JP2609190B2 - Internal polishing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for polishing an inner surface of a non-magnetic workpiece having a circular inner surface.

[0002]

2. Description of the Related Art A polishing tool made of a magnetic material is disposed in a space defined by the inner surface of a workpiece having a circular inner surface such as a pipe, and the polishing is performed by a magnetic field rotating around the workpiece. It has been proposed to grind the inner surface of a workpiece by rotating a tool for grinding (Journal of the Japan Society of Precision Engineering, No. 55).
Vol. 10, pp. 148-153).

[0003]

According to the polishing method,
The inner surface of the workpiece can be polished. On the other hand, since the polishing tool itself must be a magnetic material, its application is limited.

An object of the present invention is to provide an inner surface polishing apparatus capable of polishing the inner surface of a workpiece without limiting the tools used.

[0005]

SUMMARY OF THE INVENTION The present invention is an apparatus for polishing an inner surface of a workpiece having a circular inner surface. The polishing apparatus includes a rotor rotatably disposed in a space defined by the inner surface, and a rotor that is non-rotatably attached to the rotor, contacts the inner surface, and rotates with the rotor. Two sets of tools arranged to be pressed toward the inner surface, and two sets of tools also serving to support the rotor, and two sets of tools arranged so as to surround the workpiece, and an electric motor coupled with the rotor And a magnetic field generation unit that forms

[0006] Two sets of tools are attached with the rotor interposed,
Both the tools are arranged in a space defined by the inner surface of the workpiece, and are positioned radially inward of the magnetic field generator. afterwards,
When a current is applied to the magnetic field generator, the rotor rotates and the tool grinds the inner surface.

Since the rotor and the tool are formed separately and the rotor forms an electric motor in combination with the magnetic field generating portion, there is no restriction on the material of the tool, and a wide range of materials for the tool can be selected. Further, since the outer diameter of the rotor and the tool can be set to an arbitrary size, there is substantially no restriction on the diameter of the workpiece. Therefore, it is possible to polish a workpiece having a large diameter to a workpiece having a small diameter.

[0008] The two sets of tools are formed so as to be pressed against the inner surface, and also serve to support the rotor, so that a predetermined amount of polishing can be efficiently performed, and furthermore, in order to support the rotor. No special parts are required. Therefore, preparation work when the inner surface of the non-workpiece should be polished
It is only necessary to place two sets of tools in the workpiece with the rotor interposed therebetween, and the preparation work is simple.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Prior to description of an inner surface polishing apparatus according to the present invention, a polishing method will be described with reference to FIGS. The workpiece 10 is formed of a non-magnetic material such as stainless steel having an inner surface 11 having a circular cross section.

First, a tool 14 integrated with the rotor 12 is arranged in the space defined by the inner surface 11 and is brought into contact with the inner surface 11. At this time, the tool 14 is pushed outward by, for example, a spring 16, and is brought into contact with the inner surface 11 while a load is applied to the tool 14.

After arranging the rotor 12 and the tool 14 at predetermined positions, a magnetic field generator 18 which forms an electric motor together with the rotor 12 is arranged so as to surround the workpiece 10.
In this case, the magnetic field generation unit 18 equally surrounds the workpiece 10 in the circumferential direction outside in the radial direction.

Thereafter, the magnetic field generating section 18 is energized to rotate the rotor 12 to rotate the tool 14, thereby polishing the inner surface 11.

The inner surface polishing device is a device for polishing the inner surface 11 of the workpiece 10 having a circular inner surface 11, and includes a rotor 12, two sets of tools 14, and a magnetic field generator 18.

The rotor 12 is rotatably arranged in a space defined by the inner surface 11 of the workpiece 10. Rotor 12
Can have the same structure as that used for the electric motor. Therefore, as shown in FIG. 4, a massive iron core type (a) in which mild steel is formed into a disc shape 12a, a can type (b) in which copper 13c is fitted in a silicon steel plate 12b having a notch on the outer periphery, and a permanent magnet is formed in mild steel 12d. A permanent magnet type (c) provided with 12e, a hysteresis type (d) having a cylindrical permanent magnet 12g attached to mild steel 12f, and a mild steel salient pole type (e) formed by forming mild steel 12h into an elongated shape, with a notch on the outer periphery One such as a short-circuit winding type (f) in which a coil 12j is wound around a silicon steel plate 12i having the same.

Two sets of tools 14 are arranged with the rotor 12 interposed therebetween, support the rotor 12, and are mounted non-rotatably on the rotor 12 so as to contact the inner surface 11 of the workpiece 10, and Rotate.

In the embodiment shown in FIG. 2, the tools 14 are formed in an arc shape, and three tools 14 are arranged in a circumferential direction on each side of the rotor 12 to form a set. The tool 14
It is made of abrasives such as cloth and whetstone.

In the embodiment shown in FIGS. 1, 2 and 5a, a backup 15 is applied to
, And cylindrical mounting portions 20 project from both sides of the rotor 12, and three cylindrical arms 21 are mounted on each mounting portion 20 so as to be movable in the radial direction. The backup 15 is fixed to the arm 21 at the center.
The tool 14 receives a load by the coil spring 16 disposed between the mounting portion 20 and the backup 15, and
It is being pressed towards.

Another means for pressing the tool 14 against the inner surface 11 can be formed as shown in FIG. That is, the weight 22 is attached to the backup 15 and the arm 21 supporting the tool 14 to increase the weight, and the tool 14 is pressed against the inner surface 11 by using the centrifugal force generated by the rotation of the rotor (b). Or backup 15 and arm 21
Instead of providing the weight 22 to the
The tool 14 is pressed against the inner surface 11 by the buoyancy caused by the air flow applied to the movable wing 24 (c).

In the embodiment shown in FIG. 1, a pair of support members 28 disposed on both sides of the rotor 12 are attached to a rod 26 penetrating the rotor 12, and the support member 28
2 is rotatably supported. Mounting part 2 for rotor 12
0, the rod 26 is connected non-rotatably and in a state where it is prevented from coming off, while the rod 26 and the support member 28 are rotatably connected via a bearing (not shown).
An O-ring 30 is arranged on the outer periphery of the support member 28. When the rotor 12 is supported by two sets of tools and the rotor 12 is also supported by a pair of support members 28, it is particularly suitable for precision polishing.

As shown in FIG. 6, a pair of retainers 34 are mounted on the rod 26 connected to the rotor, and a cylindrical iron core 36 is movably mounted inside each retainer 34, and three or more cores are provided. Is disposed between the pair of iron cores 36. A ball groove 37 is provided in an outer peripheral portion of the iron core 36 facing the ball 38 so that the ball 38 is positioned and the coil 40 is arranged so as to surround the workpiece 10. When a direct current is applied to the coil 40, the pair of iron cores 36 attracts each other, and presses the ball 38 toward the inner surface 11 of the workpiece 10. Thereby, it is possible to cope with the rotation of the workpiece 10 and the rotation of the rotor.

According to the embodiment shown in FIG.
By changing the distance between 6, 6 or the size of the ball 38, the difference in the diameter of the inner surface 11 of the workpiece 10 can be dealt with. Further, the circulation of the slurry can be effectively performed.

The magnetic field generator 18 is arranged so as to surround the workpiece 10 and forms an electric motor in combination with the rotor 12. In the embodiment shown in FIGS. 1 to 3, the magnetic field generator 18 includes an annular yoke 42 made of a magnetic material and a yoke 42.
Six electromagnets 4 equally spaced in the circumferential direction
4. The yoke 42 is attached to a frame 48 by a plurality of brackets 46 so that the center axis extends in a substantially horizontal direction.

The electromagnet 44 is formed by winding a coil 52 around an iron core 50. Each iron core 50 is radially attached to the yoke 42 at an axial distance from the yoke 42 by a connecting portion 54 provided on the yoke 42, and is magnetically connected to the yoke 42. The tip surfaces, or pole faces, of the plurality of iron cores 50 jointly define a space therein for receiving the non-workpiece 10.

The yoke 42, the electromagnet 44, and the rotor 12
Thus, an electric motor is formed in the same manner as a conventional electric motor. This electric motor may be of an induction type or of a synchronous type, and a three-phase AC or a single-phase AC is used.

As shown in FIG. 7, a drive mechanism 60 for supporting the long workpiece 10 on the frame 48, moving the workpiece 10 in the axial direction thereof, and rotating the workpiece 10 about the axis. Is arranged. As in this example,
If the workpiece 10 is rotated, the polishing rate can be increased.

The drive mechanism 60 has a slider 62 movable in a direction parallel to the center axis of the yoke.
Are supported on a rail assembly 64 fixed to the frame 48. The rail assembly 64 has a pair of rails 66 supported by a pair of brackets 68 fixed to the frame 48. A slider 66 is movably supported by the pair of rails 66.

The chuck 70 for holding the workpiece 10 is
It is arranged on a pair of support portions 72 extending upward from the slider 62 in parallel with each other, and is rotatably supported by bearings (not shown). The chuck 70 has a pulley 78, and is rotated by a belt 80 stretched between the chuck 70 and a pulley 76 attached to a shaft of an electric motor 74 disposed on the slider 62.

A cam 84 is connected to a shaft of an electric motor 82 disposed on a frame 48, and a crank 86
4 and the slider 62 are swingably connected to each other. Therefore, the slider 62 is moved by the cam 84, and the chuck 70 is rotated by the belt 80.

The end of the rod 26 extending from the rotor is attached to the holding plate 90 so as to be rotatable and prevented from coming off, and the holding plate 90 is fixed to the frame 48. This prevents the rotor from moving together with the workpiece 10, and positions the rotor inside the magnetic field generator 18.

The coil 52 of the electromagnet 44 of the magnetic field generator 18
In order to generate a rotating magnetic field from the pole face of the iron core 50,
For example, supply three-phase alternating current. A rotating magnetic field is generated, and with the movement, the rotor 12 rotates and the tool 14 grinds the inner surface. At the same time, the workpiece 10 is rotated in a direction opposite to the rotation direction of the rotor 12, and the slider 62 is moved in the axial direction.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a main part of an embodiment of an inner surface polishing apparatus according to the present invention.

FIG. 2 is a sectional view taken along line 2-2 of FIG.

FIG. 3 is a front view showing a magnetic field generating unit.

FIG. 4 is a front view showing a model of a rotor.

FIG. 5 is a front view showing a means for pressing a tool against an inner surface of a workpiece.

FIG. 6 is a side view showing a portion that rotatably supports a rotor.

FIG. 7 is a perspective view showing a mechanism for rotating a workpiece and simultaneously moving the workpiece in an axial direction.

[Explanation of symbols]

 Reference Signs List 10 Workpiece 11 Inner surface 12 Rotor 14 Tool 18 Magnetic field generator

Claims (1)

(57) [Claims] An apparatus for polishing said inner surface of a workpiece having a circular inner surface, said rotor being rotatably disposed in a space defined by said inner surface, and being non-rotatably mounted to said rotor. Two sets of tools that are arranged in contact with the inner surface and rotate together with the rotor, and that are formed so as to be pressed toward the inner surface and that also serve as supports for the rotor. An inner surface polishing apparatus, comprising: a tool; and a magnetic field generating unit disposed so as to surround the workpiece and forming an electric motor in combination with the rotor.