JP2009166199A - Surface processing method using fine cutting action - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a surface processing method using fine cutting action in which non-contact fine cutting action is ensured without fail by determining an index for properly and satisfactorily completing surface finish and utilizing the index. <P>SOLUTION: Surface processing using the fine cutting action of particle swarm generated from a magnetic field by non-contactly putting a magnetic field source (a permanent magnet 20) against an object 1, and continuously moving a magnetic paste 3 allowed to exist therearound. A gap g between the object 1 and the permanent magnet 20 is in the range of 0.1 to 2.0 mm. Circumferential velocity of the rotational movement of the permanent magnet 20 is calculated from the following relational expression: V [m/sec]=0.0178g+0.0637, and used as a lower limit. An upper limit of the circumferential velocity V is a maximum circumferential velocity, Vmax=0.534 m/sec, causing no sputtering of the magnetic paste 3. The surface processing is carried out so that the circumferential velocity V ranges between the lower limit and the upper limit. Thereby, the circumferential velocity V can be utilized as the index. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a surface treatment method using a fine cutting action, and more specifically, to perform a surface treatment using a fine cutting action in a non-contact manner on a mold, mock-up or film-like object. It is related to the improvement of the index so that finishing can be completed properly and satisfactorily.

  Molds, mock-ups, film-like objects, etc. require surface treatment to modify the surface properties during production, and the surface is subjected to surface treatment such as polishing, washing and cleaning. . As a surface treatment technique for finishing the surface of such an object, a so-called magnetic polishing technique is well known. This is performed by mixing a magnetic fluid (MF) or a magnetorheological fluid (MRF) with abrasive particles and moving the mixed liquid by a magnetic field.

  The polishing tool is equipped with a permanent magnet to serve as a magnetic field source. When a magnetic polishing liquid (paste material) is attached around the polishing tool, ferromagnetic particles (for example, iron particles) in MF or MRF are generated by magnetic attraction. , Many magnetite particles aggregate to form a magnetic cluster. Since this magnetic cluster is along the magnetic flux, it takes a form in which a large number of needles stand in opposition to the object. As a result, the magnetic polishing liquid adheres to the polishing bite to form a magnetic brush.

  When the magnetic brush or the object rotates, the magnetic brush moves in contact with the surface of the object due to relative movement between the two. As a result, the unevenness of the surface of the object is polished by a magnetic brush with abrasive particles, a smoother surface can be obtained, and non-contact fluid polishing can be performed.

  By the way, there are a number of condition factors to be considered in order to perform surface treatment by a non-contact and fine cutting action by the magnetic polishing method, and there is a problem that if the setting is insufficient, the surface finish cannot be obtained to the expected level. is there.

  In other words, in this case, what is the magnetic flux density of the magnetic field source, what is the gap between the object and the magnetic field source, what is the hardness of the object, the fluidity and grinding of the magnetic paste It is necessary to properly consider the level of force, etc. If the setting is incorrect, the surface finish cannot be obtained satisfactorily and defective products are produced.

  For this reason, there is a demand for an index that can properly and satisfactorily finish the surface, and an index that is easy to set and highly reliable is desired.

  The present invention solves the above-mentioned problems, and its purpose is to establish an index for properly and satisfactorily finishing the surface, and by using the index, a fine cutting action by non-contact can be achieved without failure. An object of the present invention is to provide a surface treatment method by a fine shaving action that can be obtained reliably.

In order to achieve the above-described object, the surface treatment method using a fine shaving action according to the present invention is as follows: (1) A magnetic field generation source is brought into contact with an object in a non-contact manner, and a magnetic paste existing in the vicinity is linked. And a surface treatment method for performing a surface treatment by a fine shaving action of a particle population generated by a magnetic field, wherein a gap g between the object and the magnetic field generation source is in a range of 0.1 mm to 2.0 mm, and the magnetic field generation source The peripheral speed V of the rotation operation of
V [m / sec] = 0.178 g + 0.0637
The surface treatment is performed so that the peripheral speed V is equal to or higher than the lower limit value.

  (2) The peripheral speed V is subjected to a surface treatment in which the upper limit value is set to the maximum peripheral speed Vmax = 0.534 m / sec at which the magnetic paste does not scatter, and the peripheral speed V falls within the range between the lower limit value and the upper limit value. .

  The peripheral speed V of the rotating operation of the magnetic field generation source is an important factor that determines the finishing quality of the surface treatment. In the present invention, the peripheral speed V of the magnetic field generating source has a relational expression determined with respect to the gap g with the object, and the surface treatment in which the peripheral speed V is equal to or higher than the lower limit value is set to a lower limit value. As a result, the surface can be satisfactorily finished. Therefore, the relational expression of the peripheral speed V determined with respect to the gap g can be used as an index for completing the surface finishing properly and satisfactorily.

  Further, the upper limit value of the peripheral speed V is set to the maximum peripheral speed Vmax = 0.534 m / sec at which the magnetic paste does not scatter, and the surface treatment is performed so that the peripheral speed V falls within the range between the lower limit value and the upper limit value. Can be finished without failure.

  In the surface treatment method using a fine shaving action according to the present invention, fluid polishing is performed by a magnetic cluster generated in a magnetic paste, and the relational expression of the peripheral speed V of the rotation operation of the magnetic field generation source is expressed as a gap between the object and the object. Since the surface treatment is performed in which the value determined by g and the value obtained from the relational expression is set as the lower limit value and the peripheral speed V is equal to or higher than the lower limit value, the surface can be satisfactorily finished. Therefore, the relational expression of the peripheral speed V can be used as an index for completing the surface finishing properly and satisfactorily. Further, since the surface treatment is performed so that the peripheral speed V is within the range of the lower limit value and the maximum peripheral speed Vmax = 0.534 m / sec at which the magnetic paste does not scatter, the surface finish can be reliably performed without failure.

  That is, by using the peripheral speed V as an index for completing the surface finishing properly and satisfactorily, and using the index, it is possible to reliably obtain a fine cutting action by non-contact without failure.

  FIG. 1 shows a preferred embodiment of the present invention. In the present embodiment, the configuration for performing the surface treatment by the fine shaving action includes a polishing bit 2 having a magnetic field generation source (permanent magnet 20), the polishing bit 2 faces the object 1 in a non-contact manner, and the periphery In conjunction with the magnetic polishing liquid (magnetic paste 3), the surface treatment is performed by a fine shaving action of the magnetic clusters (particle population) generated by the magnetic field.

  As the object 1, assuming a film-like object having a predetermined width with a thin film having a thickness of several tens to several hundreds of μm, such as a mold formed from a metal material, a mock-up formed from a finger material, or the like. Yes. This object 1 is placed on and supported on a support base 4. The support table 4 is configured as a moving stage that performs a moving operation in a predetermined direction.

  The polishing tool 2 is provided with a permanent magnet 20 at its tip to serve as a magnetic field generation source, and the shaft at the other end is linked to the drive means 5 and is rotated by the drive of the drive means 5. Then, in accordance with the rotation operation, the moving operation is performed in a posture facing the object 1, and the scanning operation is performed on the surface of the object 1. The polishing tool 2 is not simply rotated, but may be appropriately moved, for example, a reversing operation that repeats forward and reverse operations and a vibrating operation in the axial direction. Good.

  The magnetic field generation source is not limited to the permanent magnet 20, and for example, an electromagnet can be preferably applied as long as it applies a magnetic field to the magnetic paste 3. The generation of the magnetic field does not have to be stationary in time, and a magnetic field that varies in time may be generated.

  For example, an NC machine tool may be used as the driving means 5, and the shaft portion of the polishing tool 2 is attached to and detached from a rotating shaft (chuck portion) of a drilling machine, lathe, NC lathe, milling machine or the like. The drive means 5 has a multi-axis control function for at least the x-axis and the z-axis orthogonal to the x and y plane when the orthogonal direction along the surface of the support base 4 is the x-axis and y-axis. By starting the means 5, the polishing tool 2 is caused to perform a rotational operation and a motion operation that moves in a predetermined manner with respect to the x-axis and z-axis. Then, the moving stage support 4 is moved to the y axis. Of course, these multi-axis control motions are appropriate. For example, the movable stage (support 4) is fixed, and the drive means 5 is also moved in the y-axis so that multi-axis control of three or more axes can be performed. Also good.

A gap g between the object 1 and the magnetic field generation source 20 is in a range of 0.1 mm to 2.0 mm. The peripheral speed V of the rotating operation of the magnetic field source 20 is

V [m / sec] = 0.178 g + 0.0637 (1)

The lower limit value is calculated by the relational expression. Then, surface treatment is performed so that the peripheral speed V is equal to or higher than the lower limit value. The peripheral speed V is the speed of one point on the circumference, and with respect to the diameter d [mm] and the rotational speed N [rpm],

V [m / sec] = π × d × N / (60 × 1000) (2)

And can be calculated. In the above formula (2), π is a circumference ratio.

  In the rotating operation of the polishing tool 2, since rotating the permanent magnet 20 at the tip excessively causes a problem such as excessive polishing and conversely non-uniform finish, in order to obtain a smooth surface well, It is preferable that the peripheral speed in the rotation is within a predetermined range. In other words, the upper limit of the peripheral speed V is set to the maximum peripheral speed Vmax = 0.534 m / sec at which the magnetic paste 3 does not scatter, and the surface treatment is performed so that the peripheral speed V falls within the range between the lower limit value and the upper limit value. preferable.

  The magnetic paste 3 contains two components of magnetic particles and a solvent. Vegetable oil or the like is used as the solvent. The magnetic paste 3 is supplied by a supply means between the object 1 and the polishing tool 2.

  As the magnetic particles, soft magnetic sintered bodies such as ferrite particles, metal particles such as iron powder, and the like can be used. Ferrite particles are ceramics mainly composed of iron oxide, and most of them are ferromagnetic and have magnetization so that the particles form magnetic clusters by applying a magnetic field. The same applies to magnetizable metal particles such as iron powder. When a magnetic field is applied, the particles form magnetic clusters. Further, metal particles such as ferrite particles and iron powder, which are ceramics, are sufficiently hard for the object 1 and thus can function as abrasive grains for polishing, and the magnetic cluster itself has a fine cutting action. It becomes a magnetic brush for performing surface treatment by.

  The magnetic paste 3 may be further mixed with resin particles. In this case, the resin particles are formed from an insoluble and low melting point resin material that does not dissolve in the solvent. The shape of the resin particles can be, for example, a spherical shape or a non-spherical shape such as a fibrous shape. For example, polyethylene (PE), polystyrene (PS), polymethyl methacrylate (PMMA), polyethylene terephthalate (PET), polyvinyl chloride (PVC), and the like can be used as the resin material that does not dissolve in vegetable oils. The shape of the resin particles may be non-spherical particles such as fibers in addition to the spherical shape.

  As described above, the movement operation of the polishing tool 2 causes a predetermined movement operation such as a simple rotation operation or a reversal operation that repeats normal rotation and reverse rotation. Then, the polishing tool 2 is caused to perform a moving operation of sequentially tracing the surface of the object 1 that faces the polishing tool 2, and a normal general scanning operation is performed. At this time, the magnetic paste 3 is supplied in the vicinity of the polishing tool 2 (permanent magnet 20).

  A magnetic paste 3 exists between the polishing tool 2 and the object 1. The magnetic paste 3 includes magnetic particles such as ferrite particles and iron powder, and a magnetic cluster is generated when a permanent or variable magnetic field is applied to the magnetic paste 3 with time by the permanent magnet 20. That is, a large number of magnetic particles such as ferrite particles and iron powder in the magnetic polishing liquid are aggregated by the magnetic attractive force to form a magnetic class. Magnetic particles such as ferrite particles and iron powder function as abrasive grains for polishing, and the magnetic cluster itself becomes a magnetic brush that performs fine cutting. A large number of magnetic brushes are arranged in a needle shape in opposition to the object 1 along the magnetic flux, and ferrite particles that perform an abrasive action are suppressed on the surface of the object 1. At this time, since the polishing tool 2 performs a scanning operation, the ferrite particles move while making contact with the surface of the object 1 to perform fine cutting. Thereby, the surface treatment by a non-contact fine cutting action can be performed.

  It has been found that the peripheral speed V of the rotating operation of the magnetic field generation source (permanent magnet 20) is an important factor affecting the finishing quality of the surface treatment. In the present invention, the peripheral speed V of the permanent magnet 20 determines the relational expression (1) with respect to the gap g with the object 1, the value obtained by the relational expression (1) is set as the lower limit value, and the peripheral speed V is Since the surface treatment is performed at a value not less than the lower limit, the surface can be finished satisfactorily. Therefore, the relational expression (1) of the peripheral speed V determined with respect to the gap g can be used as an index for completing the surface finishing properly and satisfactorily.

  Further, the upper limit value of the peripheral speed V is set to the maximum peripheral speed Vmax = 0.534 m / sec at which the magnetic paste 3 does not scatter, and the surface treatment is performed so that the peripheral speed V falls within the range between the lower limit value and the upper limit value. The finish of the surface can be performed reliably without failure.

  In other words, in the present invention, the index for enabling the surface finish to be completed properly and satisfactorily is set as the peripheral speed V, and by using the index, a fine cutting action by non-contact can be reliably obtained without failure. Can do.

(Verification on a dome-shaped convex surface)
The surface treatment (polishing) of the sample was performed using the structure for fine shaving shown in FIG. The sample is made of an acrylic material, and as shown in FIG. 2, the sample is a block body provided with a dome-shaped convex portion on the upper surface.

  As for the surface treatment conditions, the polishing tool 2 was a permanent magnet 20 having a spherical neodymium magnet, an outer diameter of 10 mm, an angular radius of 5 mm (φ10R5), and a magnetic flux density of 800 mT. The gap g between the polishing tool 2 and the object 1 is selected from three values of 0.3 mm, 0.5 mm, and 1.0 mm, the rotation speed N is selected from two values of 300 rpm and 500 rpm, and the scanning operation is performed at a moving speed of 120 mm. / Min, moving pitch 0.1 mm. As the magnetic paste 3, a powder prepared to 75% magnetic powder and 25% vegetable oil was used.

In the surface treatment (polishing) of the sample, when scanning is performed along the dome-shaped convex surface, there is a boundary L where the finish cannot be said to be satisfactory as shown in FIG. When measured at the boundary L of the finish, the effective diameter de of the permanent magnet 20 in the gap g = 0.3 mm is
4.33 mm (rotation speed N = 300 rpm)
2.58 mm (rotation speed N = 500 rpm)
It has become. Here, since the circumferential speed V is a single point speed on the circumference, it can be calculated by the above-described equation (2). The diameter d is the outer diameter or effective diameter de of the permanent magnet 20 of the magnetic field generation source, and the circumferential speed V is calculated from the equation (2) with the effective diameter de described above.
0.068m / sec (rotation speed N = 300rpm)
0.068m / sec (rotation speed N = 500rpm)
It is obtained.

In the gap g = 0.5 mm, the effective diameter de of the permanent magnet 20 is
4.58mm (rotation speed N = 300rpm)
2.81 mm (rotation speed N = 500 rpm)
With these effective diameters de, the peripheral speed V is from equation (2):
0.072m / sec (rotation speed N = 300rpm)
0.074m / sec (rotation speed N = 500rpm)
It is obtained.

In the gap g = 1.0 mm, the effective diameter de of the permanent magnet 20 is
5.22 mm (rotation speed N = 300 rpm)
3.22 mm (rotation speed N = 500 rpm)
With these effective diameters de, the peripheral speed V is from equation (2):
0.082m / sec (rotation speed N = 300rpm)
0.084m / sec (rotation speed N = 500rpm)
It is obtained.

  Next, the moving speed of the scanning operation was reduced to 60 mm / min, and the surface treatment was performed in the same manner with twice the polishing time. However, it was confirmed that the effective diameter de was almost the same with the finishing boundary L almost unchanged. did. For this reason, description of measurement data is omitted.

At the effective diameter de described above, the peripheral speed V takes the values shown in Table 1 when the rotational speed N is in the range of 50 rpm to 1000 rpm.

  As apparent from Table 1, since the circumferential speed V is a single point on the circumference, it is determined in accordance with the circumference, that is, the rotational speed N of the effective diameter de. Although changing, increasing the rotation speed N increases the finishing boundary L and decreases the effective diameter de. For this reason, even if the rotation speed N changes, there is almost no change in the peripheral speed V at which polishing can be performed properly. Therefore, if the circumferential speed V is greater than or equal to the predetermined value for the effective diameter de, polishing can be performed satisfactorily, and the circumferential speed V is an index. Above the finishing boundary L, since the peripheral speed V is low, the fine cutting action is greatly reduced, and it can be said that it takes too much time and is not practical.

Regarding the gap g between the permanent magnet 20 of the magnetic field generation source and the object 1, the finishing boundary L decreases as the gap g increases, and the peripheral speed V increases as the effective diameter de increases. When the circumferential velocity V at the finishing boundary L is plotted with respect to the gap g, it becomes a substantially straight line as shown in FIG. 4 and can be expressed by a linear function. That is, the circumferential speed V has a first-order correlation with the gap g, and according to the measurement result shown in FIG.

V [m / sec] = 0.178 g + 0.0637 (1)

This is the relational expression (1) described above.

(Verification on 45 degrees slope)
The shape of the sample was changed, and surface treatment (polishing) was performed with the same configuration and procedure. The sample was a plate member made of an acrylic material, and was held in an inclined posture of 45 degrees with respect to the polishing tool 2 as shown in FIG.

  As for the surface treatment conditions, the polishing tool 2 used a permanent magnet 20 as a spherical neodymium magnet, an outer diameter of 6 mm, an angular radius of 3 mm (φ6R3), and a magnetic flux density of 800 mT. The gap g between the polishing tool 2 and the object 1 is 0.1 mm, the rotation speed N is selected from five values of 100, 200, 300, 600, and 1000 rpm, the scanning operation is a moving speed of 120 mm / min, a moving pitch of 0. It was 1 mm. As the magnetic paste 3, a powder prepared to 75% magnetic powder and 25% vegetable oil was used.

  The sample was polished by changing the number of revolutions N, and the surface roughness (arithmetic average roughness Ra, maximum roughness Ry) after polishing was evaluated. When the sample was polished, the results shown in FIG. 6 were obtained. The arithmetic average roughness Ra and the maximum roughness Ry at the rotational speed N = 0 were values before polishing, and the arithmetic average roughness Ra and the maximum roughness were obtained. It was confirmed that the minimum value Ry was obtained when the rotational speed N was 200 rpm to 300 rpm.

When the permanent magnet 20 has an outer diameter of 6 mm (φ6R3), the effective diameter de is 4.24 mm with respect to the 45 ° slope, and this is obtained from the calculation. And the peripheral speed V is
0.022 m / sec (rotation speed N = 100 rpm),
0.044 m / sec (rotation speed N = 200 rpm),
0.067 m / sec (rotation speed N = 300 rpm),
0.133 m / sec (rotation speed N = 600 rpm),
0.222 m / sec (rotation speed N = 1000 rpm)
It becomes.

  As is apparent from the graph of FIG. 6, good finish can be obtained when the rotational speed N is 200 rpm to 300 rpm, and the peripheral speed V is in the range of 0.044 m / sec to 0.067 m / sec. Polishing with a rotational speed N of 600 rpm or more confirmed that the surface roughness was improved from the initial value, but the surface was scratched. Therefore, it can be said that the peripheral speed V of 0.133 m / sec is too high for the sample (acrylic material).

  On the other hand, if the gap g is 0.1 mm or less, the risk of damaging the surface of the sample is increased, and the magnetic paste 3 becomes difficult to exist in the gap g. .

  As for the 45-degree slope from the above, when the gap g is 0.1 mm, the effective diameter de = 4.24 mm, and the peripheral speed V is about 0.044 m / sec to 0.067 m / sec. It can be carried out. However, when calculating from the above equation (1), the peripheral speed V can be 0.067 m / sec, and the peripheral speed V of 0.044 m / sec is insufficient for the condition for finishing the acrylic material transparent. I know that. Considering these points, for the surface treatment with the gap g of 0.1 mm, the peripheral speed V is preferably 0.067 m / sec or more, and this should be the lower limit.

  In addition, since a sample is formed from an acrylic material, it is needless to say that a metal material or the like that is relatively soft and has a higher hardness needs a value that is not less than the lower limit determined here. Therefore, conversely, the value relating to the acrylic material determined here may be considered as the lower limit value, which is rather convenient in practice.

(Verification of upper limit of peripheral speed V)
In order to know the upper limit value of the peripheral speed V, the rotational speed N at which the magnetic paste 3 scatters was verified. The condition setting is generally the same as in the above two examples, and the polishing tool 2 is a neodymium magnet having a rounded rod shape as the permanent magnet 20, an outer diameter of 6 mm and a corner radius of 3 mm (φ6R3), and the magnetic flux density is 800 mT. As the magnetic paste 3, 5 g of 75% magnetic powder and 25% vegetable oil was prepared.

  As shown in FIG. 7, the container 6 was arranged so as to surround the tip portion of the polishing tool 2 as shown in FIG. 7, and the rotational speed N was sequentially increased from 500 rpm in 100 rpm steps, and the rotational speed N at which scattering started was recorded.

  As a result, it was confirmed that the rotation speed N was not scattered up to 1700 rpm, and scattering occurred at 1800 rpm. Since the permanent magnet 20 of the polishing tool 2 has an outer diameter of 6 mm and an angular radius of 3 mm (φ6R3), the rotational speed N = 1700 rpm is the peripheral speed V = 0.534 m / sec, and therefore the maximum peripheral speed Vmax that does not cause scattering is 0. .534 m / sec, which is the upper limit.

  The scattering of the magnetic paste 3 occurs when the centrifugal force due to the rotational speed N of the polishing tool 2 exceeds the magnetic attractive force, so that the value of the maximum peripheral speed Vmax is the magnetic flux density of the permanent magnet 20 and the magnetic paste 3. Although it depends on the magnetic composition, as described above, the maximum peripheral speed Vmax determined here is 1700 rpm, and the surface treatment is performed at a lower speed, so that it is considered to be an upper limit from a practical aspect. Good.

(Verification of magnetic flux density)
The magnetic flux density was measured for a plurality of polishing tools 2. In the polishing tool 2, the permanent magnet 20 is a spherical neodymium magnet, the outer diameter is 6 mm, the corner radius is 3 mm (φ6R3), the outer diameter is 10 mm, the corner radius is 5 mm (φ10R5), the outer diameter is 15 mm, and the corner radius is 7.5 mm (φ15R7). .5) were prepared, and the magnetic flux density was measured for the tip apex portion and the portion having a sandwich angle of 45 degrees with the central axis. The top of the tip will be called TOP. And the part where the angle between the central axis and the central axis is 45 degrees is a part facing the 45 degree slope shown in FIG. 5 and will be called a 45 degree part.

  As a result, the graphs shown in FIGS. 8, 9, and 10 were obtained. In these graphs, the horizontal axis is the interval, that is, the gap g in the surface treatment, the solid line is the magnetic flux density at TOP, and the dotted line is the magnetic flux density at the 45-degree region. 8 shows the data of the permanent magnet 20 of the magnetic field generation source (φ6R3), FIG. 9 shows the data of the permanent magnet 20 of the magnetic field generation source (φ10R5), and FIG. 10 shows the data of the permanent magnet 20 of the magnetic field generation source (φ15R7.5). In any case, it was confirmed that when the gap g is 1.0 mm, the magnetic flux density can exceed 400 mT, but when the gap g is 2.0 mm, the magnetic flux density can be obtained only at 400 mT or less.

  The above verification has led to the following view.

  As is clear from (verification on the dome-shaped convex surface), the polishing can be performed satisfactorily if the peripheral speed V at the effective diameter de is equal to or higher than a predetermined value, and the finishing boundary L is increased by increasing the rotational speed N. Since the effective effective diameter de increases, the peripheral speed V at which the polishing can be properly performed hardly varies even when the rotational speed N changes. Therefore, if the peripheral speed V is greater than or equal to a predetermined value for the effective diameter de, polishing can be performed satisfactorily, which is an index. And regarding the clearance g between the permanent magnet 20 of the magnetic field generation source and the object 1, the peripheral speed V has a first-order correlation with the clearance g and can be expressed by the above-described equation (1).

Since the peripheral speed V is a single point speed on the circumference, it can be calculated by the above-described equation (2), and the diameter d is the outer diameter or effective diameter de of the permanent magnet 20 of the magnetic field generation source. When d or effective diameter de is in the range of 0.1 mm to 10 mm, and the rotation speed N is in the range of 200 rpm to 2100 rpm, the peripheral speed V is obtained as shown in Table 2.

  Therefore, for example, consider a case where the polishing tool 2 has a spherical permanent magnet 20 with an outer diameter of 10 mm and an angular radius of 5 mm (φ10R5), and a gap g with the object 1 of 1.5 mm. First, by substituting into the relational expression (1) with respect to the gap g, it is found that the peripheral speed V that is the lower limit value is 0.0904 m / sec. Since (the verification of the upper limit value of the circumferential speed V) is the maximum circumferential speed Vmax = 0.534 m / sec, as can be seen from Table 2, 0.534 m / sec has a rotational speed N of 1000 rpm when the diameter d = 10 mm. Since it is in the place where it exceeds, it can be said that 1000 rpm is the limit of the rotation speed N. When the above lower limit value and upper limit value are applied to Table 2, it can be said that the finishing of the surface can be completed properly and satisfactorily until the diameter d is about 1.8 mm. That is, the effective diameter de of the magnetic field source is It turns out that the minimum value is about 1.8 mm.

  Thus, the relational expression (1) of the peripheral speed V can be used as an index for completing the surface finishing properly and satisfactorily. By using the index, a fine cutting action by non-contact can be achieved. You can get it without failure.

Further, when the results of the verification are arranged, the peripheral speed V is a value shown in Table 3 for the gap g. FIG. 11 is a graph in which Table 3 is plotted, and shows the range of the peripheral speed V at which polishing can be satisfactorily obtained.

  By increasing the gap g, the lower limit value of the peripheral speed V increases in order, and it is necessary to set a larger value correspondingly.

  When the gap g is 0.1 mm or less, there is a high risk that the objects 1 may be damaged by contact with each other due to the movement of the polishing tool 2 due to variations in scanning operation. In addition, it becomes difficult for abrasive grains to exist between the permanent magnet 20 and the object 1, and the working force for fine shaving is reduced and the processing time is prolonged, so that it is not suitable for practical use, and the gap g = 0.1 mm is the lower limit. You may think.

  When the gap g is 2.0 mm or more, the magnetic flux density is reduced to 400 mT or less from (verification of magnetic flux density), and when 400 mT or less, the working force for fine shaving is reduced and the processing time is increased. There is a tendency and practicality is low. Therefore, the gap g = 2.0 mm may be considered as the upper limit.

1 is a side view showing a preferred embodiment of the present invention. It is a perspective view of the block body which showed an example of the target object and was formed from the acrylic material. It is a side view explaining the fine cutting action by the grinding tool, and shows the relationship between the effective diameter de of the spherical magnetic field generation source and the finishing boundary L. It is a graph which shows the peripheral speed V regarding the clearance gap g between a magnetic field generation source and a target object. It is a perspective view explaining the fine shaving effect | action by a grinding | polishing bite, and has shown the example in a 45 degree slope. It is a graph which shows the measurement result of surface roughness about the sample of a 45 degree | times slope, and the rotation speed N = 0 has displayed the surface roughness before a fine cutting process. FIG. 6 is a side view showing a polishing tool portion that is a configuration for verifying an upper limit value of a peripheral speed. It is a graph which shows the measurement result of magnetic flux density about a grinding tool, and a magnetic field generation source is spherical (φ6R3). It is a graph which shows the measurement result of magnetic flux density about a grinding tool, and a magnetic field generation source is spherical (φ10R5). It is a graph which shows the measurement result of magnetic flux density about a grinding tool, and a magnetic field generation source is spherical (φ15R7.5). It is a graph which shows the peripheral speed V regarding the clearance gap g of a magnetic field generation source and a target object, and has shown the range of the peripheral speed from which grinding | polishing is acquired favorably.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Object 2 Polishing tool 3 Magnetic paste 4 Support stand 5 Drive means 6 Container 20 Permanent magnet (magnetic field generation source)

Claims (2)

A surface treatment method in which a magnetic field generation source is faced in a non-contact manner with respect to an object, a magnetic paste existing in the periphery is interlocked, and a surface treatment is performed by a fine shaving action of a particle population generated by a magnetic field,
The gap g between the object and the magnetic field generation source is in the range of 0.1 mm to 2.0 mm, and the peripheral speed V of the rotating operation of the magnetic field generation source is

V [m / sec] = 0.178 g + 0.0637

A surface treatment method using a fine shaving action, characterized in that the surface treatment is carried out so that the peripheral speed V is not less than the lower limit value.   The peripheral speed V has an upper limit value that is a maximum peripheral speed Vmax = 0.534 m / sec at which the magnetic paste does not scatter, and the peripheral speed V is within a range between the lower limit value and the upper limit value. The surface treatment method according to claim 1, wherein the surface treatment method is based on a fine shaving action.

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