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Патент USA US2122184

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June 28, 1938.
A. scRNENE?
’
GMNDING
MACHINE
v2,122,184 f
Y
Filed Jan. l5, 1937
alzarsi
' Patented June 28, 1938
,d narran srares ‘PATENT ermee
Application January 15, 1937, Serial No. 120,708
In Great Britain February 14, 1936
3 @Balma (Cl. 51-103i
This 'invention `is for improvements in con
nection with g'rinding machines of the kind in
which the work-piece is supported between cen
tresand is mechanically rotated in pressure con
5 tact with a rotating grinding wheel.
The object is to provide, in a grinding ma
chine of this kind, a means of generating screw
threads or other helical surfaces of a high de
gree of accuracy and finish, or of correcting such
surfaces after generation by a less accurate
method or after a hardening or like operation,
and of therebyÍ facilitating the continuous out
put necessary in the repetition grinding of screw
threaded bolts, studs, and the like.
According to the present invention, in a grind
15
ing machine of the kind referred to, the centred
' work-piece is correctly aligned in relation to an
nular serrations cn the grinding wheel by means
of .a universally adjustable control finger which
contacts with the helical surface either of the‘work-piece or‘of a master former rotatable be
' tween centres in axial alignment with the work
piece centres, said control finger. serving also- to
traverse the rotating work-piece across the face
25 of the grinding wheel at a rate governed by the
speed of rotation of the work-piece and by the
pitch of said helical surface.
In order that the inventionV may be clearly
understood and readily carried into practice,
30 reference may be had to the appended explan
atory drawing, in which:
`
Y
Figure l is a front elevation, and Figure 2 is
a plan, of such parts of a grinding machine as
are necessary to illustrate the invention.
Figure 3 is asimilar plan illustrating a modi
35
fied form of the invention.
-
Figure a is an end elevation of a detail herein
after referred to.
Similar letters refer to similar parts through
40 out the several views.
’
direction of the axis of the work-piece a.
At
right angles to the slide table f is arranged an
other slide carrying the rotatable grinding
wheel î, which therefore is capable of move
ment at right angles to the axis of the work
piece a, this movement determining the-size of
the work-piece a diametrically. The face of the
grinding wheel i is formed with annular serra
ti'ons disposed >at right angles to the axis of the
work-piece av and adapted to produce the desired
form upon the work-piece a, which is rotated _by
a backing wheel y' mounted either on a pivoted
arm or on a slide so that it can be spring-loaded
or otherwise urged towards the work-piece a
so as to drive it by frictional contact. The
backing Wheel y’ is geared to an electric motor
or other source of power so as tovbe driven at a
speed which imparts a suitable peripheral ve
locity to the work-piece a. Attached to the
Agrinding wheel head is an arm k carrying a con
20.
trol ?inger l which abuts radially on the top
of therwork-piece a„ this iinger l being spring
loaded and being universally adjustable in rela
tion to the ,work-piece a, that is to say, it has
a fine micrometer adjustment in directions par 25
allel to the axis of the grinding wheel i, and is
also adjustable in two planes at right angles to
the grinding wheel axis to suit various diameters
of work-piece and grinding wheel, the con
trol finger l being also rotationaily adjustable
in its bearing.
ì
In the operation of this form of the machine,
the grinding wheel Ai is first withdrawn either
manually or automatically, taking with it the
control finger l. The work-piece a is then in 35
serted between the centres b, and the backing
wheel 9’ is brought into contact-so as to rotate
the work-piece. The grinding wheel i> is then
brought upto the work, the control finger l con
jtacting with the work-piece a and aligning it 40
In a convenient method of carrying the iin-> with the serrations on the wheel í, which is now
vention into effect,V as illustrated in ië‘lgures` 1 in its grinding Iposition. ^ It will be seen that
and 2 and as applied by way of example to a the eiîect of the control ilnger l engaging with
grinding machine of the kind referred to for the initially formed screw-thread on the rotat 45
the correction of screw-threads initially formed ing work-piece a is to cause the slide f which
yit uponÍ
bolts, studs, and the like by a rolling or other carries the work-piece to travel across the face
operation, the work-piece a is mounted between of the grinding _wheel i for the grinding opera
a pair of centres b of which one is adjustable tion, at a rate governed by the Yspeed of rotation`
of the work-piece a and by the pitch or the
as at c for varying lengths of work and is spring
thread thereon.l Pieces having a threaded length
loaded
as
at
d
so
as
to
support
the
work-piece
a
50
but leave it free to rotate, the centres being not exceeding the width of the grinding wheel i
will be completed in a little more than one revo
mounted in anti-friction bearings. The head
stocks e _carrying the centres b are mounted on lution, whilst any longer piece will revolve until
a table î which slides freely on anti-friction the whole of its threaded surface has passed
the wheel i or the control ñnger i.
55 bearings g on the bed h of the machine in the
2.
2,129,184
As an alternative to the adjustable mounting
t of the grinding wheel i, the grinding wheel head
I claim:
In a grinding machine of the kind described.
may be stationary, and the whole of the ,other - for1. the
correction of screw-threads and other
mechanism be arranged to slide in a direction at
helical
surfaces,
the combination of an annularly
right angles to the axis of the work-piece a.
serrated grinding wheel, a pair of centres adapted
Moreover the complete slide unit may be dupli
to support the work-piece, a. backing wheel
-cated so vas to provide a series of loading and
operating stations, the work being loaded at one
station whilst it is operated on at another, and
10 the change of stations being eii’ected either
manually or automatically.
In another method of carrying the invention
into eñ’ect, as illustrated in Figure 3 and as ap
plied by way of example to a grinding machine
15 of the kind referred to for the generation and
finishing of screw-threads upon bolts, studs, and
the like, the work-piece blank a is mounted be
tween one pair of centres b, and a master former
m is similarly mounted between another pair of
centres bl, the two pairs of centres b and b1
being disposed in axial alignment, and both the
'work-piece a and the former m being of the
adapted to rotate the work-piece between said
centres in pressure contact with the grinding
wheel, and a universally adjustable control finger
adapted to abut on the helical surface of the 10
work-piece, said finger ensuring that the screw
threads on the centred work-piece are correctly
aligned in relation to the annular serrations on
the grinding wheel, and serving also to traverse
therotating work-piece across the face of the 15
grinding wheel at a rate governed by the speed
of rotation of the work~piece and by the pitch of
the helical surface.
2. In a grinding machine of the kind described,
for the generation of screw-threads and other 20
helical surfaces, the combinationof an annularly
serrated grinding wheel, a pair of centres adapted
same diameter. The work-piece a and the former ~to support the work-piece, a backing wheel
1p. are rotated by separate backing wheels fand j* adapted to rotate the work-piece between said
which are independently urged forward to pro-- centres
in pressure contact -with the grinding
vide a frictional drive at the same speed both for wheel, a helically surfaced master former, a pair 26
the work-piece a and for the former m. The of centres adapted to support said master former
face of the grinding wheel i is formed with an-~ 'in axial alignment with the work-piece, a backing
nular serrations disposed at right angles'to the wheel adapted to rotate the master former be
30 axis of the work-piece a and adapted to produce
tween said centres at the same speed as the work
the desired form on the work-piece a. A uni
piece, and a universally adjustable control ñnger
versally adjustable control finger l as hereinbe
adapted to abut on the helical surface of the
fore'described is attached to the grinding wheel master former, said ñnger ensuring that the
head by a carrier arm Ic so as to be adapted for centred work-piece is correctly aligned in rela
engagement with the screw-thread on the master tion to the annular serrations on the grinding
former m.
'
In the operation of this modified form of the
machine. the `machine is loaded as herelnbefore
described with reference to the ñrst form of the
invention, and it will be seen that as the control
finger l is in engagement with the master former
wheel,A and serving also to traverse the rotating
35
work-piece across the face of the grinding wheel
at a rate governed by the speed of rotation of the
master former, and by the pitch of the helical
surface thereon.
'
v
3. In a grinding machine of the kind described,
m .rotating at the same speed as the work-piece '
for the generation of screw-threads and other
a, this causes the workepiece a to travel across helical surfaces, the combination of an annularly _
the face of the grinding wheel i, thus generating serrated grinding wheel, a pair of centres adapted
,the desired screw-thread and thereby reproduc
,to support the> work-piece, a backing wheel
ing the form of the master m on the'blank o, one adapted to rotate the work-piece between said
or `more revolutions being required to complete centres in pressure contact with the grinding
the piece. When-it is required to pass the work wheel, `a helically surfaced master former, a pair
ìhrough the machine more than once, for example of
centres' adapted to support said master former
or the production of a highly accurate finish, a
axial alignment with the work-piece, a backing
second control finger l1 may be provided, this4 in
wheel adapted to rotate the master former be
' operating in association with the screw-thread
tween said centres at the same speed as the work
eratedl on the work-piece a and being ad
piece, a universally adjustable control finger
._ì table both in relation to the primary control - adapted to abut on the helical surface of the
¢ - er land to the 'serrations on the grinding
master former. and a second control finger
wheel i, so as to assist in re-positioning the work
piece a on the grinding wheel i for the secondary
grinding operation.
'
`
It will be appreciated that work with aninter-.
adapted to abut on the helical surface generated
on the work-piece. the first-mentioned control
linger ensuring that the centred work-piece is i
correctly aligned in relation to the annular ser
rupted surface can betground. provided that a
rations on the grinding wheel, and serving also
continuous surface is available at some part or _ to
traverse the rotating work-piece across the
other so that the backing wheel i can rotate the face of the grinding wheel at a rate governed by
work-piece. For example, screwing taps may'be
treated by arranging the backing-wheel 1 against the speed of rotation of the master former and
eter of the master former m to suit. For this
type of work, when a second pass is required, the
by the pitch of the helical surface thereon, and
the second control finger serving to facilitate the 05
correct realignment of the screw-threads gener
second control finger ll may be extended laterally
secondary grinding and finishing operation being
the shank of the tap and by adjusting the diam
as shown in Figure 4 so as to bridge the flutes cix
70 of the work-piece a and engage two lands at the
same time.
.
.
‘
ated on the centred work-piece in the event of a
required.
,
°
-
sRTHUR scarvENER.
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