Surface Treatment Equipment

Abstract

To explain a surface treatment device capable of locally polishing a surface of an object.SOLUTION: A surface treatment device 1A for polishing an inner surface Wa of a non-magnetic or a feebly magnetic object W is provided, comprising: a magnetic tool 3 which comprises a driven side magnetic portion 32 with a fixed a magnetic pole and can polish a surface of an object W by a relative movement to the object W; a magnetic unit 23 which comprises a driving side magnetic portion 26 with a fixed magnetic pole and can attract the driven side magnetic portion 32 by magnetic force; and an electric motor 21 rotating the magnetic unit 23 thereby rotating the magnetic tool 3 around a rotary axial line L passing through the magnetic tool 3.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a surface treatment device that performs a polishing treatment on the surface of an object such as an additive manufacturing product. [Background technology]

[0002] Surface treatment methods and devices that utilize magnetic force are known. For example, the surface treatment device described in Patent Document 1 polishes the inner surface of a pipe by introducing a slurry containing magnetic abrasive grains into the pipe and moving the slurry by rotating a magnet placed outside the pipe. In addition, the method described in Patent Document 2 polishes the inner surface of the pipe by inserting a ferromagnetic body into the pipe and moving a magnet placed outside the pipe in the longitudinal direction of the pipe. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 7-227755 [Patent Document 2] Japanese Patent Application Publication No. 8-99224 Summary of the Invention [Problem to be solved by the invention]

[0004] However, with conventional devices, it was difficult to polish localized areas, and it was particularly difficult to polish the inner surface of an object that had a complex web of curved projections and recesses that formed spaces inside.

[0005] The present disclosure describes a surface treatment apparatus capable of locally polishing the surface of an object. [Means for solving the problem]

[0006] One aspect of the present disclosure is a surface treatment device for polishing the surface of a non-magnetic or weakly magnetic object, comprising: a polishing processing section having a driven magnetic part with a fixed magnetic pole and capable of polishing the surface of the object by moving relative to the object, a movable part having a driving magnetic part with a fixed magnetic pole and capable of attracting the driven magnetic part by magnetic force, and a driving part for rotating the polishing processing section around a rotation axis passing through the polishing processing section by rotating the movable part. Note that in the present disclosure, weak magnetism means paramagnetism and diamagnetism.

[0007] For example, the polishing processing unit is arranged so as to contact the inner surface of the object that forms a space inside, and the movable unit is arranged near the outer surface on the opposite side of the object. The object is non-magnetic or weakly magnetic, and the movable unit can attract the polishing processing unit by magnetic force. The polishing processing unit is attracted to the movable unit and comes into close contact with the inner surface of the object. In this state, the driving unit rotates the movable unit. The driving side magnetic unit of the movable unit and the driven side magnetic unit of the polishing processing unit each have a fixed magnetic pole. When the movable unit rotates, both the driving side magnetic unit and the driven side magnetic unit are repelled and attracted by magnetic force, and as a result, the polishing processing unit rotates to follow the rotation of the movable unit. At that time, the rotation axis of the polishing processing unit is a position that passes through the polishing processing unit, and the polishing processing unit rotates while remaining at a specific location on the surface of the object, and polishes the surface of that specific location. As a result, the surface of the object can be locally polished.

[0008] In some embodiments, a control unit may be provided that can control the polishing property of the polishing processing unit that contacts the object by controlling at least one of the rotation speed and the rotation time of the movable part. The polishing property means the polishing strength and the polishing time. The polishing strength and the polishing time can be controlled by controlling the rotation speed or the rotation time of the movable part. As a result, polishing according to the condition of the surface of the object can be achieved.

[0009] In some embodiments, the polishing apparatus may further include a position adjustment unit that movably holds the movable unit, and a suction force control unit that can control the polishing property of the polishing unit that contacts the object by controlling the distance from the polishing unit to the movable unit via the position adjustment unit. The distance from the polishing unit to the movable unit can be controlled by the suction force control unit. As a result, the force with which the polishing unit contacts the object is controlled, and the polishing strength can be controlled.

[0010] In some embodiments, the drive unit includes a drive shaft connected to the movable unit, the drive shaft being disposed on and extending along the axis of rotation of the polishing unit, the axis of rotation of the polishing unit extending substantially across the surface of the object, such that the polishing unit rotates in a specific position, e.g., like a top, which is advantageous for polishing flat surfaces.

[0011] In some embodiments, the drive unit includes a drive shaft connected to the movable unit, and the rotation axis of the drive shaft and the rotation axis of the polishing unit extend parallel to each other, and the movable unit may be arranged side by side with respect to the polishing unit in a direction perpendicular to the rotation axis of the polishing unit. The polishing unit is installed so as to be in contact with the inner surface of the object, and the movable unit is arranged near the outer surface. When the movable unit is rotated in this state, the polishing unit rotates as if rolling on the inner surface to polish it, which is advantageous for polishing curved surfaces.

[0012] In some embodiments, the driven magnetic part has one end where a magnetic pole is fixed and which is attracted to the driving magnetic part, and the other end opposite to the one end, and the polishing processing part has a polishing part fixed to the one end and a magnetic holder part fixed to the other end. The holder part functions as a yoke, which is advantageous in increasing the magnetic force of the driven magnetic part. Effect of the Invention

[0013] According to some aspects of the present disclosure, the surface of an object can be locally polished. [Brief description of the drawings]

[0014] [Figure 1] FIG. 1 is a front view showing a first surface treatment apparatus according to an example of the present disclosure. [Diagram 2] FIG. 2 shows an example of the first surface treatment device, where (a) is a side view and (b) is a schematic view corresponding to (a). [Diagram 3] FIG. 3 shows a magnetic tool, in which (a) is a perspective view and (b) is a cross-sectional view taken along line bb in (a). [Figure 4] FIG. 4 is a side view illustrating a second surface treatment apparatus according to an example of the present disclosure. [Diagram 5] FIG. 5 is a schematic cross-sectional view showing a third surface treatment device according to an example of the present disclosure, where (a) is a cross-sectional view perpendicular to the rotation axis, and (b) is a cross-sectional view parallel to the rotation axis. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. In the description of the drawings, the same elements are given the same reference numerals, and duplicated description will be omitted.

[0016] First, the technical significance of the surface treatment device according to the present disclosure will be briefly explained. First, it is known that the factors that affect the amount of mechanical polishing are proportional to the pressure, relative motion, processing time, and coefficients derived from the processing conditions according to Preston's formula. In other words, it is necessary to generate pressure and relative motion on the target surface to be polished. Here, for example, when the target surface to be polished is an inner surface formed inside the space of the target object (hereinafter referred to as the "inner surface"), it is generally difficult to control the pressure and impart appropriate relative motion inside the target object, and it is difficult to form a finished surface by appropriate polishing. In contrast, according to the surface treatment device disclosed in the present disclosure, a small magnetic tool is placed inside the part, and pressure control and relative motion are indirectly imparted from the outside by utilizing the magnetic material permeation phenomenon, thereby enabling appropriate polishing.

[0017] 1 and 2 show a first surface treatment device 1A according to an example of the present disclosure. The surface treatment device 1A is a device that polishes and smoothes the surface of a non-magnetic or weakly magnetic object W. The non-magnetic or weakly magnetic object W may be a member made of a titanium alloy or a nickel alloy. The object W may also be an object with a complex shape having curved projections and recesses in a complex manner, and may be, for example, an object formed by additive manufacturing (also called "3D printing"). Additive manufacturing is generally effective in manufacturing parts with complex shapes, and can easily realize shapes that form spaces Sp inside.

[0018] According to the surface treatment device 1A of the present disclosure, it is possible to polish the inner surface Wa facing the space Sp inside the object W. The shape of the object W having the inner surface Wa may be a simple shape such as a straight pipe, a curved or bent pipe, a pipe that branches midway, a sphere or polyhedron, a frame or box-like shape having a desired three-dimensional shape, etc. In the present disclosure, a pipe-shaped object W will be described as an example.

[0019] The surface treatment device 1A includes a magnetic drive device 2 and a magnetic tool 3 (an example of a polishing processing device). The magnetic drive device 2 and the magnetic tool 3 are physically separate, but have a structure that allows them to be attracted to each other by magnetic force. Cooperation between the magnetic drive device 2 and the magnetic tool 3 enables polishing processing of the inner surface Wa of the target object W.

[0020] The magnetic drive device 2 includes an electric motor 21 (one example of a drive unit), a motor control unit 22 (one example of a control unit) that controls the drive of the electric motor 21, and a magnetic unit 23 (one example of a movable unit) that rotates by the drive of the electric motor 21. The electric motor 21 includes a rotating rotor, a stator arranged around the rotor, and a drive shaft unit 24 connected to the rotor. The motor control unit 22 includes an inverter device that controls the frequency and voltage of electricity input to the electric motor 21 to control the number of rotations and rotation time of the electric motor 21. The inverter device controls the drive of the electric motor 21 so that the rotation speed and rotation time become the designated values ​​input by the user's operation, for example. The motor control unit 22 may also be configured to include a CPU, a memory, etc., and to drive according to a predetermined program stored in the memory to control the drive of the electric motor 21.

[0021] The magnetic unit 23 includes a base portion 25 connected to the drive shaft portion 24 of the electric motor 21, and a drive-side magnetic portion 26 attached to the base portion 25. The base portion 25 is a disk-shaped member fixed to an end portion of the drive shaft portion 24. The base portion 25 includes one end portion 25a fixed to the drive shaft portion 24, and the other end portion 25b opposite to the one end portion 25a. The drive-side magnetic portion 26 is fixed to the other end portion 25b. The drive-side magnetic portion 26 has magnetic poles physically fixed thereto, and is arranged, for example, so that different magnetic poles are alternately arranged around the rotation axis L of the drive shaft portion 24.

[0022] The driving-side magnetic portion 26 according to one example of the present disclosure includes two (a plurality of) permanent magnets 27. As the permanent magnets 27, various magnets such as a neodymium magnet, a ferrite magnet, an alnico magnet, or the like can be used.

[0023] The two permanent magnets 27 are arranged side by side around the rotation axis L. The permanent magnet 27 is cylindrical (disk-shaped) and has two ends 27a, 27b. One end 27a of the permanent magnet 27 is fixed to the base portion 25, and the other end 27b (hereinafter referred to as the "attraction end 27b") is exposed so as to face the target object W. The two ends 27a, 27b of the permanent magnet 27 form different magnetic poles. In addition, the attraction ends 27b of the two permanent magnets 27 are fixed so as to form different magnetic poles, with one attraction end 27b being a north pole and the other attraction end 27b being a south pole (see FIG. 2(b)). The two permanent magnets 27 can attract the magnetic tool 3 by magnetic force.

[0024] In the example of the present disclosure, an example in which two permanent magnets 27 are arranged is described, but it is also possible to arrange an even number of permanent magnets 27, four or more, so that the attraction ends 27b of adjacent permanent magnets 27 have different magnetic poles. Also, the magnet may be a ring magnet in which different magnetic poles are alternately arranged in the circumferential direction, or a segment magnet arranged in a ring shape in which different magnetic poles are alternately arranged in the circumferential direction.

[0025] A magnetic material, that is, a material with high magnetic permeability, is used for base portion 25. Base portion 25 functions, for example, as a yoke that forms a magnetic circuit between itself and permanent magnet 27. By arranging base portion 25 on the opposite side of attraction end portion 27b, leakage of magnetic flux into the atmosphere can be prevented and the magnetic flux can be concentrated toward attraction end portion 27b.

[0026] The magnetic tool 3 is disposed so as to be in contact with the inner surface Wa of the object W. As shown in FIG. 3, the magnetic tool 3 includes a holder part 31, a driven-side magnetic part 32 fixed on the holder part 31, and an abrasive cloth 33 disposed so as to sandwich the driven-side magnetic part 32 between the holder part 31 and the driven-side magnetic part 32 and fixed to the driven-side magnetic part 32. The abrasive cloth 33 is an example of the abrasive part. The abrasive part is not limited to the abrasive cloth 33, and a wide variety of members can be used that can move relative to the inner surface Wa (an example of a surface) of the object W (an example of an object) to abrad- ate the inner surface Wa and form a smooth finished surface.

[0027] The holder part 31 is, for example, a disk-shaped member, and the driven-side magnetic part 32 is fixed to one surface. When the driven-side magnetic part 32 is used as a reference, the holder part 31 is arranged so as to be on the opposite side of the polishing cloth 33 with respect to the driven-side magnetic part 32. A magnetic material, that is, a material with high magnetic permeability, is used for the holder part 31. The holder part 31 functions, for example, as a yoke that forms a magnetic circuit with the driven-side magnetic part 32. By arranging the holder part 31 on the opposite side of the polishing cloth 33, it is possible to prevent leakage of magnetic flux into the atmosphere and concentrate the magnetic flux toward the polishing cloth 33 side.

[0028] The driven-side magnetic portion 32 according to one example of the present disclosure includes two (plural) permanent magnets 34. The two permanent magnets 34 are arranged side by side around the rotation axis L passing through the center of the holder portion 31. As the permanent magnet 27, various magnets such as a neodymium magnet, a ferrite magnet, an alnico magnet, etc. can be used.

[0029] The permanent magnet 34 is cylindrical (disk-shaped) and has two ends 34a, 34b. One end 34a of the permanent magnet 34 is fixed to the holder part 31, and the other end 34b (hereinafter referred to as the "attracted end 34b") is fixed to the polishing cloth 33. The two ends 34a, 34b of the permanent magnet 34 form different magnetic poles. In addition, the attracted ends 34b of the two permanent magnets 34 are fixed so as to form different magnetic poles, with one attracted end 34b being a north pole and the other attracted end 34b being a south pole.

[0030] In the example of the present disclosure, an example in which two permanent magnets 34 are arranged is described, but it is also possible to arrange an even number of permanent magnets 34, four or more, so that the attracted ends 34b of adjacent permanent magnets 34 have different magnetic poles. Also, the magnet may be a ring magnet in which different magnetic poles are alternately arranged in the circumferential direction, or a segment magnet arranged in a ring shape in which different magnetic poles are alternately arranged in the circumferential direction.

[0031] The grain size of the polishing cloth 33 can be selected according to the surface roughness of the object to be polished, and the degree of polishing can be adjusted. For example, in the case of an object with a rough surface such as the object W of the present disclosure, a polishing cloth 33 using a coarse grain abrasive can be used, and in the case of a relatively smooth object such as a casting, a polishing cloth 33 using a fine grain abrasive can be used. In addition, by configuring the polishing cloth 33 to be detachable from the driven side magnetic part 32, it becomes easy to adjust the polishing cloth 33 and to replace the polishing cloth 33 when it is worn out.

[0032] Next, the action and effect of the surface treatment device 1A will be described with reference to Fig. 2. The surface treatment device 1A includes a magnetic drive device 2 and a magnetic tool 3, and utilizes the magnetic material permeation phenomenon to indirectly magnetically drive the magnetic tool 3, thereby causing relative movement between the magnetic tool 3 and the object W, thereby achieving the desired polishing process.

[0033] Specifically, the magnetic tool 3 is disposed so as to be in contact with the inner surface Wa of the target object W. Meanwhile, the magnetic unit 23 is disposed near the outer surface (hereinafter referred to as the "outer surface Wb") on the opposite side of the target object W with respect to the magnetic tool 3. This "near" includes not only a state in which the magnetic unit 23 is in contact with the outer surface Wb, but also a state in which the magnetic unit 23 is disposed at a position away from the outer surface Wb of the target object W and capable of attracting the magnetic tool 3 via magnetic force.

[0034] The magnetic tool 3 is attracted to the magnetic unit 23 and is in close contact with the inner surface Wa of the object W. This close contact can provide a processing force that contributes to polishing. In this state, the electric motor 21 rotates the magnetic unit 23. The driving side magnetic part 26 of the magnetic unit 23 and the driven side magnetic part 32 of the magnetic tool 3 each have a fixed magnetic pole. When the magnetic unit 23 rotates, both repulsion and attraction due to magnetic forces act on the driving side magnetic part 26 and the driven side magnetic part 32, and as a result, the magnetic tool 3 rotates to follow the rotation of the magnetic unit 23. On the other hand, the object W is fixed to remain at a predetermined position, and the magnetic tool 3 moves relative to the object W to polish the inner surface Wa of the object W. Furthermore, the rotation axis L of the magnetic tool 3 is a position that passes through the magnetic tool 3 and substantially extends in the normal direction of the inner surface Wa to which the magnetic tool 3 is in close contact. That is, the magnetic tool 3 rotates while remaining at a specific location on the inner surface Wa, and polishes the specific location in a narrow range. As a result, the inner surface Wa of the object W can be polished locally.

[0035] In addition, the magnetic tool 3 can be moved by scanning the magnetic unit 23 along the outer surface Wb of the object W. As a result, even a wide area of ​​the inner surface Wa of the object W to be polished can be polished.

[0036] In contrast to the polishing method using the surface treatment device 1A of the present disclosure, methods for polishing the inner surface of an object include inner surface grinding, honing, electrolytic polishing, fluid polishing, and abrasive flow machining. However, inner surface grinding, honing, and electrolytic polishing are disadvantageous for localized polishing, and are limited to polishing inner surfaces of simple shapes. On the other hand, fluid polishing and abrasive flow machining have few restrictions on shape and inner diameter, but are not suitable for rough surfaces such as objects because it is difficult to remove long wavelength undulations. In addition, barrel polishing and electrochemical methods have been proposed as means for surface treatment of objects, but it is difficult to control the amount of polishing, and they have not shown sufficient processing ability for inner surfaces. In addition, there are problems with mass production application in terms of long processing time and high environmental load due to waste liquid. Furthermore, it is difficult to implement measures such as combining a robot arm unit with a magnetic tool with these methods, and they are also considered to be unsuitable for automation.

[0037] Compared to these methods, the surface treatment device 1A of the present disclosure can locally polish the surface of the object W, and can also polish a rough surface such as that of the object W to form a desired finished surface. Furthermore, it can also be applied to a robot arm like the second surface treatment device 1B described below, which is advantageous for automation.

[0038] The surface treatment device 1A of the present disclosure also includes a motor control unit 22 that controls the driving of the electric motor 21. The motor control unit 22 controls at least one of the rotation speed and rotation time of the magnetic unit 23. The motor control unit 22 can control the abrasiveness of the magnetic tool 3 that contacts the object W by controlling the rotation speed and rotation time of the magnetic unit 23. In the present disclosure, abrasiveness means the polishing strength and polishing time. The polishing strength and polishing time can be controlled by controlling the rotation speed or rotation time of the magnetic unit 23. As a result, polishing according to the condition of the surface (e.g., inner surface Wa) of the object W is possible.

[0039] In one example of the present disclosure, the drive shaft 24 of the electric motor 21 is disposed on the rotation axis L of the magnetic tool 3 and extends along the rotation axis L. Specifically, the rotation axis L of the magnetic tool 3 extends so as to substantially intersect (orthogonally) with the inner surface Wa of the object W. As a result, the magnetic tool 3 rotates, for example, like a top at a specific position (narrow range) of the inner surface Wa, which is advantageous for polishing a flat surface.

[0040] In one example of the present disclosure, the magnetic tool 3 includes a holder portion 31 that functions as a yoke. As a result, this is advantageous in increasing the magnetic force of the driven magnetic portion 32.

[0041] Next, a second surface treatment device 1B according to another example of the present disclosure will be described with reference to Fig. 4. The surface treatment device 1B has elements and structures similar to those of the first surface treatment device 1A. In the following description, differences will be mainly described, and similar elements and structures will be denoted by the same reference numerals and detailed description will be omitted.

[0042] The surface treatment device 1B includes a magnetic drive device 2 equipped with a magnetic unit 23, and a magnetic tool 3 capable of polishing the inner surface Wa of the object W by moving relative to the object W. The surface treatment device 1B also includes a robot arm section 5 capable of gripping the magnetic drive device 2 and holding and moving the magnetic drive device 2, and a control device 6 that controls the movement of the robot arm section 5. The control device 6 is controllably connected to a motor control section 22 of the magnetic drive device 2. The robot arm section 5 is an example of a position adjustment section that movably holds the magnetic unit 23, and the control device 6 is an example of a suction force control section.

[0043] The robot arm unit 5 includes a plurality of link units 51 and a joint unit 52 that connects the link units 51 to each other so that the link units 51 can tilt and rotate. The tip of the robot arm unit 5 is fixed to a connecting unit 29 provided on the magnetic drive device 2. The joint unit 52 is equipped with an actuator, a reducer, an encoder, a transmission mechanism, etc. for moving the link units 51, and is driven by receiving a control signal from the control device 6.

[0044] The control device 6 is connected to the robot arm unit 5 and the motor control unit 22 at least in a wired or wireless manner, and is configured to be able to transmit and receive control signals. The control device 6 includes a CPU, memory, etc., and operates according to a predetermined program stored in the memory to drive and control the actuators of the robot arm unit 5, etc. The control device 6 also transmits and receives control signals to and from the motor control unit 22 of the magnetic drive device 2, and is also able to control the rotation speed and rotation time of the electric motor 21.

[0045] The surface treatment apparatus 1B has the same elements and structure as the first surface treatment apparatus 1A, and exerts the same functions and effects as the first surface treatment apparatus 1A described above.

[0046] Furthermore, according to the surface treatment apparatus 1B, the robot arm unit 5 can move the magnetic drive device 2 to a desired position, so that the control device 6 can control the distance D from the magnetic tool 3 to the magnetic unit 23. In other words, the surface treatment apparatus 1B can control the abrasiveness of the magnetic tool 3 in contact with the object W by controlling at least one of the distance D from the magnetic tool 3 to the magnetic unit 23, the rotation speed of the magnetic unit 23, and the rotation time.

[0047] In the surface treatment device 1B, the control device 6 controls the distance D between the magnetic tool 3 and the magnetic unit 23, thereby controlling the attraction force of the magnetic unit 23 to the magnetic tool 3. As a result, the force with which the magnetic tool 3 adheres to the inner surface Wa of the object W is controlled, and the polishing strength can be controlled. In addition, the control device 6 controls the rotation speed or rotation time of the magnetic unit 23 via the motor control device 22 by sending a control signal to the motor control device 22 of the magnetic drive device 2. Controlling the rotation speed or rotation time of the magnetic unit 23 makes it possible to control the polishing time by the magnetic tool 3, and as a result, polishing according to the condition of the inner surface Wa of the object W becomes possible.

[0048] In addition, according to the surface treatment device 1B, the robot arm unit 5 can automate the scanning of the magnetic drive device 2 along the outer surface Wb of the object W, and the magnetic tool 3 can be moved along the inner surface Wa of the object W, making it possible to polish a wide range of the inner surface Wa.

[0049] Next, a third surface treatment device 1C according to another example of the present disclosure will be described with reference to Fig. 5. The surface treatment device 1C has elements and structures similar to those of the first surface treatment device 1A and the second surface treatment device 1B. In the following description, differences will be mainly described, and similar elements and structures will be denoted by the same reference numerals and detailed description will be omitted.

[0050] The surface treatment apparatus 1C includes a magnetic drive device 7 and a magnetic tool 8. The magnetic drive device 7 includes an electric motor 71 (an example of a drive unit), a motor control unit 72 that controls the drive of the electric motor 71, and a magnetic unit 73 (movable unit) that rotates by the drive of the electric motor 71. The electric motor 71 includes a rotating rotor, a stator arranged around the rotor, and a drive shaft unit 74 connected to the rotor. The motor control unit 72 includes an inverter device that controls the frequency and voltage of electricity input to the electric motor 71 to control the rotation speed and rotation time of the electric motor 71.

[0051] The magnetic unit 73 includes a driving-side magnetic portion 76 attached to a driving shaft portion 74 of the electric motor 71. The driving-side magnetic portion 76 has magnetic poles that are physically fixed, and is arranged, for example, such that different magnetic poles are alternately arranged around the rotation axis La of the driving shaft portion 74.

[0052] The driving-side magnetic part 76 according to one example of the present disclosure includes a cylindrical permanent magnet 77 fixed to the circumferential surface of the driving shaft part 74. The outer circumferential surface of the permanent magnet 77 includes a plurality of regions divided in the circumferential direction as magnetic poles, and the plurality of regions are arranged so that different magnetic poles (N poles and S poles) are arranged alternately. The driving-side magnetic part 76 is arranged so that the rotation axis La extends in the tangential direction of the outer surface Wb of the object W. As a result, the driving-side magnetic part 76 rotates as if rolling on the outer surface Wb of the object W. Note that the driving-side magnetic part 76 can be any of various magnets formed with different magnetic poles arranged alternately in the circumferential direction, and may be a segment magnet or the like.

[0053] The magnetic tool 8 is disposed so as to be in contact with the inner surface Wa of the object W. The magnetic tool 8 includes a shaft portion 81 which is a cylindrical core portion, a driven side magnetic portion 82 fixed to the periphery of the shaft portion 81, and an abrasive cloth 83 fixed to the periphery of the shaft portion 81. For example, a magnetic material, that is, a material with high magnetic permeability, can be used for the shaft portion 81.

[0054] The driven-side magnetic part 82 according to an example of the present disclosure includes a cylindrical permanent magnet 87. The permanent magnet 87 is arranged around a rotation axis Lb passing through the center of the shaft part 81. The outer peripheral surface of the permanent magnet 87 includes a plurality of regions divided in the circumferential direction as magnetic poles, and the plurality of regions are arranged so that different magnetic poles (N poles and S poles) are arranged alternately. The driven-side magnetic part 82 is arranged so that the rotation axis Lb extends in the tangential direction of the inner surface Wa of the object W. As a result, the driven-side magnetic part 82 rotates as if rolling on the inner surface Wa of the object W. The driven-side magnetic part 82 can be any of various magnets formed with different magnetic poles arranged alternately in the circumferential direction, and may be a segment magnet or the like.

[0055] The surface treatment device 1C has elements and structures similar to those of the first surface treatment device 1A or the second surface treatment device 1B, and exhibits the same functions and effects as those of the first surface treatment device 1A or the second surface treatment device 1B described above.

[0056] Furthermore, the electric motor 71 of the surface treatment device 1C includes a drive shaft 74 connected to the magnetic unit 73, and the rotation axis La of the drive shaft 74 and the rotation axis Lb of the magnetic tool 8 extend parallel to each other. The magnetic unit 73 is arranged in a lateral direction perpendicular to the rotation axis Lb with respect to the magnetic tool 8. In the surface treatment device 1C, the magnetic tool 8 is installed so as to be in contact with the inner surface Wa of the object W, and the magnetic unit 73 is arranged in the vicinity of the outer surface Wb of the object W. When the magnetic unit 73 is rotated in this state, the magnetic tool 8 rotates as if rolling on the inner surface Wa to perform polishing, which is advantageous for polishing curved surfaces.

[0057] The present disclosure is not limited to the above-mentioned embodiment. For example, in the above-mentioned embodiment, the object is described as an example of the object, but the object is not limited to the object, and includes non-magnetic or weakly magnetic products that require surface polishing. In addition, the polishing part is not limited to the inner surface, and may be, for example, a wall-shaped object, with a polishing processing part disposed on one side thereof and a movable part disposed on the other side thereof for polishing. [Explanation of symbols]

[0058] 1A First surface treatment device 1B Second surface treatment device 1C 3rd surface treatment device 3 Magnetic tools (polishing processing section) 5 Robot arm section (position adjustment section) 6 Control device (suction force control unit) 8 magnetic tools 31 Holder section 32 Driven side magnetic part 33 Polishing cloth (polishing part) 34a end (the other end of the driven magnetic part) 34b Attracted end (one end of the driven magnetic part) 21 Electric motor (drive unit) 22 Motor control unit (control unit) 23 Magnetic unit (moving part) 24 Drive shaft 26 Drive side magnetic part 74 Drive shaft 76 Drive side magnetic part 82 Driven side magnetic part L Rotation axis La Rotation axis of the drive shaft Lb Rotation axis of magnetic tool W Object

Claims

1. A surface treatment device for polishing the surface of a non-magnetic or weakly magnetic object, comprising: a polishing processing section including a driven magnetic section having a fixed magnetic pole and capable of polishing the surface by moving relative to the object; a movable part including a driving magnetic part having a fixed magnetic pole and capable of attracting the driven magnetic part by a magnetic force; a drive unit that rotates the movable unit to rotate the polishing processing unit about a rotation axis passing through the polishing processing unit; a control unit capable of controlling at least one of a rotation speed of the movable unit and a rotation time of the movable unit via the drive unit to control abrasiveness of the polishing processing unit that contacts the object; a position adjustment unit that movably holds the movable unit; a suction force control unit that is capable of controlling the abrasiveness of the polishing processing unit in contact with the object by controlling the distance from the polishing processing unit to the movable unit via the position adjustment unit.

2. A surface treatment device for polishing a surface of a non-magnetic or weakly magnetic object, comprising: a polishing processing section including a driven magnetic section having a fixed magnetic pole and capable of polishing the surface by moving relative to the object; a movable part including a driving magnetic part having a fixed magnetic pole and capable of attracting the driven magnetic part by a magnetic force; A drive unit that rotates the movable unit to rotate the polishing processing unit about a rotation axis passing through the polishing processing unit, The drive unit includes a drive shaft unit connected to the movable unit, The drive shaft portion is disposed on the rotation axis of the polishing processing portion and extends along the rotation axis.

3. A surface treatment apparatus for polishing a surface of a non-magnetic or weakly magnetic object, comprising: a polishing processing section including a driven magnetic section having a fixed magnetic pole and capable of polishing the surface by moving relative to the object; a movable part including a driving magnetic part having a fixed magnetic pole and capable of attracting the driven magnetic part by a magnetic force; A drive unit that rotates the movable unit to rotate the polishing processing unit about a rotation axis passing through the polishing processing unit, The drive unit includes a drive shaft unit connected to the movable unit, The rotation axis of the drive shaft portion and the rotation axis of the polishing processing portion extend in parallel, The movable portion is arranged side by side with respect to the polishing processing portion in a direction perpendicular to the rotation axis of the polishing processing portion.

4. A surface treatment apparatus for polishing a surface of a non-magnetic or weakly magnetic object, comprising: a polishing processing section including a driven magnetic section having a fixed magnetic pole and capable of polishing the surface by moving relative to the object; a movable part including a driving magnetic part having a fixed magnetic pole and capable of attracting the driven magnetic part by a magnetic force; A drive unit that rotates the movable unit to rotate the polishing processing unit about a rotation axis passing through the polishing processing unit, the driven-side magnetic portion has one end portion having a fixed magnetic pole and being attracted to the driving-side magnetic portion, and the other end portion being opposite to the one end portion; The polishing processing section includes a polishing section fixed to the one end section, and a holder section fixed to the other end section and having magnetic properties.

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