Patent Application
20050225012
The present invention relates to a method of producing abrasive tools and to an abrasive tool produced by the method.
More particularly, the present invention relates to a method of producing abrasive tools and to an abrasive tool produced by the method in which particles of abrasive are composed of aluminum oxide.
Methods of producing abrasive tools of this type are known in the art. In accordance with a known method, an initial material including several components, and aluminum oxide abrasive power is processed by rolling in rolls to obtain a sheet, and thereafter the corresponding tools are made from the sheet, for example by punching with subsequent thermal treatment. The disadvantage of this solution is that generally the rolls are formed of metal, and during rolling of the sheet, the hard particles of aluminum oxide cut the surfaces of the rolls and therefore significantly wear them.
It is an object of the present invention to provide a new method of producing abrasive tools and to an abrasive tool produced by the method which eliminate the disadvantages of the prior art.
In keeping with these objects and with others which will become apparent hereinafter, one feature of the present invention resides, briefly stated in a method of producing abrasive tools with abrasive particles composed of aluminum oxide, comprising the steps of producing a mixture including particles composed of Al(OH)3, forming blanks of abrasive tools from the mixture; and subsequently subjecting the blanks to a heat treatment so that the particles of Al(OH)3 are converted into particles of Al2O3.
When the method is performed and an abrasive tool is made in accordance with the present invention, the particles which together with other components of an initial mixture are subjected to rolling in rolls are not aluminum oxide particles which are very hard but instead are particles of Al(OH)3, so that the rolls are no longer subjected to excessive wear as in the prior art. During the subsequent thermal treatment Al(OH)3 particles are converted into Al2O3 particles thus forming the final abrasive particles.
The novel features which are considered as characteristic for the present invention are set forth in particular in the appended claims. The invention itself, however, both as to its construction and its method of operation, together with additional objects and advantages thereof, will be best understood from the following description of specific embodiments when read in connection with the accompanying drawings.
In accordance with the present invention abrasive tools with abrasive particles composed of aluminum oxide are produced in the following manner.
First of an initial material including mixture of several components is provided. The mixture can include for example a base of butadiene nytril rubber, a curing agent sulfur, a softener dibytilphtalate, polyvinyl chloride, hardener, phenolic resin, and a powder composed of particles of Al(OH)3.
The thusly produced mixture which is identified with reference numeral 1 is rolled between rolls 2 and 3 so as to form a sheet 4 composed for example of the above-mentioned components and the particles of Al(OH)3 as shown in
After the sheet 4 is produced, it is supplied to a next working position shown in
The punched out blanks of working elements or tools, which can be disc-shaped or can have a different shape, are then supplied for a thermal treatment, for example in a mold 6 as shown in
It will be understood that each of the elements described above, or two or more together, may also find a useful application in other types of constructions differing from the types described above.
While the invention has been illustrated and described as embodied in a method of producing abrasive tools, it is not intended to be limited to the details shown, since various modifications and structural changes may be made without departing in any way from the spirit of the present invention.
Without further analysis, the foregoing will so fully reveal the gist of the present invention that others can, by applying current knowledge, readily adapt it for various applications without omitting features that, from the standpoint of prior art, fairly constitute essential characteristics of the generic or specific aspects of this invention.
