The use of fiber-reinforced plastics has increased significantly in the past decades. Consequently, the demand for finishing and machining of such materials has also escalated. During machining, the fiber-reinforced materials exhibit machining problems dissimilar to the problems of metals. These are fiber pull-out, fiber breakage in the cutting zone, matrix smearing and delamination. The purpose of this experiment is to investigate the characteristics of the resultant force (Fe) dur-ing the milling of carbon fiber reinforced plastic as a function of input machining parameters. For the force measurements, CFR with perpendicular (0°-90°) fiber orientation was machined. The experimental design involved the central composite design method. To analyze and evaluate the measurements, we applied the response surface methodology.

The utilization of fiber reinforced plastics has increased significantly in the past decades. Consequently, the demand for finishing and machining of such materials has also escalated. During machining the fiber reinforced materials exhibit machining problems dissimilar to the problems of metals. These are fiber pull-out, fiber breakage in the cutting zone, matrix smearing and delamination. The purpose of this experiment is to investigate the characteristics of the resultant force (Fe) during milling of carbon fiber reinforced plastic as a function of input machining parameters. For the force measurements CFR with perpendicular (0°-90°) fiber orientation was machined. The experimental design involved the central composite design method. To analyze and evaluate the measurements the response surface methodology was applied.

The purpose of this study is to investigate the applicability of the friction stir welding technology to acrylonitrile butadiene styrene (ABS) type polymer and the effect of welding parameters on the force values and weld strength during he-welding. The tests were carried out on 4 mm thick ABS sheets using a conventional mould design. The input parameters (speed – n, feed rate – vf ) were varied in 3-3 steps and a complete set of experiments was performed. From the force measurements, it was concluded that the force values in the feed direction (Fy) and axial direction (Fz) are the dominant force values during welding. The force components decrease with increasing speed and n/vf ratio, while they increase with increasing feed rate. The tensile strength of the weld improves with increasing speed and n/vf ratio, while they deteriorate with increasing feed rate. The best weld strength (10.69 MPa) was measured at 1000 rpm and 50 mm/min feed rate.

Jelen tanulmány célja, hogy megvizsgáljuk a kavaró dörzshegesztés technológia alkalmazhatóságát akrilnitril-butadién-sztirol (ABS) típusú polimerre, valamint a hegesztési paraméterek hatását a hegesztés során fellépő erőkre és a hegesztési varrat szilárdságára. A vizsgálatokat 4 mm vastag ABS-lemezeken hajtottuk végre, hagyományos szerszámkialakítás mellett. A bemeneti paramétereket (fordulatszám, előtolási sebesség) 3-3 szinten változtattuk, és teljes kísérlettervet hajtottunk végre. Az erőmérésekből azt a következtetést vontuk le, hogy a hegesztés során fellépő erőértékek közül az előtolási irányú erő (Fy) és az axiális irányú erő (Fz) a domináns. A fordulatszám és az előtolási sebesség (n/vf ) arányszáma növelésével csökkennek az erőkomponensek, míg az előtolási sebesség növekedésével nőnek. A varrat szakítószilárdsága a fordulatszám és az n/vf arányszám növelésével javul, míg az előtolási sebesség növelésével romlik. A legjobb varratszilárdságot (10,69 MPa) 1000 1/perc fordulatszámon és 50 mm/perc előtolási sebességnél mértük.