高速钢钻头及硬质合金钻头切削用量的选用.pdf

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1、高速钢钻头的切削用量(推荐值)硬质合金钻头的切削用量(推荐值)钻头直径切削速度进给量进给速度钻头直径切削速度进给量进给速度加工材料加工材料(ød)V(m/min)f(mm/r)F(mm/min)(ød)V(m/min)f(mm/r)F(mm/min)623.60.11251075.40.15360825.50.12122碳素结构1589.50.183421025.10.14112钢和优质20103.60.22363碳素结构15260.1899碳素结构25117.80.25375钢和优质2025.50.2289钢(HB125301130.28336～225）碳素结构25240.2576

2、351040.3285钢(HB12530220.286540100.50.33264～225）35200.35540190.35531062.80.240045170.42501584.80.2239660150.540铸铁2094.20.25375(HB120251020.28364620.70.15165～225）3094.20.3300823.90.21903593.40.332801023.60.261954087.90.352451525.90.32176铸铁2025.10.38152(HB1202527.50.42147～225）3026.40.48134注：1.以上切削

3、参数使用条件：孔深=3ød；硬质合金钻头3519.80.5294内冷充分冷却。40150.55662.对孔的精度要求较高或孔表面粗糙度要求较高时，4514.10.660可适当提高转速，降低进给量。6014.10.6549钻头直径mm<φ15<φ15~φ30<φ30~φ50进给量mm/r0.05~0.150.15~0.250.20~0.30硬质合金钻头线速度ν=100~120m/min高速钢钻头(HSS)1>Q235-Aν=30m/min2>16Mnν=20m/min切削速度ν：刀类相对于工件的线速度ν=π•d•n即圆周长×转速高速钢钻头线速度：ν=25~30m/min进给量（吃刀量）

4、mm/r钻头每转一转走的长度（轴向），取：0.2mm/rmm/刃×Z（齿数）取0.1~0.2mm/刃硬质合金钻头线速度ν=100~120m/min孔的精度：孔径公差；孔的表面光洁度钻孔精度：孔距公差；孔的垂直度THETWISTDRILLSThetwistdrillisthemoresimpletoolfordrillingholescylindrical,usuallyfromsolid.Thetwistdrillisformedby:ñbyacylindricalorconicalshanktocenteronthespindleofthemachineandtransmitthe

5、cuttingtorque(byfrictionordragtooth)ñbyacylindricalpartinwhicharecarriedtwoopposinghelicalgrooves,whichintersectwithsurfaceendsformthetwomaincuttingedges.Thetwohelicalgroovesallowtheevacuationofthechipthatisformedatthecuttingedges,andleadnearthesame,thelubricating/coolantfluid.Characteristicele

6、mentsofendsThecheckordrivingsurfaces(withrakeanglelowerbyabout2°)areformedbytwooff-setdiametricallyopposedtothelimitofthehelicalgroovesandhaveadualfunction:Ãdrivingthetipintotheholewithouteventhejamduringdrilling,becausethecontactbetweenthedrillandsidesoftheholeislimited.Ãfinishingthecylindrica

7、lsurfaceofthehole.Thecentralcore(centralscrapingedge)betweenthetwogrooveshasadiameter(0.1~0.2)×Dandprovidestogivethetorsionalstrengthtothedrillduringmachining.HoweverforaholemadebyatwistdrillwecanbeobtainedthemaximumstandardofIT10