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

Dog house-

• Dog house is an engineering feature used in plastic design . Dog house are used as support feature.

Design -

• Class A surface is given by styling team and this part gives to design engineer to create part with engioneering features.
• Tooling Axis we need to take specifically and check draft anaylisis and take best tooling axis by adjusting compass.
• Class B surface we need create from Class A surface by offsetting class A surface below a certain thickness . Offset can be done as per requirment . Usually offset value is 2.5 mm inward direction.
• For class B surface creation we need to check discontiunity and work on the offset surface by operations like extract , multi section surface , extrapolate , trim and split etc.
• There should be no any gap in class B surface .
• Class C surface will be created in class A surface by sweep operation which join class A and class B surface.Sweep can done as per requirement like with referance to surface or with referance to tooling axis and sweep angle will be provided .
• For Creating final trim join class A and Class C surface together. and there should be no boundry in this join.Extrapolate class B surface and this class B surface should intersect with join class A and C. For ensure we should take intersection betwen Join and class B and make sure there should be no any black mark . it means there is still gap or surfaces are not intersecting with each other.
• Now, trim this updated class B surface with join ( class A and class C).
• verify if there is still any boundry and no boundry should be present . Make this part as solid by closing the surface.

Dog House Creation-

Dog house are designed to avoid Sink marks created on the class A surface by screwboss and to solve length issue.Its also helpful when perpendicular screw bosses are required.

Parameters-

C thickness should be 40% of the main wall thickness T.

Minimum width of the dog house is 12 mm.

Height should be 3-6 mm.

Minimum draft would be 5 degree.

• First we need to create side core axis and probebly chosen point direction.Create sketch on plane required by using extrude or sweep operation to create outer wall. sketch should be positioned and iso constrained.
• After close the top surface using multisection solid method. Using thicken command generate solid part of the dog house .
• Give proper draft angle and provide fillets as per design rules.
• By boolean operation , union trim the dog house body with part body ( Door trim component).

DRAFT ANAYLISIS-

• Draft anaylis is command which enable to detect if the part drafted is easily removed . This draft anaylis is perform based on colour range identifying zone.
• Draft analysis is done after determining the tooling axis whether the minimum draft is maintained or not.

Colour range-

Green colour- Positive Draft

Red Colour -

Blue colour- Negative Draft.

CONCLUSION-

Successfully created class B and C surface by given class A surface of the door trim created main and side core axes.Performed Draft analysis the final part and dog house.