To date, grinding, according to the German DIN Standard 8580, is”machining with geometrically undefined cutting edges” while othermachining processes such as turning and milling are classified asprocesses with “geometrically defined cutting edges”. New abrasivegrains, called PSG and developed by 3M, stand this definition onits head. For the first time, grinding wheels made with PSG, calledCubitronTM II, can claim to be made up of “geometrically definedcutting edges” as each and every grain is exactly the sameengineered shape. Hence, it might be more appropriate to talk about”micro-milling” rather than grinding. This is borne out by lookingat the resulting “flowing” chips which are akin to chips seen inmilling operations, just finer.
These free-flowing chips no longer clog up the grinding wheeland, therefore, the grinding wheel remains free-cutting anddressing becomes only necessary due to loss of from rather thanloss of cutting ability. In repeated tests, this has shown todrastically reduce the risk of burning and to give consistent andpredictable results. Furthermore, tests and subsequent long termtrials under production conditions have shown that grinding timecan be cut in most cases by at least 50% in comparison to grindingwheels made of standard ceramic abrasives.
Based on more than 100 carefully monitored and documented geargrinding trials, this paper will demonstrate how CubitronTM IIgrinding wheels work both in continuous generating grinding of carand truck gears, and in form grinding of large diameter gears forwind generators, for example. Furthermore, the paper will discusschip formation, filmed with high resolution slow motion; and thebenefits of the freeflowing chips in terms of resulting consistentsurface finish, superior form holding and extended dressingcycles.
- Edition:
- 13
- Published:
- 09/01/2013
- Number of Pages:
- 10
- File Size:
- 1 file , 640 KB
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