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AIM Create the Bumber plastic component through the given Class-A surface and perform Draft analysis. THEORY CLASS A SURFACE: Class A surface is a surface made by the designer specially in automotive design which is the aesthetic part of a body and is given as an input to the plastic designer to work on it. CLASS…
NAVEEN KUMAR
updated on 27 Feb 2023
AIM
Create the Bumber plastic component through the given Class-A surface and perform Draft analysis.
THEORY
CLASS A SURFACE: Class A surface is a surface made by the designer specially in automotive design which is the aesthetic part of a body and is given as an input to the plastic designer to work on it.
CLASS B SURFACE: It is a surface which comes below the class A surface with a particular thickness. This surface contains engineering features of a model.
CLASS C SURFACE: It is the surface which joins class A with class b surface.
TOOLING AXIS: Tooling axis is the direction in which the core and cavity opens. If we are using proper tooling axis, we can avoid adding side cores thus the cost of manufacturing the component can be reduced.
Generally tooling axis is decided from the natural axis of the design, that is, tooling axis is analysed with the x, y and z axis of the system. If the axis doesn’t clear the draft analysis, the next step is to look for the surface in which the drafting axis can be created in such a way that the axis is normal to the surface taken. These are the methods of deciding tooling axis. Bisecting method is the least used method.
BISECTING METHOD: It is a method used to create tooling axis.
Here, I had used axis direction as the tooling axis. Because, Bisecting method is rarely used and not proper method of using tooling axis. Using bisecting method to have tooling axis have many limitations. So, while creating a tooling axis, it is recommended to look for the directions in the axis system to have draft analysis. If those axis system doesn’t clear the draft analysis look for normal to surface to have a tooling axis.
DRAFT ANALYSIS: From draft analysis, we can verify draft angles, examine the angle changes within a face, as well as locate parting lines, injection and ejection surfaces in parts.
Draft analysis in Catia:
Step 1: Ensure that customize view parameter is enabled and material mode is opted in view mode customization.
Step 2: Now go to insert > analysis > feature draft analysis.
Step 3: Drag axis bar to the tooling direction of part.
Step 4: Check for draft.
Surface will be in green if the draft angle is more than 3 degrees, blue if draft angle is between 0 to 3 degree and red if draft angle is less than zero degree.
Three degree is the nominal value for draft, whereas 0.5 degree can also be manufactured at ribs.
OBJECTIVES
PROCEDURE
Creation Of Class A Surface
Creation Of Tooling Axis
Draft Analysis Of Class A surface
Surfaces obtained are all green in color, which means that the surfaces are clearing the draft analysis.
Creation Of Class B Surface
Creation Of Class C Surface
Creation Of Closed Surface
Draft Analysis Of Plastic Component
Screenshots Of The Solid Model With The Proper Color Code Of The Draft Angle In Various Orientations
Class A Surfaces obtained are all green in color, which means that the surfaces are clearing the draft analysis. The faces that are obtained in red will be clearing in core side, as the draft direction is reversed, those red faces will be turned to green which means those surfaces are also clearing draft analysis.
CONCLUSION
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