US1814361A - Grinding machinery - Google Patents

Description

July 14, 1931. I c, BQQTH I 1,814,361

GRINDING MACHINERY Filed April 9, 1928 2 Sheets-Sheet 1 CLEMENT Boar,

July 14, 1931. c:. BOOTH GRINDING MACHINERY Filed April 9, 1928 2 Sheets-Sheet 2 CL EMENT Boar/4,

Patented July 1 4, 1931 UNITED STATES CLEMENT BOOTH, OF CINCINNATI, OHIO, ASSIGNOR TO CINCINNATI GRINDERS IN- PATENT OFFICE.

CORPORATED, OF CINCINNATI, OHIO, A CORPORATION OF OHIO GRINDING MACHINERY Application filed April 9,

This invention relates to improvements in grinding machinery and more particularly to what is known as the centerless type of grinding machinery. 51 The principal object of the present invention is the provision of an improved form of such machine particularly adapted for the production of the stem or barrel portion of drills or similar articles in a manner to render the same properly concentric as respects the tool engaging shank thereof.

A further object of the invention is the.

provision of a simple mechanism capable of ready application to present commercial rinders which will adapt same for satisactory production of a second surface on a cylindrical member concentric or co-axial with a first surface or portion already formed thereon to within very fine limits of accuracy.

An additional object of the present invention is the provision of a novel and improved process for' the complete production of drills or like members intended to have co-axial surfaces of revolution which are noncontinuous.

' Other objects and advantages of the present invention should be readily apparent by reference to the following specification taken in conjunction with the accompanying draw-' ings forming a part thereof, and it will be understood that I may make any modifications in the specific structural details hereinafter disclosed within the scope of the appended claims without departing from or exceeding the spirit of the invention.

Figure 1 is a front view of a machine embodying the invention.

Figure 2 is an enlarged view of the work supporting member with bracket and asso-, ciate parts in section.

Figure 3 is a sectional view on the line 3-3 of Figure 2 looking in the direction of the arrows.

Figure 4 is a plan view of the work and fragmentary adjacent portion of the machine, parts of the latter being shown in section.

Figure 5 is a fragmentary sectional view 1928. Serial no. 288,542.

illustrating a further step in the process of f production of a completed article.

Figure 6 is a similar fragmentary view at right angles to Figure -5.

Figure 7 is an enlarged semi-diagrammatic View illustrating the angular relationship between the several effective surfaces of work and positioning members.

In the drawings in which similar characters of reference are employed to denote corresponding parts throughoutthe several views, the numeral 10 designates the bed of a conventional grinder having mounted thereon the housing 11 for the grinding wheel 12 which is rotated at a high grinding rate of speed in the direction of the arrow on the grinding wheel housing. The bed is further formed with ways 13 for slide 14 which in turn is provided with the additional ways 15 for the regulating wheel slide unit 16. This unit bears the regulating wheel 17 rotated at a slow work controlling rate of speed in the direction of the arrow indicated on its housing or guard.

Mounted on the slide 14 is a bracket 18 carrying the work rest blade 19 and the supplemental work rest unit 20. This unit has the upstanding lugs 21 and 22 to which are adjustabl secure the out-board bearing plate 23 or the outer tapered shank portion 24 on the drill or like work piece 25. This member 23 is preferably formed with an inclined work supporting surface 26 whose angle corresponds substantially to that of the upper face of the workrest blade 19 and is in addition formed with a substantially vertical face 27 inclined at a slight angle or slightly curved to extend substantially parallel with the proximate portion of the regulating wheel. The height of the" member 26 may be varied to properly support the work by suitable adjustment eflz'ected as by loosening of the clamp-bolts 28 engaged in the slots 29 of support member 23. Likewise back and forth adjustment for proper relative positioning of the outer rest asrespects. the work rest blade and regulating wheel may be effected by loosening of bolt 30and manipulation of adjusting screw 31 in threaded engagement with the base portion of the fixture and rotatably associated with the slide 20 but held against axial movement relative thereto as will be readily ap arent by reference to Figure 2.

n the utilization of this portion of the invention the stem or barrel of the drill or work piece 25 is placed in engagement with the upper face of the work rest blade 19 and actuated by gravity against the surface of the regulating wheel 17. The slide 14 bearing the regulating wheel unit 16 and the work rest is then moved inward as by manipulation of pilot wheel 32 or other suitable mechanism pressing the portion of work to be operated upon against the grinding wheel 12.

It will be understood particularly by ref.- erence to Figure 7 that it is necessary to produce on drills a slight clearance angle which is to say that the diameter adjacent the shank is slightly, less than that at the point. This means that there is normally a slightly greater amount of grinding to be performed at the shank end of the work than has to be performed at the point and the particular form of outer work support is therefore particularly desirable in' that the relationship between regulating wheel surface 17 and shank engaging surface 27 is such that undue canting of the work between the wheels is prevented due in spite of their tapered relationship to the resistance offered by the surface 27 to displacement of the shaft. At the same time the angle of surface 27 is such that when irregularities on the drill barrel are engaged b' the regulating wheel tending to lift the wor upward on the work rest to 'a wider portion of the grinding throat the outer end of the work will also be correspondingly lifted. Consequently the work is so terminally supported at a predetermined point on the shank that both vertical tilting or dropping of the outer portion and lateral deflection is prevented without in any @wise interfering with the normal free floating movement of the work between work on the work rest and between grinding and regulating wheels.

Attention is invited to the fact that with this arrangement of parts the outer end of the work piece is supported at two points which positively support this end.v concentric with the portion of the work piece within the grinding throat. From this it must fol-' low, as in the case of drills, that the barrel .of the work piece or drill will run true to its outer or supporting end after such supportin end has been inserted within a holder or spindle. r

In the carrying out of the improved process contemplated by the present invention the drill having been ground as just disclosed as respects its barrel portion is -then reversed and the barrel portion within a suitable sleeve or supporting fixture33 of machine, the rest having a Work engaging a size to just receive the largest diameter of said barrel portion and with the fixture held in a slightly canted position so as to form a line contact with one side of the cylindrical surface just completed. While so held the tapered shank portion is introduced into the throat of a centerless grinder such as is illustrated in Figure 1 between the grinding and regulating wheels, the regulating wheel having a rib portion 34 intended in the finished shank to contact with substantially the same portion of the shank as was previously engaged by the supporting plate 23 while the work rest also has a rib or upwardly projecting portion 35 correspondingly engaging the shank. These parts serve. for final positioning of the tapered shank in the throat in which it is ground. Consequently the process as here disclosed consists in producing concentric barrel and shank portions on twist drills or the like by successively floating the portions of the work to be ground on a work rest and between grinding and regulaitng wheels and employing a constant point on the work for positioning both portions thereof during the successive grinding operations. The specific mechanism for performing the second grinding operation has been here disclosed merely in its broadest sense for purpose of understanding of the process involved inasmuch as the specific structural details of the particular machine form the subject matter of my co-pending application Serial No. 268,543, filed April 9, 1928.

From the foregoing description the improved process of successive concentric production of drills should be readily under-- stood as well as the specific structural details of the machine utilized for performance of the first portion of the process.

I claim. e 1. A machine for the production of substantially cylindrical work pieces including a work rest, a grinding wheel disposed at one side of the work rest and' having its operative face moving at a high grinding rate of speed in the direction of the work rest, a work regulating member disposed on the opposite side of the work rest and having its surface moving in the opposite direction from that of the grinding wheel to control the rate of rotation of a work piece on the surface ascending toward the grin ing wheel, and a steadying member for and overhanging portion of thework having a work engaging surface substantially parallel with that of the work rest and a second surface substantially parallel with that of the regulating member for simultaneous engagement with an overhanging portion of the work to steady the latter during grinding.

2. A machine for the centerless production of work with portions of different diameters including opposed grinding and regulating wheels rming a work receiving throat therebetween, a work rest blade disposed in the throat between the grinding and regulating wheels, and an out-board fixture for support of a portion of the work of different diameter having a supporting surface extending substantiall parallel with that of the work rest but 0 -set an amount equivalent to the difference in radii of the work at the grinding and support engaging portions thereof whereby the out-board support will continuously proplerly engage the overhanging portion of t e work during movement of the: work on the work rest blade.

3. A machine for the centerless production of work with portions of different diameters including opposed grinding and regulating wheels forming a work receiving throat therebetween, a work rest blade disposed in the throat between the grinding and regulating wheels, and an out-board fixture- 0 support of a portion of the work of different.

diameter having a supporting surface extending substantiall parallel with that of the work rest but 0 -set an amount equivalent to the difference in radii of the work 7 at the grinding and support engaging portions thereof, whereby the out-board sup movement of the work on the work 'rest blade, said out-board support having a second portion at the regulating wheel side thereof similarly oif-set as respects the surface of the regulating wheel and substantially parallel therewith to limit the movement of the overhanging portion of the work in the direction of the regulating wheel. 1

4. A machine for the centerless production of work with portions of different diameters including opposed grinding and regulating wheels forming a work receiving throat therebetween, a work' rest blade disposed in the throat between the grinding and regulating wheels,,an out-board fixture for's'upport of a portion of the work of different diameter having a supporting surface extending substantially parallel with that of the work rest but off-set an amount equivalent to the 7 difference in radii of thework at the grinding and support engaging portions thereof whereby the out-board support will continuously properly engage the overhanging portion of the work during movement'of the work on the work rest blade, and means for adjusting the relative height of the work {)Zst blade and said outer supporting mem 5. A machine for thecenterless production of work with portions of different diameters includin opposed grinding and regulating wheels forming a work receiving throat therebetween, a work rest blade disposed in the throat between the grinding and regulating wheels, an out-board fixture for support I of a portion of the work of different diameter having a supporting surface extending substantially parallel with that of the work rest but ofi-set an amount equivalent to the difference in radii of the work at the grinding and support engaging portions thereof, whereby the outboard support will continuously properly engage the overhanging portion of the work during movement of the work on the work'rest blade, said out-board tion of work with portions of different diam-.

eters including opposed grinding and regulating wheels forming a work receiving throat therebetween, a work rest blade disposed in the throat between the grinding and regulating wheels, an out-board fixture for support of a portion of the work of difierent diameter havin a supporting surface extending substantia ly parallel with that of the work rest but off-set an amount equivalent to the difference in radii of the work at the grinding and support engaging portions thereof whereby the out-board support will continuously properly engage the overhanging portion of t e work during movement of the work on the work rest blade, means for ad'usting the relative height of the work rest b ade and said outer supportin member, and means for transversely a justing the out-board work supporting member to insure proper relationship between the regulating wheel surface and the correspond- A machine for the centerless production of work with portions of different diameters.

includin opposed grinding and regulating wheels orming a work receiving throat therebetween, a work rest-blade disposed in the throat between the grinding and regulating wheels, an out-board fixture for support of a portion of the work of different diameter having a supporting surface extending substantially parallel with that of the work rest but off-set an amount equivalent to the difference in radii of the work at the grinding and support engaging portions thereof whereby the out-board support will continuously properly engage the work rest blade means for adjusting the relative height of t the work rest blade and said outer sup rting the out-board work su orting member 1 to insure proper relations 1p between the work engaging surface on the support.-

ing member means for transversely a justregulating wheel surface and the corresponding work engaging surface on the support, and means for vertically ad usting said support to correspondingly position theangular .ing throat and independent of the work rest blade having a supportingsurface extending in a plane parallel with the supporting surface of the work rest blade, and means supporting said blade and outboard support for adjustment one with respect to the other while maintaining said parallel relationship of their surfaces.

9. In a centerless grinder the combination of a pair of opposed grinding and regulating wheels having their proximate points spaced from one another, a work rest blade below the grinding and regulating ,wheels and with the said wheels forming the three point grinding throat for the work, an outboard guide and supporting member haw'ng a portion contacting the work at a point in a plane parallel with the point of contact of the regulating wheel with the work, and means supporting said blade and outboard support for adjustment one with respect to the other while maintaining said parallel relationship of their surfaces.

10. In a centerless grinder the combination of a pair of opposed grinding and regulating wheels having their proximate points spaced from one-another, a work rest blade below the grinding and regulating wheels and with the said wheels forming the three point contact grinding throat for the work, an outboard guide and supporting member for enga ement with the work exterior of the grinding throat having portions contact ing therewith at points parallel with the points of contact of the grinding throat, and means'for adjusting theoperative position of the outboard'support relative to the grinding throat while maintaining said parallel relationship between the points of contact of said outboard support and grinding throat. Y

11. In a centerless grinder the combination with a bed, of a pair of opposed grinding and regulating wheels carried thereby and forming a grinding throat therebetween, a bracket carried by the bed beneath the grinding throat, a work rest blade supported by the bracket for peripheral engagement with a work piece, an outboard support ex tending from the bracket and including a carrier, an outboard work rest on the carrier having supporting portions for engagement with the work at points parallel with the points of contact between-the work and the work rest whereby to support the'outer end of the work concentric with the portion within the grinding throat, and means for adjusting the carrier relative to the bracket to vary the operative position thereof while maintainingthe parallel relationship of the points of contact of the several work rest members.

12. In a centerless grinder the combination with a bed, of apair of opposed grinding and regulating wheels carried thereby and forming a grinding throat therebetween, a bracket carried by the bed beneath the grinding throat, a work rest blade supported by the bracket for peripheral engagement' with a work piece, an outboard support extending from the bracket and including a carrier, an outboard work rest on the carrier having supporting por-- tions for engagement with the work at points parallel with the points of contact between the work and the work rest whereby to support the outer end of the work concentric with the portion within the grinding throat, means for adjusting the carrier relative to the bracket-to vary the operative position thereof while maintaining the parallel relationship of the points of contact of the several work rest members, and means for locking the carrier in its adjusted positions.

13. In a centerless grinder the combination of a bed, a pair of opposed grinding and regulating wheels having their proximate surfaces spaced from one another to form a grinding throat, a slide for one of the wheels for actuating said wheel toward and from the remaining wheel, a supporting block carried by the slide beneath the grinding throat, a work rest blade having a supporting surface carried by the block'for peripherally supporting a work piece during grinding, a carrier member adjustably supported by the block, an outboard work rest member supported by the carrier and having a portion for contacting the work at a point parallel with the supporting surface of the blade to hold the work remote from the grinding throat concentric with the portion of the work within the grinding throat, and means for adjusting the outboard work rest member relative to the carrier to vertically adjust the work rest blade and work rest member relative to one another and to laterally adjust the carrier relative to the supporting block to laterally adjust the work rest blade and work rest member relative to one another all while maintaining the parallel relationship of the points of contact of said work rest blade and work rest member.

14. In a centerles's grinder the combination of a bed, a air of opposed grinding and regulating w eels having their proximate surfaces spaced from one another to form a grinding throat, a slide for one of the wheels for actuating a supporting block .carried' by, the slide beneath the grinding throat, a Work rest blade having a supporting surface carried by the block for peripherally supporting a work piece during grinding, a carrier member adjustably supported by the block, an outboard work rest member supported by the carrier and having a portion or contacting the work at a point parallel with the supporting surface of the blade to hold the work remote from the grinding throat concentric with the portion of the work Within the grinding throat, means for adj justing the outboard work rest member relative to the carrier tovertically adjustthe work rest blade and work rest member relative to one another and to laterally adjust the carrier relative to the supporting block to laterally adjust the work rest blade and work rest member relative to one another all while maintaining the parallel relationship of the points of contact of said work rest blade and work rest member, and means for locking the outboard work rest andcarrier in their adjusted positions. a In testimony whereof I aflix my signature.

l CLEMENT BOOTH.

said wheel (I toward and from the remaining wheel,

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