Paper Details

Hydroforming is technology which is based on influence of fluid under high pressure to the inner or outerside of work piece wall. Implementation success of hydro forming process depends of a correct election of: die, material,fluid pressure and other process parameters. Hydroformig process should be implemented by using optimal parametersof the forming process that would allow stable and successful hydroforming process. Sheet metal forming by fluid underpressure is applied in deep drawing, stretching of sheet, hydroforming of welded sheets, hydroformig with metal heatingetc.The basic tendencies of development of sheet metal forming process by fluid under pressure are to be improvement ofsheet deformability, improvement of tribological forming conditions, optimization of forming process, development ofnew forming processes and new materials, automation of forming process, application of flexible tools, andimplementation of flexible and intelligent systems. Hydroforming is a cost effective method of shaping metals intolightweight, structurally stiff and strong components. The automotive industry is one of the largest applicators ofhydroforming, which makes use of the complex shapes possible by hydro forming to produce stronger, lighter, and morerigid unibody structures for vehicles. The hydro forming manufacturing technique is frequently employed in the shapingof aluminium tubes for bicycle frames and sheet metal panels. Hydro forming uses a specialized type of die combinedwith high pressure hydraulic fluid to deform the metal at room temperature into a shape forming die. Hydroformingallows complex shapes with concavities to be formed, which would be difficult or impossible with standard solid diestamping. Hydroformed parts can often be made with a higher stiffness to weight. Virtually all metals capable of coldforming can be hydroformed, including aluminium, brass, carbon and stainless steel, copper and high strength alloys.Inhydroforming sheet there is bladder forming (where there is a bladder that contains the liquid, no liquid contacts thesheet) and hydroforming where the fluid contacts the sheet (no bladder). A work piece is placed on a draw ring (blankholder) over a male punch then a hydraulic chamber surrounds the work piece and a elatively low initial pressure seatsthe work piece against the punch. The punch then is raised into the hydraulic chamber and pressure is increased to untilthe pressure forms the part around the punch. Then the pressure is released and punch retracted and hydraulic chamberlifted and the process is complete. This paper represents advances in sheet metal hydroforming technology

Dr.R.Uday Kumar, “ADVANCES IN SHEET METAL HYDROFORMING TECHNOLOGY”, International Journal of Advance Engineering and Research Development (IJAERD), Vol. 4, Issue 6, pp. 714-721, June 2017.