第七章__钻削和钻头

1、Department of Mechanical Engineering, NingXia University#1Department of Mechanical Engineering, NingXia University#2Department of Mechanical Engineering, NingXia University#3 麻花钻的结构麻花钻的几何角度麻花钻的结构和几何角度Department of Mechanical Engineering, NingXia University#4麻花钻是一种形麻花钻是一种形状较复杂的双刀状较复杂的双刀槽孔加工工具。槽孔加工工具。

2、 Department of Mechanical Engineering, NingXia University#5麻花钻按其功用的不麻花钻按其功用的不同同, , 可以分为三部分可以分为三部分: :1 1钻柄钻柄(Shank);(Shank);2钻颈钻颈(Neck);(Neck);3钻体钻体(Body)(Body)。钻柄钻柄: : 钻头上供装夹用的部分钻头上供装夹用的部分, , 并用以传递钻孔所需的动力并用以传递钻孔所需的动力( (扭扭矩和轴向力矩和轴向力) )。钻颈钻颈: : 位于刀体和钻柄之间的位于刀体和钻柄之间的过渡部分。通常用作砂轮退刀用过渡部分。通常用作砂轮退刀用的空刀槽。的空刀槽

3、。钻体钻体: : 钻头的工作部分钻头的工作部分, , 由切由切削部分削部分( (即钻尖即钻尖) )和导向部分组成。和导向部分组成。Department of Mechanical Engineering, NingXia University#6Department of Mechanical Engineering, NingXia University#7Department of Mechanical Engineering, NingXia University#8Department of Mechanical Engineering, NingXia University#9Dep

4、artment of Mechanical Engineering, NingXia University#10Department of Mechanical Engineering, NingXia University#11Department of Mechanical Engineering, NingXia University#12。 Department of Mechanical Engineering, NingXia University#13Department of Mechanical Engineering, NingXia University#14Depart

5、ment of Mechanical Engineering, NingXia University#15Department of Mechanical Engineering, NingXia University#16 钻削用量和切削层参数钻削特点和钻削力钻削用量选择钻削用量和钻削力Department of Mechanical Engineering, NingXia University#17钻削运动钻削运动min)/(1000mdnvcnZfnfvzfDepartment of Mechanical Engineering, NingXia University#18Depart

6、ment of Mechanical Engineering, NingXia University#19 Department of Mechanical Engineering, NingXia University#20Department of Mechanical Engineering, NingXia University#21 3钻头磨损特点：钻头磨损特点： （1） 磨损的主要原因：高速钢钻头是磨损的主要原因：高速钢钻头是相变磨损外圆周切削速度最高，故磨损最相变磨损外圆周切削速度最高，故磨损最为严重。为严重。 （2） 磨损的形式：磨损的形式： 主要是后面磨损，当主刃削刃后面磨损

7、主要是后面磨损，当主刃削刃后面磨损达一定程度时，好似伴随有刃带磨损，易达一定程度时，好似伴随有刃带磨损，易咬死而导致钻头蹦刃或折断。咬死而导致钻头蹦刃或折断。 （3） 影响钻头耐用度的因素：影响钻头耐用度的因素： 主要包括：钻头材料与热处理状态，钻主要包括：钻头材料与热处理状态，钻头结构刃型参数，切削条件等。头结构刃型参数，切削条件等。 Department of Mechanical Engineering, NingXia University#221钻头直径：钻头直径： 先钻孔再扩孔时，钻孔直径取孔经的先钻孔再扩孔时，钻孔直径取孔经的 50% 70% 2进给量：（一般）进给量：（一般）

8、可按下式估算：可按下式估算： f (0.01 0.02)d 合理修磨的钻头可选用合理修磨的钻头可选用 f 0.03d 直径小于直径小于 3 5 的钻头，长用手动进的钻头，长用手动进给给 3钻削速度钻削速度Department of Mechanical Engineering, NingXia University#23 横刃的修磨 主切削刃的修磨 前面的修磨 后面的修磨Department of Mechanical Engineering, NingXia University#24Department of Mechanical Engineering, NingXia Universi

9、ty#25 Department of Mechanical Engineering, NingXia University#26Department of Mechanical Engineering, NingXia University#27Department of Mechanical Engineering, NingXia University#28群钻群钻S型横刃钻等多种先进钻介绍型横刃钻等多种先进钻介绍深孔钻深孔钻群钻的优点和特点群钻的优点和特点Department of Mechanical Engineering, NingXia University#29Department of Mechanical Engineering, NingXia University#30Department of Mechanical Engine