CORDIS provides links to public deliverables and publications of HORIZON projects.
Links to deliverables and publications from FP7 projects, as well as links to some specific result types such as dataset and software, are dynamically retrieved from OpenAIRE .
Exploitable results
Point crushing is a new, highly innovative dressing technology for vitrified bonded diamond grinding wheels that are used for hard metal grinding. Recommendations for the choice of dressing parameters for point crushing, result directly from the investigations on dressing and on the wear behaviour of the vitrified bonded grinding wheels as a function of the dressing parameters. These results are specific for the point crushing technology and will mainly be used by the producer of the technology. Furthermore, it will allow the end user of the technology an optimum use of the developed point crushing dressing and, consequenty, a full utilization of its technological and economical potentials.
Especially for grinding of cones, turning of the grinding wheel axis and the work-piece axis to each other can be advantageous for the work-piece quality and the economy of the production process. Concerning the experimental grinding machine, a concept has been worked out that assess different possibilities for the positioning of a B-axis for swivelling one of the components. The study does not give details for the solution, but a survey of problems and advantages and is an impulse for machine tool producers who are concerned with cone production.
During the research work carried out, it has been verified that force measuring sensors and acoustic emission sensors are useful equipment, not only for the assessment of the dressing and grinding processes, but also for monitoring. During the crushing process, a monitoring system for the first contact and the detection of the full contact width is necessary for a save and fast dressing process.
The basis of the machine tool demonstrator is the external cylindrical grinding machine; Overbeck R 600 CNC HSG. The crushing device for dressing is mounted on a high frequency spindle and situated on the traverse feed table. This unit enables a CNC profiling of grinding wheels and decreases the crushing roller wear by decreasing the slip between the roller and the grinding wheel. The grinding wheel position is measured by an air nozzle. By this, the wheel wear after grinding and the dressing amount can be compensated and the exact work-piece geometry can be machined.
The whole technology is transferable to other grinding machine types and to other grinding wheels like vitrified bonded CBN wheels for steel grinding. The high frequency spindle unit and the measuring nozzles raise the price of the grinding equipment, but the process stability is distinctly improved. Thereby technological and long-term economical benefits are given.
The tested technology helps to implement the vitrified bonded diamond grinding wheels for the application in hard metal grinding. This crushable grinding wheel generation stands out in that it can be addressed to complex shapes. There is a high market demand for these wheels. The grinding machine device helps to realise an economic hard metal grinding process when narrow tolerances and complex work-piece geometry is demanded.
In the hard metal sector, grinding with resin bonded grinding wheels is a predominant feature. The application of vitrified bonded grinding wheels is an innovative result of the demand for easily dressable wheels in this sector. On vitrified bonded grinding wheels, even complex shapes can be produced by this point crushing technology. For these vitrified bonded grinding wheels, high speed grinding leads to a distinct improvement of work-piece roughness and wheel wear. This has not been observed for resin bonded wheels which are conventionally used. The investigation results, researched for vitrified bonded wheels and for the high speed grinding technology, are developed for external cylindrical grinding, but they can be transferred to other grinding processes. Therefore the grinding technology has a high application potential in the wide field of hard metal grinding.
In a simple screening test the cobalt uptake has been measured for oils containing different coolant additives. The result is a list with a classification of the fluids and additives regarding a good or a poor compatibility with cobalt. For the first time a comprehensive summary of the influences of fluids and additives on the insalubrious cobalt leaching is available.
This study helps to compose new coolants for hard metal grinding. Not only neat oil products can be developed, but the study also helps to improve ester products that are much more ecologically beneficial.Due to increasing ecological, legal pressure, the avoidance of cobalt leaching becomes more and more necessary for coolant producers and users, even from economic aspects.
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