METHOD AND DIE SET FOR FORMING BODY PARTS Russian patent published in 2006 - IPC B21D22/10 B21D22/24 B21D28/24 

FIELD: manufacturing processes and tools for drawing body parts of flat thin-sheet metallic blanks.

SUBSTANCE: method comprises steps of pressing blank along flange to rigid die; drawing blank by means of shaped punch at punching hole in it; beading hole and finally forming part. Drawing process is realized by two stages. At first stage bottom of blank is drawn along elastic shaped punch at pressing blank along flange to rigid die without elastic deformation of punch. At second stage part is finally formed with use of rigid insert being punch-die for deforming blank at elastic deformation of shaped punch. Blank is deformed in such a way that its deformation propagates from blank center to its periphery. Then blank is turned inside out, hole is punched in it and it is beaded by means of said rigid insert. Die set includes holder, rigid die, shaped punch, rigid insert (punch-die) for punching hole, beading it and finally forming part. Shaped punch is made of elastic material and it is mounted on bottom of rigid die cavity. Rigid insert (punch-die) is made according to condition providing deformation of blank caused by elastic deformation of elastic shaped punch in such a way that deformation of blank propagates from blank center to its periphery at turning blank inside out.

EFFECT: lowered metal consumption, increased strength and rigidity of product due to using plastic properties of blank metal, improved quality of front surface of product.

2 cl, 2 dwg