JPH071301A - Polishing method and polishing tool - Google Patents

Abstract

(57) [Summary] [Object] To provide a polishing method and a polishing tool in which an orbital radius is increased and thereby polishing quality is also improved. The polishing method of the present invention is a polishing method using an even number of polishing members 6, and the even number of polishing members 6 are arranged so that centrifugal force with respect to a reference point O is balanced, and then the polishing members are polished. The member 6 is revolved around the same point O. Further, the polishing tool of the present invention comprises an even number of polishing members 6, a holding member 20, and a driving means M such as a motor. The polishing member 6 has a shaft member on the surface opposite to the polishing surface. 7 is provided, the polishing member 6 is rotatably held by the holding member 20 in a positional relationship in which the centrifugal force with respect to the reference point O is balanced, and the holding member 20 is rotatable about the reference point O by the driving means M. The polishing unit 1 is defined as.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a polishing method and a polishing tool. More specifically, the present invention relates to a polishing method and a polishing tool which are applied to a water polishing work in painting an automobile.

[0002]

2. Description of the Related Art In automobile painting work, so-called water-polishing work is performed to improve the fixability of the top-coat paint, and the surface roughness of the paint is submicron so that the paint film is mirror-finished.

A polishing tool having a polishing section 1 shown in FIGS. 6 to 8 is used for this water polishing work. In the example shown in FIG. 6, the drive shaft 2 of the air motor or the electric motor M
The tip of the connecting member 3 is connected to the center of the connecting member 3, and one end 3a of the connecting member 3 is provided on the opposite side of the surface of the polishing member 6 having the pad 4 and the polishing element 5 on which the polishing element 5 is provided. The tip portion 7a of the shaft member 7
For example, it is rotatably connected via a ball bearing 8 and a counterweight 9 having the same weight as the polishing member 6 is connected to the other end 3b. And
Polishing with the polishing tool having the polishing unit 1 shown in FIG. 6 is performed by rotating the connecting member 3 by the motor M and rotating the polishing member 6 on the surface of the coating film on which the water film is formed by the rotating motion. . During this rotation, the polishing member 6 does not rotate, so that the polishing member 6 only revolves. That is, the polishing member 6 performs a so-called orbital motion. In addition, in FIG. 6, r shows an orbital radius.

In the example shown in FIG. 7, one end 3a of the connecting member 3 is connected to the tip 2a of the drive shaft 2 of the air motor or the electric motor M, and the other end 3b is provided with the polishing element 5 of the polishing member 6. The tip end portion 7a of the shaft member 7 provided on the side opposite to is rotatably connected via, for example, a ball bearing 8, and a casing 10 made of vibration-proof rubber is provided between the motor M and the polishing member 6. It is provided to cover the drive shaft 2 of the motor M, the connecting member 3, and the shaft member 7 provided on the polishing member 6. And
Polishing with the polishing tool having the polishing unit 1 shown in FIG. 7 is performed in the same manner as the polishing tool shown in FIG.

In the example shown in FIG. 8, the polishing member 6 is directly connected to the tip 2a of the drive shaft 2 of the air motor or the electric motor M. The polishing with the polishing tool having the polishing unit 1 shown in FIG. 8 is performed by causing the polishing member 6 to rotate on the surface of the coating film having the water film formed thereon by the motor M.

However, the polishing tools having the polishing portion 1 shown in FIGS. 6 to 8 have the following drawbacks.

That is, in the example shown in FIG. 6, the counterweight 9 is provided in order to balance the centrifugal force, but its mounting position cannot be at the same level as the polishing member 6 due to structural restrictions. . Therefore, as shown in FIG. 9, even imbalance occurs. At the same time, minute vibrations are generated in the polishing member 6 due to the even / unbalance. As a result, there arises a problem that the polishing performance is deteriorated and the quality of the coating film surface is deteriorated. The arrow in FIG. 9 indicates the direction of action of centrifugal force.

With respect to polishing, it is known that increasing the speed of the polishing surface improves the polishing quality of the coated surface. Therefore, it is necessary to increase the polishing rate in order to improve the polishing quality. Here, as a method of increasing the speed of the polishing surface, there are a method of increasing the orbital radius r (see FIG. 6) and a method of increasing the rotation speed of the motor M. However, when the orbital radius r is increased, the above-mentioned even-balance is increased, which rather deteriorates the polishing quality of the coating surface. Further, when the rotation speed of the motor M is increased, even at present, the bearing is rotated at a high speed of about 7,000 RPM, which is close to the maximum allowable rotation speed of the bearing. Therefore, if the rotation speed is further increased, the life of the bearing becomes remarkable. Another problem of degradation and damage arises.

In the example shown in FIG. 7, since vibration-proof rubber is used for the casing 10, there is a problem in durability. Further, since the polishing member is revolved without using the counterweight 9, the orbital radius is smaller than that of the polishing tool shown in FIG. 6 because it is necessary to reduce the adverse effect of the centrifugal force of the polishing member 6 on the polishing surface. There is also a problem that the polishing speed cannot be increased and the polishing quality cannot be improved.

In the tool shown in FIG. 8, since the polishing member 6 rotates, the speed differs between the central portion and the peripheral portion of the polishing surface, and there is a problem that uniform polishing quality cannot be obtained.

As described above, since the conventionally used polishing tools have their respective problems, it is desired to develop a polishing tool or a polishing method having improved polishing characteristics.

[0012]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems of the prior art, and provides a polishing method and a polishing tool in which the orbital radius is increased and thereby the polishing quality is also improved. Is intended.

[0013]

The polishing method of the present invention is a polishing method using an even number of polishing members, wherein the even number of polishing members are arranged so that the centrifugal force with respect to a reference point is balanced, and thereafter. It is characterized in that these polishing members are revolved around the same point.

In the polishing method of the present invention, two polishing members are used and they are arranged linearly, and the midpoint thereof is used as a reference point, or four polishing members are used and they are cross-shaped. It is preferable that the reference point is located at the intersection of the crosses.

On the other hand, the polishing tool of the present invention comprises an even number of polishing members, holding members and drive means, and the polishing member is provided with a shaft member on the surface opposite to the polishing surface thereof.
The polishing member has a polishing portion that is rotatably held by the holding member in a positional relationship in which centrifugal force with respect to a reference point is balanced, and the holding member is rotatable about the reference point by driving means. Characterize.

In the polishing tool of the present invention, two polishing members are used, the shaft members of which are rotatably held at both ends of the linear holding member, and the holding member is driven by the driving means to move its midpoint. Four polishing members are used, which are rotatable as the center, and the shaft member is rotatably held at each tip of the cross-shaped holding member, and the holding member is driven by the driving means to the cross-shaped holding member. It is preferable to be able to rotate around the intersection of the cross.

Further, in the polishing tool of the present invention, it is preferable that a rotation regulating means is added, and the rotation of the polishing member is regulated by the rotation regulating means.

Here, as the rotation regulating means, for example, a sun gear having the same rotation center as the rotation center of the holding member,
A gear train composed of a polishing member side gear having the same number of teeth as the sun gear mounted on the shaft member of the polishing member, and an idle gear provided between the sun gear and the polishing member side gear. Is used.

[0019]

In the polishing method of the present invention, an even number of polishing members are arranged so that centrifugal forces with respect to the reference point are balanced.
Since they are orbitally moved around the same point, there is no unbalance between them. Therefore, the orbital radius can be increased, and the speed of the polished surface can be increased accordingly. Further, the polishing member does not vibrate due to unbalance. Therefore, the polishing quality of the coating film can be significantly improved. Moreover, since the polishing is performed with an even number of polishing members, the area that can be polished at one time increases, and the polishing time can be shortened. In other words, the life of the polishing element can be extended. Therefore, the replacement frequency of the polishing element can be reduced.

The polishing tool of the present invention has a large orbital radius because the polishing member is held by the holding member in a positional relationship in which the centrifugal force with respect to the reference point is in equilibrium, and therefore no unbalance occurs. Therefore, the number of rotations of the motor can be set to be lower than the conventional number of rotations, and the life of the rotating portion is increased. Also, since there is little vibration, operability is improved.

Further, in the preferred embodiment in which the rotation restricting means is provided, the rotation of the polishing member is surely prevented, so that the orbital movement becomes clear and the polishing quality is further improved.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described based on embodiments with reference to the accompanying drawings, but the present invention is not limited to such embodiments.

FIG. 1 is a schematic view of a polishing portion of a polishing tool according to a first embodiment of the present invention, FIG. 2 is a plan view of the same, FIG. 3 is an explanatory view of rotational movement of a polishing member of the same embodiment, and FIG. FIG. 5 is a plan view of the polishing section of the second embodiment of the polishing tool of FIG. 5, and FIG. 5 is a schematic view of the polishing section of the third embodiment of the polishing tool of the present invention. 1 to 5,
20, 22 are linear holding members, 30 are cross-shaped holding members,
Reference numeral 40 is a gear train, 41 is a grinding member side gear, 42 is an idle gear, 43 is a sun gear, and the same reference numerals as those in FIGS. 6 to 8 denote the same or similar elements.

Example 1 As shown in FIGS. 1 and 2, a polishing tool of Example 1 of the present invention comprises a pad 4 and a polishing element 5 such as sandpaper which constitutes a polishing surface attached to one surface thereof. Disk-shaped polishing members 6, 6 are symmetrically arranged, and the tip portions 7a of the shaft members 7, 7 hung vertically on the other surfaces of the pads 4, 4 thereof.
7a is symmetrically held by both ends 20a and 20b of the linear holding member 20, and the tip (2a) of the drive shaft 2 of the motor M is connected to the center (reference point) O of the linear holding member 20. Is to have.

Ball bearings 8 and 8 are mounted on the end portions 7a and 7a of the shaft members 7 and 7, and the casings of the bearings 8 and 8 are provided with appropriate means at both end portions 20a and 20b of the linear holding member 20. Is held by.
As a result, the shaft member 7 is rotatably held by the linear holding member 20. Further, as the motor M, an air motor, an electric motor, or the like is used. Here, the tip portion 2a of the drive shaft 2 of the motor M is directly connected to the center O of the linear holding member 20, but the shaft member is vertically provided at the center O of the linear holding member 20, and this is the power transmission. It may be connected to the drive shaft 2 of the motor M via a mechanism.

The size of the polishing member 6 will be described. The diameter of the polishing member 6 is about 70 mm, and the center distance between the polishing members 6 and 6 is about 160 mm. However, the size of the polishing member 6 is not limited to this, and may be adjusted as needed.

Since the remaining structure of the polishing section 1 is the same as that of the conventional one, its detailed description is omitted.

Since the polishing section of the polishing tool according to the first embodiment is constructed as described above, when the linear holding member 20 is rotated by the motor M, the linear holding member 2 is rotated.
The polishing member 6 rotatably held by the zero tips 20a and 20b also rotates. In this rotational movement, since the polishing member 6 is not provided with its own rotational force, the polishing member 6 does not rotate about its own axis but only revolves. That is, an orbital exercise is performed. FIG. 3 is an explanatory diagram of this orbital movement, and shows a state in which the linear holding member 20 is rotated by 90 degrees. As is clear from FIG. 3, it is understood that the polishing member 6 does not rotate.

The number of revolutions in this rotary movement is 80 mm as compared with the conventional orbital radius (about 5 mm).
Since it is significantly increased, it is set to about 1500 RPM. This rotation speed is the same as the conventional rotation speed (7000
Since it is remarkably lower than that of RPM, the life of members such as bearings in the rotating part is significantly improved. As a result, the frequency of maintenance also decreases.

When the linear shaft member 20 is rotated by the drive shaft 2, centrifugal force acts on the polishing members 6A and 6B.
Since the polishing members 6A and 6B are arranged symmetrically with respect to the reference point O of the linear holding member 20, the centrifugal forces of the two are balanced. Therefore, even and unbalance does not occur, and since the rotation speed is lower than that of the conventional one, the centrifugal force is also small and stable polishing can be achieved.

Here, in consideration of the centrifugal force, the polishing unit 1
Has a rigidity that can withstand this centrifugal force. Therefore, for example, the diameter of the shaft member 7 vertically provided at the center of the polishing member 6 is, for example, about 15 mm, and the height is 4 mm.
It is about 0 mm.

Example 2 The polishing tool of Example 2 of the present invention has the basic structure of Example 1.
Similar to, but as shown in FIG.
In place of 0, the cross-shaped holding member 30 is used, and the four polishing members 6, 6, 6, 6 are rotatably held at the tip portions 30a, 30b, 30c, 30d of the holding member 30. The difference from the first embodiment is that the tip 2a of the drive shaft 2 is connected to the cross point O of the cross of the cross-shaped holding member 30.

Also in the second embodiment, the cross-shaped holding member 30 is used.
Is rotated by the motor 2, the polishing member 6A,
Centrifugal force acts on 6B, 6C and 6D, but the polishing member 6
The centrifugal force of A balances the centrifugal force of the polishing member 6B, and the centrifugal force of the polishing member 6C balances the centrifugal force of the polishing member 6D. Therefore, as in the case of the first embodiment, even or imbalance does not occur, and since the rotation speed is lower than that of the conventional one, the centrifugal force is small, so that stable polishing can be performed.

Example 3 As shown in FIG. 5, the polishing tool of Example 3 of the present invention comprises a pad 4 and a polishing element 5 such as sandpaper attached to one surface thereof as in Example 1. The disk-shaped polishing members 6 and 6 are symmetrically arranged, and the intermediate portions of the shaft members 7 and 7 vertically provided on the other surfaces of the pads 4 and 4 are held by the tip portions 22a and 22b of the linear holding member 22. Along with
A polishing member side gear 41 is provided at the tip portions 7a, 7a, the tip portion 2a of the drive shaft 2 of the motor M is connected to the center O of the linear holding member 22, and the polishing member side gear 41 is an idle gear. Drive shaft 2 of the motor M via 42
The polishing section 1 is composed of a gear train 40 that is connected to a sun gear 43 that is concentrically provided in the middle part of the above.

Here, in order to hold the shaft member 7 by the linear holding member 22, the casing of the bearing 8 fitted in the intermediate portion of the shaft member 7 is inserted into the end portion 22 of the linear holding member 22.
a and 22b are held by appropriate means. The number of teeth of the polishing member side gear 41 and the sun gear 43 are basically the same. The shaft member 44 of the idle gear 42 extends toward the linear member 22, and a bearing 45 is attached to the tip end portion 44a thereof. And that bearing 4
The casing 5 is held by the linear holding member 22 by appropriate means.

Since the remaining structure of the polishing section 1 is the same as that of the first embodiment, its detailed description will be omitted.

Since the polishing tool according to the third embodiment is constructed as described above, when the linear holding member 22 and the sun gear 43 are rotated by the motor M, the polishing member 6 is moved in the same manner as in the first embodiment. Perform an orbital movement. In this case, unlike the first embodiment, since the movement of the polishing member 6 is restricted by both the linear holding member 3 and the gear train 40, the rotation of the polishing member 6 is reliably restricted and the revolving motion is made clearer. It That is, the sun gear 43 and the idle gear 4
The gear train 40 composed of the gears 2, 42 and the polishing member side gears 41, 41 constitutes the rotation restricting means.

Next, the polishing by the polishing tool thus constructed will be described.

Step 1: The motor M is driven to orbit the polishing member 6.

Step 2: The polishing surface of the polishing member 6 in orbital motion is pressed against the coated surface on which the water film is formed.

Step 3: The entire coated surface is polished while moving the polishing tool appropriately.

In this way, the coated surface is polished, but since the polishing is performed using an even number of polishing members 6 arranged so that the centrifugal force is balanced on the coated surface, it does not occur by accident. Good vibration can be achieved without vibration due to balancing.

The present invention has been described above based on the embodiments, but the present invention is not limited to the embodiments and various modifications can be made. For example, although the gear train is used as the rotation restricting means in the third embodiment, it may be replaced with a timing belt.

[0044]

As described above, according to the present invention,
Since there is no accidental unbalance, vibration due to it does not occur. Therefore, the orbital radius can be significantly increased. Therefore, deterioration of polishing quality due to vibration does not occur. Moreover, since the orbital radius is large, the speed of the polishing surface can be increased. As a result, the polishing quality is remarkably improved.

Further, since the orbital radius is remarkably large, the speed of the polishing surface can be increased more than before even at a lower rotation speed than ever before. Therefore, it is possible to prolong the service life of the parts used for the rotating part. Therefore, it is possible to reduce the frequency of replacement of parts of the rotating unit.

Further, since the polishing is performed using the even number of polishing members, the consumption amount of the polishing element per time is halved. Therefore, the life of the polishing element is extended and the frequency of replacement of the polishing element is reduced.

[Brief description of drawings]

FIG. 1 is a schematic view of a polishing section of Example 1 of a polishing tool of the present invention.

FIG. 2 is a plan view of the same.

FIG. 3 is an explanatory diagram of rotational movement of the polishing member of Example 1.

FIG. 4 is a plan view of a polishing section of Example 2 of the polishing tool of the invention.

FIG. 5 is a schematic view of a polishing section of Example 3 of the polishing tool of the invention.

FIG. 6 is a schematic view of a polishing section of a conventional polishing tool.

FIG. 7 is a schematic view of a polishing section of another example of a conventional polishing tool.

FIG. 8 is a schematic view of a polishing section of still another example of a conventional polishing tool.

9 is an explanatory diagram of an even / unbalance in the conventional example shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Polishing part 2 Drive shaft 4 Pad 5 Polishing element 6 Polishing member 7 Shaft member 8 Ball bearing 20,22 Linear holding member 30 Cross-shaped holding member 40 Gear train 41 Polishing member side gear 42 Idle gear 43 Sun gear M Motor r Orbital radius

Claims (8)

[Claims] 1. A polishing method using an even number of polishing members, wherein the even number of polishing members are arranged so that centrifugal forces with respect to a reference point are balanced, and then the polishing members are revolved around the same point. A polishing method comprising: 2. The polishing method according to claim 1, wherein two polishing members are used, they are linearly arranged, and a midpoint between them is used as a reference point. 3. The polishing method according to claim 1, wherein four polishing members are used, they are arranged in a cross shape, and the intersections of the crosses thereof are used as reference points. 4. An even number of polishing members, a holding member, and a driving means are provided, and the polishing member is provided with a shaft member on the surface opposite to the polishing surface, and the polishing member has the holding member. A polishing tool, wherein the member is rotatably held in a positional relationship in which a centrifugal force with respect to a reference point is balanced, and the holding member has a polishing section which is rotatable about the reference point by a driving means. 5. Two polishing members are used, the shaft members of which are rotatably held at both ends of a linear holding member, and the holding member is rotatable by a driving means about its midpoint. The polishing tool according to claim 4, wherein 6. Four polishing members are used, the shaft members of which are rotatably held at the respective tip portions of the cross-shaped holding member, and the holding members are driven by driving means so as to intersect the intersections of the cross-shaped holding members. The polishing tool according to claim 4, wherein the polishing tool is rotatable around the center. 7. The polishing tool according to claim 4, wherein rotation regulating means is added, and the rotation of the polishing member is regulated by the rotation regulating means. 8. The polishing member-side gear, wherein the rotation restricting means has the same number of teeth as the sun gear having the same rotation center as the rotation center of the holding member and the sun gear mounted on the shaft member of the polishing member. The polishing tool according to claim 7, which is a gear train including an idle gear provided between the sun gear and the gear on the polishing member side.