Quality Production Improvement - QPI最新文献_第8页

Numerical Simulation of Fluid Flow inside the Flow Control Valve 流量控制阀内流体流动的数值模拟

Quality Production Improvement - QPI Pub Date : 2019-07-01 DOI: 10.2478/cqpi-2019-0053

M. Domagala, H. Momeni, J. Fabis-Domagala, M. Krawczyk, G. Filo, S. Bikass

引用次数: 6

The Impact of the Melting and Pouring Process on the Quality of the Biggest Rocking Bell Called Vox Patris 熔炼和浇注工艺对最大摇钟质量的影响

Quality Production Improvement - QPI Pub Date : 2019-07-01 DOI: 10.2478/cqpi-2019-0031

D. Bartocha, C. Baron

{"title":"The Impact of the Melting and Pouring Process on the Quality of the Biggest Rocking Bell Called Vox Patris","authors":"D. Bartocha, C. Baron","doi":"10.2478/cqpi-2019-0031","DOIUrl":"https://doi.org/10.2478/cqpi-2019-0031","url":null,"abstract":"Abstract The paper describes the process of melting, metalworking and pouring the form of the world's largest 55-ton rocking bell called Vox Patris. The project was carried out by Pracownia Ludwisarska of Jan Felczyński from Przemyśl in cooperation with Rduch Bells & Clocks from Czernica and Metalodlew SA from Kraków. Comprehensive scientific and technical support of the project was provided by the Department of Foundry of the Silesian University of Technology. The bell is made of bronze, which is an alloy of copper and tin with a content of tin at the level of 20%. The foundry, where the melting and pouring process took place, had two 14 ton electric furnaces, 15 ton transport pouring ladle and a 60 ton collection ladle. Therefore, it was necessary to determine the minimum temperature of the pouring and the conditions for holding the liquid metal so that the metal from the first cast would not solidify before accumulating its total amount (four melts) (Bartocha and Baron, 2015; Bartocha and Baron, 2016). The study presents the tests of alloy properties and a series of computer simulations. Thanks to them the maximum and minimum permissible temperature of metal overheating has been determined (Bartocha, 2017). The final stage of the cast was the mold pouring process. The filling system was responsible for the correct performance of this process. This system comprised a tank (collector) under a doublestopper 60-ton main ladle, an eleven-meter tapping spout, an infusion tank and a downgate. The task of the gating system is uniform and continuous supply of liquid metal to the mold until it is completely filled. The unusual layout, that was used, required checking many factors. Various configurations of the system parameters have been tested based on the series of computer simulations (Czochlarski and Bukowski, 1935; Ignaszak, 1999).","PeriodicalId":251135,"journal":{"name":"Quality Production Improvement - QPI","volume":"69 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131796158","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Corrosion of RC Beams During Time 钢筋混凝土梁在时间中的腐蚀

Quality Production Improvement - QPI Pub Date : 2019-07-01 DOI: 10.2478/cqpi-2019-0042

Y. Blikharskyy, R. Khmil, Z. Blikharskyy

{"title":"Corrosion of RC Beams During Time","authors":"Y. Blikharskyy, R. Khmil, Z. Blikharskyy","doi":"10.2478/cqpi-2019-0042","DOIUrl":"https://doi.org/10.2478/cqpi-2019-0042","url":null,"abstract":"Abstract This article presented results of impact corrosion on reinforce concrete beams during time with previous loading. Before testing the RC beams were loaded by 37% and 75% from bearing-capacity load of undamaged corrosion beams. There were tested two types of beams. First type beams were tested under force loading action and second type beams were tested under force loading and corrosion action. As an aggressive environment were used the 10% solution of sulfuric acid H2SO4. Such environment takes place in separate chemical manufactures, galvanic workshops, flue pipes of thermal power plants. The results of experimental studies have established that the effect of the aggressive environment with simultaneous loading significantly impairs the stress-strain state of reinforced concrete beams. Bearing capacity due to the yielding of reinforcement bars for specimens with the simultaneous action of aggressive environment and previous loading of 37% and 75% takes place on 51…53 and 58…60 days. The destruction of these specimens, by crushing compressive concrete, at previous loading 37% occurred after 75…79 and at previous loading 75% - after 79…88 days. The history loading does not impact significantly on beams failure, on finite deflections and timing exhaustion bearing capacity since the start of the simultaneous action of aggressive environment and loading.","PeriodicalId":251135,"journal":{"name":"Quality Production Improvement - QPI","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134306823","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Eco-Innovation in Municipalities as an Element of Smaller Agglomerations Sustainable Development - Case Study 城市生态创新作为小城市群可持续发展的要素——案例研究

Quality Production Improvement - QPI Pub Date : 2019-07-01 DOI: 10.2478/cqpi-2019-0015

Anna Zelga-Szmidla, K. Kapustka

引用次数: 0

Traceability Systems and Technologies for Better Food Supply Chain Management 改善食品供应链管理的可追溯性系统和技术

Quality Production Improvement - QPI Pub Date : 2019-07-01 DOI: 10.2478/cqpi-2019-0076

Samo Kumperščak, M. Medved, Melanie Terglav, Aleksandra Wrzalik, Matevž Obrecht

引用次数: 9

Carbon Fiber Polymer Composites 碳纤维聚合物复合材料

Quality Production Improvement - QPI Pub Date : 2019-07-01 DOI: 10.2478/cqpi-2019-0037

L. Markovičová, V. Zatkalíková, P. Hanusová

{"title":"Carbon Fiber Polymer Composites","authors":"L. Markovičová, V. Zatkalíková, P. Hanusová","doi":"10.2478/cqpi-2019-0037","DOIUrl":"https://doi.org/10.2478/cqpi-2019-0037","url":null,"abstract":"Abstract Carbon fiber reinforced composite materials offer greater rigidity and strength than any other composites, but are much more expensive than e.g. glass fiber reinforced composite materials. Continuous fibers in polyester give the best properties. The fibers carry mechanical loads, the matrix transfers the loads to the fibers, is ductile and tough, protect the fibers from handling and environmental damage. The working temperature and the processing conditions of the composite depend on the matrix material. Polyesters are the most commonly used matrices because they offer good properties at relatively low cost. The strength of the composite increases along with the fiber-matrix ratio and the fiber orientation parallel to the load direction. The longer the fibers, the more effective the load transfer is. Increasing the thickness of the laminate leads to a reduction in the strength of the composite and the modulus of strength, since the likelihood of the presence of defects increases. The aim of this research is to analyze the change in the mechanical properties of the polymer composite. The polymer composite consists of carbon fibers and epoxy resin. The change in compressive strength in the longitudinal and transverse directions of the fiber orientation was evaluated. At the same time, the influence of the wet environment on the change of mechanical properties of the composite was evaluated.","PeriodicalId":251135,"journal":{"name":"Quality Production Improvement - QPI","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131372443","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

The Quality of Supplied Parts and Their Influence on Manufactured Quality in Serial Production 批量生产中外来件质量及其对成品质量的影响

Quality Production Improvement - QPI Pub Date : 2019-07-01 DOI: 10.2478/cqpi-2019-0069

Milan Dian

引用次数: 1

Quality Improvement of a Gear Transmission by Means of Genetic Algorithm 基于遗传算法的齿轮传动质量改进

Quality Production Improvement - QPI Pub Date : 2019-07-01 DOI: 10.2478/cqpi-2019-0052

P. Lempa, E. Lisowski, Fumito Masui, G. Filo, M. Ptaszynski, M. Domagala, J. Fabis-Domagala

引用次数: 0

Tribological Properties of Oxide Coatings Produced on EN AW-5251 Alloy using Different Distances between Electrodes 不同电极间距对EN AW-5251合金氧化膜摩擦学性能的影响

Quality Production Improvement - QPI Pub Date : 2019-07-01 DOI: 10.2478/cqpi-2019-0054

M. Bara, R. Dwornicka

{"title":"Tribological Properties of Oxide Coatings Produced on EN AW-5251 Alloy using Different Distances between Electrodes","authors":"M. Bara, R. Dwornicka","doi":"10.2478/cqpi-2019-0054","DOIUrl":"https://doi.org/10.2478/cqpi-2019-0054","url":null,"abstract":"\u0000 The subject of the presented work was the analysis of the influence of the distance between the electrodes using in the coating process on the tribological properties of oxide coatings. Oxide coatings were prepared on EN AW-5251 aluminum alloy samples. The samples surfaces were subjected to hard anodizing process in a multicomponent electrolyte based on sulfuric acid with an addition of organic acids. Anodizing was carried out with a constant electric charge density of 180 A·min/dm2. The distances between the electrodes for subsequent samples increased every 0.125 m up to 1 m. The tribological partner in a sliding couple with oxide layers was pin of PEEK/BG. Tribological tests were conducted on a T-17 tester in reciprocating motion, in technically dry friction conditions. Before and after tribological test, examination of the geometrical structure of counter-specimens’ surface was carried out using the Form Talysurf contact profilographometer, via a 3D method. The most satisfactory tribological parameters were obtained for the PEEK/BG association with the coating produced at a distance between the electrodes equal to 0.25 m.","PeriodicalId":251135,"journal":{"name":"Quality Production Improvement - QPI","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128710352","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Weight Minimization of Spatial Trusses with Genetic Algorithm 基于遗传算法的空间桁架重量最小化

Quality Production Improvement - QPI Pub Date : 2019-07-01 DOI: 10.2478/cqpi-2019-0032

M. Grzywiński, J. Selejdak

引用次数: 1