03-10-2012, 10:41 AM
HYDROFORMING
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A special type of die forming using a high pressure Hydraulic fluid to press room temperature working material into a die
TUBE HYDROFORMING
Used when a complex shape is needed
A section of cold-rolled steel tubing is placed in a closed die set
A pressurized fluid is introduced into the ends of the tube
The tube is reshaped to the confine of the cavity
SHEET HYDROFORMING
Involves forming of sheets with application of fluid pressure
Metal blank is subjected to hydraulic counter pressure generated by punchs
Required deformation takes place
Note: Sheet hydroforming provides a work-hardening effect as the steel is forced against the blanks through fluid pressure.
THE APPLICATION SPECTRUM
1. Outer skin with its extreme demand of surface quality and dimensional accuracy.
2. Longer outer skin parts for passenger cars, utility vehicles
3. Low capital cost. Fewer and simpler dies.
4. Better NHV (noise, vibration and harshness )factors.
5. Reduction in weight.
7. High process capability.
8. Reduction in cost of component.
ADVANTAGES
Extraordinary Design Flexibility.
Fewer Parts
Less Assembly
Less Weight.
Lower Tooling Costs.
Less Post-Processing
Greater Integrity (pressure flows the metal into corners for greater precision rather than streching)
DISADVANTAGES
Slow cycle time
Expensive equipment and lack of extensive knowledge base for process and tool design
Requires new welding techniques for assembly.
CONCLUSION
Hydroforming is an innovative forming process
Hydroforming is becoming more popular (ie.automotive and aerospace industries)
The advantages outweigh the limitations
Material selection is broad and continues to increase
Information can be found everywhere!