Challenge

To Create the screw boss and Dog House for the Centre console coin holder considering the design rules

YYashwanth P M7 May 2021

AIM: To Create the screw boss and Dog House for the Centre console coin holder considering the design rules.

Procedure:

Create tooling axis:

Tooling direction is the direction in which mold opens or Core and Cavity opens.

To create the tooling axis, we need proper orientation or view thatgives the correct featues and draft available in the component.
So here the component view from the Y direction gives the proper view for the tool to see the features present in the geometry.

Tooling axis is created by using Bisecting method.

Procedure

The base surface is extracted.
Then the center point is created using the point>on the surface at 0.
Axis system is created at that point.
Then the lines are created using 'lines'>'Point to point' along the slant surfaces.
Bisecting line is created from these lines by using 'lines'>'Bisecting line'. This is the tooling axis for the part.

Creation of Screw Boss:

Design rules for the screw boss and rib.

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.

Create a sketch of the screw boss on the surface using positioned sketch.
Pad them and union trim to form the screw boss.
Give fillets of radius 0.25mm wherever required.

Fig: Screw boss

Creation of dog house:

Design rules for the Doghouse.

"C" is where the doghouse contacts the backside of the surface
Doghouse wall thickness at the intersection of the part wall ( C ) should be 40% or less than the main wall stock ( T ).
Height of ( B ) should be between 3.0 – 6.0 mm

Procedure

Extract the base and create a point and axis system. draw a sketch.
Extract the surface out of the sketch using extrude option.
Create a closed surface with undercut by creating and trimming of surfaces.
Convert Closed surface into solid part using 'Closed' option in part workbench.
Give draft angle of 0.5 deg and fillet of 0.25mm for all the faces.

To move the Screw bosses and dog houses use 'translate' option.

Fig:Dog House

Draft analysis:

For the draft analysis of dog house, Outer surface can be cleared using main tooling axis but for the inner part we have create separate tooling axis.