Draft Analysis on a Fan Cover using CATIA V5
AIM : To perform Draft analysis for given fan cover in CATIA V5.
Draft : Drafts are defined on molded parts to make them easier to remove from mold.
Drafting methods:
- By explicitly selecting the object.
- By selecting the neutral element
Major industries uses minimum draft angle of 3mm for plastics.
Procedure for draft analysis
- First we check the contuinity of the given Class A surface.
- Check the three directions(X,Y and Z) and decide which is the best possible direction to produce a mold.
- A fan with several drafted surfaces that is oriented in part location. That the draft analysis initially assumes a Z-axis direction.
- At Z-axis direction the faces are either positive or negative draft so the Z-axis we taken as dummy tooling axis. We need to create a perfect tooling axis.
Tooling Axis creation
Tooling axis: Direction in which mold opens or core and cavity opens.
Fig: Fan Cover
Create a point at center of hole.
Create a axis system on a point.
Create a intersecting line along ZX plane on class A surface.
Extend the line that you want to create tooling axis with respect to that line.
Create a bisecting line that is called as tooling clear in X direction with respect to extended line.
Follow the same procedure to create tooling clear in Y direction in ZY plane.
Create a Bisecting line with respect to tooling clear line in X and Y direction. This is true Tooling axis for the model.
Lets do draft analysis
Change the shading style to "shading with material".
Now go to insert>analysis>Feature draft analysis.
Now select compass icon in draft analysis dialogue box and drag the compass and place it on tooling axis and select lock draft direction option.
Now swith to quick analysis mode to see whether the surfaces are passed draft angles or not.
To check draft angles of the surfaces individually select "Analysis under the running point".
CONCLUSION:
The tooling axis for the given fan cover is successfully created and Draft analysis is performed for the same.