JPH1071555A - Magnetic polishing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the working efficiency and the working quality, by making constant the amount of a magnetic powder at the position where the magnetic polishing is carried out. SOLUTION: In a magnetic polishing method which consists of a drivable iron core 1 and a coil 2 to give the magnetic force to the iron core 1, in which the magnetic powder 3 is attracted magnetically to the iron core 1, and a liquid abrasive is fed separately to carry out the working, the amount of the magnetic powder 3 existing at the working part during the magnetic polishing is detected, the feeding amount of the magnetic powder 3 is controlled depending on the detected information, and the amount of the magnetic powder 3 at the working part is made constant.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to magnetic polishing used mainly for deburring and surface polishing of pressed parts such as hoop-shaped metal sheets, such as electric razor blades, relay parts, microswitch parts and connector parts. Regarding the method,
More specifically, the present invention relates to a technique for stabilizing the amount of magnetic powder in a portion where magnetic polishing is performed, thereby improving processing efficiency and processing quality.

[0002]

2. Description of the Related Art Conventionally, as a method of supplying magnetic powder in magnetic polishing, as shown in JP-A-3-202267 shown in FIG. Is to be supplied to

[0003]

However, in such a method, magnetic polishing such as press deburring of a metal hoop material after pressing and deburring of the surface of a razor blade can be effectively used. Thought,
Magnetic polishing of such a metal hoop material has the following problems.

1) Since it is a long object, it is necessary to continuously process it. However, as shown in the conventional example, there is no means capable of continuously supplying magnetic powder such as a magnetic grindstone or iron powder. The processing efficiency is low because the processing is stopped. 2) If only the magnetic powder is continuously supplied, the magnetic powder adheres to the workpiece and is taken out, or the magnetic powder flows out due to a machining fluid such as a polishing liquid or a lapping oil. There is a problem in that the amount of powder changes and the processing efficiency and processing quality vary and become unstable.

The present invention is intended to solve such a problem, and an object of the present invention is to continuously supply magnetic powder and to stabilize the amount of magnetic powder at a processing location.
An object of the present invention is to provide a magnetic polishing method capable of stabilizing processing efficiency and processing quality.

[0006]

According to the first aspect of the present invention, a drivable iron core 1 and a coil 2 for applying a magnetic force to the iron core 1 are provided. In a magnetic polishing method in which a liquid abrasive is separately supplied and processed, the amount of magnetic powder 3 present in a processed portion during magnetic polishing is detected, and the supply amount of magnetic powder 3 is controlled based on the detection information. Thus, the amount of the magnetic powder 3 in the processed portion is made constant.

According to a second aspect of the present invention, there is provided a magnetic polishing apparatus comprising a drivable iron core 1 and a coil 2 for applying a magnetic force to the iron core 1, wherein a magnetic powder 3 and a polishing member 5 are mixed and sintered on the iron core 1. In a magnetic polishing method for processing by magnetically adsorbing a material or by mixing and supplying a magnetic powder 3 and a liquid abrasive, a magnetic polishing material or a magnetic powder 3 present in a processed portion during magnetic polishing.
The amount of the magnetic powder 3 is controlled, and the supply amount of the magnetic powder 3 is controlled based on the detection information, so that the amount of the magnetic powder 3 in the processed portion is made constant.

According to the third aspect of the present invention, the means for detecting the magnetic powder 3 divides the yoke 7 in the magnetic circuit to provide a gap G, detects the magnetic flux density in the gap G, and based on the detection result. The amount of the magnetic powder 3 existing in the gap 8 between the iron cores 1 and 1 is measured. In the invention according to claim 4, a means for detecting the magnetic powder 3 is provided on the downstream side in the feed direction of the workpiece W with respect to the processing head 9, and the amount of the magnetic powder 3 attached to the workpiece W and taken out is measured. It is characterized by the following.

According to the fifth aspect of the present invention, the means for detecting the magnetic powder 3 includes the guide rails 10 and 1 for guiding the workpiece W.
A force sensor 12 such as a load cell 11 is provided at the end of the shaft 0, and the force sensor 12 detects the force applied to the workpiece W to measure the amount of the magnetic powder 3 present in the machined portion. It is. According to the sixth aspect of the present invention, the supply of the magnetic powder 3 is performed by the mono pump 13 and the mono pump 1.
The method is characterized in that a motor capable of controlling the rotation speed such as a servomotor or a stepping motor is used as the driving source of No. 3.

The invention according to claim 7 is characterized in that the magnetic powder 3 to be supplied to the mono pump 13 is mixed and supplied as a liquid surfactant 39. The invention according to claim 8 is characterized in that the magnetic powder 3 to be supplied to the mono pump 13 is mixed with a high-viscosity gel substance 40 and supplied. According to the ninth aspect of the present invention, the magnetic powder 3 to be supplied is supplied from a rotary, vibratory, or auger-type powder quantitative supply device 15 using a motor capable of controlling the rotation speed of a servo motor, a stepping motor, or the like as a driving source. Is connected to a pipe 17 through which compressed air flows, and the magnetic powder 3 is supplied under pressure by air pressure.

In the structure of the first aspect, the amount of the magnetic powder 3 in the processing section can be constantly monitored and controlled to be constant, and the processing efficiency and the processing quality can be stabilized. According to the configuration of the second aspect, the amount of the magnetic powder 3 in the processing section can be constantly monitored and controlled to be constant, and the processing efficiency and the processing quality can be stabilized.

According to the third aspect of the present invention, the amount of the magnetic powder 3 can be easily detected by providing the gap G in the magnetic circuit and detecting the magnetic flux density at this location. In the configuration of claim 4, even if the gap portion 8 of the processing portion is wide and the diameter of the iron cores 1 and 1 is large, the magnetic powder 3 adhered to the workpiece W and taken out without being affected by them. By detecting the amount, the amount of the magnetic powder 3 in the processed portion can be easily detected.

According to the configuration of the fifth aspect, the amount of the magnetic powder 3 can be detected without magnetic loss (reducing the processing efficiency). In the configuration of claim 6, when supplying the magnetic powder 3, even if the supply amount is very small, the supply accuracy can be improved, and there is no pulsation, and stable supply is possible. Claim 7
In the configuration (1), the magnetic powder 3 can be uniformly dispersed in the supply medium, and stable supply can be achieved.

According to the configuration of the eighth aspect, the magnetic powder 3 can be uniformly dispersed in the supply medium, sedimentation can be prevented, and stable supply can be achieved. In the configuration of claim 9, when supplying the magnetic powder 3, the supply accuracy can be improved even with a small supply amount, there is no pulsation, stable supply is possible, and a binder is not required.

[0015]

FIG. 1 shows an embodiment of a magnetic polishing apparatus used for a magnetic polishing method according to the present invention.
Is sent in a direction perpendicular to the plane of the paper. Iron cores 1 and 1 facing each other are provided on both sides of the workpiece W with a substantially constant gap 8 therebetween. Coils 2 and 2 are provided around the iron cores 1 and 1 by winding copper wires around the cores. A direct current is supplied to both coils 2 and 2 so that the opposing surfaces of the iron cores 1 and 1 have opposite polarities. A substantially U-shaped yoke 7 is provided on the side of the iron core 1 opposite to the surface facing the workpiece W to form a magnetically closed circuit.
The iron core 1 is rotatably supported and can be driven to rotate by a motor 14. The driving method may be oscillating motion or ultrasonic vibration.

The magnetic powder 3 is an atomized iron powder having a particle diameter of 50.
The one having a thickness of about 200 μm is used. Processing fluid is $ 100
A water-soluble polishing liquid containing about 0 to about $ 10,000 WA abrasive grains, a surfactant, an antifoaming agent, and water is used. In addition, a magnetic abrasive material obtained by mixing iron powder and abrasive grains as a magnetic powder 3 and sintering, and a water-soluble grinding liquid or a lapping oil as a working liquid can be suitably used. In this embodiment, the magnetic powder 3 is mixed with a polyacrylic acid-based thickener, a propylene glycol-based dispersant, and a high-viscosity gel-like substance containing water at a weight ratio of about 30 to 80%. I have.

As a supply source of the magnetic powder 3, a well-known mono type having a uniaxial eccentric screw type rotor having a circular cross section and a stator having a rectangular cross section, and transferring a substance filled in both spaces from the suction side to the discharge side. The pump 13 is used, and a stepping motor 35 whose rotation speed can be controlled arbitrarily and with high accuracy is used as a drive source of the mono pump 13.
The rotation shaft of the stepping motor 35 and the rotation shaft of the mono pump 13 are fastened by a coupling joint 18.

The magnetic powder 3 mixed with the gel-like substance 40 is filled in a hopper 19 provided at a suction port of the mono pump 13, and the filled magnetic powder 3 is rotated by the stepping motor 35 through the mono pump 13. Thus, an amount proportional to the rotation speed is discharged from the discharge port 20. A tube 21 is connected to the discharge port 20 via a joint.
Is extended to the side or above the gap 8 between the iron core 1 of the processing portion and the workpiece W.

The polishing liquid is also applied to the iron core 1 of the processing part and the workpiece W.
A nozzle 22 is provided on the side of or above the gap 8 between the nozzles, and a liquid sent from a polishing liquid pump (not shown) is discharged to the processing section. Note that the supply liquid amount can be arbitrarily adjusted according to the processing state. A small gap G is provided in the yoke 7, and a thin magnetic sensor 23 is inserted into the gap G, and the gap G
The magnetic flux density of the part is measured.

The value of the measured magnetic flux density is indicated by a Gauss meter 24.
Is output as an analog voltage value from the output terminal of the data processing device 25 and enters the input terminal of the data processing device 25. Data processing device 25
Then, the analog voltage data is A / D converted at a desired sampling frequency, and the value of the magnetic flux density is recorded over time. When the exciting current to the coil 2 is constant, and when the amount of the magnetic powder 3 in the processed portion increases, the apparent magnetic permeability in the gap 8 between the workpiece W and the end face of the iron core 1 increases. Therefore, the magnetic flux density between the opposed iron cores 1 and 1 increases, and the magnetic flux density flowing through the yoke 7 also increases.

Conversely, when the amount of the magnetic powder 3 in the processed portion decreases, the density of the magnetic flux flowing through the yoke 7 decreases. Therefore, it is possible to detect a change in the amount of the magnetic powder 3 in the processed portion as a change in the value of the magnetic flux density. If the relationship between the amount of the magnetic powder 3 and the magnetic flux density is grasped in advance, the magnetic flux density at that time can be detected. It can be easily understood how many grams the amount of the magnetic powder 3 corresponds to (see FIG. 2).

If the detected value exceeds the predetermined range of the amount of the magnetic powder 3, a command to change the rotation speed of the stepping motor 35 is issued to the controller 36 for controlling the stepping motor 35, and The frequency signal of the motor driver 37 is increased or decreased so as to change the supply amount by an error from a predetermined amount of the magnetic powder 3 such that the rotation speed decreases if the amount is large and the rotation speed increases if the amount is small (see FIG. 3). .
A personal computer or the like can be suitably used for the data processing device 35 and the controller 36.

As described above, according to the first and second aspects of the present invention, since the amount of the magnetic powder 3 is constantly monitored and controlled to be constant, it is possible to obtain stable processing efficiency and processing quality. You can do it. And Claim 3
In the present invention, the gap G is provided by dividing the yoke 7 in the magnetic circuit, the magnetic flux density in the gap G is detected, and the magnetic flux density is present in the gap 8 between the iron cores 1 and 1 based on the detection result. The amount of the magnetic powder 3 is measured, and the amount of the magnetic powder 3 can be easily detected by providing the gap G in the magnetic circuit and detecting the magnetic flux density at this location.

More specifically, as shown in FIG. 4, a brass plate 7c is interposed between the yoke members 7a and 7b so that the brass bolt 3
8 to form a gap G,
The head of the magnetic sensor 23 is inserted into the sensor to detect the magnetic flux density at this point.
FIG. 5 shows an embodiment of the fourth aspect of the present invention. When the gap between the magnetic poles (iron core 1) of the processing head 9 is large and the head diameter is large, the space volume between the magnetic poles is large. , The change in magnetic flux density at the head insertion portion of the magnetic sensor 23 is at a level that cannot be detected. The present invention is used for detecting the amount of the magnetic powder 3 in the case described above. Since the gap 8 in the magnetic pole portion for detection is small, the change in the amount of the magnetic powder 3 is slight. Even if there is, it can be detected.

That is, the same coil 2d and yoke 7 as in FIG.
d is provided separately from the machining head 9 on the downstream side in the feed direction of the workpiece W, a gap Gd of about 1 mm is provided at the center of a substantially U-shaped yoke 7d, and the workpiece W is caused to flow through the center. A gap Ge similar to that shown in FIG. 1 is provided at the corner of the substantially U-shaped yoke 7d, and the head of the magnetic sensor 23 is inserted.

When the workpiece W is made of a magnetic material such as iron, the magnetic powder 3 adheres to the workpiece W and is taken out of the workpiece W.
The amount of the magnetic powder 3 that is magnetically attracted to the magnetic pole of the detection portion downstream and adheres to the magnetic pole end surface and thus adheres to the magnetic pole with the elapse of the processing time of the workpiece W increases, and accordingly, the detection portion Magnetic flux density also increases. Thus, the magnetic flux density after a certain period of time is set to be measured every time, it is determined whether the value of the magnetic flux density is a predetermined value, and the amount of the magnetic powder 3 existing in the machining head 9 is determined. Guess.

If the magnetic flux density is smaller than the predetermined magnetic flux density, the amount of the magnetic powder 3 attached to the workpiece W is small and the amount of the magnetic powder 3 existing in the machining head 9 is small. Of the motor controller 36 to increase the rotation speed. On the other hand, if it is larger, a command to lower the rotation speed is issued. After the measurement of the magnetic flux density, the exciting current of the coil 2d is once turned off, and the magnetic powder 3 existing between the magnetic poles is dropped and removed. At this time, depending on the case, it may be blown off with compressed air or may be made to flow with running water. Thereafter, the exciting current of the coil 2d is turned on again, and measurement of the magnetic flux density is started.

FIG. 6 shows an embodiment of the fifth aspect of the present invention. The workpiece W is sent from right to left in the drawing. The workpiece W is sent while being wound around and guided by a pair of circular guide rolls 10 and 10a. The iron core 1 is provided above the workpiece W, and a substantially U-shaped yoke 7 is provided on the side opposite to the surface facing the workpiece W, and another end surface of the yoke 7 is connected to the end surface of the iron core 1. And a magnetically closed circuit.

The iron core 1 is rotatably supported, and is rotatably driven by a motor (not shown). The shaft ends of guide rolls 10a and 10a near both sides of the processing head 9 are fitted to bearings 26, and the bearings 26 are fitted and supported by bearing cases 27. The bearing case 27 is fixed to a box-shaped load cell 11, which is an example of the force sensor 12, and the load cell 11 can detect a vertical compression force. Load cell 11
The force detected by the amplifier is amplified by the amplifier, and is taken in from the output terminal of the amplifier into the same data processing device 25 as in FIG. The magnetic powder 3 is supplied in the same manner as in FIG. 1 and starts magnetic polishing, and at the same time, detection of a force by the load cell 11 is also started. When the amount of the magnetic powder 3 is stable, a constant polishing pressure is applied to the workpiece W, so that a constant force is also detected in the load cell 11. However, when the amount of the magnetic powder 3 increases, Since the polishing pressure on the object W increases and the force applied to the load cell 11 also increases, if the relationship between the amount of the magnetic powder 3 and the load detected by the load cell 11 is grasped in advance, the monitoring of the load detected by the load cell 11 allows the magnetic powder 3 to be monitored. This makes it possible to detect the amount of

According to the fifth aspect of the present invention, the amount of the magnetic powder 3 can be detected without lowering the processing efficiency because there is no magnetic loss, as compared with the method in which the gap G is provided in the middle of the yoke 7. . Further, the breakage of the workpiece W can also be detected. The embodiment of the invention of claim 6 has been described in the embodiments of claims 1 and 2, and will not be described.

FIG. 7 shows a main part of an embodiment of the invention of claim 7. Generally, since the helical rotor and the stator are fitted in the mono pump 13, the magnetic powder 3
Is supplied as it is, there is a disadvantage that the rotor and the stator are quickly worn. In order to prevent this, a method in which the magnetic powder 3 is mixed with water and supplied is conceivable. However, with water alone, there is a disadvantage that the magnetic powder 3 (iron powder) immediately sinks and hardens.

As a countermeasure against this, the invention of claim 7 utilizes the fact that the surfactant 39 has a role of uniformly dispersing the abrasive and enhancing the lubricating ability, for example, a polycarboxylate, phosphoric acid, and the like. By mixing the viscous surfactant 39 such as an ester and the magnetic powder 3 and supplying the mixture to the mono pump 13, wear of the rotor and the stator of the mono pump 13 is prevented, and sedimentation of the magnetic powder 3 is prevented. The supply is stabilized by dispersion.

FIG. 8 shows a main part of an embodiment of the invention of claim 8. According to an eighth aspect of the present invention, a high-viscosity gel-like substance 40 is used in place of the surfactant 39 to prevent wear of the rotor and the stator of the mono pump 13 as in the seventh embodiment. I have. The components of the gel-like substance 40 have been described in detail in the first and second aspects and will not be described.

According to an embodiment of the present invention, there is provided a machining head 9 having a coil 2 similar to that shown in FIG.
In the configuration of the magnetic powder supply device, for example, using a rotary (circle type), vibration type, auger type and other powder quantitative supply machine,
A servo motor or a stepping motor capable of arbitrarily controlling the rotation speed with high precision is used as a drive source. FIG. 9 shows an example in which a rotary feeder is used for the powder supply device.

The rotary feeder 30 cuts out the powder filled in the hopper 31 from the gap between the hopper 31 and the rotary table to the outside of the hopper 31 by rotating the impeller, and discharges the magnetic powder 3 cut out on the outer peripheral portion from the discharge port 32. Discharge. A substantially inverted conical hopper 3 is provided at the discharge port 32 of the rotary feeder 30.
1, a pipe 33 through which compressed air flows is connected to a lower end of the hopper 31 via a joint 34, and the pipe 33 through which compressed air flows has an end face disposed on the side or above the gap 8 of the processing head 9. Has been established.

After the magnetic powder 3 exits from the discharge port 32, it falls into the hopper 31, stays at the lower part of the hopper 31, and is sucked into the pipe 33 by the back pressure of the compressed air. Is sent to the vicinity of and discharged. The discharged magnetic powder 3 is magnetically attracted and enters the gap 8 having the highest magnetic flux density. At this time, the pressure and the flow rate of the supply air are appropriately adjusted so that the magnetic powder 3 and the polishing liquid in the gap 8 are not scattered.

Thus, even if the supply amount is very small, the supply can be controlled with high precision and there is no pulsation, so that a stable fixed amount supply is possible and a binder is not required.

[0038]

According to the first aspect of the present invention, there is provided a drivable iron core and a coil for applying a magnetic force to the iron core. The magnetic powder is magnetically attracted to the iron core, and a separate liquid abrasive is supplied. In the magnetic polishing method of processing, the amount of magnetic powder present in the processed part during magnetic polishing is detected, and the supply amount of the magnetic powder is controlled based on the detection information, and the amount of magnetic powder in the processed part is controlled. Since it is made constant, the amount of magnetic powder in the processing section can be constantly monitored and controlled to be constant, and there is an advantage that the processing efficiency and the processing quality can be stabilized.

According to the second aspect of the present invention, the magnetic abrasive is made of a drivable iron core and a coil for applying a magnetic force to the iron core. In the magnetic polishing method of processing or mixing and supplying a magnetic powder and a liquid abrasive, the amount of the magnetic abrasive or magnetic powder present in the processed part during the magnetic polishing is detected, and the detected information is Since the supply amount of the magnetic powder is controlled based on the amount of the magnetic powder in the processing unit and the amount of the magnetic powder in the processing unit is constant, the amount of the magnetic powder in the processing unit can be constantly monitored and controlled to be constant. There is an advantage that processing efficiency and processing quality can be stabilized.

According to the third aspect of the present invention, the magnetic powder detecting means divides the yoke portion in the magnetic circuit to provide a gap, detects the magnetic flux density in the gap, and detects the magnetic flux density in the gap based on the detection result. Since the amount of magnetic powder present in the gap portion is measured, there is an advantage that the amount of magnetic powder can be easily detected by providing a gap in the magnetic circuit and detecting the magnetic flux density at this location. .

According to the fourth aspect of the present invention, the magnetic powder detecting means is provided on the downstream side of the work head in the feed direction of the work, and the amount of the magnetic powder attached to the work and taken out is measured. Even if the gap between the parts is large and the diameter of the iron core is large, the amount of magnetic powder adhered to the workpiece and taken out is detected without being affected by these, so that the amount of magnetic powder in the machined part can be reduced. There is an advantage that detection can be easily performed.

According to the fifth aspect of the present invention, the magnetic powder detecting means is provided with a force sensor such as a load cell at a shaft end of a guide rail for guiding the work, and detects a force applied to the work by the force sensor. Therefore, there is an advantage that the amount of magnetic powder can be detected without magnetic loss (reducing the processing efficiency).

According to the sixth aspect of the present invention, the supply of the magnetic powder is performed using a motor-type pump and a motor such as a servo motor or a stepping motor which can control the rotation speed as a driving source of the motor-type pump. There is an advantage that the supply accuracy can be increased even if the supply amount is very small, there is no pulsation, and a stable supply is possible.

According to the seventh aspect of the present invention, since the magnetic powder to be supplied to the mono pump is mixed and supplied as a liquid surfactant, the magnetic powder can be uniformly dispersed in the supply medium and can be stably dispersed. There is an advantage that a reliable supply is possible. According to the invention of claim 8, since the magnetic powder to be supplied to the mono pump is mixed with the high-viscosity gel substance and supplied, the magnetic powder can be uniformly dispersed in the supply medium and sedimentation is prevented. This has the advantage that stable supply is possible.

According to the ninth aspect of the present invention, the magnetic powder to be supplied is supplied in a fixed quantity such as a rotary type, a vibration type, an auger type, etc. using a motor capable of controlling a rotation speed such as a servo motor or a stepping motor as a driving source. The discharge port of the device is connected to the pipe through which the compressed air flows, and the magnetic powder is fed by air pressure and supplied. There is an advantage that there is no pulsation, stable supply is possible, and no binder is required.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing an embodiment of the present invention.

FIG. 2 is a graph showing the relationship between the amount of magnetic powder and the magnetic flux density in a gap.

FIG. 3 is a flowchart illustrating a supply process of a magnetic powder.

FIG. 4 shows a gap, (a) is a horizontal sectional view, (b)
Is a side sectional view.

FIG. 5 is a diagram for explaining the invention of claim 4;

FIG. 6 is a diagram for explaining the invention of claim 6;

FIG. 7 is a schematic diagram of a case where a surfactant and a magnetic powder according to the invention of claim 7 are mixed.

FIG. 8 is a schematic view showing a case where a high-viscosity gel-like substance and a magnetic powder according to the invention of claim 8 are mixed.

FIG. 9 is a diagram for explaining the invention of claim 9;

FIG. 10 is a sectional view of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Iron core 2 Coil 3 Magnetic powder 5 Polishing member 7 Yoke 8 Gap 9 Processing head

Claims (9)

[Claims] 1. A magnetic polishing method comprising a drivable iron core and a coil for applying a magnetic force to the iron core, magnetically adsorbing magnetic powder on the iron core, and separately supplying a liquid abrasive to process the magnetic polishing method. , Detecting the amount of magnetic powder present in the processed part during magnetic polishing, controlling the supply amount of the magnetic powder based on the detection information, and stabilizing the amount of magnetic powder in the processed part. Characteristic magnetic polishing method. 2. A magnetic core comprising a drivable iron core and a coil for applying a magnetic force to the iron core. In a magnetic polishing method in which powder and a liquid abrasive are mixed and supplied for processing, the amount of magnetic abrasive or magnetic powder present in a processed portion during magnetic polishing is detected, and supply of the magnetic powder is performed based on the detection information. A magnetic polishing method, characterized in that the amount is controlled so that the amount of magnetic powder in the processed part is constant. 3. A detecting means for magnetic powder divides a yoke portion in a magnetic circuit to provide a gap, detects a magnetic flux density in the gap, and exists in a gap between iron cores based on a result of the detection. The magnetic polishing method according to claim 1 or 2, wherein the amount of the magnetic powder is measured. 4. A magnetic powder detecting means is provided downstream of a machining head in a feed direction of a workpiece to measure an amount of magnetic powder adhered to and taken out of the workpiece. Magnetic polishing method. 5. The magnetic powder detecting means includes a force sensor such as a load cell provided at a shaft end of a guide rail for guiding a workpiece, and detects a force applied to the workpiece by the force sensor, and is present in the machined portion. The magnetic polishing method according to claim 1 or 2, wherein the amount of the magnetic powder is measured. 6. The method according to claim 1, wherein the supply of the magnetic powder is performed by using a motor-type pump and a motor such as a servomotor or a stepping motor that can control the rotation speed as a driving source of the motor-type pump. Item 3. The magnetic polishing method according to Item 2. 7. The magnetic polishing method according to claim 6, wherein the magnetic powder supplied to the mono pump is mixed and supplied as a liquid surfactant. 8. The magnetic polishing method according to claim 6, wherein the magnetic powder supplied to the mono pump is mixed with a high-viscosity gel-like substance and supplied. 9. The magnetic powder to be supplied is compressed at a discharge port of a rotary, vibratory, or auger-type powder quantitative supply device using a motor capable of controlling a rotation speed such as a servo motor or a stepping motor as a driving source. The magnetic polishing method according to claim 1, wherein the magnetic powder is connected to a pipe through which air flows, and the magnetic powder is pressure-fed and supplied by air pressure.