Week 8 - Challenge 1 - Base Bracket Design

AIM

Create the Base Bracket Plastic component through the given Class-A surface. To begin with, the tooling axis for the given Class-A Surface should be created meeting the requirements of the draft angle and at the end perform the Draft analysis on the model.

GIVEN CLASS A SURFACE

fig 1 class A surface

TOOLING AXIS CREATED IN CLASS A SURFACE

Tooling axis

In this direction in which the mold opens and closes .

selected the appropriate tooling direction and created a dummy tooling axis

fig 2 tooling axis

then created main tooling axis by using the bisecting method.

BISECTING METHOD

This method is used for creating the main tooling axis .creating the intersection of the given class A surface along y plane.Select the surfaces in the tooling direction and drawn the lines along this surfaces .If this lines are parallel bisecting line shows the error in order to know given surface is toolable or not. Then create a bisecting line using this two inclined line ,this bisecting line is the main tooling axis.shown in fig 3.

fig 3 bisecting method

DRAFT ANALYSIS ON CLASS A SURFACE

Draft is a taper applied to the faces of the part that prevent them from being parallel to the motion of the mold opening. This keeps the part from being damaged due to the scraping as the part is ejected out of the mold

draft analysis is performed on the given class A surface using the main tooling axis to check the surface has minimum draft (3 degree). draft analysis shown in fig 4 .The given surface has minimum draft angle .

fig 4 Draft analysis and color varient

CLASS B SURFACE

Class B is an engineering surface it created from the input class A surface . Extracting the required surface then untrim,extrapolate and offset the surface in the required thickness .finally trim the surfaces and create the class B surface shown in fig 5

fig 5 class B surface

CLASS C SURFACE

The class C surface created by using boundary lines of class A surface and sweep it with reference to the main tooling axis.Use sweep with draft direction then provide accurate draft angle and length .draft direction should be main tooing axis.class C surface shown in fig 6 .

fig 6 Class C surface

• Then join class A surface with class C surface
• Finally trim the joined surface with B surface to get the final closed surface body shown in fig 7 .

fig 7 closed surface

• The solid body created by using close surface on part workbench.shown in fig 8

fig 8 solid base bracket

DRAFT ANALYSIS OF SOLID PART

fig 9 draft analysis of solid body

The figure shows the draft analysis of base bracket it show inverse draft

PUBLICATION

TREE STRUCTURE WITH DIFFERENT VIEWS