tips on rectification without centers, tools and other

[Poulexcook]

hello to everyone, it's my first message and I hope it doesn't fall into the void...
I find myself having to work on a rectification without centers, a wild mouth.. with which I have some problems on the surface of the processed pieces. . defects that I think come from a mal regulation of the various parameters that rectification, countermoil degrees etc...

Can you help me?
also recommending me some text on which I can have notions on tooling. . processing speed etc..

Thank you!

 

[meccanicamg]

contact the grinding manufacturer and ask him. Best thing.
Alternatively, you can ask some university technologist if he gives you a hand to pull together the whole set.

 

[Poulexcook]

Thank you, it would be the most obvious thing. to rely on a competent figure. The problem is that it's not a decision I make... and therefore I try to solve by arrangement .. someone who maybe works with the same type of rectification I will find it right?? . I hope. .

 

[IronMike87]

we say that put down so the question remains excessively vague.

What kind of problems do you encounter: Too high roughness? burns? Cracks? Unrespected dimensional tolerances?
What material are you working on? Have you done previous work in the company? has undergone thermal treatments (internally/externally)? If yes, have they been certified as compliant?

talking about the actual workmanship: how many diamonds? Do you use whole oil or emulsion? have you changed type/supplier of the moles?

in the company we do not work with that kind of adjustments, but I can assure you that the information you gave is really too little.

 

[Poulexcook]

Hello ironmike, thank you for your interest.
Specifically, the problem is a fairly light but visible burn. with cadence every round of countermoil. .
in company we rectify various types of steel.. using the same pile. emulsified oil, and necessary diamonds.. almost always to make finishes with roughness <ra0.8

 

[antonio_sc]

I hope it can help you. .
a change of color does not necessarily indicate the presence of other thermal damage (it could have simply oxidized)..in this case apart from the "cosmetic" aspect there are no real metallurgical damage. .the speech should be deepened with an expert (as you have already been suggested)

 

[IronMike87]

Hello ironmike, thank you for your interest.
Specifically, the problem is a fairly light but visible burn. with cadence every round of countermoil. .
in company we rectify various types of steel.. using the same pile. emulsified oil, and necessary diamonds.. almost always to make finishes with roughness <ra0.8

to make sure that the burn is not only aesthetic, but has attacked in depth (oxidation, tempering or even new tempering) I think it is necessary to do a control with acid attack.
but I don't know if you have a chance to do.

if however the parameters and oil are the same "historical" of past productions, the cases are reduced:
- has never given weight to this problem so far, although it has always been cyclically re-presented (for direct experience I would not exclude this case)
- material with chemical compositions altered respect / non-conform thermal treatments: things can go hand in hand, but not necessarily. First, I would verify that those who supply this material did not change treatment, or that the chemical composition of the material used is in line with past productions. by experience, with the current shortage of steel availability I have seen so many take materials available on the market but not really comparable, and treat them as if they were .... with results I would avoid commenting.
- defectiveness of the mola... remote hypothesis but not to be discarded.

in general if the problem is the burns, I would decrease the progress, I would try to improve the lubrication (if possible) and increase the frequency of damping

I hope it can help you. .
View attachment 51513a change of color does not necessarily indicate the presence of other thermal damage (it could have simply oxidized)..in this case apart from the "cosmetic" aspect there are no real metallurgical damage. .the speech should be deepened with an expert (as you have already been suggested)

interesting this scheme. What text did you get?

 

[antonio_sc]

no text...material available online http://mzf.it/wp-content/uploads/2015/01/rettifica_asp.pdf