Digital control process imitation utilizes the calculating machine imitation practice process , being the forceful means to verify digital control processing program dependability and the calculation cutting action process , in order to decrease work attempies surely , and lifts production efficiency 

3.2 digital control technique of simulation research present situation 

The APT process spare parts are completeed near the digital control order program control . 

In the interest of right quality to guarrantee the digital control order , guard against in process to intervene happenning , and is living in the actual manufacture , and  constantly adopts attempting the anxious means to examine with what runs into . 

Yet this kind of means requiring a lot of labor expense is anticipateed , the cost  expansively causes the manufacturing cost move upward , addd produce process time and production cycle . 

Adoping once more the locus to display the law afterwards , in immediate future in order to mark needle either pencil or writing brush replace the cutting tool , with colouring plank either paper replaces the work imitation cutting tool movement locus two dimension figure ( also may display the two dimension semi process locus ) , possess the considerably great limitations . 

Three dimension and the many-dimensionss as to the work are processed , the cutting action locus that the inspection that the stuff that  also possess use easily to cut replaces the work ( in case , paraffin wax , lumber , midified resin and plastic material and so on ) comes is processed . 

Yet APT and the process field is very important occupied in the attempt . 

For this reason , people are living always to research replace gradually attempting the anxious calculating machine emulation mode , and is living to attempt to slice that the respects such as environment modeling and imitation calculation and graphic display and so on acquire the significant progress , and   develops to raise pattern accurateness and imitation calculation real timeization and improvement real feeling of graphic display and so on orientations at the moment 

Through attempies the pattern distinguishing feature sliceeing the environment seeing , NC's cutting action process imitation branch geometry imitation and mechanics imitation at the moment two respects . 

Geometry imitation is not  consider that cutting action parameter and cutting force reach else the physics elements effects , the imitation cutting tool work geometric object movement , and with right quality of certification NC's order . 

The problem such as it may decrease either remove as a result of the machine tool injury that the program error causes and clamping apparatus damage either the cutting tool rolls over to snap and the spare parts are reported something as worthless and so on ; 

May decrease moreover through the product design up time manufacturing , and cut down the manufacturing cost . 

Cutting action process mechanics imitation pertains to the physics imitation category , and its dynamic mechanics property by means of the imitation cutting action process is forecast that the cutting tool breakage and cutting tool vibration and control cuts the parameter , thereby attains to optimize the cutting action process aim 

The geometry technique of simulation development is in the wake of geometry model building technique development but development , and consists of that quality graphic display and the ration is intervened verifying two respects . 

At the moment the means in common use possess the immediate solid modelling law , and the means of figure image space baseding on is requestted the intersection law with the scattered vector 

3.3 immediate solid modelling law 

This kind of enveloping solid that the means is the work part of the body against the cutting tool movement takes shape is underway that the entity Boolean falls short of operating , and the work part of the body three dimensions patterns are continuously replaceed in the wake of the cutting action process