Week 9 - Attachment Feature Creation - Challenge 2

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.

INPUT

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.

Draft analysis of Class- A  (To Check tooling Axis Correct )

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

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.

Final body Surface

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 

Sweep the sketch along tooling Axis

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

Draft analysis of dog box

Along tooling Axis

Along Side core Axis

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 of Part body 

Tree Stracture 

Tooling Axis                                        

 

Surface B 

    

Surface c

Dog House 

 

Part Body 

Measurement of fillet 

Draft Analysis And Publication

Drawing Views

Isometric view

Front View

Side view

Left Side view

Right 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.