US604569A - Strom - Google Patents

Description

(No Model.)

A. V.- RINGSTROM.

GRINDING, ABRADING, OR CUTTING MATERIAL AND MODE 0F PREPARING SAMEL No. 604,569. j Patented May 24,1898.

WITNESSES: INVENTOR ATTORNEY G T VILHELM S M; F OREBRQ, SWEDEN, ASSIGNQR TO S particles of abradin'g material.

UNITED STATES PATE T I Evvm FRYKHOLMf-OF STOOK-HQLM, SWEDEN.

enmnme, Aammme, on CUTTING-MATERIAL Am) MODEOF PREPARING smr.

'srscmcurrox forming part or utters rams no. 604,569, dated m 24, 189 s. 7 Application filed December 26, 1895. Serial No. 573,898- (10 model.) d

To all whom may concern;

, Be it known thatI, A GUSTVILHELMRING strnom, a subject of the King of Sweden and Norway, and a resident of 34 Storgatan;0rebro, in the Kingdom of Sweden, have invented certain new and useful Improvements in Grinding,Abrading, or Cutting Materials and in the Mode of Preparing the Same, of which the following is a specification.

This invention relates to the class of compositionsfor grinding, abrading, cutting, or polishing wherein the abrading material in bits or pieces is united in a mass of the proper form by means of metal used asa binding agent. mode has been applied only in-making mi1l-' stones, where relatively large bits orpieces of emery have been united or joined in a mass by simply pouring over or among them metal-as zinc,for example-which has a comparatively low melting-point My invention does not employ the abrading material in coarse bitsorpieces, but in fine particles, like sand, and it has been found impracticable with a mass of such fine material to unite all of the particles to each other with. molten metal by simply mixing the latter with the To overcome this difiiculty and to provide a cutting or abrading surface on the article or tool is the object of the present invention, which con-.

, sists, essentially, in first coating each particle or grain of the abrading material with metal,

then mixing the coated particles with molten metal or metallic alloy, and then casting the mass to give it the proper form.,

- In carrying out the invention I take fine particles of the abradin'gmaterialsuch as diamond-dust, corundum, carborundum, emery, &c.and give to each particle or granule of such material a metallic coating. This coating may be applied in several ways. For example, the abrading material may be placed in a suitable solution of a metallic salt, to

which a reducing agent is added-for instance, a solution of oxid of silver in ammonia, to which is added a reducing agent, as

grape-sugar, tartaric acid, &c. -or a coating of metal may be applied mechanically-for example, by first coating the particles or granules of the abrading material with some Heretofore, so far as I am aware, this refractory adhesive substance (as waterglass, so .called) and then coating the particles fwith powdered metal or metal-dust, which latter is causedto adhere to the particles 'by the water-glass. This may be effected by putting the particles of abrading material in a mixing-drum with a suflicient quantity of the water-glass to cover them, then adding to the mass a suflicient quantity of the metal-d ust, and then shaking or agitating the mass until the particles are all thoroughly coated. The metallic coating, however applied, will be a mere film, very thin; but it will have suflicient strength to answer the purposes intended if the metal used for binding or connecting the particles in forming the tool orarticle has a lower melting-point than the coating metal and does not readily alloy with the latter. Otherwise the coating or film of metal on the particles must be strengthened by applying a thicker coating, according to the well known electroplating process or by electroplatingalone, in which case the particles or granules of abrading material will be first coated with graphite, manganese per: oxid, &c., in lieu of metallic dust. This electroplating may be conveniently-effected by first coveringthe particles of abrading material with a conducting coating or film, as explained, and then immersing them in a suitable metallic-salt bath-f0r instance, an alkaline copper-salt bath-wherein they are allowed to come in contact with the electropositive metal, as zinc. This will give them a coating of copper. The coated particles are now mixed with the molten metal or alloy,

which is to embed them and bind them together. Such metal or alloy may consist of a suitable metal and sulfur, phosphorus, carbon, silicon, or other metalloid. As regards the form of the abrading tool or article, the composition may be cast into the form of disks of diiferent sizes and shapes or be cast on the surfaces of wires or ropes, such as endless.

ropes for use in cutting stone, &c. .It can also be cast on cloth and on the edges of thin metal plates to be used as saw-blades. After the compound has been cast the points or cut- A this may be done away the metal with a Meawmh water or oil, but prefdisso1ving the metal away with I flgzcorrosive chemicals; or if the bind- ;Z7etal be an electropositive one, as zinc, 1 1, 5 denudation of the particles may be-af- ,cted by galvanism in awell-known manner. The tool may be sharpened from time to time by this same mode of denudation of the angles or edges of the particles of cutting or abrading material.

In the accompanying drawings, which illustrate the invention, Figure 1 is an enlarged 15 or magnified fragmentary view of a part of a tool constructed according to my invention; and Fig. 2 is a view on a similar scale, showing some of the metal-coated particles or granules before being bound together by the embedding metal.

In the views, a represents the coated granules of abrading material, and b the binding or imbedding metal.

Having thus described my invention, I claim-- molten metal, and then'shaping said mixture into suitable forms for use.

2. As an improved article of manufacture, an abrading or cutting tool having its surface composed of a mass of fine particles or granules of hard abrading material, each coated with a film or metal, and an embedding or binding metal about and among said granules, the binding metal having a lower melting-point than that of the metal with which the granules are coated, substantially as set forth.

In witness whereof I have hereunto signed my name in the presence of two subscribing witnesses.

AUGUST VllillELM RlNGSTRiiM.

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