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55钻黄铜为什么容易产生扎刀现象?答:由于黄铜材料塑性小,切屑崩碎,切屑对切削刃前面的摩擦力很小,切屑对刀刃的作用力主要是弹性压力,刀具越锋利,即前角越大,则弹性压力的作用方向越是将刀刃压向工件体内,加之黄铜材料软、强度低、组织松,则促进刀刃的扎入,于是“扎刀”现象就产生了(图22)。56如何避免“扎刀”现象?答:可适当修磨切削刃前面,减小前角和切削刃的锋利程度,即可避免扎刀现象。57钻黄铜群钻的几何参数是多少?
55 Brass Why easy to produce blade? A: Due to the small plasticity of brass, the chip collapse, the chip in front of the cutting edge friction is very small, the force of the chip on the blade is mainly elastic pressure, the more sharp the tool, That is, the greater the rake angle, the more the elastic pressure acts in the direction of the blade to the workpiece body, combined with the brass material soft, low strength, loose tissue, then promote the cutting edge of the plunge, so “tie knife” Figure 22). 56 How to avoid the “tie knife” phenomenon? A: You can properly sharpen the cutting edge in front to reduce the rake and cutting edge sharpness, you can avoid the phenomenon of knives. What is the geometric parameters of 57 drill brass group drilling?