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Technical Discussions
Alberto Rivera
Alberto Rivera
00:06 Dec-25-2009
ultrasonic flaw detectors in gears deeth

Hi, everybody........best regards.

Were I can to get information to do ultrasonic flaw detectors in gears deeth, pinion or crown, hipo gears.

Please, could you help us.

thanks a lot and merry christmas.

Ing. Alberto Rivera

    
 
 
S.V.Swamy
Engineering, - Material Testing Inspection & Quality Control
Retired from Nuclear Fuel Complex , India, Joined Feb 2001, 786

S.V.Swamy

Engineering, - Material Testing Inspection & Quality Control
Retired from Nuclear Fuel Complex ,
India,
Joined Feb 2001
786
02:23 Dec-26-2009
Re: ultrasonic flaw detectors in gears deeth
In Reply to Alberto Rivera at 00:06 Dec-25-2009 (Opening).

Dear Alberto,

In my opinion, these are normally not tested ultrasonically, especially since the surface is usually curved. The bar or round from which the gears are machined is tested ultrasonically and the gears are tested using PT and or MT both before and after heat treatment and final grinding.

    
 
 
ezio
Other, Retired ex Laboratory Technical Manager
OMECO Research Centre, Italy, Joined Sep 2008, 273

ezio

Other, Retired ex Laboratory Technical Manager
OMECO Research Centre,
Italy,
Joined Sep 2008
273
12:42 Jan-01-2010
Re: ultrasonic flaw detectors in gears deeth
In Reply to Alberto Rivera at 00:06 Dec-25-2009 (Opening).

Caro Alberto,
Swamy give you a perfect answer, ciao Ezio

    
 
 
S.V.Swamy
Engineering, - Material Testing Inspection & Quality Control
Retired from Nuclear Fuel Complex , India, Joined Feb 2001, 786

S.V.Swamy

Engineering, - Material Testing Inspection & Quality Control
Retired from Nuclear Fuel Complex ,
India,
Joined Feb 2001
786
18:26 Jan-02-2010
Re: ultrasonic flaw detectors in gears deeth
In Reply to ezio at 12:42 Jan-01-2010 .

Dear Ezio,

Many thanks for your kind words.

Regards

Your friend

Swamy

    
 
 
Wieslaw Bicz
Engineering,
PBP Optel sp. z o.o., Poland, Joined Feb 2009, 247

Wieslaw Bicz

Engineering,
PBP Optel sp. z o.o.,
Poland,
Joined Feb 2009
247
11:44 Jan-04-2010
Re: ultrasonic flaw detectors in gears deeth
In Reply to Alberto Rivera at 00:06 Dec-25-2009 (Opening).

I see two possibilities in this case: Very complicated scanner with many axes or ultrasonic tomography. The second possibility seems to be more realistic and simpler.

Such measurement can be important, if it would be possible that flaws can be introduced during machining or other steps of it preparation.

    
 
 
S.V.Swamy
Engineering, - Material Testing Inspection & Quality Control
Retired from Nuclear Fuel Complex , India, Joined Feb 2001, 786

S.V.Swamy

Engineering, - Material Testing Inspection & Quality Control
Retired from Nuclear Fuel Complex ,
India,
Joined Feb 2001
786
02:16 Jan-05-2010
Re: ultrasonic flaw detectors in gears deeth
In Reply to Wieslaw Bicz at 11:44 Jan-04-2010 .

Thanks for an interesting insight.

During machining, residual stresses if any would get relieved leading to redistribution of stresses and cracking may result. Such cracks would normally (most probably) be open to the surface and would thus get detected using PT (preferably Fluorescent Penetrant Test).

Machining could also introduce cuts, scratches, nicks and notches, but they too would be open to the surface and thus visible.

In theory, it is possible to inspect some parts of the teeth using UT or RT, but one should go for optimal solutions keeping the technology of manufacture and the costs in view.

Best wishes.

    
 
 
Wieslaw Bicz
Engineering,
PBP Optel sp. z o.o., Poland, Joined Feb 2009, 247

Wieslaw Bicz

Engineering,
PBP Optel sp. z o.o.,
Poland,
Joined Feb 2009
247
09:33 Jan-05-2010
Re: ultrasonic flaw detectors in gears deeth
In Reply to S.V.Swamy at 02:16 Jan-05-2010 .

This is fully correct. I will only add the comment, that for example ultrasonic tomography device, that would be suitable for such purpose would cost something in the region of 50 thousand Euro (depending naturally on the gear size) - based on the experience with other such devices that we have made up to date. And the cost of work is negligible.

Complicated scanner would cost more, due to the complication and have a problem with measuring time.

    
 
 
Joe Buckley
Consultant, ASNT L-III, Honorary Secretary of BINDT
Level X NDT, BINDT, United Kingdom, Joined Oct 1999, 519

Joe Buckley

Consultant, ASNT L-III, Honorary Secretary of BINDT
Level X NDT, BINDT,
United Kingdom,
Joined Oct 1999
519
12:20 Jan-05-2010
Re: ultrasonic flaw detectors in gears deeth
In Reply to S.V.Swamy at 02:16 Jan-05-2010 .

Depending on the application details it may be worth trying eddy current.

Standard eddy current flaw detectors with a suitable pencil probe can work well for finding cracks, either by scanning along the root of the tooth or from the side. Care is obviously needed to distinguish between crack signals and geometry.

ET has the advantage that it can often be used on assembled gear boxes, assuming it is possible to remove covers and turn gears to gain access.

can be a messy job though...

    
 
 
Aaron greenbank
Aaron greenbank
10:06 Jan-06-2010
Re: ultrasonic flaw detectors in gears deeth
In Reply to Joe Buckley at 12:20 Jan-05-2010 .

Joe is absolutely right that eddy current technology is most likely the best way forward with this type of inspection for gear teeth. Moving one step on from a standard pencil probe, an eddy current array system would offer complete inspection coverage in a single pass with fully recordable results. There are currently only a few companies who can offer this type of inspection as the equipment is rather specialised, however, Innospection (www.innospection.com) does have this specialised equipment and can offer this type of service.

    
 
 
Ingo Becker
Engineering, NDT Inspector & Sales
ec-works GmbH, Germany, Joined Apr 2000, 29

Ingo Becker

Engineering, NDT Inspector & Sales
ec-works GmbH,
Germany,
Joined Apr 2000
29
11:46 Jan-06-2010
Re: ultrasonic flaw detectors in gears deeth
In Reply to Aaron greenbank at 10:06 Jan-06-2010 .

I only can fully agree to Joe and Aaron about the use of eddy current technologies. An additional important aventage is the fact; that in general no cleaning or removing of the grease / oil / or other lubricant is necessary. Compare this with other NDT like PT.....

Please contact me for further detailed information.

Best regards and a successful 2010!

Ingo

    
 
 
Matthew Roy
NDT Inspector, President
Taratech Inspection Services Inc., Canada, Joined Mar 2001, 3

Matthew Roy

NDT Inspector, President
Taratech Inspection Services Inc.,
Canada,
Joined Mar 2001
3
15:05 Feb-03-2010
Re: ultrasonic flaw detectors in gears deeth
In Reply to Alberto Rivera at 00:06 Dec-25-2009 (Opening).

Hello Alberto,

Taratech Inspection Services Inc. inspects mill teeth with eddy current array technology all over the world and we work with the OEM's to help the clients with repairs. Please review our web site www.taratechinspection.com and I look forward to your reply.

Regards,

Matthew Roy Manager
Taratech Inspection Services Inc.
39 Clair Fontaine, Coacagne N.B.
E4R 2H8
Tel 506-576-1993
Fax 506-576-0799
Email taratech@nb.sympatico.ca
Web www.taratechinspection.com

    
 
 

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