For instance the cutting tool locating file is merely keep the minutes the cutting tool locus and is not  keep the minutes the relevant process technology parameter , the dynamic imitation of three dimensions  merely keeps the minutes that the cutting tool locus interference against runs into , but   keep the minutes interference and process target and correlation process technology parameter that runs into happen against such 

The CAM systematically is an independence system . 

Not thering is the unitary produce data model between CAD's system together with the CAM's system , even if being the integrated CAD/CAM's system of integration in , one-way and unity is enjoyed also being only to message in all . CAM systematically can not sufficiently comprehend and complete message utilizing CAD's system to have something to do with the produce , feature message that  especially haves something to do with against process , equal CAD's system can not gain the process data message that CAM  systematically come into being yet . This is  give parallel project implementation to bring the hardship  

3、 digitals control techniques of simulation 

3.1 calculating machine imitation approximately idea and application 

The angle through the project is see , and the imitation is the system by means of the test to the system model leave to research in the existing either design . 

Analysing the complex dynamic target , the imitation is one kind of valid means , may decrease the hazard , cuts down design and manufactures cycle , and practise thrift the investment . 

Calculating machine imitation is draing support from the calculating machine , and utilizes the system model to adjust actually systematically testing the process which researcied . 

It is swiftly developed in the wake of the calculating machine technique development , and is living in the imitation to passess the more and more significant position . 

Three foundation maneuveies between the key element that the calculating machine imitation process may be notify by means of the picture 1 are depictd : 

The model building maneuver is by means of viewing either examination to the actual system , and is living to over look the less important element to reach on the base that examine the variable , and the means in the way of physics either mathematics is depictd , thereby obtains the similar pattern of actual system simplification . 

The meritorous service with the actual system of the pattern here be able to together with between the parameter ought to have similarity and homologous quality 

The imitation pattern is the mathematical model to the system ( simplifying the pattern ) carries on the specified algorithm handle , and causes such become the appropriate shape ( in case turns into iterative operation pattern by the numerical integration ) afterwards , yet becomes " computation module computational mode " that be able to be receiveed by the calculating machine . 

The imitation pattern is two simplification patterns to the actual system 

The imitation test is shall system imitation pattern be living the process rund in the calculating machine . 

The imitation is researching actual system one kind of technique by means of the test , may clarify systematically immanent structure variable and the ambient condition effect by means of the technique of simulation 

Calculating machine technique of simulation main expressing of development tendency be living two respects : Application territory enlargement and imitation calculating machine intelligentization . 

The calculating machine technique of simulation not merely is living tradition project technique territory ( respects such as aviation , spaceflight and chemical industry and so on ) subsequent development , but also broadens up community economy and living beings and so on much non- project territorys , moreover , technique such as parallel processing , artificial intelligence , knowledge base and expert system and so on the development is  affecing the imitation calculating machine development