Door Trim panel-Project
AIM:To create a CAD model taking into consideration of ClassA,ClassB,ClassC surface of door arm rest,lower substrate,map pocket and bottle holder and to draft analysis and tooling analysis of the respective model.
PROCEDURE:(i)Lower Substrate of classA surface is shown below:
And the draft analysis at 3deg. along the tooling axis of the model given above shown below:
So from the given tooling axis we can create the classB of offset of 2mm and ClassC surface by swept and the model we will get from this given below:
(ii)Map Pocket of ClassA surface is shown below:
And the draft analysis at 3deg. along the tooling axis of the model given above shown below:
Now the solid model which we can get by offseting classA and swepting the classC surface :
(iii)Bottle Holder of ClassA surface is shown below:
And the draft analysis at 3deg. along the tooling axis of the model given above shown below:
Here we have got to include 2 tooling axis for the axial core and for the side core because all the surface wouldn't be clear it out for the with single tooling axis.
Now the solid model which we can get by offseting classA and swepting the classC surface :
(iv)Now the last part which we have the door arm rest which we have to split into 2 halves in order to clear it for the tooling axis,for that we have the 2 parts for it 2 different tooling axis.The 2 parts which is being seggregated are shown below:
And the draft analysis at 3deg. along the tooling axis of the model given above shown below:
Now the solid model which we can get by offseting classA and swepting the classC surface :
(v)The swap tool is provided to create surfaces by sweeping profile along the guide curve in the wireframe and the surfaces.
Similar to the creating swept surfaces but we have to select the direction of draft analysis.
This tools allows the multi section surface.To create the multi section surface,you first need to create sections and the guide curve then choose the multi section to create the surface.In the some surface we have to create the blend and then trimming it out the surfaces to get the closed closure and the surface.
(vi)Now moving onto the attachments feature like Heat stakes,2&4 way locators,Ribs and Flanges .These are all situated at the connecting boundaries of the door arm & lower substrate,map-pocket & lower-substrate,bottle-holder &lower substrate along with some additional positions and these additional features should be having a draft of 0.5mm and edge-fillets of 0.5mm.
Now we have to create the dog house in such way that it can clear the draft analysis along with every additional feature should clear the draft analysis criterion shown below:
Now at last the tree structure which has become:
Plastic model difficult to demold due to friction between the cavity and the mold hence finished mold cna be deformed or damaged therefore designer should add the draft angle to the geometric surface of the product.