US2380451A - Disk diamond dressing tool - Google Patents

Description

c. J. KOEBEL DISK DIAMOND DRESSING TOOL Filed April 19, 1943 (Ittomeg I a new and improved type of diamond dressing tool shoulders ii-d and lle. Because of the presence of these steps or shoulders ll-d and il--e on the wheel it is necessary in step grinding to employ either a single point tool or, if a multiple tool is employed, to have the-diamonds arranged in a singlerow lyingin a plane transverse to the axis of the wheel so that the diamond points on the tool may enter into, and properly form, the

' contour of the shoulders; I l-d and ilfe..

invention will be understood more fully from the following more detailed description and by'reference to the accompanying drawing forming a part hereof wherein a. Fig. 1 is a plan view showing a tool of the.

present invention in position I for dressing a stepped grinding wheel. v Fig. 2 is a view in side elevation with the grinding wheel broken away toshow only a fragmen tary part thereof.

Fig. 3 is an enlarged somewhat diagrammatic" view in side elevation of the dressing tool of the present invention to illustrate the. manner'in which the diamonds thereof may be successively presented to the dressing. tool to be dressed.

It is of the utmost importance in the use of to the wheel atthe proper angle. It is found in actual practice that unless a diamond dressing toolls positioned at an angle to the surfaceoi' the wheel being dressed that there is a great tendency forthe tool to gouge into the wheel. when this' occurs'the grinding face of. the wheel is not any-marred so that considerable additional dressing. thereof is. required to put it into proper working condition, but when a diamond dressllllztOOlOl-IKES intothe wheel, the reaction force's are such that a heavy strain is placed upon me diamond which tends either to break the diamond or to dislodge'it entirely fromthe tool shank.

When the diamonds are dislodged from the tool shank they frequently may be thrown a considerabl'e distance so that they are frequently irrevocably lost, and as the diamonds are quite expensive, it is highly important that gouging of the tool into the wheel be obviated as far as posdiamond dressing tools that the too] be presented The tool of the present invention consists of I a tool shank providedwith a yoke 2iconsisting of the spaced laws 22, 23. provided-with a three led hole for the reception of the threaded end o. a cap screw 24. the jaw '22 having a through, or unthreaded hole, for said screw, .Mountedon the screw 24 and within the space between the laws 22, 22 isthe diamond dressing tool 25 of the present invention. The tool 25' is in the form of ,a narrow wheel, or flat cylindrical disk having a plurality of diamonds embedded in, the material of. the disk 25 and projecting from the periphery thereof. Thedisk 251s preferably constructed of sintered material consisting of a mixture of powdered metals, such as described in the co-pending patent application of Lindqvist-Martin, Serial No. 435,702. 'The diamonds 26 are suitably arranged in equally spaced j relationship around the periphery of the disk,

when. the metals are in powdered form after' which the metal powder is sintered and pressed. simultaneously into a compact, coherent and rigid J form with the diamonds firmly embedded therein and secured to the disk so that they project radially from theperiphery-thereo! tosubstantially the same extent-and. along substantially in the same circumferential line. The present invention' however is not limited to the setting method described above. as 'thediamonds may be secured to the disk by other sintering methods or bycastsible. -It has been found in practice that a dra angle varying from 3 to 15 degrees, in accordance with circumstances, gives the most satisfactory results. The showing of Fig. 2 in the drawing whereinthe arrow indicates the direction'of' rois inclined downwardly from a line normal to the circumference'of the wheel at the point of contact of the tool with the wheel illustrates the drag angle referred to. p

The types! grinding known as form grinding or step grinding and wherein the grindingwheel is dressed toa pre-determined contour tocorrep nd to the finished contour of a workpiece to ,be fabricated presents different problems with respect to the dressing of the grinding wheel than are encountered when a grinding wheel havinsr a straight cylindrical contour isemployed. As the tool of the present invention is particularly adapted for the dressing of grinding wheels for either form or step grinding, as well as for ordinary straight cylindrical grinding wheels-the tool has been shown in the drawing in connection with a step grinding wheel. As shown in Fig. l, the

tation of the wheel Ii and wherein the tool 20 4 theiaw 22 of the yoke 2|, the inner end ofthe grinding wheel ii is indicated as being provided with three cylindrical grinding surfaces I l-a, i i--b and I i-cof different diameter which results in the formation on'the wheel of the steps or ing, brazing or peening the diamonds into a suitable-metal disk.

One side face of the disk-2B preferably'has formed thereineither. during the pressing and sintering operation, or by. any other suitable method, a plurality of grooves 21, or drill spotted depressions. there being the same. number of groovesin the side face of the wheel as there arediamonds in the periphery thereof. The grooves 21' are intended to function as locating means to insure thatthe wheel will be held in proper position relative to the diamonds provided in the face of the wheel and for this purpose suitable means such, for example, as the screw 22 is provided in screw 22 having a reduced tip 22 adapted toengage within the grooves 21. a v The manner in which the dressing tool is em ployed is as follows:

The disk 26 being mounted within the yoke 2'l is adjusted to bring one of the grooves 21 in alignment with the pointed tip 29 of the screw 28 after which the screw 24 is tightened to secure the disk rigidly between the laws 22, 22 of the yoke, the

clamping action of the inner faces of the jaws 22, 22 against the side faces of the disk and the engagement of the pointed end 29 of the screw 22 with the groove 21,- holding the disk securely againstrotation. The grooves 21 are positioned relatively to the diamonds 20 so that when the tool is'presented to the grinding wheel Ii at the proper drag angle, as illustrated in Fig. 2, two diamonds simultaneously attack, or engage the face of the wheel. 'When, after a certain period of use,the diamonds have been worn flat. or dull.

the screw 24 is loosened and thedisk 2| is turned The law 23 is.

tion (assuming that the wheel is originall'yzpro vided with 32 diamonds) or the equivalent oftwo to bring into engagement-with the" pointed. end

assoaer 29 or the screw 2. the groove 21 which isfspaced two grooves-from the one with which the screw 2|! formerly was engaged.

The manner in which the diamonds are successively brought into engagement with the grind- 1 ing, wheel can perhapsbest be understood by reference to the enlarged: view Fig. 3 ofQthe, drawing wherein the grinding wheel [Land the diamond dressing tool. are respectivelygillustrated by theg numerals II and 25, the points"A, B representthe location of two of the diamondsoi toolll. which may be assumed tohavez; been originally employed at the beginning 01' use not thetool After the two diamondslocated at points A and B have been wornto such anextent thatthey no longer work eflectively, the screw .24 is loosened and the wheel 25 rotated through ,4 of a revolu grooves 2|;-this:will bring the diamonds atlthfe points indicated at c and B into operative posi-i tion to engage the face of the grinding wheel H;

3 comprising 'a tool shank havingat'lone end thereof; opposed clamping means a fla t cylindrical-v shaped disk carried byLsaid clamping means, a

Thisv operation isrepeatedin equal increments] aroundthe receioi thetdisk until the diamonds located at the points, E and! have been used,

after which the tool','.or disk, will-then herefaced! the tool are pressed or the grinding wh n; 1 t

Having thus described my, invention sire to secure by Letters Patent is:

1. A diamon'ddressing tool. omprising anar- *row cylindrical disk carrying a number of small diamonds arranged in 'substantially'equally spaced relationship around, and projecting, partially irom, theflperlphery of said disk, and means for to present more than one diamond contact simultaneouslyto said wheel,- the spacing oi.- saldjhold- \ing meansrelative' tojthe spacing oi-saiddiamonds beingj' suchjthat uponsubsequent settings of saidfdisktore presentiany one-oi said diamonds tojsald' wheels it will bein a different;

angular position "thaniln its immediately "preceding operable setting. r 2. A diamond tool for dressing a grinding wheel plurality of ismall'fdiamonds arrangedin substantially I equally spaced, relationship around, and

' projectingfpartiallyjfrom, the-periphery of said.

tated only through /52 or a'revolution whichewill bring the diamonds located at the pointsE and'jA' into operative position, thus, pr nling "them to the face of the grinding ,wheel at a diflerentang'le.

ffrom that in which they were formerly used.

After the diamonds atEandA have beenagain.

worn down in their new position of use, the wheel isnext again rotated through lit ora revolution I as before, or the-equivalent of two grooves. 21 to disk, means-for tightening said cla'mpingmean'sagainst. the side rete t: said disk tojliold the f same against rotation during a, wheel dressing: operation, saiddisk and said clamping means heing provided with inter-engaging locking means toserve to, locate said disk with at least a pair I of said diamonds in'proper pre-determined relabring the diamonds B and C in operative position i 7 After the disk 25 has been rotated through a comr plete 360 degrees of angular rotation back to the point where the diamonds E and A- are again pre- 1 sented, the tool is then movedto bring the diamonds A- and B again into positions to engage the ,face or the grinding wheel that was occupied by- 4 them in the first use of the tool,

3 these two diamondswould 'be worn 'to such an tionship to engage }thejface of'the'wheel to be dressed and to hold. said disk' against rotation during the dressing operation, and said interengaging means being so arrangedrelativelyfto the-spacing of 'saiddiarnon ds'lthat the members of each pair of diamonds which engage the wheel on each setting will be different, after eachcomplete rotation of said disk, from those whichengaged the wheel in each setting of said disk during such rotation.

3; A diamond tool for dressing a grinding wheel comprising a tool shank having at one end there-- of a yoke consisting of a pair of clamping jaws,

i a flat cylindrical shaped disk mounted between said clamping jaws, a plurality of small diamonds arranged in a single row in equally spaced relationship around, and projecting from, the face Due tothe fact that the diamondsA andB in j the second use of the tool were presented to the wheel in different relative positions. than that in which they stood in'their first use, the faces or of said disk, at least one of the side faces of said disk and at least one of said jaws, being provided with cooperating, inter-engaging locking meansv to serve to bring at least a pair of said diamonds simultaneously into operative relationship with angle that they will again present new sharp and effective cutting edges of the tool when re-set =fi back to their original positions.- 1 v 4 It will be understood that the present'tool is firmly held against rotation when used to perform a wheel dressing operation and that due to the circular or cylindrincal outer periphery of the tool, and the re-setting movement oritthrough the small amounts of angular rotation results in presenting the diamonds which engage the wheel to the wheel at a different drag angle after 'each' re-setting than that at which they were pre-' sented at the former setting. It will therefore be understood that the present tool,'and the manner in which-it is to be used, is to be distinguished from the use or a plurality of small diamonds mounted within the face .of a disk which is mounted for rotation in a tool holder and which,

1, is permitted to rotate when the diamondsinthe the face of thewheel tobe dressed and means for clamping said jaws against the side faces of I 7 said disk and to hold said inter-locking means in engagement to prevent rotation of said disk during a wheel dressing operation, and said inter- ,engaging means being so arranged 'relativelyjto s the spacing of said diamonds that the members of each pair'oi diamonds which engage the wheel on each setting will be different, after each complete rotation of said disk, 'fromthose which ena ge the wheelin each settingof said disk dur 'ing such rotation. g

4. A diamond tool for dressing a grinding wheel comprising a tool shank, a fiat cylindrical shaped disk carried thereby, a plurality of small diamonds arranged substantially in' a cylindrical plane in substantially equally spaced relationship around and projecting partially from, the periphery of said disk, said disk and clamping means each be- 3, against the periphery I whatI=deholding said 'disk. ag"ain st' rotation in adjusted; position Iordressing a grindingwheeland soras' ing provided with inter-engaging indexing means arranged in definite Dre-determined relationship with respect to said diamonds so as to locate the members of a pair of adjacent diamonds substa.n.. tially in equally spaced relationship on each side of the plane passing through the center of said disk and the center of the grinding wheel to be dressed with said pair of diamonds in contacting operative engagement with the periphery of said grinding wheel, and said inter-engaging means being so arranged relatively to the spacing of said diamonds that the members of each pair of diamonds which engage the wheel on each setting will we different, after each complete rotation of said disk, from those which engaged'the wheel in each setting of said disk during such rotation.

5. A diamond tool for dressing a grinding wheel comprising a tool shank, a flat cylindrical shaped disk carried thereby, a plurality ofsmall diam-lnds arranged substantially in a cylindrical plane in substantially equally spaced relationship around, and projecting partially from, the periphery of said disk, said disk and clamping means each being provided with inter-engaging indexing means arranged in'definite pre-determined relationship with respect to said diamonds so as to locate the members of a pair of adjacent diamonds substantially in equally spaced relationship on each side of the plane passing through the center of said disk and the center of the grinding wheel to be dressed with said pair of diamonds in contacting operative engagement with the periphery of said grinding wheel, and means for tightening said clamping means to hold said disk in indexed position, and said interengaging means being so arranged relatively to the spacing of said diamonds that the members ing such rotation.

oi! each pair of diamonds which engage the wheel on each setting will be different, after each complete rotation of said disk, from those which engaged the wheel in each setting of said disk dur- 6. A diamond tool for dressing a grinding wheel comprising a tool shank, a flat cylindrical shaped disk carried thereby, a plurality of small diamonds arranged substantially ina cylindrical.

plane in substantially equally spaced relationship around, and projecting partially from, the periphery of said disk, inter-engaging indexing means carried by said disk and said tool shank, the interengaging means on said'disk being arranged in definite pre determined equally spaced relationship to provide an index point corresponding to each of the diamonds carried by the periphery of said disk and cooperating with the inter-engaging means of said tool shank to locate the members of an adjacent pair of diamonds in substantially equally spaced relationship on each side of a plane passing through the center of said disk and the center of said grinding wheel, and means for tightening said clamping disk to hold the members'of an'adjace'nt pair of diamonds simultaneously in contact with the periphery of the grinding wheel and against rotation during a, wheel dressing operation, and said inter-engaging means being so arranged relatively to the spacing of said diamondsthat the members of each pair of diamonds which engage the wheel on each setting will be difierent, after each complete rotation of said disk, from those which engaged the wheel ineach setting of said disk during such rotation.

CHARLES J. KOEBEL.

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