Browsing by Author "Al Shaalane, A."
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- ItemEvaluation of robot technologies for deep level mining applications(Stellenbosch : Stellenbosch University, Department of Industrial Engineering, 2011-09) Louw, S. E.; Oosthuizen, G. A.; Al Shaalane, A.Mining starts with the extraction of effortless resources, but quickly progresses to more complex situations. As the mining depth increase the technical challenges and difficulty to retrieve resources rises. The future deep-level mining environment is considered too immense a risk for human labour. Therefore, robot technology is considered as an alternative. This imposes the need to develop and improve current mining technology and equipment. This study evaluates robot technologies for deep level mining applications. Firstly, the constraints of robots associated in deep-level mining environments are identified. Thereafter, various existing robot technologies are analyzed to categorize functional attributes of each robot. These were assessed with regard to the constraints, establishing a basis for selection of a feasible robot technology platform. Recommendations are made on how to improve the existing robot technology to compensate for specific conditions. It is concluded that it is vital to improve existing robot technologies in order to mine at deeper levels. In collaboration with technology- and mining companies a mechanized mining concept was developed from these evaluations.
- ItemEvaluation of work piece temperature measurement techniques for milling of Ti6Al4V(Stellenbosch : Stellenbosch University, Department of Industrial Engineering, 2011-09) Conradie, P. J. T.; Oosthuizen, G. A.; Treurnicht, N. F.; Al Shaalane, A.Ti6Al4V is one of the most widely used titanium alloys in aerospace applications, but its machining remains a challenge. This is partly due to the lack of understanding of the thermal- and mechanical constraints during milling. Extensive research has been done in the past investigating catastrophic tool failure of various tool materials. However, not much research has been done to investigate the cause of work piece failure. The catastrophic effect of overheating the work piece and the resulting alpha case formation in titanium is well known. Current techniques of temperature measurement of the machined surface can be divided into two categories: contact- and optical methods. In this study these temperature measurement techniques were studied and evaluated. The response time of contact methods are found to be to relatively slow. The optical methods have the advantage of immediate response, allowing capture of intermittent heat generation as required in milling. The infrared camera temperature measurement experiments were conducted with a special setup in order to have a good visual of the temperature flow. The results of these experiments were found to correspond with literature.
- ItemOverview of work piece temperature measurement techniques for machining of Ti6Al4V(Southern African Institute for Industrial Engineering, 2012-07) Conradie, P. J. T.; Oosthuizen, G. A.; Treurnicht, N. F.; Al Shaalane, A.ENGLISH ABSTRACT: Ti6Al4V is one of the most widely used titanium alloys in aerospace applications, but its machining remains a challenge. Comprehensive research has been done in the past, mainly investigating tool failure of various materials. Less research has been done to investigate the thermal effect of machining on work piece quality, including fatigue performance. Temperature measurement is considered to be a key enabling technology. This study presents an overview of current temperature measurement techniques for machined and tool surfaces. Two categories of methods were investigated: slower contact, and faster optical methods. Optical fibre two colour pyrometry experiments are reported that demonstrate the technique’s adequate response time. The infrared camera temperature measurement experiments synchronised temperature measurement with visual observation, aimed at mechanism analysis. The results corresponded with the literature.