Abstract
This paper reports on the potential use of geopolymer in the drilling process, with respect to tool wear and surface roughness. The objectives of this research are to analyze the tool life of three different economy-grade drill bit uncoated; high-speed steel (HSS), HSS coated with TiN (HSS-TiN), and HSS-cobalt (HSS-Co) in the drilling of geopolymer and to investigate the effect of spindle speed towards the tool life and surface roughness. It was found that, based on the range of parameters set in this experiment, the spindle speed is directly proportional to the tool wear and inversely proportional to surface roughness. It was also observed that HSS-Co produced the lowest value of surface roughness compared to HSS-TiN and uncoated HSS and therefore is the most favorable tool to be used for drilling the material. For HSS, HSS coated with TiN, and HSS-Co, only the drilling with the spindle speed of 100 rpm was able to drill 15 holes without surpassing the maximum tool wear of 0.10 mm. HSS-Co exhibits the greatest tool life by showing the lowest value of flank wear and produce a better surface finish to the sample by a low value of surface roughness value (Ra). This finding explains that geopolymer is possible to be drilled, and therefore, ranges of cutting tools and parameters suggested can be a guideline for researchers and manufacturers to drill geopolymer for further applications.
Highlights
The use of environmentally friendly materials has been increasing across the globe because it helps reduce waste, minimize pollution, and save energy
The data were tabulated into graphs, as shown using high-speed steel (HSS), HSS coated with TiN (HSS-TiN), and HSS-Co
Is that Increasing fly ash geopolymer machinable using drilling resulting in an increase in the temperature at the contact region
Summary
The use of environmentally friendly materials has been increasing across the globe because it helps reduce waste, minimize pollution, and save energy. Geopolymer, for instance, is one of the green materials and has been highly demanded in numerous applications, in construction materials, to replace ordinary cement [1]. The interest in these materials has been increasing due to the manufacturing of this material that involves a very low rate of greenhouse gas emission [2,3]. Apart from that, geopolymer utilizes waste materials such as recycled concrete and unwanted fly ash This material has interesting properties because it is very durable and stable at high temperature; this property has been one of the reasons why geopolymer materials are widely used in many sectors, especially in the engineering sector such as civil construction, automotive industry, and aviation sector [2,3,4,5]. From the manufacturing point of view, one of the ways of producing materials in various forms and shapes can be achieved through machining processes [8]
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