Product data management (PDM) is a new technique that is developed from database management system (DBMS) to manage the information and the associated procedure of a product. Many design engineers have employed PDM to...Product data management (PDM) is a new technique that is developed from database management system (DBMS) to manage the information and the associated procedure of a product. Many design engineers have employed PDM tools to coordinate and control access to documented versions of product designs. But it is still a focus of research efforts in industry and academic how to further build an efficient and effective integrated product/process development environments (IPDEs) based on PDM to meet requirements of enterprises. This paper introduces the approach to design and implementation of an integrated CAD/CAPP system (IC2S) based on PDM. This system is an important compent of computer integrated manufacturing system in KELON Inc(Kelon-CIMS). It is mainly used to support for the design and development of the home electric appliances (HEA).展开更多
CAD technique and its software products have been d ev eloped independently of CAPP, but the market’s requirements on reducing lead-t ime of a new product and promoting automation of design and manufacture processe s...CAD technique and its software products have been d ev eloped independently of CAPP, but the market’s requirements on reducing lead-t ime of a new product and promoting automation of design and manufacture processe s need integration of CAPP with CAD. The base of CAXs’ integration in product d esign and manufacture is information integration. There are several information integration approaches, for example, by data format transition through special d ata interface, or by standard format file for data exchange (e.g. based on S TEP),etc, but the integrating approach based on PDM is a more advanced and effic ient one. The approach is based on a common database. The feature model data of a product created by the CAD sub-system is stored in the common database, and the CAPP or CAM sub-system can get access to the data for its own work, by whic h repeated input of the data is avoided and data redundancy is eliminated. T he integration approach of CAPP with CAD discussed in this paper is based on the approach. Solid Edge, one of the CAD software products of UGS company is a 3-D modeling software based on parametric feature modeling technique, which is easy to learn and use, so suitable for small and medium manufacturers’ application. The feature data of the part model created by Solid Edge Part includes geometri c and topologic information of the part which provides basic data needed by CAPP , but like other 3-D feature-based modeling software, no precision and materia l information which is also essential for CAPP. In this paper, an approach is pr esented by which the precision features and material features of the part are ad ded into the 3-D CAD part model of geometric feature. So-called precision features include dimension tolerance, shape tolerance and position tolerance and so-called material features include material type and hardness. All these data are expressed by a set of characters which, combined with the surface t ype name of the related geometric feature, is substituted for the original syste m name of the geometric feature by using the rename function of the feature tree in the EdgeBar of "Solid Edge Part" GUI. If a feature joint of the feature tree is pointed by the mouse cursor, the related profile of the model in the working area of Solid Edge Part GUI is highlighted. In this visual way, precision featu res and material features of the part are added into the part model and for each geometric feature of a part model, the surface type and dimensions created by t he 3-D feature-based modeling software are combined with the precision and mat erial properties added. Then by a VB program, all these feature data are extract ed from the model and stored in a feature table of the common database ready for CAPP visit. The database is built by using Microsoft Access. The precision feat ures and material features data are obtained by applying "split" function of VB to the character set extracted as the name property of each geometric feature ob ject of the part model. The VB program can be made a custom-defined menu comman d running in the GUI of Solid Edge Part. All of the other related key techniques are detailed in the paper and an example is given.展开更多
A brief discussion of the content and methodology of STEP is given, and STEP based strategies for CAD/CAPP information integration is pointed out. A STEP based feature technology in which a three layer feature defini...A brief discussion of the content and methodology of STEP is given, and STEP based strategies for CAD/CAPP information integration is pointed out. A STEP based feature technology in which a three layer feature definition is included is discussed, the content of feature information is analyzed and a stratified CAD feature library is shown. On these bases, a commonly shared part information model is proposed. The architecture of the integrated CAD/CAPP system is presented.展开更多
The information integration of CAD/CAPP is one of the crucial techniques in CIM. Thispaper desicribes an integrated CAD/CAPP system which is implemented by connecting MPIM to BR-CAPP via an interface for data exchange...The information integration of CAD/CAPP is one of the crucial techniques in CIM. Thispaper desicribes an integrated CAD/CAPP system which is implemented by connecting MPIM to BR-CAPP via an interface for data exchange between them. The data exchange between MPIM and BR-CAPP is accomplished through STEP neutral file.展开更多
文摘Product data management (PDM) is a new technique that is developed from database management system (DBMS) to manage the information and the associated procedure of a product. Many design engineers have employed PDM tools to coordinate and control access to documented versions of product designs. But it is still a focus of research efforts in industry and academic how to further build an efficient and effective integrated product/process development environments (IPDEs) based on PDM to meet requirements of enterprises. This paper introduces the approach to design and implementation of an integrated CAD/CAPP system (IC2S) based on PDM. This system is an important compent of computer integrated manufacturing system in KELON Inc(Kelon-CIMS). It is mainly used to support for the design and development of the home electric appliances (HEA).
文摘CAD technique and its software products have been d ev eloped independently of CAPP, but the market’s requirements on reducing lead-t ime of a new product and promoting automation of design and manufacture processe s need integration of CAPP with CAD. The base of CAXs’ integration in product d esign and manufacture is information integration. There are several information integration approaches, for example, by data format transition through special d ata interface, or by standard format file for data exchange (e.g. based on S TEP),etc, but the integrating approach based on PDM is a more advanced and effic ient one. The approach is based on a common database. The feature model data of a product created by the CAD sub-system is stored in the common database, and the CAPP or CAM sub-system can get access to the data for its own work, by whic h repeated input of the data is avoided and data redundancy is eliminated. T he integration approach of CAPP with CAD discussed in this paper is based on the approach. Solid Edge, one of the CAD software products of UGS company is a 3-D modeling software based on parametric feature modeling technique, which is easy to learn and use, so suitable for small and medium manufacturers’ application. The feature data of the part model created by Solid Edge Part includes geometri c and topologic information of the part which provides basic data needed by CAPP , but like other 3-D feature-based modeling software, no precision and materia l information which is also essential for CAPP. In this paper, an approach is pr esented by which the precision features and material features of the part are ad ded into the 3-D CAD part model of geometric feature. So-called precision features include dimension tolerance, shape tolerance and position tolerance and so-called material features include material type and hardness. All these data are expressed by a set of characters which, combined with the surface t ype name of the related geometric feature, is substituted for the original syste m name of the geometric feature by using the rename function of the feature tree in the EdgeBar of "Solid Edge Part" GUI. If a feature joint of the feature tree is pointed by the mouse cursor, the related profile of the model in the working area of Solid Edge Part GUI is highlighted. In this visual way, precision featu res and material features of the part are added into the part model and for each geometric feature of a part model, the surface type and dimensions created by t he 3-D feature-based modeling software are combined with the precision and mat erial properties added. Then by a VB program, all these feature data are extract ed from the model and stored in a feature table of the common database ready for CAPP visit. The database is built by using Microsoft Access. The precision feat ures and material features data are obtained by applying "split" function of VB to the character set extracted as the name property of each geometric feature ob ject of the part model. The VB program can be made a custom-defined menu comman d running in the GUI of Solid Edge Part. All of the other related key techniques are detailed in the paper and an example is given.
文摘A brief discussion of the content and methodology of STEP is given, and STEP based strategies for CAD/CAPP information integration is pointed out. A STEP based feature technology in which a three layer feature definition is included is discussed, the content of feature information is analyzed and a stratified CAD feature library is shown. On these bases, a commonly shared part information model is proposed. The architecture of the integrated CAD/CAPP system is presented.
文摘The information integration of CAD/CAPP is one of the crucial techniques in CIM. Thispaper desicribes an integrated CAD/CAPP system which is implemented by connecting MPIM to BR-CAPP via an interface for data exchange between them. The data exchange between MPIM and BR-CAPP is accomplished through STEP neutral file.
