Week 10 - Challenge 2- Attachment Feature Creation (Dog House)

AIM:

To Create thethe Dog House for the Door Trim considering the design rules mentioned from the given Class-A surface.

To Create the tooling axis for the given Class-A Surface meeting the requirements of the draft angle.

To Attach B side features in the component.

To perform the draft analysis on the model.

TOOLIS USED:

Boundery

Join

Multiple extract

Trim

Surface offset

Draft analysis

Intersect

Surface sweep

Close body surface

DESCRIPTION:

CREATING TOOLING AXIS :

The Tooling Direction is basically the direction that the mold pulls a part. The mold is built in two separate piecs,basically. You have a Cavity side and you have the core side. The Core pulls apart from the Cavity and that's the dye line or the tooling direction.

Opwn the given CATpart file.

PUBLICATION :

Publication is done to the component to make it visible and navigate easily.

To publish the component go to tools> publication and then select the tooling axis and the class A surface.

A separate tree structure is formed under the main part.

DRAFT ANALYSIS:

The Draft Analysis command enables you to detect if the part you drafted will be easily removed. This type of analysis is performed based on color rangs identifying zones on the analyzed element where the deviation from the draft direction at any point, corresponds to specifid values .

Before going to draft analysis go to customized view parameter > under mesh>check material and then click ok.

In the colour scale change the draft angle 3 degree.

The component changes to green in in dication of passing draft angle.

Use running point to check the angle on the component.

The draft analysis is complete

CREATING CLASS B SURFACE

Extract the surface from the class A using multiple extract and untrim them.

use Extrapolate to make sure that all the untrims are properly intersected to trim and offset the surfaces to 2.5mm to create the thickness.

Trim the extra surface using trim command

Apply fillets to the model after creating the entire surface.

If the edges are outside the fillet value will be added to the thickness of the component and if the edges are in side, the fillet value will be subtracted from the thickness of the component, for instance the thickness fo the component is 2.5mm the fillet value is 15mm so the outside portion value should be 17.5mm and inner eges shuold be filleted 12.5mm to get uniform thickness.

perform trims one at a time so that it will be clear to understand.

REATING CLASS C SURFACE

Extract the boundary from the class A surface using boundary command.

Using disassemble tool to divide the boundary as the boundary contains domains.

Use sweep command> choose profile type line >subtype as with draft direction> choose guide curve >draft angle as 90 degree> preview.

JOINING CLASS A AND C SURFCES

TRIM A+B & C SURFACES

CREATING SOLID MODEL BY USING CLOSE SURFACE IN PART DESIGN :

Dog House Design

Dog house is an engineering feature used in plastic trim design. Dog houses are used as supporting feature. Dog house is a feature that helps

you to avoid sink marks.

Rules

Dog house wall thickness and sink saver-

"C" is where dog house contacts backside of surface.

Dog house wall thickness at intersection of part wall C should be 40% or less than main wall stock.

Height of B should be between 3.0-6.0mm.

Dog house

Dog House height H of Dog house is 6mm.

Less than 6mm causes weak steel condition.

3:1 ratio of steel width to height, 2:1 is perferred.

Dog House width

Minimum dog house width X for dog House is 12mm.

3:1 ratio of steel width to height, 2:1 is perferred.

Dog House Draft to die Draw

Minimum Draft for dog house 1.5 degree to die draw.

If a slide is being considered, this requirement can change to 3 degrees minimum.

Sketch Used For Screw Boss Creation.