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(jié)構(gòu)麻花鉆的幾何角度麻花鉆的結(jié)構(gòu)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(fù)雜的雙刀狀較復(fù)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(dòng)力并用以傳遞鉆孔所需的動(dòng)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(dǎo)向部分組成。和導(dǎo)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(diǎn)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(yùn)動(dòng)鉆削運(yùn)動(dòng)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(diǎn)：鉆頭磨損特點(diǎn)： （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(yán)重。為嚴(yán)重。 （2） 磨損的形式：磨損的形式： 主要是后面磨損，當(dāng)主刃削刃后面磨損

7、主要是后面磨損，當(dāng)主刃削刃后面磨損達(dá)一定程度時(shí)，好似伴隨有刃帶磨損，易達(dá)一定程度時(shí)，好似伴隨有刃帶磨損，易咬死而導(dǎo)致鉆頭蹦刃或折斷。咬死而導(dǎo)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(jié)構(gòu)刃型參數(shù)，切削條件等。頭結(jié)構(gòu)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(kuò)孔時(shí)，鉆孔直徑取孔經(jīng)的先鉆孔再擴(kuò)孔時(shí)，鉆孔直徑取孔經(jīng)的 50% 70% 2進(jìn)給量：（一般）進(jìn)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(zhǎng)用手動(dòng)進(jìn)的鉆頭，長(zhǎng)用手動(dòng)進(jìn)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(jìn)鉆介紹型橫刃鉆等多種先進(jìn)鉆介紹深孔鉆深孔鉆群鉆的優(yōu)點(diǎn)和特點(diǎn)群鉆的優(yōu)點(diǎn)和特點(diǎn)Department of Mechanical Engineering, NingXia University#29Department of Mechanical Engineering, NingXia University#30Department of Mechanical Engine