google.com/books?id=3JBsAAAAMAAJ.
Full textBass, Matthew L. "Cutting Into Relief." BYU ScholarsArchive, 2013. https://scholarsarchive.byu.edu/etd/3416.
Full textJalap, Joakim. "Cutting the Sentiment." Thesis, KTH, Skolan för datavetenskap och kommunikation (CSC), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-153965.
Full textI detta examensarbete har vi anpassat en grafmetod som användes av Pang och Lee till att inte använda maskininlärningstekniker, så att den kan användas för “near real time” sentimentanalys. Maskininlärningssteget har ersatts men en nyskapande metod för att konstruera ett positivt respaktive ett negativt dokument. Dessa är positiva respektive negative med avseende på de substantiv som bedöms vara viktigast i korpuset, och nämnda substantiv extraheras meden algoritm utvecklad av Cataldi et al. Detta gör att vi kan ersätta maskininlärningsstegeti Pand och Lees algoritm med en semantisk matchning mellan dokumenten som skall klassificeras och de konstruerade dokumenten.Vi finner att TF-IDF inte är en lämplig metod för att urskilja sentiment och vi gör också en del allmänna observationer angående svårigheter med att använda minimala-snittet-metoder i en nästan komplett graf. Metoden som beskrivs ger bättre resultat för negativa recensioner än för positiva och några möjliga skäl till detta diskuteras också.
Anderson, I. "A study of the dynamic cutting characteristics of roadheader cutting heads." Thesis, University of Newcastle Upon Tyne, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.315535.
Full textLätzer, Michael. "Füge- und Übertragungsverhalten torsionsbelasteter Stahl-Aluminium-Rändelpressverbindungen." Doctoral thesis, Universitätsbibliothek Chemnitz, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-200348.
Full textThe present thesis provides analytical, numerical and experimental fundamental studies for the joining behaviour and the transmission behaviour of a friction and form closure steel-aluminum knurled interference fit. The special feature of this connection is a knurled and oversize hard steel shaft, longitudinally pressed in a soft aluminum hub with a circular bore. The most important parameter for the joining process is the shaft chamfer angle φ. Due to the shaft chamfer angle φ the material of the hub will be formed or cutted during the joining process. By using the relative strength, the quotient of push out force and joining force who describes the joint strength, a first quality parameter for a precise selection of steel-aluminum knurled interference fit has been derived. The description of the experimentally determined torque - twisting angle – curves has shown areas of design criterion and mechanical breakdown. The maximum transmittable torque is achieved by reaching the shearing stress of the knurls in the hub - mechanical breakdown τ S. Similar to the joining and the push out behaviour, the positive influence of the shaft chamfer angle φ is also shown at the transmittable torque. Furthermore, knurled interference fits joined by forming can transmit higher torques of about 40% than interference fits joined by cutting due to the material hardening. The mechanical-physical model for calculating the static transmittable torque is based on the serration connection. Thus, the torque at the design criterion and the maximum transmittable torque at the mechanical breakdown can be found. The consideration of the forming or cutting joining process is described as a function of the shaft chamfer angle φ using the so-called angle-based plastic strain ε plRPV
Ottman, Michael J., and M. T. Rogers. "Alfalfa Yield Response to Cutting Height and Cutting at Dawn and Dusk." College of Agriculture, University of Arizona (Tucson, AZ), 2000. http://hdl.handle.net/10150/204089.
Full textWikborg, Uno. "Online Meat Cutting Optimisation." Thesis, Norwegian University of Science and Technology, Department of Computer and Information Science, 2008. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-8887.
Full textNortura, Norways largest producer of meat, faces many challenges in their operation. One of these challenges is to decide which products to make out of each of the slaughtered animals. The meat from the animals can be made into different products, some more valuable than others. However, someone has to buy the products as well. It is therefore important to produce what the customers ask for. This thesis is about a computer system based on online optimisation which helps the meat cutters decide what to make. Two different meat cutting plants have been visited to specify how the system should work. This information has been used to develop a program which can give a recommendation for what to produce from carcasses during cutting. The system has been developed by considering both the attributes of the animals and the orders from the customers. The main focus of the thesis is how to deal with the fact that the attributes are only known for a small number of the animals, since they are measured right after slaughtering. A method has been made to calculate what should be made from the different carcasses, and this method has been realised with both exact and heuristic algorithms.
Wyeth, David James. "The mechanics of cutting." Thesis, University of Reading, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.494413.
Full textLönnerberg, Mattias. "Cutting Tetrahedra : Affordances and Limitations of Using Virtual Reality Visualization for Tetrahedral Cutting." Thesis, KTH, Skolan för datavetenskap och kommunikation (CSC), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-211544.
Full textForskare försöker skapa algoritmer för att optimalt skära komplexa 3D former i flera tetraeder för att simplifiera simuleringar. Det är svårt att skapa en mental representation av 3D figurerna när dom blir mer komplexa. En virtual reality visualisering skulle kunna hjälpa till att skapa denna mentala 3D representation. Genom att skapa ett verktyg för en dator med 2D monitor och ett verktyg som använder VR och därefter jämföra dem i en kontrollerad användarstudie med upprepade försök, visade det sig att VR gav en bättre förståelse av 3D objekten. Det var dessutom mer intuitivt och njutbart. Dock minskade det inte tiden som behövdes för att avsluta studiens uppgifter och trots att användarna uppfattade att dom var mer pricksäkra i VR så påvisade den observerade datan att användare gjorde mer träffsäkra skärningar i verktyget utan VR.
Нагорний, Володимир В`ячеславович, Владимир Вячеславович Нагорный, and Volodymyr Viacheslavovych Nahornyi. "Diagnosis of cutting tool by the sound that accompanies the process of cutting." Thesis, Сумський державний університет, 2013. http://essuir.sumdu.edu.ua/handle/123456789/33557.
Full textPivetta, Carlos Sergio. "Uma contribuição ao estudo do fresamento de aço endurecido com fresa de topo esferico." [s.n.], 2005. http://repositorio.unicamp.br/jspui/handle/REPOSIP/265603.
Full textDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecanica
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Resumo: O fresamento de cavidades de moldes e matrizes em material endurecido usando ferramenta de topo esférico tem limitações em termos de profundidades das cavidades, da taxa de remoção de cavaco e da vida da ferramenta. Algumas operações de fresamento em cavidades profundas não podem ser realizadas, devido à necessidade de se ter ferramenta com alto balanço, o que gera vibração e, em conseqüência, danos à rugosidade da peça e à vida da ferramenta. Outro ponto ainda não totalmente compreendido é a influência da rugosidade deixada na peça pela operação anterior, na rugosidade da operação de acabamento, já que, devido às baixas profundidades utilizadas nesta operação, a rugosidade da operação anterior pode influenciar a profundidade real removida. O principal objetivo deste trabalho é verificar a influência da relação comprimento/diâmetro da ferramenta (balanço), da rugosidade da operação anterior e da velocidade de corte na rugosidade da peça e na vida da ferramenta de fresamento em acabamento. Para isto foram realizados ensaios de fresamento em aço endurecido AISI D2 (58 HRC) com ferramenta de ponta esférica de metal duro recoberto, variando-se os citados parâmetros de influência. Dentre as conclusões deste trabalho, pode-se destacar: nem a rugosidade da operação anterior, nem o balanço da ferramenta influenciaram a rugosidade da peça, pelo menos nos níveis utilizados neste trabalho; com balanço da ferramenta pequeno, consegue-se baixos valores de desgaste e, com isso, longa vida da ferramenta, mas quando se utiliza conjuntamente balanço da ferramenta e velocidades de corte altas, a vida da ferramenta é bastante reduzida
Abstract: The milling of molds and dies cavities carried out on hardened steel using ball end mill presents limitations in terms of cavity depth, metal removal rates and tool life. Some milling operations on deep cavities are not possible due to the require of long tool overhang, what generates vibrations and, consequently, resulted in poor surface roughness and short tool life. Other point which is not totally understood up to the present is the influence of the surface roughness obtained in the previous operation on the results of finishing operation because on finishing operations, the actual depth of cut is not much larger than the height of roughness left on the surface by the previous operation. The main objective of this work is to verify the influence of the ratio tool overhang/ tool diameter, the roughness of the previous operation and cutting speed on the tool wear in finishing operations. Besides, it also intends to verify the influence of tool wear on the tool vibration, measured through the real time tool deflection. Milling experiments on AISI D2 hardened steel (58 HRC) were carried out using coated (TiNAl) carbide ball end mills with the input variables already mentioned. The main conclusions of this experiments, for the used conditions, were: the previous surface roughness neither the tool overhang have influence on the resulting surface roughness; when the tool overhang was the lowest one, cutting speed did not influence so much tool wear, but when the highest tool overhang was used, cutting speed presented a strong influence on tool wear
Mestrado
Materiais e Processos de Fabricação
Mestre em Engenharia Mecânica
Schmidt, Stuart. "Applied rock cutting : a study of partial face disc cutting with blunt disc cutters /." [St. Lucia, Qld.], 2005. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe18740.pdf.
Full textMisner, Scottie, and Carol Curtis. "Cutting Boards (Plastic versus Wood)." College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 2008. http://hdl.handle.net/10150/146435.
Full textRevised
Which is better, wooden or plastic cutting board? Recent research has confirmed the conventional belief that plastic is safer than wood for cutting meat and poultry. This article explains the reason why plastic cutting boards are better, and gives recommendations on how to keep cutting boards safe.
Harper, John. "Alfalfa Yield and Cutting Interactions." College of Agriculture, University of Arizona (Tucson, AZ), 1985. http://hdl.handle.net/10150/200496.
Full textDooley, S. "Biodegradation of machine cutting oil." Thesis, University of Cambridge, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.598601.
Full textAluko, O. B. "Brittle fracture in soil cutting." Thesis, University of Newcastle Upon Tyne, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.383949.
Full textGram, Greta. "SUN PIECE : actions of cutting." Thesis, Högskolan i Borås, Institutionen Textilhögskolan, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-17071.
Full textProgram: Modedesignutbildningen
Zhang, Tao. "High power disk laser cutting." Thesis, University of Cambridge, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.609511.
Full textHendricks, Brian Reginald. "Simulation of plasma arc cutting." Thesis, Peninsula Technikon, 1999. http://hdl.handle.net/20.500.11838/1245.
Full textThe simulation of Plasma Arc Cutting is presented in this study. The plasma arc cutting process employs a plasma torch with a very narrow bore to produce a transferred arc to the workpiece. A technique for modelling plasma arc cutting has been developed by applying the thermo-metallurgical model to the process and integrating a model of material removal to this model. The model is solved using the finite element method using the FE package SYSWORLD, more specifically SYSWELD. The objective is to determine the minimum energy required to cut a plate of some thickness using this virtual model. The characteristics of the cut need to exhibit the characteristics of a "high quality cut". The model presented can predict the kerf size given certain process variable settings. The numerical results obtained are assessed by conducting experiments. By maintaining Ill1rumum energy input cost savings can be made through energy savings, limiting additional finishing processes and reducing expense of shortening the electrode and nozzle lifetimes. The modelling of the PAC process using virtual design techniques provides a cost-effective solution to the manufacturing industries with respect to process specification development. This plays an important role in South Africa's transition into a competitive global market. It is envisaged that the model will provide an alternative more efficient, non-destructive means of determining the optimum process variable settings for the plasma arc cutting process.
Goulimis, Constantine Nicholas. "The cutting stock problem revisited." Thesis, Imperial College London, 2011. http://hdl.handle.net/10044/1/8159.
Full textHashemzadeh, Majid. "Investigations into fibre laser cutting." Thesis, University of Nottingham, 2014. http://eprints.nottingham.ac.uk/14057/.
Full textJohnson, Eric P. "Composite strength statistics from fiber strength statistics." Thesis, Monterey, California. Naval Postgraduate School, 1991. http://hdl.handle.net/10945/26420.
Full textXu, Shunli. "Modelling the cutting process and cutting performance in abrasive waterjet machining with controlled nozzle oscillation." Queensland University of Technology, 2006. http://eprints.qut.edu.au/16237/.
Full textSimpson, Angela. "The lived experience of self-cutting and recovery from self-cutting : a co-grounded theory." Thesis, University of Newcastle Upon Tyne, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.417550.
Full textTangtatswas, Pitjaya. "ALGORITHM FOR THE CUTTING STOCK PROBLEM WITH MULTIPLE RAWS AND LIMITED NUMBER OF CUTTING KNIVES." Case Western Reserve University School of Graduate Studies / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=case1486572677758349.
Full textLätzer, Michael. "Füge- und Übertragungsverhalten torsionsbelasteter Stahl-Aluminium-Rändelpressverbindungen." Doctoral thesis, Universitätsverlag der Technischen Universität Chemnitz, 2015. https://monarch.qucosa.de/id/qucosa%3A20428.
Full textThe present thesis provides analytical, numerical and experimental fundamental studies for the joining behaviour and the transmission behaviour of a friction and form closure steel-aluminum knurled interference fit. The special feature of this connection is a knurled and oversize hard steel shaft, longitudinally pressed in a soft aluminum hub with a circular bore. The most important parameter for the joining process is the shaft chamfer angle φ. Due to the shaft chamfer angle φ the material of the hub will be formed or cutted during the joining process. By using the relative strength, the quotient of push out force and joining force who describes the joint strength, a first quality parameter for a precise selection of steel-aluminum knurled interference fit has been derived. The description of the experimentally determined torque - twisting angle – curves has shown areas of design criterion and mechanical breakdown. The maximum transmittable torque is achieved by reaching the shearing stress of the knurls in the hub - mechanical breakdown τ S. Similar to the joining and the push out behaviour, the positive influence of the shaft chamfer angle φ is also shown at the transmittable torque. Furthermore, knurled interference fits joined by forming can transmit higher torques of about 40% than interference fits joined by cutting due to the material hardening. The mechanical-physical model for calculating the static transmittable torque is based on the serration connection. Thus, the torque at the design criterion and the maximum transmittable torque at the mechanical breakdown can be found. The consideration of the forming or cutting joining process is described as a function of the shaft chamfer angle φ using the so-called angle-based plastic strain ε plRPV.
Gerth, Julia Lundberg. "Tribology at the Cutting Edge : A Study of Material Transfer and Damage Mechanisms in Metal Cutting." Doctoral thesis, Uppsala universitet, Tillämpad materialvetenskap, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-183186.
Full textDai, Yu-Siang, and 戴于翔. "Strength of Silicon Wafer under Different Laser Cutting Conditions." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/nuv986.
Full text義守大學
機械與自動化工程學系
107
There are many cutting methods depending on the material characteristics. The reason for semi-conductor industry is that there are many advantages in the cutting process. Under the condition of non-contact processing,the energy of the laser beam and its moving speed Laser parameters can be adjusted according to material properties, and can be processed for a variety of metals and non-metals, especially for materials with high hardness, high brittleness, and high melting point, and no tool wear and increase cost during laser processing. Laser processing of its non-cutting force on the workpiece can increase the yield and stability. This study will explore the effect of ultrafast laser cutting on the strength of the wafer under different parameter settings, by observing the surface roughness of the sidewall and the different bending strength test schemes such as: Cantilever Beam The results of the Bending Test and the Three-Point Bending Test are presumed to be the cause of the test, and the improvement plan of the test machine is proposed under the existing experimental specifications.
CHUANG, CHIA-LUNG, and 莊佳龍. "Characterization of The effect of Pre-cutting to The Strength of Concrete by Using Cylindrical Specimen." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/7y2rbr.
Full text國立雲林科技大學
營建工程系
106
Pre-cutting is important for preventing random crack of concrete especially for slab. However, the strength of the concrete around the cutting reduces due to the damage caused by the cutting. The weakened edges of the cutting break easily in its early service life. Strengthening the edges is the only way to prevent the early breakage. To prevent using a real size concrete specimen, cylindrical concrete specimen is used in this study. Pre-cutting is applied, and the strength of the cut specimen is characterized. The decrease of the strength can be characterized by compared with that of the undamaged one. It is found that curing of the cut specimen may recover part of the strength.
Huang, Sheng-Fong, and 黃聖峰. "Analysis on structure strength and rigidity for CNC lathe of a simultaneous turning with multiple cutting-tool." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/77wxa8.
Full text國立虎尾科技大學
機械與電腦輔助工程系碩士班
104
Because domestic and foreign machinery manufacturing industry is facing fierce competition, development of complex, simultaneous machining with multiple cutting-tool and intelligent machine tools has become a new trend in the global machine tool development in recent years. Simultaneous processing technique could be overlapped such that machining time of parts may be reduced and the production efficiency can be enhanced consequently. However, due to design space limitation and cost consideration, the turret is usually replaced by a multiple cutting-tool post for a small and simultaneous turning machine. Therefore, it is hard to cover the structure rigidity and fluent movement of feeding mechanism in this multiple cutting-tool post structure in order to satisfy the requirement of dynamic rigidity under the maximum elongation of a simultaneous turning with multiple cutting-tool. In this paper, the machining quality of a simultaneous turning can be enhanced through the improvement both of the structure static and dynamic rigidities. First, for analysis reality, a turning experiment was carried out and the cutting forces were obtained as a boundary condition for stress and strain FEM analysis model. Next, the numerical and experimental modal analyses are performed for a CNC lathe of a simultaneous turning with multiple cutting-tool, and the natural frequency, damping ratio and mode shape of the structure are investigated consequently. At last, according to the above analyses in static and dynamic rigidities, the width of tool shank is widened to enhance the structure static rigidity based on a cantilever beam-deflection theory. Moreover, with reference to a column structure in the C-type machine-tool, increasing the supporting area at lower-half portion of the spindle, lowering the weight of structure and adding some reinforcement ribs at the same time to improve the dynamic rigidity. With the modification of tool shank width in consideration of cost factor, the FEM analysis results show that the maximum total displacement, maximum equivalent stress and strain are decreased about 26%, 38%, and 35%, respectively, in contrast to the dynamic rigidity is not improved significantly. In the final design improvement version, both the static and dynamic rigidities may be improved effectively, the maximum total displacement, maximum effective stress and strain are decreased about 30%, 38% and 35%, respectively. Under the maximum rotational speed of 5000rpm (83Hz) in this CNC lathe, the corresponding natural frequencies of the first-mode to third-mode were increased about 11%, 14% and 2%, respectively.
Lin, Tai-Huang, and 林泰宏. "The improvement on the bonding strength between diamond particles and the piano wire for high speed ingot cutting." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/evddnw.
Full text國立交通大學
工學院半導體材料與製程設備學程
101
This thesis is mainly researching for solar cell and light-emitting diode, it can divide ingot into wafer. In this manufacturing process, what it uses is the fixed-abrasive with high speed wire saw. According to the statistics, currently for those sapphire-processing factories in our country, the demand in every month of wire saw is more than 5,000Km, meanwhile adding the demand from solar cell industry, and its finical scale is definitely over ten million. Because of this reason, diamond will be generally used. However, the global market now has been monopolized by Japan Company and the price is always staying high. Therefore, in order to avoid the source monopolized by foreign countries, I worked on this research. This thesis mainly investigates the combination power between diamond and piano wire. In the process of experiment, through the researching and selection, we found that diamond by means of changing its essence of its surface can let our experiment reach the best conditions and that its surface with nickel can make it more magnetic. On the other hand, we can use the magnetic system to make piano wire magnetic and due to the magnet attracting principle diamond will naturally attach on the piano wire. Moreover, as the surface of diamond has coated nickel so when we do the coating procedure, we can coat both diamond and piano wire with nickel, coving the diamond with nickel. What it produced after the experiment is the cutting line and it can do the abrasive test for some stiff and crisp material. As a result, this test is also evidenced that the diamond through the changing of its essence on the surface is appreciate to produce high speed wire saw.