CATIA-Week 8.1- Base Bracket Design

AIM:

Create the Base Bracket Plastic component using given class-A surface, create a tooling direction and perform draft analysis on the model.

OBJECTIVE :

• To ensure that the model fulfils the draft angle criteria.
• To make a tooling axis, use the bisecting approach.
• Draft analysis must be performed on the provided Class A surface.
• To create the necessary Class B and Class C surfaces.
• Using the Close Surface feature, create a solid body from a surface.

CLASS A SURFACE :

• Class A surfaces are those surfaces which are curvature continuous while providing the simplest mathematical representation needed for the desired shape and does not have any undesirable waviness.
• The Class A surface is the used to begin the design of a product.
• All the further intricacies of the component are created based on the Class A surface.

CLASS B SURFACE :

• The Class B surface is created from the Class A surface , keeping the thickness of the component in check.
• The Class B surface resembles an offsetted surface from the Class A.

CLASS C SURFACE :

• The Class C surface is used to bind the Class A and Class B surface together inorder to form a closed surface.

PROCEDURE :

Creating Tooling Axis

• Initially the given Class-A surface was imported and checked for any discrepencies in the boundary.
• A dummy Tooling axis was created using a reference point created on a hole of the given surface.
• The lines which might cause trouble during the operation were identified and a reference line was created for each of the identified lines.
• Finally a Tooling axis was created from these two reference lines using Bisecting option.

Draft Analysis

• The Drafting analysis was performed using the Feature Draft Analysis command.
• Using this command the compass was set on the main tooling axis and the Draft angle was changed to 3 degree.

Creating Class B Surface

• Initially the ribs were created from the Class A surface.
• The required surfaces were obtained from the Class A surface using Extract command.
• These surfaces were further expanded using Untrim and Extrapolate commands.
• The protuding surfaces were trimmed using the Trim command and a proper continuous surface was obtained.
• The same procedure was followed for the other side aswell.
• These surfaces were offsetted according to the required thickness of the component.

• Further the base and the inclined surface of the component were obtained from Class A in the same manner.
• These surfaces were offsetted accordingly and trimmed with the ribs, forming a proper Class B.

• Finally all the necessary fillets were added to the Class B surface.

Creating Class C Surface

• The Class C surface connects the Class A and Class B surface.
• Initially the outline of the Class A surface was obtained using the Boundary command.
• The the Sweep command was used along With draft direction, with a draft angle of 3 degree.

• Further the holes presented in the surface were created in the same manner.
• All the swept surfaces were finally attached to the Class A surface using the Join command.

• Finally all the 3 surfaces were trimmed to form a closed surface.

Creating Solid Body

• Using the surface created the solid component was obtained using the Close surface feature present in the part workbench.
• The Tooling axis, Class A, B and C surfaces were published.

Draft Analysis on Final Part

MODEL RESULTS :

Feature tree

Front view

Top view

Side view

Isometric view

CONCLUSION :

• The creation of Tooling axis and Draft analysis were performed.
• The solid component was created from the surface geometry.
• The necessary screenshots and files were attached.