Fixture structure design
Positioning design
First call the positioning component in the fixture component graphics library, and select the parameter specifications according to actual needs. See Figure 5. The positioning member 1 completes the design of the positioning surface 1, and the positioning member 2 completes the design of the positioning surface 2. The positioning member 3 completes the design of the positioning surface 3. The main dimension of the positioning member 1 is designed by the sum of the outer diameter of the flange and the outer circle of the positioning member 2. The positioning member 2 and the positioning member 3 are designed by reference to the positioning surface 2 and the positioning surface 3, as shown in FIG.
The center distance of the guide is from the center hole of the flange of the pipe joint. The size of the guide structure is determined by the size of the hole on the flange and the standard structure of the clamp. According to the processing requirement, the guide member axis is perpendicular to the positioning surface 1, and the guide member is mounted on the positioning member 1.
Clamping device design
The clamping element is shown in Figure 7, and the clamping member 1 and the clamping member 2 complete the clamping of the clamping surface. With the pin shafts 1 and 2 as the support members, the clamping member 1 and the clamping member 2 rotate around the pin shaft, and the adjusting nut of the clamping member pushes the ball pin, the flat pin and the steel ball as a force-transmitting mechanism to realize clamping of the workpiece. , achieve the return position under the action of elasticity. The above parts are designed with the new internal parts in their initial structure and size. If there are fixture components in the fixture component graphic library, they can be retrieved from the graphics library, and similar components can be transferred and edited to the required ones. Components. Considering the installation and positioning of the clamping force mechanism, a mounting hole for the steel ball, the ball pin and the flat pin is arranged on the positioning member 1, and a spring mounting hole is designed on the clamping member to complete the preliminary design of the clamping mechanism.
On the basis of the preliminary design, considering the installation and positioning of the positioning member and the clamping member, the design clip is specific. For other parts to be mounted on the clamp and mounted on the drill bed, it is necessary to make screw holes, pin holes, etc. on the clamp. The positional dimensions of these holes do not need to be calculated, using MDT's unique function of splitting parts directly from the designed fixture parts. The locating pin and the pin and shaft of the pin 1, 2 are designed according to the generated part, the clip specific part, as shown in FIG.
Assembly design
The required fixtures, such as screws and nuts, are loaded into the fixture component library, and the designed parts and the transferred components are assembled by MDT assembly constraints, and the three-dimensional assembly design of the fixture is completed. After the design is completed, all fixture components, standard parts, and the like are externalized to become part files.
5 Conclusion
The universal fixture CAD system is a parametric graphical information management system for fixture designers, which integrates the database operating system and the parametric graphics system. This paper introduces in detail the design process of the universal fixture CAD system based on solid modeling in the MDT 3D software environment. A design method for performing fixture design under the system is provided by a specific example.
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