Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Gluing with the Laser

30.06.2015

Natural stone like marble or granite are processed with saw blades with hard-wearing, diamond cutting segments. When these are damaged or worn, the cutting segments have to be replaced. Usually, the whole saw blade is then sent to a repair shop. 

The Laser Zentrum Hannover e.V. (LZH) and the Institut für Werkzeugforschung und Werkstoffe (IFW) in Remscheid have now developed a mobile, laser-based process chain for gluing the cutting segments onto the saw blade and removing them subsequently without causing damage.


The innovative laser based gluing process could, in the future, replace soldering for refitting saw blades.

Photo: LZH


Concept of the process for laser gluing. (1) Removal of the worn cutting segment, (2) Cleaning of glue residues from the surface, (3) Surface preparation, (4) Hardening of the glue.

Figure: LZH

Up to now, the soldered cutting segments are thermally detached, the soldering partners prepared, and the new cutting segments are then soldered onto the saw blade.

The thermal stress from soldering leads to axial runout deviations (warpage) and an unfavorable distribution of stress in the saw blade. Consequently, the cutting quality decreases, and cutting losses increase. Therefore, additional process steps are necessary to align and preload the saw blades.

Laser for all the process steps

Based on laser and gluing technology, a laser-based process chain for manufacturing glued saw blades was developed at the LZH and IFW. The laser radiation only exerts minimal thermal stress onto the saw blades, so that in the best case, the blades can be refitted without preloading or alignment. Ideally, the saw blade can be refitted as often as necessary.

The laser-based process for the first and consequent fittings of the saw blade consists of four steps: First, the surfaces of the segments and the saw blade are prepared by structuring them using a pulsed laser system. The segments are then glued onto the saw blade using a one-component epoxy resin adhesive, which is thermally hardened using a continuous wave (cw) laser system.

When the life span of the segments has been reached, they are detached from the saw blade using the cw laser system. A pulsed laser system is then used to remove glue residues and impurities from the gluing partners. Following this, the saw blade can be refitted.

Refitting on the spot

For demonstration purposes, the LZH has developed a mobile unit, with which refitting can be carried out directly at the user’s premises. Such a refitted saw blade has already been used to successfully cut granite.

Advantages of Gluing

In comparison to soldering, gluing has many advantages. Among these are a very low, respectively no thermal distortion, no heat tinting, a homogeneous distribution of stress in the joining zone, and a relatively high joining strength and high vibration dampening.

The IGF project under the number 17120 N of the Forschungsvereinigung Forschungsgemeinschaft Werkzeuge und Werkstoffe e.V. (FGW) [Research Association for Tools and Materials] has been funded within the framework of the program for supporting industrial research of the German Federal Ministry for Economic Affairs and Energy (BMWi), based on a decision of the German Parliament.

A short summary of the research results can be downloaded on the website of the FGW Remscheid or the LZH (only available in German).

The final report can be ordered from the Forschungsgemeinschaft Werkzeuge und Werkstoffe e.V., Papenberger Str. 49, 42859 Remscheid.

Weitere Informationen:

http://www.lzh.de/en/publications/pressreleases/2015/gluing-with-the-laser - website of the press release with more pictures, videos and a download link for the summary of the report.

Lena Bennefeld | Laser Zentrum Hannover e.V.

More articles from Process Engineering:

nachricht New manufacturing process for SiC power devices opens market to more competition
14.09.2017 | North Carolina State University

nachricht Quick, Precise, but not Cold
17.05.2017 | Fraunhofer-Institut für Lasertechnik ILT

All articles from Process Engineering >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: The pyrenoid is a carbon-fixing liquid droplet

Plants and algae use the enzyme Rubisco to fix carbon dioxide, removing it from the atmosphere and converting it into biomass. Algae have figured out a way to increase the efficiency of carbon fixation. They gather most of their Rubisco into a ball-shaped microcompartment called the pyrenoid, which they flood with a high local concentration of carbon dioxide. A team of scientists at Princeton University, the Carnegie Institution for Science, Stanford University and the Max Plank Institute of Biochemistry have unravelled the mysteries of how the pyrenoid is assembled. These insights can help to engineer crops that remove more carbon dioxide from the atmosphere while producing more food.

A warming planet

Im Focus: Highly precise wiring in the Cerebral Cortex

Our brains house extremely complex neuronal circuits, whose detailed structures are still largely unknown. This is especially true for the so-called cerebral cortex of mammals, where among other things vision, thoughts or spatial orientation are being computed. Here the rules by which nerve cells are connected to each other are only partly understood. A team of scientists around Moritz Helmstaedter at the Frankfiurt Max Planck Institute for Brain Research and Helene Schmidt (Humboldt University in Berlin) have now discovered a surprisingly precise nerve cell connectivity pattern in the part of the cerebral cortex that is responsible for orienting the individual animal or human in space.

The researchers report online in Nature (Schmidt et al., 2017. Axonal synapse sorting in medial entorhinal cortex, DOI: 10.1038/nature24005) that synapses in...

Im Focus: Tiny lasers from a gallery of whispers

New technique promises tunable laser devices

Whispering gallery mode (WGM) resonators are used to make tiny micro-lasers, sensors, switches, routers and other devices. These tiny structures rely on a...

Im Focus: Ultrafast snapshots of relaxing electrons in solids

Using ultrafast flashes of laser and x-ray radiation, scientists at the Max Planck Institute of Quantum Optics (Garching, Germany) took snapshots of the briefest electron motion inside a solid material to date. The electron motion lasted only 750 billionths of the billionth of a second before it fainted, setting a new record of human capability to capture ultrafast processes inside solids!

When x-rays shine onto solid materials or large molecules, an electron is pushed away from its original place near the nucleus of the atom, leaving a hole...

Im Focus: Quantum Sensors Decipher Magnetic Ordering in a New Semiconducting Material

For the first time, physicists have successfully imaged spiral magnetic ordering in a multiferroic material. These materials are considered highly promising candidates for future data storage media. The researchers were able to prove their findings using unique quantum sensors that were developed at Basel University and that can analyze electromagnetic fields on the nanometer scale. The results – obtained by scientists from the University of Basel’s Department of Physics, the Swiss Nanoscience Institute, the University of Montpellier and several laboratories from University Paris-Saclay – were recently published in the journal Nature.

Multiferroics are materials that simultaneously react to electric and magnetic fields. These two properties are rarely found together, and their combined...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

“Lasers in Composites Symposium” in Aachen – from Science to Application

19.09.2017 | Event News

I-ESA 2018 – Call for Papers

12.09.2017 | Event News

EMBO at Basel Life, a new conference on current and emerging life science research

06.09.2017 | Event News

 
Latest News

Rainbow colors reveal cell history: Uncovering β-cell heterogeneity

22.09.2017 | Life Sciences

Penn first in world to treat patient with new radiation technology

22.09.2017 | Medical Engineering

Calculating quietness

22.09.2017 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>