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Патент USA US2112679

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March 29, 1938.
A. RICKENMANN ET AL
2,112,679
MEANS FOR DRESSING GRINDING DISKS
« Filed Jari.'v 6, 1936
10.9
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3 Sheets-Sheet 1
v‘March 29, 1938.
A. RICKENMANN ET Al.
2,112,679
MEANS FOR DRESSING GRINDING DI'SKS
_ Filed Jari.y 6„ 1936
5 sheets-Sheet 2
www
March 29, 1938. A
A. RlcKENMANN Er A1. y
MEANS FOR DRESSING GRINDING DISKS-
Filed Ja'n. 6, 1936
2,112,679
ì
3 Sheets-Sheet 3
1759.@
33343
amwnuá
_ 2,112,679
Patented Mar; 29, 1938
UNITED. STATES PATENT. OFFICE
_
-2,112,679
MEANS 'Foa DnEssrNG Gnmnmc DisksRickenmann I. and Eugen Kreis,- Zurich,
Switzerland, assignors to Reishauer-Werk
:enge Aktiengesellschaft, Zurich, switzerland
Application January» 6, 1936, Serial No.- 57,812
_
(o1. 12s-_11)
6 Claims.
be understood that the4 grinding is effected by
means of groove-shaped grinding devices which
The present invention relates to a new and lm--
.proved device for trueing proilled grinding wheels
are selected somewhat wider than the amount o_f
having' a plurality of annular grooves employed
the width of the workpiece.
to produce a screw thread upon a workpiece,_say
5 taps, stock dies and so on.
‘
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The profiling of the-disks is effected by rolling 5
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thgfgl‘gñles/byfmeans ofn pressure' rollers $2 at ‘ a
The _invention relates more particularly to a
profiled rotary tool which has ,the conversepro
'considerably reduced disk speed. -The roller is
given -the very >best dimensions and speed'to at
tain the’ best results with a minimum of outlay
for material which, owing to the kind of work to 10
be performed, has Ato be of very good quality.
ñle of that of the grinding wheelin the form of
one or more cylindrical screw threads and which
tool is 'in engagement with the driving grinding
' wheeland returns after each complete revolution
'I'he values suitable are all within very -_ narrow
by an axial displacement to its initial position. limits. In finding the value it has to be con
It has been proposed' to eiiect the axial _dis
placement of the trueing roller by means of cams 'Sidered‘z
' The diameter ofïthe roller cannot be less than
15 corresponding with the screw pitch, bearing
the diameter of the pinions by which the rotary
against one anotherl over their cam surfaces of tool is journalled to obviate vibrations. On the
which cam one is ñxedly connected to a stationary other hand the diameter has to be kept as small
part and the otherrotates with the roller, the _ as possible to reduce the cost, the material-neces
roller being provided with a segmental recess at .sary being of a very high quality and very’ex- 20
the point'of its periphery which
If the cost price of the l_roller exceeds
.2.0 tact with the'grinding wheel at the time the axial pensive.
.a certaimupper limit, the whole method oi true-l
return movement is. to take place. _ The seg
ing the grinding wheels will n_ot be economical.
mental recess _allows the Aaxial displacement of The diameter of the roller is lof* great importance
the roller relatively to the grinding wheels.
_
The mainßhléçt'of the inventionv is to provide
- reliable means to ensure the uninterrupted rota
too. In the method of trueing the grinding g5
wheels referred to, the roller is driven by the
grinding wheel and the roller is displaced in axial
direction by a coiled spring while the grinding
tion of the ~roller while the axial displacement
takes place, that-is, while- the grinding wheel and _ wheel is out of contact with the roller. _. 'I’he time
the rollerv are temporarily out oi driving engage _ in which this displacement can be performed de- ~30
pends on the speed at which the roller runs;
30
A further object is the provision of va roller of there is normally very little time. The time for
a type aforesaid which is continuously rotated shifting the roller, moreover, depends on the
_without the aid'of auxiliary means.
1
breath of the segmental recess or gap of the
Other objects of the invention will in part be rollers Tnis size cannot exceed a certain limit if 35
obvious and in part be pointed out hereinafter.
good Work is to be performed by the roller. '
_
To, the attainment of theaforesaidobjects and ` The desired result is te be attained only if
ends the invention Astill further vresides in the ' all the said values are found so that at a vcertain
-novel details of construction, combination and speed the inertia of the roller is suiîñcient to keep
arrangement of parts, all of which will be first the roller in- rotation while its recess passes over y40
~ment.
40
‘n
_
-Y
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fully described in' the following detailed> descrip
the periphery of the grinding wheels. The _best
tion, and thenbe particularly pointed out in the- results are to be obtained by a peripheral speed
appended__claìms,V reference being had to the ac- __ of the roller of 0.4 to 0.9 meter per minute.4 At
segmental recess
of such a speedthe angle of the
Fig. l is a vertical'section on the line
is to be _58 to 67 degrees. 'I'he diameter of the 45"
g.
2.
.
.'
Fl
roller is b_est not less than 75 and not more than
Fig. 2 is a horizontal section on the line 2--_2 oi' 85 millimeters. The diameter of the lroller may
companying drawings, in which:
Fig. 1.
.'
>
Fig. 3 is -an
`of1ï‘ig.2.
~
"
»
below-the said minimum if by auxiliary means
enlarged detail view of a portion be
the mass, and therefore the inertia, of the roller
y
,_,
_
_
. Fig. 4 is a further enlargement or a portion of
Fig. 3 showing theslee'ves provided with grooves.
Fig. 5 is a detail section and part elevation of
the invention. f
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In the drawings, in which like numerals of ref
erence indicate like parts in all the ilgures, it will
is increasedI . for instance, by attaching some 50
heavy metal. body of lead, or so on, to the roller.
Aroller' having the dimensions as >aforesaid
>and running at the speed mentioned will have
suñlcient inertia _to rotate without an apprecia-_
ble loss in speed while its' drive by the Srindinß '5,3
:1,112,679v
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wheel is interrupted. ` If a loss in speed. would l drel 95 carries a sleeve |29.. The latter is ilxedly
occur the roller would have to beaccelerated by '
the grinding wheel when engaging` the roller
_again-Ã The difference in the circumferential
speed vleads to a very lrapid wear of the proñled
part of the roller. If, on the other hand, the cir
connected with the core'andshows' the cam |95
which vis intendedto cooperate with they com-~ .
panion cam |99 of the sleeve |25 through the in- -
teraction ofthe balls |29. ¿The sleeve and the'LsA
supporting4 ring |_9| are carried by the slee've_99.
cumferential" of ythe roller is in excess'of that of _ This sleeve 99 again rests on the-balls 99.
- the grinding wheel, a larger gap or recess would’ pressure rouer s2 1s1oeated within- the'sieeve 172s
have to be made, or else a spring will be necessary
10
whlchjwould be strong enough to perform the.
axial displacement of the roller in the very short
est time to obviate an impact of the roller on the
profiled part of the grinding wheel. 'I'he use of
a strong spring increases the friction of the _cams
and the wear thereof so that th'e accuracy de-_
creases rapidly.
».
_.
'
T_he pressure rollers 92 are not provided .with
closed profile grooves but are constructed asl sin
-
andthe ring |99.4 .'I'he b'ush' |_9|, the-.pressure
roller 92 and the sleeve |25 are ñxedly securedlo.
on the sleeve 99 by 4means of the nut -|99 _and «
the spacer sleeve |92. A wedge | 29 is located be-> ' ,
tween ~the 'roller 92 and the sleeve |25. Owing _ -
to this arrangement, >the recess»|9'|, Fig. S-,and'
the cam |99 will continuously remain in the same l5 _
relative position. At the free end ofthe' core or
mandrel 95 a threaded portion .| 21'is'located ca_r- _
rying two nuts |29 which exert pressure against
gie screw threads, according to the desired proflle. - sleeve 99 by urging' the spring _|94 against said .
sleeve, the .pressure being exerted through the 2il’
each revolution an axial movement correspond
ball
bearing |29 andanother slëëve-|99._`.^In°tlìis
ing with the size of the pitch.
'
'
manner-_the c'am. |99 of sleeve |25 4is pressed Y
'I'he slide |99 carries a crank shaft |99x geared against the balls |24. Now, while the mandrel
'20 The pressure roller must therefore carry out at
to a shaft Ill'x, as at |||Y, 'the shaft |||x having x‘ 95, the sleeve |2|- and the nuts |29 are'station
the toothed wheel ||| which meshes with a rack _ ary, all of the other elements are rotatable- and 25
|| |z heldin a groove in the support v99 by a screw will rotate whenever the; rotary _grinding disk .69
.asshown in Fig. 1.
_
f
Ais pressed againstthe''roller-92.A .
'I‘he rolling device is locat?edatîtheréafr pfsthe-m-. _Q In order to make sure that‘the-balls' |29~ Vduring
machine. By a slide 99 the "roller can be set -rötìïtßn'remain uniformly> spaced 'from each ~
against the disk. 'I‘he support .99 carries the man
other, a cage |99' is mounted on the sleeve |29, so
drel 95 on which the actual rolling device runs. f and this 'cage is provided 'on its-inner -face with.
' By means 'of-the screw 99 the mandrel 95 is grooves ‘|92. _A. portion of each'ball .projects into _ '
brought parallel to the disk axis and the support each groove. _
_ .
.
is clamped ñrmly by means of the nut >91. ' The
35 bush 99 runs on balls 99 on the' mandrel 9_5. The
Since. the grinding disk 59 is'provided with'
grooves which are closed grooves, and-since the „u
pressure -roller itself' is firmly clamped >4on the ~pressure roller 92 ¿has va _corresponding screw' '
_ bush |92, by means of the cap nut |99. By means thread, it isjobyieuslthat tmsfrener n must bel
of the spring |99 the whole is pressed against . displaced..v in the direction of the arrow' I, _the
the counter cam |95 which is seated firmly on
40 the mandrel 95. In order that the cam can move
’ easily on the counter curve, balls are interposed
which are held by the cage |99. When the pres-Á
sure roller is pressed against the'- slowly'rotating
disk then _the disk causes the roller to' rotate.
By pressing against the cam the roller has simul
taneously imparted ‘ thereto4 an axial movement
which _corresponds with the pitch of the cam and
stretch of the displacement during- each revolu
tion corresponding tothescrew pitch. Upon'the._
termination of a'revolution, however, the pres- ~
sureroller `must now'be "shifted back to the same
extent. I_‘br this purpose thecurves. |99 and |95- .
are‘shown.v The interposed balls |29 serve fox-- ‘»
reducing the friction as in an ordinary ball bear- '
ing. Prom Fig. 4 it is apparent that the 'pressure
92 upon rotation of _the'sleeve |25 in direc-.
of the roller. When the roller has nearly made' tion of arrow 1I is `displaced in direction -of the
a revolution it must again be returned. For this ' .arrow I owing tothe inclined position of the cams
purpose _the roller is provided with a recess |91.' ._|99, |99. AA' short time before the revolution is~ “
>The position of this recess relatively to the disk completed; the4 inclined surface |99 'o_f _the -cam
is identical with the position ofthe cam to' the
counter cam .as regards the axial return move_-.
' ment. When producing the pressure rollers or
D0int of the'cam |95. The result is that due to '
the action' of the spring |90, the parts |25. 92,
vcalm it is therefore always necessary to consider 'IIL |92, |99 and 99 are displaced in a'dlrectiòn
the positions of 'thecamtrackto theeambe. opposite -the direction of the arrow I a distance :l:
"ginningandtothereemoftherclleraccording
which is-equal to the pitch of the screw thread.
_to a separate table. Thelmandrel 9| is- clamped This displacement is eifectedby the pressure roll in the rolling 'support by -a clamping screw. VThe ï 92. In order to make this possible, _this'pressure
axial movement of
for the purpose -roll must not. be in 'engagement with _the grind- 0°
of adjustment in lle-rolled disksis effected by ing darn at this instant. rm- tms purposel the
_means of the .screw |99. When using ne`w` disks roll.92 has a recess |91_ whichmakes it possible '
fortheilrsttimeerwhenil,newproille'istobeY that the above mentioned elements 'can be-dis-rolled in _al disk the disk‘mustbe turned tocyf placed. .With each'revohxtion of the pressure' roll, ‘
lindrical shape. l'lor 'this purpose there is pro
therefore, the advance' movement inthe direc# ß
vided'on' the rolling support a small- lslide |99 tion of the arrow I, asdescribed abovegand -as '
which carries a diamond ||9 and which can be c'ondiüoned by the cams.|_99, |99 is
this'
4xnovedpastthledisklvymeansoftlietoothed
wheel
||f|.
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.
.
continuous advance movement of the pressure roll
being of a value equal to the p_itch and sudden
jerk-like return movement then takes place owing 70
70 -' The core or mandrel 95 is mounted within the
supporting part 99 so as not to be rotatable -there-` to' the inclined surface l“, and-to the same ex- "
in. The core or mandrel 99 has a -portion of tent. - The increase or distance x, therefore, must
` reduced diameter at |29, and on this portion there
is mounted the sleeve _|2| ’which supports the
balls 99. An extension |22 of the core or man
always be in agreement >with the pitch of 'thescrew thread on the-pressure roll.
The slide u n_mevea beek -and rortnby mean. 'ß
3
aimera
of a hand wheel and screw device 24 swivelling
rapidly axially in the opposite direction during
in a bearing 24! on slide 93 and threaded into a> .the remainder of said revolution to return the
relatively stationary lug 241' ' on a part of the
roller to its -initial operative position, and means _
machine.
operatively disconnect said roller from contact
,
What I claim asl my invention is:
,
ì
1. A grinding disk rotating on its aids, a rotat
with said grinding' disk during said return moved
ment.
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5. A‘rotatable’grinding disk having a grooved .
periphery to provide grinding edges,'a pressure
tion, means by virtue of which said. roller may roller having in its periphery the negative grooves
10 be brought into operative contact with said grind
and edges to those of said disk, .a slide adapted _to
ing disk to be rotated thereby, means to move said be movable toward and from said grinding disk,
roller axially in one direction-during a part of a\ a support pivotally adjustably mounted on said
able pressure roller having a peripherallygrooved
cutting surface provided with an interrupted por
15
revolution thereof, and means to return said- roller
slide, means for mounting said roller >in said
to its initial operative positionduring the re
support, means to- adjust said support. to bring '
the axisl of saidy roller into parallelism with the
.
_
2. A grinding disk rotating on its axis, aroj axis of said'gri'nding disk, said roller being driven
-tatable pressure roller having a _peripherally
to rotate by contact with said grinding disk,
grooved cutting surface provided> with an inter- « means by which said roller may be moved axially '
mainder of the revolution. .
rupted portion, means by virtue -of which said - in onevdirection relatively slowly during a- portion
20 roller may be brought into operative contact with A of the revolution of the roller and moved rela
said grinding disk to be rotated thereby, and
tively rapidly axially- in the opposite direction
means to move said roller slowly in one direction
during. the-remainder of said revolution to return
the roller fto its initial operative position, and
along its axisduring the greater part of a revolu
tionI of the roller and to return the roller rapidly? means operatively _to disconnect said roller from ._
25 to its initial operative position along the axis dur
contact with saidgrinding disk during said. re- '
ing the remainder of_ said revolution.
'_-turn movement, said .last-named means residing .
3. A grinding disk rotating on’its axis,V a rotat.
in la> recess formed in the periphery of_ said roller
able pressure roller having a peripherally grooved and extending the length thereof. ,
.
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I
cutting surface provided with an interrupted-por- 6. A rotatable grinding disk having a grooved
30 tion, means by virtue of which said roller may be i periphery 'to provide ‘grinding'edgea a pressure
brought into operative contact with said grinding roller having in its periphery the~ negative grooves
disk to be'rotated thereby, and means to move -and _edges to those of said disk, a slide adapted to
said roller slowly in one-direction along its- -axis _ be movable toward and from said grinding disk, a 1v
during the greater part of a revolution of the support pivotally adjustably mounted on said
roller and to return the roller rapidlyto its initial
slide, means for mounting' said roller in said sup-_ 35
voperative position along the axis durin'gthe're- ~ pom-means to adjust said support to bring the,
mainder of said revolution, said last-»named
v means comprising a cam device and a ret
spring acting on said roller,
40
4. A rotatable grinding disk having a grooved
periphery to provide grinding edges, a pressure
axisof said roller into parallelism with the axis
of said grinding disk, said roller being-driven
to rotate by contact with said grinding disk, -
means by which said roller may be moved axially
in one direction relatively slowly during a portion l -
roller having in its periphery the negative grooves . of. the revolution of the roller and moved relative
and edges to -those of said disk, a slide adapted to 1y rapidly axially in the opposite direction during
45
be movable toward and from said grinding disk,
the remainder of said revolution to return the -
a support pivotally adjustably mounted on .said
slide, means for mounting said roller in'said sup
eratively to disconnect saidroller from contact
rollerito its initial operative position, means op
port, means to adjust said support to b'rlng the
with said grinding disk during said return move
axis of said -roller into parallelism with the axis
of said grinding disk, said roller being driven >to
rotate by contact with said grinding disk, means
by which said roller may be moved vaxially in one
nient, said roller mounting means- including a
direction relatively slowly during a portion of_ the
revolution of the roller 'and moved relatively
mandrel on which the roller is carried, and means
toadjust the mandrel axially to accommodate
' pre-rolled grinding
disks.
.
ALFRED RICKENMANN.`
EUGEN KREIS.-
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50
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