Effect of drill geometry on hole quality and cutting performance

Year 2017, Volume: 21 Issue: 5, 1051 - 1066, 01.10.2017

Mehtap Yavuz , Harun Gökçe , Çağlar Yavaş İhsan Korkut , Ulvi Şeker

https://doi.org/10.16984/saufenbilder.292019

Cited By: 4

Abstract

In this study, the effects of different drill geometries
and cutting parameters on drilling performance have been systematically
investigated. Using four types of drills with different geometries, thrust,
torque, surface roughness and geometric tolerance deviations are measured.
Experimental studies have tested the performance of commercially available
two-tool geometry and developed original two-channel geometry. The drilling
operation was performed on GGG 50 material using a 10 mm diameter, two-spindle,
helical, solid cementitious carbide drills. For experiment design, a Taguchi
Test Design was created with three different control factors of four levels,
geometric form of drill, cutting speed and feed. The taguchi S/N analysis and
the graphs in which the obtained data were processed were used in the
evaluation of the test results. With the help of the Anova analysis, importance
and influence rate on the test results of experimental parameters found.
Experimental results were evaluated and optimum geometry and optimum cutting
conditions were determined. According to the results evaluated by "the
smallest best" approach in Taguchi signal-noise analysis; The originally tool
4 has superiority to other geometries in terms of thrust force, Input-output
surface roughness, deviation from circularity, deviation from perpendicularity,
The cutting parameters with the lowest feed rate (0,15 mm/rev.) and the highest
cutting speed (110-120 m/min.) were determined as the optimum levels of control
factors.

Keywords

Drilling, Drill Geometry, GGG 50, Optimization, Taguchi Method

Matkap geometrisinin delik kalitesi ve kesme performansına etkisi

Abstract

Bu çalışmada, farklı
matkap geometrileri ve kesme parametrelerinin delme performansı üzerine
etkileri sistematik bir şekilde incelenmiştir. Farklı geometrilere sahip dört
tip matkap kullanılarak itme kuvveti, moment, yüzey pürüzlülüğü ve geometrik
toleranstan sapma değerleri ölçülmüştür. Deneysel çalışmalarda ticari olarak
temin edilebilen yaygın iki takım geometrisi ile özgün iki kanal geometrisinin performansları
test edilmiştir. Delme operasyonu, 10 mm çapında, iki ağızlı, helisel, yekpare
sementit karbür matkaplar kullanılarak GGG 50 malzemesi üzerinde
gerçekleştirilmiştir. Deney deseni için matkabın geometrik formu, kesme hızı ve
ilerleme miktarı olmak üzere dörder seviyeli üç farklı kontrol faktörü ile bir
Taguchi Deney Tasarımı oluşturulmuştur. Deney sonuçlarının değerlendirilmesinde
Taguchi S/N analizi ve elde edilen verilerin işlendiği grafikler
kullanılmıştır. Anova analizi yardımıyla da deney parametrelerinin deney
sonuçları üzerindeki önemi ve etki oranları bulunmuştur. Deneysel sonuçlar
değerlendirilerek optimum geometri ve optimum işleme şartları belirlenmiştir.
Taguchi Sinyal-Gürültü analizinde “en küçük en iyidir” yaklaşımıyla
değerlendirilen sonuçlara göre; ilerleme kuvveti, giriş-çıkış yüzey
pürüzlülüğü, dairesellikten sapma ve diklikten sapma açısından özgün olarak
geliştirilen 4 numaralı takım geometrisi diğer geometrilere üstünlük sağlarken,
ilerlemenin en düşük olduğu (0,15 mm/dev.) ve kesme hızının en yüksek olduğu
(110-120 m/dak.) kesme parametreleri ise kontrol faktörlerinin optimum
seviyeleri olarak belirlenmiştir.

Keywords

Delik Delme, Helisel Matkap, Matkap Geometrisi, GGG 50, Optimizasyon

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