JP3264982B2 - Wet buffing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to
The present invention relates to a wet buffing method for polishing a surface of a workpiece by bringing a rotating buff into contact with a polishing liquid containing abrasive grains.

[0002]

2. Description of the Related Art In this type of wet buffing method,
The supply of the abrasive grains to the buff is carried out together with the polishing liquid in addition to the polishing liquid.

[0003] Since the polishing action by the buff is performed in the contact area between the buff and the workpiece, the polishing liquid containing abrasive grains is moved by various means to reach the central portion in the contact area. Supply is taking place.

Incidentally, the abrasive particles supplied to the contact area in this way are worn out by the polishing action, and therefore must be appropriately discharged from the contact area for the efficiency of the polishing action and the like. If a large amount of worn abrasive grains are left in the contact area, metal powder or the like by polishing may adhere to the abrasive grains, thereby damaging the surface of the workpiece or causing uneven finish.

[0005] Therefore, conventionally, in this type of wet buffing method, buffing is appropriately performed to prevent deterioration of the surface of the workpiece.

[0006]

According to such a conventional technique, the work is troublesome, and especially when the surface of the workpiece is made to have a good finished surface, the work is frequently performed. The efficiency of wet buffing decreases.

The present invention has been made in view of the above circumstances, and reduces the frequency of troublesome buff replacement so that wet buffing can be performed even when the surface of the workpiece has a good finished surface. It is intended to be able to perform efficiently.

[0008]

In order to achieve this object, an invention according to claim 1 comprises a buff attached to a rotating shaft while supplying a polishing liquid containing abrasive grains to a surface of a workpiece. by contacting, in the wet buffing method of polishing a surface of the workpiece, during the polishing process of the workpiece by the buff is moved in so that is spaced between the buff and the surface of the workpiece, Thereafter, the buff is brought close to the surface of the workpiece, and brought into contact with the same pressing force as before, while the supply of the polishing liquid is continued , and the workpiece is removed.
Fixed to a rotary table that enables forward and reverse rotation drive
Then, with the reversal of the rotation driving direction of the rotary table,
The movement of the buff with respect to the surface of the workpiece is performed.

[0009]

According to the first aspect of the present invention, the polishing liquid is placed between the buff and the workpiece in a state where the buff presses the workpiece against the workpiece by the movement of the buff relative to the surface of the workpiece. Is supplied, the restraint of the worn abrasive grains, metal powder, etc., which has been held between the buff and the workpiece, is loosened, and the removal by the polishing liquid is promoted.

[0010] Therefore, worn abrasive grains and the like existing between the buff and the workpiece are reduced, and the possibility of scratching the surface of the workpiece and causing uneven finish is reduced.

Therefore, the frequency of troublesome buff replacement can be reduced, and the wet buffing can be efficiently performed even when the surface of the workpiece has a good finished surface. Also, with the reversal of the rotation drive direction of the rotary table,
To move the buff relative to the surface of the workpiece
By doing so, the above effect can be further enhanced.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to an embodiment shown in the drawings. In this embodiment, the present invention is applied to a design surface of an automobile wheel which is a cast product made of an aluminum alloy. In addition, when the wheel is mounted on a car, the design surface faces the outside of the car body,
A surface that constitutes a part of the appearance of a car.

First, an automobile wheel blank 1 as a workpiece is cast by pouring a molten metal of an aluminum alloy (for example, AC4CH) into a mold formed into a required shape.

After the wheel material 1 for an automobile thus obtained is taken out of the mold, the weirs and the like are removed, and a predetermined position is machined at a required position, so that the dimensional accuracy of the automobile wheel is reduced. It is in a secured state.

In the wheel material 1 for automobiles, a large number of irregularities are formed on the design surface 2 of the automobile wheel material 1 by a spoke portion 3, a through hole 4, a hub portion 5, a rim portion 6, etc. 2 and 3).

The design surface 2 (corresponding to the surface of the present invention) of the wheel material 1 for an automobile is subjected to a required rough finish and a medium finish, and then subjected to the following wet buffing method. The design surface 2 is formed on a good finished surface in a bright state.

That is, the wet buffing method of the embodiment is as follows.
It is as follows (see FIGS. 2 and 3).

In this wet buffing method, the wheel material 1 for an automobile is fixed on a rotary table 11 such that the center of the wheel material 1 coincides with the rotation center O of the rotary table 11 so that the design surface 2 is in an upward horizontal position. The design surface 2 is polished with a lower end surface of a buff 13 attached to a lower end portion of a rotating shaft 12 hanging down from above.

The rotary table 11 is rotated at a low speed at the time of machining, and sequentially displaces a portion to be machined by the buff 13 in a circumferential direction. The rotation direction of the turntable 11 of this embodiment is reversed at appropriate intervals (for example, every 30 seconds).

The buff 13 is formed of a material which is extremely flexible as compared with the conventional buff. In this embodiment, the foaming ratio is high (for example, 3 to 5 times), and the open-cell sponge material is used. Is formed. The buff 13 is not limited to a sponge material, and a buff made of another material may be used as long as the material is as flexible as the sponge material.

For this reason, the buff 13 is
Despite the presence of irregularities on the surface, as shown in FIG.
The lower end surface can reliably maintain the contact state on the design surface 2.

The pressing force of the buff 13 on the design surface 2 is as small as, for example, 1 kgf / cm ² or less.

The rotating shaft 12 for supporting the buff 13 at the lower end is provided with an elevating device 15 composed of a hydraulic cylinder or the like.
The rotation shaft 12 is driven at, for example, 300 rpm so that the rotation speed of the buff 13 is extremely low, such as about 10 m / sec or less. In this embodiment, the rotational speed of the buff 13 is, for example, 4 m / sec.

This is to ensure that the flexible material constituting the buff 13 can be deformed following the irregularities while maintaining the state of contact with the irregularities on the design surface 2.

The rotating direction of the rotating shaft 12 is adapted to be driven to rotate in a direction coinciding with the rotating direction of the rotary table 11, and when the rotating direction of the rotary table 11 is reversed to the opposite direction. In the meantime, the rotating shaft 12 is lifted by the elevating device 15, the buff 13 is separated upward from the design surface 2, and the rotating direction of the rotating shaft 12 is reversely driven.

Therefore, even if the rotation direction of the turntable 11 is reversed, the rotation direction of the turntable 11 and the rotation direction of the buff 13 are always maintained in the same direction.

A shaft hole 12a is formed in such a rotating shaft 12, and a polishing liquid to which abrasive grains are added is applied to the shaft hole 12a.
a to the center of the contact area between the buff 13 and the design surface 2.

In this embodiment, the polishing liquid has a particle size of 10
containing μm alumina as abrasive grains, it is the added aqueous solution of a surfactant.

In this embodiment, as shown by the imaginary line in FIG. 3, the polishing liquid nozzle 1 supplies the same polishing liquid as described above toward the contact area between the buff 13 and the design surface 2.
6 is provided to ensure the supply of fresh abrasive grains from the peripheral edge side of the contact area between the buff 13 and the design surface 2.

The polishing liquid supplied from the shaft hole 12a of the rotary shaft 12 and the polishing liquid nozzle 16 is, for example, about 100 cc / min or more.

The supply of the polishing liquid from the shaft hole 12a of the rotary shaft 12 and the polishing liquid nozzle 16 is continued even when the rotation direction of the rotary table 11 is reversed.

The rotation of the rotary table 11, the rotation of the buff 13, the movement of the rotary shaft 12, and the supply of the polishing liquid in this embodiment are as shown in the timing chart of FIG.

In FIG. 1, the horizontal axis indicates the time axis, and time t ₀ is a certain time when the turntable 11 is rotating clockwise.
Between the time t ₀ and the time t _{1 at} which the right rotation of the turntable 11 stops, the rotating shaft 12 having the buff 13
Maintains a state in which the buff 13 is pressed against the design surface 2 with a predetermined pressing force at the lowered position indicated by the solid line in FIG. 2 (indicated by “contact” in FIG. 1). The buff 13 is provided on the rotating shaft 1.
2 rotates clockwise at a predetermined rotation speed. And
During this time, the polishing liquid is applied to the shaft hole 12a of the rotary shaft 12.
The polishing liquid is supplied through a polishing liquid nozzle 16 toward a contact area between the lower end of the buff 13 and the design surface 2.

Therefore, between the time t ₀ and the time t ₁ , the polishing action is performed by the abrasive grains contained in the polishing liquid in the contact area between the buff 13 and the design surface 2.

At time t ₁ , the rotation table ₁ and the buff 13 are rotated to reverse the rotation direction.
1 and the buff 13 stop rotating. At the same time, the elevating device 15 pulls up and drives the rotating shaft 12 to separate the lower end surface of the buff 13 from the design surface 2 (the raised position indicated by the imaginary line in FIG. 2; ").) Also in this state, the supply of the polishing liquid is performed in the same manner as described above.

Therefore, the polishing liquid is supplied to the portion that was the contact region in a state where the buff 13 is separated from the design surface 2 as described above, so that the polishing liquid was confined in the contact region until time t ₁ . The worn abrasive grains and metal powder are washed away with the polishing liquid.

[0037] Incidentally, this state is short from time t ₁ to time _2, for example, about 5 seconds.

At time t ₂ , the rotary table 1
1 starts rotating counterclockwise, and the rotating shaft 12 is lowered by the elevating device 15 so that the buff 13 is pressed against the design surface 2 with a predetermined pressing force at the lowered position as described above. Start left rotation. Supply of polishing liquid
It is the same as above, polishing action in the case of clockwise rotation as well as the contact region in the period from the time t ₂ to time t ₃ is performed.

At this time, since the abraded abrasive grains and the metal powder generated earlier during the time t ₁ to the time t ₂ have been removed,
New abrasive grains are easily dispersed in the contact area, and a good polishing action is performed.

The time from time t ₂ to time t ₃ is, for example, about 30 seconds, and the same applies to the time of the right rotation operation of the turntable 11 and the like.

At time t ₃ , the rotation of the turntable 11 and the buff 13 is stopped to reverse the rotation direction to the right.

The rotating shaft 1 is moved by the elevating device 15.
2, the lower end surface of the buff 13 and the design surface 2 are separated from each other, and the supply of the polishing liquid is continued as in the case from the time t ₁ to the time t ₂ .

Therefore, the worn abrasive grains and metal powder that have been confined in the contact area until time t ₃ are washed away with the polishing liquid, and the rotating table 11 and the buff 13 are removed from time t _4.
Starts right rotation, function similarly to the time t ₁ that the until time t _2.

As described above, the rotary table 11 and the buff 1
By repeating the rotation, stop and reversal of 3 over an appropriate period of time, the polishing of the design surface 2 as a finished surface in a bright state is completed.

In this embodiment, the rotary table 11
With the reversal of the rotation direction of the buff 13 and the buff 13, the buff 13 is pulled up so as to be separated from the design surface 2, and the polishing liquid is supplied in that state to the portion on the design surface 2 that has been in contact with the buff 13 in advance, so There is an advantage that foreign substances such as worn abrasive grains sandwiched between the buff 13 and the design surface 2 during operation can be reliably removed.

As a result, the time during which the buff 13 can be used continuously becomes long, and it is not necessary to frequently replace the buff 13 as in the prior art. Can be performed efficiently.

In the above-described embodiment, worn abrasive grains and the like are eliminated by using the opportunity of reversing the rotary table 11 or the like. However, the present invention is not limited to this. For example, as shown in FIG. Is also good.

FIG. 4 shows the timing chart shown in FIG. 1 in which opportunities P ₁ and P ₂ for eliminating worn abrasive grains and the like are additionally set. In the following, only this point will be described. .

As can be seen from FIG. 4, the occasions P ₁ and P ₂ for eliminating the worn abrasive grains are determined at the time t _1.
From up to time t _2, the or than provided from time t ₃ to time t _4, the height of the lifting operation of the rotary shaft 12 is small and also that time is of a short time.

That is, these opportunities P ₁ and P ₂ correspond to FIG.
As is clear from FIG.
By slightly raising and lowering the rotary shaft 12 in a short time during the left rotation operation, the buff 13 moves so as to enlarge the space between the buff 13 and the design surface 2. The pressing force by the buff 13 is weakened without being separated.

In this way, the buff 13 and the design surface 2
Since the restraint of the worn abrasive grains and the like sandwiched in between is weakened, the outflow of the worn abrasive grains and the like to the outside of the contact region by the subsequent polishing liquid and the supply of new abrasive grains can be promoted to some extent, Since the time during which the buff 13 can be used continuously can be prolonged, the polishing operation can be efficiently performed when the buff replacement is reduced and a good finished surface is obtained by the wet buffing method.

Further, the time interval between the occasions P ₁ and P ₂ for removing such worn abrasive grains and supplying new abrasive grains is set to a short time of, for example, about 5 seconds, and is continuously buffed during the polishing process. 1
By performing the lifting / lowering operation of No. 3, the abrasive grains positioned between the buff 13 and the design surface 2 and performing the polishing action can be maintained in a good state.

In this case, if the operation of the buff 13 is performed so as to be separated from the design surface 2, the metabolism of the abrasive grains located between the buff 13 and the design surface 2 to new abrasive grains is performed. Is effectively performed, and the polishing process with good abrasive grains is performed reliably, so that a good finished surface can be reliably obtained by processing in a relatively short time.

In the above-described embodiment, the rotating shaft 12 is a vertical shaft. However, it can be said that the present invention can be similarly applied to the case where the rotating shaft for driving and rotating the buff has a horizontal axis. Not even.

[0055]

As described above, according to the first aspect of the present invention, the buff and the workpiece are reduced in a state where the buff pressing force on the workpiece is reduced by the movement of the buff with respect to the surface of the workpiece. Since the polishing liquid is supplied between the workpiece and the workpiece, the restraint of the worn abrasive grains and metal powders which have been held between the buff and the workpiece is loosened, and the removal by the polishing liquid is promoted. You.

Therefore, worn abrasive grains and the like existing between the buff and the workpiece are reduced, and the possibility of scratching the surface of the workpiece and causing uneven finish is reduced.

Therefore, the frequency of troublesome buff replacement can be reduced, and the wet buffing can be efficiently performed even when the surface of the workpiece has a good finished surface. Also, with the reversal of the rotation drive direction of the rotary table,
To move the buff relative to the surface of the workpiece
By doing so, the above effect can be further enhanced.

[Brief description of the drawings]

FIG. 1 is a timing chart of a wet buffing method according to an embodiment.

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

FIG. 3 is a top view for explaining a wet buffing method.

FIG. 4 is a timing chart of a modified example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Automobile wheel material (workpiece) 2 Design surface (surface) 11 Rotary table 12 Rotary axis 13 Buff 15 Lifting device

Continuation of the front page (56) References JP-A-4-93168 (JP, A) JP-A-4-336954 (JP, A) JP-A-50-104491 (JP, A) JP-A-3-234460 (JP) , A) JP-A-2-15970 (JP, A) JP-A-50-21194 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B24B 29/00 B24B 57/02 B24B 37/00

Claims (3)

(57) [Claims] 1. A wet buffing method for polishing a surface of a workpiece by supplying a polishing liquid containing abrasive grains to the surface of the workpiece and bringing the polishing liquid into contact with a buff attached to a rotating shaft. during the polishing process of a workpiece according, to move to so that is spaced between the buff and the surface of the workpiece, after this, is brought closer to the said buff the surface of the workpiece, as in the previous And the supply of the polishing liquid is continued during this time , and the workpiece can be driven to rotate in the forward and reverse directions.
Fixed to the rotating table
As the direction is reversed, before the buff to the surface of the workpiece
A wet buffing method characterized by performing the movement . 2. The wet buffing method according to claim 1 , wherein the rotation driving direction of the rotary table is reversed.
A wet buffing method, wherein the rotation direction of the rotating shaft is also reversed, and the rotating direction of the rotary table and the rotating direction of the rotating shaft are maintained in the same direction. 3. While supplying a polishing liquid containing abrasive grains to the surface of a workpiece, it is brought into contact with a buff attached to a rotating shaft,
In wet buffing method of polishing a surface of the workpiece, during the polishing process of the workpiece by the buff is moved in so that is spaced between the buff and the surface of the workpiece, after this, the The buff is brought close to the surface of the workpiece and brought into contact with the same pressing force as before, while the supply of the polishing liquid is continued during this time , and with the separation of the buff from the surface of the workpiece,
A wet buffing method characterized by reversing the rotation direction of the rotating shaft .