sheet metal shears

[promecvergani]

I have to design a sheet metal shears mould and that it has to replace in practice the shears class that gives me advice? size stainless steel
if you are able to give me answers and safe data answer me
Thank you.

 

[Tequila]

I have to design a sheet metal shears mould and that it has to replace in practice the shears class that gives me advice? size stainless steel
if you are able to give me answers and safe data answer me
Thank you.

too few technical information to be able to give a useful answer in addition to you, even to those who in the future will look for problems similar to yours.

Start by pointing out what sheet sizes you need to work, thickness, if you need to make a simple linear cut or if this mold serves to discount along the perimeter some product also released from a mold or if incoming from the coils before the molding you just need to cut the sheet piece that will later be worked.

Hi.

ps for moderators: correct the title type error for future searches.

 

[massi481]

depends on the design and what you have to do, otherwise you have to do it as you do
to separate the strip into the double effect.

 

[meccanicamg]

as I understood, it must build inside a mold a guillotine shears to break the material, probably it is a mold that pre-cuts sheet or cut the finished product by separating it from the tape that comes from the feeder.
basically you have to keep in mind that:
- it is good to have a primer not to bend the sheet during cutting and returning the blade
- the cut angle greater than 0° allows a reduction of the force to be adopted for cutting but beyond a certain value distorts too much the sheet and the fold permanently along the cutting width (so max 1.5/2°)
- formulas are those attached to the calculation of the main cutting force, of the lateral cutting force due to the angle greater than 0° and the horizontal repulsion force due to the blade light (kg%)
- kg% i.e. the percentage ratio between blade light and material thickness must be between 5 and 10%. if it is low you have a sharp detachment with crashing on the materials above all unscrupulously surfaces. It is also true that for the unscrupulous materials you can go even more than 10% because they are cut out for cedimento of crashes. for soft materials it is essential to have low kg%
- the portalma (superior and lower) must withstand the f0 force and therefore should not flet, otherwise you will have a biased cut with a bava and a very high power demand to cut
- you must keep in mind the frictions for the calculation of power
- the cutting breakage load for steels is about 0.8*rm