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Bu çalışmada, AISI H11 sıcak iş takım çeliğinin tornalanmasında kriyojenik işlemin kesici takım performansı üzerine etkileri araştırılmıştır. Deneylerde TiAlN+TiN kaplı tungsten karbür takımlar kullanılmıştır. Kesici takımlar üzerine 6 saat süre ile -80 °C’de sığ kriyojenik işlem (SCT6), 6 saat süre ile -196 °C’de derin kriyojenik işlem (DCT6) ve 24 saat süre ile -196 °C’de derin kriyojenik işlem (DCT24) uygulanmıştır. Tornalama deneyleri 0,6 mm kesme derinliği, 0,18 mm/dev ilerleme hızı ve 320, 360, 400 ve 440 m/dak olmak üzere dört farklı kesme hızında gerçekleştirilmiştir. Deneysel sonuçlar kriyojenik işlemin kesici takımın aşınma direncini artırdığını göstermiştir. En düşük kesici takım aşınması ve yüzey pürüzlülüğü değerleri DCT24 takımla elde edilmiştir. Yanak aşınmasında %13-28 oranlarda, yüzey pürüzlülüğünde ise %7-14 oranlarda iyileşmeler gözlenmiştir. Diğer yandan kriyojenik işlemin kesici takımların sertliğinde %4,4-8,7 oranlarda artış sağladığı tespit edilmiştir. En yüksek sertlik artışı da DCT24 takımda meydana gelmiştir.
In this study, the effects of the cryogenic process on the cutting team performance in the turning of the AISI H11 hot work cluster steel were studied. In the experiments, TiAlN+TiN-covered tungsten carbure teams were used. The cutting equipment has been applied a thick cryogenic process at -80 °C for 6 hours, a thick cryogenic process at -196 °C for 6 hours, and a thick cryogenic process at -196 °C for 24 hours (DCT24). Tornating experiments were conducted at four different cutting speeds: 0.6 mm cutting depth, 0.18 mm/div progress speed and 320, 360, 400 and 440 m/min. Experimental results have shown that the cryogenic process increases the stretching resistance of the cutting team. The lowest cutting assembly stretching and surface smoothness values are obtained with the DCT24 assembly. Healing was observed at 13-28 percent in the heating rate and 7-14 percent in the surface smoothness. On the other hand, the cryogenic process has been found to increase the hardness of cutting teams by 4.4-8.7%. The highest hardness increase also occurred in the DCT24 team.
In this study, the effects of cryogenic treatment on cutting tool performance in turning of AISI H11 hot work tool steel were investigated. In experiments, TiAlN+TiN coated tungsten carbide tools were used. Shallow cryogenic treatment for 6 hours at -80 °C (SCT6), deep cryogenic process at -196 °C for 6 hours (DCT6) and deep cryogenic treatment at -196 °C for 24 hours (DCT24) was applied. Turning experiments were carried out with constant cutting depth (0.6 mm) and feed rate (0.18 mm/rev) and four different cutting speeds (320, 360, 400 and 440 m/min). Experimental results showed that the cryogenic treatment increases the abrasion resistance of the cutting tool. The lowest cutting tool wear and surface roughness values were obtained with DCT24 tool. Improvements in flank wear were observed at 13-28%, and surface roughness at 7-14%. On the other hand, it was determined that the cryogenic process provides an increase of 4.4-8.7% in the hardness of the cutting tools. The highest hardness increase has also occurred in the DCT24 tool.
Field : Fen Bilimleri ve Matematik
Journal Type : Ulusal
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