Strain Zones and Attrition Influential Zones in Tube Hydroforming Process
132201-6767-IJMME-IJENS © February 2013 IJENS I J E N S Abstract— A fluid tube forming procedures are applied towards optimization of techno-economical parameter production. A basic principle is utilisation of the material ductility in the stability range of a certain forming operation. Besides of the manufacturing optimization of tube forming, like this it is achieved: better quality, mechanical and structural properties of the work pieces, material and energy savings. During the process of tube hydroforming, and with an analysis of the stress-strain states, fig. 3., four characteristic zones have been determined to exist: principal tube zone, passing tube zone into the drainage, drainage zone (stresses of pressure and stretching) and top drainage zone (stresses of stretching and pressure). The areas of attrition functioning in the process of tube forming, fig. 2., can be separated in four different influential zones: a flow zone, passing zone, expansion zone and protraction zone. Knowing the attrition coefficient in the influential zones gives the opportunity of strategy development for its decrease. This paper provides a determining model of attrition coefficient in tube hydroforming.