Week 8 - Challenge 1 - Draft Analysis on a Fan Cover
Draft analysis:
The draft is provided in the plastic parts to avoid the damage of parts during ejection after complete solidification of the molded part. The frictional intraction between the core plate and the molded part could be reduced easily, so that the molded part could be ejected easily with less force by ejection pin.
Sketch of Draft in Part
Report on draft analysis procedure and purpose:
1. Surface continuity check with join, disassembly and boundary surface commands.
2. Identifying the prefered tooling direction for making the mold set up.
Tooling Direction along XY-Plane
3. Create the dummy tooling axis. The dummy tooling axis helps us to have a note on directional positioning of the part with respect to entire automobile assembly.
Dummy Tooling Axis
4. Identify the parallel surfaces which acts as an intraction between the part to be manufactures and the core, cavity plate. For smooth ejection with minimal friction and force after molding.
Frictional Surface
5. Create an intersection sketch inorder to make an proper alignment on tooling axis orientation by creating the bisecting sketches.
Main Tooling Axis
Tooling Clearing X&Y-Axis
6. The draft analysis is created inorder to design the part properly, which could be suitable for manufacturing. If proper draft is not provided then the molded part could be hard to get ejected or could be ejected with damage.
Draft Analysis
7. In draft analysis red colour code is nutral draft (0 to 0.5 degree), blue colour code is negative draft (negative degree's), and green colour code is positive draft (0.5 to 3 degrees and above).
8. The required draft is considered to be between 0.5 to 3 degrees, but the negative and nutral drafts are used in circumstances which could not be avoided for manufacturing.
Colour Codes
9. Based on the type of draft and angular orientation, the manufacturability of the part is desided. If the part is not manufacturable the changes are made in the model inorder to make the part manufacturable.
10. Incase if there is a need for negative and nutral drafts then aditional mold set up requirements like lifters has to be used, which may increase the cost of manufacturing and production.
Front, Top, Side and Isometric view of Draft Analysis