Research On Electric Hot Incremental Flanging Technology

Sheet metal flanging as an important board material forming process is widely used in theautomotive, aerospace, shipbuilding and other manufacturing industries. Traditional flanging usuallyuse die forming which cost too much and need a long time to produce, especially flanging of thedifficult molding material at room temperature such as TC4,a additional dedicated heating device isneeded and processing technology more complex. Use electric hot incremental forming technology inTC4sheet flanging can respond quickly to market demand, and the equipment is simple and easy tooperate. In order to achieve the application of TC4titanium progressive flanging, experimental studyon the technology of TC4sheet flanging by electric hot incremental forming technology is carried out,the main contents and conclusions are as follows:1. Tool diameter, current, feed rate, step size and the thickness of the sheet metal will affect theprocessing temperature of the TC4sheet when flanging by electric hot incremental formingtechnology; The sheet in flanging can be divided into five section and the stress-strain conditions arediffer in each section.2. Study the impact of process parameters on the flange part quality, proposed a reasonable set ofprocessing parameters and processing. The flange part of TC4sheet usually split at the middle of thevertical wall because of the effects of thinning bands。The usual limit hole-flanging coefficient can notbe used in incremental hole-flanging process to show the forming limit of the TC4sheet. Multistagetool path strategy can improve flanging formability of TC4sheet, but limited performance.3. A new tool path strategy is carried out to improve hole-flanging formability of TC4sheet.When flanging coefficient is small enough flange parts will failure at verticalt angle.First formingangle will affect the thickness of the parts distribution in this new forming method.4. In the non-circular hole flanging, according to the deformation characteristics,the profiledflanging can be divided into three parts of the convex circular arc, a concave circular arc and astraight line segment. After flanging, the height and the thickness distribution of the three parts aredifferent. Non-circular flanging formability is mainly determined by the convex arc.