Week 8 - Challenge 1 - Draft Analysis on a Fan Cover
Create the tooling axis for the given Fan cover model to know weather the fan cover is manufactureable or not by performing the Draft
analysis on the model.
What is the draft?
it is defined as a modeled parts to make thwm easier to remove from molds. there are two of determining the objects to
draft either by explicitly selecting the natural element,which makes the application detect the approximate focuses to
use
major industries use the minimum draft angle is 3 degrees.
PROCESS:
First we check the continuity of the given first class -A surface
check the directiopns (X.Y,Z) axis and finally we decoded which is the best possible direction to produce a mold that
direction of the axis is called dummy tooling axis
a fan with several drafted surfaces that is oriented in a part location that the draft analysis initially assumes z-axis
direction
in z-z axis direction the faces are either positive or negative draft . so that the z- axis we have taken as the summy
tooling axis we nees to crate to a perfect tooloing axis.
PROCESS:
TOOLING AXIS defined as thr direction in which the mold opens or closes the core cavity
create an axis system on a ppoint.
create an intersecting line on zx plane and a cass-a surface
Pulling direction: The direction corrssponds to the reference from which the draft faces are defined
Draft angle: this is the angle that the draft faces make with the pulling direction . this angle may be defined for the each
faces
Parting element: this plane, face or surface cuts the partin teo and each portion is drafted accordingly to its previously
defines direction
Neutral elemnent: this element defines a natural curve on which the drafted face will lie. this element will remain the
same during the draft the neutral element5 and parting element may be the same element
STEPS:
for checking the gaps present in it shape design , use join and the boundary options
use the join feature and select the fan cover . if there are any gaps we will get lines on tjhe model
use boundary option to get the lines at the boundary of the fan cover.
later we define the tooling axis for zx plane . to do this we have the intersection of both the plane and the fan cover then we draw lines by point -point
method on both the sides then we will have the other line which bisects both lines in z direction.
now e do the same process for the zy plane.
after having the bisecting lines for both the planes finally we will have the tooling axis for the fan cover by having the bisecting line for the
other two bisecting lines.
to do draft analsys go to insert and analsys and them to feature draft analysis. after that make sure that the model is in customization mode
and the shading should be in material mode.
after selecting the draft analysuis we get these two dialogue box in the first row, two modes are displayed
the second row is displayes amd the thired is direction, using the modes we can use drafting angles at the maximum
and the minimum angles
the display is done using background light analysis in the direction we can use the direction axis and lock it.
to make it understandable we will change the draft limtis.
after changing the draft limits to 10 deg the cover shows red color.
the red color indicates that the cover can not be manufactured. It's because the draft angle is not in the limits.
in this way draft, analysis is done.