Week 9 - Attachment Feature Creation - Challenge 2

TREE STRUCTURE:

VIEWS:

REPORT:

SCREW BOSS AND DOG HOUSE DESIGN ON COIN HOLDER

AIM:

Create the screw boss and dog house for the centre console coin holder considering the design rules mentioned in the video.

General Rules for Screw bosses:

Draft of 0.5 degree on walls of boss.

Thickness is 40% of the nominal wall at the base.

Height to diameter ration-3:1.

Fillet radius of max 0.25 mm.

C is where the doghouse contacts the back side of the surface.

Doghouse wall thickness at the intersection of the part wall (C) should be 40% or less than the main wall stock (T).

Height of (B) should be between 3.0-6.0 mm.

Screw boss design:

Screw boss can be on B surface or it can be on dog house in this we are mounting it on dog house. Draw circular sketch inside circle of diameter 5mm and for outer circle wall should be 0.6°T on one side so outside diameter = 2(0.6*2.5)-5(inside diameter)-8mm.

Pad it with main tooling direction considering height to diameter ratio of 3:1

H=B*3=5*3= 15mm.

Give draft of 0.5 degree with tooling axis.

Now to support the screw boss we need to give ribs for it.

Draft to ribs of 0.5 degree.

Do union trim with screw boss.

assemble the coin holder to main body,translate it also.

DOG HOUSE DESIGN:

Extract the base of Class A Surface and offset it with part thickness as 2.5 mm.

Draw sketch of rectangle and should be open from one side for dog house.

Using sweep with tooling direction and draft it at an angle of 1.5 degree for outer surface.

Close the upper surface face by offsetting the below extracted surface and then after trimmed it.

Convert the dog house surface in thickened surface by applying part thickness as 2 mm.

Now for the inside faces of dog house we need side core tooling axis created it in Z direction.

Give draft to the inside surface of 0.5 degree.

Now to create the C and B section as shown in design rules, offset the base surface in between 3 to 6 mm.

Extrapolate the surface to achieve desired length. Switch to part workbench and split the C and B Section with thicken part.

Again, provide draft to the inside surface as shown.

Give radius/fillet to inside as 0.4*T-0.4*2.5-1mm and for outer edges give fillet as inside radius+ part thickness.

Finally assemble the dog house to main body{COIN HOLDER}.

PROCEDURE FOR DRAFT ANALYSIS:

1. Changing view mode to material mode in Mesh.
2. Toolbar-Insert>Analysis>Feature Draft Analysis
3. Drag the compass from dialogue box to the Tooling axis and place properly.
4. Click anywhere in the component and click ok.
5. Analysis the colour of failing and passing surfaces.
6. Gren colour means draft is up to the desired and component is ready for manufacture
7. Blue means zero degree and red means below zero degree(Because of reverse direction).

DRAFT ANALYSIS OF SCREW BOSS :

DRAFT ANALYSIS OF DOG HOUSE:

DRAFT ANALYSIS OF FINAL COMPONENT:

CONCLUSION:

Creation of screw boss and dog house on Coin Holder has been successfully done by following all the design rules and the Tooling axis has been created following OEM standards.