JP2002370143A - Centerless grinder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a centerless grinder capable of simplifying the whole structure and lowering manufacturing cost. SOLUTION: A centerless grinder has a blade 14 supporting a cylindrical work W, a regulating grinding wheel 17 rotated by coming in contact with one side of the circumferential surface of the work W and a grinding wheel 18 rotated by coming in contact with the circumferential surface of the work W from the direction opposite to the regulating grinding wheel 17. Between the grinding wheel 18 and the regulating grinding wheel 17, a dressing device 21 is disposed above the blade 14 so as to move to a dressing position and a retreating position. This dressing device 21 is equipped with a first dresser 22 for dressing the grinding wheel 18 and a second dresser 23 for dressing the regulating grinding wheel 17.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a centerless grinding machine for supporting a cylindrical work such as a ferrule used as a connector component of an optical fiber from its outer periphery and grinding the outer peripheral surface of the work. It is.

[0002]

2. Description of the Related Art As this kind of centerless grinding machine, for example, one having a configuration as shown in FIG. 10 is known. In this conventional configuration, a table 42
Are movably supported, and a blade 43 and an adjustment grinding wheel 44 are disposed on the table 42. And
A cylindrical or columnar work W is placed on the blade 43.
Is supported, and the adjusting wheel 44 is brought into contact with one outer peripheral surface of the work W. A grinding wheel 45 is movably disposed on the apparatus frame 41b, and the table 42 and the grinding wheel 45 are moved in the approaching direction to each other, so that the grinding wheel 45 is on the opposite side to the adjustment wheel 44. From the outer peripheral surface of the work W. Then, in this state, the grinding wheel 45
The rotation of the adjusting wheel 44 and the work W
Is ground.

[0003] The first dressing device 4 is attached to the grinding wheel 45.
6 are disposed so as to be able to advance and retreat and to be movable in the axial direction of the grinding wheel 45. Then, while the dresser 46a of the first dressing device 46 advances to the grinding wheel 45 side and is in contact with the grinding wheel 45, the grinding wheel 45 is rotated, and the first dressing device 46 It is moved in the axial direction of the vehicle 45. By this rotation and movement, the outer peripheral surface which is the grinding surface of the grinding wheel 45 is dressed.

A second dressing device 47 is opposed to the adjusting grinding wheel 44 so as to be able to advance and retreat and to be movable in the axial direction of the adjusting grinding wheel 44. And this second dressing device 4
In a state in which the dresser 47a advances to the adjustment grinding wheel 44 side and is in contact with the adjustment grinding wheel 44, the adjustment grinding wheel 44 is rotated, and the second dressing device 47 is rotated by the adjustment grinding wheel 44.
In the direction of the axis. By this rotation and movement, the outer peripheral surface of the adjustment grinding wheel 44 is dressed.

A mechanism for moving the dressing devices 46 and 47 back and forth and a mechanism for moving the grinding wheel 45 and the adjustment wheel 44 in the axial direction are not shown.

[0006]

As described above, in this conventional centerless grinding machine, two dressing devices 46 and 47 are provided so as to correspond to the grinding wheel 45 and the adjusting wheel 44, respectively. Have been. For this reason, there has been a problem that the structure of the entire grinding machine becomes complicated and the manufacturing cost increases.

The present invention has been made by paying attention to such problems existing in the prior art. An object of the present invention is to provide a centerless grinding machine capable of simplifying the entire structure and reducing manufacturing costs.

[0008]

In order to achieve the above-mentioned object, the invention according to the first aspect is characterized in that a blade supporting a cylindrical work and a blade contacting the outer peripheral surface of the work from one side are rotated. In the centerless grinding machine provided with an adjusting wheel and a grinding wheel that is rotated while being in contact with the outer peripheral surface of the work from the side opposite to the adjusting wheel, a dressing device is provided between the grinding wheel and the adjusting wheel. It is characterized by being arranged.

Therefore, according to the present invention, the dressing device can dress both the grinding wheel and the adjusting wheel. Therefore, it is not necessary to provide a dressing device for both the grinding wheel and the adjusting wheel, and a single dressing device may be provided. Therefore, the structure of the entire grinding machine can be simplified, and the manufacturing cost can be reduced.

According to a second aspect of the present invention, in the first aspect of the present invention, the dressing device is movably disposed above a blade between a dressing position and a retreating position. Things.

Therefore, according to the second aspect of the present invention, when grinding the work, the dressing device can be moved to the retracted position to avoid interference with the work or the like.
Therefore, even if the dressing device is disposed between the grinding wheel and the adjusting wheel, there is no problem in the grinding operation.

According to a third aspect of the present invention, in the first or second aspect, the dressing device includes a first dresser for dressing a grinding wheel and a dresser for dressing an adjusting wheel. And a second dresser.

Therefore, according to the third aspect of the present invention, it is possible to provide a dresser adapted to each of the grinding wheel and the adjusting wheel, so that each of the grinding wheel and the adjusting wheel can be efficiently and highly accurately formed. Can be dressed in.

According to a fourth aspect of the present invention, in the first aspect of the present invention, the dressing device discharges the work from between the grinding wheel and the adjusting wheel. And a work discharge device for the work.

Therefore, according to the present invention, the work can be reliably discharged from between the grinding wheel and the adjusting wheel by the work discharge device during the grinding of the work, and the work caused by the work getting caught or the like can be ensured. Accuracy can be prevented from lowering.

According to a fifth aspect of the present invention, in the fourth aspect of the present invention, the work discharge device can be disposed at an operation position and a retracted position. Therefore, at the time of dressing or the like, the work discharge device can be arranged at a retracted position that does not hinder dressing.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) A first embodiment of the present invention will be described below with reference to FIGS.

As shown in FIGS. 1 and 2, a table 12 is supported on an apparatus frame 11. The table 12 is moved in the left-right direction in FIG. 1 by a movement motor 13 via a ball screw (not shown). A blade 14 is disposed on the table 12, and an upper end thereof is formed with an inclined support surface 14a for supporting a cylindrical or columnar work W such as a ferrule used as an optical fiber connector component. ing.

An adjusting wheel support 15 is movably supported on the upper surface of the table 12, and is rotated by a rotation of a feed handle 16 so that a blade 14 is inserted through a ball screw (not shown).
It is designed to be moved in the direction of coming and going. The adjustment wheel 17 is supported on the adjustment wheel support 15.
The adjusting grinding wheel 17 is configured by mixing abrasive grains with a base made of an elastic material such as rubber. The adjustment wheel 17 is rotated by an adjustment wheel motor (not shown) in a state where the adjustment wheel 17 is in contact with the outer peripheral surface of the work W on the blade 14 from one side. In this case, the adjustment wheel 17 for the workpiece W is operated by operating the handle 16.
Is adjusted. The inclined support surface 14a is inclined downward toward the adjustment wheel 17 side.

Another device frame 1 on the device frame 11
1b, a grinding wheel support 19 is supported by a motor 38 so as to be movable in a direction of coming and going with respect to the adjusting wheel support 15. The grinding wheel 18 is supported by the grinding wheel support 19. Have been. The grinding wheel 18 is configured by mixing abrasive grains with a base made of, for example, ceramic. And, by the forward movement of the table 12,
In a state in which the outer peripheral surface of the work W on the blade 14 is in contact with the grinding wheel 18 from the side opposite to the adjusting wheel 17,
The grinding wheel 18 is rotated by the grinding wheel motor 20. By this rotation, the outer peripheral surface of the work W is ground. In this case, the forward movement position of the table 12 and the grinding wheel support 19 is determined according to the diameter of the work W, and the distance between the grinding wheel 18 and the adjusting wheel 17 is adjusted to the diameter of the work W. Is set.

As shown in FIGS. 5 and 6, in this embodiment, the rotation axis L2 of the grinding wheel 18 is located in a horizontal plane. Also, the rotation axis L1 of the adjustment grinding wheel 17 is parallel to the axis of the grinding wheel 18 when viewed from above, and descends to the workpiece W feed side with respect to the axis of the grinding wheel 18 when viewed from the side. Inclined, a feed angle is formed. By this feed angle, a through feed is provided between the grinding wheel 18 and the adjusting wheel 17 along the axial direction of the grinding wheel 18 to the work W.

As shown in FIGS. 1 and 2, a dressing device 21 moves between a grinding wheel 18 and an adjusting wheel 17 above a blade 14 to a lower dress position and an upper retreat position. It is arranged as possible. The dressing device 21 includes a first dresser 22 and a second dresser 23, and the first dresser 22 is located above the second dresser 23. Then, in a state where the dressing device 21 is moved from the upper evacuation position to the lower dress position, the outer peripheral surface of the grinding wheel 18 is dressed by the first dresser 22, and the adjustment wheel 17 is adjusted by the second dresser 23. The outer peripheral surface is to be dressed.

That is, a bracket 24 is erected on the grinding wheel support 19, and a moving frame 25 is supported on the side surface thereof via a guide rail 26 so as to be movable in the axial direction of the grinding wheel 18. I have. The movement of the moving frame 25 in the axial direction is performed by a moving motor 27 via a ball screw (not shown). A lifting frame 28 is supported on the side surface of the moving frame 25 so as to be able to move up and down. The lifting frame 28 is moved up and down by a lifting motor 29 via a ball screw (not shown).

The first dresser 22 and the second dresser 23 are attached to both lower ends of the elevating frame 28, and the elevating frame 28 is moved up and down by the elevating motor 29. FIG.
4 and a lower dress position shown in FIG. In this dress position, each of the dressers 22 and 23 includes the grinding wheel 18 and the adjustment wheel 1
7, and in this state, both grinding wheels 18, 17
While the is rotating, the moving frame 25 is reciprocated by the moving motor 27 in the axial direction. By this reciprocating movement, the dressers 22 and 23 are reciprocated substantially in the axial direction along the outer peripheral surfaces of the grinding wheels 18 and 17 so that the outer peripheral surfaces of the grinding wheels 18 and 17 are dressed. I have.

As shown in FIGS. 1 and 2, an elevating cylinder 31 is attached to the elevating frame 28 of the dressing device 21, and a discharge member 3 is provided at the lower end of the piston rod.
2 are installed. When the grinding of the workpiece W is completed, the discharge member 32
Is lowered, and at this time, the discharging member 32 is moved in the direction of the grinding wheel by the moving motor 27 so that the grinding wheel 1 is moved.
The work W is discharged from between the adjusting wheel 8 and the adjusting wheel 17. The lifting cylinder 31 and the discharging member 3
2 constitutes a work discharge device 30.

When the workpiece W is ground, as shown in FIG. 3, both dressers 22, 23 of the dressing device 21 are moved to the upper retreat position together with the lifting frame 28 by the lifting motor 29. In this state, when the grinding of the workpiece W is completed, the discharging member 32 is
Is moved to the lower position. Then, in this state, the moving frame 25 is moved in the discharging direction by the moving motor 27, so that the discharging member 32 pushes out the workpiece W.
For this reason, the workpiece W includes the grinding wheel 18 and the adjusting wheel 17.
Between the first and second portions and in the discharge direction substantially along their axis.

Next, the operation of the centerless grinding machine configured as described above will be described. Now, when grinding the workpiece W in this centerless grinding machine, as shown in FIGS. 1 to 3, both dressers 22, 23 of the dressing apparatus 21 are moved to the upper retreat position by the lifting motor 29. Be placed.
Further, the table 12 and the grinding wheel support 19 are moved by the moving motor 13 and the motor 38, respectively, so that the adjusting wheel 17 and the grinding wheel 18 are at predetermined intervals to process the outer diameter of the work W. Moved closer. In this state, the work W is supplied between the grinding wheels 17 and 18 by a supply means (not shown) and supported on the blade 14, and the rotation of the grinding wheels 17 and 18 starts grinding the outer peripheral surface of the work W. .

At the time of grinding the work W, the adjusting wheel 1
With the feed angle of 7, the workpiece W is moved while being ground along the axial direction of the grinding wheel 18. Then, when the workpiece W reaches the discharge-side end between the grinding wheels 17, 18, the discharge member 32 is moved to the lower position by the lifting cylinder 31 as shown in FIG. Then, in this state, the discharge member 32 is moved in the discharge direction by the moving motor 27, and the work W is discharged from between the grinding wheel 18 and the adjusting wheel 17 substantially along the axis thereof.

As described above, when the workpiece W is continuously ground, the abrasive grains on the outer peripheral surfaces of the grinding wheel 18 and the adjusting wheel 17 are worn. In this case, as shown in FIG. 4, the discharge member 32 is moved to the upper inactive position by the lifting cylinder 31. In this state, the dressers 22 and 23 of the dressing device 21 are moved and arranged at the lower dress position by the elevating motor 29, and the outer peripheral surfaces of the grinding wheel 18 and the adjusting wheel 17 are dressed.

That is, in the dressing of the adjusting grinding wheel 17, the adjusting grinding wheel 17 moves forward until it comes into contact with the second dresser 23 at the lowered position. In this state, the second dresser 23 is reciprocated in the axial direction of the grinding wheels 18 and 17 by the movement motor 27 while the adjusting grinding wheel 17 is rotated, and the outer peripheral surface of the adjusting grinding wheel 17 is dressed. In the dressing of the grinding wheel 18, the adjusting wheel 17 is retracted so as to be separated from the grinding wheel 18. In this state, the first dresser 22 descends until it comes into contact with the outer peripheral surface of the grinding wheel 18. In this state, while the grinding wheel 18 is rotating, the first dresser 22 is reciprocated in the axial direction of the grinding wheels 18 and 17 by the movement motor 27, and the outer peripheral surface of the grinding wheel 18 is dressed. .

Therefore, according to this embodiment, the following effects can be obtained. In this centerless grinding machine, a dressing device 21 is disposed between the grinding wheel 18 and the adjusting wheel 17. Then, both the grinding wheel 18 and the adjusting wheel 17 are dressed using the dressing device 21. For this reason, it is sufficient to provide a single dressing device 21. Therefore, a single motor for moving the dressing device 21 forward and backward and a peripheral mechanism therefor may be used, and the configuration can be simplified and the manufacturing cost can be reduced. can do.

In the centerless grinding machine, the dressing device 21 includes a work discharging device 30 for discharging the work W from between the grinding wheel 18 and the adjusting wheel 17. For this reason, the workpiece W can be reliably discharged from between the grinding wheel 18 and the adjusting wheel 17 by the workpiece discharging device 30 during the grinding of the workpiece W. That is, even if the feed angle is given to the adjustment grinding wheel 17, the workpiece W may not be discharged. And in such a case,
Although the portion located between the two grinding wheels 17 and 18 is excessively ground and the processing accuracy is reduced, in this embodiment,
Such a risk can be prevented beforehand.

(Second Embodiment) Next, a second embodiment of the present invention will be described with reference to FIG. 7 for parts different from the first embodiment.

In the second embodiment, the gap between the adjusting grinding wheel 17 and the grinding wheel 18 is narrowed to grind a small-diameter work W. Therefore, a thin blade is used as the blade 14. In addition,
In FIG. 7, for easy understanding, the distance between the adjusting wheel 17 and the grinding wheel 18 is wide, and the blade 14 is drawn thick.

One end of the blade 14 is fixed to a fixed part 50 of a part of the frame 11. A block 51 is fixed to the other end of the blade 14, and a screw hole 52 is formed in the block 51. On the other hand, a screw 54 is supported on the frame 11 via a bracket 53, and the screw 54 is screwed into a screw hole 52 of the block 51. Therefore, by tightening the screw 54, the blade 14 is tensioned.

On both front and rear sides of the processing space between the adjusting wheel 17 and the grinding wheel 18, guide plates 56 for guiding the entry and discharge of the work W are arranged. Therefore, in the second embodiment, the processing space between the adjusting wheel 17 and the grinding wheel 18 is narrow, and even if the blade 14 disposed therebetween is thin, the blade 14 is linearly tensioned. The workpiece W can be fed smoothly.

(Third Embodiment) Next, a third embodiment of the present invention will be described with reference to FIG. In the third embodiment, the feed angle of the adjusting grinding wheel 17 can be changed and adjusted.

That is, the arc surface 3 on the swivel table 34
The adjustment wheel support 15 is movably supported by 4a,
The adjustment wheel 17 is rotatably supported on the adjustment wheel support 15.

Then, the adjusting wheel support 15 is moved along the arc surface 34a of the turning table 34,
The feed angle of the adjustment grinding wheel 17 is changed and adjusted by being fixed at a predetermined rotation position with the plurality of bolts 36.

Therefore, according to the third embodiment, an optimum feed angle can be obtained according to the material and size of the work W. (Modification) This embodiment can be modified and embodied as follows.

In the second embodiment, the blade 1
4. Changing the configuration for tensioning. For example, as shown in FIG. 8, a rotating body 61 is rotatably supported on a frame 11 around a shaft 62, and
Screws 64 supported by the frame 11 are screwed into the pieces 63 protruding from the first. Therefore, in this configuration, by turning the screw 64, the rotating body 61 is rotated, and the blade 14 is tensioned. In addition, 1 here
Reference numeral 4 may be a wire or a wire made of a piano wire or the like.

The adjusting wheel 1 in each of the above embodiments.
Change to 7 which does not contain abrasive grains and does not have a grinding function. In this case, the grinding function is slightly reduced, but the other functions are the same as those in the above embodiments.

[0043]

As described above, as exemplified in each of the embodiments, the present invention does not require the provision of a plurality of dressing devices, and has the effect of simplifying the entire structure.

[Brief description of the drawings]

FIG. 1 is a front view showing a centerless grinding machine of a first embodiment.

FIG. 2 is an enlarged perspective view showing a part of the centerless grinding machine.

FIG. 3 is an enlarged front view of a main part showing a workpiece discharge state.

FIG. 4 is an enlarged front view of a main part showing the dress state.

FIG. 5 is a perspective view showing the relationship between the adjusting wheel and the grinding wheel.

FIG. 6 is a side view showing the relationship between the adjusting wheel and the grinding wheel.

FIG. 7 is a plan view showing a second embodiment.

FIG. 8 is a plan view showing a modification.

FIG. 9 is a plan view showing a third embodiment.

FIG. 10 is a front view showing a conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 11 ... Device frame, 12 ... Table, 14 ... Blade, 17 ... Adjusting grinding wheel, 18 ... Grinding wheel, 21 ... Dressing device, 22 ... 1st dresser, 23 ... 2nd dresser, 2
5 moving frame, 27 moving motor, 28 lifting frame, 29 lifting motor, 30 work discharger,
Reference numeral 31 denotes a lifting cylinder, 32 denotes a discharge member, L1 denotes an axis of an adjustment grinding wheel, L2 denotes an axis of a grinding wheel, and W denotes a work.

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Ichiro Yamaguchi 1 Shinmeicho, Yokosuka City, Kanagawa Prefecture Inside the Hihei Toyama Technical Center Co., Ltd. Terms (reference) 3C043 AA08 CC03 EE03 3C047 BB04 BB12

Claims (5)

[Claims] 1. A blade for supporting a cylindrical or columnar work, an adjusting wheel that is rotated by contacting the outer peripheral surface of the work from one side, and a blade that contacts the outer peripheral surface of the work from the opposite side to the adjusting wheel. A centerless grinding machine provided with a rotating grinding wheel, wherein a dressing device is disposed between the grinding wheel and the adjustment wheel. 2. The centerless grinding machine according to claim 1, wherein the dressing device is disposed above a blade so as to be movable between a dressing position and a retracted position. 3. The dressing device according to claim 1, wherein the dressing device has a first dresser for dressing a grinding wheel and a second dresser for dressing an adjusting wheel. Heartless grinding machine. 4. The dressing device according to claim 1, wherein the dressing device includes a work discharging device for discharging the work from between the grinding wheel and the adjusting wheel. A centerless grinding machine according to one of the preceding claims. 5. The centerless grinding machine according to claim 4, wherein the workpiece discharge device can be arranged at an operation position and a retracted position.