机械制造技术基础英文课件CHAPTER1(4)

(5) Transverse section Pf, longitudinal section Pp, transverse section or

longitudinal section system

Pr －Pf－Pp

Fig.1.9 Transverse section Pf,

longitudinal section Pp

TransversesectionPfisaplanepassingthroughadesignatedpointoncuttingedgeandparalleltothedirectionoffeedingmotionandperpendiculartothetoolreferenceplanePr..Normally,Pfisasectionparallelornormaltoacertainplaneoraxisofthetooleasyforgrindingandsetup,shownasFig.1.9.LongitudinalsectionPpisaplanepassingthroughadesignatedpointonthecuttingedgeandperpendiculartothetoolreferenceplanePrandthetransversesectionPf.

1.1.2.3 Reference system for the working angles of cutting tools

In the definition of tool reference plane Prthe feeding motion is not considered, i.e. the marked angles of the cutting tool is determined under the predetermined conditions . It is no true in practice,where only the resultant ve reflects the situation. For example，Fig.1.10 shows three tools having the same marked angles,but the practical conditions,like the contact and friction,are very different

It is same considering the affection of the tool setup position, except that veis replaced by vc，where vcis the practical feeding direction instead of the predetermined direction.

Fig.（a）it is normal, where there is clearance between the flank and the workpiece.

(a)

Fig.1.10 the working angle of the tool

Fig.（b）, two surfaces are completely contacted, causing serious friction；

(b)

Fig.1.10 Working angles of the tool

in Fig.（c）,the cutting edge can not enter into the metal.Therefore, only consider the main motion is not proper. The working angles of the tool must be decided by the working reference system, i.e.,consider the direction of the resultant motion

刀具工作角度示意图

Fig.1.10 the working angles of the tool

百度搜索“77cn”或“免费范文网”即可找到本站免费阅读全部范文。收藏本站方便下次阅读，免费范文网，提供经典小说综合文库机械制造技术基础英文课件CHAPTER1(4)在线全文阅读。