JPH05337800A - Spherical surface polishing device - Google Patents

Abstract

PURPOSE:To eliminate loss time due to work replacement and enhance the producibility by furnishing a rotary table which locates, when one of the work holders is set in the polishing position of a polishing means, at least one of the remaining work holders in the work replacing position. CONSTITUTION:A work holder retaining means C is sunk and a work 6 held by a work holder B is separated from a polishing element 1 so that a rotary table E is ready for rotating as soon as the grinding of the work in place 6 is ended. The rotary table E is rotated, and the work holder B holding the polished work 6 is moved and located in the work replacing position. At the same time, another work holder holding an unground work is moved and located in the polishing position. This arrangement nullifies loss time and allows starting of the polishing and tool replacing operations in parallel.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spherical polishing apparatus for optical lenses and the like.

[0002]

2. Description of the Related Art In recent years, the field of application of optical technology has increased, the demand for optical lenses has expanded, and it is desired to improve the productivity of lens polishing apparatuses. As a first conventional example, a conventional lens polishing method includes a recess method in which a plurality of works are attached to a work holder facing one polishing grindstone for processing.
Further, as a second conventional example, there is a method of polishing one work with one polishing grindstone as described in JP-A-61-1738525 and JP-A-3-19740.

[0003]

However, the recess system of the first conventional example has a problem that automation is difficult because the work is attached to the work holder with an adhesive.
Further, in the method of the second conventional example, since one work holder is provided for one polishing grindstone, the work replacement time after the completion of processing becomes the polishing stop time, and productivity is improved even if the operator is skilled in the operation of the device. There is a problem that the upper limit of improvement can be kept low. In addition, since the work holder deteriorates quickly, it is necessary to periodically replace the work holder in order to perform high-precision machining. In the second conventional example, the work holder is traditionally screwed and fixed. There is a problem that it takes time and the apparatus is stopped during that time to further reduce the productivity.

An object of the present invention is to solve the above problems and to provide a spherical polishing apparatus having high productivity.

[0005]

In order to solve the above-mentioned problems, a spherical polishing apparatus of the present invention holds a polishing grindstone at a shaft end and rotates the shaft axially, and the axial direction of the shaft rotation is the polishing grindstone. Polishing means that swings around the polishing position, a work holder that holds a work at the end facing the polishing grindstone, and a work holder holding means that holds the work holder rotatably and vertically. In a spherical polishing apparatus having a work holder pressing means for pressing the work holder rotatably and vertically movable by the work holder holding means against the polishing grindstone,
When a plurality of the work holders and the work holder holding means are provided, the work holders and the work holder holding means are held and rotated, and when one work holder is positioned at the polishing position of the polishing means, It is characterized in that it comprises a rotary table for positioning at least one of the work holders at the work replacement position.

In order to solve the above problems, the spherical polishing apparatus of the present invention has one work holder pressing means installed below the rotary table and below the polishing position. However, it is preferable that the work holder held by the work holder holding means positioned at the polishing position by the rotation of the rotary table is pressed against the polishing grindstone.

Further, in order to solve the above-mentioned problems, the spherical polishing apparatus of the present invention identifies the work holder holding means among a plurality of work holder holding means at the polishing position. It is preferable to provide means.

Further, in order to solve the above-mentioned problems, the spherical polishing apparatus of the present invention is preferably provided with an ascending position detecting means for detecting a pressing ascending position of the workpiece holder or the workpiece holder holding means at the polishing position. is there.

Further, in the spherical polishing apparatus of the present invention, in order to solve the above problems, the work holder has a bearing fixed to either one of the fitting gaps between the work holder and the work holder holding means. By providing a portion where the work holder and the work holder holding means abut in a ring shape, and in at least one of these abutting portions, the ring abutting portion is a tapered surface that opens in the fitting insertion direction. It is preferable that one-touch attachment / detachment is possible.

[0010]

The spherical polishing apparatus of the present invention comprises a polishing means for holding a polishing grindstone at its shaft end portion for axial rotation and for swinging the axial direction of this axial rotation about the polishing position of the polishing grindstone. A work holder that holds a work at an end facing the grinding wheel, a work holder holding means that holds the work holder rotatably and vertically, and a work holder that is rotatably and vertically moveable by the work holder holding means. In a conventional spherical polishing apparatus having a work holder pressing means for pressing the work holder against the polishing grindstone, a plurality of the work holders and the work holder holding means are provided, and these work holders and work holder holding means are provided. Holding and rotating, when one work holder is positioned at the polishing position of the polishing means, the other work holder Since the rotary table for positioning at least one of the workpieces at the workpiece replacement position is provided, another workpiece positioned at the workpiece replacement position during polishing of the workpiece held by one workpiece holder positioned at the polishing position. Since the polished work of the holder can be replaced with an unpolished work, as soon as the polishing of the work being polished is completed, lower the work holder holding means so that the rotary table can be rotated,
The work held by the work holder is separated from the grinding wheel, the rotary table is rotated, and the work holder holding the ground work is moved to and positioned at the work replacement position, and at the same time, holding the unpolished work. The other work holder can be moved to the polishing position and positioned, and the polishing work and the replacement work can be started immediately.

In the spherical polishing apparatus of the present invention, one work holder pressing means is installed below the rotary table and below the polishing position, and the work holder pressing means polishes by rotating the rotary table. Since the work holder held by the work holder holding means positioned at the position is pressed against the polishing grindstone, the work holder of each work holder holding means positioned at the polishing position is ground by this one holder pressing means. It becomes possible to press against the grindstone, which simplifies the structure of the device and reduces the cost of the device.

Further, since the spherical polishing apparatus of the present invention is provided with the work holder holding means identifying means for identifying which work holder holding means among the plurality of work holder holding means is in the polishing position, a plurality of work holder holding means identifying means are provided. When each work holder holding means has its own habit, polishing processing conditions (polishing time, number of times the polishing means rocks, rocking position of the grinding means with respect to the work, rocking amplitude, etc.) for each work holder holding means
Can be individually held, and based on the identification of the work holder holding means identifying means, polishing can be performed under unique conditions suitable for the work holder holding means.

Further, since the spherical polishing apparatus of the present invention is provided with the ascending position detecting means for detecting the pressing ascending position of the work holder or the work holder holding means at the polishing position, the work holder is moved depending on the detected position. It becomes possible to detect whether the work is held or not. In the case of abnormality, polishing can be stopped and the abnormality can be corrected.

Further, in the spherical polishing apparatus of the present invention, the work holder has the work holder and the work holder holding means through a bearing fixed to one of the fitting gaps between the work holder and the work holder holding means. Since and are provided with a ring-shaped contact portion, and at least one of these contact portions is a tapered surface that opens in the fitting insertion direction, one-touch attachment / detachment is possible, It is possible to eliminate the loss of operating time due to periodical replacement of the work holder.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the spherical polishing apparatus of the present invention will be described with reference to FIGS.

In FIG. 1, the polishing means A is a polishing grindstone 1.
A drive spindle 2 for holding the grinding wheel 1 at the shaft end and forcibly rotating it, a drive motor 3 for the drive spindle 2, and the drive spindle 2
And a swing frame 4 for holding the drive motor 3 and a swing drive means 5 for swinging the swing frame 4.

The work holder B holds the work 6 at the end portion facing the polishing grindstone 1 and is fitted to the upper end portion of the work holder holding shaft 7 (described later) of the work holder holding means C (described later). ..

Two work holder holding means C are held on a rotary table E (described later) (in this embodiment, the number is two, but the number is not limited to two if the number is two), and the work holder holding shaft 7 is the above-mentioned. Work holder B on top of
Is held by the sleeve 8 fixed to the rotary table E so as to be rotatable and vertically movable.

Further, the lower part of the work holder holding shaft 7 has a large outer shape, and a pressing spring 9 is provided on the work holder holding shaft 7 between the enlarged outer part and the sleeve 8. .. Further, a detection dog 11 for detecting a raised position of the work holder holding shaft 7 is provided in a lower portion of the work holder holding shaft 7 having a large outer shape, and a sensor 12 provided in a bearing housing 15 (described later) is provided.
Together with this, the ascending position detecting means D is configured.

The rotary table E holds two work holder holding means C, rotates about the rotary shaft 13 constituting the rotary table E, and holds the work holder B held by one work holder holding means C. Polishing position (polishing whetstone 1
At the same time, the work holder B held by the other work holder holding means C is positioned at the work replacement position 19. The rotating shaft 13 is rotatably held by a main body frame 14 and a bearing housing 15 fixed to the main body frame 14 via a bearing retainer 17 and a bearing 16. Rotating shaft 1
The rotating shaft 13 protruding below the bearing housing 15 that supports the lower end of the bearing 3 through the bearing 16.
A gear 20 is attached to the lower end of the. Further, the bracket 21 is provided below the bearing housing 15.
A rotary actuator 22 for rotating the rotary table E is attached via the rotary table E. The rotary actuator 22 rotates the rotary shaft 13 via a gear 23 and the gear 20.

The rotary table E has a detection dog 24 for identifying the work holder holding means C and constitutes a work holder holding means identifying means F together with a sensor 25 provided on the main body frame 14.

The work holder pressing means G is provided below the bearing housing 15 via a bracket 31. A pressing cylinder 28 that constitutes the work holder pressing means G is attached to the bracket 31. An insertion pin 32 is attached to the pressing cylinder 28. The tip of the insertion pin 32 is inserted into the pressing pin 26, and two sliding rings 29 are attached to the insertion pin 32, and there are pressing springs 30 between these sliding rings 29 and 30 pressing force,
Through the sliding ring 29, the fixing ring 33 is added to the push pin 26 so as to push it up.
Regulates the span of the sliding ring 29 and the pressing spring 30. The tip of the pressing pin 26 passes through a bush 27 provided on the lower side of the bearing housing 15,
The work holder holding means C positioned at the polishing position 18 is arranged so as to be able to contact the lower end of the work holder holding shaft 7. During the polishing operation, the pressing cylinder 28 operates to push up the insertion pin 32, and the pressing force of the pressing spring 30 causes the pressing pin 26 (the pressing pin 26 is in contact with the lower end of the work holder holding shaft 7). The work holder holding shaft 7 is pushed up via and the work at the upper end thereof is pressed against the polishing grindstone 1.

FIG. 2 is a plan view showing the polishing position 18 and the work replacement position 19 of the rotary table E of this embodiment.

In FIG. 2, the rotary table E positions one of the work holders B at the polishing position 18 and the other at the work replacement position 19 by rotation. As a result, the workpiece 6 at the polishing position 18 is polished and the workpiece 6 at the workpiece replacement position 19 is replaced. A polishing means A (not shown) is attached to the swing frame 4, and the swing frame 4 swings by swing shafts 38 and 38 '. The swing shaft 38 swings by the swing drive means 5 provided on the body frame 14. The swing drive means 5 includes a swing motor 34, a drive pulley 35,
The timing belt 36 and the timing pulley 37 are provided to swing the swing shaft 38.

FIG. 3 is a sectional view of the work holder B of this embodiment.

In FIG. 3, the end of the work holder B facing the polishing grindstone 1 holds the work 6 via an elastic body 39. Work holder B inserted into the upper end of the work holder holding shaft 7 of the work holder holding means C
In the fitting gap between the work holder B and the work holder holding shaft 7, the pivot 44 at the tip of the work holder holding shaft 7 contacts the taper portion of the tapered bearing 40 attached to the work holder B, and the work holder B
The intermediate portion of the bearing 4 is fixed near the tip of the work holder holding shaft 7 by a nut 42 and a bearing stopper 43.
It is in contact with 1. For example, as in the present embodiment, in the fitting gap between the work holder B and the work holder holding shaft 7 of the work holder holding means C, the work holder and the work holder holding via the bearing fixed to one of them. A means is provided with a ring-shaped contact portion,
At least one of these abutting portions has a ring-shaped abutting portion that is a tapered surface that opens in the fitting insertion direction, so that one-touch attachment / detachment is possible. Since the work holder B and the work holder holding shaft 7 are brought into contact with each other via the bearings as described above, the work holder B is rotatable and the polishing grindstone 1 swings during the polishing operation. Since the rotation of the polishing wheel 1 and the rotation axis of the work 6 (workpiece holder B) constantly change due to the swing, the rotation direction of the portion pressed by the work always changes. The work holder B rotates while constantly changing the number of rotations, and the sliding between the polishing grindstone 1 and the work 6 always occurs, so that the work 6 is polished.

When the polishing work is completed, the polishing liquid pipe 45
The supply of polishing liquid from is stopped. The pressing cylinder 28 descends, and the pressing pin 26 separates from the lower end of the work holder holding shaft 7 of the work holder holding means C. When the pressurized air 46 from the polishing means A side is sent between the polishing grindstone 1 and the work 6, the work 6 is separated from the polishing grindstone 1 and the pressing spring 9 is pressed.
By this action, the work holder holding shaft 7 descends, and the work holder B descends.

When the work holder B is lowered, the rotary table E is rotated and the positions of the work holder holding means C are changed.

Next, the operation of this embodiment will be described collectively.

In this embodiment, two work holders B and two work holder holding means C are provided, and these work holders B and work holder holding means C are held and rotated to polish one work holder B. Polishing position 1 of means A
Since the rotary table E is provided so as to position the other work holder B at the work replacement position 19 when positioned at 8, the work 6 held by one work holder B positioned at the polishing position 18 is held. During polishing, the polished work 6 of the other work holder B positioned at the work replacement position 19 can be replaced with the unpolished work 6, so that the work holder is held as soon as the polishing of the work being polished is completed. The means C is lowered downward so that the work 6 held by the work holder B is polished by the grinding wheel 1
Away from, rotate the rotary table E, the polished work 6
The work holder B holding the
At the same time that the workpiece holder 9 is moved to and positioned at position 9, the other workpiece holder B holding the unpolished workpiece 6 is moved to and positioned at the polishing position 18, and the polishing operation and the replacement operation can be started immediately.

Further, in this embodiment, the polishing means A is on the upper side, the rotary table E is below the polishing means A, and one work holder pressing means G is installed below the rotary table E and below the polishing position 18. Since the work holder pressing means G presses the work holder B held by the work holder holding means C positioned at the polishing position 18 by the rotation of the rotary table E against the polishing grindstone 1, this one holder pressing operation is performed. Work holder B of each work holder holding means C positioned at the polishing position 18 by means G
Can be pressed against the polishing grindstone 1, the structure of the device is simplified, and the cost of the device is reduced.

Further, in this embodiment, the work holder holding means identifying means F for identifying which work holder holding means C among the plurality of work holder holding means C is in the polishing position 18 is provided. When the work holder holding means C has different habits, the polishing processing conditions (polishing time, the number of times the polishing means is rocked, the rocking position and the rocking amplitude of the polishing means with respect to the work) are different for each work holder holding means C. etc)
Can be individually held, and based on the identification of the work holder holding means identification means F, polishing can be performed under unique conditions suitable for the work holder holding means C.

Further, in this embodiment, since the raising position detecting means D for detecting the pushing and raising position of the work holder B and the work holder holding means C at the polishing position 18 is provided, the work holder is determined depending on the detected position. It becomes possible to detect whether B holds the work 6 or not. In the case of abnormality, polishing can be stopped and the abnormality can be corrected.

Further, in this embodiment, the work holder B is held in the fitting gap between the work holder B and the work holder holding means C via the bearing fixed to one of the work holder B and the work holder holding means C. A ring-shaped contact portion with the means C is provided, and at least one of these contact portions has a tapered surface that opens in the fitting insertion direction, so that one-touch attachment / detachment is possible. Therefore, it is possible to eliminate the loss of operating time due to the periodical replacement of the work holder B.

The spherical polishing apparatus of the present invention is not limited to the above embodiment, but various modes are possible. For example, as long as it is suitable for the purpose of positioning one of the plurality of work holders in the polishing position and the other one in the work replacement position, the design of the rotary table and the selection of the driving source (instead of the rotary actuator of the embodiment, You can use a pulse motor).

The work holder pressing means can be freely designed as long as the pressing force against the polishing means can be applied to the work holder in the polishing position.

The swing drive means can be designed freely according to the structure of the spherical polishing apparatus (a link mechanism may be used instead of the belt of the embodiment).

The ascending position detecting means and the work holder holding means identifying means can be freely designed in terms of the structure and position of the detection dogs and sensors according to the structure of the spherical polishing apparatus.

[0039]

EFFECTS OF THE INVENTION The spherical polishing apparatus of the present invention is provided with a rotary table, so that it is possible to eliminate loss time due to work replacement work, which has been inevitable in the past, and to improve productivity.

Further, in the spherical polishing apparatus of the present invention, by disposing the rotary table between the polishing means and the work holder pressing means, one holder pressing means holds each work holder held at the polishing position. The work holder of the means can be pressed against the grinding wheel, and even if a rotary table is provided, the structure of the device is relatively simple, and the cost of the device is low.

Further, since the spherical polishing apparatus of the present invention is provided with the work holder holding means identification means, based on the identification of the work holder holding means identification means, the polishing is carried out under the unique condition suitable for the work holder holding means. There is an effect that can be done.

Further, since the spherical polishing apparatus of the present invention is provided with the ascending position detecting means, it is possible to detect whether the work holder holds the work or not, depending on the detected position. This makes it possible, and in the case of an abnormality, polishing can be stopped and the abnormality can be corrected.

Further, in the spherical polishing apparatus of the present invention, since the work holder B can be attached and detached with one touch, it is possible to eliminate the loss of operating time due to the periodical replacement of the work holder B. Play.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of a spherical polishing apparatus of the present invention.

FIG. 2 is a plan view showing the position of the rotary table of FIG.

FIG. 3 is a cross-sectional view showing the relationship among the polishing means, the work holder, the work holder holding means, and the work holder pressing means of FIG.

[Explanation of symbols]

 A polishing means 1 polishing grindstone 2 drive spindle 3 drive motor 4 swing frame 5 swing drive means B work holder 6 work C work holder holding means 7 work holder holding shaft 8 sleeve 9 pressing spring 10 arrow D ascending position detection means 11 detection Dog 12 Sensor E Rotary table 13 Rotating shaft 14 Body frame 15 Bearing housing 16 Bearing 17 Bearing retainer 18 Polishing position 19 Work replacement position 20 Gear 21 Bracket 22 Rotary actuator 23 Gear F Work holder holding means Detection means 24 Detection dog 25 Sensor G Work Holder pressing means 26 Pressing pin 27 Bushing 28 Pressing cylinder 29 Sliding ring 30 Pressing spring 31 Bracket 32 Inserting pin 33 Fixing ring 34 Swing motor 35 Drive Pulley 36 Timing Belt 37 Timing Pulley 38 Swing Shaft 38 'Swing Shaft 39 Elastic Body 40 Tapered Bearing 41 Bearing 42 Nut 43 Bearing Stop 44 Pivot 45 Polishing Liquid Pipe 46 Pressurized Air

Claims (5)

[Claims] 1. A polishing means for holding a polishing grindstone at a shaft end and rotating the shaft and swinging the axial direction of this shaft rotation around a polishing position of the polishing grindstone, and an end facing the polishing grindstone. A work holder for holding a work in a portion, a work holder holding means for holding the work holder rotatably and vertically movable, and a work holder rotatably and vertically movable held by the work holder holding means. In a spherical polishing apparatus having a work holder pressing means for pressing against a polishing grindstone, a plurality of the work holders and the work holder holding means are provided, and these work holders and work holder holding means are held and rotated to form one work holder. When the work holder is positioned at the polishing position of the polishing means, at least one of the other work holders is removed. A spherical polishing apparatus comprising a rotary table for positioning at a replacement position. 2. The spherical polishing apparatus according to claim 1, wherein one work holder pressing means is installed below the rotary table and below a polishing position, and the work holder pressing means is mounted on the rotary table. A spherical polishing apparatus characterized in that a work holder held by a work holder holding means positioned at a polishing position by rotation is pressed against a polishing grindstone. 3. The spherical polishing apparatus according to claim 1, further comprising work holder holding means identifying means for identifying which work holder holding means among the plurality of work holder holding means is in the polishing position. Spherical polishing device. 4. The spherical polishing apparatus according to claim 1, 2 or 3, wherein a rising position detecting means for detecting a pressing rising position of the work holder or the work holder holding means in the polishing position is provided. 5. The spherical polishing apparatus according to claim 1, 2, 3 or 4, wherein the work holder has a bearing fixed to either one of the fitting gaps between the work holder and the work holder holding means. By providing a portion where the work holder and the work holder holding means abut in a ring shape, and in at least one of these abutting portions, the ring abutting portion is a tapered surface that opens in the fitting insertion direction. A spherical polishing device that can be attached and removed with one touch.