Sertleştirilmiş 32CRMOV12-10 Takım Çeliğinin Elektro Erozyon Tezgâhında Delme Performansının İncelenmesi

Öz

Bu çalışmada, sertliği 50 HRC olan 32CrMoV12-10 (1.7765) yüksek kaliteli soğuk iş takım çeliğine farklı işleme parametreleriyle EDM işlemi uygulanmıştır. Çalışmanın deneysel tasarımı Taguchi L27 ortogonal dizi kullanılıp hazırlanmıştır. Deneylerde işleme parametreleri olarak üç farklı elektrot malzeme (bakır, grafit, tuncop), üç farklı akım (10, 20, 30 A), üç farklı vurum süresi (200, 400, 600 µs), sabit talaş derinliği (1 mm) ve sabit bekleme süresi (50 µs) kullanılmıştır. Yapılan deneylerin ardından elektrot malzemelerin malzeme yüzeyinde oluşturduğu delik çapları ölçülmüştür. Elde edilen sonuçlar deneysel ve istatistiksel olarak incelenmiştir. Çalışma sonucunda tüm elektrot malzemeleriyle yapılan deneylerde en küçük delik çapının 200 µs ve 10 amper akımda, en büyük delik çapının ise tüm elektrot malzemelerinde 600 µs ve 30 amper akımda oluşmuştur. En küçük delik çapının bakır elektrot ile gerçekleştirilen deneylerde 12.2085 mm olarak, en büyük delik çapının ise tuncop elektrot ile 12.5284 mm olarak ölçülmüştür. Çalışma istatiksel (Sinyal-gürültü oranı) olarak incelendiğinde ideal delik çapını oluşturmak için en uygun işleme parametrelerinin bakır elektrot malzemede, 10 A amper akım ve 200 µs vurum süresi olduğu belirlenmiştir. Varyans analizi (ANOVA) sonuçları incelendiğinde ise delik çapı için en etkili işleme parametresinin %47.85 oranında amper değerinin olduğu tespit edilmiştir.

Anahtar Kelimeler

• Elektro erozyon işleme
• Delik çapı
• Taguchi metot

Investigation of Drilling Performance of Hardened 32CRMOV12-10 Tool Steel on Electro EDM Machine

Abstract

In this study, EDM process was applied to 32CrMoV12-10 (1.7765) high-quality cold work tool steel with a hardness of 50 HRC with different processing parameters. The experimental design of the study was prepared using Taguchi L27 orthogonal array. Processing parameters were used three different electrode materials (copper, graphite, tuncop), three different currents (10, 20, 30 A), three different pulse durations (200, 400, 600 µs), constant cutting depth (1 mm) and constant time off (50 µs). Following the experiments, the hole diameters formed by the electrode materials on the material surface were measured. The results obtained were examined experimentally and statistically. The smallest hole diameter was measured as 12.2085 mm in the experiments carried out with the copper electrode, and the largest hole diameter was measured as 12.5284 mm with the tuncop electrode. When the study was examined statistically (Signal-to-noise ratio), it was determined that the most suitable processing parameters to create the ideal hole diameter were 10 A ampere current and 200 µs pulse duration in copper electrode material. When the analysis of variance (ANOVA) results were examined, it was determined that the most effective machining parameter for the hole diameter was the ampere value of 47.85%.

Keywords

• Electro discharge machining
• Hole diameter
• Taguchi method

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