Research on 3D Fixture CAD System Based on SolidWorks(2)

The base layer of the system is supported by databases, instance libraries, schema libraries, and graphics libraries. The database mainly includes the database of fixture structure elements: standard, manual data information database (tolerance, fit, roughness, etc.); equipment data database. This database requirement is open and can be added to the database by the designer if necessary.

The data input part of the system mainly refers to various effective information of the fixture diagram to be input into the computer: size, shape and position tolerance, surface roughness and the like. This part of the data can be read either from the database or by the user.

The system provides user-generated fixture design solutions based on both instance and human-computer interaction. The most common method of rebuilding the fixture parts and assembly drawings is to use the size drive technology to drive the parts or assembly drawings by reading the data in the database or the data input by the user through the human-machine interface. Part or assembly drawing.

The 3D CAFD system can integrate CAD/CAE/CAM. It can carry out product simulation assembly, finite element analysis calculation, mechanism motion simulation, computer aided manufacturing, etc. on the basis of three-dimensional modeling design, integrating design, analysis and manufacturing. .

2. Modeling method of fixture 3D graphics library and fixture assembly
2.1 Establishment of 3D graphics library based on SolidWorks
SolidWorks is a fully Windows-based 3D CAD/CAE/CAM software that is widely used today. It uses the same underlying graphics core Parasolid as UG, with powerful feature-based parametric solid modeling capabilities to perform complex product design and product assembly processes. SolidWorks provides users with a powerful secondary development interface through OLE (Object Linking and Embedding) technology. Any development tool that supports OLE programming can be used for secondary development of SolidWorks to create customized modules for users.

A fixture graphics library refers to a collection of sub-graphics for fixture design in a certain form. The graphics library of the system mainly has a graphic library of common parts (screws, nuts, etc.), a graphic library of standard parts (positioning elements, clamping elements, guiding elements, originals of the tooling) and a graphic library of common parts of the enterprise (clip specific). Its function is to enable the fixture system to assemble a fixture assembly drawing that meets the requirements. The fixture graphics library is the key to establishing a three-dimensional CAFD system. The fixture graphics library structure is shown in Figure 2.

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Tension Spring

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