Week 10 - Challenge 2- Attachment Feature Creation (Dog House)
DOOR TRIM DOG HOUSE WORKBENCH
Objectives: To create DOOR TRIM DOG HOUSE COMPONENT model using the Class-A Surface. It’s a plastic component so by keeping in mind all engineering constraints the model will be designed. This starts with the TOOLING AXIS for the Class-A surface should be created.
Introduction:
Class-A Surface: It is an outermost surface which is developed by the designers and it is provided as an input to the modeller to work on it.
Class-B Surface: It is a surface at a certain thickness from the Class-A Surface.
Class-C Surface: It is a surface that joins the Class-A and Class-B Surfaces.
Commands or tools were used to create a closed surface/solid model, performing on the Class-A surface:
OFFSET >> EXTRACT >> BOUNDARY >> EXTRAPOLATE >> FILL >> SPLIT >> TRIM >> EDGE FILLET >> SWEEP >> JOIN >> CLOSED SURFACE (Part Design)>> THICK SURFACE (Part Design) >> DRAFT (Part Design) >> TRANSLATE (Part Design) >> DRAFT ANALYSIS.
FOR TOOLING AXIS CREATION:
• First with the extract command one surface is extracted from Class-A surface.
• Now with the point command center is created on the extracted surface for creating a dummy tooling axis.
• Now creating a dummy tooling line along Y-axis direction with the line command.
• Finally TOOLING AXIS line with the line command is created.
FOR SIDE CORE TOOLING AXIS CREATION:
• Using the same point as a center for creating a side core tooling axis.
• Now creating a tooling line along X-axis direction with the line command.
• Finally SIDE CORE TOOLING AXIS line is created.
FOR CLASS-B SURFACE CREATION:
First we directly offset the Class-A surface for creating Class-B surface which is of 2.5mm in distance. The previous methods can’t use cause for simple components the methods are easy to create any component but complex component like bumper, door trims, etc., which is not easy to create those methods are not applicable. After the offset of Class-A surface, it can be seen that on Class-B surface some of the patches are missing. So for that all the missing patches should be filled below are the processes for filling the patches.
• First with the join command we remove some more patches to get a clear path for gap filling by “sub-elements remove”.
• Now with the boundary command created the boundary lines around the gaps, after that by fill command gaps are filled.
• Again with join command all the filled patches are joined with the offset surface.
• Finally the Class-B Surface is created.
FOR CLASS-C SURFACE CREATION:
• It is seen that door trim surface is perpendicular to the tooling axis, so with the sweep command the extended surface is going to create.
• First by using boundary command creating a path for sweep.
• Now creating an extended surface with the sweep command by using ‘with draft direction’.
• If it is not created in a single loop then use separated loops.
• Finally by using join or trim command create the Class-C Surface.
FINAL DOOR TRIM SURFACE CREATION:
• Now with join command, join the Class-A and Class-C surfaces.
• After joining of Class-A & Class-C surfaces trim the achieved surface with the Class-B surface.
• Finally the closed surface body of the component is achieved in the surface design.
• Now move to part design with the close surface command, solidifying the component.
DOG HOUSE CREATION:
• First side core tooling axis is created for dog house creation.
• Now extracted the surface and creating a point on it.
• Created a plane by referring the point.
• By using positioned sketch created the boundary line of dog house.
• Now by using sweep command created the outer wall of dog house and then covered the top.
• Now thickened the achieved surface with the thick-surface command.
• Now to achieve C thickness, we extract the surface and the offset it up to 4mm distance. Extracted the dog house inner surface and offset it to half of the thickness, trim both the achieve surfaces and finally achieved a required surface.
• Now in part design by using the split command we cut off the unwanted surface and provide draft in the inner surface.
• Now providing fillets on the edges as required.
• Finally the dog house is created.
FOR DRAFT ANALYSIS CREATION:
• First set material mode, now click on the draft analysis.
• After opening an interface of draft analysis, click on the symbol of datum/compass align it with the tooling axis.
• Click on the surface and see that the surface is within the permissible limit of the draft values.
• Be ensuring that the surface should be green and if not flip the direction of the datum/compass it will turn into green.
• And after flipping the direction still not the draft analysis is not working, close the command and delete the 'Free From Analysis' and perform the process, it will start working.
• And if found that some area is still not turning into green, check the geometrical set or set the tooling axis with different values.
