Week 9 - Attachment Feature Creation - Challenge 2

AIM

Create the dog house for the door trim considering the design rules

INTRODUCTION

DOG HOUSE

Dog house is an engoneering feature used in plastic design dog house are used as support feature. Some time other engineering feature like snaps,locators,screw bosses are mounted on them to increase their strength.

Dog hose are subjected to draft analysis to prevent breakage of the component during ejection from the mould cavity.Dog house and other engineering components are built on the B- surface.

OBJECTIVE

Create tooling axis for the given class-A surface

Create the class BandC surface of door trim using the given class-A surface.

Create final surface model and convert it into solid body using close surface command in the part design work bench.

Creat side core axis for dog hose.

Creat dog hose on the B surface by considering the design rules.

DESIGN METHODOLOGY

Class-A surface means vilsible surface.It given the assthetic of the component which is creat by the styling team and givens to part design engineer to creat the part with all engineering aspects.

PROCEDURE FOR TOOLING AXIS CREATION

• Check the best possible tooling direction by manvally adjusting the compass.
• By analysising it is found that y axis as tooling direction would clear most of the faces without any diffclties.
• Now extract and surface and create a mid point on it.
• then create a doummy axis creating a line on the point and direction along the Y axis.
• Perform draft analysis to find whether the given axis clearing the draft analysis.If not create a new tooling axis.

DOG HOUSE CREATION

• Dog house are designed to avoid SINK MARK created on the CLASS-A surface by screw basses and to solve the length issues when giving screw which need to be assembled to other components.
• It is also useful when perpendicular screw basses are required on the part to the tooling direction.
• C thickness should be 40% of the main wall thickness T.
• Minimum width of the dog house is 12mm.
• Hight of B should be 3-6mm.
• Minimum draft for the do house is 1.5 degree to die draft.

PROCEDURE FOR CREATING THE DOG HOUSE

• First step is to creat a side core axis.
• I have chosen normal to the point method for creating the side core tooling axis.
• create the dog house by creating positionedsketch on the Z-X plane.Using extrude or sweep method create dog house outer walls.
• Now clase the top wall using the multi section surface command.
• Using thicken command in the part workbench create a solid part of the dog house.
• Give proper draft angles and fillets by considering the design rules.

DRAFT ANALYSIS OF CLASS-A SURFACE

CLASS-B SURFACE CREATION

• Class-B surface mean thickness of a part it is not visible and is inside part.In other words.
• Class-B surface is a surface.below a cretain thickness from the class-A surface. this is the surface that cantains engineering aspects of a model.
• Create offset surface of class_a about 2.5mm in ward direction.
• Check for the discontinuity and rework on the offset surface using extact multi-extract multi section surface.
• Join the surface and ensure the final class-B surface created has on gaps.