calculated efffort extracaction rifila

[c_roberto_2007]

Good morning.

to calculate the force necessary to extract a punch from a primer, and then decide which springs or cylinders to use, I should use
a formula of this type :

p (length perimeter to be cut off) x s (thickness tracing material) x 40
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
20

I think I miss some detail. . .

 

[ziotoy]

the load you have to put on the premilla will be 10% of pxsx40, without the friar 20.
Say hi.

 

[roberto2074]

the load you have to put on the premilla will be 10% of pxsx40, without the friar 20.
Say hi.

mmm, I remembered there was a sort of k coefficient that varied depending on
of the hand-drawn material was iron, aluminum.. .

therefore to make an example, if I have a hole ø10 p = 31.41 s=2mm x 40 = 2512.8 *10% = 251.28 kg

 

[ziotoy]

Esato.
Saluted.

 

[promecvergani]

Are you okay, but is it experience or have you copied it?

 

[meccanicamg]

from the great book of punching and similar processing "handbook of die design, second edition - mcgraw-hill" There's what's shown below.

to make the cut, the force is given by a constant of the material yielding load, thickness and cutting perimeter. everything is varied if you have a cut angle of the punch different from 0°.

Instead, for the primer it is necessary to consider a force necessary to maintain the firm material, without sliding to allow the punching and is here attached the formulation according to the material thickness. in practice is a % of the punching force.

 

[promecvergani]

cutting perimeter x sheet thickness x sheet cut effort type = pulling or threading effort
effort to extract blocking molds 10% straining effort at the top and 4% in the bottom extraction
10 per cent of the pulling effort and long-lasting moulds double for safety the load of rubber-molles or extraction cylinders.With the waxing of the punches, the pulling effort is decreased according to the table above correctly reported by mechanicalmg