Lic.-avh. Uppsala : Univ.

<p>This master thesis is Atlas Copco Craelius’ first step in incorporating numericalmethods in load case analysis during the development process. Atlas Copco needs toconstantly evolve and refine their methods in the design process to remain as thenumber one manufacturer of mining and construction equipment. Poor knowledge ofloads results either in structural failures or in oversized structures, both very costlyfor Atlas Copco.The main goal of this thesis is to examine the potential in MBS software by using it toidentify extreme load cases in one of Atlas Copco Craelius’ surface drill rigs, Mustang5. The MBS-software ADAMS View is used to build a model of the Mustang 5 drill rigand evaluate simulation results. The rig model is subject to motions which representreal case scenarios. The feed positioning possibilities are examined thoroughly since it was expected that the positioning has impact on the load levels. 25 different feedpositioning are simulated.The main conclusion is that the load levels are highly dependent on the feedpositioning. For example, the load levels in the boom raising cylinder can increaseseven times, if the rig is operated with the most unfavorable positioning compared tothe recommended. It could also be concluded that not only one positioning isextreme in terms of loads; it depends on which part of the boom system is beingobserved. Thus, several positioning cases have to be taken into consideration in orderto optimize the design of parts in the boom system.</p>

This master thesis is Atlas Copco Craelius’ first step in incorporating numericalmethods in load case analysis during the development process. Atlas Copco needs toconstantly evolve and refine their methods in the design process to remain as thenumber one manufacturer of mining and construction equipment. Poor knowledge ofloads results either in structural failures or in oversized structures, both very costlyfor Atlas Copco.The main goal of this thesis is to examine the potential in MBS software by using it toidentify extreme load cases in one of Atlas Copco Craelius’ surface drill rigs, Mustang5. The MBS-software ADAMS View is used to build a model of the Mustang 5 drill rigand evaluate simulation results. The rig model is subject to motions which representreal case scenarios. The feed positioning possibilities are examined thoroughly since it was expected that the positioning has impact on the load levels. 25 different feedpositioning are simulated.The main conclusion is that the load levels are highly dependent on the feedpositioning. For example, the load levels in the boom raising cylinder can increaseseven times, if the rig is operated with the most unfavorable positioning compared tothe recommended. It could also be concluded that not only one positioning isextreme in terms of loads; it depends on which part of the boom system is beingobserved. Thus, several positioning cases have to be taken into consideration in orderto optimize the design of parts in the boom system.

This research has been done on a mission from Atlas Copco Secoroc AB, DTH department. The focus and purpose of the study is to acknowledge the important factors you need to take advantage of when it comes to offering bundles. There is also a theoretical purpose, which is to investigate if communication together with bundles can create loyalty and, how this three factors affect each other. This is a somewhat overlooked research area within the bundles theory and is therefore of keen interest for this case. The research has been conducted through seven in-depth interviews with people related to Atlas Copco Secoroc and the sell-buy transactions.  The interviewed people were customers, sales persons, service technician, distributions co-ordinator and price department personnel. There was also investigative quantitative research done, where nineteen customer centres were asked to reveal competitor’s customers net price on different products. The interviews could not have been conducted without a literature review done within the subjects of bundles, communication, loyalty and price strategies. These four topics together with how the order works and the contact between different instances worked as the base for the interviews. The literature review plus learned information on Secoroc was the basis of the knowledge needed to conduct the interviews. The key factors found in the research that Secoroc needs to take advantage of are communication within the company, and with the customer and also the importance of relationship building. This is something a majority of the interviewed persons believe is missing, or hard to have time for, and something that theory puts a lot of pressure on. Better communication will lead to easier sales, better relationships and through that, increased loyalty. It will facilitate the sales of bundles and the communication will help in the creation of bundles. The findings include a suggestion where the mission is to involve Secoroc deeper with their customers. The findings suggested that a reason for the missing contact is because lack of resources. Therefore the solution is to employee service technicians in high-loaded areas. Through that a more regular and close contact will be established. Customers can concentrate on the drilling and Atlas Copco Secoroc will take care of the administrative work. Further research has to be done within subject of how to divide the invoice when more then one product company is involved in the bundle. Connected to this is how the reward should be divided between involved sales persons. A redevelopment of the system is needed and therefore more knowledge and research over how that can be accomplished must be acquired.

The component workshop at Atlas Copco inTierp intends to reduce the costs inorder to increase their competitiveness.This thesis examines how the productionmanagement around cylinder washersshould be managed in a way that meetsthe customer needs. The customer to thecylinder washer is Atlas Copcos assemblydepartment in Tierp. The purpose of this thesis is to providean alternative way of managing theproduction. A chapter of theory is addedto give the reader an insight ofdifferent types of production managementsystems as well as the underlyingknowledge needed to get a better readingexperience. An introduction of kanbancan in theory help Atlas Copco in thedirection they strive. It should beclear how the purpose of this thesisaffects the cost for the componentworkshop and also how it relates to thecurrent production. The currentsituation is described by explaining howthey use SAP, EOQ and an analysis of how EOQ determine the batch size. Thencalculations on a kanban system is madeand also an idea of how the logistics ofthe kanban system should be managed. From this thesis, conclusions how animplementation of a kanbansystem wouldaffect the component workshop can beshown. By using the overcapacity withthe machine to increase the frequency ofchangeovers leads to reduced batch size.The reduced batch starts a chain of goodconsequences like reduction ofinventory. Changing from a productionmanaged by EOQ to a kanbanflow makes theproduction planning more transparent andrequire less resources. In a complexprocess there’s a lot of factors thatdetermine how the production is managed,a kanbansystem reduce the complexitywith an easy signal when the productionshould start. / Komponentverkstaden på Atlas Copco i Tierp har för avsikt att minska de kostnadsdrivandefaktorerna för att öka sin konkurrenskraft. Den här rapporten undersöker hur cylinderbrickorska produktionsstyras på ett sätt som tillgodoser cylinderbrickans kund (monteringen)samtidigt som lagernivåer inte ska vara för stora. Målet med rapporten är att ge komponentverkstaden i Tierp ett förslag om ett alternativttillvägagångssätt för att styra produktionen. Ett kapitel med teori finns för att ge läsaren eninblick i olika typer av produktionsledningssystem samt omkringliggande kunskaper sombehövs för att få en bättre läsupplevelse. Ett införande av kanbansystem anses i teorin kunnahjälpa Atlas Copco i den riktning de önskar. Det ska tydligt framgå hur alternativet påverkarde kostnadsdrivande faktorer samt hur det förhåller sig till nuvarande produktionsstyrning.Nuläget beskrivs genom att förklara hur de använder SAP och EOQ samt en analys av attutforma partistorlekar med hjälp av EOQ. Därefter räknas ett kanbansystem fram och en idéom hur logistiken kring kanbansystemet ska skötas. Från den här rapporten kan slutsatser dras om hur en implementering av ett kanbansystemskulle påverka komponentverkstaden. Genom att använda den överblivna tiden som finns vidmaskinen till att ställa om produktionen oftare, minskar partistorlekarna vilket startar enkedjereaktion av bra konsekvenser som till exempel mindre lager. Att gå ifrån en EOQ styrdproduktionsstyrning till ett kanbanflöde gör att produktionsplaneringen blir merlättöverskådlig och mindre resurskrävande. I en komplex process där en oöverskådlig mängdfaktorer styr hur produktionen ska planeras minskas komplexiteten med hjälp av ettkanbanstyrt flöde som ger signal om produktion efter förbrukning.

Framtagning av monteringverktyg för stiftning av borrkronor.

<p>This master thesis consists of the creation of shock absorber models for percussive rock drills. A model of the rock was also developed. These models were connected to existing models of the rock drill to create a complete simulation of the rock drilling process.</p><p>When the models had been created the rock model was evaluated by comparison with measured values from lab tests. The verified rock model was then used to evaluate the shock absorber models.</p><p>Four new shock absorber concepts have been developed. Three of these have been modelled, while the fourth have only been sketched and described.</p><p>The evaluation of the models showed the following:</p><p>• Simulations of the single shock absorber don’t correlate to reality very well. The movement is too rapid and poorly damped.</p><p>• The simulated behaviour of the tandem shock absorber corresponds to reality, but the simulated hydraulic pressures aren’t reliable and neither is the damping.</p><p>• Simulation of the double shock absorber reflects reality fairly well, although the model of the check valve can be improved.</p><p>• There are problems with fluttering damper pressures in simulation whenever an accumulator is connected directly to the damper volume. The problem doesn’t exist if there is a line or an orifice with enough losses between the volume and the accumulator.</p><p>• The feeder system needs to be modelled.</p> / <p>Examensarbetet gick ut på att ta fram simuleringsmodeller av olika dämpare i en bergborrmaskin. Dessutom behövdes en bergmodell som gav korrekta reflexer från berget vid simulering. Dessa modeller kopplades samman med befintliga modeller för att skapa en simulering av hela bergborrningsprocessen.</p><p>Efter att modeller skapats utvärderades bergmodellen mot mätvärden som uppmätts under prov. Efter att bergmodellen verifierats användes den för att verifiera dämparmodellerna.</p><p>Fyra dämparkoncept har tagits fram. Tre av dessa har modellerats, medan det fjärde endast har skissats och förklarats.</p><p>Verifieringen av modellerna visade följande:</p><p>• Simulering av enkeldämpare stämmer dåligt med verkligheten utan ger för snabba och odämpade rörelser.</p><p>• Simulering av dubbeldämparen stämmer bra med verkligheten men modellen över backventilen behöver ses över något.</p><p>• Simulering av tandemdämpare stämmer beteendemässigt men de simulerade trycken är inte tillförlitliga och inte heller dämpningen.</p><p>• Det finns problem med trycksvängningar vid simulering av modeller där dämpvolymen är direkt ansluten till en ackumulator. Om en strypning eller en ledning med tillräckliga förluster ansluter ackumulator och dämpvolym med varandra märks inte detta problem.</p><p>• Modell över matningen behöver tas fram.</p>

This master thesis consists of the creation of shock absorber models for percussive rock drills. A model of the rock was also developed. These models were connected to existing models of the rock drill to create a complete simulation of the rock drilling process. When the models had been created the rock model was evaluated by comparison with measured values from lab tests. The verified rock model was then used to evaluate the shock absorber models. Four new shock absorber concepts have been developed. Three of these have been modelled, while the fourth have only been sketched and described. The evaluation of the models showed the following: • Simulations of the single shock absorber don’t correlate to reality very well. The movement is too rapid and poorly damped. • The simulated behaviour of the tandem shock absorber corresponds to reality, but the simulated hydraulic pressures aren’t reliable and neither is the damping. • Simulation of the double shock absorber reflects reality fairly well, although the model of the check valve can be improved. • There are problems with fluttering damper pressures in simulation whenever an accumulator is connected directly to the damper volume. The problem doesn’t exist if there is a line or an orifice with enough losses between the volume and the accumulator. • The feeder system needs to be modelled. / Examensarbetet gick ut på att ta fram simuleringsmodeller av olika dämpare i en bergborrmaskin. Dessutom behövdes en bergmodell som gav korrekta reflexer från berget vid simulering. Dessa modeller kopplades samman med befintliga modeller för att skapa en simulering av hela bergborrningsprocessen. Efter att modeller skapats utvärderades bergmodellen mot mätvärden som uppmätts under prov. Efter att bergmodellen verifierats användes den för att verifiera dämparmodellerna. Fyra dämparkoncept har tagits fram. Tre av dessa har modellerats, medan det fjärde endast har skissats och förklarats. Verifieringen av modellerna visade följande: • Simulering av enkeldämpare stämmer dåligt med verkligheten utan ger för snabba och odämpade rörelser. • Simulering av dubbeldämparen stämmer bra med verkligheten men modellen över backventilen behöver ses över något. • Simulering av tandemdämpare stämmer beteendemässigt men de simulerade trycken är inte tillförlitliga och inte heller dämpningen. • Det finns problem med trycksvängningar vid simulering av modeller där dämpvolymen är direkt ansluten till en ackumulator. Om en strypning eller en ledning med tillräckliga förluster ansluter ackumulator och dämpvolym med varandra märks inte detta problem. • Modell över matningen behöver tas fram.

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