U.S. patent application number 14/616236 was filed with the patent office on 2015-11-19 for vibration stop device.
The applicant listed for this patent is Matsuura Machinery Corporation. Invention is credited to Koichi Amaya, Syuji Iizuka, Kiyotaka Iwai.
Application Number | 20150328748 14/616236 |
Document ID | / |
Family ID | 52394122 |
Filed Date | 2015-11-19 |
United States Patent
Application |
20150328748 |
Kind Code |
A1 |
Amaya; Koichi ; et
al. |
November 19, 2015 |
Vibration Stop Device
Abstract
A vibration stop device that can prevent a problem caused by
intrusion of a pressure contact region of a holding part of the
vibration stop device into a recess of a processing region of a
work includes a plurality of holding parts for the vibration stop
which hold an outer circumferential surface of a columnar work in a
process stage under a pressure contact state with pressure supplied
from a hydraulic cylinder, and a pressure contact position on the
outer circumferential surface is changed by rotation of the work,
and an angular range formed by opposite ends of each of the holding
parts for the vibration stop is larger than an angular range of the
processing region regarding an angular range based on a position of
an axis of the rotation.
Inventors: |
Amaya; Koichi; (Fukui City,
JP) ; Iizuka; Syuji; (Fukui City, JP) ; Iwai;
Kiyotaka; (Fukui City, JP) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Matsuura Machinery Corporation |
Fukui City |
|
JP |
|
|
Family ID: |
52394122 |
Appl. No.: |
14/616236 |
Filed: |
February 6, 2015 |
Current U.S.
Class: |
269/30 ;
269/34 |
Current CPC
Class: |
B23Q 3/08 20130101; B23Q
3/082 20130101; B23Q 1/76 20130101; B25B 5/147 20130101; B25B 5/064
20130101 |
International
Class: |
B25B 5/06 20060101
B25B005/06; B23Q 3/08 20060101 B23Q003/08; B25B 5/14 20060101
B25B005/14 |
Foreign Application Data
Date |
Code |
Application Number |
May 19, 2014 |
JP |
2014-103625 |
Claims
1. A vibration stop device comprising: a vibration stop device
including a plurality of holding parts for a vibration stop for
holding an outer circumferential surface of a columnar work in a
process stage under a pressure contact state with pressure supplied
from a hydraulic cylinder, and wherein a pressure contact position
on the outer circumferential surface is changed by rotation of the
work, and an angular range around the work which is formed by two
opposite ends of each of the holding parts for the vibration stop
is larger than an angular range of a processing region of the work
based on a position of an axis of the rotation.
2. The vibration stop device according to claim 1, wherein the
holding parts for the vibration stop each have an arc shaped
surface on a pressure contact side thereof, and a radius of
curvature of the arc is the same as a radius of curvature of the
work.
3. The vibration stop device according to claim 1, wherein the
holding parts for the vibration stop each have an arc shaped
surface on a pressure contact side thereof, and a radius of
curvature of the arc is larger than a radius of curvature of the
work.
4. The vibration stop device according to claim 1, wherein the
holding parts for the vibration stop each have a flat surface on a
pressure contact side thereof.
5. The vibration stop device according to claim 1, wherein a pair
of the holding parts for the vibration stop comes into pressure
contact with two sides of the work, and the two sides of the work
are rotatably connected to the pair of the holding parts for the
vibration stop, and further comprising a pressure transmission part
which is interlocked with a single hydraulic cylinder for
approaching and separating of the holding parts for the vibration
stop to and from the work by changing oil pressure.
6. The vibration stop device according to claim 1, wherein the
holding parts for the vibration stop are each independently
interlocked with a hydraulic cylinder for approaching and
separating of the holding parts for the vibration stop to and from
the work by changing oil pressure.
7. The vibration stop device according to claim 6, wherein there
are three said holding parts for the vibration stop.
8. The vibration stop device according to claim 1, further
comprising a hydraulic circuit for supplying pressure to achieve
the pressure contact, the hydraulic circuit including a relief
valve in juxtaposition with a solenoid valve for supplying oil
pressure to the vibration stop device.
Description
TECHNICAL FIELD
[0001] The present invention is relates to a vibration stop device
necessary for stopping vibration of a work in a process stage.
BACKGROUND OF THE INVENTION
[0002] Accurate processing on a work in a process stage requires
the work to be prevented from vibrating.
[0003] The work is divided into a processing region and a
non-processing region along a circumferential direction, and in
many cases, moves together with a main shaft in a state where a
holding part for vibration stop is in pressure contact with an
already processed region of the work.
[0004] As shown in FIG. 5, in the pressure contact state of the
holding part of a prior art, a pressure contact region is too
small. Thus, it cannot be avoided to make a partial region of the
holding part come into pressure contact.
[0005] On the other hands, the pressure contact state causes a
problem that the pressure contact region of the holding part
intrudes into a region recessed by the processing, in the other
words, in a recess, and even if the work is to be rotated along a
columnar center axis for the next processing, such rotation is
hindered due to the intrusion.
[0006] However, in the prior art, no particular countermeasure has
been taken for the problem caused by the pressure contact region of
the holding part intruding into the recesses that has been formed
by the processing.
[0007] For reference, Patent Document 1 describes, regarding a
camshaft work to be ground, a processing region and vibration stop
for the work, nevertheless has no particular description on the
relationship between the processing region and the vibration
stop.
[0008] Patent Document 2 describes both processing on a work and a
vibration stop device, but does not describe the problem arising
when the pressure contact region comes into contact with the region
that has already been processed.
PRIOR ART DOCUMENT
Patent Document
[0009] Patent Document 1: JP 2005-169530 A
[0010] Patent Document 2: JP 2010-99746 A
SUMMARY OF THE INVENTION
Problems to be Solved by the Invention
[0011] An object of the present invention is to provide a
configuration of a vibration stop device that can prevent a problem
caused by a pressure contact region of a holding part of the
vibration stop device intruding into a recess of a region that has
been processed.
Effect of the Invention
[0012] To achieve the object, the present invention has the
following basic structure: [0013] A vibration stop device, a
plurality of holding parts for vibration stop holds an outer
circumferential surface of a columnar work in a process stage under
a pressure contact state with pressure supplied from a hydraulic
cylinder, and pressure contact position on the outer
circumferential surface is changed by rotation of the work, [0014]
wherein an angular range formed by both ends of each of the holding
parts for vibration stop is larger than an angular range of a
processing region regarding an angular range based on a position of
an axis of the rotation.
[0015] In the present invention having the basic structure, the
pressure contact region of the holding part of the vibration stop
device never introduces into the recess in the processing region,
and so, the problem in the rotation of the work due to the
intrusion can be prevented.
[0016] Moreover, in the examples described later, the position of
the holding parts can be independently adjusted, whereby the
precision error of the work can be easily corrected.
BRIEF DESCRIPTION OF DRAWINGS
[0017] FIG. 1 is a side cross-sectional view of a first
embodiment.
[0018] FIG. 2 is a side cross-sectional view of a second
embodiment.
[0019] FIG. 3 is a side cross-sectional view of a third
embodiment.
[0020] FIG. 4 is a side cross-sectional view of a vibration stop
device of an example 1, and also includes a block diagram showing a
configuration of an oil pressure supplying device of an example
2.
[0021] FIG. 5 is a side cross-sectional view of a configuration of
a vibration stop device of the prior art.
DETAILED DESCRIPTION
[0022] As described in the basic structure, the present invention
has a feature that, regarding the angular range based on a position
of an axis of rotation of a columnar work 2, an angular range
formed by both ends of each of a holding part for vibration stop 11
is larger than an angular range of a processing region 21.
[0023] The basic structure can be embodied in a number of ways.
FIGS. 1 to 3 show typical embodiments.
[0024] FIG. 1 shows the first embodiment having a feature that a
holding part has an arc shaped surface on the pressure contact
side, and a radius of curvature of the arc is the same as the
radius of the work 2.
[0025] In the first embodiment, pressure contact can be done mainly
at a non-processing region 22.
[0026] Of course a holding part for vibration stop 11 never
intrudes into a recess of the processing region 21 that has already
been processed.
[0027] FIG. 2 shows the second embodiment having a feature that the
holding part for vibration stop 11 has an arc shaped surface on the
pressure contact side, and a radius of curvature of the arc is
larger than the radius of the work 2.
[0028] FIG. 3 shows the third embodiment having a feature that the
holding part for vibration stop 11 has a flat surface on the
pressure contact side.
[0029] In the second and third embodiments, the surface of the
holding part for vibration stop 11 on the pressure contact side
might come into contact with or come close to a surface of the
processing region 21, as shown in FIGS. 2 and 3. However, also in
these embodiments, as shown in FIGS. 2 and 3, the holding part for
vibration stop 11 never intrudes into the recess of the processing
region 21 as in the first embodiment. This is because the angular
range formed by both ends of each of the holding part for vibration
stop 11 is formed to be larger than an angular range of the
processing region 21.
[0030] As shown in FIGS. 1 to 3, in each of the first, second, and
third embodiments, a pair of the holding parts for vibration stop
11 comes into pressure contact with both sides of the work 2, and
the two sides of the work 2 are rotatably connected to the pair of
the holding parts for vibration stop 11, and a pressure
transmission part 12 which is interlocked with a single hydraulic
cylinder 31 is provided, such that approaching and separating of
the holding parts for vibration stop 11 to and from the work 2 are
achieved by changing oil pressure.
[0031] In the first embodiment, even when the entire processing
region 21 is formed into the recess as shown in FIG. 1, the holding
parts for vibration stop 11 are in pressure contact with both sides
of the non-processing regions 22 and at least four pressure contact
regions are formed. Thus, unlike the conventional technique shown
in FIG. 5, the holding part for vibration stop 11 for directly
transmitting the oil pressure from the hydraulic cylinder 31 is not
required to be provided in addition to the holding parts for
vibration stop 11 for sandwiching the work 2 from both sides.
[0032] However, in the second and third embodiments, as shown in
FIGS. 2 and 3, the holding parts for vibration stop 11 are not
necessarily in pressure contact with both sides of the
non-processing regions 22. When the depth of the recess of the
processing region 21 is very small, the pressure contact is made on
two positions of the processing regions 21, and so the pressure
contact state is achieved at substantially two points. Thus, as
shown in FIGS. 2 and 3, the third holding part for vibration stop
11 that directly presses and comes into pressure contact with the
work 2 by the pressure from the hydraulic cylinder 31 may be
provided.
[0033] The first embodiment does not require the third holding part
for vibration stop 11, and thus can achieve a simpler design and
lower cost compared with the second and third embodiment.
[0034] However, the first embodiment requires the holding parts for
vibration stop 11 having radii of curvature respectively
corresponding to the various radii of the works 2, and thus is more
cumbersome than the second and third embodiment in this point.
[0035] Examples are described as follows:
EXAMPLES
Example 1
[0036] As shown in FIG. 4, the example 1 has a feature that the
holding parts for vibration stop 11 are each independently
interlocked with a hydraulic cylinder 31, and approaching and
separating of the holding parts for vibration stop 11 to and from
the work 2 are achieved by changing the oil pressure.
[0037] When a precision error occurs in the work 2, the pressure
contact state created by a vibration stop device needs to be
immediately released, and the processing region 21 where the
precision error has occurred needs to be rotated to an operation
position on a main shaft side.
[0038] In such a case, the conventional technique shown in FIG. 5
and the embodiments shown in FIGS. 1 to 3 require cumbersome
control such as an operation of the pressure transmission part 12,
and movement of the third holding part for vibration stop 11.
[0039] In the example 1, the rotation state can be achieved by
immediately releasing, from each of the holding parts for vibration
stop 11, pressure supplied from the hydraulic cylinder 31, and the
precision error can be quickly corrected.
[0040] In many cases, a number of the holding parts for vibration
stop 11 and a number of the hydraulic cylinders 31 shown in the
example 1 are each three.
Example 2
[0041] As shown in FIG. 4, the example 2 has a feature that a
relief valve 34 is provided in juxtaposition with the solenoid
valve 33 which supplies the oil pressure to the vibration stop
device, in a hydraulic circuit that creates the pressure contact
state.
[0042] Specifically, a hydraulic cylinder 31, a pressure reducing
valve 32 for adjusting the pressure, and the solenoid valve 33 for
turning ON and OFF transmission of reduced pressure are used as in
the conventional technique, and the relief valve 34 in parallel
with an oil pressure circuit is further provided.
[0043] In the example 2 described above, even if the vibrating
state of the work 2 is changed and consequently the amount of
pressure required for the pressure contact of the holding part for
vibration stop 11 changes by turning ON the relief valve 34, the
change in the pressure can be compensated by the relief valve 34
turning on, so that the pressure transmitted to the hydraulic
cylinder 31 can be reduced as much as possible.
APPLICABILITY OF THE INVENTION
[0044] Thus, the present invention can achieve the vibration stop
without the problem of intrusion into the recess of the processing
region, and can quickly correct the precision error, and thus is
extremely useful.
EXPLANATION OF REFERENCE NUMERALS
[0045] 1 vibration stop device [0046] 11 holding part for vibration
stop [0047] 12 pressure transmission part [0048] 2 work [0049] 21
processing region [0050] 22 non-processing region [0051] 3 oil
pressure transmission device [0052] 31 hydraulic cylinder [0053] 32
pressure reducing valve [0054] 33 solenoid valve [0055] 34 relief
valve [0056] 35 oil pressure supply part
* * * * *