×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

LEEB Rebound Hardness Testing

LEEB Rebound Hardness Testing

LEEB Rebound Hardness Testing

(OP)
I'm having a very hard time overcoming my extreme initial skepticism about the rebound approach. The whole concept seems totally mickey mouse. (My weapon of choice for field testing has always been Microdur.)

Any experiences (preferably hands on) with this instrument? Limitations in terms of position or sample are required? What situations is it best suited for?

Thanks in advance



"If you don't have time to do the job right the first time, when are you going to find time to repair it?"

RE: LEEB Rebound Hardness Testing

What we found in hardness testing of low alloy steels and welds thereof, was that it gave very poor reults when compared with microdur, tellebrinneler and King Portable Brinnel.

RE: LEEB Rebound Hardness Testing

Ours works fine on the provided test blocks. Preforming the same test on our standard HRc test blocks does not give repeatable results. I have never seen repeatable results on production parts.

Bob

RE: LEEB Rebound Hardness Testing

I think the secret is good surface preparation.

Regards

RE: LEEB Rebound Hardness Testing

r6155,

That is where all methods fall down.
The mag & dye techs who do most of this work are not instructed in techniques of progressive grinding (and a lot else besides).

"Everyone is entitled to their own opinions, but they are not entitled to their own facts."

RE: LEEB Rebound Hardness Testing

I am comfortable using portable brinell or the Poldi test. The reference test bars must be from a standard company, else can get erroneous results.

Rebound hardness testers are accurate on test blocks and not on the casting surfaces .

RE: LEEB Rebound Hardness Testing

The Leeb Rebound Hardness Test (LRHT) invented by Swiss company Proceq SA is one of the four most used methods for testing metal hardness. This portable method is mainly used for testing sufficiently large workpieces (mainly above 1 kg). It measures the coefficient of restitution.

RE: LEEB Rebound Hardness Testing

Our Leeb has worked relatively well for incoming inspection, where we are screening for bad material and we don't required highly accurate results.

That said, it works poorly on light parts and unmachined surfaces. Castings also have innate hardness variation. It is inappropriate for hardness testing of surface-hardened material. These limitations are usually not a problem for us.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login



News


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close