Challenge

Week 8 - Challenge 1 - Draft Analysis on a Fan Cover

AAswin Asok8 Jun 2022

AIM

Create the tooling axis for the given Fan cover model meeting the requirements of the draft angle and perform the Draft analysis on the model.

THEORY

For any plastic component to be designed using injection molding a slightly tapered surface needs to be provided for smooth movement of the product after it is manufactured inside the core and cavity.

TOOLING AXIS

Tooling Axis is the direction in which the Mold opens and closes. Part Drafts are given along this axis.

DRAFT ANALYSIS

Draft Analysis is a tool in CATIA which identifies the zones which deviates from the specified values of angles along a defined draft direction using colour codes. It highlights the regions of draft using colours. Draft analysis is the first step performed after receiving the Class A of the component.

PROCEDURE

Checking discontinuity

The dicontinuity in the model is checked by using join, boundary option.

Creating point

A point is created in center of hole by using point tool and hole as reference.

Creating Axis system

In order to create a tooling axis clearing the direction first which needs to create a Axis system at the center point(reference point).

Intersect

Now using the inetersect option on the toolbar, select the ZX plane iof the Axis system as the first element and fan cover or class-A surface as the secont element. This will give A 2D skecth of fan cover viewing from X direction.

Creating a dummy tooling Axis

Using line tool a dummy tooling axis is drawn along Z direction.

Creating lines that representing the walls of fan cover using point to point in the line

Creating Tooling clearing X direction

Using the 2 lines, create a tooling axis clearing the X-direction. Create a line that bisects these two lines from the reference point in the Z-direction. This will create a tooling axis clearing X-direction.

Intersect on YZ plane

Using intersect option select YZ plane in the Axis sytem which will give outer lines of the model in the Y-direction.

Creating line on side walls

Same as before create two lines from the points on the side lines of the sketch using point to point in line command.

Creating Tooling clearing Y direction

Similarly create a tooling axis clearing Y direction using same bisecting method as before.

Final tooling axis

Now create the final tooling axis in the Z direction for Fan cover using bisecting taking both X and Y direction clearing axis as reference in the line.

Draft analysis

To perform draft analysis on the model:- Go to menu bar > select insert > Analysis > Feature Draft Analysis. To give the draft direction, use the compass and align Z-axis of it with the tooling axis. Once it properly aligned, lock the draft direction. A red point shown ion the screen, select Fan cover and it will show us the current of the model. Then go to display tab on draft analysis and select show Colour scale option and it will show the draft value. Set the Draft value to 3 deg under the colour scale variant and press ok.

Publication

To publish the Tooling Axis and the Class-A Surface first select it and the go to menu bar > Tools Publication. This will publish the tooling Axis and fan cover which can be seen in the tree structure.

VIEWS