i do not understand the procedure for the sizing of this exercise

[Arhad]

ahimè I received this sheet printed by a pdf, which I can not even find and I would like to understand how it is possible to do it, I checked online resources and everything but I don’t even know how to do it.

exercise


sizing and static verification of a welded flange for hydraulic cylinder


object.
an adjustable hydraulic cylinder must be applied to a static and fatigue test counter on industrial components.


for the maximum versatility of the system, it is assumed to want to perform tests with maximum forces exeroted from the cylinder both in shooting and in thrust. Moreover, it is assumed that the cylinder is in horizontal and vertical direction, and in any intermediate position between 0° and 90° on the horizontal.


Suppose you want to connect the cylinder to the counter with a fixed zipper applied to the back bottom, with bb configuration of the figure of page 1 attached 1.


the maximum rated load values to be applied are p [kN]=~14 kn, feed pressure p [bar]=100 bar and piston run is l [mm]=300mm.
data already decided

is required:
•choice of the cylinder adapted to the data provided, in terms of aleage and stem diameter.

choice stem diameter from stroke l and load p ( diagram p. 2 attached 1)

• choice alesaggio cylinder starting from the stem diameter, operating pressure and p load
  (Table 3 Annex 1)
• valuation in bulk and perri to the cylinder bottom from the tables of page 4,5 attached no1.

• Static size of welded flange and 4 flange connection bolts
at the counter.

• Static verification of welded flange and welds with static safety coeff. vs. 3, in the two intermediate positions 0° and 90° and at least one intermediate

•checks the bolted connection in the two extreme positions 0° and 90° and at least in an intermediate, with static safety coeffs vs > 2.

• functional set design for cylinder and flange with indication of the cylinder end action field.

•constructive design of the welded flange with indication of the processing and tolerances and with distinct pieces and materials of the connection.

 

[ragnol]

ciao @arhadI saw you sign up this morning. I didn't check, but I guess you didn't show up and you didn't read the rules.

If you ever return to this 3d, don't expect someone to attach you a pdf ready to print.

you have published the text of the exercise. What do you know and what you can't do? Do you understand what the "body" is like? you schematized it, to evaluate the forces at stake, at least in 3 positions as required (0°, 90° and suppose 45°)?

Can you attach sketches and calculations you've done so far? because once you have identified the forces acting in the various positions, you can start dimensionalizing and verifying the required elements.

but you show your material, and proud of technicians here will help you move forward and/or correct where you are wrong.

I attach you two photos, a double effect piston (push and pull) and a anchoring bracket at the base, like what they require to you, in case you didn't really understand what the exercise is talking about (but it would be a little serious premise, no?!).

post your material, up to a certain point I can help you too wanting, but it is full of well-prepared engineers.

ps: I am aware that I have written, probably, to myself.

 

[DoctorBomber90]

attach all images of your pdf. so that you have clear any drawings and/or patterns.

 

[meccanicamg]

copying the text without the pictures and graphs to which the requests refer, I would say it is as if I had not posted anything.
all exercise you can solve it with volume 1 of niemann.
As for cylinder sizes, ales, stems and hinges you can look at an online catalog, if you do not have all the references on pdf.
example grices makes iso cylinders and welded. on the pdf catalog you can see that stems are available for every alexion so that the forces of shooting and thrust are consistent with the demands of the exercise text.
the so-called flange is nothing but the rear fork which has 4 fixing holes.
this object need to check the pin, the compasses if present.
other material to use is eurocode 3 uni en iso 1993-1-8.

so now it is up to you to put a reasoning, a pattern etc. then we discuss it.

 

[meccanicamg]

just because it can't be done without... the data imposed there is f≈14kn at 100bar. It assumes itself in push... there is no standard alesage that does neither 40 nor 50. or too much or little.

if you consider instead the force in shooting you can stand the 63/45 but in push surely it is much more.
as always....the indications in the text are always bringing mistakes.

otherwise take a nice pressure regulator and place it so that in push you do not work at 100bar but work at 48bar.

That's a good reasoning.

usually check the tip load on the stem according to the fixing constraints and it occurs that the chosen cylinder goes well or not.

made this you should get to choose the catalog flange, to be melted and to realize as three welded pieces on which to make the checks pin / bushing and on the vertical flat welds with base flange.

then the total reactions of the base flange are determined and they are seen on the 4 screw fixings that are to be sized.
you can evaluate traction/compression, cutting, rewinding flange and friction flange/table.

I'm doing hand exercises go away a couple of hours... especially if you don't know the basic knowledge of construction science and you need to recover the theory of everything.

As for an en 1993-1-8 you can find on the forum the summaries for bolts and welds, even if I recommend you read the rule in full.

if you just can't/you can't find the old one cnr 10011 withdrawn for a long time, which is on the internet and you could make us a more "classical school" reasoning.

 

[ragnol]

I'm afraid even this time... .