Browsing by Author "Hagedorn-Hansen, D."
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- ItemCharacteristics of single layer selective laser melted tool grade cemented tungsten carbide(Stellenbosch University. Faculty of Engineering. Dept. of Industrial Engineering., 2016) Van Staden, A. C.; Hagedorn-Hansen, D.; Oosthuizen, G. A.; Sacks, N.Cemented carbide tools, specifically tungsten carbide based alloys, have found a wide range of application fields including manufacturing, agriculture, and mining, among others. A need for customised tooling solutions using cemented carbide alloys have been identified. Additive manufacturing is chosen as a novel manufacturing process due to its superior material and process flexibility. The study investigates the melting behaviour observable during the SLM process using a tool grade cemented tungsten carbide powder. The laser power, scan velocity, and hatch spacing of the SLM process are varied and single powder layers are sintered accordingly. This is done to determine the varying influence these parameter combinations have on the melting behaviour of the material during sintering. For each set of parameter combinations the test samples were analysed using microscopic imaging. It is found that a combination of high laser power, high hatch spacing, and low scan speed yields the best results.
- ItemThe effects of selective laser melting scan strategies on deviation of hybrid parts(Southern African Institute for Industrial Engineering, 2017-11-22) Hagedorn-Hansen, D.; Bezuidenhout, M. B.; Dimitrov, D. M.; Oosthuizen, G. A.ENGLISH ABSTRACT: The use of additive manufacturing to produce intricate part geometries in the aerospace, medical, and tool-and-die industries is increasingly incorporated in manufacturing process chains. However, the high costs, long production times, and material integrity issues associated with additive manufacturing technologies such as selective laser melting make the process suitable only for certain applications. In order to reduce selective laser melting production costs for selected parts, a combination of selective laser melting and milling can be used. Metal parts produced with this method are referred to as hybrid parts. A challenge in producing hybrid parts is to reduce the geometrical deviation due to process-induced warping. This paper discusses the effects of various laser scan strategies on the deviation of hybrid parts. A newly developed scan strategy is experimentally compared with its commercial counterpart with regard to as-built part warping and porosity. The novel strategy resulted in a significant reduction in warping and porosity.
- ItemInvestigating the effects of automating process chains towards sustainable manufacturing in South Africa(Elsevier, 2017) Hagedorn-Hansen, D.; Steenkamp, L. P.; Hagedorn-Hansen, E.; Oosthuizen, G. A.ENGLISH ABSTRACT: Automation of processes is becoming increasingly popular within manufacturing. However, in third world countries such as South Africa, automation could lead to the loss of jobs and even higher unemployment. In order to remain globally and locally competitive, companies need to invest in new technologies of which automation is a highly influential aspect. Thus a study is deployed to determine when a company should automate a process and when a semi-automated process is sufficient in the process chain. To ensure a close to optimum operation, a balance between workforce skill development and profit needs to be determined. In this study, the effects of automating process chains were evaluated. A semi-automated process chain that included a manual labor aspect was used to manufacture small aluminium automotive components and was compared to an automated process with regards to machine effectiveness and labor resources. The automated process derived a higher profit margin due to the high availability of the machine and the lower labour costs. Suggestions were given to increase the profit margin without the loss of labour.
- ItemVisual management system to manage manufacturing resources(Elsevier, 2017) Steenkamp, L. P.; Hagedorn-Hansen, D.; Oosthuizen, G. A.The next generation of manufacturing will be focused of utilizing lean tools within production industries. Internet of Things (IoT) has made its progress evolvement into the manufacturing industry and has led to improved control when implemented to monitor manufacturing resources. Smart production systems can integrate the virtual and physical worlds and accomplish improved transparency of production processes. These smart production systems will go beyond the traditional means of collaboration to move companies from good to great. In this study a visual management system was developed for resource management research for the Stellenbosch Technology Centre's Laboratory for Advanced Manufacturing (STC-LAM). This system gathers shop floor data and display it in a dashboard. Results and future work was also discussed.
- ItemWaste to resource process chain strategies for global manufacturers(Elsevier, 2017) Durr, J. F. W.; Hagedorn-Hansen, D.; Oosthuizen, G. A.ENGLISH ABSRACT: In order for suppliers to stay competitive in the global market, innovative and resource efficient process chains need to be a part of their manufacturing strategies. In this study the effect of different waste to resource process chain strategies were evaluated. The objective was to transform the material waste from a cutting process into a resource. The metal chips were collected and the effect of lubrication and briquette forming strategies on value were investigated. The effects on cost and quality were evaluated and the influence on factory planning assessed. The value of the briquette increased with a reduction in lubricant during the cutting process and by compacting the metal chips.