Week 10 - Challenge 2- Attachment Feature Creation (Dog House)
Attachment Feature Creation (Dog House)
Aim:
To Create the Dog House for the Door Trim considering the design rules and perform the draft analysis for class A and create the class B & C surface, final close body component and perform the draft analysis.
Objective:
- To Design the door trim following the design rules
- Use the Close Surface feature to make a solid body from the surface.
- To create the tooling Axis and Performing draft analysis on the final component.
- To Design the required dog house and analysis them.
- Perform the Draft analysis for the final component.
Door Trim:
Tooling Axis:
In plastic design injection molding the Tooling Axis is the most important criteria. The tooling axis along to the core and cavity area, also the component ejecting ways of the core and cavity is most common in tooling direction only. For creating the tooling axis in this drill handle is differnt and very ease with comparing to the previous plastic component design.
First creating the dummy tooling axis on point to direction method and check the possiblity for draft analysis, its not perform full core and cavity side.
Bisecting tooling axis also not perform the correct tooling direction.
so here extract the flat surface and created the point the option of point on surface to the extracted surface and select the zero point create the tooling axis as Main Tooling axis
Class A:
Class A surface is the aesthetic skin data for the automotive part designing and curvature surface to represent the main component.Befor proceed with A surface to analys the Draft angle, if get any mis-match surface reconstruct the A surface.
Draft Analysis Class A
Draft analysis is the main requirments in plastics Design. If the draft angle is less than 0 degree, the part or component and tool is to be damaged in mass production. Also the molding part would not eject from the core and cavity. So the drafting analysis to find out the lesser angle are by the colour variation.
Above 3 - Green
0 to 3 - Blue
< 0 - RED
2.9° is accepted in engineering features creation.
Class B surface:
For create the class B surface here we directly offset the class A surface to the total thickness of close body to inward direction some of the surfaces give offset error and ask for offset without these subelements click okay and work on the incomplete surfaces by using the multi-section surface command or extrapolate, fillet and different commands used to complete the class B surface.
Thickness of the component to be 2.5 mm
So offset the class A to 3 mm inward, inthis case fillets are showing some error. Because of the inward offset the fillet will be reduce.At this moment we reconstruct the B surface with respect to the A surface.So using multi section surface command and create the surface which is in the missing fillet area. Then spilt from the offset.1 and using join with the option of sub element to remove to the remove fillets and extracted surface from the offset1.
Then trim with the extracted surface to the all flat extrapolated got the B surface and give the all fillets with respect to class A.(Here consider the offset is inward direction so the fillet radius will change with respect to the thickness of close surface.)Otherwise you can directly measure the offset surfacefillet radious.
Class C surface:
We first extract the edges from the Class A surface with the help of the multi extract or boundary command which we create the curve for sweep command. For creating the C surface draw a boundary to the class surface edges and sweep the edges with draft direction and with reference surface. The surface which is paralel to the tooling axis to use the sweep at the draft direction and the surface which is perpendicular to the tooling axis is swept with the reference surface.
Then extrapolate the missing edges and trim together wil get the class C surface.
Class A and Class C:
To join the class A and Class C surface by using join command.
Final Trim:
To trim the Surface (A+C ) with the B surface.
Close Solid Surface:
START -> MECHANICAL DESIGN -> PART DESIGN -> SURFACE FEATURE -> CLOSE SURFACE
DOG HOUSE DESIGN:
Dog house is an engineering feature used in the plastic trim design. Dog houses are used as supporting features. Sometimes other engineering features like boss; locators, etc. are mounded on them to increase their dimension and strength. Dog house and other engineering Features are built on final close solid body.
Design rules for Dog house creation
Create the sketch and draw the required shape of dog house and constrain all the dimensions.Then create the body and pad it.
Draft the dog house body at the angle of 1.5° and the neutral element is plane, tooling axis is main tooling axis.
Draft Analysis
Side Core draft analysis create the new side core tooling axis and perform the draft analysis as side core axis.
Final Close Body Draft Analysis:
Procedure for performing the draft analysis are as follows
- Change the view mode of the component into customized parameter mode and then select the shading option as material mode.
- Then open the featured draft analysis tool from the insert menu -> Analysis.
- Then click the compass and drag the axis to define the current drafting direction to tooling axis.
- Then lock the draft direction and perform draft analysis by pick the component.
- The green colour shows the positive daft tooling direction and the given surface passes the draft analysis.
Above 3 - Green
0 to 3 - Blue
< 0 - RED
The final draft analysis the close surface clear by the draft angle.In Plastics design 3 degree is the minimum draft angle to drafted over the area which is permissible at the injection molding manufacturing area.Here the class A surface not clear 3 degree draft, so the final close body also not clear in 3 degree draft.
Different Views
FRONT VIEW
SIDE VIEW
TOP VIEW
ISO VIEW
TREE STRUCTURES
CONCLUSION:
Hence the tooling axis and Draft Analysis is done for a class-A surface of door trim and adding the engineering features dog house was done successfuly.