공구 윗면 경사각의 변화에 따른 6/4 Brass의 기계적 성질에 관한 연구 = A Study on the Machinability of 6/4 Brass due to the Change of Tool rake Angles

다국어 초록 (Multilingual Abstract)

In turning operation, it is the material of work piece and cutting tool, feed and cutting speed, the depth of cut and rake angle that influence upon the accuracy of demension, the manufacturing efficiency, the extension of tool life and surface roughness.
Especially, the identification of cutting force due to the change of tool rake angle, which exerts a grate influence on the turning, is very important.
In this study, the cutting force of test materials, surface roughness were measured by experiment. And the cutting resistance due to the change of tool rake angle was calculated by applying the three demensional cutting formula, then the conditions of optimal machinability were obtained taking into consideration of the material characteristics.
From the experimental results, the conditions of optimal machinability classified by the test materials are as follows:
1) The normal force acting on the tool face has the minimum value at the true rake angle of 10˚ -15˚ in Brass.
2) The specific cutting resistance is inversely proportional to the depth of cut, feed and cutting speed and the reductionrates of specific cutting resistance has large values, but the reduction rates are almost constant even though the tool rake angle increase.
3) The batter surface roughness is obtained when the cutting speed and the cutting depth decrease. when the cutting speed is more than 150m/min, a batter surface roughness is obtained.
4) The conditions of optimal machinability for Brass are the true rake angle of about 10˚ and the cutting speed of 200m/min.

목차 (Table of Contents)

• Ⅰ. 서 론
• Ⅱ. 이 론
• 2-1. 공구경사면에 작용하는 힘
• 2-1-1. Z축에 대한 회전(ⅰ)
• 2-1-2. X축에 대한 회전(α_b)
• Ⅲ. 실험방법
• Ⅳ. 실험결과 및 고찰
• 4-1. 공구경사면에 작용하는 힘
• 4-1-1. 공구경사면에 작용하는 수직력
• 4-1-2. 공구경사면에 작용하는 수평합력
• 4-2. 윗면경사각 변화에 따른 절삭력 및 표면거칠기
• 4-2-1. 절삭력
• 4-2-2. 표면거칠기
• Ⅴ. 결 론