Re: [CAD_CAM_EDM_DRO] Making a punch die?

At 08:03 PM 7/12/01 -0000, you wrote:

>Hi,
>I'd like to make my own punch dies for cutting cutouts for electronic
>connectors in an aluminum case (0.062). Has anyone tried this or
>seen information that might help?
>Joseph

My reference says for 1100/5052 aluminum clearance of 4.5% of material
thickness
for 2024 and 6061 alum. clearance of 6% of material thickness for punching
and blanking,
so 2.75-3.5 thou clearance (per side).

Punch force in lb. should be S(psi) * circumference (in)* thickness (in)

Eg. if the circumference is 3", and the shear strength of the material
(2024-T4 alum)
is 41,000 psi, then it would be 41,000 * 3" * 0.062 = 7626 lb.

Stripping force in tons = length of cut (in) * material thickness (in) * 1.5
in the above example = 0.28 ton.

Source: Die Design Handbook (SME publication)

Best regards,

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