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fractured biellas

  • Thread starter Thread starter Oldwarper
  • Start date Start date

Oldwarper

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I accidentally stumbled on the fractured biellas. in practice, in recent engines the biella are made in one piece, with the rectified hole of the bronzine and then to get the hat is "fracted" the biella with liquid nitrogen.
http://www.quattroruote.it/tecnica/spiegazione.cfm?codice=389apart from the "agonizing" :biggrin: to obtain the two pieces, guarantee a perfect mating, and a very critical workmanship (the header of the two pieces) in less. against the non-interchangeability of girls and hats.

Does anyone know anything more than who uses this (barbarbarbaro:cool:) way to make biellas besides fiat? Are there contraindications?
 
Oldwarper said:
Does anyone know anything more than who uses this (barbarbarbaro:cool:) way to make biellas besides fiat? Are there contraindications?
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I had read about it many years ago on mototecnica, but they were made of steel through sintering powder, and the breakage got at ambiene temperature thanks to some invitations to break.
 
Bye-bye.

I have heard about it but I cannot view the page of 4ruote perhaps browser problems;(

can post some pictures


Thank you.
 
but does cooling only serve to increase fragility and therefore have a break in the elastic field?
 
However looking on google "bielle sintered fracture" comes out very material. For example, even the current bmw boxer motorcycles have the rods obtained by this method (I think it is simply to reduce the cost of manufacture!).
 
RS4 said:
Bye-bye.

I have heard about it but I cannot view the page of 4ruote perhaps browser problems;(

can post some pictures


Thank you.
Click to expand...
is a simple glossary type text:
biella “fratturata”system for which the hat of the head of the biella instead of being obtained “segando” the head is obtained by breaking it along a well precise director. in practice inside the head hole are practiced two grooves. therefore with a hydraulic expansion pin the diameter is forced until it causes the break along the pre-ordered lines. so when the two parts, after the introduction of the bronzine*, will be brought in contact and pulled with the screws, they will fit perfectly ensuring greater compactness.
Click to expand...
 
Oldwarper said:
(cut)
Does anyone know anything more than who uses this (barbarbarbaro:cool:) way to make biellas besides fiat? Are there contraindications?
Click to expand...
I had heard about it (it seems to me for the motorcycle gp) but looking around it seems that even the alpha 159 jtdm and the high-end hearings use this solution.
 
Hello everyone,
reading here and there, I remember seeing that even the link of hats-supports were carried out in this way. if I do not run on motors for cars bmw.
 
Excuse me, but what's the difference between this kind of biella and a classic biella?? what is better and what is worse for you?? :confused:
 
I had seen them anky (not really!) always for small biella (auto/moto). I believe that the main advantage is the possibility of having a centering between the stem and hat without the use of screws with calibrated fats (drawing, expensive).
 
for fractured biella means a biella obtained by forging process or die casting in one piece which is then fractured later in 2 parts according to various ways.

for non fractured biella means the same process but instead of being fractured is cut.

the advantage of the first is only in terms of cost: fractured and thus creating a unique structure in its kind reduces the cycle time of mechanical processing (work 2 floors less and above all make 2 positions less )
to recognize it just see if there is the classic "sealing" produced by the fracture

the second is used only for motors with very high performance (honestly I do not know if it repeats from the number of rpm or pressure in the room ) and in car production is used on very few models

the biella instead obtained directly in 2 pieces does not make it any more at the level of production in series, is "stupida" under the aspect of the costs because it increases the time of the processing and does not involve any performance benefit. is used only for prototyping with full working.

I hope I've been helpful. Hello everyone
 
"fracture" is a very advanced processing process, which is not a technological step, indeed...
 
el3ctro said:
the second is used only for motors with very high performance (honestly I do not know if it repeats from the number of rpm or pressure in the room ) and in car production is used on very few models
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...and typically for machines operating a certain "commitment" (gas forces preponderant to the forces of inertia and perhaps with symmetric load cycle compared to the origin: "slow" and double-acting machines).
 
fractured biellas were born only for reasons of cost.
you do the same thing (a precise couple) without working plans or reporting positions.
in engines of very high performance are unknown because this technology is possible on high-quality "poco" materials (there is always talk of biella and therefore the quotes are obligatory).
no one dreams of making fractured titanium alloy biellas. ....
greetings
 

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