Determining of the Optimal Turning Parameters Using the Response Surface Methodology in Powder Metallurgical Tool Steel

Öz

The influence of cutting parameters on the surface roughness in turning of PMD 23 powder metallurgical (PM) steel was investigated in this work.  With three different cutting speeds, feed rates, depth of cuts and two different types tool geometry of carbide inserts were determined as cutting parameters Taguchi L₁₈ orthogonal array was used to design of experiment. In order to find out the effect of cutting parameters on the average surface roughness (R_a) and prediction model of R_a, response surface method (RSM) was used. The results obtained by RSM revealed that the feed rate was dominant parameter on changes in R_a. The developed predicting model of R_a can be effectively used on PMD 23 PM steel within 95% confidence intervals ranges according to the experimental parameters.

Anahtar Kelimeler

• Hard Turning
• Surface roughness
• Response surface method

Toz Metalurjisi Takım Çeliklerinde Cevap Yüzey Metodu Kullanarak Optimum Tornalama Parametrelerinin Belirlenmesi

Öz

Bu çalışmada PMD 23 Toz Metalürjisi (TM) çeliğin tornalanmasında kesme parametrelerinin yüzey pürüzlülüğü üzerindeki etkileri araştırılmıştır. Üç farklı kesme hızı, ilerleme oranı, kesme derinliği ve iki farklı takım geometrili karbür uç tipi kesme parametreleri olarak belirlenmiştir. Deney tasarımı için Taguchi L18ortogonal dizi kullanılmıştır. Kesme parametrelerinin ortalama yüzey pürüzlülüğü (Ra) ve Ra 'nın tahmin modeli üzerindeki etkisini belirlemek için cevap yüzey yöntemi (RSM) kullanılmıştır. RSM ile elde edilen sonuçlar, ilerleme oranının Ra’nın değişimi üzerinde etkin bir parametre olduğunu ortaya çıkarmıştır. Ra için geliştirilen tahmin modeli, deneysel parametrelere göre PMD 23 PM çelik için etkin bir şekilde %95 güven aralığı içinde kullanılabilir. Minimum yüzey pürüzlülüğü için düşük ilerleme oranı ve yüksek kesme hızı ile düşük kesme derinliği parametrelerinin uygun olduğu anlaşılmıştır

Anahtar Kelimeler

• Sert tornalama
• Yüzey pürüzlülüğü
• Cevap yüzey metodu

Kaynakça

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