This paper focused on the maintenance or repair of holes made using hybrid Mg-Al-Mg components by drilling, using two sustainable cooling techniques (dry machining and cold compressed air) and taking surface roughness on the inside of the holes as the response variable. The novelty of the work is in proving that the repair operations of the multi-material components (magnesium-aluminum-magnesium) and the parts made of aluminum and magnesium (separately) but assembled to form a higher component can be done simultaneously, thus reducing the time and cost of the assembly and disassembly of this type of component. The study is based on a design of experiments (DOE) defined as a product of a full factorial 23 and a block of two factors (3 × 2). Based on our findings, we propose that the analyzed operations are feasible under sustainable conditions and, in particular, under dry machining. Also, the results depend on the machining order.
Keywords: Ra; Rz; aluminum; arithmetical mean roughness; average maximum height; cold compressed air; drilling; dry machining; hybrid components; light alloys; lubrication and cooling systems; magnesium; repair and maintenance operations.