Easy Machining of Hard Materials
Easy Machining of Hard Materials (EMHM) is a laser assisted machining process that can make the
Heating of the surface locally raises the temperature of the glassy ground boundary phase, which is the remainder of the oxide sintering aids used to obtain liquid phase sintering. The system applies sufficient heat to soften the grain-boundary phase and produce the desired ductile deformation to allow machining using a single point cutting tool. This ductile deformation enables reduced cutting forces, high material removal rates, minimal surface damage, and long tool life.
The setup is a practical, industrially rugged production laser assisted machining system.
Ceramics offer unique physical properties. In certain
Due to the various benefits that technical ceramics offer they are used in a wide range of industries and applications. Some of these industries/applications include but are not limited to:
- Cylindrical rollers
- Engine Cam rollers
- Fuel Pump rollers
- Jet engine igniter insulators
- Body armor
- Missile radomes
- Microwave products
- Semiconductor equipment
- Industrial wear applications
- Bearing rolling elements
- Boiler ferrules
- Metal forming rolls
Sand blastnozzle liners
- Aluminum casting products
- Dressing plates for polishing pads
- Thermocouple sheaths
- Welding nozzles
- Welding jigs
- Glow plugs
- Cutting tools
Integration Made Easy
In production environments that currently use diamond grinding to machine ceramics, EMHM will be a comfortable addition to the shop floor. If you are currently using a CNC lathe in your process we can integrate a system with your existing machining center as long as there is adequate cabinet space to contain the unit.
If a CNC lathe is not currently part of your process, we work with our machine center supplier to provide you with a lathe that is a perfect fit for your size operation. In addition to designing a custom system for your
Improved Surface Quality
Testing was performed with samples provided by two leading suppliers of silicon nitride. These samples were tested under five different surface conditions. For ceramic rod B the conditions were: As received, diamond ground (800 grit), laser only, and laser assisted machined. For ceramic rod K the conditions were: As received, diamond ground (100 grit), and laser assisted machined.
These samples were analyzed for surface finish using the advanced digital moire contouring method. A total of 27 images were taking for each of the two ceramic samples. Tests indicate that EMHM provides the best results in terms of surface finish.
While improving surface finish is definitely important, it is the consistency of that finish that leads to a better performing part, especially in applications where reducing friction is key.
Even Stronger Than Before
Testing was performed with samples provided by two leading suppliers of silicon nitride. The samples were tested for flexure strength using a four point bending method. These samples were tested under five different surface conditions. For ceramic rod B the conditions were: As received, diamond ground (800 grit), laser only, and laser assisted machined. For ceramic rod K the conditions were: As received, diamond ground (100 grit), and laser assisted machined. After machining each rod was sectioned into three 19 mm x 50 mm arc segments. The results from flexure testing
For more information about licensing, machining services, or for a quote for a laser assisted ceramic machining center, please contact:
Northern Illinois University
Technology Transfer Office