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Патент USA US3021657

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Feb. 20, 1962
B. CRETIN MAITENAZ
HONING MACHINE
Filed April 7. 1960
3,021,647
Feb. 20, 1962
B, cRETlN MAITENAZ
3,021,647
HONING MACHINE
Filed April 7, 1960
2 Sheets-Sheet 2
s atent
g
u
3,021,647
Patented Feb. 20, 1962
2
centre of curvature of the part A. The cam N is designed
3,621,6é7
so that, having regard for the size and shape of the other
moving parts, a sweeping motion of uniform abrading
action shall be provided by the part F over the whole
HONING MACHINE
Bernard Cretin Maitenaz, Joinviile-le-Pont, France, as
signor to Societe des Lunetiers Cottet Poichet, Tagnon
8: Cie, Paris, France
-
of the surface A.
'
The contour of the cam N can be
determined by calculation in a ?rst approximation, and
Filed Apr. 7, 1960, Ser. No. 20,730
can then be modi?ed experimentally by testing on a
Claims priority, application France Apr. 7, 1959
2 Claims. (CI. 51—55)
spherical surface A.
The component elements of the machine must be de
When it is desired to impart, to parts made of metal or ll) signed to allow the abrading piece F to sweep the whole
ceramics, a surface ?nish which is close or equal to an
of the area A, namely so that the angle 5 formed by
optics standard of polish, it is necessary for the polishing
the axis of the housing H with “the axis of the mount B
phase to be preceded by a honing operation.
can reach the maximum value a. The sweeping motion
Honing generally consists in rubbing the- part to be
is obtained by the combination of the rotation of the
worked against another part of complementary shape, 15 spindle B—and hence of the part A--and the rocking‘
and in interposing, between the two, an abrasive agent
motion of the housing H, and hence of the abrading
which, by its abrading action, will progressively bring the
piece F.
I
part to be Worked to the desired shape. This operating
method is commonly used for honing spherical or toroi
dal
surfaces.
.
a
.
This sweeping motion issupplemented by an abrading
motion caused by the rapid rotation of the eccentric driv
20
"
When it is desired to hone other surfaces, it is necessary
to resort to different means. As an example, use is made
ing point G, this rotation being transmitted through the
medium of a ?exible drive S which connects the spindle
-H to a motor R mounted on the chassis I, for example.
of a ?exible honing tool whose surface is locally faced
In actual fact, the eccentricity of the driving point G is
with metal elements, the surface of these elements mating
of the order of 1 millimetre, which’ permits rapid rotations
with the surface to be worked. Unfortunately, since 25 to be obtained about the axis of the:_spindle H._ The
the degree of abrasion depends upon the ‘pressure exerted,
abrasive agent, the feeder system forwhich is not shown
this method tends todeform the original surface.
in FIG. 1, will thus allow'theabrading-piece F to abrade
In order to overcome this drawback, recourse may
evenly and without anydeformation of the surface A, re-_
be had to a machine such as forms the object of the pres
gardless of whether the latter is metallic or ceramic. ’ ,
ent invention, by means of which it is possible to obtain 30
The machine can usefully be completed-by acoun
a localized honing, area by area, the rate of abrasion be
t’erweight Y which is mounted 'for sliding’ adjustment on
ing designed so that it shall be uniform at all points on
a rod forming one piece with the rocking chassis I-. By
the surface. This result is achieved by the use of a small
suitably setting the position of this counterweight, the‘
size honing tool which is integral with a spindle capable
pressure exerted by the abrading-piece F on the surfacev
of imparting to it two separate motions, of which one is
of the part to be honed can be adjusted to vsuit the work
a rapid local abrading motion while the other is a slow
to be carried out and in particular the nature of the ma
overall sweeping motion.
'
. '
terial from which the part to be honed A and the abrasive
In order toexplain the general arrangement adopted in
used are made.
’
-
'
the machine which enables these results to beachieved,
FIG. 2 shows the various componentelements of the
reference will be made to the accompanying drawing in 40 upper moving assembly, including the chassis I and its
which:
roller M and the connecting-rods I and K which linkthe
FIGURE 1 is a general side view of the machine.
housing U to the chassis I. .The two connecting-rods are
FIGURE 2 is a partial plan view of the moving spindle
generally of monobloc design so as to, ensure a'high del"
carrying parallelogram.
gree of rigidity in the whole system._ Anfoperating han-.
FIGURE 3 is an enlarged view of the lower portion 45 dle T can be provided to allow the ‘entire moving assem
of the spindle and of the abrading-piece. .
.
FIGURE 4‘is a" possible 'variant‘for honing concave
surfaces.
. bly to be raised when changing the glass‘.
FIG. 3 shows the abrading-piece on a larger scale‘and'
in greater detail. In it can be seen the driving point G
Referring now to FIG. 1, the glass A is secured to a
which is eccentric relative to the axis of the spindle H
mount B which is rotated through the medium of gear 50 and the glass A. A pipe W leads in a continuous supply
wheel C and worm D, a pulley B being keyed to the
of abrasive agent, while a protective dome V mounted on
Worm. On to the glass A is applied an abrading-piece
F prevents the abrasive from penetrating into the step
F through the medium of a point G; this point G which is
bearing of the abrading-piece F.
integral with a spindle H mounted for axial rotation in a
Since this machine is designed to be used primarily for
housing U, is eccentric relative to the axis of the spindle. 55 non-spherical surfaces, an abrading-piece of small size,
The spindle H is maintained parallel, at all times, to an
say 16 mm., should be chosen. Naturally, this size is
oscillating chassis I by means of a pair of connecting-rods
given by way of indication only and it is obvious that,
J and K which are of equal length and which are articu
without departing from the scope of the invention, the
lated respectively on to H and I. The chassis is able
eccentricity of the driving point G and the size and shape
to rock to and fro about a horizontal axis which is per 60 of the abrading-piece F can both be modi?ed.
pendicular to the plane of the ?gure and which is desig
In FIGS. 1 to 3, the part to be honed A is shown to
nated by an’. The mount B is designed to make it possi
be of a convex shape. Clearly, the machine can be built
ble to bring the mean centre of curvature L of the part to
be honed A on to the same level as the rocking axis W’.
to enable concave parts to be honed. FIG. 4 shows the
layout of the moving parts for honing a substantially
In addition, the length of the point G is adjusted so that 65 spherical concave surface having a radius of about 80
I and K shall be substantially horizontal.
' mm. Taking into account the sizes that would be prac
The chassis I carries a roller M and is rocked about its
tical for the housing U and the chassis I, the mean centre
shaft 1m’ by reason of the fact that this roller M bears
of curvature L will be shifted to between the connecting
on a cam N which is slowly rotated by a reduction unit
rods J and K. In consequence, the roller M and the axis
0 whose input sprocket P is driven by a chain Q. The 70 uu' will likewise be located between these connecting-rods.
axis of the spindle H, being at all times parallel to the
If the radius of curvature of the concave part A is very
axis of the chassis 1, passes through the point L, the mean
small, the point L will be located below the connecting‘
»
rod K. Conversely, if the radius of said concave part is
4
said spindle to drive said spindle, a cam rotatably sup
ported by said frame for rotation about an axis parallel to
said axis of oscillation of said frame, means for rotating
su?iciently large, the point L may, in certain cases, be
shifted to above the connecting-rod J.
In the interests of simplifying the ‘description given
above, the connecting-rods J and K have been assumed
to be equal and parallel. A useful variant consists in
carried by said arm and engaging said cam, whereby rota
tion of said cam produces oscillation of said frame to
resorting to an articulated quadrilateral instead of to a
gether with the members moveable therewith including
said cam, an arm ?xed on said frame, and a cam follower
regular parallelogram. A choice of unequal lengths for
the two pairs of'connecting-rods and the difference be
said motor having a center of gravity offset from a vertical
plane passing through said axis of oscillation in a direc
tween the, two opposite sides thus enables a better per 10 tion to maintain said cam follower in engagement with
pendicularity to be permanently achieved for the spindle
said cam by gravity.
H with respect to the nomcircular meridian of the part
2. A machine for honing a surface of a work piece,
to be honed.
which comprises a stand, a rotatable mount for said work
To allow for non-stop- operation, the layout described
piece supported by said stand for rotation about a vertical
hereinabove can be further completed by a bowl X to al 15 axis, means for continuously rotating said mount, a frame
low the abrasive agent to be recovered and returned to
mounted on said stand for oscillation about a horizontal
the pump.
axis offset laterally from the axis of rotation of said
The above description of the machine has been given
mount, a spindle rotatable in said bearing member and
by way of example only and not in a limiting sense and
having on its lower end a driving point eccentric of said
it is possible, without departing from the scope of the 20 spindle, a honing member having an axial hole engaging
invention, to resort to other arrangements for the various
said driving point whereby rotation of said spindle pro
component elements, the object of the invention being
solely the combining of a rapid local abrading motion and
a sweeping motion, these two‘ motions together ensuring
duces orbital movement of said honing member, two pairs
of vertically spaced parallel links each pivotally connected
uniform abrasion over the whole of the surface. Thus it
would be possible for a vibratory motion to be imparted
to the driving point G instead of the circular motion re
ing member whereby oscillation of said frame produces
oscillatory movement of said bearing member, said links
being substantially horizontal and shorter than said frame,
ferred' to.
a motor mounted on said frame with its axis approxi
at one end to said frame and at the other end to said bear
What I claim is:
mately parallel to said frame and having a shaft, a ?exi
l. A machine for honing a surface of a work piece, 30 ble cable connecting said shaft with said spindle to drive
which comprises a stand, a mount for said work piece
said spindle, a cam rotatable support on said frame, means
rotatably supported ‘in said stand for rotation about a
including speed reducing means for rotating said earn, an
vertical axis, means for continuously rotating said mount,
arm ?xed on said frame, a cam follower carried by said
arm and engaging said cam whereby rotation of said cam
a frame mounted on said stand for oscillation about a
horizontal axis offset laterallyrfrom the axis of rotation 35 produces oscillation of said frame, and a variable counter~
weight biasing said frame in a direction to maintain said
rotary‘ spindle rotatable in said bearing member and hav
cam follower continuously in engagement with said cam.
ing on its lower end a driving point eccentric of said
References Cited in the ?le of this patent
spindle, a honing member havingan axial hole engaging
said driving point whereby rotation of said spindle pro 40
UNITED STATES PATENTS,
duces orbital movement of said honing member, two pairs
of said mount a bearing member above said mount, a
of vertically spaced parallel links each pivotally connected
1,639,012
at one end to said‘ frame and at the other end to said
2,087,514
Hubbell .____., _________ __ July 20, 1937
bearing memberwhereby oscillation of said frame about
its axis produces oscillatory movement of said bearing
2,352,146
2,392,478
Desenberg ____________ __ June 20, 1944
Holman ,____,__._. _______ _- Jan. 8, 1946
45
member, said links being substantially horizontal and hav
ing a length greater than the distance between the axis of
oscillation of said frame and its pivotal connections of
the uppermostpair of said links, a motor mounted on said
frame, ?exible
means connecting said motor with 50
Tillyer ________ _.,.____,._., Aug. 16, 1927
2,715,803
Bronson ______ .._, _____ __ Aug. 23, 1955
2,880,555
Brueckner ____________ __ Apr. 7, 1959
377,701
Italy __,._,__-..,_,.. ______ __,.. June 3, 1940
FOREIGN PATENTS
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