The traditional rolling sleeve technology and mold design and manufacturing efficiency are low, cost and cycle. Therefore, the development of the dedicated rolling sleeve mold CAD system enables designers to quickly and efficiently design practical molds, improve the manufacturing precision and production of molding molds. Efficiency, shorten product development cycle, improve product quality and reduce product cost.
Demand Analysis of 1 Rolling Bushing Die CAD
In the design of rolled sleeve molds, the traditional manual design method has the disadvantages of slow design speed, excessive dependence on experience analogy, long mold development cycle, poor quality, high cost, etc. Therefore, it is necessary to design the CAD system of the rolled sleeve mold. Freed from cumbersome access to data and diagrams, reducing dependence on designer experience, assisting designers in making decisions, reducing designer drawing effort, improving mold design automation and intelligence, shortening product development cycles, improving mold quality and Efficiency, according to this task, to develop the specific functions of the system, including analyzing the processability of the workpiece, calculating the number of processes and determining the process plan, mold work parts and standard parts design, and mold assembly drawing, part drawing and title bar, and automatic generation of the schedule Wait. The software is designed to realize the design of the rolling sleeve forming die. Through the software, the user inputs the original parameters of the bushing product (the inner diameter, the outer diameter of the bushing and the width of the bushing, etc.), which can be output as needed. The drawing of the mold (part drawing and assembly drawing) and the design calculation data (including the working part of the mold, that is, the main dimensions of the concave and convex molds, as well as the parameters necessary for the machining process such as the bending force and the correcting force, etc.). All design materials and graphics are automatically archived and spared. The software can realize the serial design of the rolling sleeve mold. For the design of similar product molds, only a slight modification of the program can achieve the requirements of expanding the design range.
Overall design scheme of 2-roll bushing mold CAD system
The development of the rolling sleeve mold CAD system is based on the Windows XP operating system. The visual programming tool Visual C 10 + 6.0 is used to redevelop the existing 3D CAD software UGS 180. The database management system uses the Access2000 database. The rolling sleeve mold CAD system is a guide system that can guide the user to complete the design work of the rolled sleeve mold according to certain steps, and changes the experience of relying on experts or engineers when developing molds using traditional CAD design software. The development steps are cumbersome. And the shortcomings of the long development cycle. The rolling sleeve mold CAD system is the computer-aided design part of the rolling sleeve mold CAD/CAE/CAM system. It is based on UG as the supporting platform. It uses UG/OPENAPI interface programming technology and MenuScript in Visual C++ integrated development environment (IDE). Menu integration technology to develop a mold CAD system that is fully integrated into the UG system.
The main task of the overall design of the system is to determine the module structure of the system and establish the functional modules of the system. It consists of dividing the system into modules, determining the interface between the modules and evaluating the quality of the module partitions. According to the design requirements of the rolled sleeve mold, the system mainly completes four parts of work: product data model establishment, stamping process design and analysis, mold structure design and molding process analysis. The structure of the rolling sleeve mold CAD system is shown in the figure below. Each module in the system is independent and can be programmed separately. The data exchange and transmission between the modules through the human-computer interaction interface, which reduces the complexity of design and development, and facilitates the maintenance and expansion of programming and system.
(1) Parts information input module
The part information input module inputs information such as the geometric size, precision, material and process conditions of the user's desired product into the computer, generates a three-dimensional solid model and two-dimensional graphics of the part, and stores the above information in the database for subsequent The design provides the required product information.
(2) Process design module
Process design includes process analysis, process plan selection, process calculation, and more.
The processability is the adaptability of the stamping parts to the stamping process, and the process judgment directly affects the quality of the parts and the life of the mold. In the CAD system of the rolling sleeve mold, the interactive query method is adopted, and the typical diagram of the process is used to check and judge through human-computer interaction. The human-machine dialogue mode is adopted, and the user makes a judgment according to the actual production situation. The process calculation includes wool calculation, process calculation, force calculation, press selection and mold work part strength check, and the above information is stored in the database to lay the foundation for mold design.
(3) Mold design module
The mold design module can adopt either a bottom-up design or a top-down design, that is, the user can design the assembly structure first and then design the parts; or design the parts first, and then assemble the design. Both the automatic design of the standard structure and the interactive design of the non-standard structure can be performed. The design process includes the selection of structural types, the design of working parts, the design of auxiliary parts, and the selection of formwork and standard parts.
In the mold design process, a large number of standard parts are required. In the modeling process of the standard parts, it is necessary to repeatedly consult the manual to determine the standard shape of the parts, which takes a lot of time. In order to avoid these duplication of work, people have proposed A variety of standard parts library. The establishment and use of the standard parts library improves the design efficiency and quality, and fully embodies the economic benefits brought by the use of CAD systems. It is an indispensable link for the practical application of CAD systems.
(4) 2D drawing generation module
The 2D drawing generation module automatically generates the main view, the top view, and the left view of the assembly drawing and the part drawing, and automatically fills in the title bar and the schedule.
UG itself provides the PartsList tool for users to draw title bars and schedules, but requires users to manually define attribute information for parts and organize them into PartsList format, and a PartsList format can only be used for one type of schedule. This method is not only cumbersome, but also very inflexible. In response to this problem, the author used the UG/OpenAPI function to program the title bar and schedule automatic generation program.
(5) Data Management Module
The data management system is responsible for data processing and management, mainly to store information such as part information input module and process analysis and calculation module data, data extraction of mold design module and data exchange between modules. The system selects ACCESS database, uses UG/OpenAPI to develop and design in Visual C++ environment, and uses SQL ODBC interface to connect with database.
3 Conclusion
With the integrated software UG as the support platform, under the Visual C++ integrated development environment (IDE), the UG secondary development tool is used to establish and develop a special mold CAD system. The interface is simple and intuitive, easy to operate, and has good human-computer interaction. Scalability and portability, suitable for product serial design. The use of the system can significantly reduce the labor intensity in the user design process, and provides a strong guarantee for the technician to carry out accurate and rapid design, greatly improving the design efficiency of the mold and the manufacturing precision of the product, and promoting the standardization of design and manufacturing. Reduce the cost of molds and products, and lay a good foundation for the development of CAD/CAE/CAM systems based on UG products and the automated design and manufacture of molds.
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