JP2006255840A - Surface treatment device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a surface treatment device capable of restraining the generation of heat in a magnetic field generating part even if machining for a machining object is performed for a long time to stably perform machining for the machining object over a long period of time. <P>SOLUTION: This surface treatment device 1 includes a storing vessel 9, an electromagnetic coil 8 and a cooling part 11. The storing vessel 9 is formed cylindrical to store both magnetic abrasive grains 65 and the machining object 2. The electromagnetic coil 8 generates a rotary magnetic field in the storing vessel 9, thereby revolving and rotating the magnetic abrasive grains to collide with the outer surface of the machining object 2. A space is formed between the inner peripheral surface of the electromagnetic coil 8 and the outer peripheral surface of the storing vessel 9. The cooling part 11 guides a pressurized gas from a pressurized gas supply source 67 to the space using a nozzle 69 to cool the electromagnetic coil 8. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a surface treatment apparatus for roughening the surface of a workpiece by causing magnetic abrasive grains to collide with the outer surface of the workpiece formed in a cylindrical shape, a columnar shape, or a plate shape, for example. .

  In order to roughen the outer surface of the workpiece formed in a cylindrical, columnar, or plate shape, magnetic abrasive grains and the workpiece are enclosed in a storage tank, and an electromagnetic coil as a magnetic field generator is provided. By using the electromagnetic force acting between the rotating magnetic field and the magnetic abrasive grains to generate a rotating magnetic field that moves the magnetic abrasive grains, the magnetic abrasive grains are randomly excited and collide with the workpiece. 2. Description of the Related Art A surface treatment apparatus (for example, see Patent Documents 1 to 4) that roughens an outer surface is known.

This type of surface treatment apparatus is known to have higher processing efficiency than a sand blasting apparatus or a shot blasting apparatus in which abrasive grains are ejected by air pressure or water pressure and the abrasive grains collide with a workpiece.
JP 2003-305634 A JP 2001-138207 A Japanese Patent No. 3486221 JP 61-38862 A

  However, the surface treatment apparatuses described in Patent Documents 1 to 4 described above are still in the development stage, and those that enable surface treatment of a large amount of workpieces have not been put into practical use.

  Since the surface treatment apparatus described in Patent Documents 1 to 4 described above generates a rotating magnetic field in the storage tank using the electromagnetic coil, when the workpiece is processed for a long time, the electrical treatment of the electromagnetic coil itself is performed. The electromagnetic coil generates heat due to a large resistance. As described above, when the workpiece is processed for a long time, in the conventional surface treatment apparatus, the temperature of the electromagnetic coil rises and the electrical resistance value of the electromagnetic coil changes, and the rotational magnetic field described above is changed. It becomes difficult to keep strength, etc. constant. That is, in the above-described conventional surface treatment apparatus, it is difficult to roughen the outer surface of the workpiece to a desired roughness when the workpiece is processed for a long time.

  Since the surface treatment apparatus described above is still in the development stage, it is not considered to operate continuously for a long time, and since the processing interval of the processing object is long, the heating of the electromagnetic coil described above becomes a big problem. It never happened.

  However, the above-described surface treatment apparatus cannot ignore the above-described problems when performing continuous machining of a workpiece for a long time as a mass production apparatus of the workpiece. The surface treatment apparatus described above is desired to be able to suppress the heat generation of the electromagnetic coil even when the workpiece is continuously processed for a long time.

  The present invention has been made in view of the above background, and even when a workpiece is processed for a long time, the heat generation of the magnetic field generation unit is suppressed and the workpiece can be processed stably for a long time. An object of the present invention is to provide a surface treatment apparatus capable of being performed.

  In order to solve the above-described problems and achieve the object, the surface treatment apparatus according to claim 1 moves the magnetic abrasive grains into a storage tank that stores a workpiece and magnetic abrasive grains, and the storage tank. A surface treatment apparatus including a magnetic field generation unit that generates a rotating magnetic field and causes the magnetic abrasive grains to collide with the workpiece by the rotating magnetic field, and further includes a cooling unit that cools the magnetic field generating unit. It is said.

  The surface treatment apparatus according to a second aspect is the surface treatment apparatus according to the first aspect, further comprising holding means for holding the object to be processed at the center of the storage tank.

  A surface treatment apparatus according to a third aspect is the surface treatment apparatus according to the second aspect, wherein the magnetic field generation unit moves the magnetic abrasive grains on the outer periphery of the workpiece.

  The surface treatment apparatus according to claim 4 is the surface treatment apparatus according to claim 3, further comprising a rotating means for rotating the object to be processed around an axis parallel to the longitudinal direction of the storage tank. It is said.

  The surface treatment apparatus according to claim 5 is the surface treatment apparatus according to any one of claims 1 to 4, wherein the cooling means includes a pressurized gas supply source and the pressurized gas supply source. And a nozzle for spraying the pressurized gas from the magnetic field generation unit.

  The surface treatment apparatus according to claim 6 is the surface treatment apparatus according to claim 5, wherein a space is provided between the magnetic field generation unit and the storage tank, and the cooling unit guides the gas into the space. It is characterized by doing so.

  The surface treatment apparatus according to claim 7 is the surface treatment apparatus according to claim 5, wherein the magnetic field generation unit projects inward from a cylindrical main body and an inner peripheral surface of the main body. And a radiating fin.

  The surface treatment apparatus according to claim 8 is the surface treatment apparatus according to claim 5, wherein the magnetic field generation unit includes a main body part formed in a cylindrical shape and heat dissipation protruding outward from an outer peripheral surface of the main body part. And fins.

  The surface treatment apparatus according to claim 9 is characterized in that, in the surface treatment apparatus according to claim 7 or claim 8, the cooling means blows a pressurized gas to the radiating fins. .

  In the conventional surface treatment apparatus, the electromagnetic coil as the magnetic field generating unit and the storage tank for storing the workpiece are in close contact with each other. Therefore, it is difficult to dissipate the heat generated in the electromagnetic coil. The coil temperature exceeds the allowable temperature. However, according to the surface treatment apparatus of the first aspect, since the cooling means cools the magnetic field generation unit, the magnetic field generation unit generates heat even when the workpiece is processed for a long time. The temperature rise of the magnetic field generator can be suppressed. For this reason, even if it processes a process target object for a long time, it can suppress that the electrical resistance value of a magnetic field generation | occurrence | production part changes, and can process a process target object stably over a long time. . That is, the surface treatment apparatus according to claim 1 can perform a certain roughening for a long time.

  According to the surface treatment apparatus of the second aspect, since the workpiece is held at the center of the storage tank, the magnetic abrasive grains can collide with the outer surface of the workpiece substantially uniformly. Therefore, the outer surface of the workpiece can be processed uniformly.

  According to the surface treatment apparatus of the third aspect, the magnetic abrasive grains move on the outer periphery of the workpiece, so that the magnetic abrasive grains can be reliably collided with the outer surface of the workpiece, The object can be reliably processed.

  According to the surface treatment apparatus of the fourth aspect, since the workpiece is rotated, the magnetic abrasive grains can be uniformly collided with the outer surface of the workpiece. Therefore, the outer surface of the object to be processed can be processed more uniformly.

  According to the surface treatment apparatus of the fifth aspect, since the cooling means includes the pressurized gas supply source and the nozzle, the magnetic field generator can be efficiently cooled.

  According to the surface treatment apparatus of the sixth aspect, since the space is provided between the magnetic field generation unit and the storage tank and the gas is guided into the space, the gas passing through the space takes the heat of the magnetic field generation unit. It will be. For this reason, a magnetic field generation | occurrence | production part can be cooled more efficiently.

  According to the surface treatment apparatus of the seventh aspect, since the heat radiating fin is provided, the heat of the magnetic field generation unit is radiated to the outside through the heat radiating fin. For this reason, a magnetic field generation | occurrence | production part can be cooled more efficiently.

  According to the surface treatment apparatus of the eighth aspect, since the heat radiating fin is provided, the heat of the magnetic field generation unit is radiated to the outside through the heat radiating fin. For this reason, a magnetic field generation | occurrence | production part can be cooled more efficiently.

  According to the surface treatment apparatus of the ninth aspect, since the gas is blown to the heat radiating fin, the heat of the magnetic field generation unit is radiated from the outside through the heat radiating fin. For this reason, a magnetic field generation | occurrence | production part can be cooled much more efficiently.

  Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a side view showing a partial cross section of the structure of the surface treatment apparatus according to the first embodiment of the present invention. FIG. 2 is a side view showing a state during operation of the surface treatment apparatus shown in FIG.

  The surface treatment apparatus 1 roughens the outer surface of a cylindrical workpiece 2 (shown in FIG. 1) such as a developing roller or a charging roller used in an image forming apparatus such as a copying machine, a facsimile machine, or a printer. Device. The outer diameter of the workpiece 2 is preferably about 17 mm to 18 mm. The length of the workpiece 2 in the direction of the axis P is desirably about 300 mm to 350 mm.

  As shown in FIG. 1, the surface treatment apparatus 1 includes a base 3, a fixed holding unit 4, an electromagnetic coil support unit 5, a movement holding unit 6, an electromagnetic coil 8 as a magnetic field generation unit, and a storage tank 9. And a cooling unit 11 as a cooling means.

  The base 3 is formed in a flat plate shape and is installed on a factory floor or table. The upper surface of the base 3 is kept parallel to the horizontal direction. The planar shape of the base 3 is formed in a rectangular shape.

  The fixed holding portion 4 includes a plurality of support columns 12 erected from one end portion in the longitudinal direction of the base 3 (hereinafter indicated by an arrow X), a holding base 13, a cylindrical holding member 15, and a driven shaft 14. Yes.

  The amount of protrusion of the support 12 from the base 3 can be changed. The column 12 changes the height of the holding base 13 by changing the amount of protrusion from the base 3.

  The holding base 13 is formed in a flat plate shape and is attached to the upper end of the support column 12. The cylindrical holding member 15 is formed in a cylindrical shape and is installed on the holding base 13. The cylindrical holding member 15 is arranged so that its axis is parallel to the horizontal direction. The cylindrical holding member 15 has an axis arranged in parallel with the arrow X. The cylindrical holding member 15 accommodates one end portion 9a of the accommodating tank 9 inside.

  The driven shaft 14 is formed in a cylindrical shape. The driven shaft 14 is arranged such that its axis is parallel to both the horizontal direction and the arrow X. The driven shaft 14 is rotatably provided around the axis of the cylindrical holding member 15 by a bearing 16. A tapered portion 17 is provided at the end of the driven shaft 14 near the center of the base 3 so as to gradually taper the driven shaft 14 toward the center of the base 3. The driven shaft 14 is arranged coaxially with the cylindrical holding member 15.

  In the fixed holding portion 4, the height of the holding base 13 is adjusted by the support 12 so that the driven shaft 14 and the cylindrical holding member 15 are coaxial with the storage tank 9 and a hollow holding member 32 described later. The fixed holding portion 4 is configured so that the tapered portion 17 of the driven shaft 14 enters the one end portion 32 a of the hollow holding member 32 to support the one end portion 32 a of the hollow holding member 32 and also into the cylindrical holding member 15. One end 9 a of the storage tank 9 is received and the one end 9 a of the storage tank 9 is supported. Thus, the fixed holding portion 4 having the above-described configuration holds the one end portion 9 a of the storage tank 9 and the one end portion 32 a of the hollow holding member 32.

  The electromagnetic coil support 5 is arranged in parallel with the fixed holding part 4 along the arrow X, and is arranged closer to the center of the base 3 than the fixed holding part 4. The electromagnetic coil support 5 includes a pair of support legs 18. Each of the support legs 18 includes a pair of support columns 19. One end portions of the support columns 19 are connected to each other. The support column 19 is erected from the base 3. The support leg 18 has a pair of support columns 19 and has a V shape. The pair of support legs 18 are arranged along the arrow X at intervals. The electromagnetic coil support 5 supports the electromagnetic coil 8 on the upper end of the support 19 of each support leg 18.

  The movement holding unit 6 is arranged in parallel with the electromagnetic coil support 5 along the arrow X, and is disposed closer to the other end of the base 3 than the electromagnetic coil support 5. The movable holding unit 6 includes a linear guide (not shown), a holding base 23, an actuator 24, and a bearing rotating unit 27.

  The linear guide includes a rail and a slider. The rail is installed on the base 3. The rail is formed in a straight line, and its longitudinal direction is arranged in parallel with the arrow X, that is, the longitudinal direction of the base 3. The slider is supported by the rail so as to be movable in the longitudinal direction of the rail, that is, along the arrow X.

  The holding base 23 is formed in a flat plate shape and is mounted on the above-described linear guide slider (not shown). The upper surface of the holding base 23 is arranged in parallel with the horizontal direction. The actuator 24 is attached to the base 3 and slides the holding base 23 described above along the arrow X.

  The bearing rotating unit 27 includes a plurality of support columns 28, a cylindrical holding member 29, a hollow holding member 32, a driving motor 33 as a rotating means, and a chuck cylinder (not shown).

  The plurality of support columns 28 are erected from the holding base 23. The cylindrical holding member 29 is formed in a cylindrical shape and is attached to the upper end of the support column 28. The cylindrical holding member 29 is arranged in a state in which its axis is parallel to both the horizontal direction and the arrow X. The cylindrical holding member 29 is disposed coaxially with both the driven shaft 14 and the cylindrical holding member 15.

  The hollow holding member 32 is formed in a cylindrical shape, and is supported by the cylindrical holding member 29 by a bearing 31 so as to be rotatable around an axis. The hollow holding member 32 has its axis arranged coaxially with the arrow X described above, that is, the axis of the cylindrical holding member 15 of the fixed holding unit 4. The hollow holding member 32 is shaped to protrude from the holding base 23 toward the fixed holding portion 4 so that the one end portion 32 a is located in the storage tank 9, and the other end portion 32 c is located on the holding base 23. Arranged in the state. The hollow holding member 32 is arranged coaxially with the driven shaft 14. The hollow holding member 32 is passed through the cylindrical workpiece 2 as shown in FIG. Further, a pulley 35 is fixed to the other end portion 32 c positioned on the holding base 23 of the hollow holding member 32. The pulley 35 is disposed coaxially with the hollow holding member 32.

  In addition, a step 34 is provided in the central portion 32b of the hollow holding member 32, which is positioned in the storage tank 9, and the outer diameter of the hollow holding member 32 is gradually reduced from the other end 32c toward the one end 32a. It has been.

  The drive motor 33 is installed on the holding base 23, and a pulley 36 is attached to an output shaft thereof. The axis of the output shaft of the drive motor 33 is parallel to the arrow X. An endless timing belt 37 is wound around the pulleys 35 and 36 described above. The drive motor 33 rotates the hollow holding member 32 around the axis. The drive motor 33 rotates the hollow holding member 32 around the axis to rotate the workpiece 2 around the axis P parallel to the longitudinal direction of the storage tank 9.

  The chuck cylinder includes a cylinder main body installed on the holding base 23 and a chuck shaft slidably provided on the cylinder main body. The chuck shaft is formed in a cylindrical shape, and its longitudinal direction is arranged in parallel with the arrow X. The chuck shaft is accommodated in the hollow holding member 32 and is disposed coaxially with the hollow holding member 32. A pair of chuck claws 40 is attached to the chuck shaft.

  The pair of chuck claws 40 are attached to the chuck shaft so as to protrude from the outer peripheral surface of the chuck shaft in the outer peripheral direction of the chuck shaft. The chuck pawl 40 protrudes from the outer peripheral surface of the hollow holding member 32 toward the outer periphery of the hollow holding member 32. The chuck claw 40 is provided so that the amount of protrusion from the chuck shaft and the hollow holding member 32 can be changed. When the chuck shaft of the chuck cylinder shrinks in the direction in which the chuck shaft approaches the cylinder body, the amount of protrusion from the chuck shaft and the hollow holding member 32 increases.

  In the above-described chuck cylinder, the chuck shaft is reduced to the cylinder body, so that the chuck pawl 40 protrudes further toward the outer periphery of the chuck shaft, and the chuck pawl 40 protrudes from the outer peripheral surface of the hollow holding member 32. The chuck cylinder fixes the chuck shaft, the hollow holding member 32, and the workpiece 2 by sandwiching the workpiece 2 between the step 34 and the chuck pawl 40. At this time, of course, the chuck shaft, the hollow holding member 32, the workpiece 2 and the cylindrical member 50 described later, that is, the storage tank 9, are coaxial.

  The chuck cylinder and the chuck pawl 40 described above hold the workpiece 2 so as to be coaxial with the hollow holding member 32 and the storage tank 9. That is, the chuck cylinder and the chuck pawl 40 hold the workpiece 2 at the center of the storage tank 9. The above-mentioned chuck cylinder and chuck claw 40 constitute holding means described in the claims.

  The movement holding unit 6 having the above-described configuration moves the hollow holding member 32 and the like along the arrow X by the actuator 24, and the chuck cylinder and the chuck pawl 40 hold the workpiece 2 on the hollow holding member 32.

  As shown in FIG. 1, the electromagnetic coil 8 includes an outer skin 46 formed in a cylindrical shape and a plurality of coil portions 47 disposed in the outer skin 46, and is formed in an annular shape as a whole. The outer skin 46 and the plurality of coil portions 47 constitute the main body portion 45 of the electromagnetic coil 8 as a magnetic field generating portion described in the claims.

  The inner diameter of the electromagnetic coil 8 is larger than the outer diameter of the storage tank 9. That is, a space is formed between the inner peripheral surface of the electromagnetic coil 8 and the outer peripheral surface of the storage tank 9. In the present invention, it is desirable that a gap of about 5 mm to 15 mm is provided between the inner peripheral surface of the electromagnetic coil 8 and the outer peripheral surface of the storage tank 9 along these radial directions. The total length of the electromagnetic coil 8 in the axial direction is slightly shorter than the total length of the storage tank 9 in the axial direction.

  The outer skin 46 is made of a non-magnetic metal having conductivity such as an aluminum alloy. The shaft core, that is, the shaft core of the electromagnetic coil 8 itself is supported on the upper end of the support column 19 of the support leg 18 of the electromagnetic coil support portion 5 described above in a state parallel to the arrow X. Further, the outer skin 46, that is, the electromagnetic coil 8, is disposed coaxially with the hollow holding member 32, the driven shaft 14, the chuck shaft, and the like described above.

  The plurality of coil portions 47 are arranged in parallel along the circumferential direction of the outer skin 46, that is, the electromagnetic coil 8. In the illustrated example, 24 coil portions 47 are provided. The coil portion 47 includes a yoke (not shown) and a coil wound around the yoke. The yoke is made of a magnetic material and is fixed to the inner peripheral surface of the outer skin 46 by shrink fitting. The coil portion 47 is filled with synthetic resin or the like between them. A coil of each coil unit 47 is applied by a three-phase AC power supply 48 shown in FIG. The coils of the plurality of coil portions 47 are applied with power that is shifted from each other, and the coils of the plurality of coil portions 47 generate magnetic fields that are out of phase with each other. And the electromagnetic coil 8 produces | generates the magnetic field (rotating magnetic field) of the rotation direction around the axial center of this electromagnetic coil 8 formed by synthesize | combining these magnetic fields inside.

  The electromagnetic coil 8 described above is applied from a three-phase AC power supply 48 and generates a rotating magnetic field. And the electromagnetic coil 8 positions the below-mentioned magnetic abrasive grain 65 on the outer periphery of the workpiece 2 by the above-described rotating magnetic field, and places the magnetic abrasive grain 65 in the storage tank 9 and the axis P of the workpiece 2 (FIG. 1). Rotate (move) around (indicated by a dashed line). The shaft core P also forms the shaft core of the cylindrical member 50 and the longitudinal direction of the storage tank 9. The electromagnetic coil 8 causes the magnetic abrasive grains 65 to collide with the outer surface of the workpiece 2 by the rotating magnetic field described above.

  Further, an inverter 49 as a magnetic field changing unit is provided between the three-phase AC power supply 48 and the electromagnetic coil 8. The inverter 49 can freely change the frequency, current value, and voltage value of the power applied to the electromagnetic coil 8 by the three-phase AC power supply 48. The inverter 49 changes the frequency, current value, and voltage value of the power applied to the electromagnetic coil 8 to increase or decrease the power applied to the electromagnetic coil 8 by the three-phase AC power supply 48, thereby generating the electromagnetic coil 8. Change the strength of the rotating magnetic field.

  As shown in FIG. 2, the storage tank 9 includes a cylindrical member 50 whose outer wall is a single structure (the outer wall is a single wall) and a pair of sealing plates 56.

  The cylindrical member 50 is formed in a cylindrical shape and constitutes an outer shell of the storage tank 9. For this reason, the storage tank 9 is formed in a cylindrical shape while the outer wall is formed in a single structure because the cylindrical member 50 is formed in a single structure. The outer diameter of the cylindrical member 50, that is, the storage tank 9 is smaller than the inner diameter of the electromagnetic coil 8, and the outer diameter of the cylindrical member 50, that is, the storage tank 9 is larger than the outer diameter of the hollow holding member 32. The cylindrical member 50 is made of a nonmagnetic material.

  The pair of sealing plates 56 are formed in an annular shape. One sealing plate 56 is attached to the cylindrical member 50 by being fitted to the inner periphery of the one end portion 9 a of the cylindrical member 50. One sealing plate 56 passes the driven shaft 14 inside. The other sealing plate 56 is attached to the cylindrical member 50 by, for example, fitting into the inner periphery of the other end portion 9 b of the cylindrical member 50. The other sealing plate 56 passes the hollow holding member 32 inside. The sealing plate 56 regulates outflow of the magnetic abrasive grains 65 to the outside of the cylindrical member 50, that is, the storage tank 9. The one end portion 9 a forms one end portion of the cylindrical member 50, and the other end portion 9 b forms the other end portion of the cylindrical member 50.

  The storage tank 9 having the above-described configuration stores abrasive grains (hereinafter referred to as magnetic abrasive grains) 65 made of a magnetic material in the cylindrical member 50, and holds the workpiece 2 attached to the hollow holding member 32. It is accommodated in the cylindrical member 50. That is, the storage tank 9 stores both the workpiece 2 and the magnetic abrasive grains 65. Further, the magnetic abrasive grains 65 collide with the outer surface of the workpiece 2 by rotating (moving) the outer periphery of the workpiece 2 by the rotating magnetic field described above. The magnetic abrasive grains 65 collide with the outer surface of the workpiece 2, scrape a part of the workpiece 2 from the outer surface of the workpiece 2, and roughen the outer surface of the workpiece 2. . In the illustrated example, the magnetic abrasive grains 65 are formed in a cylindrical shape having an outer diameter of 1.0 mm and a length of 5.0 mm.

  Further, the storage tank 9 described above has one end portion 9 a accommodated in the cylindrical holding member 15 and supported by the fixed holding portion 4, and the other end portion 9 b supported by a column 66 erected from the base 3. The storage tank 9, that is, the cylindrical member 50 is arranged coaxially with the driven shaft 14, the hollow holding member 32, the electromagnetic coil 8, and the like by the fixed holding portion 4 and the column 66.

  As shown in FIG. 1, the cooling unit 11 includes a pressurized gas supply source 67, a flexible duct 68 having flexibility, and a nozzle 69. The pressurized gas supply source 67 supplies the pressurized gas to the flexible duct 68. As the pressurized gas supply source 67, a container such as a cylinder containing a pressurized gas such as compressed air, a sirocco fan or an axial blower that sends a gas such as pressurized air toward the flexible duct 68, etc. A blower or the like may be used.

  Moreover, it is desirable that the flow rate of the pressurized gas blown to the electromagnetic coil 8 from the nozzle 69 of the cooling unit 11 is 4 m / sec or more. Furthermore, it is desirable that the flow rate of the pressurized gas blown to the electromagnetic coil 8 from the nozzle 69 of the cooling unit 11 is 4 m / sec or more and 11 m / sec or less. Most preferably, the flow rate of the pressurized gas blown to the electromagnetic coil 8 from the nozzle 69 of the cooling unit 11 is 8 m / sec.

  The nozzle 69 is attached to the tip of the flexible duct 68 on the side away from the pressurized gas supply source 67. In the illustrated example, a pair of nozzles 69 are provided, and the pair of nozzles 69 are arranged at intervals from each other along the vertical direction. The nozzle 69 is disposed in the vicinity of the end of the electromagnetic coil 8 and is opposed to a space provided between the inner peripheral surface of the electromagnetic coil 8 and the outer peripheral surface of the storage tank 9.

  The nozzle 69 guides the pressurized gas supplied from the pressurized gas supply source 67 between the inner peripheral surface of the electromagnetic coil 8 and the outer peripheral surface of the storage tank 9. Thus, the cooling unit 11 guides the gas into the space by making the nozzle 69 relative to the space. Further, the nozzle 69 is disposed in the vicinity of the end portion of the electromagnetic coil 8 so as to be opposed to the above-described space, so that at least a part of the cooling unit 11 is disposed around the electromagnetic coil 8. In addition, the periphery of the electromagnetic coil 8 as used in the field of this invention has shown the both ends of this electromagnetic coil 8, an inner peripheral surface, and these vicinity. The nozzle 69 guides the pressurized gas supplied from the pressurized gas supply source 67 to the space between the inner peripheral surface of the electromagnetic coil 8 and the outer peripheral surface of the storage tank 9 and blows it onto the electromagnetic coil 8. . The cooling unit 11 cools the electromagnetic coil 8 by spraying the pressurized gas from the pressurized gas supply source 67 onto the electromagnetic coil 8.

  Next, the process of processing (roughening) the outer surface of the workpiece 2 using the surface treatment apparatus 1 having the above-described configuration will be described below.

  First, the support 12 is adjusted to position the driven shaft 14 of the fixed holding portion 4 so as to be coaxial with the hollow holding member 32. Then, the hollow holding member 32 is positioned outside the cylindrical member 50 of the storage tank 9 by the actuator 24. Then, the workpiece 2 is inserted into the hollow holding member 32 from the one end 32 a side of the hollow holding member 32. Then, the workpiece 2 is brought into contact with the step 34.

  Thereafter, the chuck cylinder is operated and the chuck shaft is slid toward the cylinder body of the chuck cylinder. Then, the chuck pawl 40 protrudes from the outer peripheral surface of the hollow holding member 32. Then, the workpiece 2 is sandwiched between the step 34 and the chuck claw 40 and the workpiece 2 is positioned (fixed) to the hollow holding member 32. Then, the hollow holding member 32, the workpiece 2 and the electromagnetic coil 8 are coaxial.

  Thereafter, the hollow holding member 32 to which the workpiece 2 is attached is inserted into the cylindrical member 50 of the storage tank 9 by the actuator 24. Then, the tapered portion 17 enters the one end portion 32 a of the hollow holding member 32, and the one end portion 32 a of the hollow holding member 32 is positioned. That is, the one end portion 32 a of the hollow holding member 32 is held by the fixed holding portion 4. Then, the actuator 24 is stopped.

  And the gas pressurized by the cooling part 11 is sprayed on the space, ie, the electromagnetic coil 8 mentioned above. Then, the workpiece 2 is rotated around the axis P together with the hollow holding member 32 by the driving motor 33. Thereafter, electric power from the three-phase AC power supply 48 is applied to the electromagnetic coil 8 to generate a rotating magnetic field in the electromagnetic coil 8. Then, as shown in FIG. 2, the magnetic abrasive grains 65 located inside the electromagnetic coil 8 revolve (rotate or move) around the axis P while rotating, so that the magnetic abrasive grains 65 are formed on the workpiece 2. Colliding with the outer surface, the outer surface of the workpiece 2 is roughened.

  Furthermore, when power is applied to the electromagnetic coil 8 for a predetermined time, the roughening of the outer surface of the workpiece 2 is finished.

  When the above-described roughening of the outer surface of the workpiece 2 is finished, the application of power to the electromagnetic coil 8 is stopped and the drive motor 33 is stopped. Further, the cooling unit 11 is stopped. The actuator 24 moves the hollow holding member 32 and the workpiece 2 to the outside of the cylindrical member 50 of the storage tank 9 to release the chuck 2 from holding the workpiece 2. The workpiece 2 whose outer surface has been roughened is removed from the hollow holding member 32, and a new workpiece 2 is attached to the hollow holding member 32. In this way, the outer surface of the workpiece 2 is roughened.

  According to the present embodiment, since the cooling unit 11 cools the electromagnetic coil 8, the electromagnetic coil 8 generates heat even when the workpiece 2 is processed for a long time, that is, the temperature of the electromagnetic coil 8 rises. Can be suppressed. For this reason, even if it processes the process target object 2 for a long time, it can suppress that the electrical resistance value of the electromagnetic coil 8 changes, and it processes the process target object 2 stably over a long time. be able to. That is, the surface treatment apparatus 1 can perform a certain roughening for a long time.

  Since the cooling unit 11 includes the pressurized gas supply source 67 and the nozzle 69, the electromagnetic coil 8 can be efficiently cooled.

  Since a space is provided between the electromagnetic coil 8 and the storage tank 9 and the gas is guided into the space, the gas passing through the space takes the heat of the electromagnetic coil 8. For this reason, the electromagnetic coil 8 can be cooled more efficiently.

  In addition, when the flow rate of the gas from the nozzle 69 of the cooling unit 11 is 4 m / sec or more, the coil unit 47 of the electromagnetic coil 8 can be reliably kept within the allowable temperature. Furthermore, if the flow rate of the pressurized gas blown to the electromagnetic coil 8 from the nozzle 69 of the cooling unit 11 is 4 m / sec or more and 11 m / sec or less, the electromagnetic coil 8 can be efficiently cooled. Furthermore, when the flow rate of the pressurized gas blown to the electromagnetic coil 8 from the nozzle 69 of the cooling unit 11 is 8 m / sec, the electromagnetic coil 8 can be cooled most efficiently.

  Since the workpiece 2 is held at the center of the storage tank 9, the magnetic abrasive grains 65 can collide with the outer surface of the workpiece 2 almost uniformly. Therefore, the outer surface of the workpiece 2 can be processed uniformly.

  By moving (revolving) the magnetic abrasive grains 65 on the outer periphery of the workpiece 2, the magnetic abrasive grains 65 can be reliably collided with the outer surface of the workpiece 2, and the machining of the workpiece 2 is ensured. Can be done.

  Since the workpiece 2 is rotated, the magnetic abrasive grains 65 can be uniformly collided with the outer surface of the workpiece 2 and the outer surface of the workpiece 2 can be processed more uniformly.

  When the inverter 49 arbitrarily changes the strength of the rotating magnetic field (for example, gradually increasing or decreasing the rotating magnetic field), the outer surface of the workpiece 2 is made uniform in the circumferential direction and the longitudinal direction. It can be processed so that

  Since the storage tank 9 is cylindrical, the storage tank 9 does not hinder the circumferential behavior of the magnetic abrasive grains 65 when a rotating magnetic field is applied to the magnetic abrasive grains 65. Therefore, stable processing is possible.

  Since the outer wall of the cylindrical member 50 of the storage tank 9 has a single structure, the distance from the electromagnetic coil 8 to the workpiece 2 can be shortened, and the rotating magnetic field generated by the electromagnetic coil 8 can be processed more efficiently. Can be used.

  The sealing plate 56 makes it possible to prevent the magnetic abrasive grains 65 from flowing out of the storage tank 9, improving workability and productivity during processing, and the effect is further enhanced by continuous processing. The processing device 1 can produce (process) the workpiece 2 as a mass production device on the premise of mass production.

  Next, the inventors of the present invention have confirmed the effects of the surface treatment apparatus 1 of the first embodiment described above, and the results are shown in FIG.

  In FIG. 3, the temperature of each part of the electromagnetic coil 8 and the storage tank 9 when the flow rate of the gas from the nozzle 69 is changed is measured. In the measurement, the gas pressurized from the nozzle 69 at each flow rate was introduced into the space, applied to the coil of each coil portion 47 of the electromagnetic coil 8 at a desired frequency, and the temperature when a predetermined time passed was measured. . Further, in the case shown at the leftmost end in FIG. 3, of course, no gas is blown from the nozzle 69 to the electromagnetic coil 8.

  3 indicates the temperature of the end portion of the coil portion 47 near the moving holding portion 6 described above, and the white square in FIG. 3 indicates the temperature of the center portion of the coil portion 47 described above. 3 indicates the temperature of the outer surface of the outer skin 46 described above, the white circle in FIG. 3 indicates the temperature of the end portion of the coil portion 47 near the fixed holding portion 4, and the white triangle in FIG. The temperature of the storage tank 9 mentioned above is shown. In the experiment whose result is shown in FIG. 3, the allowable temperature of the electromagnetic coil 8 is 80 ° C. That is, in the experiment whose result is shown in FIG. 3, the surface treatment apparatus 1 that must be operated so that the temperature of the electromagnetic coil 8 does not exceed 80 ° C. is used.

  According to FIG. 3, if the pressurized gas is not sprayed onto the electromagnetic coil 8, the temperature of at least the end portion of the coil portion 47 near the moving holding portion 6 exceeds 80 ° C. as the allowable temperature. On the other hand, according to FIG. 3, it became clear that the temperature of the electromagnetic coil 8 can be suppressed by blowing gas from the nozzle 69 to the electromagnetic coil 8 as compared with the case of not blowing. That is, it became clear that the electromagnetic coil 8 can be cooled by blowing gas from the nozzle 69 to the electromagnetic coil 8.

  Moreover, according to FIG. 3, when the flow velocity of the gas blown from the nozzle 69 to the electromagnetic coil 8 is 4 m / sec or more, it is clear that the temperature of each part of the electromagnetic coil 8 can be kept below 80 ° C. as the allowable temperature. It became. That is, it has been clarified that the coil portion 47 of the electromagnetic coil 8 can be reliably kept within the allowable temperature by setting the gas to 4 m / sec or more.

  Furthermore, according to FIG. 3, it has been clarified that the temperature of each part of the electromagnetic coil 8 cannot be significantly reduced even if the flow velocity of the gas is higher than 11 m / sec. For this reason, according to FIG. 3, when the flow velocity of the gas is 4 m / sec or more and 11 m / sec or less, the electromagnetic coil 8 is not wasted without wasting the pressurized gas from the pressurized gas supply source 67. It has become clear that the temperature of each part of the electromagnetic coil 8 can be reliably kept below 80 ° C. as the allowable temperature. That is, it has been clarified that the electromagnetic coil 8 can be efficiently cooled by setting the gas flow rate to 4 m / sec or more and 11 m / sec or less.

  Further, according to FIG. 3, it is clear that when the gas flow rate is 8 m / sec, the temperature of the electromagnetic coil 8 can be substantially minimized even when the gas flow rate is minimal, that is, the electromagnetic coil 8 can be substantially cooled most. Therefore, according to FIG. 3, when the flow rate of the gas is 8 m / sec, the electromagnetic coil 8 can be cooled without wasting the pressurized gas from the pressurized gas supply source 67, and the electromagnetic coil 8 It has been clarified that the temperature of each part can be reliably kept below 80 ° C. as the allowable temperature. That is, it became clear that the electromagnetic coil 8 can be cooled most efficiently by setting the flow rate of the gas to 8 m / sec.

  Next, a second embodiment of the present invention will be described with reference to FIGS. Note that the same parts as those in the first embodiment described above are denoted by the same reference numerals and description thereof is omitted.

  In the present embodiment, the electromagnetic coil 8 of the surface treatment apparatus 1 includes a plurality of heat radiation fins 70 as shown in FIGS. The heat radiating fin 70 is formed in a plate shape, extends from the yoke of the coil portion 47 toward the inner peripheral side of the electromagnetic coil 8, and extends linearly along the axis P. Yes. That is, the heat radiating fins 70 protrude from the inner peripheral surface of the main body portion to the inside of the electromagnetic coil 8.

  The total length of the radiating fin 70 is equal to the total length of the coil portion 47. The heat radiating fins 70 are made of a nonmagnetic material such as an aluminum alloy and a heat conductor material (metal). In the illustrated example, the thickness of the heat radiating fin 70 is about 1.0 mm. In the illustrated example, one radiating fin 70 is attached to the yokes of all the coil portions 47. The radiating fins 70 are attached to the yokes of the coil portions 47 by shrink fitting or the like. The heat generated by the coil portion 47, that is, the electromagnetic coil 8 is transmitted to the radiation fin 70.

  Further, in the present embodiment, the nozzle 69 is provided in the vicinity of the end portion of the radiating fin 70, and of course, the space between the inner peripheral surface of the electromagnetic coil 8 and the outer peripheral surface of the storage tank 9 described above. Guide the pressurized gas. Then, the nozzle 69 of the cooling unit 11 sprays the above-described pressurized gas onto the heat radiation fin 70, that is, the electromagnetic coil 8. The cooling unit 11 causes the pressurized gas to be blown to the radiating fin 70 by causing the nozzle 69 to face the end of the radiating fin 70. The cooling unit 11 cools the electromagnetic coil 8 by cooling the radiating fins 70.

  Similarly to the first embodiment described above, the surface treatment apparatus 1 of the present embodiment also accommodates the workpiece 2 in the storage tank 9, applies power from the three-phase AC power supply 48 to the electromagnetic coil 8, and The surface of the workpiece 2 is roughened while the cooling unit 11 cools the heat radiation fins 70, that is, the electromagnetic coils 8.

  According to this embodiment, since the cooling unit 11 cools the electromagnetic coil 8 as in the first embodiment described above, the workpiece 2 can be processed stably over a long period of time. . That is, the surface treatment apparatus 1 can perform a certain roughening for a long time.

  Moreover, since the surface treatment apparatus 1 of this embodiment is provided with the radiation fin 70, the surface area of the electromagnetic coil 8 becomes large, and the heat of the electromagnetic coil 8 is radiated outside through the radiation fin 70. For this reason, the electromagnetic coil 8 can be cooled more efficiently.

  Furthermore, since the surface treatment apparatus 1 of this embodiment blows gas to the radiation fin 70, the surface area of the part to which the gas of the electromagnetic coil 8 is sprayed becomes large while the radiation fin 70 is cooled, and the electromagnetic coil passes through the radiation fin 70. The heat of 8 is dissipated from the outside. For this reason, the electromagnetic coil 8 can be cooled more efficiently.

  Next, the inventors of the present invention have confirmed the effects of the surface treatment apparatus 1 of the second embodiment described above, and the results are shown in FIG.

  In FIG. 7, the surface treatment apparatus 1 (surface treatment apparatus 1 shown in the first embodiment) not provided with the radiation fins 70 and the surface treatment apparatus 1 shown in the second embodiment described above. In each, the temperature of each part of the electromagnetic coil 8 and the storage tank 9 when the gas pressurized from the nozzle 69 of the cooling unit 11 was sprayed on the electromagnetic coil 8 was measured.

  In the measurement, the gas pressurized from the nozzle 69 was introduced into the space, applied to the coil of each coil portion 47 of the electromagnetic coil 8 at a desired frequency, and the temperature when a predetermined time passed was measured. Further, in the surface treatment apparatus 1 shown in the second embodiment, the flow rate of the gas blown from the nozzle 69 to the heat radiation fin 70, that is, the electromagnetic coil 8, was measured in the case of 3 m / sec and 6 m / sec.

  The black circle in FIG. 7 indicates the temperature of the end portion of the coil portion 47 near the movement holding portion 6, and the white square in FIG. 7 indicates the temperature of the central portion of the coil portion 47 described above. 7 indicates the temperature of the outer surface of the outer skin 46 described above, the white circle in FIG. 7 indicates the temperature of the end portion of the coil portion 47 near the fixed holding portion 4, and the white triangle in FIG. The temperature of the storage tank 9 mentioned above is shown. In the experiment whose result is shown in FIG. 7, the allowable temperature of the electromagnetic coil 8 is 80 ° C. That is, in the experiment whose result is shown in FIG. 7, the surface treatment apparatus 1 that must be operated so that the temperature of the electromagnetic coil 8 does not exceed 80 ° C. is used.

  FIG. 7 reveals that the temperature of the electromagnetic coil 8 can be suppressed when the radiating fins 70 are provided, compared with the case where the radiating fins 70 are not provided. That is, it has been clarified that when the heat radiation fin 70 is provided, the electromagnetic coil 8 can be cooled more reliably than when the heat radiation fin 70 is not provided.

  In the second embodiment described above, the radiating fins 70 are projected from the coil portion 47, that is, the inner peripheral surface of the electromagnetic coil 8 to the inside of the electromagnetic coil 8. However, in the present invention, as shown in FIGS. 8 and 9, the heat dissipating fins 70 are protruded from the outer peripheral surface of the electromagnetic coil 8 toward the outside of the electromagnetic coil 8, and the nozzles 69 are disposed at the ends of the heat dissipating fins 70. And the pressurized gas from the nozzle 69 may be blown to the heat radiating fins 70. In FIG. 8 and FIG. 9, the same parts as those of the above-described embodiment are denoted by the same reference numerals and description thereof is omitted.

  In the case shown in FIGS. 8 and 9, the heat radiating fins 70 are attached to the outer skin 46 by shrink fitting or the like. The radiating fins 70 are formed in a plate shape and extend linearly along the axis P.

  Since the surface treatment apparatus 1 shown in FIGS. 8 and 9 includes the radiation fins 70, the surface area of the electromagnetic coil 8 is increased, and the heat of the electromagnetic coil 8 is radiated to the outside through the radiation fins 70. For this reason, the electromagnetic coil 8 can be cooled more efficiently. Furthermore, since the surface treatment apparatus 1 blows gas to the heat radiating fins 70, the electromagnetic coil 8 can be cooled more efficiently.

  Further, in the present invention, the heat radiating fins 70 are attached to the outer peripheral surface of the storage tank 9, and the pressurized gas from the nozzle 69 is blown between the inner peripheral surface of the electromagnetic coil 8 and the outer peripheral surface of the storage tank 9. good. Further, in the present invention, an arbitrary number of nozzles 69 may be provided, and the nozzles 69 may be arranged at arbitrary positions.

  In the above-described embodiment, the pressurized gas is blown onto the electromagnetic coil 8 to cool the electromagnetic coil 8. However, the surface treatment apparatus 1 of the present invention may include a cooling device 71 shown in FIG. 10 as a cooling means. As illustrated in FIG. 10, the cooling device 71 may include a pipe 72, a refrigerant tank 73, an expansion valve 74, a compressor 75, and a heat exchanger 76. In FIG. 10, the same parts as those of the above-described embodiment are denoted by the same reference numerals and description thereof is omitted.

  A part of the pipe 72 is attached to the outer skin 46 of the electromagnetic coil 8, that is, the outer peripheral surface. That is, the cooling device 71 is disposed around the electromagnetic coil 8. The pipe 72 connects the above-described refrigerant tank 73, the expansion valve 74, the compressor 75, and the heat exchanger 76 in series. The refrigerant tank 73 stores the refrigerant cooled by the heat exchanger 76. The expansion valve 74 expands and cools the refrigerant in the refrigerant tank 73 and sends it to the compressor 75 through a pipe 72 attached to the electromagnetic coil 8.

  The refrigerant in the pipe 72 flows from the expansion valve 74 toward the compressor 75, deprives the electromagnetic coil 8 of heat, and is heated. That is, the refrigerant in the pipe 72 cools the electromagnetic coil 8. The compressor 75 compresses and liquefies the refrigerant heated by the electromagnetic coil 8 and sends it out to the heat exchanger 76. The heat exchanger 76 cools the refrigerant liquefied by the compressor 75 and sends it out to the refrigerant tank 73.

  The cooling device 71 described above passes the refrigerant through the pipe 72, circulates the refrigerant in order through the refrigerant tank 73, the expansion valve 74, the compressor 75, and the heat exchanger 76 to cool the electromagnetic coil 8, thereby The temperature rise of the coil 8 is suppressed, and the temperature of the electromagnetic coil 8 is kept below the allowable temperature. And the cooling device 71 enables the continuous processing object 2 of the surface treatment device 1 to be processed.

  When the cooling device 71 shown in FIG. 10 is used, the piping 72 of the cooling device 71 may be attached to the inner peripheral surface of the electromagnetic coil 8.

  The present invention is not limited to the above embodiment. That is, various modifications can be made without departing from the scope of the present invention. That is, the holding unit and the rotating unit are not limited to the configurations and arrangements described in the embodiments, and may be various configurations and arrangements.

It is a side view which shows the structure of the outline of the surface treatment apparatus concerning the 1st Embodiment of this invention in a partial cross section. It is a side view which shows the state in operation | movement of the surface treatment apparatus shown by FIG. It is explanatory drawing explaining the effect of the surface treatment apparatus shown by FIG. It is a side view which shows the state in operation | movement of the surface treatment apparatus concerning the 2nd Embodiment of this invention in a partial cross section. It is a sectional side view of the electromagnetic coil of the surface treatment apparatus shown by FIG. It is sectional drawing which follows the VI-VI line in FIG. It is explanatory drawing explaining the effect of the surface treatment apparatus shown by FIG. It is a sectional side view which shows the modification of the electromagnetic coil shown by FIG. It is sectional drawing which follows the IX-IX line in FIG. It is explanatory drawing which shows the cooling device as a cooling means of the surface treatment apparatus of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Surface treatment apparatus 2 Work object 8 Electromagnetic coil (magnetic field generation part)
9 Storage tank 11 Cooling part (cooling means)
33 Drive motor (rotating means)
40 Chuck claw (holding means)
45 Main Body 65 Magnetic Abrasive Grain 67 Pressurized Gas Supply Source 69 Nozzle 70 Radiating Fin 71 Cooling Device (Cooling Means)
P axis (longitudinal direction of the storage tank)

Claims (9)

A storage tank for storing the workpiece and magnetic abrasive grains;
In a surface treatment apparatus comprising a magnetic field generator for generating a rotating magnetic field for moving the magnetic abrasive grains in the storage tank and causing the magnetic abrasive grains to collide with the workpiece by the rotating magnetic field,
A surface treatment apparatus comprising cooling means for cooling the magnetic field generator.   The surface treatment apparatus according to claim 1, further comprising holding means for holding the object to be processed at a center of the storage tank.   The surface treatment apparatus according to claim 2, wherein the magnetic field generation unit moves the magnetic abrasive grains on the outer periphery of the workpiece.   The surface treatment apparatus according to claim 3, further comprising a rotating unit configured to rotate the workpiece to be rotated around an axis parallel to the longitudinal direction of the storage tank.   5. The cooling means includes a pressurized gas supply source and a nozzle that blows pressurized gas from the pressurized gas supply source onto the magnetic field generation unit. The surface treatment apparatus as described in any one of these.   The surface treatment apparatus according to claim 5, wherein a space is provided between the magnetic field generation unit and the storage tank, and the cooling means guides gas into the space.   The surface treatment apparatus according to claim 5, wherein the magnetic field generation unit includes a main body formed in a cylindrical shape, and a heat radiating fin protruding inward from an inner peripheral surface of the main body.   The surface treatment apparatus according to claim 5, wherein the magnetic field generation unit includes a main body formed in a cylindrical shape, and a heat radiating fin protruding outward from an outer peripheral surface of the main body.   9. The surface treatment apparatus according to claim 7, wherein the cooling means blows a pressurized gas to the radiating fins.

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