Challenge

Week 9 - Attachment Feature Creation - Challenge 2

RRushikesh Patil18 Feb 2022

CREATION OF BOSS AND DOGHOUSE FOR THE CNETER CONSOLE COIN HOLDER CONSIDERING THE DESIGN RULES IN CATIA

CREATION OF TOOLING AXIS:

From visual inspection we can see that the tooling axis will be along the plane normal to the base of coin holder as we can see visually that hollow part of coin holder should fit either in the core or cavity.

Though we have to use a side core for the hole it is recommended to use the axis normal to base surface.

Create a center point on the base as shown below.

Create an axis system at the point imaging to the original axis.

Create an Intersection line of Class A surface and ZY plane of created axis system.

We can observe that the intersection wall lines are perpendicular to the base surface.

We can observe the same problem along the intersection along XZ plane as the walls are exactly perpendicular to the base surface.

Since the class A surface should be created with a minimum draft along all ghe surfaces because the plastic body created from class A should be ejected easily from core and cavity and surfaces with draft are easy for ejection after cooling the part.

Since the class A surface is not provided with sufficient drafts and modifications to the class A surface are prohibited for us so we proceed further taking the axis normal to the base surface as tooling axis and create a plastic component of thickness2.5mm.

Creation of Side core tooling axis:

Create a line through the point in the Z direction as shown below.

Draft Analysis of Class A Surface:

Click on the feature draft analysis in Analysis tab

Or Go to insert >Analysis > Feature Draft Analysis

Click on the compass in direction row and align the compass along the tooling axis as shown below. Also disable the analysis under running point option in display row in draft analysis tab.

Some times the compass disappears or will be placed far fron the surface, zoom out from the surface and disable and enable the compass to see the compass and drag it to the tooling axis.

Once the compass is aligned lock the compass.

After locking left click anywhere on the surface. It will look as shown below.

The green colour on the surface shows that the entire surface is provided with a minimum draft of 3 degrees.

The red coloured surfaces have a negative draft angle but we proceed further for plastic part creation.

Creation of screw boss:

Create sketches as shown above. Pad the screw boss to a height of 12mm and pad the ribs to a thickness of 1mm. Union trim the ribs boss and assemble the screw boss to the coin holder and add required fillets following the design rules.

Creation of doghouse:

Create the sketch as shown above and sweep the surface along the tooling axis with a draft angle of 1.5 degrees.close the top surface and thicken the surface to a thickness of 2mm.