US1751340A - Method of producing steel abrasive material - Google Patents

Description

March 18, 1930. s. D. LAYTON' METHOD OF PRODUCING STEEL ABRASIVE MATERIAL Filed NOV. 1927 gnmwtoz 61am nu;

Patented Mar. 18, 1930 "UNITED STA P AT )smunr. in. narrow, or GALION, onro METHOD OF PRODUCING STEEL ABRASIVE MATERIAL Application filed November 4, 1927. Serial No. 231,141.

This invention relates to improvementsin the production of carbonaceous metal.abra-' sive material, the invention residing primarily in a method for the production of an ,5 abrasive matter from the so-called metal shot or similar stuff by passing the same' between relatively adjusted rigidly supported rolls and thereby subjecting the matter to a. crusher suflicient to reduce it to granular form, the

granules of which will be of a more uniform size, yet relatively difierent shapes and cutting edges, affording the finished material with abrasive qualities capable of peak efficiency when directed on to an object to be treated thereby.

'Another equally important object of the invention resides in the provision of a method for the production of a carbonaceous metal abrasive wherein a materially less number of difierently sized abrasive granules will be produced, avoiding wastage and incident loss, the product being free from powder like particles and consequently, without graphite which, with usage of an abrasive containing the same will cause the objectionable smudging of objects treated therewith. Other objects of the invention will be quite obvious'and in part pointed out hereinafter.

That the meritorious features of the im- 80 proved method hereinafter set forth in detail may be understood and appreciated by workers skilled in the art, it may be noted at this.

\,point that the methods heretofore practiced in the production of carbonaceous metal abrasive materials, generally, are objectionable and' comparatively impracticalin that through the same, a material consisting of too varied range of sizin is had, such material including granules o excessive size at the character at the other. Because of this'wide variance of sizes or mesh of the materiaha goodly portion thereof represents absolute waste and loss following a classifying sizing of the same through separator apparatus. Further, by reason of the-manner in which the shot or raw material is crushed, the graphite products of the metal are liberated and this, with a continued working of the me hod, causes the coating of the material to one extreme and particles of powder like such an extent that the cutting edges of the granules or particles are rounded and dulled and when it is subsequently used an impractical cleaning results; also, with usage an extremely objectionable smudging of the article treated results, therefore rendering the material practically unfit for usage in thecleaning of porcelain matter and the like. The abrasive material produced by my improved method, as hereinbefore stated, contains but a limited number of di'lferently sized granules and practically all of these-granules may be classified or sized through suitable separator apparatus and subsequently used for different work; the particles or granules being free. of graphite coating and consequently, possessing sharp or acute cutting edges capable of highly eflicient abrasive action and further, the material is free of, liberated graphite so that articles treated thereby will 1 .not be smudged or soiled.

, In order that the invention .and its mode of working "may be fully understood by those skilled in the art, I have in the accompanying illustrative drawings and in the detailed following description based thereupon, set out a possible embodiment of the invention.

In the drawings: j Figure 1 is a vertical transverse section through a form of mill employed for the crushin of the abrasive material in accordance wit the invention,

Figure 2 is agreatly enlarged elevation of the shot or raw material, from which I produce my imp roved abrasive, and- Figure 3 1s a'similar View showing particles or granulesof abrasive material produced in accordance method.

drawings, in connection'with which like characters of reference will designate corresponding I parts throughout, my improved method for the production of a carbonaceous metal abrasive material is effected or worked 95 4 through the medium of a roll type of crushing mill such as is generally illustrated in Figure 1 of the accompanying drawings, said mill includinga base or body portion 1 on which bearings 2 are adj ustably mounted and 0 .with the impr dw Having more particular reference to the carry relatively opposed parallel crushing rollsv 3 adapted to be rotated at substantially the same rate of speed; the bearings 2 being adapted to be relatively adjusted through the medium of adjusting rods 4 having adjusting and locking nuts 5-turned into engagement with the screw threaded ends thereof. By

- this means, the adjacent peripheral portions j in Figure 2,. when introduced to and'passed of the crushing rolls 3 may be minutely adjusted to such relative arrangement that the so-called meta-l shot or raw material designated by the numeral 6 and shown in detail into the pre-adjusted gap between the curved crushing surfaces of the same, as shown in the Figure 1, will bereduced or' crushed to produce abrasive granules of a generally uniform or near uniformsizing designated by the numerals 7 and shown in detail in the Figure 3.

It is of course to be uhderstoodthat an appropriate form of means for feeding or delivering the raw material or metal shot through the relatively opposed peripheral portionsof the crushing rolls, may be provided, such as conditions or preference may dictate and likewise, that a suitable form of means may be provided the mill forreceiving the crushed abrasive material 7 and conveying it'to a suitable delivery point. Likewise, if desirable, the specific form of crushing rolls and mounting therefor together with the mechanical means for effecting relative adjustment of the same may be changed or modified within the range of mechanical multiplicity of cutting faces or edges which will remain clean, sharp and acute and hence, will lend materially to the abrasive efliciency of the product.= Furthermore, it will be understood that the abrasive material produced in accordance with the improved method will be free of graphite coating over or about the abrasive granules and consequently upon this, their cutting edges or faces of the. granules will remain sharp and clean an therefore will effectively clean matter treated thereby without liability of smudgingor similarly soiling it due to the coating of the granules by graphite liberated during the crushing operation as is the case with those forms of abrasive materials produced by method heretofore prevalent in-this particu-' la: art.

The crushed carbonaceous metal abrasive subsequently to discharge fromthe millwill, of course, be subjected to a classifying stage of operation, not shown herein, whereby the differently sized granules will be classified 7 according to their respective sizes 'and then packaged or bagged for subsequent usage in accordance with the requirements of a particular job;

- As stated elsewhere in this specification,

I am quite fully aware that carbonaceous metal. abrasive materials have been long produced in, this particular art but in so far as my knowledge extends, the art has heretofore been without a method of producing a carbonaceous metal abrasive material wherein a limited number of differently sized abrasive granules will be produced and wherein the presence of powder like particles in the material will be greatly reduced and furthermore, the abrasive granules or particles will be free of a coating of graphite liberated during the crushing operation.

Through the medium of my method, an abrasive material possessing each of the aforesaid desirable qualities is had.

I claim:

1. The herein described method of producing a carbonaceous metal abrasive material, which consists in introducing the raw material in form of shot into the gap between relatively opposed crushing surfaces movingat substantially the same rate of speed through said gap and subjecting the material to the crushing action thereof.

2. The herein described method of producing a carbonaceous metal abrasive material which consists in introducing the-raw material in form of shot into the preadjusted gap between relatively opposed crushing surfaces moving at substantially the same rate of speed through said gap and subjecting the material to the crushing action thereof.

3. The herein described method of producing a carbonaceoils metal abrasive material, which consists in introducing the raw .materialin form of shot into the gap between the curved surfaces of relatively op- J posed crushing devices movlng at substantially the same rateof speed through sald gap and subjecting the material to the crushing action thereof;

4 4;. The herein described method of producing a carbonaceous metal abrasive material,

which consists in introducing the raw material in form of shot into the preadjusted gap between relatively opposed curved crushing surfaces moving at substantially the same rate of speed through said gap and subjecting the material to the crushing action thereof.

5. The herein described method of producing a carbonaceous metal abrasive ma terial, which consists in introducing the raw material in form of shot into the gap between relatively opposed crushing surfaces meteec material in form of shot into the gap between relatively opposed crushing rolls -moving at substantially the 'same rate of speed through said gap and subjecting the material to the crushing action thereof.

SAMUEL D.

'LAYTON.

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