JP2740645B2 - Polishing method of aluminum wheel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of polishing an aluminum wheel mainly for pretreatment such as plating and painting.

[0002]

2. Description of the Related Art For example, an aluminum wheel used for an automobile has a main shape formed by a casting method, a casting burr is removed using a deburring tool such as a hand grinder, and a cutting tool such as a lathe or drilling machine. A first step of preparing a finer shape, a second step of removing burrs generated by grinding by shot blasting or buffing, chamfering corners and improving surface roughness, and plating. Alternatively, it is manufactured by a third step of forming a protective film while improving the aesthetic appearance by painting.

[0003] The shot blast method has been generally used as the second step of the above three steps.
The shot blast method is, for example, by suspending the aluminum wheel after the first stage of the process on a hanger, loading the aluminum wheel into a projection chamber, and projecting a projectile accelerated by a high-speed rotating impeller over the entire surface. This is a method of processing the surface substantially uniformly by scraping or burying the surface texture.

However, in the shot blast method, sharp edges and cutting burrs tend to remain, and when applied to cast aluminum wheels having a large surface roughness of about 100S, a work surface of at most about 50S can be obtained. It is said that a high-quality coating film can be obtained by one coating when the third step is a coating step.
It was difficult to obtain S. However, in recent years, there has been a demand for a high-grade painted surface that can provide a result of a 20S-class underlayer due to the trend toward high-grade products, and it is also required to reduce rusting due to peeling of a coating film, which frequently occurs on sharp edges. After the shot blasting process, burrs and the like are manually processed, and then, in the third step, countermeasures such as applying an acrylic coating four times are taken.

In the case where plating is used as the third step, a further improvement in surface roughness is required. Therefore, the buff polishing method is used in the second step, but the buff polishing method is used. Then, for example, it takes time and effort for the skilled worker to finish all by hand while reducing the roughness in four stages using a manual tool. In any case, the production cost rises and the skilled worker runs short and production catches up There was no problem.

[0006] As another polishing method, there is a barrel polishing method which has been used for a long time as a mechanizing means of surface polishing along with the shot blast method. In the barrel polishing method, a corner portion from a convex portion such as a burr is flattened. Polishing more powerfully,
In addition, it has features such as less occurrence of undulation, and is expected to solve the problems of the above shot blast method.However, it has the following problems and has been used practically as a grinding method for aluminum wheels. Absent.

That is, there are four types of barrel polishing methods, namely, centrifugal force, flow type, vibration type, and rotary type, depending on the form of the kinetic force applied to the polishing tank to generate the polishing force. In both the fluid type and the rotary type, the media moves a lot and as a result, the media rubs against the work and generates an abrasive force.When using an aluminum wheel with a deep concave shape for polishing, the media in the concave portion is constrained, and that part is restricted. It cannot be adopted due to a fundamental problem that is not sufficiently polished.

On the other hand, in the vibration type, the above-mentioned problem is reduced because the polishing force is generated even by the fine vibration of the medium. However, if the large flow as a whole is prevented, the polishing force is significantly reduced. In the conventional single-axis type vibration barrel polishing device, small eddies that change the direction partially occur at the same time, so that the aluminum wheel moves irregularly under the influence of the eddies, causing uneven polishing. Can occur,
There is a problem that the so-called "lifting phenomenon" in which the medium is moved upward and separates from the medium is likely to occur, and it is difficult to continue the polishing stably.

[0009]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems and solves the above-mentioned second problem which is carried out as a pre-treatment of a plating process or a painting process in the manufacturing process of an aluminum wheel. An object of the present invention is to provide a method for polishing an aluminum wheel that can satisfy the required accuracy stably, at low cost, without requiring a skilled worker in the polishing process at the stage.

[0010]

A method for polishing an aluminum wheel according to the present invention, which has solved the above-mentioned problems, comprises a polishing tank having a U-shaped cross section in which a medium and a polishing liquid are charged, while maintaining its posture. The medium is caused to flow in a polishing tank by applying a vibration force that moves the center of gravity in a substantially circular shape at high speed, and an aluminum wheel to be polished along the flowing direction of the medium is inserted into the polishing tank and the medium is polished. The feature is that barrel grinding is performed while rotating the aluminum wheel by the flow force of the aluminum wheel.

In the above-mentioned barrel polishing method, a polishing liquid having a function of dissolving aluminum is employed as the polishing liquid, and the polishing liquid in the polishing tank is discharged at a predetermined speed, and a reaction corresponding to the discharge is performed. It is preferable to reduce the polishing time by supplying a highly abrasive polishing liquid while maintaining the reactivity of the polishing liquid. Further, as the above-mentioned reactive polishing liquid, at least 0.1% of caustic soda is used. It is preferable to contain 5% by weight to 2% by weight and at most 5% by weight of an organic acid salt composed of one or more organic acids of gluconic acid, citric acid and tartaric acid and an alkali metal.

Next, a preferred embodiment of the present invention will be described with reference to a polishing apparatus shown in the drawings. FIG. 1, FIG. 2 and FIG. 3 show a two-axis vibrating barrel polishing apparatus, in which five 150-liter polishing spaces 1 are connected to each other, and a polishing tank 2 having a U-shaped cross section and a tank width of 470 mm is provided. The four corners are fixed to the machine frame 22 by a spring member 4 so as to be movable within its elastic deformation range, and a pair of four counterweights 3 are fixed to the left and right so that their shafts can rotate. Since the left and right counterweights 3 have their shafts connected by a toothed pulley 5 and a timing belt 6, when the rotational force of a driving motor 8 via a coupler 7 is applied to one of the rotary shafts, the counterweights 3 are in phase with each other. It rotates at the rotation speed. A polishing liquid tank 16 provided with a stirrer 17 and a pump 18 is provided at the rear, and the polishing liquid C is always stored in a predetermined range. The pump 18 is connected to the tank 16
The polishing liquid C in the inside is drawn out, branched into five via a valve 19, and supplied to each polishing space at a predetermined speed via an individual setting valve 21 provided for each polishing space. Further, a discharge port 9 for discharging the medium M and the polishing liquid C is provided at the bottom of each polishing space 1, and the discharge port 9 is usually closed by a cover 10 which can be opened and closed, and is discharged during polishing. The polishing liquid is collected in a drain pipe 13 via a valve 11 from a polishing liquid discharge port provided in a lid thereof, and is guided to a waste water treatment device by a hose 15 via an electromagnetic valve 14. In this embodiment, the polishing tank 2 is composed of a large number of polishing spaces 1 so that a large number of aluminum wheels can be processed at the same time. Of course, it is not limited to.

As an operation procedure of such an apparatus, first, an upper door (not shown) is opened and a predetermined amount of, for example, 100 liters of a medium and 3 liters of a polishing liquid are charged into each polishing space 1 of the polishing tank 2. I do. As the medium, plastic P1-F20 (for heavy cutting) or ceramic VX-E20 (for medium cutting) is used. After loading the media and the polishing liquid in this manner, the drive motor is started to oscillate the polishing tank 2 with an amplitude of about 4.5 mm to start the flow of the media, and the aluminum wheel is placed in each polishing space 1. As W, for example, one low pressure cast aluminum wheel having an outer diameter of 380 mm and a width of 200 mm is sunk into the medium by about 30% while slightly tilting the axis thereof in a direction substantially parallel to the longitudinal axis of the polishing tank 2. At this time, the aluminum wheel W automatically moves to the stable position due to the "pull-in phenomenon", so that there is no need to push the aluminum wheel W using the auxiliary means. As the above-mentioned polishing liquid, for example, in the case of a non-reactive polishing liquid, a compound GLC (non-reactive) which is generally used is diluted 100 times with water and used.
In the case of a reactive polishing liquid, the alkaline compound FL-115 may be used after diluting it 100 times or 50 times, and the polishing liquid obtained by diluting the FL-115 100 times may be used in the following No. 32. It is the same as the polishing liquid shown in the example.

After the loading of the aluminum wheel W is completed in this manner, the door is closed, and when a reactive polishing liquid is used, the switches are operated to operate the electromagnetic valve 14 and the electromagnetic valve 14 for discharging the polishing liquid. The pump 18 is operated to start the replacement of the polishing liquid at a predetermined speed. Then, after polishing for a predetermined time, each operation is stopped, the door is opened, only the aluminum wheel W is taken out from each polishing space 1, and the next aluminum wheel W to be polished is similarly charged, and polishing is continued. be able to. In addition, when taking out the aluminum wheel W, it is possible to take out the aluminum wheel W with a small force by continuously applying vibration at a low vibration speed. In addition, the media may be appropriately added in a shortage according to the decrease due to the abrasion. When replacing the media, open the lid 10 and use the bottom discharge port 9 or the discharge port on one side of a polishing tank (not shown). The medium inside may be discharged and another predetermined medium may be inserted.

Next, the operation of each component of the present invention will be described. As described above, the present invention provides a polishing tank having a U-shaped cross section, in which a medium and a polishing liquid are charged, by applying a vibration force that moves the center of gravity of the polishing tank into a substantially circular shape at a high speed while maintaining its posture. It is characterized in that the above-mentioned medium is caused to flow, an aluminum wheel to be polished is mounted along the flow direction of the medium, and barrel polishing is performed while rotating the aluminum wheel in the polishing tank by the flow force of the medium. But,
Here, the reason that the loading direction of the aluminum wheel is set to follow the flow direction of the media is that if the loading is performed in another direction,
As a result of the flow motion of the medium being partially interrupted and causing an uneven vortex, the polishing force is reduced as a whole, causing uneven polishing, and the aluminum wheel cannot be stably present in the mass, for example, This is because a polishing phenomenon occurs and polishing cannot be continued.

Further, the reason that the polishing tank is given a vibration force for moving its center of gravity in a substantially circular shape at a high speed while maintaining its position is, for example, a commonly used one-axis vibration. When a barrel polishing machine is used, a phenomenon in which the polishing tank tilts left and right around the center of gravity together with the movement of the center of gravity, a so-called "swinging phenomenon" occurs. On the other hand, when the aluminum wheel is inserted along the flow direction of the entire medium, the above-mentioned problems are likely to occur.

In the polishing method of the present invention, when a reactive polishing liquid is used as described above, the reactive polishing liquid exerts a chemical polishing action in addition to a lubricating action, a cooling action and the like. And the polishing speed is remarkably improved by the synergistic effect with the physical polishing action by the media.
The chemical polishing action preferentially dissolves small projections such as corners, burrs, and abrasive flaws, so that a polishing action suitable for an aluminum wheel can be obtained. In addition, by supplying the same type of polishing liquid that is more reactive than the polishing liquid in the polishing tank while discharging the reactive polishing liquid at a predetermined rate, the reactivity of the polishing liquid in the polishing tank is kept constant. It is possible to keep the reduction of the polishing force due to the progress of the polishing so as to be negligible, and it is also possible to repeat the polishing by replacing only the workpiece.

Furthermore, in the polishing method of the present invention, if an alkaline reactive polishing liquid is employed as the reactive polishing liquid, the aluminum wheel can be dissolved, but a polishing apparatus mainly composed of an iron-based metal is used. Suitable without corrosion, in which case the chemical polishing action results from the inclusion of at least 0.5% by weight of caustic soda and the polishing power increases in proportion to its content, but if it exceeds 2% by weight Is not suitable for grinding aluminum wheels due to the rough surface roughness. Further, an increase in the content of the organic acid salt improves the polishing power, but the polishing power is maximized at about 1% by weight, and when the organic acid salt is further increased, the polishing power tends to decrease gradually. It may be 5% by weight, preferably 3% by weight, more preferably 2% by weight. The minimum content of 0.1% by weight at which a remarkable effect is recognized is sufficient. In the compound, a surfactant, a viscosity modifier and the like can be appropriately used in addition to the above-mentioned materials. Usually, the polishing process is carried out while maintaining the temperature in the polishing tank at normal temperature.However, when the temperature rises, the chemical polishing action is accelerated more than the mechanical polishing action. It is better to take.

In the above-described polishing method of the present invention, when an aluminum wheel is inserted along the direction of flow of the medium flowing in the polishing tank having a U-shaped cross section, the polishing tank is kept in that position. The vibrating force that moves the center of gravity in a substantially circular shape at high speed is given, so if about 1/3 of the aluminum wheel is submerged in the media,
The aluminum wheel automatically moves to a stable position near the bottom of the polishing tank and is located. A so-called "pull-in phenomenon" occurs, so the media in the polishing tank is once discharged and reloaded, or a special push-in jig is used. There is no need to provide, for example. Also, the aluminum wheel that has reached a stable position in the polishing tank in this way rotates at that position due to the fluid force of the media,
Aluminum wheels are originally formed in a shape that facilitates smooth rotation, so they do not hinder the flow of media, and each grinding part moves at high speed,
A strong polishing force can be generated in a polishing tank having a minimum necessary size.

Further, in the above-mentioned polishing method, if the reactive polishing liquid is used while maintaining the reactivity of the polishing liquid in the polishing tank, the polishing is performed by the synergistic effect of the chemical polishing action and the physical polishing action. It is possible to greatly reduce the time, and it is possible to greatly improve the work efficiency of the production process in combination with the semi-automatic carry-in effect.In the polishing method, at least caustic soda is used as a reactive polishing liquid. An alkaline polishing liquid containing 0.5% to 2% by weight and containing at most 5% by weight of an organic acid salt composed of one or more organic acids of gluconic acid, citric acid and tartaric acid and an alkali metal. By using, it is possible to dramatically improve the polishing force without corroding the apparatus and suppressing the great deterioration of the surface roughness.

[0021]

Next, the present invention will be described in detail with reference to examples. Example 1 In Example 1, the effect of the movement form of the polishing tank and the charging direction of the aluminum wheel on the continuation of stable polishing was examined, and the results of the tests are shown in Table 1.

[Table 1]

The loading of the aluminum wheel along the flow direction of the media into the polishing tank can be embodied by loading the aluminum wheel such that the original rotation axis of the aluminum wheel is parallel to the vibration axis of the polishing tank. The method is tentatively referred to as “vertical direction”, and the other methods are referred to as “horizontal direction” for distinction. Also, in the polishing tank,
A method of applying a vibration force that moves the center of gravity in a substantially circular shape at a high speed while maintaining its posture is based on the center of gravity of the polishing tank regardless of the number of counterweights that generate the vibration force and the number of rotation axes. They can be embodied by arranging them in point symmetry. For example, the relationship between the counterweight 3 and the polishing tank 2 is appropriately selected by selecting a form such as a, b, c, d, and e in FIG. It can be used as a combination, and whatever form is adopted, it is sufficient to balance the value of the physical quantity obtained by multiplying the distance from each rotation axis to the center of gravity and the amount of unbalance. When is rotated in the counterclockwise direction, a substantially circular flow in the counterclockwise direction is generated in the mass m, and the aluminum wheel w is stably positioned slightly to the lower left of the center of gravity o, and is polished well while rotating. It will be.

FIG. 5 schematically shows the mass flow state and the oscillating phenomenon in a conventional vibration barrel polishing apparatus. In the first embodiment, the embodiment of FIG. 4A is adopted as an apparatus embodying the present invention, and this is referred to as a “biaxial type”.
The configuration of FIG. 5e is adopted and this is temporarily referred to as a “center type”, and the configuration of FIG. 5 is employed as a comparative example and is referred to as a “single-axis type”.

According to the results shown in Table 1, if a biaxial or center type device is adopted and the vertical loading method is adopted, the pull-in phenomenon can be satisfactorily generated and the floating phenomenon does not occur. It can be understood that the polishing can be continued satisfactorily. In addition, even if a two-axis type apparatus is adopted, the floating phenomenon is remarkable in the horizontal charging method, and also in the case of employing a single-axis polishing apparatus as the vertical charging method, the floating phenomenon also occurs. And the pull-in phenomenon could not be caused.

Further, the method of the present invention can employ a relatively small polishing tank whose width is less than twice the diameter of the aluminum wheel relative to the diameter of the aluminum wheel. If the ratio of diameter dimensions is defined as a margin ratio, it was confirmed that a small polishing tank with a margin ratio of 1.07 can be used. However, since the grinding force increases as the rotation speed of the aluminum wheel increases, the margin ratio is preferably 1.15, and more preferably 1.24, when comparing the rotation speeds.

The conditions for polishing the aluminum wheel in Example 1 were as follows. Model: 2-axis vibrating barrel grinder, polishing tank capacity: 175 liters, polishing tank width: 470 mm, amplitude: 4 mm, media load: 110 liters, polishing liquid load: 4 liters, aluminum wheel outer diameter: 380 mm (margin) Ratio 1.25), 4
10 mm (margin ratio 1.15) 440 mm (margin ratio 1.0
7mm), aluminum wheel width: 230mm. The media used was P1-F20 (for heavy cutting) made of plastic, and the polishing liquid used was a commonly used compound GLC (non-reactive) diluted 100 times with water. In addition, the center type and the one-axis type are experimental machines created for this test using the polishing tank of the above-described two-axis type vibration barrel polishing machine, and other conditions are the same so that they can be compared under the same conditions. The test was performed.

Example 2 In Example 2, the effect of using a reactive polishing liquid and maintaining the reactivity of the polishing liquid in the polishing tank on polishing accuracy and polishing rate was examined, and the test results were shown. It is shown in FIG.

[Table 2]

According to the results shown in Table 2, it is understood that the use of a reactive polishing liquid as the polishing liquid can significantly improve the polishing rate. For example, comparing the weight reduction ratio of the work by polishing for 30 minutes as the polishing speed,
When the non-reactive polishing liquid is used (No14), the polishing rate is 0.22%, whereas when the alkaline polishing liquid is used (No11), the polishing rate is 1.18%, which is more than five times as high. In the case where an acidic polishing liquid is used (No. 13), it can be reduced to less than three times, like 0.59%. Also,
A method in which an amount of the polishing liquid corresponding to 3% of the amount of the polishing liquid loaded in the polishing tank per minute is discharged from the polishing tank, and at the same time, the same amount of the same polishing liquid as the initially charged one is supplied to perform polishing (" In the "small amount replacement type", the polishing speed and surface accuracy do not change for 30 minutes (No. 11) and 30 minutes (No. 12) from the start of polishing, but the polishing liquid is neither discharged nor supplied during polishing ("Fixed"). Expression)) is 3 times from the start of polishing.
In 0 minutes (No15) and the following 30 minutes (No16),
The polishing rate is reduced by a factor of 3, but there is no significant improvement in surface roughness. At this time, comparing the respective hydrogen ion concentrations (pH), it can be seen that there is no change in the small amount replacement type and the reactivity of the polishing liquid is maintained, but in the fixed type, the polishing solution decreases as the polishing proceeds and decreases. It is possible to know that the reactivity of the liquid has changed.

Next, the total amount of the compound increases as a result of the small-amount replacement type. For example, when polishing is performed for 30 minutes, the small-amount replacement type (No. 11) is used, and the total addition amount of the compound in that case is 1.9. %, The fixed type has a surface roughness of 7.2 μm.
(Rmax) is significantly worse. Similarly, in the case of polishing for one hour, the fixed type (No18) for the small amount replacement type (No12) is much worse with a surface roughness of 8.0 μm (Rmax). It can be understood that a good synergistic effect between the chemical polishing action and the physical polishing action as seen in the small amount replacement type cannot be expected.

The vibration barrel polishing conditions in Example 2 were as follows:
It was as follows. Model: 1-axis vibrating barrel polisher, polishing tank capacity: 8 liters, polishing speed: 30 Hz, amplitude: 4 mm, loading amount of polishing liquid:
0.3 liter. Media is plastic P1-F20 (for heavy cutting)
The non-reactive polishing liquid is prepared by adding a predetermined amount of a compound of a commonly used type (trade name: GLC) and the alkaline polishing liquid is prepared by adding a predetermined amount of an alkaline compound (trade name: FL-115) to water. The acidic polishing liquid was prepared by adding hydrochloric acid, aqueous hydrogen peroxide and sulfuric acid to 1% water, respectively. The work is 25mm × 25
An aluminum angle member of mm × 50 mm was used as a test piece.

Example 3 In Example 3, the effect of caustic soda as a component as an alkaline polishing liquid was examined and the test results are shown in Table 3. In addition, the effect of an organic acid salt was examined and the test was conducted. The results are shown in Table 4.

[Table 3]

[0032]

[Table 4]

According to the results shown in Table 3, it is understood that the polishing liquid suitably contains caustic soda in an amount of 0.5% by weight to 2% by weight. Caustic soda, potassium hydroxide, sodium silicate, and the like can be used as the hydroxide of the alkali metal. In the case of caustic soda (No. 22), Rmax is the same as that of the other cases (Nos. 27 and 28), and the amount of polishing is most preferable. Next, according to the results shown in Table 4, in order to improve the polishing effect, it is preferable that the polishing liquid contains 5% by weight or less of an organic acid salt. Further, as an organic acid salt, an organic acid salt composed of one or more organic acids of gluconic acid, citric acid and tartaric acid and an alkali metal, for example, appropriately selected from sodium gluconate, sodium citrate and potassium tartaric acid, is used. You can see that it can be done. Here, an increase in the content of the organic acid salt has a large effect of improving the polishing efficiency while maintaining the surface roughness, but as shown in Example No. 30, the maximum effect is obtained at about 1% by weight. Even if it is increased above (No. 31-33), the polishing efficiency tends to decrease gradually.
%, Preferably 3%, more preferably 2% by weight. In addition, the minimum content is determined in the Examples
0.1% by weight at which a remarkable effect is recognized as in No. 9 is sufficient.

The vibration barrel polishing conditions in Example 3 were as follows:
It was as follows. Model: 1-axis vibrating barrel polisher, polishing tank capacity: 8 liters, polishing speed: 30 Hz, amplitude: 4 mm, loading amount of polishing liquid:
0.3 liter, polishing time: 60 minutes. The medium used was plastic P1-F20 (for heavy cutting), and the work was a small cast aluminum cylinder (2
0φ15H) was used as a test piece.

Example 4 In Example 4, Table 5 shows an example of polishing an aluminum wheel suitably embodying the method of the present invention.

[Table 5]

According to the results shown in Table 5, the polishing efficiency can be improved by using a polishing liquid that is reactive with the polishing liquid. In this case, the compound concentration of the polishing liquid is increased or the polishing liquid replacement speed is increased. It can be seen that the polishing efficiency can be improved by increasing the polishing efficiency. On the other hand, if a non-reactive polishing liquid is used, the polishing accuracy can be increased. Therefore, when the polishing efficiency is more important than the precision, such as when performing the coating treatment in the third step, the reactive polishing liquid is used. The replacement speed may be set appropriately according to the economic conditions by use, or if polishing accuracy is important such as plating in the third step, a reactive polishing solution is used. Employing a two-stage polishing process in the second process using a non-reactive polishing solution in one process allows the aluminum wheel to be efficiently polished.

The conditions for polishing the aluminum wheel of this embodiment were as follows. Model: 2-axis vibrating barrel polisher, polishing tank capacity: 150 liter polishing space x 5, polishing tank width: 470 mm, amplitude: 4.
5 mm, media loading: 100 liters, polishing fluid loading: 3 liters. The aluminum wheel is a low-pressure cast product with an outer shape of 380 mm and a width of 200 mm. The media is plastic P1-F20
(Heavy cutting) or ceramic VX-E20 (for medium cutting) is used, and the non-reactive polishing liquid is prepared by diluting the commonly used compound GLC (non-reactive) 100 times with water. The reactive polishing liquid used was an alkaline compound FL-115 diluted 100-fold or 50-fold. The polishing liquid obtained by diluting FL-115 by 100 times is the same as the polishing liquid shown in the example of No32.

[0038]

As described above, the method of polishing an aluminum wheel according to the present invention uses a U-shaped cross-section polishing tank in which a medium and a polishing liquid are charged, and the center of gravity of the polishing tank is maintained at a high speed while maintaining its posture. The medium is made to flow in a polishing tank by applying a vibration force to move the medium in a substantially circular shape, and an aluminum wheel to be polished is mounted along the flowing direction of the medium, and the aluminum wheel is polished by the flowing force of the medium. Because the barrel is polished while rotating within it, the vibration barrel method is used in the aluminum wheel manufacturing process, especially in the polishing process that is performed as a pre-treatment of plating and painting, without requiring skilled workers Polishing satisfying the required accuracy can be performed stably at low cost. In particular, when a reactive polishing liquid is used, the polishing time can be significantly reduced, and the polishing is performed while maintaining the reactivity of the polishing liquid in the polishing tank, so that stable polishing can be continued. Not only is it possible, it is also possible to replace only the aluminum wheels and perform efficient polishing, and if an alkaline polishing liquid specially prepared is used as the polishing liquid, not only can the wear of the metal parts of the device be suppressed, It is possible to greatly improve the polishing efficiency while keeping the increase in surface roughness small, and to combine high-efficiency polishing with high-precision polishing to end high-precision polishing in a short time. The industrial value is extremely large.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view showing an example of an apparatus used in the method of the present invention.

FIG. 2 is a partially cutaway side view showing an example of a drive mechanism of an apparatus used in the method of the present invention.

FIG. 3 is a partially cutaway side view showing an example of a polishing tank part of the apparatus used in the method of the present invention.

FIG. 4 is an explanatory view exemplifying an arrangement relationship between a counterweight and a polishing tank in an apparatus used in the method of the present invention for all of a, b, c, d and e.

FIG. 5 is an explanatory diagram of a relationship between a mass flow state and a swing phenomenon in a conventional vibration barrel polishing apparatus.

[Description of Signs] 1 polishing space 2 polishing tank 3 counterweight W aluminum wheel M media O center of gravity

Claims (3)

(57) [Claims] The present invention provides a polishing tank having a U-shaped cross section in which a medium and a polishing liquid are charged, while applying a vibration force to move a center of gravity of the polishing tank into a substantially circular shape at a high speed while maintaining its posture. The aluminum wheel is characterized by loading an aluminum wheel to be polished into the polishing tank along the flow direction of the media and barrel-polishing while rotating the aluminum wheel by the fluid force of the media. Polishing method. 2. The polishing liquid according to claim 1, wherein the polishing liquid is a reactive polishing liquid, and the polishing liquid is discharged from the polishing tank at a predetermined speed and the polishing is performed while replenishing a polishing liquid of the same type having higher reactivity. 2. The method for polishing an aluminum wheel according to 1. 3. The method of claim 1, wherein the reactive polishing liquid comprises at least 0.5% to 2% by weight of caustic soda, gluconic acid, citric acid,
3. The method for polishing an aluminum wheel according to claim 2, wherein the method contains at most 5% by weight of an organic acid salt composed of one or more organic acids of tartaric acid and an alkali metal.