US2457516A - Method of making abrasive cutoff wheels - Google Patents

Description

Dec, 28, 1948. H. v. ALLISON 2,457,516

METHOD OF MAKING ABRAS IVE CUTOFF WHEELS Filed May 10, 1947 ATTORNEY Patented Dec. 28,. 1948 METHOD OF G ABRASIVE C UTOFF WHEELS Hugh V. Allison, Fairfield Allison Company, Brid tion of Connecticut geport, Gonn a corpora- ConhQ, 'a'ssignor to The Application May 10, 1947, Serial No. 747,291

1 This invention relates to new and useful improvements in abrasive cut-oil wheels and methods of makingthesame.

An-object of the invention is to provide a method whereby large diameter abrasive cut-ofi wheels may be made without the necessity of employing large and expensive equipment.

Another object is to provide a simple and inexpensive method of making animproved construction of abrasive cut-ofi wheel including a feature whereby the wheel will carry large quantities of a coolant into a out being made.

A further object is to provide an improved construction of abrasive cut-off wheel including a feature ofconstruction whereby the wheel when in use will carry large quantities of a coolant into acut being made.

Other objects and advantages of the invention will become apparent from a consideration of the following detailed description taken in connection with the accompanying drawing wherein a satisfactory embodiment of the invention is shown. However, it is to be understood that the invention is not limited to the details disclosed but includes all such variations and modifications as;fall within the spirit of the invention and the scope of the appended claims. 1

In the drawing:

Fig. l is a plan view illustrating the present method of making an abrasive-cut-off wheel;

Fig. ;2 is a front elevational viewof a wheel made in accordance with the present invention, the view being on alarger scale; Fig. 3 is a detailed sectional view taken as along the line 33 of Fig. 2, the View being on a further enlarged scale; and

Fig. 4 is a detailed sectional view on the scale of Fig. 3 and taken as along the line 4-4 of Fig. 2. Abrasive cut-off wheels or discs of relatively large diameter, as for example, a diameter of 36",, are in demand. However, the manufacture of such wheels as heretofore practised involves the use of relatively large and expensive equipment not available to the smaller manufacturers of, abrasive cut-ofi wheels. The present invention provides a method whereby abrasive cut-off wheels of substantially any desired diameter may be made without the necessity of the manufacturer beingprovided with large, expensive equipment. In addition, the abrasive cut-off wheel resulting from the practise of the present novel method has many desirable characteristics not to be found in abrasive cut-off wheels as heretofore manufactured.

1 Referring in detailto the drawing and at first 8'Claims. (Cl. 51293) I more particularly to Fig. 1, an abrasive cutwff wheel is manufactured according to the present invention by preparing a series of strips of abrae sive grain and a suitable bond. Depending on the use to which the abrasive cut-oil wheel is to-be put, the bond employed may be resinoid, rubber, or the like. In making a wheel of say 36" iam, eter, a pair of said strips I0 and I I of 'approxi mately 19 in width arelayed up in side-by-side relation with their edges spaced apart as at I2. These strips are layed in parallel or substantially parallel relation and the space l2 may be up to a quarter of an inch. I

Then a second pair of strips I3 and I4 of the abrasive grain and bonding medium are layed in side-by-side relation across'the strips I0 and I I.

Strips I3 and I 4 will also each be approximately 19 in width and aredisposed with a slight space between them as at I5, this space, being approximately the same as the space I2 and the strips being in parallel or substantially parallel relae.

tion. Now, a disc or wheel I6, as indicated by the dot and dash lines, is blanked from the laminated structure built up by the two layers of strips." The strips of one layer are angularly disposed with respect to the strips of the other layer and pref? erably the strips-of one layer are at rightangles to those of the other layer whereby the spaces l2 and I5 intersect or cross at right angles. The point of intersection or crossing of the medial lines of the spaces I2 and i5 will be the center or the theoretical'center of the wheel I6. 2

As or after the wheel I 6 is blanked out, an arbor opening [7 is blanked through the center of the wheel as suggested by the dot and dash lines'in Fig; .1. f Makingthe wheel as described, it will be noted that each strip (two strips in thepresent instance) of each layer extends through two edges of the wheel. Further, the space I2 opens through one side of the wheel, in Fig. 1 the near side,'while the space I5 opens through the back or far side. j

The wheel blanked from the laminated structure as described is cured in theusual or any desired manner. For example, if the bond isof rubher, it will contain sulphur and the other necessary ingredients and the blanked wheel will be cured by vulcanization. If the bond is resino-id, the blank wheel will be cured by any of the known processes for accomplishing the desired cure.

The structure of the resultant wheel, is better illustrated in Figs. 2, 3 and 4, and there the same. is generally designated 20 and actuallycomprises two upper and two lower strips in the form of segments, designated respectively 21,12, 23 and provides a channel or groove 26 1 24. Each segment shaped strip is approximately a half a circle but then the strips of the respective layers are slightly spaced from one another in their adjacent edges. Thus, the spacing of the the wheel in one face therethe strips '23 and 24.

Similarly, the spacing of the strips 23 and 24 extending dimetrically across the opposite face of "the Wheel and at right angles to the channel 25 and which channel 26 is closed on its upper side by the strips 2| and 22. Where all of the strips include the;

; same or a similar bonding medium, or'whe're the bonding medium of each stripis compatible with the bonding material of each of the other strips,

the curing operating will result in the formation 1 y of a-homogeneous or substantially homogeneous structure. If desired, the. strips of one layer may be secured to those of the other layer'by a suitable adhesive. This is suggestedin Figs. 3 and 4 where the respective layers of the laminated structure are shown asseparated by dotted lines.

In using the present cut-off wheel, the channels 25 and 26 serve a purpose. in f or the carrying of a cooling medium directly into a out being made. Where these wheels operate in a Hood of coolant, the'channels will be filled with the coolant and as, each channel moves into the cut, coolant, will be carried into the cut. The

coolant will be carried into the cut at alternate sides of the wheel since the channels are at alternate sidesof thewheel.

The abrasive cutting wheel of the present. in.- vention and constructed, accordingto the. present method, is very practical and efiicient, for its;in-.

tended purpose. Since a substantially homogenous structure is provided, each segment of, the wheel, braces, the other segments. In addition to providingthe channels 25 and 22.6, the spacing of the strips. prior to the blanking of them and the maintenance ofv this spacedrelation. keeps the segments or strips of each layer from working against or causing breakage or chipping of the, adjacent edge of the other segments or strips .of said layer when the wheel is in use.

Having thus set forth the nature .of my Jim vention, what, I claim. is:

l. The method of making an abrasive cut-oil wheel comprising preparing strips of abrasive grain and a. b.ond,,preparing aflaminated structure by laying a first pai'rof said strips in sideby-side: slightly spaced substantially parallel relation, laying a second pair of said strips across and substantially at right angles to the. strips of the first pair and. in slightly spaced substan.- tially parallel relation to one another, blanking a disc from the. laminated structure so built up with the center of said disc, substantially at the point of crossing of a pair of lines bisecting the spaces between. the respective pairs of strips, and'then curing said blanked disc.

2. The. method. ,of making an abrasive cut-oil wheel comprising preparing strips. of abrasive grain and a bond, 'preparing a laminated. structure by laying up' layers of, said strips with the strips of .each layer longitudinally spaced from one another and the strips of each layer at an angle to those of thenext adjacent layer whereby the space between the, stripsv of one layer cross the space between the strips of the next adjacent layer, blanking; a disc from the laminated-strait ture so built upwith each strip of each layer and the space between the strips of each layer ear-- that they provide crossing spaced from one another and with suchstrips of each'layer at an angle to those of the next adjacent layer whereby the space between the strips of one layer-crosst'he space between the mentioned strips of the next adjacent layer, blanking a disc from .the laminated structure so built up withlfeachmentioned "strip of each layer and the spacegbetween each mentioned strip of each layer extending to two edges of said disc, and then curing said blanked disc.

.4. The-method of making an abrasive cut-off wheel comprising preparing strips of abrasive grain and a bond, preparing a laminated structureby laying up la ers o'f'said'strips Willhj ilhe strips of each layer'substantially'at "rightangles to those of the .nextfadj'acentlayer, blanking a disc from the laminated structure so bunt up with each strip H of each layerfextending fto edges of saiddisc, and then curingsaidblanked disc. T

5. The method of making an abrasivecut-off wheel comprising preparing iStilpS of abrasive grain an'cl'a bond, preparing a laminated strutt ture by laying up layers of said'stripswith at least two strips of each layer longitudinally.

spaced mm one another'and withsaidtwoi strips of onelayer substantially at right angles tothe said two strips of :the other layer, blankinga disc from'the lamina'tedstructure so built 'up'with each strip of eachlayer extending totWo edges of" said disc, and then curing' said blanked disc.

I 6. The methodof 'ma-kingan abrasive i cat-eff wheel comprising preparing strips {of abrasive grain and abond, preparing a lamii-iated struc ture by ,layinga; first pair of said strips ins "e by side' slightly spaced substantially parallel relationflaying a second pair'ofsaid stripsacross and substantially at right angles-to the strips of the first pair and in slightlyspaced substantially parallel relation to oneanother', blanking "adisc from the laminated structure so built-=-up with the center of said disc substantially at thepoint of of a pair of lines bisecting' 'tlie spacesbetween the respectivepairs of strips, 'h 'ng the bond or 'eachof said strips compatible-with th'e bond of each of the otherstripsgandthencuring said blanked disc anddhering-engagi-ng strips through theirc'ompat' ble bonds whereb-ya sub stantially homogenous structure is provided.

'7'. The method ofinaking an abrasiWe 'cutofi wheel comprising preparing strips- 0f 1 bit grainand a bond, preparing a'l-amina ture-by laying up layers of said stripslw'ith 'the strips of each layer longitudinally-"spaced rmm one another and with-the strips ot each layer at an angle to those 0f" the nextadjacent ia'yer where-by the space between the stri s of one layer- -cross the space between the Y strips of the next adjacent layerfblanking a disc-from. I e

strips of said abrasive grain and bond, having at least two strips of each of said outer layers longitudinally spaced from one another and with such strips of each such layer at an angle to such strips of the other such layer whereby the space between such strips of one outer layer crosses the space between such strips of the other outer layer, blanking a disc from the laminated structure so built up with each mentioned strip of the outer layers and the space between each such mentioned strips extending to two edges of the disc, and then curing such blanked disc.

HUGH V. ALLISON.

REFERENCES CITED The following references are of record in the file of this patent: 4

5 UNITED STATES PATENTS Number Name Date 725,761 Nash Apr. 21, 1903 927,164 Puffer July 6, 1909 10 1,616,531 King Feb. 8, 927 2,031,105 Hall Feb. 18, 1936

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