Week 10 - Challenge 1- Attachment Feature Creation (Ribs & Screw Boss)

ATTACHMENT FEATURE CREATION (RIBS & SCREW BOSS)

Aim:

• To create the door handle component from the given class-A surface.
• To create the tooling axis for the given class-A surface meeting the requirements of the draft angle.
• To attach B side features (Ribs & Screw boss) in the component.
• To perform the draft analysis on the model.

TOOLS USED:

• Boundary
• Join
• Multiple extract
• Bisecting line
• Trim
• Offset
• Draft analysis
• Sweep
• Close body surface.

DESCRIPTION:

CREATING TOOLING AXIS:

• Open the given CAT Part file.
• Check for gap between the surfaces for that click on join and them preview.
• If there is any gap between the surfaces join them with a maximum tolerance of 0.003mm.
• Extract the boundary and disassemble the boundary.
• Find the correct tooling axis where the material don't interfere with the tooling axis and all the elements can be created.
• Create an axis system using at the center of the door handle.
• Intersect the YZ plane with respect to the class-A surface.
• Hide the class-A surface and create the point to point lines on the suspected draft.
• Create bisecting line to the two lines and point to create the tooling axis.
• The tooling axis is created for the component by using bisecting line.

CLASS-A DRAFT ANALYSIS:

• Before going to draft analysis go to customized view parameter~under mesh~check material and then click ok.
• Now for draft analysis go to insert~analysis~feature draft analysis.
• Use the compose to define the draft direction.
• In the colour scale change to the draft angle 3 degree.
• The component changes into green color indication of passing the draft angle.
• Use running point to check the angle of the component.
• The draft analysis is complete.

CREATING ClASS-B SURFACE:

• Extract the surface from the class-A using multiple extract and untrim them.
• Use extrapolate to make sure that all the untrim are properly intersected to the trim.
• Offset the surface to 2.5mm to create the thickness.
• Trim the extract surfaces using trim command.
• Apply fillets to the model after creating the entire surfaces.
• Extrapolate all edge to the surface 5mm so can avoid the gap.
• Verify the B surface no gap marks in the surface.

CREATING CLASS-C SURFACE:

• Extract the boundary from the class-A surface using boundary command.
• Use disassemble tool to devide the boundary as the boundary contains domain.
• Use sweep command~surface with draft direction~choose guide curve and draft direction~give draft angle~preview.
• After getting sweep and then trim the output with class-B surface to get final output.

FINAL COMPONENT:

RIB CREATION:

To create rib feature in model select the line and draw where you want it. Extrude the line surface height 3 times to the thickness.

Thick the surface and later draft 0.5° all sides. Finally give edge fillet 0.25mm.

• DESIGN PRINCIPLE FOR RIB CREATION:

SKETCH USED FOR RIB CREATION:

SCREW BOSS CREATION:

To create a screw boss wall thickness must be 1.5mm Of screw hole diameter. Height 5 times of wall thickness and draft angle 0.5° at outer edge fillet 0.25mm add the body to the main body.

• DESIGN PRINCIPLE FOR SCREW BOSS CREATION:

SKETCH USED FOR SCREW BOSS CREATION:

FINAL COMPONENT:

FINAL COMPONENT DRAFT ANALYSIS: