Week 8 - Challenge 1 - Base Bracket Design

DESIGN AND DRAFT ANALYSIS OF BASE BRACKET

Class A surface

Draft analysis

Draft analysis is done to check plastic parts moldability for the ease of removal from the injection mold. A tooling direction is required to create the draft in the component, which acts as the drafting direction.

Tooling direction

• Considering the ejection from the cavity of the mould after manufacturing the interior trim must have the nominal 3-degree draft angle (minimum).
• Hence the tooling direction is created by considering the above factor and bisecting method is used.
• The Center point of the hole in class-A was made and a plane is created at the point.
• Then intersection of the Class A & yz plane is created and the two inclined lines were
• Then bisector line of the two inclined lines is created, which is defined as the Tooling axis.

Procedure for Draft Analysis

• The draft analysis tool is selected.
• Then by enabling compass the axis system is aligned in line with the tooling axis, to define the draft direction.
• Now the surface or part which should be subjected to draft analysis is selected.
• Lock Direction is applied that fixes the compass and then the mode dialog box is formed by snapping at any point on the part
• The Color Codes are classified and Draft Angles are applied
• Then the Running point analysis is used to hover around the part to analyze the permissible draft angles and the analysis is saved.
• This gives the result of the surfaces which have positive draft in green code.

Draft Analysis of Class A

Class B surface

• For creating the class B surface the required surfaces from Class A are extracted and then untrimmed.
• Then all the surfaces have been extrapolated to get intersections between them and then trimmed.
• Since the thickness of the Base Bracket is 3 mm the trimmed surface was offset to 3 mm.
• Finally, the required corners have been filleted to finish Class B surface.

Class C surface

• The required boundaries of the Class A-Surface were extracted and smoothened.
• Then the curve swept with reference to the Tooling axis as draft direction with draft of 3deg.

Final part

• Class A and Class C surfaces were joined together, and then trimmed with Class B surface to form a closed part.
• Then the closed part is made solid by Close Surface option to create the body of Base Bracket.

Draft Analysis of Base Bracket

Feature tree & Publications

CONCLUSION

The Class B & Class C surfaces and the Tooling Direction have been created and Published and the Base Bracket part body is developed. Both the Class A surface and the Solid body have been successfully passed the Draft Analysis.