Overcut Optimization in Machining of DIN 1.2767 Tool Steel with Electro Erosion Technique

Abstract

Electro discharge machining is an energy based method that can cause fast electrode wear and dimensional errors. This study aimed to identify the optimum process parameters for processing 1.2767 steel using copper-based electrodes. The Taguchi optimization approach was used, and 18 pieces of 1.2767 steel were prepared for the experiments. The electrodes used were CuCoNiBe and CuNi2SiCr, and the electrode surfaces were sanded and polished before processing. The results showed that the CuNi2SiCr electrode produced the lowest overcut value of 0.07 mm, while the CuCoNiBe electrode had the highest observed overcut value of 0.320 mm. The discharge level had the most significant impact on overcut, while the type of electrode had the least. The optimal parameters for the CuNi2SiCr electrode were 12 A discharge current, 50 µs pulse duration, and 800 µs pulse off time. The processing under ideal conditions resulted in an overcut measurement value of 0.05 mm.

Keywords

• EDM
• Overcut
• Copper
• Taguchi
• Optimization

DIN 1.2767 Takım Çeliğinin Elektro Erozyon Tekniği ile İşlenmesinde Yanal Açıklık Optimizasyonu

Abstract

Elektro erozyon ile işleme, hızlı elektrot aşınmasına ve boyutsal hatalara neden olabilecek enerji tabanlı bir işleme yöntemidir. Bu çalışma, bakır bazlı elektrotlar kullanarak 1.2767 çeliğini işlemek için optimum işlem parametrelerini belirlemeyi amaçlamıştır. Taguchi optimizasyon tekniği kullanılarak deneyler için 18 adet 1.2767 çeliğinden işparçası hazırlanmıştır. İşleme deneylerinde CuCoNiBe ve CuNi2SiCr elektrot kullanılmıştır ve elektrot yüzeyleri işlemeden önce zımparalanarak parlatılmıştır. Çalışma sonucunda CuNi2SiCr elektrot ile en düşük yanal açıklık değeri olan 0.07 mm, CuCoNiBe elektrod ile en yüksek yanal açıklık değeri olan 0.320 mm elde edilmiştir. Boşalım akımı, yanal açıklık üzerinde en önemli etkiye sahipken, elektrot tipi en az etkiye sahip parametre olmuştur. CuNi2SiCr elektrot için optimum işlem parametreleri 12 A boşalım akımı, 50 µs vurum süresi ve 800 µs bekleme süresi olarak belirlenmiştir. Optimum işleme şartında, yanal açıklık değeri 0.05 mm olarak elde edilmiştir.

Keywords

• EEİ
• Yanal açıklık
• Bakır
• Taguchi
• Optimizasyon

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