Week 9 - Attachment Feature Creation - Challenge 2

Week 9 - Attachment Feature Creation - Challenge 2

Aim- Create the Dog House for the Door Trim considering the design rules mentioned in the video. Consider the thickness of the part to be 2.5 mm.

Objective :

• Create the Tooling axis by using the bisecting method.
• Design the class-B and class-C surfaces and join them.
• Create the solid feature by surfaces we create.
• Design the required Dog House and analysis them.
• Perform the Draft analysis for the final component.

Theory :

Tooling Axis :

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

Step followed for the creation of tooling axis :

• Reference point is first created on the extracted surface.
• New axis system is deployed to plot clearance lines.
• The X-direction and Y-direction along the class-A were used to create the tooling axis.
• Graphic properties of the tooling axis were changed before publishing.

Draft Analysis :

The Draft angle is the amount of taper for molded or cast parts perpendicular to the parting line. It can be measured in degrees. A functional part for injection molding has to have Drafts facing both cavity and core sides to reduce the risk of damage to the parts and ensure ejection. And also important is to overcome the vacuum forces by letting air in between the metal to the plastic for the part to release properly. Adding maintaining a decent cosmetic finish.

The draft should be a part of the design for manufacturing and the plastic product Designer should be aware of its need at the outset of the design process. This allows considerations for design requirement's to be taken into account.

Nominal values for Draft angle :

• 3 Degrees is the nominal Draft angle.
• A minimum of 1.5 Degrees can be manufactured with special tools. But it will increase the manufacturing cost.

Tooling axis creation :

The first step is to observe the given class-A surface deeply and we can say the larger flat area which is perpendicular to the Tooling axis. So, by considering this thing for this class-A surface tooling direction will be in the X-direction. so we create the point on the flat surface as shown in the figure.

Create the Dog House for the Door Trim-

"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

Conclusion :

Hence the Rib for the drill handle considering the design rules for Door Trim-Dog House creation & also done Draft analysis @ 1.2Dgr its look fine most of the area but in some point it will getting fail show in img.

END OF REPORT.......