US2047869A - Grinding machine - Google Patents

Description

July 14, 1936. I s. J. HARLEY GRINDING MACHINE Filed Sept. 22, 1934 2 Sheets-Sheet l July 14, 1936. 5. J. HARLEY GRINDING MACHINE Filed Sept. 22, 1954 2 Sheets-Sheet 2 thread profiles of screw thread chasers and the ing th grinding wheel h Patented July 141, 1936 UNITED STATES PATENT cities 7 2,047,869 GRINDING MACHINE Stanley Jafia Harley, Stivichall, Coventry,

, England Application September 22, 1934, Serial No. 745,138

In Great Britain October 10, 1933 7 Claims. (CI. 5135) This invention relates to form grinding, inmove so that the locus of any point in the wheel cluding the formation o t e Op ra g Surface is that of the form it is desired to produce in the of the grinding wheel itself as well as the formawork-piece or in the acting face of the wheel as tion or finishing .of the work piece thereby. the case may be. The object ofthe invention is to provide cons t t t of 'structions'of grinding machine alternative to the eusly jmpartnd to kind in which for the purpose of genera in by at will according to the form it is desired to gena grinding operation such continuous forms as erate by the grinding or cutting operation. are "met within screw threads and the screw I th construction h n t a b, carry...

is moved in a 10 ane of rotation like, where a particular form has to be epea d direction at right angles to the pl without a break, provision is made for relative of the grinding wheel stand for movement between the rotating grinding wheel mou ted upon secon lid 6 a and the work-piece or wheel cutter, as the case along the bed 1 of the machinei 1 3 may be. allel with the axis of the grinding wheel by means This relative movement is produced according of a le d s rew g r tat bl to the present invention either by giving the wheel in a bearing carried by the acompound movement relatively to the worknd adapted for rotation by piece or cutter or by moving thewheel in one threaded en of the lead 50 mounted at one end bed of the machine hand or power. The rew, which is axially 0 direction whilst at the same time the workpiece stationary, works in a tapped boss 2' on the slide 5 In either case the two movements whether inscrew, a cam is employed 0 or cutter is moved in another direction. e, the return movement of which can be efiected 0 h d movements a preferably t i a by reversing the direction of rotation of the lead "the compound movement being the resultant of screw in any suitable manner, and preferably at two simultaneous rectilinear movements, but in a higher speed than that producing the forward each case one may be angular or rotational. movement of the slide. If, instead of a lead 25 dependent or constituents of a compound moveof the slide 9 the latter, r 'ment are of such relative and respective extent be kept in constant contact with the cam by as to produce the form required by generation means of a spring or a s as distinguished from the movements derived by cam spindle being mounte the use of a pattern or former. by the bed of the machine.

The invention is particularly app a to The simultaneous movement of the slide b in grinding machines for use in produc ng screw the other direction, for threads in solid material by means of a multit th rot tio l xi of ribbed grinding wheel. be produced, as sho In the accompanying drawings: spindle Z of which Figure 1 is aper p iv vi w f e m f bracket m carried by the slide e. grinding machine included within the present int ti speed of thi vention. the nature of the form to be ground in the work Figure 2 is a similar view of an alternative or t i th wheel. The said cam may, as shown, 40

40 construction. be driven through suitable reduction gear n which F ure 3 is a perspective view of a further modican be varied at will by changing the gear wheels,

fication. from the spindle of the lead screw 9, or cam,

In the arrangement shown in Figure 1 the h h is responsible movement which is required to generate the conslide tinuous form required either in the acting face of the grinding wheel or in the work-piece is given to the grinding wheel head, the Work-piece or wheel cutter being stationary. For this purfor the movement of the For this purpose the spindle Z of the 45 cam k which operates the slide 2) may carry a worm wheel 0 meshing with a worm p which is slidably mounted on a feather on a shaft q which is driven by the reduction gear aforesaid.

5O pose the grinding wheel head a is carried by a Alternatively, the cam is operatingthe slide 17 slide bwhich is arranged for movement relatively may be carried by an extension of the lead screw to the stationary holder 0 for the work-piece or g Where the form to be produced either in the cutter in wo directions Simultaneously, the work-piece or in the acting face binded effect of which is to cause the wheel whilst wheel is that of the profile of a screw thread the 5 in contact. with the work-piece or the cutter to ratio of the two movements imparted to the slide equal to the pitch carried by a slide b 1 and away from theoperating face of the ing wheel, and the wheel head arranged to have 2 b carrying the grinding wheel head a will be such that whilst the slide e moves through a distance of the screw thread, the cam is which simultaneously reciprocates the slide 17 towards and away from the acting face of the grinding wheel, makes one complete revolution.

In the modification shown in Figure .2 one of the two movements, the resultant of which is responsible for the form requ red in'the work or in the acting face of the wheel, is. imparted to the grinding wheel head and the other to the work-piece or to the wheel cutting or truing device, as the case may be. In the construction shown, the wheel head ais carried bya slide e which is arranged for movement along the bed" 3 of the machine by meansof a lead screw 9, or by means of a cam, in the same manner as above described with reference'to the slide e in Figure 1. In this case, however, the wheel cutter is which is adapted to be re ciprocated acrossthe bed of the machine by means of a cam in a similar manner to the slide b in Figure l. The movements of the two slides e andb take place simultaneously, being derived from a common shaft and are of such relative and respective extent as together" to slide e moves through a distance equal to the pitch of the thread profile the cam 70 operating the slide 22 makes one complete revolution. As

'analternative to the construction shown in Figure 2, the slide 11 carrying the cutter or the workpiece, can be moved along thebed. of the machine across the operating face of the wheelby means of a lead screw or a cam, in which case the wheel head will at the same time be moved to and fro across the bed of the machine by means of a cam.

, In the further modification shown in Figure 3 the grinding wheel cutter or the work-piece c is fixed to a spindle c journalled in the bed 7 of the machine so as to be capable of rotation in a plane at an angle to the plane of rotation of the grinding wheel. The grinding wheel head in this case is carried by a transverse slide e and is moved towards and away from the cutter or workpiece 0 by means of a cam 10 which is carried by ashaft rotatably mounted in the bed of the machine and'is held in contact with a stylus m r on the transverse slide e by means of a spring or weight (not shown). The spindle 0 can be driven by means of worm and wheel gear 0 19 as shown,'or in any'other suitable manner and,

' together with the cam-shaft, is operated from a common shaft so that there is a positive relation, which can bevaried at will, between the reciprocating movement of the wheel headan d the angular or. rotary movement of the cutter or. the work-piece. I 7

Alternatively, the cutter or the wdrk-piecemay be rigidly mountedon a slide arranged to [be reciprocated across the bed of the machine towards i 0, p, as shown, or v an angular movement relatively to the cutter .or work-piece about a fixed axis at an angle to its normal axis'of rotation. 7

Instead of giving an angular movement to the wheel head and a rectilinear movement to the wheel cutter or the work-piece, or vice versa the work-piece or cutter, or the wheel head may be fixed and the wheel head or; the work-piece or cutter as the case may be, may be'carried by a reciprocating slide and also have an angular movementthereon about an axis which inthe case. of the wheel head would be at an angle to the V rotational axis of the wheel.

In every' case, the grinding wheel can either be driven by belt gear as shown, or by means of an independent. electric or hydraulic motor carried bythe wheel head,

The invention is not limited in its application to the formation of screw thread andgear tooth forms since by usingcams of appropriate shape and rotational speed, the combined movements of the wheel head or of the cutter or workfpiece, V

or the relative movements of the said wheel head and the cutter or work-piece asthe case may be,

may be caused to'produce forms of any desired continuously repeated shape. r

I claim:--

1. A' grinding machine for the purposes described comprising a fixed frame, a grinding'wheel' head movable relatively thereto,, a "grinding wheel rotatably mounted in said head, a carrier adapted to receive a work piece or awheel-forming device, and interconnected means for imparting relative movement between said carrier and said grinding wheel simultaneously in two directions substantially normal to each other, the direction of one movement being across the face of the grinding wheel and'the other movement being in a radial plane towardsand away from the rotational axis of said wheel. I I

2. A grinding machine forthe purposes described comprising a fixed frame, a slidemovable relatively thereto a grinding wheel head carried by said slide, in said head, a carrier rotatably mounted in the said frame and adapted to carry a work-piece or Q a wheel forming or truing device and means for a grinding wheel rotatably mounted r moving said slide in a plane normal to the operat- 7 ing face of the grinding wheel with a rectilinear movement towards and away from said rotating carrierwhile the grinding wheel is in contact with h the work-piece or with the wheel truing or' forming device, the rotational ,movement of the carrier and the rectilinear movement of said slide being both derived from a commonshaft.

3. A grinding machine for the purposes described comprising a fixed frame, a rotatable grinding wheel, a head therefor rotatably mounted in said frame about anLaxis at an angle to the rotational axis of said wheel, a slide movable relatively to said frame, a carrier adapted to hold a work-piece or a wheel forming or truing device,

, said carrier being mounted'on said slide, and

means for moving said slide towards and away from the axis-of said wheel with a rectilinear movement while the wheel is in contact with the work-piece with the wheel forming or truing device, the rotational movement of the grinding wheel head and the rectilinear movement of the slide being both derived from a common shaft.

4. A grinding machine for the. purposes described comprising a fixed frame, a slide movable along said frame, a'second slide movable upon and transversely to said first slide, a grinding wheel head carried by said second slide, agrinding wheel rotatably mounted in said head, a lead screw for moving said first slide, a cam rotatably mounted on said first slide for reciprocating said second slide, a carrier normally stationary on said frame and adapated to hold a work-piece or a wheel forming or truing device, and means for simultaneously operating said cam and lead screw to give the grinding wheel head a compound movement relatively to said stationary carrier while the rotating grinding wheel is in contact with the work-piece or with the wheel forming or truing device.

5. A grinding machine for the purposes described comprising a fixed frame, a slide movable thereon, a grinding wheel head carried by said slide, a grinding wheel rotatably mounted in said head, a second slide movable on said frame in a direction transverse to the movement of the first slide and adapted to carry a work-piece or a wheel forming or truing device, a lead screw for moving said first slide, a cam rotatably mounted on the frame for moving said second slide, and means for simultaneously operating said cam and lead screw to cause relative movement between the grinding wheel head and the second slide while the grinding wheel is in contact with the work-piece or with the wheel forming or truing device.

6. Grinding machinesfor the purposesdescribecl according to claim 5 in which the cam operating the second slide is carried by an extension of the lead screw.

7. A grinding machine for the purposes described comprising a fixed frame, a slide movable in relation thereto, a grinding wheel head carried by said slide, a grinding wheel rotatably mounted in said head, a carrier rotatably mounted in said frame and adapted to hold a work-piece or wheel forming or truing device, a cam rotatably mounted in said frame for moving said slide, a shaft rotatably mounted in said frame for rotating said carrier and means common to both said cam and said shaft to cause relative movement between the wheel head and carrier while the grinding wheel is in contact with the work-piece or with the wheel forming or truing device.

STANLEY JAFFA HARLEY.

Images