Challenge

Week 11 - Final project

FINAL PROJECT

AIM:

To create a door interior part from the inputs of class A surface along with master section by following the design rules followed in tier 1 and OEM industries in catia v5.

GIVEN DATA

Creating a tooling axis in class A surface:

The direction in which the mould open and closes is the tooling axis.
Check the connectivity of the surface and ensure there will be no gap between the surfaces and then define the tooling axis.
While creating a tooling axis give the tooling axis on a flat length surface or the surface which have a hole on it.
Create a point on the surface where we are going to create the dummy tooling axis and using line command crate an axis. If there is a circle or flat length surface which is recommended.

Draft Analysis:

The draft analysis technique is used to analyze whether our part model created in CAD is manufacturable based on the draft condition applied.
Minimum draft angle is considered as 3 degree.
step 1= enter part in Catia.
step 2= Go to Material Mode.
step 3= go for draft analysis.
step 4= drag axis bar to the tooling direction of part.
step 5= check for draft and make parting line as per analysis.

Create a class B surface:

Class B surfaces are the secondary surfaces in plastic component design.
In this model Class B-Surface is extracted from the A-surface and it is offseted at 2.5mm in downward direction.

create a class C surface.

Class C is often specified for interior surfaces not readily visible, surfaces that will be covered by another part when assembled, or surfaces which the Customer feels do not need to meet a high cosmetic finish.
C-Surface connects the class A-Surface and B-Surface. It is created using Sweep command.
Boundry of the class A-Surface is swept along the tooling direction.

DOG HOUSE

Dog house is an engineering feature used in plastic trim design. Dog houses are used as supporting feature. Sometimes other engineering features like snaps; locators etc. are mounded on them to increase their strength.
Dog houses are subjected to draft analysis to prevent breakage of the component during ejection from mould cavity. Dog house and other engineering components are built on B-surface.
Thick sections waste material and are simply uneconomic. So solid shapes that would do the job well in wood or metal must be transformed to a 'shell' form in plastics.
Tooling must be cleared for easy ejection of the component, from the core cavity. In order to clear tooling certain value of draft is given to the component. Minimum of 2-3deg is provides on all plastic components.