deep drawing sheet metal problem

[fsa]

hello engineers,

i am facing a problem from last 3 days to making a this part (see jpeg attached with this post) i want to know that how can make this part.i try 2to 3 dies for making this part but every time the punch just making a hole in the blank sheet.not complete draw .can any one tell me how i can the deep drawing die for this part.

thanks

asif,fsa

[ironlung29]

I might be able to help. I need some more information.

Are you using a conventional die, punch and blankholder?

What kind of material are you trying to form?

What shape is the blank(square/circle)?

What size is the blank?

What is the material clearance in the die?

What is the size of radius on the draw die?

Are there wrinkles in the failed parts?

What is the surface finish on the blankholder and die?

What type of lubrication are you using?

What type of press are you using(single/double action)(hydraulic/mechanical)?

Are you attempting this form with multiple draws or just one?

How close to the bottom of the draw can you get? Does the punch go thru at first contact of the blank or does the bottom rip out half way down or near bottom?

If you can post a picture of the failed part I may be able to see some problems.

[gridley51]

One more question.Are the dimensions metric or imperial?

[fsa]

respected peoples
i am sending all the details answers of asking qustions and also upload the jpegs of faild part and the die which was i used for draw.

all dimensions are in matric.

and thanks for reply.

asif FSA

[fsa]

please check the answer urs questions also posting the details of die and part


I might be able to help. I need some more information.

Are you using a conventional die, punch and blankholder? yes

What kind of material are you trying to form? ss-316

What shape is the blank(square/circle)? circle

What size is the blank? 25mm

What is the material clearance in the die?.1mm

What is the size of radius on the draw die?

Are there wrinkles in the failed parts? no

What is the surface finish on the blankholder and die? general

What type of lubrication are you using? simple grease

What type of press are you using(single/double action)(hydraulic/mechanical)? hydraulic

Are you attempting this form with multiple draws or just one? one

How close to the bottom of the draw can you get? Does the punch go thru at first contact of the blank or does the bottom rip out half way down or near bottom? approxi mate 3to 4 mm draw

If you can post a picture of the failed part I may be able to see some problems sending a picture please check attachments

[ironlung29]

Looking at the second photo of the failed part it looks like your blankholder pressure is to low.

On the first photo when the part failed at a shallower depth was the flange starting to get wavy?

[scott0031]

Fsa,

can you post some clear pictures of the dies/formers you have made. You mention you have made some others sets up previously. I'm a what we call a press toolmaker here in England.

I have some ideas i can put your way but some pics of what you have already tried in the way of formers would be a help so i don't already cover what you have tried. Basically for starters its 316 stainless steel which is very resistant to bending and about any ones worst night mare to work with. The problem is the stainless blank is too resistant to the pressure being applied to form it,(dependant on the form entry) hence its piercing a hole rather than drawing the material into the female form. So you need methods to lessen that force, which is resolvable. Post some pics of the forms you have already tried and i will try to point you in the right direction.

Scott

[fsa]

thanks to u Mr scott0031 i am realy pleased to see ur post .ok i send to more pictures of the damage prats as soon ass possiable.and also

[tfarry2]

FSA, Did you ever fix your problem with drawing stainless part?