heat treatment process

[AndretheGiant]

Hello everyone

I would like to better understand how the process of thermal treatments entrusted to third parties works: If for example I send a dozen trees to tempt the treatmentist will put them together in an oven together with other pieces? can manage also requests of different hardnesses or the furnace must be selected for identical final hardness?

Is the straightening phase a bit cloudy? the treatmentist at the end of treatment takes the pieces and “raddrize” them in press according to what requirements? should be done only with long pieces or also for more homogeneous geometries? Sorry ignorance, but in the company it rarely happens to use hardened pieces and it is simply said that it is tempered, but beyond the technical/theoretical requirements I would like to better understand the real management of these treatments

 

[PIETRO2002]

according to the type of steel, and according to the type of piece the treatmentist will arrange them in the oven according to its experience, capacity of the oven etc. etc.
you on the design you will have to put the hardness you want to get, the treatment of only tempering you never do yourself but is followed by a tempering in order not to have a fragile piece and to get the desired hardness. if you look at the sheets of the individual steels, they also give the curves of tempering, hardness obtained according to the temperature.

normally the treatmentist does not straighten the pieces, not all the pieces you have to straighten, if you have a platelet almost never, you have a long tree, surely you have to do it. . Therefore it depends on the type of piece, in the working cycle often you have to leave of overmetal, then generally to remove grinding after treatment, in order to obtain the required tolerances.

 

[batleo]

Hi.
I would add that you must have an idea of what you want to get and what work you have to do the piece, I explain, the straightening usually required it for the distension of the fibers to avoid internal cracks, (what happened ) , and then from experience always with the same thief I held the nominal ø +0.8mm so that I have margin to bring the tree to tolerance after treatment.
if you are interested in the website tecniche - lucefin there are the technical cards of the materials made very well and so you know what you can get

 

[AndretheGiant]

thanks for the answers. So the possible straightening does then who does the grinding process?
I couldn't even understand the difference with cementing. . when using either one or the other and if the cementing pieces start already from reclaimed or start also from the untreated steel

 

[PIETRO2002]

any straightening can be done by anyone provided with appropriate equipment and experience before rectification.

cementing is made on steels with a carbon percentage of up to 0.2 %, the treatment enriches the surface of the piece and follows tempering treatment and distension. you will have a piece with a hard surface and a tough core.

the tempering is carried out on steels with carbon percentages greater than 0.30 %, then the treatment of tempering and tempering.
Depending on the hardness of steel, you will have a treatment that will come deep into the piece.
of course also count the possible alloy components, piece size, treatment data.

It's a fairly complex field, I would recommend you read a good book of metallurgy and/or get a little information on the net.

 

[TETRASTORE]

So the possible straightening does then who does the grinding process?
I couldn't even understand the difference with cementing. . when using either one or the other and if the cementing pieces start already from reclaimed or start also from the untreated steel

qui find the explanation of thermal treatments while to facilitate the understanding of which types of steels and for what types of application you can see: cementing steels e acciai da bonifica.
the most advanced treatments provide you with the specifications, like this., which you must provide to carry out a treatment that gives expected results; If you want straightening, you must specify it.
with regard to straightening you can have more information from previous discussion and I also attach an example of design provided to the treatmentist for straightening screws of endless screw reducers (of course the deviations vary depending on the size of the tree).

 

[AndretheGiant]

wow how many info. Thank you so much!