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AIM Create the Coin Holder Plastic component through the given Class-A surface.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. the Thickness of the component to be 2.5 mm REPORT CLASS A SURFACE…
Gaurav Yadav
updated on 17 Feb 2023
AIM
Create the Coin Holder Plastic component through the given Class-A surface.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. the Thickness of the component to be 2.5 mm
REPORT
CLASS A SURFACE
In automotive design, a class A surface is any of a set of free form surfaces of high efficiency and quality. It gives the aesthetic of the component which is created by the styling team and gives to the part design engineer to create the part with all engineering aspects.
We have been given the Class-A surface and the first thing to do is to make sure that the given surface has no gap in between them. We can check it visually and also with help of Join or boundary commands.
The given surface has one boundaries which are one outer boundary. So, there are no other gaps found.
TOOLING AXIS
The direction in which the mold or core and cavity opens is the tooling axis.
Dummy tooling axis
By checking the all three axis the best tooling direction is determined.
there is bin shaped area and wall around it .it is a major consideration for dummy tooling axis.the walls are almost 90 degree to surface. so the tolling axis should be perpendicular to flat base of bin area
created point on extracted base surface and a perpendicular line is drawn and Dummy tooling axis created
TOOLING AXIS USING BISECTING METHOD
Tooling axis for the part is created by using the dummy tooling axis using the bisectiong method .In order to check whether the part is toolable in the direction,the class A surface is analysed and the walls which are doubtful of clearing the 3 degree draft angle to the dummy tooling axis is identified.
an axis system is created on point to take intersection
first intersection is taken on yz axis
lines are drawn atthe walls which are almost parallel to dummy tooling axis
bisecting lineis drawn to this two lines
second intersection is taken along xy axis
lines are drawn atthe walls which are almost parallel to dummy tooling axis
bisecting lineis drawn to this two lines
TOOLING AXIS is created by bisecting the axis created on two intersections which is same as dummy tooling axis
DRAFT ANGLE
When developing parts for plastic injection molding, applying a draft (or a taper) to the faces of the part is critical to improving the moldability of your part. Without it, parts run the risk of poor cosmetic finishes and may bend, break, or warp due to molding stresses caused by plastic cooling. Equally important, an absence of draft may prevent parts from ejecting from the mold, damaging not only the parts but possibly the mold itself—a costly and time-consuming detour.
DRAFT ANALYSIS OF CLASS A SURFACE
Change the view to material mode for draft anlysis
draft analysis is done using featured draft analysis tool
Use the compass fucnction to aling the compass to the tooling direction and lock the direction using lock function in the draft analysis tool bar
the surface is showing green colour so that the surface clears the minimum draft angle of 3 degree
By using the analyses under the running pointwe can check draft angle on the individual faces. It shows how much draft on specific points when we move the cursor point.
Green colour - above 3 degree positive draft
Red colour -between 3 and 0
orange colour- below 0 degree
CLASS B SURFACE
CLASS B SURFACE
Class-B surface means the thickness of a part it is not visible and is inside part. In other words, the Class-B surface is a surface below a certain thickness from the class-A surface. This is the surface that contains engineering aspects of a model.The Class B finish is a quality finish with only minimal imperfections. A Class B finish is the most common finish for exterior surfaces. It is normally specified on surfaces such as external covers, panels, and parts that are fairly prominent.
BASE
extracted the surface
untrim the surface
Extrapolate the surface
Trim the surface
offset to the thickness
BASE is created
SIDE WALLS
extracted the surface
untrim the surface
Extrapolate the surface
Trim the surface
offset to the thickness
Fillet is provided and SIDE WALL is created
TOP WALL
extracted the surface
Extrapolate the surface
offset to the thickness
extracted the surface
untrim and Extrapolate the surface
offset to the thickness
OUTER FLANGE
extracted the surface
Extrapolate the surface
untrim the surface
Extrapolate the surface
Join the surface
offset to thickness
splitthe surface for trimming
trimming the surface
Join the surface and OUTER FLANGE is created
FINAL TRIM
Fillet is provided
CLASS B SURFACE is created
CLASS C SURFACE
The surface that joins class-A and class-B surfaces are class-C surfaces. Class C is often specified for interior surfaces not readily visible, surfaces that will be covered by another part when assembledThe Class C finish allows more imperfections than Class A or B. 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.
CLASS C SURFACE
The first step is to create the boundary of the CLASS-A surface
boundary is extracted
reference curve is extracted
c surface is created is using sweep function
C SURFACE IS CREATED
COMPONENT
trim class B and Class C
Join with class A
COMPONENT IS CREATED
TREE STRUCTURE
PART BODY
Close Surface feature usedto make a solid body from the surface
DRAFT ANALYSIS OF COMPONENT
Change the view to material mode for draft anlysis
draft analysis is done using featured draft analysis tool
Use the compass fucnction to aling the compass to the tooling direction and lock the direction using lock function in the draft analysis tool bar
the surface is showing green colour so that the surface clears the minimum draft angle of 3 degree
By using the analyses under the running pointwe can check draft angle on the individual faces. It shows how much draft on specific points when we move the cursor point.
Green colour - above 3 degree positive draft
Red colour -between 3 and 0
blue colour- below 0 degree
CONCLUSION
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