JPH02284874A - Grinding stone - Google Patents

Abstract

PURPOSE:To enable accurate continuous work of spherical surface grinding, chamfering and outside diameter grinding to be achieved with a workpiece lens left as mounted to a work spindle by forming a ring-shaped grinding stone part in a point end part of a grindstone main unit forming in its peripheral part a grindstone part for the chamfering and the outside diameter grinding. CONSTITUTION:By moving a point end of a ring-shaped grinding stone part 12, tilting by an angle alpha for the axial line of a spindle 16, to a position where the point end passes through the axial line of the spindle 16, a lens 14 is ground and formed into a spherical surface. Next by a grinding part 13, a peripheral part of the lens 14 is ground, thereafter it is chamfered by the grinding part 13 coming into contact with the ground spherical surface and a ridgeline of an outside diameter at a desired chamfering angle.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a grinding wheel used in a spherical grinder for grinding and creating a spherical surface of a lens or the like.

[Conventional technology]

As an example of a conventional grinding wheel, a grinding wheel according to Utility Model Application No. 43-47009, which was previously proposed by the applicant, will be described below with reference to FIGS. 5 and 6.

That is, the grinding wheel shown in FIGS. 5 and 6 has a diamond grindstone 2 fixed to the tip opening 1a of a rotary cylinder 1 that rotates together with a main shaft 9a that rotates at a constant angle, and a diamond grindstone 2 fixed to the tip opening 1a of the rotary cylinder 1. A ring-shaped nut 3 or a bowl-shaped nut 6 is screwed onto the threaded portion 1b provided in the holder, and a diamond grindstone 5 is fixed to the nut 3 or 6 on the side or inner side of the nut 3 or 6, respectively, on which the grindstone 2 is attached.
Tightening is accomplished by screwing a nut 4 onto the threaded portion 1b of the rotary cylinder body 1.

Thus, the curved surface 7a or 8a of the workpiece 7 or 8 attached to the workpiece shaft 9b is ground by the grindstone 2 formed at the center of the rotary cylinder 1, and the corner part 7b or 8b of the workpiece 7 or 8 is ground by the outer grindstone 5. 2 [Problem to be Solved by the Invention] However, in the grinding wheel according to Utility Application No. 43-47009, compared to the outer peripheral grinding wheel 5 which performs corner chamfer polishing, The central grindstone 2 that processes curved surfaces has a large amount of grinding and wears quickly.

Therefore, as the central grindstone 2 wears out, it is difficult to accurately and stably process a desired curvature unless the processing position conditions of the grindstone shaft (angle with respect to the workpiece axis, amount of lateral movement, etc.) are corrected.

Moreover, when the machining position conditions of the grindstone shaft are corrected, the angular dimension of the corner chamfer that is being simultaneously machined also changes at the same time. That is, if an attempt is made to maintain stable curvature, the angular dimension of the corner chamfer changes, resulting in the disadvantage that stable corner chamfering cannot be maintained.

In addition, this type of spherical grinder cannot grind the outer diameter of the workpiece because the main axis is tilted in one direction (to the right in Figures 5 and 6) with respect to the workpiece axis. . In order to perform outer diameter grinding, a new device must be designed and equipped that can tilt the machine to the opposite side.

Furthermore, the grinding wheel shown in Fig. 6 has a bowl-shaped nut 6.
This has the disadvantage that the grinding fluid is obstructed from being supplied from the outer periphery, leading to the occurrence of burns due to lack of the grinding fluid in the grinding section, and that good grinding cannot be expected.

The present invention was developed in view of the problems with the conventional grinding wheels, and an object of the present invention is to provide a grinding wheel that can stably process spherical surfaces and chamfers with high precision, and can also perform grinding on the outer diameter part. This is the purpose.

[Means and actions for solving the problem] Figure 1 a, b
1 shows a conceptual diagram of the grinding wheel of the present invention.

As shown in the figure, the grinding wheel lO of the present invention has a grinding wheel main body 11 that is detachably fixed to a main shaft (not shown) that rotates by a rotary movement mechanism, and a grinding wheel for spherical grinding at the tip of this grinding wheel main body 11. The grindstone portion 12 is formed into a ring shape.

Further, a grindstone portion 13 for grinding the outer periphery is formed on the outer periphery of the grindstone main body 11 .

When processing the lens 14 using the grinding wheel 10 having such a configuration, the processed lens 14 is fixed to the lens holder 15 with an adhesive and the lens holder 15 is chucked by the spindle 16. The lens 14 is held on a spindle 16 via a lens holder 15, and the spindle 16 itself is configured to rotate and move freely in the axial direction, so that the lens 14 is rotated and moved in the axial direction by the rotation and axial movement of the spindle 16. 14 can be rotated and moved axially.

Therefore, the grinding wheel 10 having the above-mentioned configuration has the above-mentioned lens 14.
First, the cent is placed in state A in FIG. 1a.

The set state of the grinding wheel 10 is as shown in FIG. The spherical surface is generated.

Thereafter, the grinding wheel lO is set relative to the lens 14 in the state shown in B in FIG. 1a.

In this set state of the grinding wheel 10, the grinding part 13 is attached to the lens 1.
By moving the lens 14 to a position where the outer periphery of the lens 4 is to be ground, the outer periphery of the lens 14 is ground.

Furthermore, the grinding wheel 10 is set to state C in FIG.

This set state of the grinding wheel 10 is such that chamfering is performed by bringing the grinding portion 13 into contact with the ridgeline of the spherical surface and the outer diameter at a desired chamfering angle, which were machined in the cent states A and B of FIG. 1a. It is.

Therefore, each position A, B, and C of the grinding wheel 10
The positions of are each independent, and by correcting each position, the radius of curvature and the shape of the five chamfers on the outer diameter can be independently corrected.

For example, if the grindstone portion 12 wears out, the radius of curvature will change, but if the position of A is corrected, only the radius of curvature will be corrected.

In addition, the grinding wheel 10 can be moved quickly and accurately to the positions A, B, and C using a spherical grinding machine equipped with an NG packing device.

〔Example〕

Examples of the grinding wheel of the present invention will be specifically described below with reference to the drawings.

(First Example) Figures 2a and b show the first example of the grinding wheel of the present invention, and Figure 2a is a partially omitted vertical cross-sectional view, showing the spherical surface, chamfering, and outer diameter machining state. FIG. 2 is a partially enlarged view of the grinding section.

The grinding wheel 17 shown in FIG. 2A includes a grinding wheel main body 19 that is detachably fixed to a rotating main shaft 22 of a spherical grinder (not shown), and a ring-shaped grinding wheel portion 20 at the tip of the grinding wheel main body 19. , and a grindstone portion 21 is formed on the outer periphery of the grindstone main body 19.

As shown in FIG. 2, the grindstone portion 21 includes a cylindrical grinding surface portion 21c, and upper and lower chamfered grinding surface portions 21b formed continuously at the upper and lower portions of the cylindrical grinding surface portion 21c.
and 2. ld, and this grinding surface portion 21 with a chamfered top shape.
It is formed by each surface part of the disc-shaped grinding surface part 21a continuous to b.

Further, the grindstone parts 20 and 21 can be formed with different structures as the grindstones, for example, the diameter of each abrasive grain, the bond, the degree of concentration, the degree of bonding, etc., as necessary.

Further, the lens 18 is attached to the lens holder 15 with adhesive.
The lens holder 15 is fixed to the lens holder 15 and held by a spindle 16 which is rotatably and axially movable.

Note that the lens holder 15 is chunked into a spindle 16.

Further, the lens 18 is set to move by a predetermined amount in the axial direction of the spindle 16 while being rotated by the operation of the spindle 16.

Thus, the grinding wheel 17 is in the state shown in A of FIG.
By moving the tip of the ring-shaped grindstone portion 20 to a position passing through the axis of the spindle 16, the grinding wheel 17 of the lens 18 is set at position B in FIG. 2a. That is, it is set parallel to the axis of the spindle 16, and the grinding surface part 21c of the grindstone part 21 cuts the outer peripheral part 18d of the lens 18, the surface part 21b cuts the chamfered part 18b of the lens 18, and the grinding part 21a cuts the lens 18. 18
18a of planes can be ground respectively.

Furthermore, the grinding wheel 17 is moved in the direction of its rotation axis (in the upper direction in FIG. 2a), and the grinding surface portion 21 of the grinding wheel portion 21 is
d allows the chamfered portion 18d of the lens 18 to be ground.

According to the grinding wheel 17 of this embodiment, spherical surface creation and chamfering,
In addition to outer diameter grinding, it is possible to chamfer the number of planes and the back side of the spherical surface.

(Second Embodiment) FIG. 3 is a longitudinal sectional view showing a second embodiment of the grinding wheel of the present invention.

The grinding wheel 23 of this embodiment has a ring-shaped grinding wheel portion 2.0 formed at the tip of a grinding wheel main body 24, a threaded portion on the outer periphery of the grinding wheel main body 24, and a cylindrical cup-shaped support member 25. A threaded portion is provided on the inside of the portion, and the outer peripheral edge of the ring-shaped tip opening of the cup-shaped support member 25 is shown enlarged in FIG. A grindstone part 2 having the same configuration as the grindstone part 21
7, and the cup-shaped support member 25 is removably attached to the whetstone body 24 by screwing the threaded part of the cylindrical part into the threaded part of the whetstone body 24 and simultaneously screwing the lock nut 26. It is configured.

The other configurations are the same as those of the first embodiment, are given the same numbers, and the explanation thereof will be omitted.

Therefore, the grinding wheel 2 having the above configuration of the embodiment
The lenses held on the spindle 16 via the lens holder 15 by the grinding wheels 20 and 27 by movement at the set positions of FIG. 3, that is, the positions of A and B in FIG. It can be implemented.

In particular, due to the structure of the grinding wheel 23, the cup-shaped support member 25 is screwed onto the threaded portion of the grinding wheel body 24 and attached so that the grinding wheel portion 20 and the grinding wheel portion 27 can be disposed on substantially the same plane. As a result, it is possible to configure the grindstone section 20 so that it does not protrude forward (downward in the drawing) from the grindstone section 27 when grinding the outer diameter of the lens, and the height of the lens holder 15 can be configured to be short.

That is, the fact that the height of the lens holder 15 can be shortened means that the dimensional accuracy of the height of the lens holder 15 is improved, and accordingly, the accuracy of the center thickness of the lens 1B can be improved.

The inclination of the lens holder 15 during grinding becomes smaller,
The machining dimensional accuracy of the lens 18 is improved.

Furthermore, since the cup-shaped support member 25 is removable,
By replacing this, it can easily be used for processing other lenses.

(Third Embodiment) FIG. 4 is a longitudinal sectional view showing a third embodiment of the grinding wheel of the present invention.

The grinding wheel 23 shown in the fourth figure is the grinding wheel 2 of the second embodiment.
In the configuration of No. 3, the configuration of the grindstone portion 27 provided at the outer peripheral edge of the tip opening of the cup-shaped support member 25 is different.

That is, on the outer circumferential edge of the tip opening of the cup-shaped support member 25, there is a cylindrical ground surface section 21C' whose length is approximately half that of the cylindrical ground surface section 21c shown in FIG.
A grindstone portion 27' is formed by a grinding surface portion 21b connected to the grinding surface portion 21°C and having a chamfered top shape and a disk-shaped grinding surface portion 21a continuous thereto.

The shape of this grindstone portion 27° is the portion below the imaginary line indicated by the dotted chain in the structure of the grindstone portion 27 in FIG.
This corresponds to a configuration in which a portion (a part of the outer diameter ground surface portion 21c and the bottom chamfered ground surface portion 21d) is removed.

The rest of the structure is the same as that of the second embodiment, and the same components are given the same numbers and the explanation thereof will be omitted.

Further, the lens 18 is held on the spindle 16 by being chucked by a claw 28a of a chuck 28 attached to the tip of the spindle 16.

Thus, the grinding wheel 23 according to the embodiment described above can perform the required processing on the lens 18 using the grinding wheel portion 20 and the grinding wheel portion 27° at each position shown in FIGS. 4A and 4B.

In particular, according to the grinding wheel 23, when the outer periphery of the lens 18 is held by a claw such as a three-sided chunk or a collet chuck, the outer diameter portion not held by the claw can be chamfered.

〔Effect of the invention〕

As is clear from the above description, according to the grinding wheel of the present invention, spherical surface, chamfering, and outer diameter machining can be performed continuously with high accuracy while the lens to be processed is mounted on the work shaft.

In addition, since the axes of the spherical surface, chamfer, and outer diameter are the same, the centering process of outer diameter grinding centered on the optical axis, which is performed after lens polishing, can be omitted, reducing processing equipment and man-hours. can be reduced.

[Brief explanation of drawings]

Fig. 1 a, b is a conceptual diagram of the grinding wheel of the present invention, Fig. 2 a, b
2 shows the first embodiment of the grinding wheel of the present invention, FIG. 2 a is a partially omitted longitudinal cross-sectional view, and also shows the spherical surface, chamfering, and outer diameter machining state, and FIG. 2 shows the part of the grinding part. Enlarged view, 3rd
Figure 4 is a vertical cross-sectional view showing a second embodiment of the grinding wheel of the present invention.
The figure is a longitudinal sectional view showing the third embodiment of the grinding wheel of the present invention, and the fifth embodiment.
FIG. 6 and FIG. 6 are longitudinal sectional views showing a conventional grinding wheel. 10.17.23... Grinding wheel 11.22.24... Grinding wheel body 12.13, 20.21.27.27°... Grinding wheel part 1
4 18...Lens 15...Lens holder 16...Spindle 28...Chanok diagram (Figure 1') Figure

Claims (2)

[Claims] (1) A ring-shaped grinding wheel part formed at the tip of the grinding wheel body of a grinding wheel of a spherical grinder that grinds and creates a spherical surface of a lens, etc.;
A grinding wheel comprising a chamfer formed on the outer periphery of the grinding wheel body and an outer diameter grinding wheel portion. (2) In a grinding wheel for a spherical grinder that grinds and creates a spherical surface of a lens, etc., a ring-shaped grinding wheel portion formed at the tip of the grinding wheel body;
A grinding wheel comprising a cup-shaped grindstone portion which is detachably provided on the outside of the grindstone body and has a chamfered outer peripheral portion and an outer diameter grinding wheel portion.