Research And Development On Sheet Metal Bending Parts CAPP System

In the paper, the general framework, the function module and the flow of CAPP System for sheet metal bending parts were elaborated. Using feature technology, from the view of manufacture-oriented, bending parts were regarded as the combination of management feature, material feature, precision feature, shape feature and process feature. Synthesizing the hiberarchy of bending parts information model and the relation of features, the feature model of bending parts was established. Using Object-Oriented Method and Object-Oriented Language, the bending part class was defined, with the part as an object and kinds of feature as its attributes. Bending parts information model was established by describing information of features. This paper earnestly summarized process knowledge of bending parts, expressed the knowledge in the form of the "if (condition), then (conclusion)", and then formed the decision logic of the system by putting process knowledge into the program. Adopting the data-drive mode, the process planning was created by reasoning from initial information of parts. Based on feature modeling and process decision, and combining the function of feature-compress and feature-expand offered by SolidWorks2004, and the technique of creating planar draw from three-dimensional model, making use of ActiveX Automation, the process chart was completed in SolidWorks. On the base of analyzing the characteristics of craft data, the craft data model was established. And the craft database was completed on the database platform: Database Desktop. Making use of the database technique, process management module was developed including building, editing, deleting, preview and printing process planning. Then the program was developed using Delphi6 and SolidWorks2004 on the Windows2000 platform.