Superforming is a hot metal forming process that uses similar principles to thermoforming plastics, where a sheet of material is heated and forced onto a male or female superform using air pressure. There are 4 main types of superforming: cavity, bubble, backpressure, and diaphragm. The process is useful for producing complex surfaces.
Types of superforming:-
1)Cavity forming is good for large and complex parts such as automotive body panels and is excellent for shaping 5083 aluminium alloy.
2)Bubble forming is suitable for deep complex components, especially where wall thickness needs to remain relatively constant. This process can be used to manufacture geometries that are impossible to achieve using any other forming process.
3)Backpressure forming process was developed to produce structural aircraft components in 7475 alloys. Although similar to cavity forming, the process differs by using air pressure from both sides of the sheet. It is gradually pulled on the surface of the tool using slight pressure differential. This maintains the integrity of the sheet and means that "difficult" alloys can be formed.
4)Diaphragm forming is used to shape complex sheet geometries in non-superplastics alloys such as 2014, 2024, 2219 and 6061. making the process ideal for producing structural components.
Superforming process is used to create complex sheet geometries from a single piece of material and this process has been rapidly growing in many applications, including aerospace, automotive, buildings, trains, electronics, furniture and sculpture. 
- Thompson, Ro. Manufacturing Processes For Design Professional. : Thames & Hudson 2007110.
- Rob Thompson. Manufacturing Processes For Design Professional. Thames & Hudson
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