Week 9 - Attachment Feature Creation - Challenge 2

Report

Draft Analysis is very usefull tool to analysis the draft value of plastic components as well as sheet metal components. In molding process, no part can ejected from the tool if it is having a straight 90 degree profile from its base surface.so, we provide small angle to each and every area of the component to get an easy removal of the component from the tool. Draft analysis technique is used to analyze whether our part model created in cad is manufacturable based on the draft condition applied.

In this Switch Bezel components we check the draft analysis of given class-A part. for analysis draft firstly check the which plane is suitable for molding then after we draw tooling axis.

Process to draw Tooling Axis:-

• Extract the base surface of switch bezel.
• Untrim the extract surface.
• Pick the point on the surface with zero co-ordinate.
• Draw the line in this point in Y direction that are our tooling axis.
• Draw the line in this point in Z direction that are our Side Core tooling axis.

Class A Draft Analysis

After creating tooling axis, we perform draft analysis.Draft analysis workbench available in part design, Generative shape design, wireframe and surface for building and free style shaper workbench. Draft Analysis workbench available in Insert>Analysis>Draft Analysis. Firstly change the view mode to customize view parameter and select material option from the mesh and select material. After That Drag the axis simble and fited in the tooling axis. Two sub window pop up one is for draft deviation colour bar and second is menu bar. Green colour part represent ok for manufacturing but second side show blue that mean need to thick the part so we we create B surface and C surface then we make solid using close surface operation after that we check draft analysis one more time like class A.

Screw Bos Creation

Screw boss are used to connect two part using srew bolt. In the designing of screw boss we conside some important point. It is part of main body. there are following rules while desinging scew bosses-

• Draft - 0.5 degrees on walls of boss.
• Thickness-Typically 40%* of the nominal wall at the base.
• Height to Diameter Ratio - 3:1
• Radii - 0.25mm maximum radii.
• Boss Gussets
• Coring Out Bottom
• Planning ahead for type of ejection.

DogHouse Creation

Screw boss are directally connected with main body and There is always a danger of getting a mark.So to avoid this, Doghouse is used.Its required side core tooling axis beacuse main tooling are not clear it.There are following point are important while designing doghouse-

• Draft -Minimum 1.5 Degree
• Reduced Wall Thickness- 40% or less main wall stock.
• Slot Height- 3 to 6 mm.
• Width - Minimum 12mm.

After creating it, we perform seperate draft analysis using side core tooling axis.

Final Draft Analysis

Isometric View

Front View

Side View

Top View