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

                                 Attachment Feature Creation (DOG HOUSE)

  EXPLAINATION

  DOG HOUSE

In plastic design, a dog house is an engineering element. As a support feature, dog houses are used. Other engineering features like as snaps, locators, and screw bosses are sometimes put on them to boost their robustness.

Draught analysis is performed on dog houses to prevent component breakage during ejection from the mould cavity. The B-surface is used to construct the dog home and other engineering components.

 OBJECTIVE

 For the supplied CLASS -A surface, create a Tooling axis.
Using the specified CLASS-A surface, create the CLASS B and C surfaces of 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 when creating a dog house on the B surface.
Draught both the Class-A surface and the Final component body.

Design Methodology

Visible surface is a Class-A surface. It provides the style team's look for the component, which the part design engineer uses to develop the component with all of the engineering requirements.

CLASS-A surface given

   

Check for continuity of the given surface using Join or Boundary commands.

If there are no gaps on the A surface, create tooling axis.

Procedure for Tooling axis creation

Manually adjust the compass to find the optimum possible tooling direction.
After careful consideration, it was discovered that using the t y axis as the tooling direction will 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.
Conduct a draught analysis to determine whether the provided axis passes the draught analysis. Create a new tooling axis if necessary.

     

Draft analysis of CLASS-A surface

     

CLASS-B surface creation

Class-B surface refers to a part's thickness that is both inside the part and not visible. In other words, a surface that is classified as Class-B is one that is thinner than Class-A. This is the area of a model where the engineering components are located.

Cin LASS-A's creanate offset surface faces approximately 2.5mm inward.
Using extract, multi-extract, and multi sections surfaces, check for discontinuity and revise the offset surface.
Join the surfaces together, making sure there are no gaps in the final CLASS-B surface.

     

CLASS-C surface creation

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 part when assembled.

Create the sweep with regard to the surface and tooling axis multiple-extracting the CLASS-A boundary.
Extrapolate and trmulti-sectiontion surface commands can be used to join the sweep surfaces.
Finally, connect all of the sweep surfaces to assure the CLASS-C surface's continuity.

     

Creating the Final surface

• For creating the Finals door trim surface, join the CLASS-A and CLASS-C surfaces together.
• Then Extrapolate the B surfacea  little bit outward direction to make sure that there would not be any gap when trimming with the joined surface.
• Then trim the extrapolated CLASS-B surface wthe ith Join surface (CLASS-A and CLASS-C)

     

Make a solid part body using the close surface command in the part design workbench

     

DOG HOUSE Creation

Dog houses are meant to avoid SINK MARK on the CLASS-A surface caused by screw bosses, as well as to solve length difficulties when providing screw bosses that must be attached to other components.
It is also beneficial when perpendicular screw bosses on the part 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 to draw

• Procedure for creating the DOG HOUSE
• Creating a side core axis is the first stage.
  For making the side core tooling axis, I've gone with the straightforward, conventional approach.

•  

  • Create the dog house by creating a positioned sketch on the z-x plane. Using extrude or sweep method create dog hose outer walls.
  • Now close the top wall using the multi-section surface command.
  • Using thicken command in the part workbench, create a solid part of the dog house.
  • Give proper draft angles and fillets by considering the design rules.

       

  Using Boolean operation, union trim the dog house body part with the door trim component.

       

  3D Part model in various orientations (Isometric, Front, Side, and Top View)

  

• DRAFT ANALYSIS

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

  Draft analysis is done after determining the tooling axis, draft analysis is used to check whether the minimum draft (3 degrees) is maintained or not.

  • Procedure for performing the draft analysis are as follows
  • Change the view mode of the component to be in customized parameter mode and then select the shading mode as materials.
  • Then open the featured draft analysis tool from the insert menu.
  • Then click on the use the compass to define the current drafting direction and then drag and align the compass on the Tooling axis.
  • Then lock the draft direction and perform draft analysis by clicking on the component.

  Colour Range representation

  GREEN colour - Positive Draft

  RED colour – Zero draft

  BLUE colour – Negative Draft

• Draft analysis of DOG HOUSE using the Side Core Axis

  

  Draft analysis of final Door trim component

       

• Conclusion
• Using the specified CLASS A surface of the door trim produced main and side core tooling axes, I successfully created CLASS B and C surfaces. Draught analysis was performed on the finished component and the dog home.