JPH1177533A - Grinding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform shape generation for a work piece to be ground, and simultaneously complete its grinding surface in mirror finish. SOLUTION: Optical glass raw material 1 is supported by a W axis main body part 2 in such a way that it can be rotated by a W axis motor 3. Besides, a conductive grinding wheel 21 is held by a W axis main body part 22 in such a way that it can be rotated by a W axis motor 23, and the optical glass raw material 1 is made freely rotatable around the spherical center 0 of a spherical surface 13. An electrode 31 for an electrophoresis phenomenon is provided in the vicinity of the grinding wheel 21, negatively charged polishing liquid including polishing particulates is fed out of a grinding liquid feeding device 39 through a nozzle 37 to a space between the electrode 31 and the grinding wheel 21. The voltage of a power supply 35 is applied to make the electrode 31 negative, and to make the grinding wheel 21 positive, so that the negatively charged polishing particulates are thereby adhered to the grinding wheel 21 by making use of an electrophoresis phenomenon.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an apparatus for grinding an optical glass material.

[0002]

2. Description of the Related Art An apparatus for grinding an optical glass material has been disclosed in Japanese Patent Publication No. 8-5011.
The device is shown in FIG.

[0003] This apparatus is an apparatus for dressing a grindstone by electrolysis at least at the time of spark-out to grind an optical glass element.
Numeral 0 is rotatably held by a work shaft main body 91 via a work holder 92. On the other hand, a grindstone 93 made of a conductive bond is rotatably held by a grindstone shaft 94 so as to face the processing surface 90 a of the optical glass material 90. An electrode 95 for electrolytic dressing is arranged on the outer periphery of the work holder 92 so as to face the grinding surface 93 a of the grinding stone 93. In addition, a power supply 96 for applying a voltage using the electrode 95 for electrolytic dressing as a cathode and the grindstone 93 as an anode is provided, and a supply device 97 for supplying a weakly conductive coolant between the electrode 95 for electrolytic dressing and the grindstone 93 is provided. Have been.

According to the above apparatus, at least at the time of spark-out, the grinding surface 93a of the grindstone 93 during the grinding of the optical glass material 90 is electrolytically dressed, so that the grinding surface 9 is formed.
3a, and the distance between the ground surface 93a and the processed surface 90a of the optical glass material 90 is made constant.

[0005]

However, the conventional grinding apparatus has a configuration suitable for an electrolytic dressing method, and uses an electrophoresis phenomenon proposed by the present invention to attach an abrasive to perform processing. It is not suitable for the grinding method to be performed.

That is, the conventional grinding apparatus has a function for performing electrolytic dressing at the time of spark-out, in addition to a known spherical surface generating apparatus. That is, after the grindstone 93 makes a cut in the optical glass material 90, while maintaining its position, that is, in a spark-out state in which no cut is given, the grinding surface 93a of the grindstone 93 is electrolyzed, and the grinding surface 93a It is configured to perform dressing, which is a feature of the present invention. Therefore, it is necessary to separately polish the processed surface 90a of the cut optical glass material 90.

Therefore, in the conventional grinding apparatus, in order to use the electrophoresis phenomenon to intensively apply the electrolysis to the portion to be cut, which is the grinding surface 93a of the grindstone 93, to attach the abrasive, it is necessary to use an electrolytic dressing. As described above, it is necessary to electrically attach abrasive grains, which are abrasives, to the grindstone 93 instead of eluting the grindstone 93 by electrolysis and sharpening the abrasive grains. However, in a portion where the grindstone 93 makes a cut, a grinding force (a force generated when the grindstone 93 cuts the optical glass material 90) due to the cut is much larger than an electric adhesive force (adhesive force). There is a problem that sufficient adhesion of the particles cannot be obtained.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and has as its object to provide a grinding apparatus capable of creating a shape on an object to be ground and mirroring a ground surface at the same time.

[0009]

According to a first aspect of the present invention, there is provided a grinding apparatus for grinding an optical glass material with a grindstone, comprising: Holding means, an electrode for electrophoresis phenomenon provided in the vicinity of the grinding wheel, and the electrode as a cathode,
A power supply for applying a voltage with the grindstone as an anode, a polishing liquid supply means for supplying a polishing liquid containing negatively charged polishing particles between the electrode and the grindstone, and a means for holding the optical glass material And means for simultaneously moving the whetstone, the optical glass material, or the whetstone and the optical glass material along a shape of a surface to be created on the optical glass material.

[0010] The grinding apparatus according to the second invention is characterized in that the grinding apparatus comprises:
In the grinding device according to the present invention, the means for holding the grindstone includes means for holding the grindstone so that it can advance and retreat and rotate freely, and the means for holding the optical glass material,
The optical glass material is provided with a means for holding the optical glass material so as to be able to move forward and backward and rotate freely.

Further, the grinding device according to a third aspect of the present invention is the grinding device according to the first aspect of the invention, wherein the whetstone uses the electrophoresis phenomenon to cut the surface into which the optical glass material is cut and the polishing fine particles. And a surface for making the surface of the optical glass material cut by the cut surface into a mirror surface by the attached polishing fine particles.

[0012] A grinding device according to a fourth invention is the grinding device according to the first invention, wherein the fine particles for polishing are silica or cerium oxide.

That is, the grinding device according to the first invention is:
By using a grindstone having conductivity as an anode, an electrode for electrophoresis phenomenon as a cathode, and supplying a polishing liquid containing negatively charged polishing fine particles between the grindstone and the electrode from a polishing liquid supply means, the polishing fine particles are removed. While attaching to the grindstone using the electrophoresis phenomenon, along with the shape of the surface to be created in the optical glass material, by simultaneously moving the grindstone or the optical glass material or the grindstone and the optical glass material,
While creating the surface shape on the optical glass material, the created surface is polished at the same time.

Further, the grinding apparatus according to the second aspect of the present invention is provided with a means for holding the grindstone so as to be able to advance and retreat and rotatably, and a means for holding the optical glass material so as to be able to advance and retreat and rotate freely. The radius of curvature of the surface shape to be formed is arbitrarily changed, and the thickness obtained by grinding is arbitrarily changed.

Further, the grinding apparatus according to a third aspect of the present invention is provided with a surface on which the grindstone cuts the optical glass material, and a surface on which polishing fine particles are adhered by using an electrophoresis phenomenon, and the grinding wheel cuts on the cut surface. The surface of the optical glass material is mirror-finished with the surface to which the polishing fine particles are attached.

In the grinding apparatus according to a fourth aspect of the present invention, the fine particles for polishing are made of silica or cerium oxide, and the fine particles for polishing are adhered to a grindstone to grind the optical glass material.

First, before describing a specific embodiment of the present invention, the basic configuration and operation of a grinding apparatus according to the present invention will be described with reference to FIG.

An optical glass material 1 as an object to be ground is rotatably held by a W-axis main body 2 on a base (not shown) of the present grinding apparatus. It is designed to be rotated around 4. The W axis 4 is set so as to pass through the spherical center O of the spherical surface 13 created in the optical glass material 1, and the optical glass material 1 can move forward and backward along the W axis 4 by means not shown. . This forward / backward movement becomes the cut amount setting axis X. By controlling this movement amount, the position of the spherical shape created on the optical glass material 1 is determined, and the final thickness of the optical glass element obtained by creation is determined. Can be. The W-axis main body 2 is fixed on a base of the apparatus or provided movably in the W-axis 4 direction. Further, the W-axis main body 2 may be provided in a means for moving the optical glass material 1 around the spherical center O of the spherical surface 13 in order to move the optical glass material 1 along the shape of the spherical surface 13 to be created on the optical glass material 1. Good.

On the base of the apparatus, a grinding wheel 21 which is a conductive grinding wheel is rotatably held by a T-axis main body 22. A T-axis motor 23 controls a T-axis 24 which is a grinding wheel axis.
It is designed to be rotated around. The T-axis 24 is set so as to pass through the spherical center O, and the grinding wheel 21 can move back and forth along the T-axis 24 by means not shown. This forward / backward movement becomes the radius of curvature setting axis SR, and the spherical surface 13 created by controlling this movement amount
Can be set. T axis main body 22
An arc operation motor as a means for moving (turning) the grinding wheel 21 along the shape of the spherical surface 13 to be created on the optical glass material 1 around the spherical center O on the base of the apparatus. Is provided. The grinding wheel 21 includes the grinding wheel 2
A grindstone side surface 25 for making a circular arc cut from the outer peripheral surface 14 of the optical glass material 1 into a desired shape of the spherical surface 13 of the optical glass material 1 by rotating the optical glass material 1 around the spherical center O in the direction of the arrow θ; Spherical surface 13 obtained by cutting
There is provided a grindstone front 26 for polishing simultaneously with the creation.

An electrode 31 for electrophoresis is provided at a position in the vicinity of the grinding wheel 21 which is in the vicinity of the grinding wheel 21. The electrode 31 for electrophoresis is connected to the (−) side of a power supply 35 such as a DC or pulse wave as a power supply for applying a voltage using the electrode 31 as a cathode and the grinding wheel 21 as an anode. A brush 36 that is in contact with the grinding wheel 21 is connected to the (+) side of the power supply 35.

A nozzle 37 as a polishing liquid supply means for supplying a polishing liquid containing fine particles for polishing and a supply device 3
9 is provided, and the nozzle 37 is disposed at a position where the polishing liquid can be supplied between the electrode 31 for electrophoresis and the front face 26 of the grindstone. The polishing liquid is composed of a polishing material 40 such as colloidal silica or colloidal cerium oxide containing negatively charged fine particles.

Further, the W-axis motor 3 and the T-axis motor 2
3. Means for moving optical glass material 1 forward and backward, grinding wheel 2
1 for moving the rotating wheel 1 forward and backward, a motor for moving an arc as a means for moving (turning) the grinding wheel 21 along the shape of the spherical surface 13 to be created, and each operation of the supply device 39, that is, a W-axis motor. 3 / T-axis motor 23 ON /
OFF and rotation speed control, position control of the cutting amount setting axis X and the curvature radius setting axis SR by the advancing and retreating means of the optical glass material 1 and the grinding wheel 21, ON / OFF and speed of the circular cutting of the spherical surface 13 to be created. Control and supply device 3
9 is provided with a control device 41 for controlling the supply amount of the grinding fluid and ON / OFF of the supply.

Next, the operation of the grinding apparatus having the above configuration will be described. The present grinding device is designed to control the grinding wheel front surface 26 of the grinding wheel 21.
While the abrasive 40 is electrically adsorbed on the surface of the optical glass material 1, the grinding wheel 21 is caused to make a circular arc movement along the radius of curvature R of the spherical surface 13 to be created, and at the same time, the spherical surface 13 is cut. While polishing the surface 13
It is to create.

An electrophoresis phenomenon electrode 31 to which a negative charge is applied by a power source 35 such as a direct current or a pulse wave;
Polishing of colloidal silica or colloidal cerium oxide containing negatively charged fine particles from both the grinding fluid supply device 39 and the nozzle 37 to both of the grinding wheels 21 given a positive charge via the brush 36. When the abrasive 40 is applied, the negatively charged fine abrasive 4 is applied to the positive grinding wheel 21 by the electrophoresis phenomenon.
0 is attracted and the abrasive 40
Adheres. In this state, the tip of the grinding wheel 21 rotated by the T-axis motor 23 around the T-axis 24, which is the grinding wheel axis, draws the curvature radius R of the spherical surface 13 to be created by the operation control of the control device 41. The spherical surface 13 to be created
When a circular arc cut in the direction of the arrow θ, which is circular motion, is performed by the circular motion motor around the spherical center O, the grindstone side surface 25 is rotated from the outer peripheral surface 14 of the optical glass material 1 by the W-axis motor 3. Start grinding, grindstone front 25
Abrasive 40 adhering to the sphere 13
Is polished on the surface having the curvature radius R. That is, the whetstone side 2
In No. 5, since the grinding for forming the shape is performed, a very high grinding force is applied, so that the abrasive 40 electrically adhered is removed.
In this case, since the polishing proceeds along the surface of the spherical surface 13 formed by shaving, the grinding force is relatively small, and the abrasive 40 is less likely to be peeled off. Therefore, even when the spherical surface 13 is created, the abrasive 40 is held on the front face 26 of the grindstone, and contributes to the polishing of the surface of the spherical surface 13. Therefore,
The created spherical surface 13 is polished by the abrasive 40 attached to the grindstone front surface 26, and the mirror surface of the spherical surface 13 progresses at the same time, and the grindstone front surface 26 is used as a work axis by a circular motion motor. By moving the optical glass material 1 to reach the W axis 4, a spherical surface 13 having a radius of curvature R and a mirror surface is created in the optical glass material 1 as an object to be ground.

That is, since the grinding for forming the shape and the polishing for finishing the ground surface proceed simultaneously, it is necessary to obtain a higher surface roughness than that which can be formed by the grinding wheel 21 used for forming the shape. In addition to the above, the grinding process by the grinding of the grinding wheel 21 and the polishing process by the attached abrasive 40 proceed simultaneously, so that the processing time for grinding and polishing can be shortened.

In FIG. 1, the shape of the grindstone front surface 26 is shown as a conical shape. However, the inclined surface of the grindstone front surface 26 does not necessarily need to be inclined from the portion in contact with the grindstone side surface 25. The same operation and effect can be obtained as long as the shape has a portion protruding inside.

Further, the grinding wheel 21 is rotated in a direction of an arrow θ in the direction of an arrow θ with respect to the optical glass material 1 rotating at a fixed position, that is, around the spherical center O, and the optical glass material 1 is cut by the grinding wheel 21. However, conversely, while rotating the grinding wheel 21 at a fixed position, the optical glass material 1 is caused to circularly move around the spherical center O,
The desired spherical surface 13 can be created in the optical glass material 1 even when the optical glass material 1 is rotated in the direction opposite to the arrow θ. Furthermore, the spherical surface 13 can be created in the optical glass material 1 by rotating the optical glass material 1 in the direction opposite to the arrow θ direction at the same time as the cutting in the arrow θ direction by the grinding wheel 21.

Further, the W axis 4 and the T axis 24 are crossed,
A case has been described in which the grinding wheel 21 cuts the optical glass material 1 in an arc shape in the direction of the arrow θ to create a mirror-finished spherical surface 13, but the W axis 4 and the T axis 24 are arranged in parallel, If a linear cut is made in the optical glass material 1 in a direction perpendicular to the W axis 4 instead of making the grinding wheel 21 move in an arc, a planar shape mirror-finished in the optical glass material 1 can be created. In this case, the grinding wheel 21 may be rotated at a fixed position, and only the optical glass material 1 may be moved linearly in a direction orthogonal to the T axis.
And the optical glass material 1 may be simultaneously moved linearly in opposite directions.

[0029]

BEST MODE FOR CARRYING OUT THE INVENTION

First Embodiment A first embodiment of the present invention will be described with reference to FIGS. 2 and 3 show a grinding apparatus according to the present embodiment. FIG. 2 is a front view, and FIG. 3 is a side view partially omitted, and a part of the grinding apparatus is shown in section for convenience of explanation.

The present embodiment is applied to the grinding of a spherical lens, and is configured to simultaneously make a ground surface mirror while creating a spherical surface on an object to be ground by uniaxial arc movement.

2 and 3, a work (W) shaft main body 2 having a chuck 6 for detachably holding an optical glass material 1 as an object to be ground is mounted on a base 5 made of a casting or the like of the apparatus. Is provided. The W-axis main body 2 is provided with a W-axis motor 3 for rotating the optical glass material 1 held on the chuck 6 around the W-axis 4 and moving the W-axis motor 4 along the W-axis 4. Is provided. Hereinafter, the W-axis main body 2 including the optical glass material 1, W
The shaft motor 3, the moving means and the like are called a W unit 7, and the W unit 7 constitutes a means for holding the optical glass material 1 so as to be able to advance and retreat and rotate freely. The moving amount by the moving means is the cut amount setting axis X.

A turntable 9 is mounted on the base 5 via a roller 8 composed of a sphere or the like for reducing operating resistance.
It is provided to be rotatable around zero. The shaft 10 has a spherical surface 13 formed on the optical glass material 1 held by the chuck 6.
And is set to be orthogonal to the W axis 4. On the shaft 10, an arc operation motor 11 for rotating the turntable 9 around the axis 10 is fixedly arranged on the lower surface of the base 5, and the arc operation motor 11 and the turntable 5 are connected to a key 12. And is fixedly connected thereto.

A grindstone (T) on which a grinding grindstone 21 as a conductive grindstone can be removably mounted on the turntable 9.
A shaft body 22 is provided. In the T-axis main body 22,
A T-axis motor 23 for rotating the grinding wheel 21 around the T-axis 24 is provided, and moves forward and backward along the T-axis 24 (hereinafter, moving toward the ball O and moving away from the ball O are referred to as evacuation). A moving means not shown is provided. This moving means includes the curvature radius setting axis S
It becomes R. The T axis 24 is disposed so as to intersect with the W axis 4 at the position of the spherical center O, and is set so that the angle of intersection with the W axis 4 is about 90 degrees or less. Hereinafter, the T-axis main body 22 including the grinding wheel 21, the T-axis motor 23, the moving means, and the like are referred to as a T unit 27.
Is constituted so as to be able to move forward and backward and rotate freely. Further, a means for moving the grinding wheel 21 along the shape of the surface to be created on the optical glass material 1 by the arc operation motor 11 and the rotary table 9 is constituted.

The grinding wheel 21 is formed in a cup shape by bonding diamond abrasive grains with a conductive bond. The grinding wheel 21 performs a circular arc cut in the direction of the arrow θ from the outer peripheral surface 14 of the optical glass material 1 on a grindstone side surface 25 and performs a polishing process on the spherical surface 13 of the optical glass material 1 created by the cut on the grindstone front surface 26. Things
On the grindstone front surface 26, an electrophoresis phenomenon electrode 31 for attaching an abrasive to at least the grindstone front surface 26 by electrophoresis,
The support member 33 attached to the attachment member 32 provided on the T-axis main body 22 is opposed to each other with a predetermined gap. The electrode 31 for the electrophoresis phenomenon is located at the front of the grinding wheel 2.
6 when polishing the spherical surface 13 of the optical glass material 1
It is arranged at a position that does not interfere with the optical glass material 1.

The electrode 31 for electrophoresis phenomenon is
The (-) side of a power supply 35 for generating a direct current or a pulse wave for applying a voltage to make 1 a cathode is connected. On the (+) side of the power source 35, a brush 36 that is in contact with the grinding wheel 21 so as to use the grinding wheel 21 as an anode is connected.

A nozzle 37 is disposed via a mounting member 32 toward a gap between the electrode 31 for electrophoresis and the front face 26 of the grinding wheel 21. The nozzle 37 is connected to a supply device 39 having a pump, a constant temperature device, and the like,
The polishing material 40 containing negatively charged abrasive particles such as colloidal silica or colloidal cerium oxide and attached to at least the grindstone front surface 26 is applied to the electrophoretic phenomenon electrode 31.
Can be supplied to the gap between the wheel and the front face 26 of the grindstone.

The W-axis motor 3 of the W unit 7 and moving means (not shown), the T-axis motor 23 of the T unit 27 and moving means (not shown), the circular operation motor 11 of the turntable 9, the power supply 35 and A control device 41 that controls each of them is connected to the supply device 39. This control device 4
Reference numeral 1 denotes an arc operation motor 11 for performing an arc motion of the grinding wheel 21, a position of a radius of curvature setting axis SR for determining a dimension of a radius of curvature R of the spherical surface 13 to be created, and a thickness of the optical glass element after the grinding. Not only the position of the cut amount setting axis X to be determined, but also the voltage of the power supply 35 for applying charges to the grinding wheel 21 and the electrode 31 for electrophoresis and ON / OFF control, the W-axis motor 3 for rotating the optical glass material 1, It controls the number of revolutions and ON / OFF of the T-axis motor 23 for rotating the grinding wheel 21, controls ON / OFF of the supply device 39, and controls the flow rate of the grinding fluid.

Next, the operation of the grinding apparatus having the above configuration will be described. First, the optical glass material 1 is held by the chuck 6 of the W unit 7, the optical glass material 1 is rotated around the W axis 4 by the W axis motor 3, and the grinding attached to the T axis main body 22 of the T unit 27. The grindstone 21 is rotated around a T axis 24 by a T axis motor 23.

At this time, the power supply 35 gives a minus charge to the electrophoretic phenomenon electrode 31 and a plus charge to the grinding wheel 21 via the brush 36, and contains fine particles which are minus charged from the supply device 39. An abrasive 40 of colloidal silica or colloidal cerium oxide
Grinding wheel front surface 26 of grinding wheel 21 and electrode 31 for electrophoresis phenomenon
Supply between. At this time, the negatively charged particulate abrasive 40 adheres around the positively charged grinding wheel 21 due to the electrophoresis phenomenon.

In this state, the rotary table 9 is moved around the axis 10 which passes through the center O of the spherical surface 13 to be created where the W axis 4 and the T axis 24 intersect and which are orthogonal to the both axes 4 and 24 for the arc operation. Motor 1
The optical glass material 1 held by the chuck 6 is started to be cut by the tip of the grinding wheel 21 of the T unit 27 provided on the turntable 9. With this arc cut, the grinding process starts from the outer peripheral surface 14 of the optical glass material 1 on which the grinding wheel side surface 25 rotates, and the radius of curvature R of the spherical surface 13 where the abrasive 40 attached to the grinding wheel front surface 26 is created. Polish.

That is, since grinding for creating a shape is performed on the grinding wheel side surface 25, a very high grinding force is applied, so that the abrasive 40 electrically adhered is removed. On the front face 26 of the grindstone, the surface proceeds along the surface of the spherical surface 13 formed by shaving, so that the grinding force is relatively small and the abrasive 40 is less likely to be peeled off. Therefore, even when the spherical surface 13 is created, the abrasive 40 is held on the front face 26 of the grindstone, and contributes to the polishing of the surface of the spherical surface 13. Therefore, the created spherical surface 1
3, the grinding process is performed by the abrasive 40 attached to the grindstone front surface 26, the mirror surface of the spherical surface 13 progresses at the same time, and the grindstone front surface 26 reaches the W axis 4 by the arc operation motor 11. By moving, a spherical surface 13 having a radius of curvature R and a mirror surface is created in the optical glass material 1 which is the object to be ground.

In this grinding, the radius of curvature R of the spherical surface 13 to be created is set by a signal from the control device 41.
This can be performed by adjusting the position of the curvature radius setting axis SR. That is, when the grinding wheel 21 is moved closer to the spherical center O along the T axis 24 by the advancing / retreating means, the radius of curvature R is reduced, and a small spherical surface 13 can be created. Similarly, when the glass optical material 1 is moved along the W axis 4 by the advancing / retreating means to set the cut amount setting axis X, the thickness of the optical glass element after the grinding can be set.

In the present embodiment, the grinding wheel 21 is moved by the arrow θ to the optical glass material 1 rotating at a fixed position.
Has been described in which the optical glass material 1 is cut by the grinding wheel 21 by rotating in the direction of the circular arc, that is, the spherical center O, in the direction described above. On the contrary, while the grinding wheel 21 is rotated at a fixed position. Even if the optical glass material 1 is moved in an arc around the spherical center O and rotated in the direction opposite to the arrow θ, a desired spherical surface 13 is created in the optical glass material 1 by the same operation as in the present embodiment. can do.

According to the present embodiment, the creation of a spherical shape and the mirroring of the created spherical surface can be simultaneously performed only by simple uniaxial arc movement. Further, the radius of curvature of the spherical surface to be created and the thickness of the optical glass element after the creation can be arbitrarily set.

Second Embodiment A second embodiment of the present invention will be described with reference to FIGS. 4 and 5 show a grinding apparatus according to the present embodiment. FIG. 4 is a front view, and FIG. 5 is a side view with a part omitted.

In this embodiment, the grinding surface is mirror-finished while creating a spherical surface on the workpiece by uniaxial circular motion, and the driving mechanism for the circular motion is located at a position different from the rotation center of the circular motion. Is provided. In the following description, the same members as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

4 and 5, the W-axis main body 2 of the W unit 7 is provided on the base 5 via an L-shaped member 45 so as to advance and retreat along the W-axis 4. T unit 27
The T-axis main body portion 22 is provided on the turntable 46 so as to be able to advance and retreat along the T-axis 24. The turning table 46 is formed in a fan shape, and sets the fan-shaped central portion of the turning table 46 on a bearing 47 such as a bearing provided on the base 5 around the shaft 10 which is the rotation center of the arc cut. The fan-shaped central portion is rotatably provided on the base 5 so as to be located between the base 5 and the L-shaped member 45.

An arc portion 48 which is the outer peripheral surface of the turntable 46
Is protruded outside the base 5, and its arc portion 48 is provided with teeth (not shown) that mesh with a gear 50 fixed to a shaft of an arc operation motor 49 attached to the side surface of the base 5. Further, between the base 5 and the turntable 46, and between the turntable 46 and the L-shaped member 45, there are provided a roller 8 and a roller 51 such as a sphere for reducing the rotational movement resistance of the rotary table 46. Is provided.

Next, the operation of the grinding apparatus having the above configuration will be described. The operation up to the start of the circular motion for performing the circular cut into the optical glass material 1 by the grinding wheel 21 is the same as that of the first embodiment. Grinding wheel 21 with axis 10
When the optical glass material 1 is rotated in the direction of the arrow θ about the
Is driven by the control device 41 to rotate the gear 50 and rotate the turntable 46 in the direction of the arrow θ. Other operations are the same as those of the first embodiment.

According to the present embodiment, the circular motion motor 49 is provided at a position distant from the shaft 10, which is the center of rotation of the turntable 46, so that the turntable 46 Since the rotation driving force can be generated, the torque required of the circular motion motor 49 for performing the circular cut can be reduced. Other effects are similar to those of the first embodiment.

Third Embodiment A third embodiment of the present invention will be described with reference to FIGS. 6 and 7 show the grinding apparatus according to the present embodiment. FIG. 6 is a front view, and FIG. 7 is a side view with a part omitted.

In the present embodiment, the grinding surface is mirror-finished while creating a spherical surface on the workpiece by biaxial arc motion, and the driving mechanism for the arc motion is located at a position different from the rotation center of the arc motion. Is provided. In the following description, the same members as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

Referring to FIGS. 6 and 7, on the base 5, a T-axis turning table 55 for mounting the T-axis main body 22 of the T unit 27 along the T-axis 24 so as to be able to advance and retreat is provided. I have. T
The shaft rotation base 55 is formed in a fan shape, and is mounted on a bearing 47 such as a bearing provided on the base 5 around the shaft 10 which is the center of rotation of the arc-shaped notch. Is set on the base 5 so as to be rotatable. An arc portion 56, which is an outer peripheral surface portion of the T-axis turning table 55, protrudes outside the base 5, and the arc portion 56 includes the base 5
The teeth (not shown) for meshing with the T-axis gear 58 fixed to the shaft of the T-axis circular operation motor 57 attached to the side surface of are shown.

A bearing 59 such as a bearing is mounted on the T-axis rotating base 55 around the shaft 10, and a W-axis rotation for mounting the W-axis main body 2 of the W unit 7 via the bearing 59. A moving table 60 is rotatably provided on the T-axis rotating table 55. As a result, the T-axis turntable 55 and the W-axis turntable 60 are turned around the shaft 10 coaxially. An arc portion 61 which is an outer peripheral surface portion of the W-axis turntable 60 projects outside the base 5, and the arc portion 61 is fixed to a shaft of a W-axis arc operation motor 62 attached to a side surface of the base 5. The teeth (not shown) that mesh with the W-axis gear 63 are cut off.
The T-axis arc operation motor 57 and the W-axis arc operation motor 62 are connected to the control device 41, and the control device 41 can control the rotation speed and ON / OFF.

Next, the operation of the grinding apparatus having the above configuration will be described. The operation up to the start of the circular motion for performing the circular cut into the optical glass material 1 by the grinding wheel 21 is the same as that of the first embodiment. When the circular cutting of the optical glass material 1 is performed by the grinding wheel 21, the T-axis circular operation motor 57 is driven by the control device 41 to rotate the T-axis gear 58, and the T-axis rotating base 55 is moved to the arrow θ. Is rotated around the shaft 10 in the clockwise direction. At the same time, the W-axis circular operation motor 62 is driven by the control device 41 to rotate the W-axis gear 63, and the W-axis turntable 60 is rotated around the shaft 10 in a counterclockwise direction opposite to the arrow θ. Move. Other operations are the same as those of the first embodiment.

According to the present embodiment, the T-axis turntable 55 and the W-axis turntable 60 are turned in opposite directions, and the grinding wheel 21 and the optical glass material 1 are brought close to each other to perform arc cutting. Therefore, the working range required when creating the spherical surface 13 by making an arc cut is limited to the grinding wheel 21.
And the rotation range of the optical glass element 1, that is, the T axis 24
And the moving range of each of the W axis 4 can be halved. That is, by performing arc cutting with two axes of the T axis 24 and the W axis 4, the grinding wheel 21 for the optical glass material 1 is cut.
The operating range for performing arc cutting by
4 and 4, and a more compact grinding device can be configured. Other effects are similar to those of the first embodiment.

Fourth Embodiment A fourth embodiment of the present invention will be described with reference to FIGS. 8 and 9 show the grinding apparatus according to the present embodiment. FIG. 8 is a front view, and FIG. 9 is a side view with a part omitted.

In this embodiment, the grinding surface is simultaneously made mirror-finished while creating a spherical surface on the workpiece by two-axis circular motion, and the two-axis circular motion is performed by one driving mechanism. ing. In the following description, the same members as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

8 and 9, on the base 5, a T-axis turning table 65 for mounting the T-axis main body 22 of the T unit 27 along the T-axis 24 so as to be able to advance and retreat is provided. I have. T
The shaft turntable 65 is formed in a square shape, and is rotatably provided on the base 5 via a bearing 47 such as a bearing provided on the base 5 around the shaft 10 which is the rotation center of the arc cut. ing. In addition, a pin 66 is implanted on the T-axis rotating base 65 in the vicinity of the end opposite to the T-axis main body 22 with the axis 10 passing through the spherical center O of the spherical surface 13 to be created parallel to the axis 10. ing. On the pin 66, a T-axis rack gear 67, whose teeth are cut on the surface facing the T-axis main body portion 22, is rotatably mounted. 5 is a circular motion motor 68 attached to the side
And a pinion gear 69 fixed to the shaft.

A bearing 59 such as a bearing is attached to the T-axis rotating base 65 around the shaft 10, and a square shape for mounting the W-axis main body 2 of the W unit 7 via the bearing 59. A W-axis turntable 70 is provided rotatably on the T-axis turntable 65. As a result, the T-axis turntable 65
And the W-axis turntable 70 are turned around the shaft 10 coaxially. A pin 71 is implanted in the W-axis rotating base 70 near the end opposite to the chuck 6 with the shaft 10 interposed therebetween, in parallel with the shaft 10. The pin 71 is rotatably mounted with a W-axis rack gear 72 having teeth cut on a surface opposite to the surface facing the W-axis main body 2, and the teeth are pinions fixed to a circular motion motor 68. The gear 69 is engaged. The T-axis rack gear 67 and the W-axis rack gear 72
Are engaged with the pinion gear 69 at positions opposing each other with the pinion gear 69 interposed therebetween, and the rotation of the pinion gear 69 causes the T-axis turntable 65 and the W-axis turntable 70 to rotate in opposite directions. It is supposed to. In addition, the arc operation motor 68 is connected to the control device 41,
Thus, the rotation speed and ON / OFF control can be performed.

Next, the operation of the grinding apparatus having the above configuration will be described. The operation up to the start of the circular motion for performing the circular cut into the optical glass material 1 by the grinding wheel 21 is the same as that of the first embodiment. When the circular cutting of the optical glass material 1 is performed by the grinding wheel 21, the circular motion operation motor 68 is driven by the control device 41 to rotate the pinion gear 69 clockwise, so that the T axis engaged with the pinion gear 69 is rotated. By moving the rack gear 67,
Rotate the T-axis turntable 65 clockwise in the direction of the arrow
About the center. At this time, the pinion gear 69
The W-axis rack gear 72 meshing with the T-axis rack gear 67 moves in the opposite direction to the T-axis rack gear 67, and moves the W-axis rotation table 70 with the arrow θ.
Is rotated around the shaft 10 in the counterclockwise direction, which is the opposite direction to the above. Thus, the optical glass material 1 held by the grinding wheel 21 of the T unit 27 and the chuck 6 of the W unit 7
Means that the optical glass material 1 is circularly moved in the approaching direction, and the grinding wheel 21 cuts the circular arc of the optical glass material 1. Other operations are the same as those of the first embodiment.

According to the present embodiment, the T-axis turntable 65 and the W-axis turntable 70 are turned in the opposite directions, and the grinding wheel 21 and the optical glass material 1 are brought close to each other to perform arc cutting. Therefore, the working range required when creating the spherical surface 13 by making an arc cut is limited to the grinding wheel 21.
And the rotation range of the optical glass element 1, that is, the T axis 24
And the moving range of each of the W axis 4 can be halved. Further, the rotation of the W-axis 4 and the T-axis 24 can be performed by the circular operation motor 68 as one drive device, and the rotation of the W-axis 4 and the T-axis 24 can be performed by one drive device. An error in the dynamic speed can be eliminated. Other effects are
This is the same as in the first embodiment.

[0063]

As described above, according to the grinding apparatus of the first aspect of the present invention, by applying a voltage to the electrophoretic phenomenon electrode and the grinding stone, the electrophoretic phenomenon is utilized.
By grinding the optical glass material while attaching the polishing particles to the grindstone, shape creation and mirror finishing can be performed simultaneously.

According to the grinding apparatus of the present invention according to claim 2, in addition to the effect of claim 1, it is possible to arbitrarily set the radius of curvature of the surface shape created on the optical glass material and to reduce the thickness. Grinding can be performed by setting arbitrarily.

Further, according to the grinding apparatus of the present invention according to claim 3, in addition to the effect of claim 1, a surface shape is created on a surface into which the optical glass material is cut, and a surface on which polishing fine particles are attached is created. The surface can be mirrored.

According to the grinding apparatus of the present invention, the created surface can be mirror-finished.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram for explaining a basic configuration of the present invention.

FIG. 2 is a front view showing the first embodiment of the present invention.

FIG. 3 is a partially omitted cross-sectional view showing the first embodiment of the present invention.

FIG. 4 is a front view showing a second embodiment of the present invention.

FIG. 5 is a partially omitted cross-sectional view showing Embodiment 2 of the present invention.

FIG. 6 is a front view showing a third embodiment of the present invention.

FIG. 7 is a partially omitted cross-sectional view showing Embodiment 3 of the present invention.

FIG. 8 is a front view showing a fourth embodiment of the present invention.

FIG. 9 is a partially omitted cross-sectional view showing Embodiment 4 of the present invention.

FIG. 10 is a cross-sectional view showing a conventional technique.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 optical glass material 2 W-axis main body 3 W-axis motor 9, 46 turntable 11, 68 arc-movement motor 13 spherical surface 21 grinding wheel 22 T-axis main body 23 T-axis motor 25 grinding wheel side surface 26 grinding wheel front surface 31 electrophoresis phenomenon Electrode for power 35 Power supply 37 Nozzle 39 Supply device 40 Abrasive 41 Control device 49 Motor for circular motion 55 T axis rotary table 60 W axis rotary table 62 Motor for W axis circular operation 65 T axis rotary table

Claims (4)

[Claims] 1. A grinding device for grinding an optical glass material with a grindstone, wherein the grindstone having conductivity, means for holding the grindstone, an electrode for electrophoresis provided near the grindstone, and the electrode A power supply for applying a voltage with the cathode as the anode and the grindstone as an anode; a polishing liquid supply unit for supplying a polishing liquid containing negatively charged polishing particles between the electrode and the grinding stone; and the optical glass material. Means for holding, and along the shape of the surface to be created in the optical glass material, means for simultaneously moving the whetstone or the optical glass material or the whetstone and the optical glass material, Features grinding equipment. 2. The means for holding the whetstone comprises means for holding the whetstone in a reciprocable and rotatable manner, and the means for holding the optical glass material holds the optical glass material in a reciprocable and rotatable manner. 2. The grinding apparatus according to claim 1, further comprising means for performing grinding. 3. The grinding wheel, wherein a surface into which the optical glass material is cut and the polishing fine particles are adhered using an electrophoretic phenomenon, and an optical surface cut by the cut fine particles with the attached polishing fine particles. The polishing apparatus according to claim 1, further comprising: a surface that mirrors a surface of the glass material. 4. The grinding apparatus according to claim 1, wherein the fine particles for polishing are silica or cerium oxide.