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Oct 15, 1946.
A. R. SPICACCI
2,409,320
GRINDING ‘OF ROLLERS
Filed March 50', 1944
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Patented Oct. 15, ‘1946
2,409,320
_ UNITED STATES“ ‘PATE‘N T ‘OFFICE
2,409,320
‘f
.
‘
‘ GRINDING OF ROLLERS ,
‘Attilio R. Spicacci, Bristol, 7001111., assignor ‘to Gen- ‘
eral Motors Corporation, Detroit,‘ Mich., a cor
poration of Delaware
Application March‘30, 1944,‘ Serial No. 528,713
16 Claims.
‘(or 514-103)
1
and an opposed regulating Wheel R provided with
a convexperipheral surface 8,‘ the two surfaces
‘ ers, especially antifriction bearing rollers that are .
longitudinally pro?led and have their peripheral
portions formed as surfaces of revolution. An
being, equidistant at their points of nearest ap
proach and providing an arcuate ‘throat through
object of the invention is to provide an improved
; which the work is urged’endwise by a slight skew
method and an improved apparatus for produc
ing of the ‘regulating wheel.‘
ing such pro?led rollers with special reference
to reducing the cost. Another object is‘ to pro
vide an improved method of producing rollers
In the grinding throat is a blade It which is
curved to follow the curveof the wheels. The up
per ‘concave‘work supporting surface I21 of the
curved blade is steeply inclined and is extended
‘ that are longitudinally concave along the middle
portions of their lengths and have their end por
,
'
2
This invention relates to the grinding of roll
tions tapered.
'
upwardly very close to the grinding wheel. When
‘
i the roller is between the wheels, the central c'on
' To these ends and also to improve generally
cave portion 2 conforms to‘the regulating'wheel
and the end portions 4 engage the grinding wheel
and are convexly ground. The roller is supported
upon apparatus and methods of this character,
the invention consists in the various matters
hereinafter described and claimed. In its broader
on the concave blade ‘surface [2 by its two con
vex end portions 4 which have substantially ar
aspects, the invention is ‘not‘necessarily limited
to the speci?c apparatus and steps ‘selected for
illustrative purposes in the accompanying draw
ing in which
Fig. 1 is a plan view of one apparatus showing
cuate lines of contact with the blade surface 12
as best shown in Fig. 3. The arcuate lines of
support exist because the surface l2 on the' curved
_ bladeis extended so close to the wheel surface
the ?rst grinding step.
'
'
that it has nearly the same concave contour as
Fig. 2 is a central cross section of Fig. 1 except .
the wheel and is substantially 'a cylindrical sur
that the convex wheel is in side elevation.
‘ face of revolution. Suitable entrance guides I4
Fig. 3 is a section of the blade and roller on the .25 are provided to lead the roller into thegrinding
line 3--3 of Fig. 2, enlarged.
‘ throat _. and suitable exit guides I 6 to ‘lead the
Fig. 4 is a plan-View of an apparatus used in ' rollers out.
the ?nal grinding step.
i
Fig. 5 is a central cross section of Fig. 4 except
the convex wheel is in side elevation.
Fig. 6 is a section of the blade and roller on
the line 6—-—6 of Fig. 5, enlarged. '
After, the rollers have had one or more passes
30
through the grinding throat to produce accurate
convex end portions 4,‘ they are passed one or
more times through a second centerless grinder
to‘ grind the concave portions 2 as indicated in
Fig. 7 is a diagram showing the relation of the _ Figs. 4', 5 and 6. ‘In these ?gures, the grinding
roller curves.
'
'
wheellGl has a convex peripheral surface l8 and
Figs. 8 and 9 are Views similar to portions of 35 the regulating wheel Rl has a concave peripheral
Figs. 4 and 1 indicating a modi?cation of the
‘ surface 20 equidistant therefrom at thel‘grinding
process steps.
'
‘
‘throat; A curved blade 22 with an inclined top
Fig. 7 shows one of the rollers to be produced,
surface “24. extended ‘close to the grinding’wheel
the greater portion 2 of its periphery being a con
supports the roller by contact with the concave
cave surface of revolution generated by revolving 40 surface 2.‘ As best shown in Fig. 6, this is sub
a circular are about the rolleraxis and the ends 4
stantially an arcuate line of contact along the
being short convex‘ surfaces of revolution, the
‘entire-surface Zbec'ause the blade surface where
centers of all generating arcs being at the same
point P. ‘ The portions dare in effect short‘ tapers
or chamfers and are not only bene?cialin‘break
ing what would otherwise be sharp corners but
they have an important advantage in the process
~ of production. The roller will ordinarily be ?rst
i'oughly'shaped as by dies in a heading machine
to ‘approximately the desired form and ‘then ‘
ground to accurate size and shape in a series of
steps.
The step following the heading is the
grinding of the convexly curved ends in a cen~
terless grinding machine having a grinding wheel
G provided with a concave ‘peripheral surface 6
it-l‘engages the surface 2' is near the grinding
wheel and has very nearly the same convex con
ytour as the grinding wheel. The work supporting
surface is, substantially a cylindrical surface of
revo1ution.;The regulating wheel R] conforms
totheaccuratelyground end portions 4 at‘two
vspaceddocations and‘ controlsrotation of the
rollers, These convex and} portions are not only
useful in providing good supports for the roller
against the regulating wheel but they are bene
?cial in breaking the corners of the rollers
which would‘otherwise be .sharp- and dig into
the wheel or into the antifriction bearing raceway
2,409,320
3
4
ing wheel and an opposed regulating wheel, one
of the wheels having a convex pro?le to conform
to the concave pro?le of the rolls and the other
in use. Suitable entrance guides and exit guides
are provided. The rollers are passed through the
second centerless grinder one or more times as
wheel having a concave pro?le to conform to the
engage raceways in practice. In the ?rst pass 5 convex end portions of the rolls, and a work sup
port close up to the grinding wheel and having
through the second grinder, the rollers may be
required to produce the accurate surfaces-2 which
guided thereto directly from the ,exitnside of_ the
?rst ‘grinder.
- .itswork supporting surface. formed as a surface
. of revolution having: substantially the same pro
.
Figs. 8 and 9 show a modi?cation of the process.
The rollers are similar to those in the preceding
?gures but the convex end portions 4A are much
?le as the grinding wheel.
6. The method of producing rolls, which con
sists in ?rst forming a roll having its middle por
tion of concave pro?le and its end portions ta
longer in proportion to the length oftheloll and
constitute surfaces adapted to engage the race
way of a bearing ring. After theroughirolls-are
_ peredgand passing the formed roll into a center
"JBSS; grinder to ,grind the tapered end portions
shaped as in a heading machine, the concave cen- 15.i'rwhilegsupporting the roll for controlled rotation
.
tral portions 2A are ground against a convex
grinding wheel G2 as indicated in Fig. v8,.agblade
:
byits concavepro?le.
' 7;" The method of producing rolls, which con
_;,;_ sistsin ?rst forming a roll having a central con
support similar to the surface 24'in_Figs. ‘Land 5
being used and the convex end portions 4A engag
cave pro?le and tapered end portions, and pass
,_ing .a concave "regulating wheel R2. Then the 20:._ing. the formed roll into a, centerless grinder to
Y jrolls are passed through a second centerless
_, jgrinder as in Fig. 9 to grind the convex end'por
,..grind_ thetapered, endportions while utilizing
. eboththeconcave pro?le .and the tapered .end por
gtions 4A against a concave grinding wheel G3, a
tions to support therollfor rotation.
1; blade support similar to that in Figs. 1 and 2 being
~ 8. The method of producing rolls, which, con
used and the concave; portion-2A of the roll en I)?’
“0 sists in ?rst forming a roll having a central con
gaging a convex regulating wheel R3.
cave pro?le and tapered end portions, and pass
Iclaim:
,, ing the formed roll into a centerless grinder to
“middle portions of~longitudinally~concave pro?le
grind the tapered end portions while rotatably
supporting the roll on its concave pro?le opposite
and their end portions convexly curved, a grind
ing wheel having aconcave pro?le adapted to
to the grinding wheel and on its tapered end por
’ . 1. .In apparatus for grinding rolls having their
tions adjacent to the grinding wheel,
9. The methodv of producing rolls, which con
, grindthe convex end portions of the rolls, a regu
lating . wheel ‘having a convex‘ pro?le conforming
sists in ?rst forming-a roll having its middle por
to. the concave pro?le of the rolls to control ro
,-~-tion of concave pro?le and its end portions of
tation, and a work supporting'surface constitut- 30 convex pro?le, and passing the formed roll'into
H ing a surface‘ of revolution having a concave
~ jacenterless grinder to grind one kind of pro?le
‘ pro?le engaging-and substantially conforming to
' the pro?le of the convex end portions.
. while rotatably supporting the roll on the same
kind of. pro?le adjacent to the grinding wheel
2._ In apparatus for grinding rolls having their
0 and on the other kind of pro?le opposite to the
Mfrniddle portions of longitudinally concave pro?le 11 ; grinding wheel.
_ .andrtheir end portions convexly curved, a grind
10. The method of producing rolls having their
..ging'qwheel having a concave pro?le adapted to
middle portions of longitudinally concave pro?le
grindtheconvex end portions of the rolls, a regu
and their end portions tapered, which consists in
Qlating,wheelyhaving a convex pro?le conforming 45 ?rst grinding the tapered end portions, and cen
, to the concave pro?le of the rolls to control rota
tion, and a curved blade having a concave work
supporting surface engaging the pro?le‘v of the
convex end portions adjacent- to the- grinding
terless grinding the concave‘pro?le while sup
. porting the rolls for controlled rotation on the
previously ground endv ‘portions.
,
wheel and having substantially the same’ concave
. curvature as the grindingwheel.
3. In apparatus for grinding rolls having their
,,jmiddle portions of longitudinally concave‘pro?le
v“and their end portions convexly curved,,a grind
a passing the rolls intoa centerless grinder to grind
the concave pro?le while utilizing both. the, ta
Ming j wheel having a convex pro?le adapted to
;pered end portions and the concave pro?le to
support the roll for rotation.
12. The method of producing ~rol1s having
their middle portions of longitudinally concave
~pro?le and their end portions tapered, which
consists in'?rst forming the end portions to con
___,..grind the concave'pro?le of the rolls, aregulating
I
; wheel having aconcave pro?le conforming to the
convex end portions to control rotation‘ of the
rolls, and a work supporting surface having a con
vex pro?le engaging and substantially conform
. ing to the’concave pro?le of the rolls.
‘ vexly curved pro?le; and passing the rolls into a
4. In apparatus for grinding rolls having their
,middle portions of longitudinally concave pro?le
andtheir end portions convexly curved, a grind
I,._ing' wheel having a convex pro?le adapted to
igrindthe concave pro?le of the rolls, a regulat
centerless‘grinder to grind the concave pro?le
while rotatably supporting .the rolls on their ta
pered end portions opposite to the grinding wheel
Ll and’ on‘ their concave pro?le adjacent to the
grinding wheel.
_ _ ing wheel having-a concave pro?le conforming to
‘ 13;‘ The process of producing rolls having their
-~ middle portions of ‘longitudinally concave pro
~~ ?le, which consists in ?rst grinding the end por
“the convex; end portions to control rotation of
_ , , the rolls, and a curved blade having a convex work
., supporting surface, engaging thehconca've pro
tions of the rolls to convexly curved pro?le, and
?le, of the rolls adjacent to the grinding wheel
_ andhaving substantially the same convex- curva
ture as, the grinding wheel.
11. ,Thegmethod of producing rolls having their
middle portions of, longitudinally concave pro?le
and their end portions tapered, which, consists
in ?rst grindingthe ‘tapered end portions, and
then- centerless grinding the concave pro?le by
r
a correspondingly curved grinding wheel while
utilizing the curved end portions to support the
,,,middle portions of. longitudinally concavepro?le ~-rolls- against a regulating wheel which conforms
and their end portions convexly curved, a grind I 5 to the curved end portions.
‘ 5. In apparatus for grinding rolls having their
n
2,409,320
6
'14. The method of producing rolls, which con
porting the roll for rotation by its ground end
portions and its concave pro?le.
sists in ?rst forming a roll having its middle por-‘
tion of concave pro?le and its end portions of
16. The method of producing a roll having a
convex pro?le, passing the roll through a center
central concave pro?le and tapered end portions,
less grinder to grind the convex end portions, and 5 which consists in ?rst passing the roll through a
passing the rolls through a second centerless
centerless grinder to grind the tapered end p01’
grinder to grind the concave pro?le while sup
porting the roll for controlled rotation upon the
ground end portions.
15. The method of producing rolls, which con
sists in ?rst forming a roll having a central con
cave pro?le and tapered end portions, passing
the roll through a centerless grinder to grind the
end portions while supporting the roll for rota
tion by its concave pro?le and by its end portions,
and passing the roll through a second centerless
grinder to grind the concave pro?le while sup
tions While supporting the roll for rotation op
posite to the grinding wheel by its concave pro
?le and adjacent to the wheel by its tapered end
portions, and passing the roll through a second
centerless grinder to grind the concave pro?le
while supporting the roll for rotation opposite to
the grinding Wheel by its tapered end portions,
and supporting the roll adjacent to the wheel
by its concave pro?le.
ATI'ILIO R. SPICACCI.
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