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Tampere, Finland

Lindroos M.,Tampere University of Technology | Kuokkala V.-T.,Tampere University of Technology | Lehtovaara A.,Tampere University of Technology | Kivikyto-Reponen P.,Metso Minerals Oy
Key Engineering Materials | Year: 2012

An abrasive wear analysis of the hardened surface layer in high austenitic manganese steel is presented to determine the effects of plastic strain and strain rate. The pre-deformation levels used in this study represent the typical surface layers resulting from the abrasive contact of Hadfield type steels. The effect of dynamic loading used in the pre-straining is accounted for alongside with various plastic strain levels. A friction study of the surface was included to determine the localization of work hardening and the ability of the microstructure to resist abrasion. © (2013) Trans Tech Publications. Source

Linjamaa A.,Tampere University of Technology | Lehtovaara A.,Tampere University of Technology | Kallio M.,Metso Minerals Oy | Sochting S.,Wartsila Finland Oy
Key Engineering Materials | Year: 2016

Journal bearings are widely used in heavy industry and in internal combustion engine applications. There is a need to increase the power density of various machine parts which leads to increased bearing loads and reduced lubrication film thicknesses. This type of development may increase deformations on the bearing surfaces which need to be considered in the bearing design process. The main purpose of this work was to develop a parameterized calculation model for hydrodynamic radial journal bearings which takes into account elastic and thermal deformations of the bearing surfaces. Hydrodynamic calculations were based on the numerical solving of the Reynolds equation by assuming rigid surfaces. Elastic and thermal deformations of the bearing and shaft surfaces were calculated by using the finite element method. It is concluded that elastic and thermal deformations are partly canceling each other out at the loaded side of the bearing and depending on the sliding speed and the external normal force either one of them could be more significant. © 2016 Trans Tech Publications, Switzerland. Source

Cepuritis R.,Norwegian University of Science and Technology | Cepuritis R.,Norcem AS HeidelbergCement | Jacobsen S.,Norwegian University of Science and Technology | Onnela T.,Metso Minerals Oy
Minerals Engineering | Year: 2015

Crushed sand fines have a pronounced effect on fresh concrete rheological properties, which can be controlled through a concrete micro-proportioning approach, i.e. optimisation of the particle size distribution (PSD) in the very fine range of the grading (≤250 μm). The paper describes a study where possibilities of producing crushed sand by combining high-speed (70 m/s) vertical shaft impact (VSI) crushing and static air classification are explored to enable the micro-proportioning approach in full-scale aggregate and concrete production. In addition, the effect of rock resistance to fragmentation (crushability) on the shape improvement and fines generation during high-speed VSI crushing is experimentally studied. The VSI crushing experiment results show that an acceptable level of crushed sand particle (1.25-8 mm) equi-dimensionality (flakiness index lower than 5-8%) can be achieved for all processed feeds, regardless of the parent rock crushability or initial particle shape. The amount of fines smaller than 63 μm and 125 μm generated during high-speed VSI crushing is very strongly governed by the resistance to fragmentation of the processed rock materials. Analysis of the air classification results show possibilities of modelling a variety of different crushed sand fine particle (≤250 μm) grading curves independently of the rock type, amount of fines or grading of the crushed sand product after the VSI crushing. © 2015 Elsevier Ltd. All rights reserved. Source

Agency: Cordis | Branch: FP7 | Program: CP-IP | Phase: NMP-2007-3.1-1 | Award Amount: 9.65M | Year: 2009

Manual work is a crucial and expensive component of manufacturing. Globalization causes companies to reduce manual work costs by offshoring and global outsourcing. This poses problems such as increased lead times, lower quality products and services, and weaker management. Because of the pressure of globalization and the decline of the working age population in Europe, the situation will get worse in sectors with a large proportion of high value manual work that cannot be automated or outsourced. The ManuVAR project aims to provide a timely and systematic solution to this problem. The objective of ManuVAR is to develop an innovative technology platform and a framework to support high value manual work throughout the product lifecycle. ManuVAR will cover ergonomics, safety, work assistance, and training. It includes various people from designers to factory workers, operators, maintenance personnel, and end-users. The aims of ManuVAR are to: (1) increase productivity and quality, reducing the cost of high value manual work at every stage of the lifecycle; (2) facilitate adaptation to product customization and changes; (3) support efficient knowledge and skill management; (4) improve EU industry competitiveness via knowledge-based business models. This will be achieved by employing virtual reality technology to facilitate communication between people and systems. It will also enable the two-way flow of knowledge and its accumulation and reuse throughout the entire lifecycle and across subsequent system generations. The consortium comprises 18 partners representing industry, research and academia. In ManuVAR, there are five synergistic application clusters in different industrial areas: terrestrial satellite assembly, assembly line design, remote maintenance of trains, maintenance of nuclear reactors, large machine assembly process design. ManuVAR will demonstrate that high value, high knowledge manual work is an opportunity to improve the competitiveness of EU industries.

Metso Minerals Oy | Date: 2007-10-09

Machinery for processing rocks and minerals and similar solid materials, stationary, portable or self propelled minerals handling equipment, machinery for particle size reduction of minerals and similar solid materials, apparatus and equipment used in minerals and ore comminution, grinding and crushing processes, namely, crushers, crushing plants, breakers, grinding mills, ball mills, cone mills, rod mills, detritors, classifiers, agitators, flotation machines, thickeners, clarifiers, settlers, filters, presses, thermal processors, rotary kilns, balling drums, fluid beds, dryers, coolers, fairleads, panama chockes, winches, windlasses, pelletizers, sinters, pullers, slurry pumps; disintegrators, screening devices, screens, shakeouts, cyclones, separators, scalpers, feeders, mobile feeders; machinery and equipment for separating solids from solids, namely screens, screen grates, screen cloths, scalpers, cyclones, washers, magnetic separators, vibrating separators; filtering devices, namely, filter casings and boxes, filter frames and supports, filter pumps; machinery and equipment for dust encapsulation and extraction, namely, dust covers and sealings, hosings, spray nozzles, exhausters, extractors, suction fans, vacuums; machinery and equipment for tooling of minerals and similar solid materials, namely, floor saws, stone saws, stone mills, stone grinders; drilling machinery and equipment, namely, rock drills, tunneling drills; equipment and materials for recycling mineral materials, namely recycling crushers, recycling conveyors, magnetic separators, metal indicators; machinery and equipment for transport of minerals and aggregate materials, namely, transport and feed apparatus, conveyors, reclaimers, feeders, vibrating chutes, loaders, grab unloaders, stackers, stockpilers, dumpers; mining machinery, namely mine drills and mine hoists; machinery and equipment for paving and compaction, namely, planers, payers, screeds, rollers, duplex rollers, plate compactors, trench compactors, trampers, poker vibrators, vibrating beams, modular screeds, floor saws, grinding machines, power trowels, external vibrators, submersible pumps, suction mats; machinery and equipment for recycling metal materials, namely, shearers, shredders, presses, car squeezers; parts and fittings for all the above machines, apparatus and equipment, namely, screen cloths, grizzlies, filters, conveyor belts, scrapers, vibrators, exciters, cutting edges, liners; wear protection equipment, namely, wear plates, linings, sheetings, panels spray nozzles, elastomers, dust sealers, hoses, couplings, gaskets, slurry bends. Installation, erection, maintenance, repair and rental of machines and equipment for use in processing of rocks and minerals and similar solid materials and their parts; installation, erection, maintenance, repair and rental of machines and equipment for use in metals or mineral materials recycling and their parts; advisory services relating to the installation, maintenance and operation of such machines and equipment. Assembly for others of machines and equipment for use in processing of rocks and minerals and similar solid materials and their parts; assembly for others of machines and equipment for use in metals or mineral materials recycling and their parts.

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