JPS6213143B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a spherical lapping device, and more particularly to a spherical lapping device suitable for lapping a spherical body made of a hard and brittle member.

[Technical background of the invention and its problems]

Spheres are widely used as a component of equipment in various technical fields, and in particular, spheres made of hard and brittle materials such as ceramics can be used for special purposes that take advantage of their corrosion, heat, and wear resistance properties. Attention has been paid. Generally, these spheres are required to have good sphericity and a predetermined diameter, and various lapping devices have been developed to accommodate this requirement. FIG. 1 shows an example of this, which includes a pair of upper and lower lap plates 1a and 1b facing each other, a hydraulic loading device 2 attached to the upper lap plate 1a, and a rotational drive device (for rotating the lower lap plate 1b). (not shown) is inserted between the upper and lower lap plates 1a and 1b with the workpiece sphere S held in an annular recess 3 formed in the lower lap plate 1b, and the upper lap plate is inserted into the workpiece sphere S. A predetermined load is applied by the loading device 2 via the lower lap plate 1a, and the lower lap plate 1b is rotated for processing. That is, due to the above-mentioned load and rotation, the spherical body S to be processed is machined while rolling in the annular recess 3 while being pressed against both the inner and outer surfaces of the annular recess 3 and the lap surface 4 of the upper lap plate 1a.

However, in such processing equipment, the loading device 2
It is difficult to accurately control the load over a wide range from low loads to high loads, and therefore it is not easy to apply to hard and brittle parts whose sphericity, diameter, machining efficiency, etc. change under delicate load conditions. . Furthermore, the conventional loading device 2, such as a hydraulic type, has the disadvantage that it is difficult to maintain accuracy due to its structure due to thermal deformation and the like.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a sphere machining device for accurately lapping a sphere made of a hard and brittle member.

[Summary of the invention]

A holding part for holding the workpiece sphere is provided in the lap part consisting of a pair of upper and lower lap plates facing each other, and a magnetic force generating device with adjustable magnetic flux is used to apply the required lap to the workpiece sphere via the pair of lap plates. It is designed to be able to carry loads.

[Embodiments of the invention]

As shown in FIG. 2, the sphere processing device includes a pair of upper and lower lap plates 10a, which are made of magnetic members and are opposed to each other.
10b, and these wrap plates 10a, 10b are connected to rotating shafts 11a, 11b, respectively.
The rotary drive devices 12a and 12b rotate in opposite directions through the rotary drive devices 12a and 12b. The sphere S to be processed is held in an annular recess 13 formed in the lower lap plate 11b and inserted between the pair of lap plates 10a and 10b. The annular recess 13 is a V-shaped groove in cross section with two inclined side surfaces formed concentrically with the rotation axis 11b of the lower lap plate 10b, and is far from the rotation center of the lower lap plate 10b as shown in FIG. The outer inclined side surface 14a is a lap plate surface 15 having a recess formed from the inner inclined side surface 14b.
It has a steep slope with respect to (α>β). However,
Each rotating shaft 1 of the pair of lap plates 10a, 10b
Around 1a and 11b, wrap plates 10a and 1
Magnetic force generators 16a and 16b made of electromagnets that form an attractive magnetic field between 0b and 0b are provided, and coils 17a and 17b of each electromagnet are connected to a power supply device via a current regulator 18, and a pair of lap plates 10a and 1
The strength and direction of the magnetic field formed between 0b and 0b can be freely adjusted and changed. Thus, the workpiece sphere S inserted between the pair of lap plates 10a, 10b is pressurized by the attractive magnetic field formed between the lap plates 10a, 10b by the magnetic force generators 16a, 16b. Note that 19 is a damper device having a coil spring 20 for adjusting the load due to the attractive magnetic field applied to the spherical body S to be processed.

However, in the sphere processing device having the above configuration,
In the lapping process, the magnetic force generators 16a and 16b are demagnetized, the gap between the pair of lapping plates 10a and 10b is widened, and the annular recess 1 of the lower lapping plate 10b is
3. Place the sphere S to be processed into the container. Thereafter, the pair of lap plates 10a, 10b are brought close to each other and inserted between the pair of lap plates 10a, 10b. Next, a predetermined current is passed through the magnetic force generators 16a and 16b to generate an attractive magnetic field of a required strength between the pair of lap plates 10a and 10b, and the above-mentioned sphere to be processed S
While pressurizing the rotary drive devices 12a, 12
b, the pair of lap plates 10a and 10b are rotated in opposite directions, and the spherical body S to be processed is rolled along the annular recess 13. If a lapping agent is appropriately supplied during this rotational drive, the spherical object S to be processed can be lapping processed.

According to this machining device, the pressure on the spherical body S to be machined is performed by the magnetic force generator, so the lap load on the spherical body S to be machined can be accurately controlled by accurately controlling the current flowing through the coils 17a and 17b of the electromagnet. Moreover, it can be controlled easily and quickly, and the spherical object to be processed can be processed with high precision. In addition, since the annular recess 13 in which the processed sphere S rolls is formed of inclined surfaces with different angles on the inside and outside, the rotation direction of the processed sphere S can be constantly changed.
As a result, a spherical body with higher sphericity can be obtained. Further, the outer inclined side surface 14 of the annular recess 13
Since a is formed to be more steeply inclined than the inner inclined side surface 14b, even if the wrapping plates 10a and 10b are rotated at high speed, the processed sphere S will not fall off from the processing device, and the scattering of the wrapping agent will be reduced. Highly efficient processing can be performed.

Next, other embodiments will be described.

In FIG. 4, in addition to an annular recess 13 formed in the lower lap plate 10b, a plate-shaped spacer 30 is arranged between a pair of upper and lower lap plates 10a and 10b as a holding part for the spherical body S to be processed. . This spacer 30 is connected to the annular recess 1 as shown in FIG.
A plurality of holes 31 having a diameter smaller than the diameter of the sphere S to be processed are bored at equal intervals on the circumference having the same diameter as 3, and the sphere S to be processed is fitted into the holes 31 to be machined. This is what I did.

If the spacer 30 is arranged in this way, even if a plurality of workpiece spheres S are arranged in the annular recess 13,
By correctly regulating their mutual positions, the spheres can be prevented from coming into contact with each other during processing, and the desired spheres S without chipping can be easily produced.

In Fig. 6, the upper lap plate 10a is made of a permanent magnet with one magnetic pole on the lap plate surface side, and the lower lap plate 10b is made of a magnetic material, and a magnetic force generator 16b made of an electromagnet is attached to this. It is something.

Such a processing device controls the direction and magnitude of the current flowing through the magnetic force generator 16b, forms a repulsive magnetic field between the pair of lap plates 10a and 10b, widens the gap between them, and causes the spherical object S to pass through the processing device. In addition, it is possible to form an attractive magnetic field and process with an arbitrary load, and the loading device can be simplified.

In the above embodiment, the upper lap plate 10a was made of a permanent magnet and the lower lap plate 10b was made of a magnetic member.
Conversely, the lower lap plate may be made of a permanent magnet and the upper lap plate may be made of a magnetic member.

Furthermore, in each of the above embodiments, the lower lap plate 10
An annular recess 13 for holding the workpiece sphere S is formed in b, but this annular recess is attached to the upper lap plate or
The annular recess may be formed in both the upper and lower lap plates, or a plurality of annular recesses may be formed instead of one. Furthermore, the annular recess may be eccentric with respect to the rotation axis of the lap plate. Also, it is only necessary to rotate either the upper or lower lap plate.

〔Effect of the invention〕

A magnetic force generator is provided, and the magnetic field formed between the pair of upper and lower lap plates applies a load to the sphere to be machined, making it possible to accurately and easily/quickly apply the required lap load to the sphere to be machined. Since the annular recess is made of sloped surfaces with different inclination angles, the direction of rotation of the workpiece sphere can be constantly changed, and even if the lap plate is rotated at high speed, the workpiece sphere will not fall off or flop. Since the scattering of the agent is reduced, the sphere can be processed with high precision and high efficiency.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway sectional view of a conventional sphere processing device, Fig. 2 is a partially cutaway sectional view of an embodiment of the present invention, and Fig. 3 is a partially cutaway sectional view of a conventional sphere processing device. FIG. 4 is a cross-sectional view showing the main parts of another embodiment of the present invention, FIG. 5 is a diagram of the spacer of the device shown in FIG. 4, and FIG. FIG. 3 is a cross-sectional view showing the main parts of another embodiment other than the illustrated device. S: Sphere to be processed, 10a: Upper lap plate, 10
b: Lower lap plate, 12a, 12b: Rotary drive device, 13: Recessed portion, 16a, 16b: Magnetic force generator.

Claims (1)

[Claims] 1. A lower lap plate in which an annular recess is formed to hold the sphere to be processed, and the lower lap plate is arranged on the side where the recess is formed, and the lower lap plate and the sphere to be processed held in the recess are lapped. an upper lap plate, a rotation drive device for rotating at least one of the upper lap plate and the lower lap plate to roll the processed sphere in the recess, and the upper lap plate and the lower lap plate. A magnetic field that attracts each other is formed between the upper lap plate and the lower lap plate to clamp the sphere to be processed, apply a lap load to the sphere to be machined, and adjust the lap load by adjusting the magnetic field. and a magnetic force generating device that generates magnetic force by adjustment, and the recess is composed of an outer inclined side surface and an inner inclined side surface, and the outer inclined side surface is smaller than the inner inclined side surface with respect to the main surface on which the recess is formed. A sphere processing device characterized by being formed with a steep slope.