DESIGN AND DRAFT ANALYSIS OF SWITCH BEZEL

DESIGN AND DRAFT ANALYSIS OF SWITCH BEZEL:

OBJECTIVE:

• The objective of the project is to create the class B and C surface for the Base bracket with the given Class-A surface to design a component and carry Draft Analysis by creating the tooling direction for the given Class-A surface.

DESIGN A COMPONENT USING B & C - SURFACE:

• Class-A Surface:
  • It is the outermost surface of the automobile which gives aesthetic look to the vehicle. it is physically touchable. It is obtained from clay modelling by reverse engineering. This surface is given input to plastic product designer to work.
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• Class-B Surface:
  
  • This surface is created by taking offset of 2.5mm from class A surface. It is the surface on which all engineering feature like screw bosses, dog house, ribs & mounting are created.
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• Class-C Surface:
  • This is the surface that joins class A & class B together.
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• Joining the Class A & C Surface
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• Trimming the Class B & C surfaces and get the final trimmed base bracket closed surface
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• Solid Model is created in part workbench by using Close Surface command
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DRAFT ANALYSIS:

• INTRODUCTION:
  • The Draft Analysis command enables you to detect if the part you drafted will be easily removed. This type of analysis is performed based on colour ranges identifying zones on the analyzed element where the deviation from the draft direction at any point, corresponds to specified values.
  • Tooling direction is the main consideration for plastic part and mould parts because it defines the movement of the mould part and the possibility of the plastic part coming out from the mould part (Core and Cavity).
• What is Draft?
  • Draft is providing angles or tapers on product features such as walls, ribs and bosses that lie parallel to the direction of release from the mold eases part ejection.
  • Draft allows for the parts to release from the mold.
  • Draft is required on all parts in the direction of mold movement in order to allow parts to release or eject form mold properly.
  • Draft is the angle in which the parts is tapered to allow it to release. As the part cools, it tends to want to shrink to the core side of the mold.
  • Adding draft helps the part to release. Most parts or applications require minimum of 1/2 to 1 degree, however 3 degrees is widely accepted as the norm.
• DRAFT ANALYSIS:
  • For plastic parts, the nominal angle value for draft analysis is 3 degree but even a 0.5-degree angle can be created for sub-assemblies like ribs and slots. (For Sheet Metal 7 degree angle is the nominal value)
  • Insert - Analysis - Feature Draft Analysis.
  • Draft analysis was carried out by pulling the compass to the tooling axis and an inverse draft axis was carried out if required.
  • After setting the compass over the tooling axis the compass must be locked to a specific direction.
  • If the surface was in green then the model passes or else further operations need to be carried out.
• PROCEDURE:
  • First the class - A surface is checked before creating the Class-B&C surface and finally the solid body must be analysed. Both can be done by following the below procedures.
  • By changing the view mode to custom view parameters - Material mode then the feature draft analysis is enabled.
  • Then the compass was activated and placed with the tooling axis by dragging the red pointer and then locked it.
  • Then, by selecting the quick analysis mode, the nominal value will be 3 degrees and checked for the component's draft angle.
  • The green colour area shows that it satisfies the 3-degree draft angle. If not satisfied then by using the Running point tool the area is measured and then altered to get a successful draft for the created tooling direction.
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