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Патент USA US2133191

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Oét. 11,1938.
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HDANNER
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2,133,191
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DEVICE FOR DRESSING GRINDING WHEELS
Filed Aug. 20, 1937
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2049
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2_Sheets-Sheet l
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Inventor
m
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mm‘? X _
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Oct, 11, 1938.
A
2,133,191
H. DANNER
DEVICE FOR DRESSING GRINDING WHEELS
Filed Aug. 20, 1937
20
21
2 Shegts-Sheet 2
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retested
11,‘ 1938
' 2.133.191
>~ UNITE-D- .STATES :PATEQNTYOFF'ICEI ~
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‘2.133.191
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tga'rt, Germany, assignor
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fabrik Akti0118esellschafasstttlgart‘c
n
-ann-,
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statt,
Application sum 20, 1931, Serial No. 160,183
A
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In Germany April 6, 1936
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12 Claims. ('61. 125-11)
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This inventionqelates to a machine or device
the hydraulic slide drive mechanism during the ,
-for dressing stepped shouldered pro?le grinding
.
constant feeding. operation" of the dressing tool.
wheels, wherein hydraulic drive ‘mechanism is - thus stopping the feeding ‘movement
provided for e?i'ciently operating the machine in
_-_ accordance with the so-called “copying" method.
In dressinggrinding wheels of the shouldered
of said ~ ~
'
dressing tool, in an e?lcient' manner, andthis I
whens, suitably provided guide pin or member,
associated‘ with the dressing tool, reaches a shoal-‘4
der-of the template corresponding to the shoulderv
pro?le type. and by means of a diamond tool
‘while is guided in its operation by means of a on the grinding wheel at the end of the grind- " ;
template, care must be exercized in lowering the 'ing wheel surface‘ just previously dressed.
In this arrangement, the operator sets the de
.h, diamond tool from one-shouldered surface‘ to
theinext lower shouldered surface of the grind~ siredfeed velocity of the diamond tool at the
in'g wheel, and this'in order that said operation beginning of the dressing operation, and ,this
may be accomplished accurately ~and without feed velocity remains . unchanged during the '
shock, thus avoiding damage or injury, to either dressing operation of each shouldered surface,~ _ v
“the dressing tool orthe grinding wheel. For . whereupon .the diamond tool is stopped posi- “v
'
this reason dressing machines -'or‘ devices have tively, with‘certainty and accuracy at the points
heretofore been constructed exclusively for hand' where it is to be reset for the dressing of an
operation, and this-in‘ turn leads to defects in the other shouldered surface. The'operaton has at
accuracy \of the work'produced, 'of which the'> hisdisposal any required amount of time‘ for the
resetting operation, and therefore may devote 2'0 i
‘20 most‘ serious is that the feediof the diamond
. tool over the ‘operating surface of' the grinding
,
the necessary attention thereto.
This dressing _
‘
wheel, (which is usually accomplished by means _ operation maybe continued at the will of the
' >' of a hand operated screw drive), is not of suf-
operator .andby means of a‘ hand controlled le
' ?cient uniformity: and with any degreeeof ex.
ver for the resetting operation, "whereupon the
1
diamond tool again moves» forward; with the 25
25 actness. The reason for this is that the opera
tor; cannot concentrate his attention solely upon
originally selected feeding speed to perform its
‘
dressing operation up to the next shoulder on
the profile or to the end of the pro?le‘ as'the _~
‘maintaining acertain speed offered, and in ad
dition to this, saidoperator must exercise utmost
care at the points where the shoulders are formed
Furthermore, the
’
‘invention requires
.
that
. the ,0
. w in order to alter the position of the diamond tool 1 case'maybe.
at the proper moment, thus resulting in almost means for stopping the hydraulic drive be sov
constructed and arranged that said means shall
unavoidably bringing 'about' a noticeable reduc
tion of the prescribed feed velocity of the tool be capable of altering the speed of the diamond
on approaching‘ these shouldered points, and the ‘tool in its movement in a direction parallel to .
35 proper and uniform setting of the, diamond tool the grinding wheel axis, and this in a positive.“
‘manner and according to a predetermined plan
_
to the new shouldered surface." .
,_
"I
, According to the present invention,'these_ de to suit conditions; This embodiment of the in
ifects are eliminated by feeding the diamond-tool vention is important in the case. of pro?les which
forward by means of a hydraulic drive, which at various points-require the feeding movement
‘so is automatically controlled, by mechanical means ‘ of the diamond tool to be composed of two per- ‘0
pendicular components and, without ‘shouldered
forstopping the feeding movement of said dia
or ‘step jumps, the condition being that the ‘
mond. tool in an effective; manner when it ar
rives'at a predetermined step or shoulder of the, diamond tool shall treat all sections‘of the grind-r ' ’
v
pro?le to. be operated. upon,» and wherein the ing wheel pro?le at the same speed. Accordingly,
dlmechanicalmeansmaybesoadiustedandar at the points where the diamond tool moves at 45'
ranged as to control the operation of the machine an angle'with respect to-the grinding wheel axis,
for use_'in‘ connection with grinding wheels of its speed must be reduced in the direction of said.
varying pro?les.
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I
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‘Theinvention comprises a template for guid
Ming the dressing tool in asscciationwith a endtrolmember~ or-rail for the ‘hydraulic drive of
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This requirement" is dimcult t0 ful?ll, and
cannot-be accomplished in‘ a satisfactory man-" '
nerf by hand operating devices. but with a ma- gq
chine constructed in accordance withethe pres-'
the dressing tool, said control member being con- ‘ ent invention, this problem may be ‘readily .'
‘nected to theslide carrying the dressing tool and solved, whereby further remarkablei.-;jimprove- '
‘effecting in association with other mechanismv the ,ment is achieved over-existing ‘methods.
Iintsrruption‘of the supply of
pressure
an embodiment of the improved'imac'hine or gs
2,188,191;
2 a
drawings
Figure 1wherein:
is a diagrammatic viewof a piece of
work of the type to-be ground by a shouldered
posed perpendicularly with reference to the guide
6-.v For sliding movement within this guide I4 is
mounted the diamond tool holder 2, in which is
disposed in the usual manner, the stock It with
the diamond l'l, said stock l6 being provided with
grinding wheel using the plunge cut method;
and also illustrating in connection therewith the
a member I 5 for line adjustment of ‘said tool.
In the example shown (see Figs. 2 and 4) a self- '
device according to the present invention is illus
trated by way of example in the accompanying
lo
'
type of grinding wheelv which is to be dressed; locking rack and pinion mechanism I8 is provided
Figure 2 is‘a side elevation of the improved ' for the rapid vertical reciprocable movement of
dressing machine;
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the diamond tool holder 2 in the guide 14.
‘As previously mentioned, the diamond tool -is
Figure 3 is a front elevation thereof; and
set‘ and controlled for the dressing of the various
Figure 4 is a‘ top plan view of the dressing ma
/ chine as ‘shown in Fig. 3.
> grinding wheel diameters or surfaces required,
by means of a template i9 which is detachably
secured to the upper front edge of the frame I.
and wherein it is necessary to dress grinding Its freely exposed‘upper surface is an accurate
wheels of the type used for grinding work hav-\ replica of the desired pro?le of the working sur
The embodiment vof this invention is based
15 upon the conditions as illustrated in Figure l,
ing‘a number of shouldered portions, and this by , face of- the grinding wheel, and "serves as a guide
the plunge cut method: In this Fig. 1 disclosure, surface for the guide pin or member 20, which is
paratively'small diameter is joined by a second
carried by an arm 2| extending from the diamond 20
‘tool holder 2. The pin 20 is shouldered as at 20’
cylindrical portion b of slightly larger diameter
on. one side of its free end and with its center
a cylindrical part a of the work having a com
which is followed by a third cylindrical portion c plane perpendicular to the grinding .wheel‘axis,‘
the working edge/of the diamond I‘! being also
of still larger diameter. Furthermore, a frusto
conical portion d, increasing in diameter towards 'locatedin said plane. With the surface 20' thus
the left, leads to'the last cylindrical portion e. formed, the diamond tool holder 2 is set (and
These portions 0, b and c are shouldered oi! at this prior to the lowering from one shoulder at
right angles with reference to one another as the template I! to the next lower shoulder) ac
shown in Fig. 1. For grinding this type of work curately to the plane of the template shoulder,
by the plunge cut method, i. e., by feeding the
grinding wheel S radially toward the axis of the
work, the surface of the grinding wheel with its
individual adjacent surface portions, must have
its diameter graduated accurately in accordance
with the measurements-when considering the di
ameter of the work, but‘ in inverse relation there
to, the smallest diameter of the work correspond
ing to the largest diameter of the grinding wheel
and vice verse.
(0 .
.
‘
I
It is, therefore, the "essence of this invention ‘to
provide a machine or device which is capable of
and during'iowering is‘held-fastin said plane. 30
According to the invention, this is effected by
positively interrupting the transverse feeding
movement of the diamond holder 2 (produced
by the piston drive 4, 5), by mechanical means
adjustable with the necessary accuracy, as soon
as the guide pin 20 is in the correct position on
the template I2.‘
I
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In the embodiment of the invention as shown
particularly in Figs. 2 and 4, a controlling mem
ber or rail 22 is mounted for the purposes in
tended in a slideway‘in the base slide l, of the' J
diamond tool holder 2 opposite the front surface
‘ Just referred to, and this machine comprises a ' of the frame i,'said rail having notches 23, 22',
dressing profiles of grinding wheels of the type
block shaped‘frame l and a diamond tool holder
2, mounted on the'frame so as-to be slidable in
2l",72l".’, etc., corresponding in number to the
shoulders of the template i9, which notches in
vtwo ‘directions at right‘ angles to each ‘other, association with other mechanism, serve for the
The frame I is fixed relatively ‘to the grinding
control of the shut-off and control valvesl3 in the
wheel, as for instance, onthe upper part 2 of the
following manner:
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The valve spindle 24 of the valve l2 carries a
grinding wheel slide or mounting. On the frame
two-‘armed
lever 25, the arms of which are of
~l
is
mounted
a
hydraulic
drive
4;
S‘
for‘
moving
50
unequal length. The longer arm 26 forms a
the diamond tool holder 2 over the working sur
faceof the grinding wheel, and also mounted on handle for manipulating and operating the mech
said frame are the parts necessary for the control anism, while the shorter arm engages with av cy
of said drive. The axis» of the hydraulic ‘drive lindrical pin 21 in a sleeve 28, which sleeve has
55 4, Send the front surface of theli’rame I are 'screw threaded engagement as at, 29 with a rod 55
parallel to the axis of the grinding wheel. This “ 32 slidable in guides 30, 2| perpendicularly ar
frame has a" horizontal dovetail guide 6, upon ranged with respect to the‘ controlling member
which the base slide. 1 or the diamond tool holder or rail 22. . The guide 20 near the front surface of
moves. ,The slide 1 isconnected- by means of an
the frame i- is widened to form a cylindrical bore
6,0 arm. 8 to the piston rod 9 of piston}, which pis-\
in which the rod 32 is guided by means'of a
ton is adapted to reciprocate within the cylinder "collar 22 on said rodv22, the inner surface of
,4, to which cylinder liquid under pressure is sup
which collar acts as a movable support for a com
plied through conduits |0—il for moving the
" piston in one direction or the other, according to
pression spring 24, the other end of which spring
abuts the bottom of the guide bore 20." The end
the position —of ‘a hand operated reversing valvet of the rod?lllocated in front of the collar 22 is
l2 as will/be. readily understood. The piston formed as a tooth 35, adapted to ?t inone of
drive 4, 5' also includes a shut-oif'and control 'Jthe notches 23, 23', 231,’, 23"’, etc. in the‘rail 22.
valve l3, operable by manually controlled means ' ‘The spring 34 maintains the rod 32 with the tooth
to be hereinafter described. This valve -l2=is ll pressed against the rail' 22, this tooth being
projected in an outward direction, and accordina
70 combined with the reversing valve l2 in the em
79
ibodimen't‘shown, and serves to control the speed .to its position with respect to the said rail, may
of the feeding movement. of the slide ‘I which _ be pressed against the edge thereof, or into one of
,carries the tool holder.’
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- 7
It is to be noted that the front surface of the
~75 slide ‘I’ is also formed as a dove-tail guide i4, dis,
therecesses 22, 22', -23"_and 22"’, As long asgthe
tooth is in contact with the edge of the rail as just
set forth, the'valve I3 is in its openposition. As
his
7 2,133,191
3.
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will more clearly appear hereinafter,'the passage
rail 22 with comparatively rapid ‘speed to its
stantly stopped from further feeding movement.
is ready for the next period of operation.v
area of the valve. may be varied within definite initial position, which is conveniently determined
limits by the adjustment of the sleeve 26 on the ' by the abutment of the piston 4 against the right .
' ‘threaded portion 23 of the rod 32 and in ‘this hand end' of the cylinder 6, as will be readily
manner it is possible to set the speed of the understood. In this position the slide may. be
slide ‘I and with it that of the diamond tool along held by a notch 23"’ in the rail 22, into‘ which
the surface of the grinding wheel, as may be de~v the tooth. 36 enters when operator releases‘the' ‘
sired. When the tooth 33 snaps into any one of ‘hand lever 26 to prevent'further operation of
the hatches of the rail 22, the lever 26 is moved the hydraulic drive. After the diamond tool
holder has been lowered where the guide pin or 10
10 counter-clockwise, whereupon the valve I3 is
member again rests on the template IS‘, the device
closed and the slide ‘I and its tool holder in
It will be seen that for obtaining the desired
control action, it is only .necessary to set the
15 rail 22 opposite the template l9 insuch a manner
‘that one of the notches 23. 23', etc. is directly
opposite the tooth. 36 on the rod 32, and this
when the surface 26' of the‘ guide pin 20 is posi
tioned at the shoulder of the template I! cor
responding to the particular notch in question.
' _
According to the invention a constant speed
of. the dressing diamond over-all‘ ‘parts of the;
grinding wheel pro?le should be maintained with
the aid of the hydraulic drivel; 6. Therefore,
provision must- be made for the frusto-conical
surface, with which the grinding wheel must
act upon part-‘d of the work (to be passed‘ over
bythe diamond during the dressing‘ operation), 20
To accomplish this end, a ?ne adjusting means
_ is provided for the rail 22, and in the embodiment
shown this means is in‘ the form of an adjusting
screw 36 which is suitably connected to the rail
and at the same speed as any of ‘the cylindrical
of the rack and pinion I3, until the guide member
tion for the movement of the slide ‘I on the guide
surface of the template IS. The operator then
means of a notch 39, .which is shallower than
'surfaces of the parts a, 11,0 and e. This requires,
as mentioned above, the reduction of the speed
of the slide ‘I in the direction of the guide 6 on
the axial length of the part d, since 'on this. 25
at one end thereof‘ and serves to move the same
stretch the diamond must be simultaneously
backward and forward within its slidewaye
After the automatic stopping of the slide ‘I, the moved in horizontal and vertical directions.v The
operator may now move the diamond tool holder vertical displacement is effected by means of
2 freely and in a downward direction by means the rack and pinion drive I6. The speed reduc-'
or pin 20 bears against the next lower shouldered‘ » 6 can be achieved with the means described by _
moves the hand lever 26 in a clockwise direction
I, until the rear end of the rod 32 abuts against
a movable abutment 31 disposed in the bearing
3|, and in this position of the rod 32, the tooth
35 is withdrawn to a slight extent beyond the
edge of the rail 22, and furthermore, the valve
I3 is again opened to permit further feeding
movement of the slide ‘I and its tool holder so
that the tool may operate on the shouldered
surface of the grinding wheel just selected. As
will be readily understood, the rail 22 will be
moved along with the slide ‘I and after said
'40
45 rail has moved a slight distance, or in other
words, when the previously engaged notch in
the other notches and thus, when the tooth 35
snaps into said notch, it effectsmerely throttling,
but not complete closure of thevalve I3. The. as’
extent of throttling follows from the condition
that. the speed of the slide 1' on its guide 6 with}
in the range of the profile section d must be
reduced to v .- cos a'when v is the speed of the
diamond tool on the grindlng‘wheel and a half
of the top angle of the‘gfrusto-conical portion
(1. It isto be noted that theedge 0f the notch 39
which is’located in the front,in the direction of‘ v >
movement of the slide 1, must be shouldered off ‘
at right angles, to initiate suddenly the change
of speed whenthe guide pin," passes onto the
incline, but that the ‘exit or tail edge of the
the smooth edge of said rail is opposite said ,notch must be inclined so as to cause the toothv '
'
tooth, then the operator may release the lever‘ 26, ' .35 to. be positively lifted out of the notch-39.‘
said rail has moved beyond the tooth“ so that
as the valve is now maintained in open position ‘by
' f The described‘ method of speed regulation is 50'
the engagement of said tooth 36 with the'smooth' also applicable to pro?les, which'in'clude curved.
edge of the control rail 22. Thus the rod 32 is ‘ portions continually merging one into the other.
The fundamental principle‘of the invention is
supported as before by the control-rail, and as
not affected by varying the construction of the
the feeding movement of thepdressing tool pro‘
55 gresses, said rod will be, so supported until the ~ guiding of ‘the diamond Itool holder. 2 _.by means 55
next notch in the control rail is brought opposite
- the tooth 35, whereupon said tooth snaps into
of the template 19.. Instead of raising and
lowering. the diamond tool holder manually ‘by
said notch, and the valve is moved to closed posi , means of the rack ‘and pinion drive ‘I3, an auto
tion to stop further feeding movement as above maticallyoperating-hydraulic or mechanical de- 1
described.
-
vice may be~ provided, which may bev so, ?tted'into.
'
It is also to be noted that the slide .1 may be
' stopped in the same manner at the-completion,
the cycle of.;'operations that the device is ren
dered thereby fully" automatic.. The changes in
of the dressing operation by the notch 23". " the directions of movement of the slide’ ‘I may.
After said slide has ‘been so stopped, the opera
alsovbeirender'ed positive in known manner by '
65
tor‘raises the diamond tool 2, with the aid of the. - " means of
vabutinents cooperating with the revers-'
rack and pinion drive I8 to the full height of
the pro?le; sets the reversing v'alve l2 to proper
jing valve I2. The important point is that in. all
position ‘for reversing: and thereupon turns the
one shoulder diameter to the next. lower-‘one
' hand lever 26 in a clockwise direction to move
arrangements the diamond tool passes over? from
. while the slide ‘I is at standstill;v _' > ‘
.70 rod 32 into engagement with abutment 31 against
the tension of spring 33 until the extreme position
'
.
I-claim is:
'.
"
.
1' l~._-A machine for dressing
of the rod 32, in the direction in which it is moved, _grinding wheels, comprising‘ a ?xed "frame, a‘
tool
is reached..- The valve 13 is' thereby set to its template carried by said frame, a"
full open position and the slide returns together holder mounted for movement 'uponsaid frame,
75 withthe diamond tool holder‘ 2' and the control _ 1 a guiding member carried by said tool holder. and
1
7o‘.
shouldered pro?led.‘ '
4
9,188,191
in engagement with the template for guiding
the feeding movement of said dressing tool holder
and controlling the tool holder and its dressing
when reaching a profile shoulder on the grinding
tool during the dressing operation, hydraulic
wheel.
mechanism for reciprocating said tool holder for
feeding the too] over the work, and a control
member also mounted‘ on . saidv tool-1' holder and
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6. In a machine according to claim _1, wherein
the controlmember may be adjusted in accord 6
ance with: conditions surrounding any. particular
dressing operation.
'
in cooperative relation with the hydraulic mech
anism for stoppingthe feeding movement of said
7. Ina machine according to claim 1, wherein
too], said control member movable with said tool; the dressing tool holderi'may be adjusted and
10 holder to permit the desired feeding movement have. movement in. bothvertical and horizontal 10
of the tool and thereafter effecting interruption- directions. for the purposes intended.
of the fluid pressure to said hydraulic mechanism“~
8. In a machine according to claim 1, wherein
when the guiding member reaches va predeter
a combined reversing and shut-off or throttling
mined point on the template.
valve is. used for controlling the ?uid pressure
2. In a machine according to claim 1, wherein delivered ‘to the hydraulic mechanism.
15
a valve is provided in the hydraulic system for
9. In a machine according to claim 1, wherein
interrupting the supply of ?uid pressure to said is provided adjustable mechanism in connection
system at each profile shoulder of the grinding with a control valve for delivering ?uid pres
wheel and wherein said valve alsocontrols the sure to the hydraulic mechanism, and this for
the purpose of controlling-the feed velocity of, 20
20 feed velocity of the dressing tool during th
operating stroke of said tool.
“
the dressing tool during the operating stroke <
3. In a machine of the character ‘set forth Of said tool.
according to claim 1, wherein the mechanism
for stopping the feeding movement of the dress
ing tool at each pro?le shoulder, is released to
permit restarting of the tool for another of the
series of predetermined work operations during
each complete stroke of the tool, and also re
10. In a machine according to claim 1. wherein '.
the control member or rail is adjustable with
respect to the template and its cooperating tool 25
holder guiding member forv the purposes in
tended.
.
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'
.
11. In a machine according to claim 1, wherein
leased for the rapid return of ‘the tool to its I
the
tool
control
holder and
member
capable
is slidably
of beingmounted
moved inona the
di- ,30
initial position after said complete stroke of the
tool over the grinding wheel being dressed.
rection in line with the feeding movement of the
' 4. In a machine according to claim 1, wherein
tool holder and also adapted to be held in any
the control member is so formed that it oper
one of a number of adjusted positions thereon-K
ates to maintain the valve for the hydraulic by meansof an adjusting screw.
mechanism in proper position to bring about
12‘. In a machine according to claim 1,‘ where-_ 86 '
constant and uniform feeding movement of the in‘thecontrol member cooperates with the hy
dressing tool with respect to the grinding wheel draulic mechanism to throttle the same and
pro?le surface, and also for intermittent closing reduce the ieeding'speed of the dressing tool
of the valve to permit accurate stopping of said when operating on grinding-wheels or other work
feeding movement of the dressing tool when . having frusto-conical portions and before effect
reaching a profile shoulder on the grinding wheel. ing complete interruption of the fluid pressure
5. In a machineaccording' to claim 1, wherein for stopping the feeding movement of the tool.
the control member operates a valve for stopping -
"
HERMANN DANNER.
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