Week 9 - Attachment Feature Creation (Ribs & Screw Boss) - Challenge 1

AIM:
Create the rib for the Drill Handle considering the design rules mentioned in the video.

To design ribs on the coin holder considering every RIB design rule in the industry. THEORY: Class-B surface contains all the engineer data required for the model to be completed. Some of the major features of the B-side are: Ribs Screw boss design DRAFT ANALYSIS Draft analysis

Class-B surface contains all the engineer data required for the model to be completed. Some of the major features of the B-side are:

• Ribs
• Screw boss design

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 Ribs and Screw Boss and analysis them.
• Perform the Draft analysis for the final component.

STEPS TO BE FOLLOWED :

• Creating the tooling axis
• Draft analysis of Class A surface
• Creating Class B surface
• Creating Class C surface
• Close Surface and solid body
• Draft analysis of Solid body
• Engineering features Rib and Screw boss
• Draft analysis of Solid body with engineering features
  
  
  

CREATING THE 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.

• First check the connectivity of the given Class A surface by using the Boundary or Join feature to visualized and repaired the open edges of the surface.
• And then, analyse visually the best suitable plane or surface for tooling axis.
• First check the connectivity of the given Class A surface by using the Boundary or Join feature to visualized and repaired the open edges of the surface.
• And then, analyse visually the best suitable plane or surface for tooling axis.
• Create a line at the centre points by using normal to surface type from line feature.
  
  

DRAFT ANALYSIS OF CLASS A :-

The Draft Analysis command enables you to detect if the part you drafted will be easily removed. This type of analysis is performed based on color ranges identifying zones on the analyzed element where the deviation from the draft direction at any point, corresponds to specified values.

• Before going to drat analysis go to customized view parameter >under mesh >check material and then click ok.
• Now for draft analyses go to insert » analysis » feature draft analysis.
• Use the compasss to define the draft direction.
• In the colour scale change the draft angle to 3 degree.
• The component changes to green in indication of passing draft angle.
• Use running point to check the angle on the component.

CREATING CLASS B SURFACE:-

• Extract the surfaces from the class A using multiple extract and untrim them.
• Use Extrapolate to make sure that all the untrims are properly intersected to trim and offset the surfaces to 2.5 mm to create the thickness.
• Fill the patches which are not offested by the using the commands like extract,boundary and multi-section surface.
• Then join the patches to the offseted surface using the command.So will get the complete class B.

CREATING CLASS C SURFACE:-

For creating the class C surface once the B-class surface is created then form the A – Class surface the with the help of sweep command and with the tooling direction another surface is created intersecting the B Class surface created and then the surfaces are trimmed to get a single desired surface.

CLOSED SURFACE :

Draft analysis for Close Surface

Next, the profile is extruded, to find the height,h=Wall thickness * 5

=2.5*5

= 12.5 mm

Therefore, the height is 12.5 mm

The extruded surface is thickened,

Thickness,w=0.4*t

=0.4 2.5

=1mm

Therefore, the thickness of the rib is 1 mm

SCREW BOSS

The boss is created but needs some support. So, we created ribs for support.

First, draw a sketch and Iso-constraint it.

Trim the screw boss with the ribs.

Similarly, to create another one copy the screw boss and past it in main part body then translate it.

Conclusion

• TOOLING AXIS for the CLASS A SURFACE and MODEL is created
• CLASS B AND CLASS C surface is created from CLASS A surface
• SURFACE MODEL is created using CLASS A, B & C surface
• SOLID BODY is created from SURFACE MODEL using close surface
• RIBS AND SCREW BOSS are created considering the design rules
• DRAFT ANALYSIS is done on CLASS A SURFACE and SOLID BODY
• Publications: Use the publication option to publish the following
  • Tooling Axis
  • Class A, B, and C surface
  • SURFACE MODEL
  • SOLID-BODY