sheet music - game/sforzo

[meccanicamg]

Good evening, everyone. I need to find a law or if you have experimental curves, to determine the multiplicity factor of the pulling effort according to the punzone/matrix game.

normally, it assumes that the single side game matrix/punzone is of 8%~20% for increasingly hard materials to chew. normally the formula of the single side game keeps in mind the thickness and the breaking load g=0.007*s*(rt, festal) ^0.5 (lightly different for thicknesses +/- of 3 mm).

Now if I have na rt sheet,cut 400 mpa from 10 mm to cheat it would take 1.4 mm of punzone matrix game and assume k = 1 where the press uses all its strength to pull. Obviously if we increase the game we can do it up to a limit (such?) of tranciability and therefore k < 1 and the press exercises less strength. if the game is reduced (up to how much less?) the force increases significantly and therefore k > 1.

real pulling force f = fteorico*k with incorrect theoretical force fteoric = perimeter*thickness*rt,cutting Can you give me some sensible parameters?

 

[meccanicamg]

searching the internet I found that someone did some experiments about it and what I found is qui However, as you can see, you do not understand very well the values that take the forces vertically.

I ask you moulders if you have never sampled thickness/resistance/game/strength stamping or hairstyle and if you have absolutely nothing in your hand that relates these quantities.

from how I see it I should have that:
- calculated the game g from above formula I should expect a k = 1
- by decreasing the game g should increase my strength up to k >1 or go endless? seems to be at some point when it arrived at the max k then retracts despite g increases
- increasing the game g should decrease the strength up to k < 1 but at some point it seems to rise
- looks like the k/g curve has a synepatheid pattern

What do I miss to be able to put down two sensible formulas or any of the sensible data with their laws?

after 60 readings of my post can no one be able to give me an answer? Are my questions always so specific not to find feedback in users? I think that's what it's for and interests all those who need to size presses to pull something that's not cellarers... or is it wrong?

do you say that if I solve the system of forces here below I can find the law that determines the synepathetic trend between force and play?

 

[meccanicamg]

su handbook of fabrication processes di orville d. lascoe in the google public pages I found some interesting things:
- pulling force f = l*t*t* where l = perimeter cut you, t = thickness, s = cut break load
- the above force must be corrected depending on the material to be cut/drawn with a k because it varies the collaboration of thickness t during fracture

- if you have more punching, lubrication works as a shadow effect and does not sum the efforts of all punches- depending on the material and the punch, the force varies sympatheidally but it is not understood why therefore it deduces that the pulling force could have more game/thickness solutions to have the least effort of the press

 

[Loghin]

france must be 5% (and not 8%-20%)
Tropa theory to calculate efforts that do not serve anything for the giocco trancia (serve only to establish the press and to dimensional premilary springs).
As a profession you are.
. engineering project manager & mechanical project engineer.
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[Biagio57]

Hello everyone
I allow myself to enter into debating by making my contribution, even if I have not understood exactly what the question you ask.
I will make a summary that I hope will answer your questions.
1) the hairstyle game is decisive for the quality of the cut, the cut wall will turn out with a more or less evident tear with a clean and straight initial zone depending on the hairstyle game.
2) from my experiences and that of my customers who build molds and draw, 10% of the thickness is the best compromise you can get, even if in some particular cases you can opt for 8% or 12% of the thickness.
3) with regard to the pulling effort (without being too much paranoid) the calculation will serve you to determine the extraction of the punches and which press to use for hairstyle. f=l*t*s hairstyle stress (set before) is correct.
4) regarding the extraction of the punches as value keep as good as 10% without asking you other questions that I assure you will be fine.
made these small premises I could add that if it is true that 10% of the value of the hairstyle is good for the extraction of the punches it is equally true that in some cases this value is not enough for the hold of the material to be drawn.
what I have expressed little bits even if it may seem contradictory simply wants to point out that every molding situation is analyzed and with the experience to make all those necessary adjustments to the purpose.
therefore in the future it is better to face a question at a time and to deepen it to analyze the many variables that perhaps at that time they contribute to obtain the best result.
biagio quintieri, owner of ep service

 

[meccanicamg]

the question is more complicated than expected because I have a particular mold where I have a series of matrices and puppets that make cuts without rubbing in the material and at the same time also make a fold, since the punch is progressive to v male convex.
I find myself, for example, having to make a mold with light 0.3 mm in order to be able to draw necessarily different thicknesses from 0.5 mm to 6 mm without being able to change the punzone matrix light. My workmanship should not have a nice break profile, so I don't need precision or special finish but must draw and fold a coarse geometry.So this is why of my question: having a wide range of thickness and resistance that does not meet the classic 10% thick game, how much do I change the overload of the press?I find myself having presses where 1000 ton I need to process this work of which 60 ton dedicated to the extraction/previously of the premier. if I were in the optimal conditions of play I would have about 600 tons in the maximum breaking load conditions and maximum thickness.

all that I'm asking exulating from the classic use of hairstyle, otherwise the usual formula mentioned above would be fine.

I hide as a mechanical engineer, who over the years has made a lot of mechanical design in various sectors and over time has become responsible for a mechanical technical engineering office in the field of sheet metal plants. I manage resources, manage and plan the design work, sometimes I do r&d i.e. research and development of prototypes, other times project machines or sensitive parts of them, sometimes I do experimental tests, I assist the production/assembly/work regarding non-compliance.

 

[Biagio57]

In conclusion, if I can help you, send me the job you're doing, I'll give you my opinion.
Bye-bye