Study On Manufacturability Evaluation Of Parts Based On The STEP-NC In Network Manufacturing Environment

International Organization for Standardization has developed a new data model standard ISO14649 to replace the current ISO6983 standard recently, which is the existing Standard of Exchange Product Model Data (STEP) expending to the NC field, so it is commonly called STEP-NC. STEP-NC data model contains all of the information from rough to finished pieces,concerning the three-dimensional geometric information, tool information,manufacturing feature information and process information. The completeness of the information laid the foundation for achieve the intelligence of CNC system.At first,this paper introduces the origin, background, significance of the topic as well as STEP-NC research at home and abroad.Then the important concepts of STEP-NC,data model, manufacturing characteristics and forms of realization are described in detail,which paved the way for the follow-up issues.Throught in-depth study of STEP-NC standard, this paper has proposed the part manufacturability evaluation model based on the STEP-NC, the aim of which is to achieve the manufacturability evaluation for parts to be processed on CNC machining tools.A suitable manufacturing resource model for manufacturability evaluation of parys has been constructed by analyzing the description of parts processing technology based on the STEP-NC programs.The index system and methods of manufacturability evaluation for parts to be processed with the specific manufacturing resources on CNC machine tools have been proposed.The information extraction module for STEP-NC data has been improved. The workpiece information base used to save the extracted information about STEP-NC has been established in order to provide the basis for the manufacturability evaluation.The manufacturability evaluation system of Parts based on the STEP-NC has been developed using VisualC + +6.0 and Access2003 database and experiments have verified the correctness of the evaluation mechanism and method.This paper starting with STEP-NC standard has established a manufacturability evaluation model of parts based on STEP-NC according to the principle and methodology of STEP standards.From a technical point of view, this paper has established realistic and reasonable evaluation mechanisms and the overall program,which will provide a meaningful reference for the intelligent manufacturing.