نوع مقاله : مقاله پژوهشی
عنوان مقاله English
نویسندگان English
Fiber Metal Laminates (FMLs), which combine the superior properties of metallic and polymeric composite materials, have emerged as innovative materials widely utilized in aerospace and automotive industries. Despite their advantages, the drilling process of these structures, particularly in curved components, is associated with challenges such as delamination, deteriorated surface quality, and increased machining forces. The present study aims to investigate the influence of three critical drilling parameters-spindle speed, feed rate, and drill diameter-on fiber delamination, hole quality, and drilling force in curved aluminum/polypropylene sheets reinforced with glass fibers. For sample fabrication, layers of 3105 aluminum and glass fiber-reinforced polypropylene were shaped using a hot press technique and an Ohio-shaped mold. Experiments were conducted based on a full factorial design, with spindle speeds of 1000, 2000, and 2500 rpm, feed rates of 8, 16, and 25 mm/min, and drill diameters of 3, 5, and 7 mm. Results indicated that the maximum fiber delamination (0.243 mm) occurred under conditions using a 3 mm drill bit, 1000 rpm spindle speed, and 8 mm/min feed rate, whereas the minimum delamination (0.090 mm) was observed with a 7 mm drill bit under the same conditions. Surface quality analysis revealed that lower spindle speeds and feed rates produced more regular holes with sharper edges. Furthermore, an increase in spindle speed resulted in a reduction of drilling force, while an elevated feed rate exhibited an opposing effect. The drill diameter demonstrated a dual impact on force, initially increasing it and subsequently decreasing it due to reduced unit pressure. Collectively, the findings underscore the significance of optimizing drilling parameters to enhance quality and minimize damage in curved FMLs.
کلیدواژهها English
