The task of this exercise is to generate the 3D model of the butterfly valve assembly shown in Figure 1. The butterfly valve consists of the following eight components:
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Body; Arm; Shaft; Retainer; Plate, nut, and screws (x2)
The orthographic views (including all the necessary dimensions) of the above components are shown respectively in Figures 3 to 7.
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The first step is to create the individual components. The 3D model of the screw and of the nut will be provided and have to be inserted in the assembly module. The 3D model of the other components must be created from scratch in the assembly module. As a result you will be using both the bottom up and top down assembly approaches.
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Following are the steps that you need to follow to complete the assembly, once all the components are inserted/created in the assembly module: 1.
Assemble the shaft and the body using first the insert and then the angle assembly constraints. To apply the insert constraint, select the faces shown in Figure 8a, whereas to apply the second constraint select the flat face of the shaft and the top face of the body (see Figure 8b). The angle between these two faces should be 45°. The flat face rotates towards the right side;
2.
Assemble the retainer with the body, using the insert assembly constraint twice. The faces to select when applying these two constraints are depicted in Figures 9a and 9b;
3.
Assemble the arm with the body, using the insert assembly constraint. Select the faces shown in Figure 10a. Apply the angle assembly to have the arm at an angle of -135° with respect to the body. To accomplish this, select the top face of the body as the first face to apply the constraint. The second face to select must be the XZ plane of the arm. To view this plane click on the + sign located on the left of the arm in the model tree and select the XZ plane. The resulting 3D model after completing this step is shown in Figure 10b;
4.
Turn off the visibility of the body (refer to Figure 11a) and assemble the plate with the shaft. To accomplish this assembly operation choose the hole features in the shaft and plate as shown in Figure 11b;
5.
Insert the screw and nut by using the place component feature in the assembly module. Copy
__________________________________________________________________________________ Dr. Ing. Philip Farrugia
__________________________________________________________________________________ the screw to have two screws ready for assembly in the subsequent steps; 6.
Assemble the nut with the shaft and the two screws with the shaft and plate using the insert constraint in both cases;
7.
Turn on the display of the body and the arm. The final assembly is shown in Figure 1.
Figure 1 – 3D model of the assembled butterfly valve
Figure 2 – 3D model and orthographic views of the body
__________________________________________________________________________________ Dr. Ing. Philip Farrugia
