US2640477A - Grinding wheel dressing apparatus - Google Patents

Description

June 2, 1953 H. G. NORLANDER 2,540,477

GRINDING WHEEL DRESSING APPARATUS Filed Sept. 18, 1951 INVENTOR. HELG-E G. NORLAP/DER Patented June 2, 1953 GRINDING WHEEL DRESSING APPARATUS Helge Giista Norlander, Stockholm, Sweden Application September 18, 1951, Serial No.

In Sweden October 4, 1950 i I 2 Claims. (Cl. 125-11) The present invention relates to an apparatus for dressing grinding wheels and more particularly to an apparatus for dressing a grinding wheel while the latter is being used.

One of the objects of the present invention is to provide an apparatus for dressing a grinding wheel while the latter'is being used so that objects may be ground under mass production methods while maintaining the trueness of the grinding wheel.

A further object of the present invention is to provide an apparatus of the above type which derives its movement solely from the translational movement of the grinding wheel support.

Another object of the present invention isto provide anapparatus of the above type which is fully automatic.

A still further object of the present invention is to provide an apparatus of the above type which does not require any gearing or other power transmission means to automatically dress the grinding wheel. I

Yet another object of the present invention is to provide an apparatus of the above type which only removes material from the grinding wheel in order to dress the same simultaneously with the use of the grinding wheel and by amounts corresponding to the wear of the grinding wheel during the use thereof.

The novelfeatures which are considered as characteristic for the invention are set forth in particular in the appended claims. The invention itself, however, both as to its construction and its method of operation, together with additional objects and advantages thereof, will be best understood from the following description member 2 is mounted and guided for slidable movement in the direction of the arrow shown at the upper part of the drawing. The grinding wheel 3 is' mounted on the support member 2 for rotation withrespect thereto and is adapted to bemoved in translation with support member, '2 in-the direction of the arrow shown atthe top. part of the drawing. Located on the base'me'm her i is a rotatably mounted work holding means H, which is diagrammatically illustrated in the drawing and which may be any suitable chuck,

for example. The work piece I3 is supported in the work holding means [4 so as to be ground by the grinding wheel 3, and it is evident that as the diameter of the grinding wheel decreases,-

the supportmember will :be moved in the direction of the arrow shown. on the top part of the drawing so as to maintain the grinding wheel in contact with the work piece 3'. Duringv such translational movement of the "grinding wheel,

the latter moves in aplane perpendicular to its axis and along a straight line extendedtoward' the work holding meansl l; As is apparent from as shown in the drawingyor may be a separate member fixedly connected thereto.

A mounting means lior mounting dressing tool means 5 is located adjacent to the grinding wheel 3. The dressing tool means 5 is adjustably located in the mounting means-"4 by any suitable device, sucha's, for'examp'le, the screw member I 2 which engages the mounting means 4 and the dressing tool means 5 for adjustably locating the latter in the mounting'means 4. The mounting means 4 is provided with a sleeve portion 6 hav ing a boreextending therethrough.

Fixedly mounted on the base member I is the; shaft 1 which extends through thebore of the sleeve portion 6, and'a key. member mounted on the shaft 1 may be seen in the drawing, this key member engaging a keyway formed in the bore of sleeve fi "so that the mounting means 4 is mounted only for sliding movement along the shaft 1 in the direction of the arrow shown on" sleeve portion 6 and'cannot rotate about the shaft I. 'The axis of shaft I is" located in the 3 above-mentioned plane perpendicular to the axis of the grinding wheel 3 and makes a angle with the straight line along which the, grinding, wheel 3 moves in translation in said plane when the support member f2 is linearly moved during the wearing away of the'grinding wheel a.

The extension 9 fixed to the mounting means 4 projects therefrom and has rotatably mounted thereon the roller 8 which engages the slot [0 of projection l I. As a resu lt of this interconnection between the support member 2 and'the -moun ting means 4, the movement of the support member is transmitted to the mounting means to move the same along the shaft 7, and the dressing tool means 5 is thereby constrained to move along a line at 45 to the straight line along which the grinding wheel moves in translation and at .a rate of speed which is /2 times as great as the rate of movement of the grinding wheel 3 and the supporting member 2 toward the work holding means l4.

As a result of the above construction, the dressing tool means is maintained in contact with the periphery of the grinding wheel 3 while the latter operates upon a work piece [3, for example, so that during the time that the grinding wheel decra in d ame om h size s o n in solid lines in the drawing to the size showing dotted lines", the dressing tool means 5 moves from the position I to position II. Thus, the 45 angle of the dresser mount keeps the dressing tool means 5 in the horizontal diametrical line of the grinding wheel and moves the tool means 5 an amount radially of the wheel corresponding to the reduction of wheel diameter due to wear which is substantially the amount the wheel is lowered to maintain contact between the wheel and the work.

The above described apparatus is particularly suitable where extremely accurate grinding is required in the mass production of various articles. For example, the above apparatus is particulars ly'suitable for the grinding of rollers, drills, and in connection with the grinding of twist drills, the above apparatus is particularly suitable for the grinding or spiral grooves in these .drills. In the grinding of exceedingly small twist drills, even the slightest variation in the spiral grooves produces an exceedingly inferior drill because such variation will tend to cause the drill to drill along a line inclined to its axis. The above apparatus, however, guarantees the proper grinding of accurate spiral grooves under mass pro.- duction methods.

The dressing tool means 5 is more or less schematically illustrated the drawing, and it is evident that the invention ma be used with any type of dressing tool.

It will be understood that each of the elements described above, or two or more together, may also find a useful application in other types of grinding wheel dressing apparatus diifering from the types described above.

While the invention hasbeen illustrated and described as embodied in an apparatus for dress.- ing a grinding wheel .while the latter is being used, it is not intended to be limited to the deails shown. since various modifications and structural changes may he made without departing in any way from the spirit of the present nven io Without jurther analysis, the foregoing will so fully reveal the gist of the present invention that th rs can by a p yin cu rent knowledge readily dap it for arious a plications without omittin atu es that f om h st ndpoint of p i r a lm on t ut ess n ial haracte istics of the eneric r p ific a p c r this inve t n and, t'r i e uc adapt s ould and are i nded to b c mii e deli w t in h me nin and ran'geo'f equivalgge of the rollowillg claims.

What i laim d as n and e ired to b eu ed b t i ers'raemr V A'eri d ns PPeratus ompri ng n some ne ion u pqrt"m a 1s moaned iotlin ar ovemen a r n in when r u ly mounted on sa d o t m a s tar-r tati n w t r ect here o and for pr empt am n. tb r w th so ha s id grindin wheel goes alon straight line located in a predetermined plane perpendicular to the'axis of said grinding wheel; a mounting member located adjacent to said grinding wheel; fixedly mounted guide means operatively connected to said mounting member for moving the same toward said first straight line along a second straight line located in said plane and making a 45 angle with said straight line; lrfissing 9- d-Q 2 3 1 3 m n on said mounting member and located in engagement with the periphery of said grinding wheel; and connecting means interconnecting said mounting member with said support means for moving said mounting member along said second line on y upon movement of said support memher, said connecting means comprising a guide portion extending from said support means for movement therewith and being formed with a slot extending in a direction perpendicular to the linear movement of said support mean and a roller member mounted on said mounting memher and engaging said slot.

2. A grinding apparatus, comprising in com,- bination, work holding means; support means mounted for linear movement toward said work holding means; a grinding wheel rotatably mounted on said support means for rotation with respect thereto and for linear movement therewith so that said grinding wheel moves along a first straight line located in a predetermined. plane perpendicular to the axis of said grinding wheel and extending toward said work holding means; a mounting member located adjacent to said grinding wheel and being formed with a bore extending therethrough; a fixedly mounted shaft member located adjacent to said grinding wheel and having the axis thereof located in said plane and making a 45 angle with said straight line, said shaft member extending through said bore of said mounting member to support the latter for slidable movement along said shaft member; dressing tool means fixedly mounted on said mounting member and located in engagement with the periphery of said grinding wheel; and

connecting means interconnecting said mounting member with said support means for moving said mounting member along said shaft only upon movement of said support member, said connect, ing means comprising a guide portion extending from said support means for movement therewith and being formed with a slot extending in a direction perpendicular to the: linea movem nt of said support means and a roller member mounted on said mounting member and engaging said slot, whereby said dressing tool means is; maintained in contact with the periphery of said grinding wheel as the diameter of the latter decreases during use on a work piece mounted on said work holding means;

GQSTA N Refe e c s C te in th fi Of h Patelit UNITED: STATES PATENTS

Images