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

Dog house design for the Door Trim:

Aim: Create the Dog House for the Door Trim considering the design rules and perform the draft analysis for class A and create the final close body component and perform the draft analysis.

Objective:

• Create the Tooling axis
• Design the class-B and class-C surfaces and join them.
• Use the Close Surface feature to make a solid body from the surface.
• Design the required dog house and analysis them.
• Perform the Draft analysis for the final component.

GIVEN CLASS A SURFACE

Tooling Axis :

Class-A surface is first analyzed to create the tooling axis. where the molds pull apart in injection molding. Tooling direction is essential for plastic product design as it decides the direction for mold separation.

To create the tooling axis first we have to check the best suitable direction for tooling by using the compass. the y direction is suitable for creating the tooling axis because in the y direction most of the surfaces are clearing while performing draft analysis. Generally tooling axis is created using bisecting line method but here A line normal to the surface is created in the y direction and considered the tooling axis.

Y direction

Draft analysis of Class- A

After creating a tooling axis we do the draft analysis. Before drafting we have to make sure that in the view mode it is selected for the materials.

After selecting the feature draft analysis tool we drag the compass from its position to the tool axis. Then lock the compass. After that select anywhere on the component and it will give you the result.

We change the minimum draft for the component to 3°.

We can use the running point option to check the angle of the component.

CREATION OF CLASS B SURFACE:

In this component Creation of the class B surface first, we have to offset the entire model by 2.5mm outward some of the surfaces give offset error and ask for offset without these subelements click okay and work on the incomplete surfaces by using the multi-section surface command, sweep and different commands used to complete the class B surface.

Incomplete surface gaps in the offset. so we work on the surfaces and ensure that there is no gap in the class B surfaces.

Class B surface

CREATION OF CLASS C SURFACE:

We first extract the edges from the Class A surface with the help of the multi extract or boundary command which we create the path for a sweep for class C

like this, we have to create all separate sweeps and join them together. once all the sweeps are joined together we created a class c surface.

Joining class A surface and class c surface together

Then trim the class-B surface to join (A+C) this will make sure that we get a closed surface. We can check it using the boundary tool, if it gives an error that means that the component is closed.

Then We go to the part design workbench and use to closed surface tool to create a solid body.

hence, we created our final Solid component.

DOG HOUSE DESIGN:

Dog house: Dog house is an engineering feature used in the plastic trim design. Dog houses are used as supporting features. Sometimes other engineering features like snaps; locators, etc. are mounded on them to increase their strength. Dog house and other engineering Features are built on B-surface.

Design rules for Dog house creation

"C" is where the doghouse contacts the backside 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 ).

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

Dog house design procedure by considering the design rules:

Extract the surface on which we want to create the dog house and create a sketch on a plane

Dog house Sketch

Now we have closed the upper surface of the dog house by extruding and trimming features.

2mm thickness has given to the surface by using a thick surface feature

Now apply the fillet value to the side wall and outer edges

Side core tooling axis creation:

side core axis is created in the x direction on the same point as the main tooling direction created

Give the draft angle to the inside walls and pull direction as the side core axis

The height of ( B ) should be between 3.0 – 6.0 mm by considering the design rule

here we offset the class b surface to 4mm

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

we offset the 1mm from the side wall by considering the design rule

Now we trimmed the surfaces and split the surface with the part body

Now apply the draft on the inside edge where the bottom cut is done

Apply the fillet to those edges

finally, The dog house is created by considering the design rules.

Following the same procedure, we designed another dog house on the door trim in the required position

Draft Analysis on the final component :

1. The part created has to be changed to the material mode in the display frame.
2. Compass is enabled and aligns it along with the tooling direction.
3. The lock command is then applied to fix the compass along with the tooling axis.
4. Color codes are classified and Draft angle is applied.
5. Running point analysis is used to display permissible draft angles.

Draft analysis on the dog house considering the side core axis as our tooling direction

Draft analysis of final component considering the main tooling axis as the tooling direction

ISOMETRIC VIEW

FRONT VIEW

SIDE VIEW

TOP VIEW

Conclusion :

Hence, the dog house for the door trim was created by considering the design rules, and the Draft analysis performed on the final component is successfully done.