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DESIGN AND DEVELOPMENT OF B-PILLAR THROUGH MASTER SECTION OBJECTIVE Create the door applique Plastic component through the given Class-A surface, and create tooling axis, perform draft analysis and also create Class-B surface& Class-C surface. Create engineering features like locators and heat stakes. INTRODUCTION…
Sathyasaran J.M
updated on 29 Nov 2021
DESIGN AND DEVELOPMENT OF B-PILLAR THROUGH MASTER SECTION
OBJECTIVE
INTRODUCTION
The Draft allows the part to easily eject from the mold. The draft angle is to reduce friction between the core, cavity and part and it also avoid the damages. The minimum draft angle is 0.5 degree and the most common draft angle used in the plastic design is 3 degrees.
In CATIA the draft 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.
Tooling direction is the main element that to be consider while designing a plastic component. In moulding machine the arrangement is given to open the mould along the direction. It is the direction in which the core and cavity opens.
CLASS A SURFACE
1.Visible surface and aesthetic look
2.Surface with textures
3.Surfaces provided by customer(OEM)
4.Don't have any features like(rib ,snap ,bosses etc.) on class A surface.
5.Class A surface is made from scanned data with different software like alias etc..
6.Surfaces which is having CURVATURE CONTINUITY IS CALLED class-A.
CLASS B SURFACE
1.Invisible Surfaces.
2.Surface mostly don't have textures
3.Surface need to be create according to class-A surface.
4.Having all features(Rib, boss, snap etc.) in B-side surface only.
5.Surfaces which is having TANGENT CONTINUITY IS CALLED class-B
CLASS C SURFACE
Which join both Class-A and Class-B Surface
B PILLAR
B Pillar is the most complex component/structure of the vehicle body. This is because the front door closes on the B pillar while the rear door hinges onto it. The B pillar or the center pillar in vehicles is made of steel. It is welded to roof panel on top and the vehicle’s floor pan at the bottom. This pillar provides structural support to the vehicle’s roof.
Manufacturers skip the B pillar while naming other pillars. Hence, some vehicles do not have a B Pillar. The carmakers term those cars as 'Hardtops.' Instead, the vehicle specification shows the rearmost pillar as the C pillar. The manufacturers offer the Hardtops in nearly all four-door body styles. They include sedans, coupes, and wagons/MPVs. The cars without B pillars increase passenger’s visibility. However, they have limited structural support and strength. General Motors later started providing B pillars in Hardtops. Thus, it created a new vehicle body type and thereby broadened the definition of Hardtops.
DOG HOUSE
Dog house is an engineering feature used in plastic design. Dog houses are used as support feature. Dog houses are subjected to draft analysis to prevent breakage of the component during ejection from mould.
RIBS
When the normal wall thickness is not stiff enough or strong enough to stand up to service conditions the part should be strengthened by adding ribs rather than making the whole wall thicker. The principle is the familiar one used in steel girders where 'I' and 'T' sections are almost as rigid as solid beams but are only a fraction of the weight and cost. Ribs are used to improve the rigidity of a plastics part without increasing the wall thickness so much that it becomes unsuitable for injection moulding. Ribs are important in the design of plastics parts because they allow us to make a component rigid without making it too thick.
Points to be considered while designing ribs
LOCATING PINS
METHODOLOGY
GIVEN CLASS – A SURFACE (DOOR APPLIQUE)
PROCEDURE
Continuity check:
TOOLING AXIS
DRAFT ANALYSIS
FLANGE CREATION
B SURFACE CREATION
C SURFACE CREATION
DOG HOUSE
4 WAY LOCATOR
RIB CREATION
PUBLICATIONS
DRAFT ANALYSIS
FEATURE TREE
CONCLUSION
Thus the B pillar is created using given Class A and master section with engineering features
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