US2240302A - Composition for impregnating grinding wheels - Google Patents

Description

Patented Apr. 29 1941 courosrrros roa masomrmo ammo Hugh H. Jones, Birmingham. Ala.

No Drawing. Application September 12, 194., Serial No. 3565 SClaims.

My invention relates to improvements in grinding wheels, and has for an object to adapt them for various uses in grinding aluminum, aluminum alloy, copper and other soft metal bodies which have heretofore tended to fillthe pores of the grinding face of the wheels so quickly as to render impractical their use for abrasive and cut on service.

One object of my invention is to provide a solution for impregnating grinding wheels and a method of using the same which will leave 9. treated wheel with a grinding or cut-oil working face which will not collect and hold the soft metal under treatment, but will keep itself clean and thereby not only maintain its working efilciency, but also avoid the expensive practice heretofore necessary of cutting away with a machine tool its clogged working face to restore its serviceability.

A further object of my invention is to progide a grinding wheel whichshall be self cleaning when employed for cutting or grinding soft metais.

To illustrate the importance of the self cleaning feature of my improved grinding wheels, I have taken the best wheels offered on the market, and when using them on aluminum and the like under service conditions have found that their grinding faces fill with aluminum and cease to grind after from one and one-half to two minutes use. This same wheel when treated in accordance with my present invention has been used for grinding soft aluminum until worn away to the limit of safe use and never, atany time, did its working face become clogged. I have treated with like results rubber bond cute-of! wheels and used them with like successful results on very tough gummy aluminum alloy castings, finding that, as

' contrasted with the-use of a-cut-ofl machine, they gave a 50% saving over band saw blades and a minimum saving in labor cost.

My treatment is unaflected by the character of abrasive grain used or the bond selected for it. so long as it may be. impregnated by the composition, and its objective is attained wherever it can be caused thoroughly to impregnate the abrasive wheel, which term I use as inclusive of any shape or form of an abrasive body.

Briefly, my invention comprises impregnating a grinding wheel with a composition commising from 90% to 97% hydrogenated vegetable oil, such as cotton seed oil, and from 1.75% to 'l.ii% each of a penetrating agent, such as turpentine, sulphonated oil. inated diphenyl, agent, salt, and sulphur.

such as turkey red oil, chloror other equivalent penetrating The following, by way WHEELS of example, sets forth a practical method of prac-.

ticlng the invention.

I place a grinding wheel to be treated in' a vessel equipped with a heating means and containing the following: I

. Parts I by weight Hydrogenated cotton seed oil (Scoco) 320 Salt (sodium chloride) 2.5 to 25 Turpentine 2.5 to 25 Heat is applied slowly and when the solution reaches or approaches the boiling point, I add from 3 to 18 parts by weight of sulphur. The liquid in the vessel is maintained at or near the boiling point for a period of about 3% hours, or

until no more air bubbles are forced out of the wheel, after which it is allowed to cool until solidified. It is important for the reason that the abrasive body absorbs the solution slowly and a relatively long period of time is required to com pletely an the pores of the body.

After cooling, the wheel is removed and cleaned, and after being polished with a soft cloth is ready for The abrasive body when fractured will be foimd with the solution uniformly and completely incorporated therein to such an extent as to fill its void areas from side to side and from hub to periphery; This uniform distribution ofthe solution is important and it is helpful to retain it that theabrasive body to be treated shall be heated along with the solution and enveloped therein so that air is excluded from the abrasive body during the treatment. As the solution heats slowly from V the, bottom up it liquefies and begins to penetrate .drogenated fat elements and therefore I prefer I thepores of the abrasive body from its under side upwardly. and as the body heats it expands and thus facilitates the permeating action of the hot liquid solution, which as it works upwardly through the abrasive body, drives out the air -.ahead of it from the void areasin the body.

Thefunction of the turpentine, chlorinated diphenyl, turkey red oil, or any equivalent element,

is to act as a penetrating agent and cause an even distribution of the mixture throughout the wheel mass. It is especially important in bringing about penetration by the sulphur in the mix. In the case of a 20 pound solution batch, I have used from 0.75% to 7.5%, but as the latter limit is approached there is an objectionable tendency towards a dilution or breaking down of the hythe lower range.

I am of opinion that the salt assists in preventing a glaze setting up on the surface being ground which impairs the wheel's grinding em- 3. An impregnating composition for cutting wheels comprising hydrogenated cotton seed oil ciency. In a 20 pound batch I have used from a wheel is not self cleaning, and where too much.

sulphur is used the oil will not harden in the wheel. I have found it to be an essential of the composition used that the lubricant in the wheel shall be in solid form. Ordinary lubricating oils, I have found, are soon thrown out of the wheel in use and whatever value they might otherwise have is lost.

I wish it to be understood that I do not limit myself to the exact details o1.ingredients and proportions described for obvious modifications and equivalents will occur to a person skilled in the art.

What I claim is:

1. An impregnating composition for butting wheels comprising hydrogenated cotton seed oil 90% to 97%, salt 0.75% to 7.5%, sulphur 0.75% to 7.5%, and a penetrating agent 0.75% to 7.5%.

2. An impregnating composition for cutting wheels comprising hydrogenated cotton seed oil 90% to 97%, salt 0.75% to 7.5%, sulphur 0.75% to 7.5%, and turpentine 0.75% to 7.5%.

90% to 97%, salt 0.75% to 7.5%, sulphur 0.75% to 7.5%, and chlorinated diphenyl 0.75% to 7.5%.

4. An impregnating composition for cutting wheels comprising hydrogenated cotton seed oil 90% to 97%, salt 0.75% to 7.5%, sulphur 0.75% to 7.5%, and turkey red 011 0.75% to 7.5%.

5. A method of improving the cutting property of an abrasive body which comprises immersing the body in a mixture of hydrogenated cotton seed oil 90% to 97%, and salt, sulphur and a penetrating agent each between 0.75% and 7.5%, raising to a temperature near the boiling temperature and maintaining the mix at said temperature for around three and one-half hours.

6. An abrasive body impregnated with a mixture of cotton seed oil 90% to 97%. and salt, sulphur, and a penetrating agent each between 0.75% and 7.5%.

'7. The method of improving the cutting power of an abrasive wheel which comprises impregnating the wheel with a mixture or hydrogenated vegetable oil 91% to 97%, and salt, sulphur and a penetrating agent each around 1%.

- 8. An abrasive wheel impregnated with a mixture comprising substantially the following: hydrogenated cotton seed oil 90% to 97%, salt (sodium chloride) 0.75% to 7.5%, turpentine 0.75% to 7.5%, and sulphur 0.75% to HUGH H. JONES.