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Патент USA US2411972

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Dec. 3, 1946.
2,411,972
W. MELIN
CENTERLESS' GRINDING MACHINE
Filed March l0, 1945
@ß
2 Sheets-Sheet 1
4
Gîtorneg
Dec. 3, 1946.
,-w. MELIN.
y
CENTERLESS GRINDING MACHINE
Filed March' lO, 1945
2,411,972
-2 Sheets-Sheet 2
Snventor
Pîatented
3,
2,411,972
» UNITED STATE s
PATENT OFFICE
2.411.912
' ~ cENTanLns's
William Melin,Gammo
Grand Rapids, Mich.
application mmh 1o, ms, serial No. 582,029
8 Claims. (Cl. 51-95)
l
2
The present invention relates to grinding ma
_A Another object of the invention is to provide
a grinding machine of the above-mentioned type
in which the work roll is tilted or slightly oanted
so as to prevent the removal of the rotary cut
chines, and more particularhr to a machine for
grinding and ñnishing rotary cutting tools to
their true- circular size.
'
The primary object of the invention is to pro
vide a support for presenting round work to the
grinding wheel of a grinding machine in such
-ting tool while being ground and to eliminate the
' a manner that the work will'be ground to its
Other objects and advantagesof the invention
true circular shape and size with respect to the
will become apparent during the course of the
following description of the invention as shown
center thereof.
`
Another object of the invention is to provide
a device of the above-mentioned type in which
the work is rotated at a speed different than the
speed of the grinding wheel while `*being ground
and finished so that thel peripheral surfaces
thereof will be finished to circular size and shape
more accurately and with a; comparatively high
use of work centers without impalring the ac
curacy of the finished work- piece.
\
in the accompanying drawings, wherein: y
Figure 1 is a top plan view of the grinding and
.finishing machine embodying the invention; i
Figure 2 is a side elevational view of the grind
ving machine showing portions thereof Abroken
away to illustrate various structural details of
the work support;
l
'degree of precision finish and polish.
Another object of the invention is to provide
Figure'3 is an end elevational View of the
grinding machine showing the work and sup
a machine of the type set forth in the preceding 20 porting rolls' thereof so as to properly present
paragraph which is particularly adapted for
grinding and ñnishing the 'relief surfaces of ro
Vtary ‘cutting tools such as end mills and. drills
so that said rotary tool will have all of its periph
the work to the peripheral surface of the grind
ing machine;
.
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Figure 4 is a vertical cross-sectional view
taken on the zig-zag line l-I of Figure 1 and
- eral surfaces spaced equidistant from the center 25 looking „in the direction of the arrows to lllus- '
of the tool and in true concentricity therewith.
trate the motor support and the flexible drive‘fo '
the work roller;
f
Y
- Another object of the invention is to provide
Figure 5 is a vertical cross-sectional view of '
a machine for grinding the relief edges of end »
-the work roll and work supporting rolls to illus
mills and other rotary cutting tools such as twist
drills and reamers in which the support there 30 trate their position and arrangement relative to
for, in addition to supporting and rotating the
one another;
tool relative to the grinding wheel is movable to
feed the rotary cutting tool axially of the periph
eral surface of the grinding wheel and thereby
Figure 6 is a top pla-n_view of a modified grind- v
ing machine structure illustrating a slightly dif
ferent grinding wheel arrangement for grinding
and
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grind and finish said relief edge through the 35 internal diameters of various work pieces.
In the drawings, attention is directed to Fig-4
entire length or pitch of the cutting tool.
Another object of the' invention is to provide
ures 1 to 5 inclusive wherein the referencechar
acter l will generally be employed to designate
a machine tool in which the grinding wheel is
driven by an independent source of power to per
a machine bed or base oi.' a grinding machine '
mit-the grinding wheel to be moved laterally 40 and said vbed consists of- a rectangular casting
toward and away from the work and to provide
the rotary work support-with ‘a separate source
having a top wall B, front and rear walls 1 and`
I l and end walls l connected thereto.> Extend
ing longitudinally of the top wall 6 is a pair yof
spaced guide ribs 9 undercut as at Ill to provide
with respect to the grinding wheel and thereby
grind and finish the lands and cutting portion 45 slide ways for accommodating a slide Ii. The
of the rotary tool without necessitating reset
slide Il is provided with a longitudinal groove I!
ting or shifting of the tool during grinding and
»on the underside thereof for slidably receiving
ilnishing thereof.
said slide ways l `and the walls of said slot I2
y of power so that the support may be fed axially
Another obiect of the invention is to provide ' , are undercut as at Il to mate with the under- ‘
a grinding machine for rotary tools of the above 50 cut portion of the guide ribs 9 and thereby re
tain said, slide in slidable engagement with the
mentioned type in which the work roll may be
bed 5.
`
manually moved away from the supporting rolls
to permit the insertion and removal of the cut
Journaled in a bearing boss formed integrali ting tool after the peripheral edge or land there
with the front wall 1 and top wall I ofthe ma
chine bed or base I is anoperating shaft il hav
of has been ground and ilnished.
»
9,411,972
oted to the enlarged bore Se and is provided at
each side with downwardly extending arms te
which straddle the enlarged boss 56 and receive
the free ends of the shaft lle in openings Bl
ing one end projecting through`tfhe said wall 'I
and fitted with an operating crank l5 secured ,I
thereto as at I6. A handle I1 is formed on the
crank I5 to facilitate rotation of the shaft I4
and the opposite end ofthe shaft is disposed di
therein. An `anchoring pin 82 is passed trans
versely through the downwardly depending ex
tension 60 andthe shaft 58 to prevent endwise
rectly beneath a slot 20 formed in the top wall 8 v
of the machine bed or base _and is provided with
movement of the‘work roller frame 5e relative to
- a gear wheel. 2l keyed or otherwise affixed there
to. Secured to the underside of the slide II and
within the groove 20 therein is -a rack bar 22 heid
the shaft 58. A pairsof spaced upwardly> extend
io
in place by longitudinally spaced anchoring bolts
23. The teeth 24 of the rack bar 22 are‘in mesh
with the teeth on the gear wheel 2l so that rota
ing arms 83 and B4 are formed on the work roller
frame 5e and said arms are bent slightly as indi
cated ln Figure 2 so that the upper end of the
arm $3 as at 85 will be slightly shorter than the
- upper end 68 with the end portions in parallel
tion of the shaft I4 by the crank II` will cause
said gear teeth to drivingly engage said rack and 15, relation-and provided with suitable bores 81 and
68 respectively for receiving ball bearing' race
feed the slide longitudinally along the machine
members having inner andy outer bearing races
base or bed 5.
' _
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89 and 10 respectively. Anti-friction ball bear
Mounted on the rear wall I8 of the machine
ings 1l are mounted between the inner and outer
>base 5 is a motor and grinding wheel supporting
bracket 25 of angle formation having one of its 20 race members @Band 10 and the inner race mem
ber 68 is provided with a bore'13 for receiving the
extensions bolted as at 26 togthe rear wall I8 of
l ends of a drive shaft 15. Mounted on the ldrive*
the machine base or otherwise fastened in place,
shaft between the ends of the arms l5 and 66 is
while the other extension 21 extends rearwardly
a roller 1B held in place by means of a set
and provides a platform or support for an ad
justable slide ‘28. The platform extension` 21 is 25 screw 11 an'd- said roller is provided with a spaced
annular groove 18 adjacent each end thereof for
provided with >a dove-tailed slot 29 for receiving
receiving resilient work engaging means 19. The
the dove-tailed slide rib 30 on the underside of
' work engaging means 19 are adapted to fit snugly
the adjustable slide 21. An adjusting screw Il
within the groove 18 and may be formed of rub
has one of its ends mounted for rotation in a
bearing plate 32 bolted to the angle bracket 25 30 ber or a similar resilient material. It is noted
thatthe drive shaft .1I is slightly angled to the
by means of bolts or the like as at 34. A thread
horizontal and one end thereof is extended be
ed bore A:<14 is formed in the'slide 2B for receiving ~
the threaded end of the screw shaft 3| so that ro
yond the upwardlyvdirected arm 65 to facilitate
a driving connection therewith.
tation of said shaft as by means of a knurled
The work roller ‘
hand piece 35 affixed on said shaft will feed the 35 frame 59 is provided with a coil spring anchoring
pin e0 over which is fastened one end of a coil
slde 21 forwardly and rearwardly _of the machine
spring 82 while- the opposite end of said spring
base or frame 5._ The screw shaft 3| is provided ls hooked in an eye Il secured to the upstanding '
with an annular lenlarged portion I9 in abutting
arm 46 of _the bracket plate 44.. It will thus be
relationship with the bearing plate 32 to prevent
, endwise movement of the shaft.
`
.
40 seen that the spaced upstanding arms I3 and B4
of the work roller'frame le will be urged toward
Secured to the slide 28 is an electric motor 38
having its base 31 fastened to the slide 21 by '
means of bolts or machine screws 38.- i The arma-
,
.ture shaft 3S of the motor 36 projects a consider
able`distan`ce beyond the motor frameI and said
motor shaft is adapted to rotatably. support a
grinding wheel 40 the hub of which as at 4I is
slidably Vreceived on said armature shaft and held
in place by _means of a retaining nut 4I’._
A‘bracket plate 44- is mounted on the slide Il
and said bracket plate is bolted in place by means
of machine screws or the like as at 45. -Formed
integral with the bracketplate 44.v is anupstand
ing supporting arm 46 and said arm iscut away
as at 41 at one side thereof to provide sufficient
room for the work pieces to be ground.
Mounted in theupper end of the upwardly ex
tending arm 48 >is a pair of' horizontal shafts 4B
secured in place by locking pins 48 and the ends
of said shaftsv48- are reduced as at lll and are fit
ted with inner race members 5I having grooves
for receiving anti-friction balls 52; An outer ‘
ball bearing race member A54 encircles the inner _
the work supporting rollers Bl so as to drivinsly
engage the shank S of an end mill M in position
with the nuted portion of the end mill M pre
sented'to the peripheralsurface of the grinding
wheel 40.
A handle 84 is secured-‘to the work roll `
frame 69 so. thatthe operator may depress the~
lever 84 and rock the work roll supporting frame
le on its pivot pin 5l and -retract- the resilient `
work engaging rings 1e from engagemeniîbwith the
work and thereby permit another piece of work .
to be inserted and similarly removed after grind
ing.- A'work engaging stop is>` provided for the
shank S of the end mill and includes a bracket
arm 85 having a' base as at le bolted to the slide
Il by means oLmachine screws or the like as
at el.
The upper end el of the bracket arm Il , I
is provided with a transverse bore le for receiving
a work engaging bar el)A which is adlustably held
in place by means of a set screw 9| threaded in an
opening e2 in the free end of the bracketarm Il
so that its inner end engages` and clamps the work
engaging support l90 in place.
-
Abracket-- 92 having a flanged »portion “"isï
ball bearing’race member Il and fitted-on the
outer ball bearing race member 541s a worlr'en-Ä 65 bolted' to the slide Il by means of bolts or the~
like as at 94 and said bracket ve2 extendsupwardly
gaging roller 55. It will thus be seen that the
from the> slide’ Il and` is so disposed as to pro-v
work engaging rollers 56 on each side of the up- videa platform 95 at the upperend. thereof'for
war “.y extending arm 46 and on each end ofthe
supporting an electric motor et. The base 21
spaced shafts l48 are freely rotatable for engag
.ing the work and supportingthe same during- 70 of the electric ._motor is fastened in place by means
grinding.
l
Formed directly -in front of the vertically ex
tending arm,46 is'an enlarged boss 58 having a`
transverse bore 51 through which extends a pivot
of bolts or machine screws 80 having their thread
ed ends anchored in' suitable openings lin the
platform QI. Alsoymounte'd- on the slide II adja
cent one end thereof is a bracket plate 9e having
shaft member 58. A work roller frame 58 is piv 75 a- pair of upstanding arms me and said bracket
8,411,978 „
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n
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-plate l! is fastened to the slide b_y anchoring
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6
to be rotated in opposite directions. The knurled
, bolts |0| extending through thebase'ë“ and into
the top surface of the slide | |-. The upper ends
vof the parallel arms i“ are provided with bearing
bosses Il! in which is iournaledi a rotary shaft
’ hand piece ll is rotated to adjust and position
lthe peripheral grinding surface of the grind
ing wheel 40 to the desired Vlocation with respect
to the work. After the grinding wheel has thus
been adjusted. a. milling cutter M is positioned
between the upper and lower supporting rolls 8l
by retracting the work roll 18 and inserting said
end millv so that by releasing the lever 84 the
|03 in alignment with the work roll drive shaft
15; Mounted on the shaft |03 is a pulley i“
which has its hub Il! disposed between the bear
ing bosses |03 and said pulley is provided with
a pulley groove |06 of V-formation for receiving 10 spring 82 will exert a force on the work roll
a drive belt |01. The V-drive belt II'I is trained
supporting frame il and yieldingly urge said work
over a pulley |08 mounted on the end of the
roll toward the 'shank S of the end mill M so
armature shaft |09 of the electric motor ll so
that the resilient rings 'I9 will have their periph
that rotation of the armature shaft will impart
`eries in driving engagement with said shank as
, rotary motion to the drive shaft ill. A ilex
indicated in Figure 5. After the work piece has
ible tubular coupling memberv Ill has one of its
ends fitted over the work roll drive shaft 'I5 and
held in place by a clamp || I surrounding ~the end
of said' tubular coupling so `as to clampingly
engage the same rand cause said coupling end to
be connected'to the work roll drive shaft 1I. v
The other end of the coupling _I Il is iltted over
the drive shaft |03 and is similarly provided with'
a clamping ring lil >for establishing a drive
connection with the shaft l". It will thus be 25
seen that energization of the motor 98 will cause
the shafts 'Il and |03 as well as the yielding
ring-like elements ‘I0 on the work roll 'I6 to be '
been placed between the work supporting rolls
5l and work roll 1l, the hand crahk I8 is rotated
so as to feed the slide I| to and fro with the
fiuted portion of the end mill M presented to the
grinding wheel I0. Rotation of the work roll 'I6
feeds the shank S of the end mill M into con
tactual engagement with the work stop!! to
thereby prevent the end mili from becoming dis
placed during the grinding operation. After the
end mill has been ground to the required circu
lar size, the lever BI is depressed and the end
ymill removed from between the work support
ing rollers 55.
,
-
rotated so as to impart rotation to the work
As shown in Figure 6, a work piece W isasup
piece while the saine is held against the sup 30 ported between the work supporting rolls Il’r'car
porting roll Il.
A stop plate III is bolted to the rear wall il
of the'machine bed I by means of machine screws
I I l and said stop plate is -provided at its upper
ried by the upper end ofthe bracketfarm II and
said work piece is likewise engagedr by the work
roll ‘Il with the yielding rubber rings thereon~ as
at 'I9 .in driving engagement with a portion of
- end with a boss II'I having -a threaded opening 35 said work piece. When it is intended to grind
for receivingan adjusting screw III. 'I'he ad- ` the internal surface of a piece of work, the grind
.iusting screw may be held in place by a lock nut
ing maohineshown in Figures 1 to 5 may be
easily converted by substituting the slide as at
and a wrench-engaging head I2. formed on the
2l having an extension |30 and grinding wheel
end of the stop screw llt to facilitate adjustment 40 |31 at the end thereof in lieu of the slide 2l,
thereof. The free end of- the adjusting screw
motor 3B and grinding wheel shown and de
III is adapted to engage a stop esurface |2|
scribed in Figures 1 .to 5 inclusive. To transpose
formed on the side wall of the bracket 52 to limit
the grinding machine to the .type shown in Figure
the longitudinal movement of the slide Il and
6 it is simply necessary to rotate the knurled
the endwise feed of the end mill relative to the 45 handpi'ece ll to displace the slide 2l in either
grinding wheel Il. ’ „
case and replace the same with the slide 2! as
Il! threaded thereon and engaging the boss Ill
In' themodifled form of the invention in Figure ’
desired.
,
6,- the grinding machine structure and fixture is
identical to the work support shown in the form
It is to be understood that the forms of the
invention herewith shown and described are to
of the' invention in Figures 1 to 5 inclusive with 50 be taken as preferredembodiments of the inven
the exception that the slide 28 for supporting
tion and that various changes may be made in
the motor 3B is provided with ,an- extension ill
the shape, size and arrangementof parts without formed integral therewith,’with the outer end of '
departing Afrom the spirit of the invention or .the
said extension enlarged as at ISI to provide a
scope of the subioined claims.
bearing boss for a short shaft I 32. The arma 55 What I claim is:
*
„ ture shaft 39 is provided with a pulley |33 over
1. A grinding machine, comprising a base, a
which is trained afdrive belt IM and said belt l
l“ is adapted -to drive a pulley ,Ill mounted on
slide mounted for movement thereon, a grinding `
wheel carried by the hase, work supporting rolls
. one end of the short shaft |82 and thereby ro
mounted on the slide to receive a work piece, a
tate the same. The opposite end of the short 60 work driving roll mounted between the work sup
shaft |32 is threaded for a portion of its length
porting rolls and on'set therefrom, a motor and
and provided with an enlarged portion ISI form
speed-reducing mechanism mounted on the slide,>
ing a collar for engaging and providing a limit
and a ñexible coupling connection between the
ing stop for the grinding wheel |31. A nut III
speed-reducing mechanism and work driving roll, ~
is threaded on the end of the short shaft |32 65 said motor being yieldingly connected to the f
tos'ecúrely _clamp the grinding wheel |51 in place. i work driving rollend said work driving roll be
It is noted that the ‘work roll ‘Il is rotated in ~
the opposite direction to the grinding wheel lll
ing\ provided with resilient work engaging por
tions and disposed with its axis at an angle with
`so that the cutting surface of the tool such as
respect tothe axis of the work supporting rolls.
an end mill. reamer or twist drill being ground 70
2. A centerless grinder, comprising a base, a
' will be given a hlshly polished ßnish to facili'
slide movably mounted on said base, a grindins
tate the passage of chips and prolong the life
wheel supported rearwardly of said base and
ofthe cutting tool.
_ projecting above said slide. a pair of spaced apart
_In operation the motors ß and Il are started
work - supporting rolls mounted verticallyy one
to causethe grinding wheel Il and work rollv ‘Ill
above the other on the slide. a frame Pivotedto
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9,411,072
said slide adjacent said work supporting rolls,> a
work driving roll mounted in the frame for move
ment toward and» away from said work supporting
rolls in an approximately horizontal direction for
gripping a work piece therebetween at three cir
.eumierentiaily spaced points, drive means car
' ried by .the slide for driving said work driving
roll. 'and means for yieldingly urging~ said work
A driving roll toward said work supporting rolls.
8. A centerless grinder, comprising a base, a
slide movably mounted on said base, a grindingv
wheel supported rearwardly o! said base and pro
jecting above said slide. a pair oi spaced apart
at one end o! said work supporting and driving
-rolls for engaging said work piece.
5. A oenterless grinder, comprising a base, a
slide movably mounted on said base, a grinding
wheel supported rearwardly of said base and pro
jecting above said slide, arpair -oi spaced apart
work supporting rolls mounted vertically one
above .the other on the slide, a frame pivoted to
said slide adjacent said work supporting rolls, a
work driving roll mounted in Ithe trame for move
ment Itoward and away from said work support
ing rolls in an approximately horizontal direc
- tion for, slipping a work piece therebetween at
work supporting rolls mounted vertically one »'
three circumierentially spaced points, drive means
at three circumierentia'lly spaced points, drive
ment with said stop.
above theother on the slide, a frame pivotedto 1,5 carried by the slide for driving said work driving
roll, means tor yieldingly urging said work driv
said slide adjacent said worky suppOrting rolls,
ing roll toward said work supporting' rolls, and a
a work driving roll mounted in the frame for
stop adjacent oneend oi said work supporting and
movement toward and away from said' work sup
driving rolls.' said work driving roll being in- ,
porting rolls in an approximately horizontal di- ’
rection for gripping a work piece therebetween 20 clined to feed the end of said work into engage
meins carried by the slide for driving said work ' ‘
'
6. A centerless grinder,'comprising a base, a
slide movably mounted on said base. a grinding
driving roll, and means for yieldingly urging said
wheel supported rearwardly oi! said base and
work driving roll toward saidy work supporting
above said slide, a pair of spaced apart
rolls,` said work driving r'oll being .tilted to the 25 projecting
work supporting rolls mountedI vertically one
horizontal to feed said work against a stop car
above the other on .the slide, a frame pivoted to
.
said slide adjacent said work supporting rolls,
4; A centerless grinder, comprising a base, a
a work driving roll mounted in the frame' for
slide movably mounted on said base, a grinding
wheel supported rearwardly of said base and pro 30 movement toward and away from said work sup- ,
- ried by the slide.
porting rolls in an approximately horizontal di-_
jecting above said slide. a pair oi spaced apart
rection for gripping a work piece therebetween
work supporting rollsA mounted vertically one
at three circumierentially spaced points, drive
above the other on the slide,` a frame pivoted to
means
carried by~ the' slide for driving said work
said slide adjacent said work supporting rolls, a
work driving roll mounted in .the frame for move 35 driving roll, means for yieldingly urging said work
driving roll toward said work supporting rolls,
ment toward and away from said work >support'.
a handle connected to said work driving roll sup
' ing rolls in an approximately horizontal direc#
porting frame to move .the work driving roll away
,tion for gripping' a work piece therebetween at
three '_circumi'erentially spaced points, drive
- -from said work supporting roll, and a stop means
rneansî- carried by the slide for driving said work
driving roll, means tor yieldingly urging said
stop means on the base for limiting sliding move
' -work ¿driving roll toward said work supporting
ß roilsrand» work stop means carried> by the slide
carried by the slide engageable with adjustable
ment or said slide relative .to the base. A
y
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WILLIAM
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