JP2002046050A - Grinding wheel grooving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily perform grooving with the uniform depth even for a very small grinding wheel. SOLUTION: This grinding wheel grooving device is provided with a holder receiver 5 for holding a support body 2 connected to a grinding wheel 1 through a holder 3 and for moving the grinding wheel 1 by an adjusting screw 6 through the holder 3 in the central axial direction, a turning base 8 having the holder receiver 5 and a turning shaft 8a perpendicular to the central axis of the grinding wheel 1, a disc-shaped thin-bladed grinding wheel 12 having a rotary shaft parallel to the turning shaft 8a of the turning base 8 and having the outer periphery positioned so as to be abut on the tip central part of the grinding wheel 1, and a moving table 10 capable of adjusting the positional relationship between the thin-bladed grinding wheel 12 and the grinding wheel 1 by moving the grinding wheel in the direction perpendicular to the rotary shaft of the thin-bladed grinding wheel 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grindstone grooving device for forming a groove on a surface of a grindstone used for grinding and polishing optical elements and the like.

[0002]

2. Description of the Related Art A surface for processing a grindstone used for grinding and polishing of an optical element or the like (hereinafter referred to as a processing surface) includes:
Grooves are provided for removing heat generated during processing and discharging grinding (polishing) debris.

[0003] Conventionally, this groove has been disclosed in
No. 48695 is disclosed. As shown in FIGS. 10 and 11, the disclosed grindstone 30 has a large number of grooves 32 extending radially from the center of the grinding portion of the processing surface 31 toward the periphery. Note that FIG.
FIG. 4 is a sectional view taken along line C of FIG.

[0004] These grooves 32 may be formed by machining such as a milling machine or a cutting machine, or may be formed by electric discharge machining with a grindstone using a metal bond.

[0005]

However, a minute whetstone,
For example, when a groove is formed on a whetstone having a convex spherical shape with an outer diameter of 1 mm and a radius of curvature of 1 mm, the groove width must be set to about 0.1 mm.

Further, the depth of the groove formed on the processing surface is linear (for a grinding wheel having a convex spherical surface, the groove at the center is deep,
If the groove is formed to the outer peripheral edge of the processing surface, the groove depth at the center becomes large,
The strength of the grindstone is reduced, causing a problem such as bending or breakage, which lowers the surface accuracy of the optical element to be processed. Therefore, a uniform depth along the R surface of the processed surface (for example, , 0.1 mm).

For this reason, conventional machining is difficult, and the material of the grindstone is limited in electric discharge machining.
There is a problem in that it is not easy to groove a commonly used grindstone.

The present invention has been made in view of the above-mentioned problems of the prior art, and provides a grindstone grooving apparatus capable of easily performing grooving with a uniform depth even with a minute grindstone. The purpose is to:

[0009]

According to a first aspect of the present invention, there is provided a grinding wheel grooving apparatus for forming a groove on a surface of a grinding wheel to be processed, A work holder that holds the work stone and is capable of moving the work stone in the direction of the central axis thereof, and a turning base having the work holding part and having a rotation axis orthogonal to the center axis of the work stone. And a disk-shaped thin blade grindstone having a rotation axis parallel to the rotation axis of the rotation base, the outer peripheral portion of which is located at a position where it contacts the center of the tip of the grinding wheel to be processed, and the rotation of the thin blade grindstone. Move in a direction perpendicular to the axis,
A moving mechanism capable of adjusting a positional relationship between the thin blade grindstone and the grindstone to be processed.

According to a second aspect of the present invention, in the whetstone grooving device according to the first aspect, the turning base can be moved in a direction orthogonal to a moving direction of the moving mechanism. A vertical movement mechanism.

Further, in the grinding wheel grooving apparatus according to claim 3 of the present invention, in the grinding wheel grooving apparatus according to claim 1 or 2, the grinding wheel to be processed can be rotationally positioned around its central axis. And

According to the first aspect of the present invention, the grindstone held by the work holding portion is moved in the direction of its central axis, and the center of curvature of the processing surface of the grindstone and the turning axis of the turning base are moved. To match. Then, the grindstone is moved together with the turning base in the direction of the thin blade grindstone by the moving mechanism, and the rotating thin blade grindstone is cut into the processing surface of the grindstone by a predetermined depth. By turning around the turning axis, that is, turning the grindstone around the center of curvature of the processing surface, a groove having a uniform depth can be formed on the processing surface.

Further, according to the configuration of the second aspect of the present invention, a groove having a uniform depth from the tip of the grinding stone can be formed on the grinding stone having a flat or concave spherical processing surface.

Further, according to the configuration of the third aspect of the present invention, a plurality of grooves can be easily formed around the center of the processing surface (the center of the tip of the grindstone to be processed).

[0015]

(Embodiment 1) Embodiment 1 of the present invention will be described with reference to FIGS. 1, 2 and 3. FIG. FIG. 1 is a plan view showing a grindstone grooving device, FIG. 2 is a front view showing a grindstone grooving device, FIG. 3 shows a grindstone after grooving, and FIG. FIG. 3 (b)
FIG. 3 is a sectional view taken along line AA of FIG.

In FIG. 1 and FIG.
A grindstone 1 having a convex spherical tip as a grindstone to be used for polishing (the outer diameter of the grindstone 1 is about 0.5 mm to 10 mm)
Is fixed to the center of the cylindrical support 2 by an adhesive or the like, and is fixed in a state of protruding from one end side of the support 2.

Support 2 integrated with grinding wheel 1 by bonding
Is fitted and held in a circular concave portion 3 a formed at the end of the prismatic holder 3 on the opposite side to which the grindstone 1 is coupled, and is fixed to the holder 3 by a set screw 4. The support 2 is rotatable around the center axis of the support 2 in the recess 3 a of the holder 3 by loosening the set screw 4.

The prism-shaped holder 3 is slidably fitted and held in a groove 5a of a holder holder 5 as a work holding portion having a square groove 5a having an open upper side.
One end of the holder 3 (support 2
(The side opposite to the side on which the lens is held) can be moved in the left-right direction in the figure by an adjustment screw 6 such as a micrometer head. The holder 3 can be fixed to the holder backing 5 by a set screw 7. By fixing the holder 3 moved by the adjustment screw 6 by the set screw 7, the grindstone 1 is fixed.
(Especially, the tip of the grindstone 1) can be positioned.

A holder base 5 is mounted on a turning base 8 (FIG. 2) mounted on a rotary table 9 (a front surface in FIG. 2) having a horizontal rotation axis orthogonal to the moving direction of the holder 3.
At the front). The turning base 8 can turn around a turning axis 8a coaxial with the turning axis of the turntable 9, and the grindstone 1 connected to the support 2 held via the holder uke 5 and the like also has a center on the turning axis 8a. Is to be turned. Swivel axis 8a of swivel base 8
The positional relationship between the wheel 3 and the center of curvature of the spherical surface of the tip of the grinding wheel 1 can be adjusted by moving the holder 3 in the left-right direction with the adjusting screw 6, and in the figure, the turning shaft 8a of the turning base 8 (A state in which the center of curvature of the spherical surface of the tip of the grinding wheel 1 is matched). The turntable 9 is configured to perform a turning operation by turning the handle 14, and is capable of transmitting rotation between, for example, orthogonal rotation axes.

The rotary table 9 is installed on a moving table 10 arranged on an apparatus base 17. The moving table 10 is moved by a feed screw 11 such as a micrometer head in the left-right direction in FIG.
a can be moved in a horizontal direction orthogonal to a.
Cuts and separates from the thin blade 12 to be described later, so that the positional relationship between the thin blade 12 and the grindstone 1 can be adjusted. The moving mechanism includes a moving table 10 and a feed screw.

The thin blade 12 has a disk shape and a grinding wheel shaft 13 having a rotating axis parallel to the rotating shaft 8a of the rotating base 8.
At a position where its outer peripheral surface can abut on the center of the tip of the grindstone 1, it can be rotated about the center of the disk by a motor (not shown) or the like. That is, the center of rotation of the thin blade grindstone 12 coincides with the center of curvature of the spherical surface of the tip of the grindstone 1 in the horizontal direction (the vertical position in FIGS. 1 and 2), and the turning shaft 8
It is rotated so as to be orthogonal to a.

Further, the vicinity of the contact between the thin blade whetstone 12 and the whetstone 1 can be enlarged and observed with a microscope (not shown) or the like.

The operation of the grindstone grooving device having the above configuration will be described. First, the support 2 integrated with the grindstone 1 is fitted into the recess 3 a of the holder 3, and the set screw 4 is tightened to fix the support 2 to the holder 3.

Next, the holder 3 to which the grindstone 1 is fixed is fitted into the groove 5a of the holder base 5 and is held by the holder base 5. Then, the holder 3 is moved by the adjusting screw 6 and the center of curvature of the convex spherical surface at the tip of the grindstone 1 is made to coincide with the turning axis 8a of the turning base 8 while observing with a microscope (not shown).
The holder 3 is fixed to the holder base 5 by tightening the set screw 7.

Next, the thin blade whetstone 12 attached to the tip of the whetstone shaft 13 is rotated by a motor (not shown) and the like.
The moving table 10 is moved by the feed screw 11, and the center of the tip of the grindstone 1 is brought into contact with the outer peripheral surface of the thin blade grindstone 12. Further, by moving the moving table 11, a notch of a predetermined depth is formed at the tip of the grindstone 1.
Given by 2.

Next, the rotary table 9 is rotated by the handle 14 and the swivel base 8 is swiveled to a predetermined angle about the swivel shaft 8a. 3 is turned to form a groove 1a having a uniform depth on the spherical surface of the tip of the grindstone 1 as shown in FIG. 3 (b). The processed groove 1a is, as shown in FIG.
It is a straight line passing through the center of the tip of the whetstone 1.

After processing the groove 1a, once the moving table 1
0 is moved by the feed screw 11 in the direction opposite to the moving direction of the moving table 10, and the grindstone 1 is separated from the thin blade grindstone 12.

Subsequently, the set screw 4 of the holder 3 is loosened, and the support 2 integrated with the grindstone 1 can be rotated in the recess 3a of the holder 3. Then, by rotating the support 2 by a predetermined angle, the grindstone 1 is rotated to a position where the grooving process is to be performed next at the tip of the grindstone 1, and the set screw 4 is tightened again to maintain the state, and the holder 3 is rotated. Is fixed to the support 2.

Thereafter, by performing groove processing in the same procedure as the above-mentioned procedure, a straight line inclined at a predetermined angle with respect to the groove 1a about the center of the tip of the grindstone 1 on the spherical surface of the tip of the grindstone 1 is formed. A new groove 1a is newly formed. Then, by repeating this groove processing several times, a required number of grooves 1a are formed on the tip of the grindstone 1. In the present embodiment, three grooves 1a are processed.

When the groove is machined, the position of the holder 3 is adjusted by moving and fixing the holder 3 with respect to the holder 5 with the adjusting screw 6 (that is, the center of curvature of the spherical surface at the tip of the grindstone 1 coincides with the turning shaft 8a of the turning base 8). The position adjustment to be performed) may be performed only once for the first time even when processing a plurality of grooves 1a.

According to the present embodiment, the turning shaft 8a of the turning base 8 and the center of curvature of the spherical surface of the tip of the grindstone 1 are made to coincide with each other, and the thin blade 12 is cut into the tip of the grindstone 1 at a predetermined depth. In this state, the turning base 8 is turned to a predetermined angle by the turning shaft 8a.
By turning around the center and performing grooving at the tip of the grindstone 1 with the thin blade grindstone 12 that does not move, even the minute grindstone 1 can easily form the groove 1a having a uniform depth.

Further, after one groove is formed, the grindstone 1 is rotated to perform the next grooving process, so that a plurality of grooves 1a having a uniform depth are inclined at a predetermined angle (for example, a uniform angle). Can be easily formed. At this time, with the holder 3 fixed to the holder holder 5,
Is simply rotated with respect to the holder 3 so that the center of curvature of the tip surface of the grinding wheel 1 and the turning shaft 8a of the turning base 8 do not need to be adjusted each time. Grooving can be easily performed.

In this embodiment, the grindstone 1 is moved to make a cut in the grindstone 1, but the same effect can be obtained by moving the thin blade grindstone.

(Embodiment 2) Embodiment 2 of the present invention will be described with reference to FIGS. 4 is a plan view of the grindstone grooving device, FIG. 5 is a front view of the grindstone grooving device, FIG. 6 shows a grindstone, a support and a holder, and FIG. 6 (b) is a left side view of FIG. 6 (a), FIG. 7 is an explanatory view showing grooving of the grindstone, FIG. 8 shows the grindstone after grooving, and FIG. 8 (a) FIG. 8B is a view from the tip side of the grindstone, FIG. 8B is a sectional view taken along the line BB of FIG. 8A, and FIG. 9 is a central longitudinal sectional view showing the grindstone after grooving.

In this embodiment, as in the first embodiment, the holder 3 as a work holding member for fitting and holding the support 2 to which the grindstone 1 is connected, as shown in FIG. It has a prismatic shape consisting of a square. At one end of the square end surface, a concave portion 3a for fitting the support 2 is formed at the center thereof. When the grindstone 1 is mounted on the holder 3 via the support 2, the tip of the grindstone 1 is formed. The center part and the center line of the holder 3 match.

The rotary table 9 is installed on a movable table 15 which can be moved vertically by a feed screw 16 such as a micrometer head.
Is installed on a movable table 10 that can move in the left-right direction. That is, the grindstone grooving device of the present embodiment enables the grindstone 1 to move in the left-right direction,
It is configured to be movable in the vertical direction. The vertical movement mechanism includes a movement table 15 and a feed screw 16. Other configurations are the same as those of the first embodiment,
The same portions are denoted by the same reference numerals, and description thereof will be omitted.

The operation of the grindstone grooving device having the above configuration will be described. First, the support 2 integrated with the grindstone 1 is fitted into the recess 3 a of the holder 3, and the set screw 4 is tightened to fix the support 2 to the holder 3.

Next, the holder 3 to which the grindstone 1 is fixed is fitted into the groove 5a of the holder base 5 and is held by the holder base 5. Then, the holder 3 is moved by the adjusting screw 6 and the center of curvature of the spherical surface of the tip of the grindstone 1 is made coincident with the turning axis 8 a of the turning base 8 while observing the enlarged view with a microscope (not shown) and the set screw 7 is tightened. Thus, the holder 3 is fixed to the holder skeleton 5.

Next, the thin blade whetstone 12 attached to the tip of the whetstone shaft 13 is rotated by a motor (not shown) and the like.
The moving table 10 is moved by the feed screw 11, and the center of the tip of the grindstone 1 is brought into contact with the outer peripheral surface of the thin blade grindstone 12. Further, by moving the moving table 10, a notch of a predetermined depth is formed at the tip of the grindstone 1.
Given by 2.

Next, the turntable 9 is rotated by the handle 14 and the turning base 8 is turned to a predetermined angle about the turning shaft 8a, so that the grinding wheel is centered on the center of curvature of the spherical surface at the tip of the grinding wheel 1. 7 is turned, and as shown in FIG. 7A, a groove 1a having a uniform depth is formed on the spherical surface of the tip of the grindstone 1 in the vertical direction.

After processing the groove 1a, the moving table 1
0 is moved by the feed screw 11 in the direction opposite to the moving direction of the moving table 10, and the grindstone 1 is separated from the thin blade grindstone 12.

Subsequently, the set screw 7 of the holder 5 is loosened, the holder 3 integrated with the grindstone 1 is removed from the holder 5 via the support 2, and the holder 3 is removed as shown in FIG.
7B is rotated 90 ° from the state shown in FIG. 7B to the state shown in FIG. 7B, and then fitted again into the groove 5a of the holder base 5. The set screw 7 is tightened to fix the holder 3 to the holder base 5.

Thereafter, a groove 1a is newly formed in the vertical direction on the spherical surface of the tip of the grindstone 1 by performing groove processing in the same procedure as described above. Thereby, two orthogonal grooves 1a as shown in FIG. 8 are formed.

The above-mentioned grooving is performed by using a whetstone 1 having a convex spherical tip.
In the following, grooving processing is performed on a grindstone 18 having a flat tip (see FIG. 9A) and a grindstone 19 having a concave spherical surface (see FIG. 9B). The case will be described. In addition, the grindstones 18 and 19 in FIG.

The process is the same as that of the grinding wheel 1 until the cutting edge of a predetermined depth is provided by the thin blade grinding wheel 12 at the tip of the grinding wheels 18 and 19. Then, after the cut of the predetermined depth is given, the moving table 15 is moved up and down a predetermined distance by the feed screw 16 without turning the turning base 8 to move the grindstones 18 and 19 only in the up and down direction, Whetstone 1
Grooves 18a, 19a having a uniform depth are formed at the tips of 8, 19, respectively. When the grooves orthogonal to the grooves 18a and 19a are formed, the holder 3 is set to 90
Then, the movable table 15 is moved in the up and down direction after it is rotated and a cut of a predetermined depth is given.

According to the present embodiment, the holder 3 is formed in a prism shape having a square cross section,
Is fixed to the holder uke 5, and after one grooving process, the holder 3 is rotated by 90 ° and fixed again to the holder uke 5, and the grindstone 1 is fixed.
By performing the grooving process, two orthogonal
Grooving of books can be easily performed.

Further, since the moving table 15 which can move up and down is provided so that the grindstone can be moved up and down, a cut of a predetermined depth is given to the grindstone and then the grindstone is moved up and down as shown in FIG. Even on the grindstone 18 having a flat tip and the grindstone 19 having a concave spherical surface, a groove having a uniform depth can be formed from the tips of the grindstones 18 and 19.

The technical idea having the following configuration is derived from the above-described specific embodiment. (Supplementary Note) (1) In a grindstone grooving device that makes a rotating grindstone abut on a grindstone (work) to be processed and forms a groove on a surface on which the grindstone is grinded, a work holding unit that holds the work is provided.
A turning base that can turn around the vicinity of the contact position between the work and the rotating grindstone, and a turning axis that is parallel to the turning axis of the turning base, and an outer peripheral portion of which contacts the center of the tip of the work; And a disk-shaped thin blade that is the rotary whetstone, and a move that can be moved in a direction perpendicular to a rotation axis of the thin blade whetstone to adjust a positional relationship between the thin blade whetstone and the work. And a mechanism.

(2) The grinding wheel grooving apparatus according to (1), wherein the work holding section holds the work via a work holding member that rotatably holds the work.

(3) The grinding wheel grooving device according to appendix (2), wherein the workpiece holding member has a square cross section.

According to the grinding wheel grooving apparatus of the additional description (1), grooving with a uniform depth can be easily performed even with a minute grinding wheel.

According to the grindstone grooving apparatus of the supplementary note (2), the work is rotated while the work holding member is being held by the work holding section, so that a plurality of grooves having a uniform depth can be formed at the tip of the work. It can be done easily.

According to the grindstone grooving device of the supplementary note (3), orthogonal grooving can be easily performed by rotating the work holding member 90 ° with respect to the work holding portion and holding it.

[0054]

As described above, according to the first aspect of the present invention,
According to the whetstone grooving device according to the above, it is possible to easily perform a grooving process with a uniform depth even with a minute whetstone to be processed.

According to the grinding wheel grooving device of the second aspect of the present invention, even if the tip of the minute grinding wheel has a convex spherical surface or a flat or concave spherical surface, it is possible to easily perform the grooving with a uniform depth. It can be carried out.

According to the grinding wheel grooving device of the third aspect of the present invention, a plurality of grooves passing through the center of the tip of the grinding wheel to be processed can be easily machined at a uniform depth.

[Brief description of the drawings]

FIG. 1 is a plan view showing a grindstone grooving device according to a first embodiment of the present invention.

FIG. 2 is a front view showing the grinding wheel grooving device according to the first embodiment of the present invention.

FIG. 3 shows a grindstone after grooving by the grindstone grooving device according to the first embodiment of the present invention. FIG. 3 (a) is a view from the tip side of the grindstone, and FIG. It is AA sectional drawing of 3 (a).

FIG. 4 is a plan view showing a grindstone grooving device according to a second embodiment of the present invention.

FIG. 5 is a front view showing a grindstone grooving device according to a second embodiment of the present invention.

6A and 6B show the holder of the grindstone grooving device according to the second embodiment of the present invention together with the grindstone and the support. FIG. 6A is a diagram viewed from the tip of the grindstone, and FIG. It is a left view of a).

FIG. 7 is an explanatory diagram showing a time of grooving by a grinding wheel grooving device according to a second embodiment of the present invention.

8A and 8B show a grindstone after grooving by the grindstone grooving device according to the second embodiment of the present invention, wherein FIG. 8A is a view from the tip side of the grindstone, and FIG. It is BB sectional drawing of a).

FIG. 9 is a central longitudinal sectional view showing a grindstone after grooving by the grindstone grooving device according to the second embodiment of the present invention.

FIG. 10 is a view showing a whetstone of a conventional example, viewed from the tip side of the whetstone.

11 is a cross-sectional view taken along the line CC of FIG. 10 of a conventional grindstone.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Whetstone 2 Support 3 Holder 4, 7 Set screw 5 Holder 6 Adjustment screw 8 Rotation base 8a Rotation axis 9 Rotary table 10, 15 Moving table 11, 16 Feed screw 12 Thin blade whetstone 13 Grindstone axis 14 Handle

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Koji Ishizaki 2-43-2 Hatagaya, Shibuya-ku, Tokyo F-term in Olympus Optical Co., Ltd. (reference) 3C049 AA03 AB01 AB06 CA01 CB01

Claims (3)

[Claims] 1. A whetstone grooving device for forming a groove on a surface on which a grindstone to be processed is to be ground, comprising: a work holding portion that holds a whetstone to be processed and can move the whetstone to be processed in a central axis direction; A rotation base having a rotation axis orthogonal to a center axis of the grinding wheel; a rotation axis parallel to the rotation axis of the rotation base; A disk-shaped thin blade grindstone located in contact with the center of the tip of the grindstone, and can be moved in a direction orthogonal to the rotation axis of the thin blade grindstone to adjust the positional relationship between the thin blade grindstone and the grindstone to be processed. A whetstone grooving device, comprising: a moving mechanism. 2. The grindstone grooving device according to claim 1, further comprising a vertical moving mechanism capable of moving the turning base in a direction orthogonal to a moving direction of the moving mechanism. 3. The grinding wheel according to claim 1, wherein said grinding wheel is rotatable about a central axis thereof.
Or a grindstone grooving device according to 2.