Research on Modularized Milling NC System of STEP-NC Based on Function Block Technology

The modular design of numerical control system is carried out by proposing seamless transmission of neutral file based on STEP-NC standard.The system is built in the VC++6.0 environment on the basis of PC flat roof,DSP locomotion control card and relevant drivers.Its software design can be reconstructed based on the modularized function block technology,and thus a modularized STEP-NC Milling system is built.The system includes STEP-NC interpreter,function database,Dynamic Linkable Library,STEP-NC repository,function block type database,and tool path generator.The system can receive data from the STEP-NC interpreter by using the resource model of the function block type database,then translate the receiving data into the data of function block format;the tool path generator can dynamically transfer the function block in the function block type database;it can also use the data of function block management resource to export DSP order;depending on VC to edit function database and Dynamic Linkable Library,we can connect the tool path generator with research platform,use the tool path generated from the tool path generator to drive the tool move.STEP-NC provides the modularized NC system with powerful data support,and the design of STEP-NC system is preliminary achieved depending on the function block technology.The combination of STEP-NC technology standards and function blocks provide an effective research approach to the realization of the flexible and intelligent NC machining.