第七章__鉆削和鉆頭

1、Department of Mechanical Engineering, NingXia University#1Department of Mechanical Engineering, NingXia University#2Department of Mechanical Engineering, NingXia University#3 麻花鉆的結構麻花鉆的幾何角度麻花鉆的結構和幾何角度Department of Mechanical Engineering, NingXia University#4麻花鉆是一種形麻花鉆是一種形狀較復雜的雙刀狀較復雜的雙刀槽孔加工工具。槽孔加工工具。

2、 Department of Mechanical Engineering, NingXia University#5麻花鉆按其功用的不麻花鉆按其功用的不同同, , 可以分為三部分可以分為三部分: :1 1鉆柄鉆柄(Shank);(Shank);2鉆頸鉆頸(Neck);(Neck);3鉆體鉆體(Body)(Body)。鉆柄鉆柄: : 鉆頭上供裝夾用的部分鉆頭上供裝夾用的部分, , 并用以傳遞鉆孔所需的動力并用以傳遞鉆孔所需的動力( (扭扭矩和軸向力矩和軸向力) )。鉆頸鉆頸: : 位于刀體和鉆柄之間的位于刀體和鉆柄之間的過渡部分。通常用作砂輪退刀用過渡部分。通常用作砂輪退刀用的空刀槽。的空刀槽

3、。鉆體鉆體: : 鉆頭的工作部分鉆頭的工作部分, , 由切由切削部分削部分( (即鉆尖即鉆尖) )和導向部分組成。和導向部分組成。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 鉆削用量和切削層參數(shù)鉆削特點和鉆削力鉆削用量選擇鉆削用量和鉆削力Department of Mechanical Engineering, NingXia University#17鉆削運動鉆削運動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鉆頭磨損特點：鉆頭磨損特點： （1） 磨損的主要原因：高速鋼鉆頭是磨損的主要原因：高速鋼鉆頭是相變磨損外圓周切削速度最高，故磨損最相變磨損外圓周切削速度最高，故磨損最為嚴重。為嚴重。 （2） 磨損的形式：磨損的形式： 主要是后面磨損，當主刃削刃后面磨損

7、主要是后面磨損，當主刃削刃后面磨損達一定程度時，好似伴隨有刃帶磨損，易達一定程度時，好似伴隨有刃帶磨損，易咬死而導致鉆頭蹦刃或折斷。咬死而導致鉆頭蹦刃或折斷。 （3） 影響鉆頭耐用度的因素：影響鉆頭耐用度的因素： 主要包括：鉆頭材料與熱處理狀態(tài)，鉆主要包括：鉆頭材料與熱處理狀態(tài)，鉆頭結構刃型參數(shù)，切削條件等。頭結構刃型參數(shù)，切削條件等。 Department of Mechanical Engineering, NingXia University#221鉆頭直徑：鉆頭直徑： 先鉆孔再擴孔時，鉆孔直徑取孔經(jīng)的先鉆孔再擴孔時，鉆孔直徑取孔經(jīng)的 50% 70% 2進給量：（一般）進給量：（一般）

8、可按下式估算：可按下式估算： f (0.01 0.02)d 合理修磨的鉆頭可選用合理修磨的鉆頭可選用 f 0.03d 直徑小于直徑小于 3 5 的鉆頭，長用手動進的鉆頭，長用手動進給給 3鉆削速度鉆削速度Department of Mechanical Engineering, NingXia University#23 橫刃的修磨 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群鉆群鉆S型橫刃鉆等多種先進鉆介紹型橫刃鉆等多種先進鉆介紹深孔鉆深孔鉆群鉆的優(yōu)點和特點群鉆的優(yōu)點和特點Department of Mechanical Engineering, NingXia University#29Department of Mechanical Engineering, NingXia University#30Department of Mechanical Engine