Information
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Patent Grant
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6409578
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Patent Number
6,409,578
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Date Filed
Monday, July 31, 200023 years ago
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Date Issued
Tuesday, June 25, 200221 years ago
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Inventors
-
-
Examiners
Agents
-
CPC
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US Classifications
Field of Search
US
- 451 51
- 451 61
- 451 439
- 451 430
- 451 124
- 451 150
- 451 129
- 451 140
- 451 143
- 451 27
- 451 9
- 451 11
- 451 237
- 451 246
- 451 285
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International Classifications
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Abstract
A method of grinding the bore of a rotary spindle, the bore having a taper, to true the bore while the spindle rotates about a spindle axis, the steps that include providing a support attachable to a base associated with the spindle; providing an angled slide on the support, the slide being movable endwise relative to the spindle and at a predetermined angle to the spindle axis, that angle corresponding to the spindle bore taper; providing a rotary grinder on the angled slide to be movable endwise therewith while the grinder rotates, bodily adjusting the spindle to bring the spindle bore into position to be ground by a grinder as the grinder is moved on the angled slide relative to the bore, and as the spindle rotates; and operating the grinder to grind the tapered bore as the spindle is rotated and as the angled slide is moved endwise, at a predetermined angle.
Description
BACKGROUND OF THE INVENTION
This invention relates generally to truing the bores of rotary spindles, and more particularly concerns method and apparatus for effecting said truing by grinding the spindle bore while the spindle itself is rotating.
There are many advantages to grinding a spindle in place, one being the low down time. If the spindle were to be removed, more than likely the bearings and seals would, or at least should, be replaced. This becomes a procurement problem. Some seals and bearings can be long lead time procurement items. The spindle then needs to be sent out for grinding. This is also time consuming. All of this processing requires highly trained personnel, because in reassembly bearing preload and alignment is important.
There is another advantage to grinding in place, having to do with negating the run-out inherent in the bearings. By grinding in place, all items are taken into consideration and trued up.
U.S. Pat. No. 5,321,918 to Brian provides improved method and apparatus to enable grinding of a machine tool spindle in place, i.e., without removing it from the machine. That patent discloses a highly advantageous method of grinding the tapered bore of a rotary spindle, to true bore, and while the spindle rotates about a spindle axis, the steps of that method including:
a) providing structure including a master plate having a surface facing said bore, said surface having a predetermined boundary to define a center,
b) providing an angled slide on said structure, the slide being movable endwise relative to said spindle and at a predetermined angle to said axis, said angle corresponding to the spindle bore taper,
c) providing a rotary grinder on said angled slide to be movable endwise therewith while the grinder rotates,
d) adjusting said structure to bring said master plate surface into perpendicularity to said axis and to bring said center into coincidence with said axis, and
e) operating said grinder to grind said tapered bore as the spindle is rotated and as said angled slide is moved endwise at said predetermined angle to said structure.
There is need for further simplifying the above process, as for example to reduce weight and or bulk of the overall apparatus. This is particularly important in instances when the grinding apparatus must be transported to the site of a spindle or spindles to be ground, i.e. process simplification to enable apparatus portability is required.
SUMMARY OF THE INVENTION
Basically, the method of the invention concerns grinding the bore of a rotary spindle, said bore having a taper, to true said bore while the spindle rotates about a spindle axis, the steps that include:
a) providing a support attachable to a bore associated with said spindle,
b) providing an angled slide on said support, the slide being movable endwise relative to said spindle and at a predetermined angle to said axis, said angle corresponding to the spindle bore taper,
c) providing a rotary grinder on said angled slide to be movable endwise therewith while the grinder rotates,
d) adjusting said spindle to bring said spindle bore into position to be ground by said grinder as the grinder is moved on said angled slide relative to the bore, and as the spindle rotates,
e) operating said grinder to grind said tapered bore as the spindle is rotated and as said angled slide is moved endwise at said predetermined angle.
The above basic method takes advantage of accurate adjustability of the spindle so as to eliminate need for an additional slide carrying the angled slide and the rotary grinder, as disclosed in U.S. Pat. No. 5,321,918 referred to above.
Additional steps of the method may include adjusting the spindle in two directions, the first direction moving the spindle toward a guide surface extending in a second direction; and the spindle then being adjusted in that second direction to bring the spindle bore into position to be ground, as referred to. The axis of the spindle then coincides with the axis of a cone defined by the angled slide.
Further steps include providing a portable package which includes said support, the slide, the rotary grinder and the guide surface, and transporting the package to the location of the spindle and bore, for performing the steps a)-e) above.
In this regard the method may also include the step of removably attaching the support to the base, at the spindle site. Since need for a second slide for the support is eliminated, overall weight of the portable package is substantially reduced.
The basic apparatus for performing the method includes:
a) a support attachable to a bore associated with the spindle,
b) an angled slide on the support, the slide being movable endwise relative to said spindle and at a predetermined angle to said axis, said angle corresponding to the spindle bore taper,
c) a rotary grinder on said angled slide to be movable endwise therewith while the grinder rotates,
d) the spindle adjustable in two dimensions into a position enabling grinding of the spindle tapered bore by the grinder as the grinder is moved on said angles slide relative to said bore, and as the spindle rotates,
e) said grinder then operable to grind said tapered bore as the spindle is rotated and as said angled slide is moved endwise at said predetermined angle.
As will be seen, a guide surface is preferably attached to or integrated with the support, one of the two adjustment dimensions being a direction extending toward the guide surface (for example an X-direction), and the other of the two adjustment dimensions being a direction extending lengthwise of the guide surface (for example a Y-direction).
These and other objects and advantages of the invention, as well as the details of an illustrative embodiment, will be more fully understood from the following specification and drawings, in which:
DRAWING DESCRIPTION
FIG. 1
is a section taken through a spindle, the bore of which is to be ground in place;
FIG. 2
is a schematic view of apparatus and method for accomplishing grinding of a spindle bore;
FIG. 3
is a schematic view of apparatus; and
FIG. 4
is a schematic plan view diagram.
DETAILED DESCRIPTION
In the drawings, a rotary spindle
10
is rotatable by means generally indicated at
11
, to rotate about an axis
12
. The spindle is typically used during machining, such as milling, and may receive the shaft of a milling tool, the rotary tool engaging the spindle tapered bore
13
. The latter typically becomes larger at its larger end
13
a
in use, due to wear. Also, chips and other foreign material may become trapped at the taper and cause deformation and taper deterioration. This can lead to decreased tool life, excess vibration, our of tolerance condition of the work to be machined, and poor finish of the latter.
Referring to
FIG. 2
, method and means is provided to perform grinding of the spindle bore, without removing the spindle from the machine tool apparatus, i.e., in-place grinding to “true-up” the bore relative to axis
12
. In this regard, the method, as claimed herein, may be carried out using apparatus to be described, or other equivalent apparatus. Such apparatus includes structure, including a support
22
having a surface facing the aligned bore
13
, that surface having a predetermined boundary to define a center.
The support
22
is attached to machine bed indicated at
25
and associated with
10
. See for example clamp or clamps
200
adjusted to hold the support
22
to bed
25
. The clamps are preferably removable to permit transport of the apparatus to another site.
The angled slide
27
is supported by mount
28
a
rigidly mounted on the support
22
, the slide
27
being movable endwise (see arrows
33
) relative to the structure
20
and at a predetermined angle a relative to the plane of the top surface
29
of the support
22
.
A rotary grinder
31
is carried on the angled slide
27
to be movable endwise therewith in direction
33
, while the grinder head
31
a
is rotated about an axis
32
parallel to the direction of sliding movement of the slide
27
. See arrows
33
. A motor to rotate the head
31
a
is indicated at
34
; and
35
indicates the slidable connection of the grinder head to move endwise in the direction of axis
32
.
The grinder head
31
a
is operated to engage the spindle bore
13
for grinding same to true the bore as the spindle rotates and as the head rotates, whereby the bore is concentrically trued about the spindle axis
12
.
In accordance with a further aspect of the invention, the spindle
10
is adjusted to bring a master plate surface
29
into facing relation to the spindle axis
12
, and to bring the center
29
a
of that surface into coincidence with axis
12
, after which time the grinder may be operated, as described, to true the bore. The master plate
30
has a boundary being employed during the adjustment of spindle
10
, as referred to. Typically, the boundary indicated at
38
extends circularly about the master plate surface, and about center
29
a
, whereby a sensor, including an indicator
39
, may be employed to engage the circular boundary during the spindle position adjustment, as referred to. The indicator is carried by a shaft
40
associated with the spindle, that shaft having an axis coincident with axis
12
. During set up, the shaft carrying the indicator is rotated about axis
12
, and the indicator tip
39
a
engages the circular boundary, or edge
38
, of the plate
30
and surface
29
. Axis
12
remains perpendicular to machine bed surface
25
a.
If the indicator displays no gauge movement as shaft
40
is rotated, it means that the adjustment of the spindle has been such as to locate edge
38
concentrically about axis
12
, and to locate center
29
a
coincident with axis
12
. Such adjustment includes X-Y direction adjustment of the spindle relative to support
22
. Axis
12
extends in the Z direction of the X-Y-Z rectangular coordinate system.
Thereafter, the grinding tool may be operated, as described, to true the tapered bore
13
. As referred to, the grinding tool
31
may be moved endwise in opposite directions
33
, now correctly angled relative to axis
12
for correctly truing the tapered bore about axis
12
, as the grinding head is moved endwise back and forth.
After completion of grinding, the apparatus is separated from the spindle, and the latter is then in condition for mounting a rotary tool machine or device engaging the bore
13
, correctly and accurately centered.
Referring to
FIG. 3
, the modified apparatus is generally like that of
FIG. 2
; and corresponding identifying numerals have an appended prime designation. Two indicators,
139
′ and
239
′, are employed on
40
′ and have tips
139
a
′ engaging the top surface
29
′ near its outer edge, and engaging the outer cylindrical surface
130
′ of plate
30
′. A machine bed is seen at
25
′, and a clamp or clamps at
200
′.
Referring to the plan view of
FIG. 4
, spindle
10
having axis
12
is adjustable in X-Y directions as indicated, as by electrically or electronically numerically controllable drivers
60
and
61
. Those drivers are operated to very accurately position the spindle axis
12
relative to the axis
62
of the cone defined by the angled slide
27
, clamped to the machine bed, as described above. The position of the latter (and specifically cone axis
62
) is therefore fixed relative to machine bed
25
. For example spindle axis
12
is bodily displaced into coincidence with axis
62
. See the broken line position
10
″ of the aligned spindle.
In this regard, the spindle is first displaced in the X-direction, i.e. to position
10
′, at which a gauge
64
carried by the spindle or its carrier body engages a guide surface
65
, stopping further X-direction movement by drive
60
. That surface
65
is carried by the support
22
, clamped to the machine bed
25
. Guide surface
65
extends in the Y-direction, as shown; and the spindle is then displaced by driver
61
in the Y-direction to position
10
″. The guide surface
65
is integral with mount
28
for the angled slide
27
. Gauge
64
may also be used to engage a surface
66
carried by support
25
or mount
28
, at which time axis
12
coincides with cone axis
62
. Accordingly, advantage is taken of the accuracy of numerically controlled movement of the spindle, in X and Y directions, to achieve coincidence of axes
62
and
12
, required for accurate grinding of the spindle taper.
To recapitulate the method of the invention includes the step of adjusting the spindle to bring the spindle bore into position to be ground by the grinder
31
a
as the grinder is moved on angled slide
27
relative to the bore, and as the spindle
10
rotates. This can be accomplished by providing a guide surface, as described, and integral with the support, adjusting of the spindle including moving the spindle in a first direction toward that guide surface, which extends in a second direction; and then moving the spindle lengthwise of the guide surface and in said second direction, to bring the spindle bore into position to the ground, by rotary grinder
31
a
on the angled slide
27
.
Portability of the apparatus is enhanced by provision of a portable package that includes a minimum of elements (and therefore minimum weight), comprising the support
22
, the angled slide
27
, the rotary grinder
31
, and the guide surface
65
.
Claims
- 1. An improved method of grinding the bore of a rotary spindle, said bore having a taper, to true said bore while the spindle rotates about a spindle axis, the steps that include:a) providing a support attachable to a base associated with said spindle, b) providing an angled slide on said support, the slide being movable endwise relative to said spindle and at a predetermined angle to said axis, said angle corresponding to spindle bore taper, c) providing a rotary grinder on said angled slide to be movable endwise while the grinder rotates, d) bodily adjusting said spindle to bring said spindle bore into position to be ground by said grinder as the grinder is moved on said angled slide relative to the bore, and as the spindle rotates, e) operating said grinder to grind said tapered bore as the spindle is rotated and as said angled slide is moved endwise at said predetermined angle.
- 2. The method of claim 1 including attaching said support to said base to enable said adjusting of the spindle relative to the support and grinder.
- 3. The method of claim 2 including providing a motor drive for said rotary grinder to rotate same, and supporting said motor drive on said slide.
- 4. The method of claim 1 wherein said grinder includes a grinding head, and said operating of said grinder includes moving said head along an angle defined by said rotating tapered bore.
- 5. The method of claim 1 including providing a guide surface integral with the support, said adjusting of the spindle including bodily moving the spindle in a first direction toward said guide surface, which extend s a second direction; and bodily moving the spindle lengthwise of said guide surface and in said second direction, to bring the spindle bore into position to the ground.
- 6. The method of claim 5 wherein said guide surface is provided to extend in said second direction substantially at right angles to said first direction, and including removably attaching the support to said base.
- 7. The method of claim 1 which includes providing a package which includes said support, said angled slide, and said rotary grinder, and transporting said package to the location of said spindle and said base, for performing the steps a)-e) of claim 1.
- 8. The method of claim 5 which includes providing a package which includes said support, said slide, said rotary grinder and said guide surface, and transporting said package to the location of said spindle and said base, for performing the steps a)-e) of claim 1.
- 9. The method of claim 5 wherein said step of bringing the spindle bore into position to be ground comprises aligning the axis of the spindle with the axis of a cone defined by the angled slide.
- 10. Apparatus for grinding the bore of a rotary spindle, said bore having a taper, to true said bore while the spindle rotates, comprisinga) a support attachable to a base associated with the spindle, b) an angled slide on the support, the slide being movable endwise relative to said spindle and at a predetermined angle to said axis, said angle corresponding to spindle bore taper, c) a rotary grinder on said angled slide to be movable endwise therewith while the grinder rotates, d) the spindle being bodily adjustable in two dimensions into a position enabling grinding of the spindle tapered bore by the grinder as the grinder is moved on said angled slide relative to said bore, and as the spindle rotates, e) said grinder then operable to grind said tapered bore as the spindle is rotated and as said angled slide is moved endwise at said predetermined angle, f) and including a guide surface integral with the support, said guide surface being free of attachment to the spindle, one of said two dimensions being a direction extending toward said guide surface, and the other of said two dimensions extending lengthwise of said guide surface, the spindle adjustment in said second direction guided by said guide surface whereby the spindle has successive locations along said second direction as it is moved toward said position.
- 11. The combination of claim 10 wherein the support, said angled slide and said rotary grinder define a portable package transportable to the site of the spindle.
- 12. The combination of claim 10 including a retainer removably retaining the support to said base, which is fixed.
US Referenced Citations (17)
Foreign Referenced Citations (2)
Number |
Date |
Country |
204958 |
Dec 1986 |
EP |
1246151 |
Oct 1960 |
FR |