Week 8 - Challenge 2 - Switch Bezel Design
ABOUT SWITCH BEZEL
Switch Bezels in car are parts which contains switches and controls for different functions like Window control, Door lock/Unlock,Media and Temperature controls.
MATERIAL USED FOR SWITCH BEZEL
ABS(Acrylonitrile butadiene styrene)
WHY ABS(Acrylonitrile butadiene styrene)
- COST EFFECTIVE
- LOW MELTING POINT
- HIGH IMPACT STRENGTH
COMPAEISION OF MATERIAL TO CHOOSE FOR SWITCH BEZEL
| Attributes | ABS | NYLON |
|---|---|---|
| Impact strength | High | low |
| Cost | Low | High |
| Melting point | low | High |
| Plastic Type | Thermoplastic | Thermoplastic |
| Properties | ABS | Nylon |
| Melting point | 190 -270 | 268.8oC |
| Density | 1.05 g/cm3 | 1.31 g/cm3 |
| Molecular weight | 211.3 g/mol | 224.3 g/mol |
| Ultimate tensile strength | 35MPa | 85MPa |
| Elongation at break | 30% | 90% |
Comparing ABS and Nylon
| Attributes | ABS | NYLON |
| Plastic class | Engineering | Engineering |
| Impact strength | High | low |
| Cost | Low | High |
| Melting point | low | High |
| Plastic Type | Thermoplastic | Thermoplastic |
| Surface | Smooth | Smooth low friction |
| Variant | Composites e.g. ABS/PVC | Chemical variants e.g. PA 6, PA 6,,6Glass-filled nylon etc |
| Rapid prototyping | Preferred for rapid prototyping. Works in 3D printing and CNC machining. | Less common for prototyping. But can also get 3D printed and CNC machined |
| Natural color | ivory | Off white |
| UV sensitivity | high | High |
| Flammability | moderate | High |
| Moisture absorption | Low | High |
| Dimensional stability | High | Prone to warpage |
| Acid/ Alkali resistance | Good | Poor |
MECHANICAL PROPERTIES OF ABS(Acrylonitrile butadiene styrene)
-
Key Properties of ABS
- High rigidity.
- Good impact resistance, even at low temperatures.
- Good insulating properties.
- Good weldability.
- Good abrasion and strain resistance.
- High dimensional stability (Mechanically strong and stable over time)
- High surface brightness and excellent surface aspect.
MANUFACTURING MACHING FOR SWITCH BEZEL
INJECTION MOLDING MACHINE
TOOLING AXIS
The direction in which the mold or core and cavity opens is the tooling axis
CLASS A SURFACE
- Class-A (or 'Strak') is a term used in specifically in automotive design. It describes the final production surface data for the aesthetic parts of the car. The term 'Class A' is often misunderstood, but it's generally seen as the 'Holy Grail' of surface modeling.
class A surface is used to show to the customer visulization,and it is a aesthetic syurface
CLASS B SURFACE
- 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.
- It is a offset surface of A,Which the surface were can not able to see Over the customer.
CLASS C SURFACE
The 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.
DRAFT ANALYSIS
The draft analysis technique is used to analyze whether our part model created in CAD is manufacturable based on the draft condition applied. Here the part should get easily removed from the panel dies .
DRAFT ANALYSIS OF SWITCH BEZEL CLASS A
DRAFT ANALYSIS OF SWITCH BEZEL FINAL COMPONENT
SCREEEN SHOT OF TREE STRUCTURE
SCREEEN SHOT OF SOLID BODY WITH PROPER COLOUR COATED OF ALASS A,B&C
