KR20030081071A - Cylindrical grinding machine - Google Patents

Abstract

The present invention provides a preferable cylindrical grinding machine for improving the roundness of a cylindrical workpiece such as a ferrule, and the pressing force when pressing the rotary elastic roll 4 to the outer circumferential surface of the ferrule F is the pressing force setting means 16. It is assumed that it is set to be constant by). This pressing force setting means 16 dials the movement amount of the slide table 11 at the time when the rotational elastic roll 4 and the outer peripheral surface of the ferrule F contact as a result of the forward movement of the slide table 11, for example. At the time of confirming that the gauge 17 measures the measurement result of the dial gauge 17 has reached the reference value, the forward movement of the slide table 11 is stopped, whereby the dial gauge 17 The indentation elastic deformation amount of the rotary elastic roll 4 shall be set to a predetermined | prescribed set value based on the measurement result of t.

Description

Cylindrical Grinding Machine {CYLINDRICAL GRINDING MACHINE}

The present invention relates to a cylindrical grinding machine for carrying out external grinding of cylindrical workpieces such as ferrules used for optical fiber connector components, for example.

Conventionally, the structure of the embodiment shown in FIG. 7 and FIG. 8 is known regarding the cylindrical grinding machine which grinds the outer diameter of this kind of ferrule. In the cylindrical grinding machine M shown in these figures, the rotational elastic roll 4 has a ferrule (a state in which the ferrule F is rotatably supported by the fixed tail stock center 2 and the movable tail stock center 3). It is structured to be pressed by the outer peripheral surface of F). In the cylindrical grinding machine M comprised in this way, the ferrule F rotates by the rotary elastic roll 4 being pressed by the ferrule which rotates as mentioned above, and the ferrule F by the grinding wheel 15 Grinding of the outer diameter can be carried out.

By the way, the pressing force of the rotary elastic roll 4 needs to be adjusted and set to an appropriate value. This means that a slight change in the pressing force of the rotary elastic roll 4 is coaxial to the outer diameter portion of the ferrule F and the fiber insertion hole H of the ferrule F, or the outer diameter of the ferrule F. This is because it affects the roundness, the taper, and the like, that is, the outer diameter grinding precision of the ferrule F.

That is, the hole diameter (inner diameter of the fiber insertion hole H) of the ferrule F is phi 0.125 mm, and the diameters of the front ends of the centers 2 and 3 are smaller than this. From the relationship with such a tapered shape, such as the centers 2 and 3, the following problem is associated when pressing the rotating elastic roll 4 to the outer peripheral surface of the ferrule F. As shown in FIG. (1) If the pressing force of the rotary elastic roll 4 is too large, the fixed tail stock center 2 and the movable tail stock center 3 are likely to be damaged, and their wear is also quick. In addition, uneven wear of the fixed tail stock center 2 and the movable tail stock center 3, for example, uneven wear, causes non-uniformity in the rotation of the ferrule F, and the roundness of the ferrule F is deteriorated. (2) On the other hand, if the pressing force of the rotary elastic roll 4 is too small, the frictional resistance between the rotary elastic roll 4 and the outer circumferential surface of the ferrule F is reduced, and the ferrule F can no longer rotate smoothly. none. Moreover, nonuniformity arises in rotation of the ferrule F, and the roundness of the ferrule F deteriorates. In view of this, it is necessary to adjust and set the pressing force of the rotary elastic roll 4 to an optimum value.

However, in the related art, the adjustment and setting of the pressing force of the rotary elastic roll 4 described above are performed depending on the operator's experience and intuition. That is, conventionally, when an operator presses the rotational elastic roll 4 to the outer peripheral surface of the ferrule F, the rotational elastic roll (indentation elastic deformation amount of the rotational elastic roll 4 becomes a predetermined set value). By moving 4) forward, the pressing force of the rotary elastic roll 4 is adjusted and set. In this process, since the indentation elastic deformation amount of the rotary elastic roll 4 has reached the predetermined set value based on the operator's experience and intuition, the pressing force on the rotary elastic roll 4 is always set to the optimum value. It is difficult. If the pressing force deviates from the optimum value, problems such as breakage and premature wear of the fixed tail stock center (2) and the movable tail stock center (3), uneven rotation of the ferrule, and the resulting ferrule (F) Deterioration of roundness occurs.

In particular, as a means for improving the roundness improvement of the ferrule F, the technique of performing run-out removal grinding of the rotary elastic roll 4 in the grinding machine, that is, the same as the outer diameter grinding of the ferrule F, is the same. Although the technique of grinding the outer circumferential surface of the rotary elastic roll 4 with the grinding wheel 15 is disclosed in Japanese Patent No. 3171434, when the shake removal grinding of the rotary elastic roll 4 is performed in a grinding machine, the rotary elastic roll Since the indentation elastic deformation of the rotary elastic roll 4 when the rotary elastic roll 4 is pressed against the outer circumferential surface of the ferrule F changes due to the decrease in the outer diameter dimension of (4), before the shake removal grinding The rotary elastic roll 4 cannot be pressed against the outer circumferential surface of the ferrule F with an optimum pressing force equal to that, and the roundness of the ferrule F is deteriorated.

In addition, the outer diameter of the ferrule F is gradually reduced with the progress of the outer diameter grinding. Until now, such reduction in the outer diameter of the ferrule reduces the amount of indentation elastic deformation of the rotary elastic roll 4, thereby, for example, in the final stage of external grinding, the pressing force of the rotary elastic roll 4 is insufficient, and the ferrule Since smooth rotation of (F) is not obtained, the roundness of the ferrule F is thereby deteriorated.

The present invention is to solve the above problems. It is therefore an object of the present invention to provide a cylindrical grinding machine which can improve the roundness of a cylindrical workpiece such as, for example, a ferrule.

In order to achieve the above object, the cylindrical grinding machine according to the present invention has both center support means for rotatably supporting a cylindrical workpiece by a fixed tail stock center and a movable tail stock center, and is pressed against the outer peripheral surface of the cylindrical workpiece. A rotational elastic roll for imparting rotational force to the cylindrical workpiece, sliding means for sliding the rotary elastic roll back and forth with respect to an outer circumferential surface of the cylindrical workpiece, and holding the rotational elastic roll at a predetermined slide position, and the cylindrical shape. When pressing the rotating elastic roll to the outer circumferential surface of the cylindrical workpiece, and the grinding wheel grinding the outer circumferential surface of the cylindrical workpiece, adjacent to the outer circumferential surface of the cylindrical workpiece from the position facing the rotating elastic roll through the workpiece Press force setting to set the pressing force to a certain level. It is characterized by including a water purification stage.

In the present invention, by adopting the above-described configuration, even when the shake removal grinding of the rotary elastic roll is performed on the grinding machine, the rotary elasticity is set through the pressing force setting means without depending on the operator's experience and intuition as in the prior art. It is possible to optimally set the pressing force of the roll.

In the cylindrical grinding machine of the present invention, the pressing force setting means includes measuring means for measuring the amount of slide movement of the rotary elastic roll, and based on the measurement result in the measuring means, The structure which sets the indentation elastic deformation amount of this rotary elastic roll at the time of pressing a rotary elastic roll can be employ | adopted.

In the cylindrical grinding machine of the present invention, the pressing force setting means, when pressing the rotary elastic roll to the outer peripheral surface of the cylindrical workpiece, the pressing spring for biasing the rotary elastic roll in the pressing direction at a predetermined pressing force in the pressing direction. Cylindrical grinders may be employed having means, or other means biased at a certain pressing force.

In the cylindrical grinding machine of the present invention, a structure in which the rotating elastic roll is pressed against the outer circumferential surface of the cylindrical workpiece during rotation may be adopted.

In the cylindrical grinding machine of the present invention, a structure in which the rotational elastic roll is reversed in a state in which the rotational elastic roll is in contact with the outer circumferential surface of the cylindrical workpiece can be adopted.

In the cylindrical grinding machine of the present invention, the center support means includes a fixed tail stock center engaged with the inner diameter portion of the cylindrical workpiece on one surface side of the cylindrical workpiece, and the cylindrical workpiece on the other end surface side of the cylindrical workpiece. A structure having a movable tailstock center engaged with the inner diameter and pressing the cylindrical workpiece on the side of the fixed tail stock center, wherein the fixed tail stock center and the movable tail stock can rotatably support the cylindrical workpiece. .

In the cylindrical grinding machine of the said invention, a ferrule is contained in the cylindrical workpiece used for external grinding. This type of ferrule is in the form of a cylinder that passes through both ends of the fiber insertion hole. In the case of performing the outer diameter grinding of the ferrule, the fixed tail stock center is engaged with the fiber insertion hole which is the inner diameter of the ferrule at one surface side of the ferrule, and the movable tail stock is disposed at the other end surface side of the same ferrule. It is to be engaged with the fiber insertion hole which is the inner diameter part of a ferrule.

BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing of the cylindrical grinding machine which is one Embodiment of this invention.

FIG. 2 is a view in the direction of arrow B of FIG. 1.

3 is a cross-sectional view taken along the line A-A of FIG.

It is explanatory drawing at the time of pressing a rotating elastic roll on the outer peripheral surface of a ferrule.

It is explanatory drawing of the cylindrical grinding machine which is another embodiment of this invention.

FIG. 6 is a view in the direction of arrow C of FIG. 5.

7 is an explanatory view of a conventional cylindrical grinding machine.

FIG. 8 is a perspective view taken from the arrow D direction of FIG. 7.

<Explanation of symbols for the main parts of the drawings>

1: both center support means 2: fixed tail stock center

3: movable tail stock center 4: rotating elastic roll

5: roll spindle unit 6: roll drive motor

7: roll spindle 8: power transmission means

10: drive unit before and after roll (slide means)

11: slide table 12: stroke cylinder

13: piston rod 14: unified base

15: grinding wheel 16: pressing force setting means

17 dial gauge 18 support member

19: pressure spring 20: guide hole

21: guide member body 22: round hole

23: guide means

F: Ferrule

H: fiber insertion hole

S: measurement reference plane

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of the cylindrical grinding machine which concerns on this invention is described in detail based on FIG.

The cylindrical grinding machine M shown in FIG. 1 has both center support means 1, which have two centers consisting of a fixed tail stock center 2 and a movable tail stock center 3. And the ferrule F is carried in as a cylindrical workpiece which performs outer diameter grinding between these two centers 2 and 3.

In the state in which the ferrule F was carried in between the fixed tail stock center 2 and the movable tail stock center 3, the fixed tail stock center 2 has this ferrule F at one surface side of the ferrule F. ), The movable tail stock center 3 is configured to engage the fiber insertion hole H of the ferrule F at the other end surface side of the ferrule F. At the same time, the ferrule F is rotatably supported at both ends by the two centers 2 by the force of the spring (not shown).

The rotary elastic roll 4 is arrange | positioned at one side of the line L-L which connects the shaft of the fixed tail stock center 2 and the movable tail stock center 3.

The rotary elastic roll 4 has a structure in which the outer circumferential surface of the roll is pressed against the outer circumferential surface of the ferrule F, and the torque is transmitted to the ferrule F through this pressed adjacent portion. Moreover, the rotating elastic roll 4 is comprised from elastic members, such as rubber | gum, and is comprised so that it may rotate around the roll axis.

The rotary elastic roll 4 can be driven to rotate in various systems. In this embodiment, the system which rotationally drives the rotary elastic roll 4 by the roll spindle unit 5 and the roll drive motor 6 (refer FIG. 2) is employ | adopted.

That is, in the roll spindle unit 5, a roll spindle 7 rotatably supported is provided, and the rotary elastic roll 4 is integrally mounted coaxially to the tip end of the roll spindle 7. Moreover, the roll drive motor 6 is connected to the rear end of the roll spindle 7 via a power transmission means 8 made of a pulley, a belt, or the like.

When the roll drive motor 6 is operated, this motor torque is transmitted to the roll spindle 7 side through the power transmission means 8, whereby the rotary elastic roll 4 integrally with the roll spindle 7 rolls the roll. Rotate around the axis.

Moreover, the rotary elastic roll 4 can slide back and forth with respect to the outer peripheral surface of the ferrule F, and is hold | maintained in the predetermined slide position. Such slide movement operation of the rotary elastic roll 4 and holding operation of the slide position are performed by the roll back and forth drive unit 10 (slide means).

That is, in the cylindrical grinding machine M shown in FIG. 1, the whole roll spindle unit 5 including the rotational elastic roll 4, the roll drive motor 6, etc. are used as the slide table of the roll back and forth drive unit 10 ( 11) is mounted on the structure. As shown in FIG. 2, the slide table 11 of the roll back and forth drive unit 10 is connected to the piston 13 of the stroke cylinder 12 and is used for the forward and backward movement of the piston rod 13. By this, the unit base 14 can be moved back and forth. By the movement of the slide table 11 on the unit base 14, the rotary elastic roll 4 has a structure which can slide back and forth with respect to the outer peripheral surface of the ferrule F. As shown in FIG.

In addition, the piston rod 13 of the stroke cylinder 12 can be stopped at an arbitrary position in the course of its forward and backward operation. The stoppage of the piston rod 13 prevents the movement of the slide table 11, whereby the rotary elastic roll 4 is held in a predetermined slide position.

In short, the rotary roll back and forth drive unit 10 slides the rotary elastic roll 4 back and forth with respect to the outer circumferential surface of the ferrule F, and at the same time, retains the rotary elastic roll 4 at a predetermined slide position. It is configured to function as a slide means.

As shown in FIG. 1, the grinding wheel 15 is arrange | positioned at the other side of the line L-L which connects both center axis lines of the fixed tail stock center 2 and the movable tail stock center 3.

The grinding wheel 15 is provided at a position facing the rotary elastic roll 4 through the medium of the ferrule F, and the grinding wheel outer circumferential surface is in contact with the outer circumferential surface of the ferrule F at this position. Moreover, this grinding wheel 15 rotates around the grinding wheel shaft center and grinds the outer peripheral surface of the ferrule F. As shown in FIG. Moreover, the grinding wheel 15 is attached to the front end of a grinding spindle (not shown), and is driven to rotate by the rotation of the grinding wheel spindle.

In the cylindrical grinding machine M of FIG. 1 comprised as mentioned above, when performing outer diameter grinding of the ferrule F in the grinding wheel 15, it is ferrule by the fixed tail stock center 2 and the movable tail stock 3. In the state in which (F) is rotatably supported, in order to rotate this ferrule F, the rotary elastic roll 4 is pressed against the outer peripheral surface of the ferrule F. As shown in FIG. Means for setting the pressing force of the rotary elastic roll 4 (pressure setting means 16) are provided in the cylindrical grinding machine M shown in the drawing.

In the pressing force setting means 16, various apparatuses are considered regarding the method of setting the pressing force of the rotary elastic roll 4 to be constant. In the pressing force setting means 16 of the cylindrical grinding machine M shown in FIG. 1, the indentation elastic strain of the rotary elastic roll 4 at the time of pressing the rotary elastic roll 4 to the outer peripheral surface of the ferrule F is shown. Based on the relationship, the method of setting the pressing force of the rotational elastic roll 4 uniformly is employ | adopted.

That is, since the rotary elastic roll 4 is made of an elastic member, when the rotary elastic roll 4 is pressed against the outer circumferential surface of the ferrule F, the pressing surface of the rotary elastic roll 4 is as shown in FIG. It elastically deforms and becomes concave. The indentation elastic deformation amount ΔX is proportional to the pressing force of the rotary elastic roll 4. For this reason, when measuring the indentation elastic deformation amount (DELTA) X of the rotational elastic roll 4 at the time of pressing the rotational elastic roll 4 to the outer peripheral surface of the ferrule F, if the measured value is always the same value, if it is the same value, The rotary elastic roll 4 is pressed against the outer circumferential surface of the ferrule F. As shown in FIG.

In addition, since the slide spindle unit 5 including the rotary elastic roll 4 and the slide table 11 of the roll back and forth drive unit 10 are integral parts, the sliding movement amount of the rotary elastic roll 4 is a slide table. It is the same as the movement amount of (11).

For this reason, if the slide table 11 moves forward in the direction of the ferrule F in a state where the rotating elastic roll 4 is separated from the outer circumferential surface of the ferrule F, the rotating elastic roll 4 is moved by the same distance in the same direction. (4) also slides, and the rotary elastic roll 4 finally contacts the outer peripheral surface of the ferrule F. As shown in FIG.

When the slide table 11 is further moved forward after that, the rotary elastic roll 4 is pressed against the outer circumferential surface of the ferrule F, and the forward end portion (contact surface) side of the rotary elastic roll 4 is elastic by the pressing force. It deforms and is concave by the pressing force, and the slide table 11 is moved by this indentation elastic deformation amount ΔX.

Therefore, when the indentation elastic deformation of the rotary elastic roll 4 starts, that is, at the time of contact between the rotary elastic roll 4 and the outer peripheral surface of the ferrule F, the amount of movement of the slit table 11 measured (= rotary elastic roll) The slide movement amount of (4) is the same as the indentation elastic deformation amount (ΔX) of the rotary elastic roll 4.

From this point of view, in the pressing force setting means 16 of the cylindrical grinding machine M shown in FIG. 1, the rotary elastic roll is based on the measurement result (the amount of movement of the current slide table 11) by the dial gauge 16. The indentation elastic strain ΔX of (4) is set to be constant. More specifically, when the rotary elastic roll 4 and the outer peripheral surface of the ferrule F come into contact with each other by the forward movement of the slide table 11, the movement amount of the slide table 11 is measured by the dial gauge 17. At the same time, when it is confirmed that the measurement result in the dial gauge 17 has reached the reference value, the forward and backward movement of the slide table 11 is stopped.

In the case of this embodiment, about the measurement of the movement amount of the slide table 11 by the above-mentioned dial gauge 17, the measurement system performed in the back part of the slide table 11 of the back and front drive unit 10 of a roll is performed. I adopt it.

That is, this measurement method makes the rear side surface of the unit base 14 of the roll back and front drive unit 10 into a measurement reference plane S, and measures the movement amount of the slide table 11 when it sees from this measurement reference plane S. It is a method of measurement.

In relation to the above-described measurement method, in the cylindrical grinding machine M shown in FIG. 1, the dial gauge 17 is attached to the slide table 11 side via the support member 18 and at the same time, the attachment is performed. In the state, the distal end portion of the gauge head 17-1, which is pressed by the force of the spring (not shown) by the dial gauge 17, has a structure in contact with the measurement reference surface S as described above.

Therefore, when the slide table 11 exists in the position shown in FIG. 1, for example, the guide 17-2 (refer FIG. 3) of the dial gauge 17 is set to the initial value "0" of the scale (not shown). Reset to indicate. After that, when the slide table 17 is moved back in the direction of the arrow in the drawing, the dial gauge 17 is also retracted by the same distance in the same direction, but at this time, the gauge of the dial gauge 17 is moved by the retraction movement distance. While the head 17-1 is pressed by the force of the spring (not shown), the guide 17-2 of the dial gauge 17 rotates in association with the movement of the gauge head 17-1. At this time, the read value of the scale (not shown) of the guide 17-2 becomes the retreat movement amount of the slide table 11. The same applies to the measurement of the amount of advance movement of the slide table 11.

Next, the operation and the like of the cylindrical grinding machine shown in FIG. 1 will be described with reference to FIGS. 1 and 2.

(1) Preparation work of outer diameter grinding

[1] deburring grinding of resilient rolls

In the cylindrical grinding machine M shown in FIG. 1, in order to improve the roundness of the ferrule F by removing the shake of the rotary elastic roll 4 during external grinding, the rotary elastic roll 4 is shaken before external grinding. Removal grinding is done on the grinding machine. This shake removal grinding grinds the outer peripheral surface of the rotary elastic roll 4 by the same grinding wheel 15 as the outer diameter grinding of the ferrule F. As shown in FIG.

[2] pressing force sets for rotating elastic rolls

Next, in the cylindrical grinding machine M shown in FIG. 1, the adjustment work required in order to set the pressing force of the rotary elastic roll 4 to be constant is performed.

This adjustment work is first rotated by moving the slide table 11 forward in a state where the ferrule F is supported at both ends by the fixed tail stock center 2 and the movable tail stock center 3. The roll 4 is made to contact the outer peripheral surface of the ferrule F. As shown in FIG. The measurement of the movement amount of the slide table 11 by the dial gauge 17 is started from the moment when this contact is effective.

When the slide table 11 is further moved forward, as shown in FIG. 4, the forward end (contact surface) of the rotary elastic roll 4 in contact with the outer circumferential surface of the ferrule F is elastically deformed and concave. However, when this indentation elastic deformation amount ΔX becomes a predetermined set value, the forward movement of the slide table 11 is stopped, and the scale indicated by the guide 17-2 of the dial gauge 17 is read. . This scale reading value is an amount of movement of the slide table 11 measured at the time of contact between the outer peripheral surface of the ferrule F and the rotary elastic roll 4, that is, the indentation elastic strain ΔX of the rotary elastic roll 4, Moreover, in the outer diameter grinding of the ferrule F performed after that, it becomes a reference value for adjusting and setting the pressing force of the rotating elastic roll 4 to a predetermined | prescribed set value.

(2) outer diameter grinding

In the cylindrical grinding machine M shown in FIG. 1, when actually performing the outer diameter grinding of the ferrule F, first, the rotary elastic roll 4 is rotated in the direction opposite to the rotation direction of the grinding wheel 15 (hereinafter, This rotation is called "forward rotation," and the reverse rotation is called "reverse rotation." Further, the rotary elastic roll 4 is brought into light contact with the outer circumferential surface of the ferrule F by the forward movement of the slide table 11. At this contact, the dial gauge 17 starts to measure the movement amount of the slide table 11.

Next, the rotary elastic roll 4 is pressed against the outer peripheral surface of the ferrule F by further moving the slide table 11 forward. In this pressurization process, the measurement result (the amount of movement of the current slide table 11) in the dial gauge 17 is obtained by the above-mentioned preparatory step (the outer circumferential surface of the ferrule F and the rotary elastic roll 4). When the amount of movement of the slide table 11 measured at the time of contact is reached, the forward movement of the slide table 11 is stopped at this time.

By this arrangement, the forward end of the rotary elastic roll 4 pressed against the outer circumferential surface of the ferrule F is disposed at the same position as the preparation operation step, and the indentation elastic deformation of the rotary elastic roll 4 by the pressing force. Since ΔX becomes the same as the preparatory work step, the pressing force of the rotary elastic roll 4 is adjusted and set to a predetermined value which is approximately equal to the state of the preparatory work step.

And in the cylindrical grinding machine M shown in FIG. 1, after adjusting and setting the pressing force of the rotational elastic roll 4 to a predetermined value through the above-mentioned dial gauge 17, the outer peripheral surface of the ferrule F is ground. Outer diameter grinding performed by the grindstone 15 is performed.

Therefore, according to the cylindrical grinding machine M shown in FIG. 1, even when the shake removal grinding of the rotary elastic roll 4 was performed on a grinding machine in (1) preparatory work, it does not depend on the experience and intuition of a conventional operator. Instead, the pressing force of the rotary elastic roll 4 can be appropriately set through the dial gauge 17, and the state by which the pressing force deviates from an optimum value, for example, the fixed tail stock center 2 and the movable tail stock center 3 ), Premature wear, abnormal wear, uneven rotation of the ferrule F, and the like, and the roundness of the ferrule F is improved.

Here, the fiber insertion hole (H) of the ferrule (F) in which the fixed tail stock center (2) and the movable tail stock center (3) are interlocked is originally installed to insert the optical fiber, and the fixed tail stock center (2) and Since it is not installed to interlock the movable tail stock center 3, in some cases the insertion engagement of the fixed tail stock center 2 and the movable tail stock center 3 into the fiber insertion hole H is incomplete, The clamp support posture of the ferrule F by both centers 3 may not be stable.

In this case, the rotary elastic roll is brought into light contact with the outer circumferential surface of the ferrule F, and after the ferrule F starts to rotate, the direction of rotation of the rotary elastic roll 4 is reversed, thereby rotating the ferrule F. Invert That is, the rotation direction is changed from forward rotation to reverse rotation, or reverse rotation to forward rotation. At this time, the timing in which the rotation direction is reversed is not limited, but may be any timing as long as it is within the time from the start of the rotation of the ferrule F to the grinding wheel 15 coming into contact with the workpiece. Moreover, if it is in the said time, you may repeat inversion of a rotation direction many times. Then, after performing the said operation | movement which adjusts and sets the pressing force to a predetermined value on the outer peripheral surface of the ferrule F, the rotating elastic roll 4 may be rotated forward.

When the rotation operation of the rotational elastic roll 4 as described above is inverted, the rotation direction of the ferrule F is also inverted based on the rotation reversal operation. However, the fixed tail stock center ( 2) and the movable tail stock center 3 can be accurately engaged with the fiber insertion hole H, whereby the clamp supporting posture of the ferrule F by the centers 2 and 3 is stabilized. The cylindricality of the ferrule F can be improved.

(3) Instructions in preparation work of outer diameter grinding

In the preparation work for outer diameter grinding (1), the rotary elastic roll 4 is pressed against the outer peripheral surface of the ferrule F. In this process, the rotary elastic roll 4 must be pressed against the outer circumferential surface of the ferrule F while rotating around its roll axis. This is to improve the cylindricality of the ferrule F by outer diameter grinding.

That is, when the rotating elastic roll 4 at rest is directly pressed directly on the outer circumferential surface of the ferrule F, the indentation due to the pressing force is generated on the rotating elastic roll 4 side. Because of this indentation, the rotational accuracy of the ferrule F is deteriorated, for example, a nonuniformity occurs in the rotation of the ferrule F, and therefore, there is a high possibility that a decrease in the cylindricality of the ferrule F due to outer diameter grinding occurs. In contrast, in the case of the structure that presses the outer circumferential surface of the ferrule F while rotating the rotary elastic roll 4 as described above, during the set time of the pressing force of the rotary elastic roll 4 as described above, Since the pressing position of the rotary elastic roll 4 changes, it is difficult for the indentation due to the pressing force to be formed on the side of the rotary elastic roll 4, and the fall of the rotational accuracy of the ferrule F due to this kind of indentation is prevented, As a result, the cylindricality of the ferrule F is improved. In view of this, in the cylindrical grinding machine shown in FIG. 1, in the said (1) preparation work, it presses on the outer peripheral surface of the ferrule F, rotating the rotational elastic roll F. As shown in FIG.

By the way, in the cylindrical grinding machine M shown in FIG. 1, the rotary elastic roll at the time of pressing the rotary elastic roll 4 to the outer peripheral surface of the ferrule F as the pressing force setting means 16 of the rotary elastic roll 4 is shown. In view of the indentation elastic strain of (4), a configuration in which the indentation elastic strain is set to be equal to the reference value is employed, but instead, the pressing force setting means 16 having the structure shown in Figs. It is also possible.

The pressing force setting means 16 shown in the said figure employ | adopts the structure which sets the pressing force of the rotational elastic roll 4 to a predetermined value by the pressure spring 19. As shown in FIG. In the cylindrical grinding machine M shown in FIG. 5, FIG. 6 on the setting structure of this pressing force, the guide member main body 21 which has the guide hole 20, and its guide hole 20 on the slide table 11 is shown. A guide means 23 composed of a round guide 22 slidably inserted into the slide guide, and the roll spindle unit 5 as a whole (including the rotary elastic roll 4) integrally with the round guide 22. Has adopted a structure capable of sliding in the pressing direction of the rotary elastic roll (4). Then, the pressure spring 19 is interposed between the guide member main body 21 and the roll spindle unit 5 so that the rotary elastic roll 4 is always in the pressing direction through the pressure spring 19. It has a structure that is urged by a certain pressing force. In addition, the spring force of the pressure spring 19 can be finely adjusted by the spring force adjustment screw 19-1.

By the way, when the pressing force setting means 16 of the structure shown in FIG. 5, FIG. 6 is employ | adopted, even if the outer diameter dimension of the ferrule F changes and shrinks according to the progress of the outer diameter grinding, The pressing force of the rotary elastic roll 4 by this does not change, and the rotation operation | movement of the elastic rotary roll 4 is stable. In addition, the work of adjusting the pressing force of the rotary elastic roll 4 is unnecessary, thereby reducing the burden on the worker.

In addition, in the cylindrical grinding machine M shown in FIG. 1, although the dial gauge 17 is employ | adopted as a measuring means of the movement amount (the slide movement amount of the rotary elastic roll 4) of the slide table 11, other than this Measuring means may be employed. In addition, the slide table 11 may be a NC slide table configured to combine a servomotor and a ball screw to numerically control the position at which the roll 4 presses the ferrule 4.

In addition, in the cylindrical grinding machine M shown in FIG. 5, FIG. 6, although the pressure spring 19 is employ | adopted as a means which presses the rotating elastic roll 4 to the outer peripheral surface of the ferrule F by a fixed pressing force, instead For example, the structure which presses the rotating elastic roll 4 to the outer peripheral surface of the ferrule F with a fixed force by an air cylinder, a hydraulic cylinder, etc. can also be employ | adopted.

In the said embodiment, although the example which outer-surface grinding of the ferrule F as a cylindrical workpiece was demonstrated, this invention is applicable also when outer-cylindrical grinding of cylindrical workpieces other than ferrule F is carried out.

According to the cylindrical grinding machine according to the present invention, as described above, in order to install the pressing force setting means for setting the pressing force at the time of pressing the rotary elastic roll on the outer circumferential surface of the cylindrical workpiece on the grinding machine Even if it is carried out, regardless of the experience and intuition of the operator as in the prior art, the pressing force setting means can optimally set the pressing force of the rotary elastic roll, and the problem that the pressing force deviates from the optimum value, for example, the fixed tail stock center and the operation Breakage of the tail stock center, premature wear, abnormal wear, uneven rotation of the cylindrical workpiece, and the like can be prevented, and the roundness of the cylindrical workpiece can be improved.

In the present invention, when the rotary elastic roll is pressed against the outer circumferential surface of the cylindrical workpiece as the structure of the pressing force setting means, a structure comprising a urging means such as a pressing spring for urging the rotary elastic roll to a predetermined pressing force in the pressing direction thereof is provided. When employ | adopted, even if the outer diameter dimension of a cylindrical workpiece shrinks and changes with the progress of the outer diameter grinding, the pressing force of the rotating elastic roll by a biasing means does not change, and stable rotational operation of an elastic rotating roll can be obtained. Moreover, the work which adjusts the pressing force of a rotating elastic roll becomes unnecessary, and can reduce burden on an operator.

In the present invention, when the structure for pressing the outer circumferential surface of the cylindrical work piece while rotating the rotatable roll is adopted, the pressing position of the rotatable roll is always changed during the setting period of the pressing force of the rotatable roll. The indentation due to the pressing force is hardly applied to the rotational elastic roll side, and the reduction in the rotational accuracy of the cylindrical workpiece due to this kind of indentation can be prevented, and the cylindrical precision of the cylindrical workpiece can be further improved.

In the present invention, when the rotational elastic roll is in contact with the outer circumferential surface of the cylindrical workpiece, when the rotational direction of the rotational elastic roll is adopted, the rotational direction of the cylindrical workpiece is also reversed based on the inversion operation. However, due to the momentum of the inversion operation, it is possible to precisely insert and engage the fixed tail stock center and the movable tail stock center to the inner diameter of the cylindrical workpiece, whereby the clamp support posture of the cylindrical workpiece is stabilized by both centers. Therefore, also in this case, the cylinder precision improvement of a cylindrical workpiece can be aimed at further.

Claims (6)

Both center supporting means for rotatably supporting the cylindrical workpiece by a fixed tail stock center and a movable tail stock center; A rotating elastic roll pressed against the outer circumferential surface of the cylindrical workpiece and imparting a rotational force to the cylindrical workpiece; Sliding means for sliding the rotary elastic roll back and forth with respect to the outer circumferential surface of the cylindrical workpiece, and maintaining the rotary elastic roll at a predetermined slide position; A grinding wheel for grinding the outer circumferential surface of the cylindrical workpiece by adjoining the outer circumferential surface of the cylindrical workpiece from a position opposite the rotating elastic roll via the cylindrical workpiece; and And a pressing force setting means for setting the pressing force at the time of pressing the rotary elastic roll to a predetermined level on an outer circumferential surface of the cylindrical workpiece. The method of claim 1, The pressing force setting means includes measuring means for measuring the slide movement amount of the rotary elastic roll, and on the basis of the measurement result in the measuring means, the pressure when the rotary elastic roll is pressed against the outer circumferential surface of the cylindrical workpiece. A cylindrical grinding machine characterized by setting an indentation elastic deformation of a rotating elastic roll to a certain level. The method of claim 1, The pressing force setting means pressurizes the rotating elastic roll to pressurize the rotating elastic roll with a predetermined pressing force in the pressing direction, or pressurizes with a predetermined pressing force when pressing the rotating elastic roll to an outer circumferential surface of the cylindrical workpiece. Cylindrical grinding machine comprising the other means to. The method of claim 1, And said rotating elastic roll has a structure that is pressed against an outer circumferential surface of said cylindrical workpiece during rotation. The method of claim 1, The cylindrical grinding machine characterized by having a structure which reverses the rotation direction of this rotating elastic roll in the state which the said rotating elastic roll contact | connects the outer peripheral surface of the said cylindrical workpiece. The method of claim 1, The center support means includes a fixed tail stock center engaged with an inner diameter portion of the cylindrical workpiece on one surface side of the cylindrical workpiece and an inner diameter portion of the cylindrical workpiece on the other end surface side of the cylindrical workpiece. A cylindrical grinding machine having a movable tail stock center pressed against a side of a fixed tail stock center, and configured to rotatably support the cylindrical workpiece by the fixed tail stock center and the movable tail stock.