Week 10 - Challenge 2- Attachment Feature Creation (Dog House)

DOOR TRIM FOR DOG HOUSE :

Aim: Create the Dog House for the Door Trim considering the design rules as given.

Introduction to Dog House:

In plastic design, a dog house is an engineering element. As a support feature, dog homes are employed. Other technical features like snaps, locators, and screw bosses are sometimes put on them to boost their robustness.Draft analysis is performed on dog house to prevent component breakage during ejection from the mould cavity. The B-surface is used to construct the dog house and other technical components.

Objective:

For the supplied Class-A surface, create a Tooling axis.Using the specified CLASS-A surface, create the class-B and class-C surfaces of the door trim.Create a final surface model and convert it to a solid body on the part design workbench by using the close surface command.Create the dog house's side core axis.Consider the design criteria while creating a dog home on the B surface. Draft both the Class-A surface and the Final component body.

Design Methodology:

Class-A surface refers to a visible surface. It provides the look of the component generated by the style team and provides the part design engineer with all engineering aspects to construct the part.

• Given The surface is Class A.

Using the Join or Boundary commands, check the surface for continuity.Create a tooling axis if there are no gaps on the A surface.

• Tooling axis construction procedure:

• Manually adjust the compass to get the optimum possible tooling direction.
• After careful consideration, it was decided that using the y axis as the tooling direction would easily clean the majority of the faces. Now, select any surface and draw a midpoint on it.
• Then, on the location and direction along the y-axis, draw a dummy axis.
• Perform a Draft analysis to determine whether the provided axis passes the Draft analysis. Create a new tooling axis if necessary.

Draft analysis of Class-A surface :

Creating a Class-B surface :

Class-B surface refers to the thickness of a part that is not visible and is located inside the part. In other words, the Class-B surface is one that is thinner than the Class-A surface. This is the surface of a model that comprises engineering characteristics.Create an offset surface of Class-A approximately 2.5mm inward.Examine the offset surface for discontinuity and rework it using extract, multi-extract, and multi-section surfaces.Join the surfaces to guarantee that the final Class-B surface has no gaps.

Creating a Class-C surface:

Class-C surfaces are those that connect class-A and class-B surfaces. Class C is frequently specified for interior surfaces that are not easily visible and will be covered by another item when completed.Create the sweep with regard to the surface and tooling axis, multiple-extracting the Class-A boundary.Extrapolate and multi-section surface commands can be used to join the sweep surfaces.Finally, join all of the sweep surfaces to assure the Class-C surface's continuity.

Creating the final surface:

Join the CLASS-A and CLASS-C surfaces to make the Finals door trim surface.
Then, extrapolate the B surface slightly outward to ensure that there is no gap when trimming with the linked surface.
The extrapolated CLASS-B surface is then trimmed with the Join surface (CLASS-A and CLASS-C).


In the part design workbench, use the close surface command to create a solid part body:

DOG HOUSE DESIGN:

Dog houses are meant to eliminate SINK marks on the Class-A surface caused by screw bosses, as well as to decrese length difficulties when providing screw bosses that must be attached to other components.
It is also beneficial when perpendicular screw bosses on the component to the tooling direction are required.

• C thickness should be 40% of the main wall thickness (T)
• Minimum width of the dog house is 12 mm.
• Height of B should be 3-6 mm.
• Minimum draft for the do house degrees 5 degrees to die draw.

Creating the Dog House :

• The initial step is to draw a side core axis.
• For the side core tooling axis, I used the standard to-the-point approach.Create the dog house by sketching it out on the z-x plane.
• Create the exterior walls of the dog hose using the extrude or sweep method.Now use the multi-section surface command to seal the top wall.
• Create a solid component of the dog home in the part workbench by using the thicken command.
• Consider the design guidelines for providing suitable Draft angles and fillets.
• Union trim the dog house body portion with the door trim component using the Boolean operator.

3D model of a part in multiple orientations (Isometric, Front, Side, and Top View):

Draft Analysis :

The Draft Analysis command determines if the portion you sketched can be easily removed. This method of analysis is based on colour ranges that define zones on the investigated element where the deviation from the Draft direction corresponds to prescribed values at each location. After finding the tooling axis, Draft analysis is utilised to determine whether or not the minimal Draft (3 degrees) is maintained.

The following is the procedure for doing the Draft analysis:

• Change the component's view mode to customised parameter mode, and then choose the shading mode as materials.
• Then, from the insert menu, select the featured Draft analysis instrument.
• Then, click Use the compass to determine the current drafting direction, and then drag and align the compass on the Tooling axis.Then, by clicking on the component, lock the Draft direction and execute the Draft analysis.

Draft analysis of Dog House using the Side Core Axis :

Draft analysis of final Door trim component:

The Part Body's Part and the Geometric Set's Expanded Tree Structure:

Conclusion:

Using the given Class A surface of the door trim, the generated main and side core tooling axes effectively created Class B and C surfaces as per the requirement. Draft analysis was performed on the finished component and the dog house.