Vibration Stop Device
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.
The present invention is relates to a vibration stop device necessary for stopping vibration of a work in a process stage.
BACKGROUND OF THE INVENTIONAccurate processing on a work in a process stage requires the work to be prevented from vibrating.
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.
As shown in
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.
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.
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.
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 DocumentPatent Document 1: JP 2005-169530 A
Patent Document 2: JP 2010-99746 A
SUMMARY OF THE INVENTION Problems to be Solved by the InventionAn 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 InventionTo achieve the object, the present invention has the following basic structure:
-
- 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,
- 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.
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.
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.
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.
The basic structure can be embodied in a number of ways.
In the first embodiment, pressure contact can be done mainly at a non-processing region 22.
Of course a holding part for vibration stop 11 never intrudes into a recess of the processing region 21 that has already been processed.
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
As shown in
In the first embodiment, even when the entire processing region 21 is formed into the recess as shown in
However, in the second and third embodiments, as shown in
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.
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.
Examples are described as follows:
EXAMPLES Example 1As shown in
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.
In such a case, the conventional technique shown in
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.
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 2As shown in
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.
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 INVENTIONThus, 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
- 1 vibration stop device
- 11 holding part for vibration stop
- 12 pressure transmission part
- 2 work
- 21 processing region
- 22 non-processing region
- 3 oil pressure transmission device
- 31 hydraulic cylinder
- 32 pressure reducing valve
- 33 solenoid valve
- 34 relief valve
- 35 oil pressure supply part
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.
Type: Application
Filed: Feb 6, 2015
Publication Date: Nov 19, 2015
Inventors: Koichi Amaya (Fukui City), Syuji Iizuka (Fukui City), Kiyotaka Iwai (Fukui City)
Application Number: 14/616,236