JPH0811044A - Grinding and polishing device - Google Patents

Abstract

PURPOSE:To greatly reduce the cost for a grinding wheel and the set-up time, execute the grinding and polishing with one device, and reduce the machining cost. CONSTITUTION:A motor 3 to transmit the rotational force and a motor 4 to transmit the sliding force on the axis of rotation are provided on the rear end of a work holder 2 to hold a work 1. The position of the work holder 2 is precisely controlled by a laser beam length measuring machine 5 installed in the vicinity thereof. A tool holder 8 where the center 6 of curvature of the work 1 is the center axis 7 of sway is arranged on the position opposite to the work holder 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grinding / polishing device for creating a spherical surface of an optical element such as a lens by using a wheel-shaped grindstone.

[0002]

2. Description of the Related Art Conventionally, as a polishing apparatus for creating a spherical surface such as a lens, there is an invention described in Japanese Patent Publication No. 6-22799. As shown in FIG. 5, the above-mentioned invention is configured such that an upper shaft 72 that holds a lens 71 rotatably around an axis and a polishing dish 73 are held coaxially, and that they can be rotationally driven via a drive device 74. Lower shaft 75, mechanism 76 for swinging lower shaft 75 with an angular amplitude, and mechanism 76 and lower shaft 75
Is provided with a mechanism (not shown) for linearly moving in a direction orthogonal to the upper shaft 72, and the center line of each of the upper shaft 72 and the lower shaft 75 has the same radius of curvature. The upper shaft 72 and the lower shaft 75 are configured to control the angular swing and the rectilinear movement so that they intersect.

In the polishing apparatus having the above structure, the lens 71 is polished by the relative sliding between the lens 71 and the polishing dish 73 due to the mutual rotation.

[0004]

However, the above-mentioned prior art has the following problems. In other words, in order to create the spherical surface of the work piece, it is necessary to accurately process the curvature of the grindstone up to the approximate value of the curvature of the spherical surface of the work piece to be obtained. If changed, it is necessary to process the grindstone into a grindstone that matches the curvature of the workpiece each time, and there is a problem that the setup takes a very long time. In addition, this equipment can only perform polishing, and generally must perform grinding before polishing, which requires equipment for grinding, and there are many processing steps, resulting in processing cost. It's getting higher.

The object of claims 1, 2 and 3 is to grind and polish a workpiece having any curvature by processing the spherical surface of the workpiece with a wheel grindstone.
Depending on the shape of the work piece, it is not necessary to prepare a grindstone each time, and the setup time can be dramatically reduced. Furthermore, since the grinding / polishing grindstone can be done by one piece of equipment, the processing cost can be greatly reduced. is there.

[0006]

According to the present invention, there is provided a work holder for holding and rotating a workpiece, a tool holder for holding and rotating and moving a grindstone, and a feeding means for bringing the grindstone into contact with the workpiece. A grinding / polishing device, comprising: a positioning means for aligning a swing center axis of the tool holder with a curvature center of a workpiece.

[0007]

According to the operations of claims 1, 2 and 3, the workpiece is attached to the work holder, the center of curvature of the workpiece is matched with the swing center of the tool holder, and the swing center position is adjusted by the required radius of curvature. The spherical surface of the work piece is created by sending the wheel-shaped grindstone to the distant position while rotating and rocking. Further, after grinding the work piece with the grinding wheel, the grinding wheel is changed to a grinding wheel having the same shape as the grinding wheel, and the same operation as described above is performed, so that the grinding / polishing processing can be performed by one apparatus. .

[0008]

1 to 4 show the present embodiment, FIG. 1 is a front sectional view, FIG. 2 is a side sectional view, FIG. 3 is an explanatory view showing a processing state of a convex lens, and FIG. 4 is a processing state of a concave lens. FIG.

At the rear end of the work holder 2 for attaching the work piece 1 to the front end, a motor 3 for transmitting a rotational force and a motor 4 for transmitting a sliding force on the rotation axis are provided.
The work holder 2 is a laser length measuring machine 5 installed in the vicinity.
The position is precisely controlled by. Work holder 2
A tool holder 8 having a center of curvature 6 of the workpiece 1 as a swing center axis 7 is arranged at a position opposite to. The work piece 1 is held by the work holder 2, and is positioned at a position where the swing center axis 7 of the tool holder 8 and the center of curvature 6 of the work piece 1 coincide with each other.

The tool holder 8 is constructed as follows. A tarai portion 9 having a semicircular plate shape that is swingable around a swing center shaft 7 and a motor 10 that transmits a swing force at an arbitrary angle are engaged with the tarai portion 9. At the center of the tarai part 9, the material is made of metal bond and the diameter of the workpiece 1 is 1
A wheel-shaped grindstone 11 having a diameter of / 2 to 1/5 is provided at the tip, a rotational force is transmitted from a motor 12, and a feed motor 13 slides on a rotation axis intersecting with the swing center axis 7. A controlled wheel holder 14 is provided.

The operation of this embodiment will be described below with reference to FIGS. 3 and 4. The rotating wheel-shaped grindstone 11 is positioned at a position separated from the center of curvature 6 by the radius of curvature R of the workpiece 1. Here, the wheel-shaped grindstone 1
The tool holder 8 including 1 swings while maintaining a predetermined angle. In this state, the wheel-shaped grindstone 11 is fed to make a predetermined cut in the workpiece 1. At this time, grinding is performed with the wheel-shaped grindstones 11 of the grinding meshes # 100 to # 1200, and then with the wheel-shaped grindstone 11 of the polishing meshes # 3000 to # 10000 having the same shape. A spherical shape can be obtained.

According to this embodiment, since the wheel-shaped grindstone 11 can be used for general purposes, it is not necessary to produce a dedicated grindstone for each shape of the workpiece 1. Further, since it is not necessary to sequentially mount a dedicated grindstone, the setup time is greatly reduced.

[0013]

Example 2 This example is different in that the wheel-shaped grindstone 11 made of metal bond in the above-mentioned Example 1 is abolished, and a wheel-shaped grindstone made of resin is used instead.
Other configurations are composed of the same components, and the description of the configurations is omitted.

This embodiment has the same operation as that of the first embodiment, and the description of the operation will be omitted.

According to this embodiment, since the wheel-shaped grindstone is made of resin, the surface roughness of the machined surface of the workpiece is improved.

[0016]

[Third Embodiment] In this embodiment, the wheel-shaped grindstone 11 made of metal bond in the first embodiment is eliminated, and instead, the material of the wheel-shaped grindstone is formed by compressing an abrasive, which can be used as a polishing process. Differently, the other configurations are composed of the same components, and the description of the configurations is omitted.

The operation of this embodiment is similar to that of the first embodiment, and the description of the operation is omitted.

According to the present embodiment, it is possible to carry out the polishing process by using the wheel-shaped grindstone in which the abrasive material is compressed and formed.

[0019]

[Fourth Embodiment] In this embodiment, the wheel-shaped grindstone 11 made of metal bond in the first embodiment is abolished, and instead, the material of the wheel-shaped grindstone is made of urethane, and an abrasive is supplied during processing. It is different in that it is configured by providing a mechanism (not shown), and other configurations are composed of the same components, and the description of the configuration will be omitted.

In this embodiment, polishing is performed while supplying an abrasive during processing. Other operations are the same as those in the first embodiment, and the description thereof will be omitted.

According to the present embodiment, the wheel-shaped grindstone is made of urethane, and the polishing can be performed by supplying the abrasive and performing the processing.

[0022]

According to the effects of the present invention according to claims 1, 2 and 3, it is not necessary to produce a dedicated grindstone according to the curvature of the workpiece, and the grindstone cost and the setup time can be greatly reduced. Further, grinding and polishing can be performed by one unit, and the processing cost can be reduced.

[Brief description of drawings]

FIG. 1 is a front cross-sectional view showing a first embodiment.

FIG. 2 is a side sectional view showing the first embodiment.

FIG. 3 is an explanatory diagram of the first embodiment.

FIG. 4 is an explanatory diagram of the first embodiment.

FIG. 5 is a side sectional view showing a conventional example.

[Explanation of symbols]

 1 Workpiece 2 Work holder 3, 4, 10, 12, 13 Motor 5 Laser length measuring machine 8 Tool holder 9 Tarai part 11 Wheel-shaped grindstone 14 Wheel holder

Claims (3)

[Claims] 1. A work holder that holds and rotates a workpiece, a tool holder that holds and rotates a grindstone, a feeding means that brings the grindstone into contact with the workpiece, and a swing center of the tool holder. A grinding / polishing device comprising: a shaft and a positioning means for aligning a center of curvature of a workpiece. 2. The grinding / polishing device according to claim 1, wherein a laser length measuring machine is used as a positioning means for aligning the swing center axis of the tool holder and the curvature center of the workpiece. 3. The grinding / polishing device according to claim 1, wherein the grindstone held by the tool holder is a wheel-shaped grindstone having a diameter of 1/2 to 1/5 of the diameter of the workpiece. .