The Development And Application Of The CMM In Reverse Engineering Of The Part Of Cigarette Machine

The figure of the part's original shape depend on digital equinpent mostly.Digital equiment is divided into two big types,contac ttype and uncontact tyope.The contact type decelop with the optical and electonic element applied widely.Uncontact measurement is rapid.The measured part is not scared, but it requirethat the measured part's surface can glisten.CMM is typical delegate of contact measurementComparing to uncontact measurement,CMM is slow ,but it has upper measurement precision.In range of required figure precision,it will affact the selective way of moddfile cuver.The contact freeform surface meaurement system the authors are developing is introduced in this paper, It is the application of CMM in the Reverse engineering of part.The components of its software and hardware are analyed.Under the circumstances of CAD modelis unknown,Somecirtical problems are studied such as the measurement points adaptive localization,the measurement path,layout and measurement data disoposal etc.Based on measuring the curved surface of the cam,the scaning software have be designed in measuring the curved surface in CMM.The CMM's data can transfer to CAD/CAM system.At designing of the measurement points adaptive localization,author advanced three points adaptive localization .Tt solved the problem of the measurement points adaptive localization under the circumstances of CAD modelis unknow.It also solced the problem of the measurement path with radius rack and tip rotativing track.In the part of program design,author designed corresponding measurement programs based on the part's shape and peculiarity and solved the problem of measuring complicated parts.It is proved that the ways in this artics is viale and effective.