Abrasive tool making process – material – or composition – Impregnating or coating an abrasive tool
Patent
1997-01-09
1999-05-11
Jones, Deborah
Abrasive tool making process, material, or composition
Impregnating or coating an abrasive tool
51299, 51293, 428447, B24D11/00
Patent
active
059023600
DESCRIPTION:
BRIEF SUMMARY
This invention is concerned with surface-modifying tools. More specifically, it relates to abrasive tools for modifying the surface of a metal part so as to shape that part or to condition that surface, and it concerns the use of these tools to do these things. It also relates to metal parts thus shaped or conditioned--and in addition it pertains to conditioned-surface metal parts prepared in related but slightly different ways.
In the Specification of our International Patent Application WO 93/24,272 (=GB No: 2,267,242A: P1285) there is described and claimed a method of removing metal from the surface of a metal workpiece by continuously rubbing that surface with a tool in a friction-inducing manner and in the presence of a friction-enhancing agent (an anti-lubricant) in a quantity and in a form such that actual friction enhancement occurs. It is explained how, in the case of surface-shaping rubbing tools such as grinding wheels, some extra workpiece material that is in frictional contact with the tool is sheared from the surface as a result of the increase in kinematic coupling as the friction between tool and workpiece rises, and hence the abrasive tool efficiency is improved.
Operating experience has shown there are many uses for the above-mentioned friction-enhanced shaping of metals, and in particular for those varieties of shaping methods using abrasive media. Furthermore, experience has shown that it is essential that an appropriately thin layer of the friction-enhancer always be available at the surface of the tool, where it makes contact with the workpiece, and is actually carried between the rubbing surfaces as the tool rubs against the workpiece. In the above-mentioned PCT Specification several ways of applying the preferred friction-enhancers, which are siloxanes, are described. In particular, one commercially-attractive method is described involving impregnating and reacting a layer of siloxane onto the vitreous structure within a porous grinding wheel. This system works particularly well when sufficient new wheel surface is created (due principally to re-dressing, or to a lesser extent, to wear) to allow fresh siloxane to reach the surface, as is the case with frequently- or continuously-dressed wheels. However, in some cases the wheel surface lasts longer in the presence of a siloxane, and as a consequence under some operating conditions the supply of siloxane to the surface can after some time become minimal, and in extreme cases inadequate for the purpose of maintaining the sought-after improvement of cutting for the life of the wheel.
Moreover, experience has shown that after prolonged operation under some conditions the siloxane impregnated into the wheel suffers slow degradation near the contact zone around the rim of the wheel. It is thought this is due to the high temperatures near the contact zone, as well perhaps as to the long term exposure of the wheel to the fluids used as the coolant.
The present invention in one of its several related aspects suggests a solution to these two problems; it proposes a novel type of friction-enhancing-agent-carrying abrasive rubbing tool (and its use in a method like that of the aforementioned Specification) in which the friction-enhancing agent is carried by the tool in the form of a composition of an abrasive and a rubbery solid siloxane reaction product admixed with a more liquid, mobile siloxane (that itself has the necessary anti-lubricant, friction-enhancing properties) immobilised--stably dispersed--within the reaction product. For instance, the present invention proposes that the tool be impregnated with a siloxane reaction-product curable fluid that contains within itself a siloxane with friction-enhancing anti-lubricant properties, this fluid being cured within the tool into a rubber-like material that adheres to the structure of the tool and that slowly and evenly releases the anti-lubricant siloxane therein as the tool is used. Ideally, this reaction-product material is evenly distributed throughout the porous tool structure, and in fa
REFERENCES:
patent: 4963432 (1990-10-01), Fugginin et al.
Patent Abstracts of Japan, JP57162768 (Jun. 10, 1982) Abstract.
Ball Burnishing Machine Tools Limited
Jones Deborah
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