机械专业英语课件Paragraph1Paragraph2Paragraph3Paragraph3Paragraph4Paragraph4大家应该也有点累了，稍作休息Paragraph4Paragraph5Paragraph6Paragraph7Paragraph7Paragraph8Paragraph9Paragraph10OtherTypesofDrillingOperations钻孔的其它类型Inadditiontoconventionaldrilling,thereareotheroperationsthatareinvolvedintheproductionofholesintheindustrialpractice.Followingisabriefdescriptionofeachoftheseoperations.除了常规钻孔以外，有其他加工工序涉及到工业实践中的孔加工。以下是这些工序的简短描述。BoringBoringinvolvesenlargingaholethathasalreadybeendrilled.Itissimilartointernalturningandcan,therefore,beperformedonalathe.Therearealsosomespecializedmachinetoolsforcarryingoutboringoperations.Thoseincludetheverticalboringmachine,thejigboringmachine,andthehorizontalboringmachine.镗孔镗孔涉及到对已经被钻出的孔的扩大。类似于车内圆，因此能在车床上进行。也有一些进行镗孔加工的专用机床。包括立式镗床、坐标镗床和卧式镗床。CounterboringAsaresultofcounterboring,onlyoneendofadrilledholeisenlarged.ThisisillustratedinFigure1(a).Thisenlargedholeprovidesaspaceinwhichtosetaboltheadoranutsoitwouldbeentirelybelowthesurfaceofthepart.锪沉孔锪沉孔时钻好的孔只有一端被扩大。如插图1(a)中所示。孔被扩大的部分提供了安装螺栓头或螺母的空间，因此它应该整个低于零件表面。(a)Counterboring(b)Spotfacing(c)CountersinkingFigure1Operationsrelatedtodrilling.[5]SpotFacingSpotfacingoperationisperformedtofinishoffasmallsurfaceareaaroundtheopeningofahole.AscanbeseeninFigure1(b),thisprocessinvolvesremovingaminimaldepthofcutandisusuallyperformedoncastingsorforgings.锪端面锪端面用于在孔的开口周围加工出一个小平面区域。如图1(b)所示，其工艺包含去除一个最小的切削深度，常用于铸件和锻件。CountersinkingAsshowninFigure1(c),countersinkingisdonetoenableaccommodatingtheconicalseatofaflatheadscrewsothatthescrewdoesnotappearabovethesurfaceofthepart.锪锥孔如图1(c)所示，锪出的锥孔能容纳平头螺钉的锥形安装位置，以使螺钉不会露出零件表面。ReamingReamingisactuallya"sizing"process,bywhichanalreadydrilledholeisslightlyenlargedtothedesiredsize.Asaresultofareamingoperation,aholehasaverysmoothsurface.Thecuttingtoolusedinthisoperationisknownasthereamer.铰孔铰孔实际上是一个矫正工艺，通过它可以将已钻好的孔轻微扩大到需要的尺寸。铰孔加工可以得到具有非常光滑表面的孔。用于铰孔的刀具被称为铰刀。ClassificationofDrillingMachines钻床的分类Drillingoperationscanbecarriedoutbyemployingeitherportablesmallmachinesorappro