对于槽铣刀或角度铣刀,为了防止刀尖烧伤和崩刃,增加强度、延长寿命,要背圆角。但是背圆角γ时,外径保持不变,γ背不起来,有时γ合乎要求,外径尺寸又小了。由于角度的变化,引起相切圆及尖角尺寸变化,所以尺寸小或γ不合适,会降低刀具寿命。要想得到合乎要求的圆角γ,就必须留出一定余量,下面谈谈如何确定留量△t。 For slot milling cutter or angle cutter, in order to prevent the tip burns and chipping, increase strength, extend life expectancy, to fillet. However, when the back fillet γ, the outer diameter remains unchanged, γ back does not rise, and sometimes γ is required, the outer diameter size is small. Due to the change of angle, which leads to the change of the size of tangential circle and sharp corner, the small size or γ is not suitable, which will reduce the tool life. In order to get the desired fillet γ, we must set aside a certain margin, the following talk about how to determine the reserve △ t.