design cutting moulds (by step)

[Matricola_Gigi]

Excuse me, will you give me some insight into the construction of the punches?

 

[meccanicamg]

Excuse me, will you give me some insight into the construction of the punches?

Hi, gigi. Your question is a little generic.
However you take a reclaimed, you grind it, you send it in vacuum tempering with double tempering and then rectification. Usually you do so with x155crv.... especially if you have to dress with pvd or cvd.
otherwise with wolframio bars you work finished and laser tempt the cutting edge.
then in the specific if you ask for form and function we can tell you more.

 

[Matricola_Gigi]

Sorry, I was vague.
I'm talking about punches with and without head.
when it is convenient to use the punches with head and when those without?
Thank you.

 

[rinato]

logic would always want punches with head, because you drain pressure on a larger area and you have more space for screws etc.
but they can cost more as construction and also place some mechanical bond in addition to the mold itself, during assembly and maintenance, but they are all a little long to explain.

ps: I realize only now that this debate has been protracted for an exact year: are you sure you'll get a spider out of the hole?

 

[Matricola_Gigi]

ps: I realize only now that this debate has been protracted for an exact year: are you sure you'll get a spider out of the hole?

true eh:wink:
in a year I entered the workshop once... you are

 

[meccanicamg]

true eh:wink:
in a year I entered the workshop once... you are

you are not well put....but have you produced and designed something or make you fold the printed sheets?

 

[rinato]

you are not well put....but have you produced and designed something or make you fold the printed sheets?

and mind that there is a norm also for how to fold the sheets.. .

 

[Aiepa]

Hello, everyone.

I read the whole conversation a bit, but I have a doubt about the thickness of the plates of the matrix and the punch.

If I understand correctly, it should be:

the formula that is used as first sizing for the punch plate is defined by the following formula:

.

Right?

I have a fixed force press (can not be changed) of 80 tons. but with this calculation the thickness of the punzone port is very high.
What am I wrong?

 

[meccanicamg]

80000kg cubic root makes 43mm. I'd say it's too little.
I don't know what's wrong with you not writing numbers.

 

[meccanicamg]

sure that it is not the thickness of the matrix and the punch but of the plate that welcomes and guides the head of the punch.

keep in mind that if you make 10 holes diameter 10mm on a s275jr plate thickness 5 mm and a lot of 35% primer force we reach 80ton of press. do not want to drive 43 mm of cylindrical underhead of a 10mm diameter punch? the punch will have an increase of about 16mm...16 x 2 = 32....poco far from 43mm.
What do you see strange?

 

[meccanicamg]

Another reflection is that if you have an 80ton press and you are very sure that you will never use more than one certain threshold, example 30ton...calculate then with 30ton.
it happens to have huge presses and then thread for trials or small samples from little effort.

 

[Aiepa]

sure that it is not the thickness of the matrix and the punch but of the plate that welcomes and guides the head of the punch.

keep in mind that if you make 10 holes diameter 10mm on a s275jr plate thickness 5 mm and a lot of 35% primer force we reach 80ton of press. do not want to drive 43 mm of cylindrical underhead of a 10mm diameter punch? the punch will have an increase of about 16mm...16 x 2 = 32....poco far from 43mm.
What do you see strange?

Yes, indeed.

I am trying to make a step mold for support brackets (n° steps 2), in a first phase the punch will remove the friction of the hole and the exhaust throat of the bracket, in the second step will draw the profile of the bracket.

we chose a thickness of 3 mm for aluminum, and the offset of 7%.
We don't need a fine hairstyle, so there's no primer. (although in my opinion it facilitates molding )

Finally the press has a tax and non-variable force of 80ton.
So I was trying to figure out the thickness of the matrix and punch and bandage to not break it to the first pass.

Can you help me?

 

[meccanicamg]

to say the true fine hairstyle has a counterpoint and sealing dentelli and the material is handed out extruding it with the punch.
the formulas are those indicated before.
then it is necessary to check how normally it is done in mechanics with internal tensions, contact pressures, sigma, tau...ecc etc.
They usually have to be done by those who do it. There can be so many things that are not good in the design of a mold.

 

[rinato]

Yes, indeed.

I am trying to make a step mold for support brackets (n° steps 2), in a first phase the punch will remove the friction of the hole and the exhaust throat of the bracket, in the second step will draw the profile of the bracket.

we chose a thickness of 3 mm for aluminum, and the offset of 7%.

Hi, I'm going to "restore a little power": you have got chosen to make this 3mm thick brackets? Did you synthesize or did you just "eye"? because it sounds bad to me, much more than aluminum. what is al99.9% or avional?
don't you have examples of molds in your home to inspire you?

(and, however, the "end" trancitura must be justified because more expensive both of equipment and of actual molding)

then, for charity, do as usual site, far from me give lessons.

 

[SHIREN]

Hi, I'm going to "restore a little power":


then, for charity, do as usual site, far from me give lessons.

Hello again
in every "mestiere" there are more or less common practices
but it is also true that there are different experiences
in our community every single user
port
it helps us to understand how to solve a problem
then it is to those who asked us to help a council a comparison a debate
assess whether or not our sense of community
Thank you very much

 

[rinato]

hi shiren, maybe I felt bad: I didn't want any money, or worse to tease, the work of alepa.
then, for what I can contribute, I have already given in the 55 previous pages. If I add something or wrong, or I contradict myself, yes...