Week 9 - Attachment Feature Creation - Challenge 2

DOOR TRIM DESIGN WITH DOG HOUSE

OBJECTIVE: The main aim of this challenge is to create Dog house features of the 'Door Trim', with the help of CATIA V5.

CLASS A SURFACE

We get class A surface as a input. we create B surface and C surface using this class as a refference.

TOOLING AXIS

To create the tooling axis, I extracted a surface from class A and created a point in the middle of the surface by using the point command and created a line at that point through the y-axis. Now, I performed a draft analysis check from that line whether the created tooling axis is in the correct position or not. If, in the draft analysis check the surface highlighted with green colour on both sides of the surface the tooling axis is in the correct position and direction.

DRAFT ANALYSIS OF CLASS A

Now, I performed a draft analysis check from that line whether the created tooling axis is in the correct position or not. If, in the draft analysis check the surface highlighted with green colour on both sides of the surface the tooling axis is in the correct position and direction.

some faces of class A surface has less than 1 degree draft ,it may leads manufacturing deffects.

B SURFACE CREATION

To create the class B surface, offset the class A surface inside by 2.5mm thickness. Once the offset is created, we can observe some patches on the offset surface, those patches are formed due to the fillets on the class A surface. We need to fill those patches with the help of the multi-section surfaces and sweep commands by extracting the patch boundaries. Once all the patches on the offset are covered properly join all the patches with the offset surface, to get the replicated surface of the class A surface.

Patches to be filled

Filled patche

C SURFACE CREATION

Get the boundary lines of Class A surface separately.Smooth the curves with a smooth option as boundary lines have a lot of vertices.Sweep the curves with tooling axis as direction in Sweep option.As both lines do not intersect, extrapolate them with a certain distance.Trim the surfaces.

CLOSED SURFACE

Join the Class A and Class C surfaces.Trim those joined surfaces with Class B surfaces.Go to Part Design and insert a Body and create a closed solid body from closed surface.

DRAFT ANALYSIS

Go to the Insert menu and select the Analysis option.Select Feature Draft Analysis.Select the Material option and select the surface.Drag the compass and place on tooling axis.Make sure that the top surface is in green colour as draft angle should not exceed 3deg.Click on Okay after confirm the model.All faces will be green with 2.8 degree draft.

Because of less than 1 degree dtaft on cass A surface the solid body also have same draft value.

DOGHOUSE CREATION

The dog house is an engineering feature used in the plastic trim design. Dog houses are used as a supporting feature. Sometimes other engineering features like snaps; locators, etc. are mounded on them to increase their strength.

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

• 2.5*0.4 = 1 mm

• The height of ( B ) should be between 3.0 – 6.0 mm

DRAFT ANALYSIS OF DOGHOUSE

IMAGES OF DOOR TRIM WITH DOG HOUSE