Please help, same metal samples from two sources machine differently
Hi all
I need your help, I've got two suppliers of Naval brass, the materials are the same from each supplier and a chemical analysis has confirmed this, a hardness test has also been completed with no major differences between the two samples found. The problem is that both of them machine completely different. One of them is perfect and machines easily, yet the other is very difficult and breaks a lot of tools.
The suppliers can't understand why this could happen, so I was wondering if anyone here might have any ideas as to how two materials supposedly the same can act differently on a machine?
Rich
I need your help, I've got two suppliers of Naval brass, the materials are the same from each supplier and a chemical analysis has confirmed this, a hardness test has also been completed with no major differences between the two samples found. The problem is that both of them machine completely different. One of them is perfect and machines easily, yet the other is very difficult and breaks a lot of tools.
The suppliers can't understand why this could happen, so I was wondering if anyone here might have any ideas as to how two materials supposedly the same can act differently on a machine?
Rich
Replies
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Ramani Aswath
Normal chemical analysis does not tell the whole story. Small additives, which are clubbed under 'other metals' can drastically alter machinability. Grain structure can vary depending on the metallurgical history of the stock material. This also modifies machining behaviour. Finer grain usually machines better. Sometimes proprietary additives are used to improve certain characteristics like machining. These are in quite small amounts and can be missed in normal chemical analysis.Richard O'ConnorI' t two suppliers of Naval brass, the materials are the same from each supplier and a chemical analysis has confirmed this. One of them is perfect and machines easily, yet the other is very difficult and breaks a lot of tools. Rich
Have you conducted any spectrometric evaluation? If so, do both alloys show the same spectrum? -
Richard O'ConnorThank you for your fast response and for the explanation, I've passed the message on to the people who are working on this with me and hopefully it will allow us to move forward.
Thanks again for the help 😀
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