Product category:
Non Destructive Testing
News Release from: Indentec Hardness Testing Machines | Subject: Turbine hub hardness checks
Edited by the Manufacturingtalk Editorial
Team on 22 November 2002
Large hub hardness checked without
manhandling
A special system enables the hardnesses of large, heavy turbine hubs to be determined quickly and repeatedly with minimal manual handling.
A special system from Indentec enables the hardnesses of large, heavy turbine hubs to be determined quickly and repeatedly with minimal manual handling Designed for hubs upto 1000mm in diameter and weighing 30kg and more, the system consists of a dual scale digital tester fitted with a Y frame table that can be adjusted to give stable three point support to each hub during testing
This article was originally published on Manufacturingtalk on 10 Jul 2002 at 8.00am (UK)
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Brinell tests are made on the hub at points near the firtree fixings for the turbine blades.
When the point has been selected, the system positively locates the hub beneath the nose mounted indenter.
After the test, the indenter is retracted so that the image of the impression can be transmitted by a fixed high resolution camera to a monitor, where the diameter is measured to establish the hardness.
The reading is then downloaded to a printer along with related data.
The system uses Brinell testing with a 1mm diameter ball and 30 kgf test load because the process minimizes the risk of significant stress points close to the firtree fixings.
However, it can also be employed for Vickers testing using a diamond indenter and registering the impression on the same monitor.
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