Cutting and shaping materials with extreme precision is essential in modern manufacturing, especially in industries like aerospace, energy, and electronics.
However, as materials become stronger and harder, traditional machining methods are struggling to keep up.
Now, researchers at The Hong Kong Polytechnic University (PolyU) have developed a new technology that could change how these tough materials are processed.
The research team, led by Professor Sandy To, has created an advanced method called laser-magnetic dual-field assisted diamond cutting.
This approach combines two powerful tools—a laser and a magnetic field—during the cutting process. By using both at the same time, the method achieves better results than using either one alone.
Diamond cutting is already one of the most precise machining techniques available. It uses diamond tools to cut materials at a very fine scale.
However, when dealing with modern high-performance materials, even diamond cutting can cause problems such as rough surfaces, internal damage, and rapid wear of cutting tools.
To address these issues, scientists have explored adding external energy fields during cutting. For example, a laser can heat and soften very hard materials, making them easier to cut. But too much heat can damage the material, creating unwanted melting or tiny craters.
On the other hand, a magnetic field can reduce friction and help control heat, but it does not always work consistently across different materials.
The new PolyU method brings these two approaches together. The laser gently softens the material being cut, while the magnetic field helps control heat and stabilize the cutting process. This combination allows the strengths of both methods to work together while reducing their individual drawbacks.
In tests, the researchers applied this dual-field technique to particularly challenging materials known as high-entropy alloys.
These materials are valued for their strength and stability but are very difficult to machine. The team compared their new method with three others: cutting with a laser only, with a magnetic field only, and without any additional energy fields.
The results were impressive. The new approach produced smoother surfaces and reduced damage beneath the surface of the material. It also minimized scratches that are often caused by hard particles during cutting. At the same time, the method reduced wear on the diamond cutting tools, helping them last longer.
The researchers found that this improvement comes from a complex interaction between heat, magnetic forces, and mechanical cutting. The magnetic field helps spread heat more evenly, preventing overheating from the laser. Meanwhile, the laser makes the material easier to cut, reducing stress on the tool.
Beyond improving manufacturing quality, this technology also helps scientists better understand what happens to materials during cutting. By studying how different energy fields interact, researchers can design even more advanced machining techniques in the future.
Professor To noted that as new materials continue to emerge, traditional single-field methods are no longer enough. This new dual-field approach represents a major step forward in precision manufacturing and could open up new possibilities for producing high-performance components.
The team is currently working to patent the technology and plans to explore combining additional energy fields.
This could lead to even more flexible and powerful machining methods, supporting the next generation of advanced engineering and manufacturing.
Source:KSR .
