Detection

Grinding burn detection

Grinding burn or thermal damage is a common cause of machine or engine component failure. If this heat is not quickly detected and removed by a suitable cooling process, it can have an adverse effect on the service life of the product. For the assessment and optimization of your grinding processes, we offer Barkhausen Noise Analysis, Prism and X-ray Diffraction.

Want to know more about how to prevent, detect and solve grinding burn?

Technology
Stresstech has been providing nondestructive and destructive testing solutions for process control and quality inspection. Stresstech’s measurement testing solutions include Barkhausen noise analysis, X-ray diffraction and ESPI hole drilling (electronic speckle pattern interferometry).

Application
Practical applications of Barkhausen and X-ray diffraction are;

  • Evaluation of residual stresses
  • Evaluation of hardness
  • Grinding burn
  • Testing surface defects

X-ray diffraction (XRD)

X-rays were discovered by German Physicist W.C. Röntgen in 1895. X-rays are a type of electromagnetic radiation with a much shorter wavelength than visible light, and are therefore more energetic. By exploiting the higher energy of these “soft” x-rays, we can probe the inter-atomic distance in crystalline materials at a depth of 1 to 5 microns below the surface.

By assuming a planar stress distribution and using the inter-atomic spacing as the ultimate reference length, we can measure absolute stress without needing unstressed samples for calibration.

X-ray diffraction

Barkhausen Noise Analysis

We use Barkhausen Noise Analysis for grinding burn and heat treatment defect testing. During residual stress measurement, the sensor picks up the Barkhausen noise signal and transfers it to the Rollscan signal analyzer. Rollscan is the power source and digital signal processor. ViewScan or MicroScan are the software for real time data acquisition and reporting.

Component handling systems are custom made equipment for moving and rotating the component and/or sensor (one or more) on the surface to be measured.

X-ray diffraction

Prism

Prism is an advanced hole-drilling system that dramatically improves the ability to make quick and accurate residual stress measurements.

As with conventional strain gauge hole-drilling systems, the instrument measures changes in the part surface caused by the hole drilling to determine the previously existing residual stress. However, this method avoids the often time-consuming use of strain gauges, and it also analyses a large area around the hole. Only minimal sample preparation is required.

The Prism system measures surface distortion optically using laser light that is diffusely reflected from the sample surface, in a technique known as electronic speckle pattern interferometry, or ESPI. The Prism software manages the measurement, collects the data and analyses the results and data quality.

stresstech Prism
stresstech

“We have introduced workshops at the NPS under the direction of Jos van Langh. He is a real authority in the domain of grinding and founder of the company Innogrind.”

Frank StegginkBranche Manager NPS at Metaalunie

Besides detecting grinding burn, we also help our customers in the next step by solving this with our coolant solutions and training employees to prevent grinding burn in the future.

Would you like to schedule an on premise detection with high-end techniques and receive an advisory report on where and how to reduce or prevent thermal damage?