JP2006281063A - Fixture for surface treatment and surface treatment method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fixture for surface treatment capable of enhancing a working efficiency and a use efficiency of a surface treatment liquid, and a surface treatment method using this. <P>SOLUTION: The fixture 10 for the surface treatment used for the surface treatment of a plurality of element bodies 1 to be treated is provided with an element body storage part 2 for storing the plurality of element bodies 1 to be treated; and partition parts 8, 9 provided on the element body storage part 2 and partitioning the plurality of element bodies 1 to be treated so as to leave them each other. The element body storage part 2 has at least one opening. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a surface treatment jig and a surface treatment method for surface-treating an object to be treated such as a magnet element constituting a rare earth magnet.

  Conventionally, rare earth magnets are known as high performance permanent magnets. These are not only used for household appliances such as conventional air conditioners and refrigerators, but are also being applied to drive motors such as industrial machines, robots, fuel cell vehicles and hybrid cars. It is expected that energy saving can be realized. Among such rare earth magnets, R—Fe—B (R is a rare earth element) type magnet has attracted attention because it has particularly high magnetic properties. As such R—Fe—B rare earth magnets, for example, those described in Patent Document 1 and Patent Document 2 below are known.

  These R—Fe—B rare earth magnets are high-performance magnets exhibiting a high energy product exceeding 25 MGOe. However, since it contains rare earth elements and iron as the main components of the magnet, it is very easily oxidized and has low temperature resistance. For this reason, these magnets tend to have low corrosion resistance, and it is difficult to avoid deterioration of magnetic characteristics over time due to long-term use.

  Therefore, in recent years, attempts have been made to form a protective layer on the surface of the magnet body in order to improve the corrosion resistance of such R—Fe—B rare earth magnets. For example, Patent Document 3 listed below describes a rare earth magnet in which an oxidation-resistant metal film is formed on the surface of a magnet body by plating, thereby improving the oxidation resistance of the magnet.

  Patent Document 4 listed below describes a rare earth magnet in which a resin film is formed on the surface of a magnet body, thereby improving the oxidation resistance of the magnet. Furthermore, the following Patent Document 5 describes a rare earth magnet in which a dense coating made of a metal oxide is formed on the surface of a magnet body by a sol-gel method, thereby improving the corrosion resistance and alkali resistance of the magnet. Yes.

As a method of forming the protective layer on the surface of the magnet body by treating the entire surface of the magnet body as described above, for example, a treatment liquid in which metal flakes and complexing agents are dispersed in silicone is sprayed. A so-called spray coating method for coating is known (see, for example, Patent Document 6).
JP 59-46008 A JP-A-60-9852 JP-A-60-54406 JP-A-60-63901 JP 2001-76914 A JP 2003-158006 A

  By the way, when the magnet body is surface-treated with the treatment liquid, in order to reduce unevenness in characteristics such as shape dimensions, surface hardness, corrosion resistance, adhesiveness when using the adhesive, etc. in the obtained magnet, It is necessary to apply the treatment liquid uniformly.

However, in the spray coating method described above, the entire surface of the magnet body cannot be applied simultaneously if an attempt is made to uniformly apply the treatment liquid to the entire surface of the magnet body. For this reason, the operation | work which apply | coats a process liquid to each surface is needed, a work takes a lot of time, and work efficiency falls remarkably.
Further, since the spraying is performed on portions other than the element body, the loss of the treatment liquid is large. Therefore, there has been a problem that the surface treatment of the magnet body is very expensive.

  In addition, in order to improve the working efficiency of the surface treatment and the use efficiency of the treatment liquid, it may be considered that the surface treatment is collectively performed on the plurality of magnet bodies by barrel plating, barrel spray, dip spin, or the like. However, this causes inconveniences such as sticking when the magnet bodies are chipped due to collisions, or when the magnet bodies have curved surfaces that are flat or uneven, and the entire surface of the magnet bodies is uniform. Can not be processed. That is, when the surface treatment of the magnet body is performed by a method such as barrel plating, the working efficiency is improved, but the product yield is lowered.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a surface treatment jig and a surface treatment method using the same, which can improve the working efficiency and the use efficiency of the surface treatment liquid. To do.

  In order to solve the above-described problems, the present invention provides a surface treatment jig used for surface treatment of a plurality of element bodies to be processed, an element body accommodating portion for accommodating the plurality of element bodies to be processed, and an element body The surface treatment jig includes at least one partition portion that is provided in the housing portion and partitions the plurality of processing target bodies so as to be separated from each other, and the body body housing portion has at least one opening.

  According to this surface treatment jig, a plurality of elements to be processed are accommodated in the element accommodating portion. At this time, the plurality of element bodies to be processed are partitioned by the partition portion so as to be separated from each other. Then, when the element body accommodating part is immersed in the surface treatment liquid in this state, the surface treatment liquid is introduced into the element body accommodating part through the opening of each element element accommodating part, and the element body to be treated is immersed in the surface treatment liquid. The As a result, the entire surface of the element to be processed can be surface-treated with the surface treatment liquid at a time, and work efficiency is improved. Further, by immersing the element body containing portion in the surface treatment liquid, the surface treatment liquid is less lost during the surface treatment of the element to be treated, and the use efficiency of the surface treatment liquid is improved. Furthermore, since the plurality of elements to be processed are partitioned so as to be separated from each other by the partition portion, collision between the elements to be processed is sufficiently prevented, and chipping of the elements to be processed is sufficiently prevented. It becomes possible.

  The surface treatment jig of the present invention preferably has a wire for holding the element to be processed at a position facing the opening into which the element to be processed is inserted. In this case, when the element to be processed is inserted into the opening of the element accommodating portion, the element to be processed comes into contact with the wire. Thereby, it becomes possible to reduce the area of the part which contacts with the element for processing, and to treat the surface of the element for processing more uniformly.

  Further, the surface treatment method of the present invention includes an element body accommodating step of accommodating a plurality of element bodies to be treated so as to be separated from each other by a partition portion in the element body accommodating portion of the surface treatment jig described above. A dip coating step of immersing the element to be processed accommodated in the element accommodating part in the surface treatment liquid to apply the surface treatment liquid to the surface of the element to be treated, and a plurality of elements to be treated. It is characterized by including a centrifugal separation step of centrifuging in a state accommodated in a surface treatment jig and removing a part of the surface treatment liquid, and a heat treatment step of heat treating the surface treatment liquid.

  According to this surface treatment method, since a plurality of elements to be treated are accommodated in the element body accommodating part and immersed in the surface treatment liquid, the surface treatment liquid enters the element body accommodating part through the opening of the element body accommodating part. The element for processing is immersed in the surface treatment liquid. As a result, the entire surface of the element to be processed can be surface-treated with the surface treatment liquid at a time, and work efficiency is improved. Further, by immersing the element body containing portion in the surface treatment liquid, the surface treatment liquid is less lost during the surface treatment of the element to be treated, and the use efficiency of the surface treatment liquid is improved. Furthermore, since the plurality of elements to be processed are separated from each other by the partition part, collision between the elements to be processed is sufficiently prevented, and chipping of the elements to be processed is sufficiently prevented. It becomes possible to do.

  In the element housing step, the element to be processed is inserted into the opening of the partition part, and at least one edge of the element to be processed is brought into contact with at least one point of the partition part. It is preferable to support the element body.

  In this case, the edge of at least one point of the element to be processed is in point contact with at least one point of the partition. For this reason, it becomes possible to reduce sufficiently the contact area of the to-be-processed element body and a partition part, and the surface of the to-be-processed element body can be processed more uniformly.

  The surface treatment method is particularly effective when the surface treatment liquid is one selected from the group consisting of a sol liquid, a resin paint, and water glass.

  The surface treatment method is particularly effective when the element to be treated is a metal magnet. That is, when the element to be processed is a metal magnet, the metal magnet has a relatively large flat surface or a curved surface in which the concaves and convexes coincide with each other. According to the surface treatment method, such a situation can be prevented, and the element to be treated can be uniformly surface treated. Further, even when surface treatment is performed on a plurality of elements to be processed, collision between the elements to be processed can be sufficiently prevented. This is effective in the case of a metal magnet that is liable to cause erosion.

  According to the surface treatment jig and the surface treatment method using the same according to the present invention, work efficiency and use efficiency of the surface treatment liquid can be improved.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(Surface treatment jig)
First, before describing the embodiment of the surface treatment method of the present invention, an embodiment of the surface treatment jig of the present invention used in the surface treatment method will be described in detail. Here, a case where a flat rare earth metal magnet element is used as the element to be processed will be described as an example.

  FIG. 1 is a perspective view showing an embodiment of the surface treatment jig of the present invention, and FIG. 2 is a plan view showing the surface treatment jig of FIG.

  As shown in FIGS. 1 and 2, the surface treatment jig 10 of the present embodiment includes an element body accommodating portion 2 having a rectangular parallelepiped shape that accommodates a plurality of plate-like magnet elements 1.

  More specifically, the element body accommodating portion 2 has a rectangular bottom frame 3, and four columns 4 </ b> A to 4 </ b> D extend from four vertices of the bottom frame 3. The four struts 4A to 4D are parallel to each other. The tips of the four columns 4 </ b> A to 4 </ b> D are connected to the vertices of the rectangular upper frame 5. The upper frame 5 and the bottom frame 3 are arranged in parallel to each other.

  A plurality of support wires 6 for supporting the magnet element body 1 are provided inside the bottom frame 3 so that the magnet element body 1 does not fall out when the magnet element body 1 is accommodated in the element body accommodating portion 2. ing. In the present embodiment, two support wires 6 are provided along the long side of the rectangular bottom frame 3, and one support wire 6 is provided along the short side of the bottom frame 3.

  Further, a rectangular intermediate frame 7 is provided between the upper frame 5 and the bottom frame 3 so as to reinforce the element housing part 2. Thus, since the element | base_body accommodating part 2 is comprised by the four support | pillars 4A-4D, the top frame 5, the intermediate | middle frame 7, and the bottom frame 3, it has multiple opening. Specifically, the plurality of openings include an opening formed by the columns 4A and 4B, the upper frame 5 and the intermediate frame 7, an opening formed by the columns 4A and 4B, the intermediate frame 7 and the bottom frame 3, and the columns 4C and 4D. An opening formed by the upper frame 5 and the intermediate frame 7, an opening formed by the columns 4C and 4D, the intermediate frame 7 and the bottom frame 3, and an opening formed by the columns 4A and 4C, the upper frame 5 and the intermediate frame 7. And an opening formed by the columns 4A and 4C, the intermediate frame 7, and the bottom frame 3, an opening formed by the columns 4B and 4D, the upper frame 5, and the intermediate frame 7, and the columns 4B and 4D, the intermediate frame 7, and the bottom. An opening formed by the frame 3, an opening formed by the upper frame 5 and the partition 8, and the bottom frame 3 and support It is constituted by an opening formed by the ear 6. In addition, as described above, the element body accommodating portion 2 is composed of the four columns 4A to 4D, the upper frame 5, the intermediate frame 7, and the bottom frame 3, so that the plate-like magnet element body 1 is the element. When accommodated in the body accommodating portion 2, the contact area between the magnet element body 1 and the element body accommodating portion 2 can be reduced.

  The element body accommodating portion 2 is provided with an upper partition portion 8 that partitions the plurality of plate-shaped magnet element bodies 1 so as to be separated from each other inside the upper frame 5. The upper partition portion 8 is formed in a lattice shape and has a plurality of upper insertion ports 8a for inserting the respective magnet elements 1. Here, the upper partition portion 8 is formed in a lattice shape by intersecting a plurality of rod-shaped members with each other, and forms an upper insertion port 8a. And the support wire 6 is arrange | positioned in the position facing the upper insertion port 8a. The upper insertion port 8a constitutes one of a plurality of openings.

  Similarly, the element body accommodating portion 2 is provided with a lower partition portion 9 that divides the plurality of plate-shaped magnet element bodies 1 so as to be separated from each other inside the intermediate frame 7. The lower partition part 9 is formed in a lattice shape, and has a plurality of lower insertion ports 9a for inserting the respective magnet elements 1. Here, the lower partition portion 9 is formed in a lattice shape by crossing a plurality of rod-shaped members, and forms a lower insertion port 9a.

  Here, both the upper insertion port 8a and the lower insertion port 9a have a rhombus shape. That is, one set of internal angles of two opposing rectangular internal angles is an acute angle or an obtuse angle. In other words, the angle formed by the intersecting rod-shaped members is an acute angle or an obtuse angle. For this reason, the edge part 1a of the plate-shaped magnet element body 1 is brought into contact with one point on the upper partition part 8b and one point on the lower partition part 9b, and the edge part 1b which is the other end of the magnet element body 1 is connected. One point on the upper partition portion 8c and one point on the lower partition portion 9c are brought into contact with each other, and the edge 1c, which is another end of the magnet body 1, is placed on one point on the upper partition portion 8d and the lower partition portion 9d. The magnet body 1 is supported by bringing it into contact with one upper point.

  Moreover, the upper partition part 8 and the lower partition part 9 have the same shape and size. Therefore, the upper insertion port 8a formed in the upper partition 8 and the lower insertion port 9a formed in the lower partition 9 coincide with each other along the direction from the upper frame 5 toward the intermediate frame 7. It is in a positional relationship. Therefore, when the magnet body 1 is sequentially inserted into the upper insertion port 8a of the upper partition 8 and the lower insertion port 9a of the lower partition 9, the magnet body 1 can be smoothly inserted.

(Surface treatment method)
Next, a surface treatment method of the magnet body 1 using the surface treatment jig 10 described above will be described.

  First, a plate-like magnet element body 1 is prepared as an element to be processed.

  Next, the magnet element body 1 is accommodated in the element body accommodating portion 2 of the surface treatment jig 10 (element body accommodating step). In this case, each magnet body 1 may be inserted into the upper insertion port 8 a of the upper partition part 8 and then inserted into the lower insertion port 9 a of the lower partition part 9. Thereby, the magnet body 1 is supported by the support wire 6.

  Next, the surface treatment jig 10 is immersed in the surface treatment liquid to immerse the plurality of magnet bodies 1 in the surface treatment liquid and apply the surface treatment liquid to the surface of the magnet body 1 (dip coating). Process).

  Subsequently, the surface treatment jig 10 is pulled up from the surface treatment liquid and fixed to the centrifuge. When the centrifuge is operated in this state, a part of the surface treatment liquid applied to the surface of the magnet body 1 is removed by centrifugation.

  After completion of the centrifugation or simultaneously with the centrifugation, the magnet body 1 is heat-treated in a state of being accommodated in the surface treatment jig 10 (heat treatment step). Thereby, the magnet body 1 is dried. In addition, after the magnet body 1 is dried, baking or heat curing treatment may be performed as necessary. In this case, in order to prevent the surface treatment liquid from being baked or solidified on the surface treatment jig 10 and to heat the magnet body 1 more uniformly, a plurality of magnet elements are removed from the surface treatment jig 10. You may perform the said baking or heat-hardening process, after removing the body 1. FIG. Thus, the surface treatment of the magnet body 1 is completed.

  According to the surface treatment method of the magnet element body 1 as described above, the plurality of magnet element bodies 1 are accommodated in the element body accommodating portion 2 and immersed in the surface treatment liquid. The magnet body 1 is immersed in the surface treatment liquid. As a result, the entire surface of the magnet body 1 can be surface-treated at once with the surface treatment liquid. For this reason, the efficiency of the surface treatment work of the magnet body 1 can be sufficiently improved.

  Further, by immersing the element body accommodating portion 2 in the surface treatment liquid, the surface treatment liquid is less lost during the surface treatment of the magnet element body 1 and the use efficiency of the surface treatment liquid can be improved.

  Therefore, according to the surface treatment method of the present embodiment, the cost for the surface treatment of the magnet body 1 can be greatly reduced.

  Further, since the support wire 6 is disposed at a position facing the upper insertion port 8a, when the magnet body 1 is inserted into the upper insertion port 8a and the lower insertion port 9a, the magnet body 1 comes into contact with the support wire 6. . Thereby, when the magnet element body 1 is accommodated in the element body accommodating portion 2 with the support wire 6 facing downward, it is possible to prevent the magnet element body 1 from falling off. In addition, the area of the portion in contact with the magnet body 1 can be reduced, and the surface of the magnet body 1 can be treated more uniformly.

  Furthermore, since the plurality of magnet bodies 1 are separated from each other by the upper partition portion 8 and the lower partition portion 9, collision between the magnet body bodies 1 is sufficiently prevented, and Chipping can be sufficiently prevented. For this reason, the yield of the magnet obtained can be improved. In particular, in the present embodiment, the rare earth magnet element 1 is used as the element to be processed, and the magnet elements 1 stick to each other and easily cause unevenness in the surface treatment. The surface treatment jig 10 of this embodiment is also useful in terms of prevention. In addition, since the magnet element body 1 is a metal magnet and has a relatively large flat surface, the magnet element bodies 1 are likely to stick to each other during surface treatment. However, according to the surface treatment method, such a situation is prevented. The magnet body 1 can be uniformly surface-treated. Further, even when the plurality of magnet elements 1 are surface-treated, the collision between the plurality of magnet elements 1 can be sufficiently prevented, so that the surface treatment jig 10 of the present embodiment is particularly likely to be chipped due to the collision. This is effective when surface treatment is performed on the magnet element body 1 that is a metal magnet.

  Further, in the present embodiment, the surface treatment jig 10 is a surface treatment jig provided with partition portions 8 and 9 having a plurality of rectangular insertion ports 8a and 9a for inserting the magnet body 1, and a magnet. The element body 1 is inserted into the insertion ports 8 a and 9 a of the partition parts 8 and 9, and the edges 1 a to 1 c of the magnet element body 1 are brought into contact with one point on the partition parts 8 and 9.

  For this reason, it becomes possible to make the magnetic element body 1 and the partition parts 8 and 9 make point contact. Therefore, the contact area between the magnet body 1 and the partitioning portions 8 and 9 can be sufficiently reduced, and the surface of the magnet body 1 can be treated more uniformly.

  Examples of the surface treatment liquid include sol liquid, resin paint, water glass, cleaning liquid, and etching liquid. Among these, the surface treatment method is particularly effective when the surface treatment liquid is any one of a sol liquid, a resin paint, and water glass. This is because the sol solution, the resin paint, and the water glass form a film on the surface of the magnet body 1 in order to prevent oxidation and corrosion of the magnet body 1, and the thickness of such a film is uniform. This is because the property directly affects the corrosion resistance of the magnet. However, the surface treatment liquid may be a cleaning liquid or an etching liquid. This is because a film is not formed on the surface of the magnet body 1, but the degree of cleaning of the magnet body 1 and the degree of etching to the magnet body 1 indirectly affect the performance of the magnet.

  The sol solution is used for forming a metal oxide layer for improving the corrosion resistance of the magnet body 1, and as the sol solution, for example, one or two of Si, B, Al, Mg, Ti, and Zr are used. What contains the metal alkoxide which has a metal element more than a seed | species as a main component can be used. In this case, the surface treatment liquid is dried and fired in the heat treatment. Thereby, a metal oxide layer is formed on the surface of the magnet body 1.

  The resin paint is used for forming a resin layer for improving the corrosion resistance of the magnet body 1. Examples of the resin paint include epoxy resin, phenol resin, silicone resin, acrylic resin, and melanin resin having corrosion resistance and heat resistance. A paint containing one or more resin components selected from urethane resins is used. In this case, in the heat treatment, the surface treatment liquid is dried and heat-cured, and a resin layer is formed on the surface of the magnet body 1. Here, the thickness of the resin layer is, for example, 3 to 20 μm.

  The cleaning liquid is used to remove surface contaminants from the magnet body 1, and as such a cleaning liquid, pure water or a solvent such as alcohol is added with a detergent of about several percent, or a degreasing agent such as an alkali or an organic solvent. Etc. are used.

  The etching solution is used for removing a surface-modified layer such as a processing strain layer or a reaction layer on the surface of the magnet body 1, and as the etching solution, hydrochloric acid, nitric acid, phosphoric acid, sulfuric acid, a mixed acid thereof or an aqueous solution thereof, Alternatively, an organic acid is used.

  The viscosity of the surface treatment liquid is usually 0.1 to 30 mPa · s. When the viscosity exceeds 30 mPa · s, it tends to be difficult to uniformly process or form a film on the surface of the magnet body 1 as compared with the case where the viscosity is within the above range. On the other hand, when the viscosity is less than 0.1 mPa · s, there is a tendency that the film thickness necessary for satisfying the corrosion resistance of the element body cannot be obtained as compared with the case where the viscosity is in the above range. In particular, when the surface treatment liquid is a sol liquid or a resin paint, in order to satisfy a desired corrosion resistance, a film thickness of a certain level or more is required, so that the viscosity is a value within the above range. It is necessary to increase the partial concentration as much as possible. In this case, the solid content concentration is usually 1 to 50% by mass.

  The present invention is not limited to the above embodiment. For example, in the above-described embodiment, the shapes of the upper insertion port 8a and the lower insertion port 9a are rhombuses, but instead of the rhombuses, for example, they may be rectangular as shown in FIG. Furthermore, the shape of the upper insertion port 8a and the upper insertion port 9a may be a square, a pentagon, a hexagon, or a triangle in addition to a rhombus and a rectangle. In short, the shapes of the upper insertion port 8a and the upper insertion port 9a may be polygonal. However, the shape of the upper insertion port 8a and the upper insertion port 9a may be a shape in which at least one side has a curve, for example, a fan shape. Even in this case, the plate-shaped magnet element body 1 can be stably held by the point contact of the edge of the plate-shaped magnet element body 1 on the side of the fan-shaped insertion slot.

  Furthermore, although the shape of the element body accommodating portion 2 is a rectangular parallelepiped, it may be a hexagonal cylinder (see FIG. 4) or a cylinder (see FIG. 5). 4 and 5, the inner portion of the element body accommodating portion 2 is a space 10, and the rotation center of the centrifuge is arranged in the space 10. Therefore, when the rotation center of the centrifuge is arranged in the space 10 inside the element body accommodating portion 2, the magnet element body 1 accommodated in the element body accommodating portion 2 receives substantially the same centrifugal force during centrifugation. The surface treatment state of the magnet body 1 can be made uniform.

  Furthermore, in the above-described embodiment, the element body accommodating portion 2 is configured by the upper frame 5, the intermediate frame 7, the bottom frame 3, and the support columns 4A to 4D, and thus has a plurality of openings. And you may be comprised with the container which has a through-hole in a bottom face.

  In the above embodiment, the rare earth metal magnet element 1 is described as an example of the element to be processed. However, the element to be processed may be other than the rare earth metal magnet element 1. . Examples of such an element to be processed include composite module elements such as piezoelectric elements, magnetostrictive elements, and hybrid ICs. The shape of the magnet body 1 is not limited to a flat plate shape, and may be a curved plate shape, for example.

  Hereinafter, although the content of the present invention is explained more concretely using an example, the present invention is not limited to the following examples.

Example 1
First, a flat R-Fe-B metal magnet having a width of 25 mm, a length of 50 mm, and a thickness of 5 mm was prepared as a magnet body.

On the other hand, JIS K5554 phenol resin-based mica-like iron oxide paint (trade name: Ferrodol F33 manufactured by Kansai Paint Co., Ltd.) was prepared as a resin, and methyl ethyl ketone 40 mass%, methyl isobutyl ketone 40 mass% and xylene 20 mass% as thinner. A mixed solution was prepared. And after mixing these in a container so that it might become the following ratios, it fully stirred with the stirrer and obtained the resin coating material as a surface treatment liquid.
Resin: 20 parts by mass Solvent: 80 parts by mass

  Next, nine jigs for surface treatment having the configuration shown in FIGS. Here, the element housing portion was constituted by a 2 mmφ SUS wire. And 150 magnet element bodies were accommodated in the element accommodating part of the jig for surface treatment. At this time, the magnet body was sequentially inserted into the upper insertion port of the upper partition part and the lower insertion port of the lower partition part.

  Next, the surface treatment jig was immersed in the resin paint for 5 seconds, so that the plurality of magnet bodies were immersed in the resin paint, and the resin paint was applied to the surface of the magnet body.

  Subsequently, the surface treatment jig was pulled up from the resin paint, and the surface treatment jig was fixed to the centrifugal dryer. In this state, the centrifugal dryer was operated to perform centrifugal separation, and excess resin paint was shaken off. At this time, the resin paint was also dried. The rotation speed of the centrifugal dryer was 500 rpm, and the centrifugation time was 20 seconds.

  After completion of the centrifugation, the surface treatment jig was taken out from the centrifuge, and the magnet body coated with the resin paint was opened on the tray.

  Subsequently, the resin coating was heat-cured at 150 ° C. for 20 minutes. And the process from the immersion in a resin coating to the heat curing process was performed again on this magnet body. That is, a total of two coatings were applied to the magnet body.

  Thus, a resin layer was formed on the surface of the magnet body to obtain a rare earth magnet.

(Comparative Example 1)
A plate-shaped R—Fe—B metal magnet having a width of 25 mm × a length of 50 mm × a thickness of 5 mm was prepared as a magnet body.

On the other hand, JIS K5554 phenol resin-based mica-like iron oxide coating amount (trade name: Ferrodol F33 manufactured by Kansai Paint Co., Ltd.) was prepared as resin, and methyl ethyl ketone 40 mass%, methyl isobutyl ketone 40 mass% and xylene 20 mass% as thinner. A mixed solution was prepared. And after mixing these in a container so that it might become the following ratios, it fully stirred with the stirrer and obtained the resin coating material as a surface treatment liquid.
Resin: 40 parts by mass Solvent: 60 parts by mass

  Next, 150 magnet bodies were arranged in 25 × 6 rows on a SUS net tray.

Next, a resin paint was sprayed on the magnet body. The spray conditions are shown below.
Distance between spray gun and body: 25cm,
Discharge amount: 100 cc / min,
Atomization pressure: 1.0 kgf
Spray gun speed: 100mm / sec

  Next, after leaving the leveling time for 1 minute, that is, after leaving the magnet body for 1 minute for leveling, the resin coating was heat-cured at 150 ° C. for 20 minutes. After the heat curing step, all the magnet bodies were inverted and the steps from spraying the resin paint to the heat curing treatment were performed again. That is, a total of two coatings were applied to the magnet body.

  When the surfaces of the rare earth magnets obtained in Example 1 and Comparative Example 1 were observed, film thickness unevenness was reduced in all cases. Here, the film thickness non-uniformity was evaluated by a salt spray test in which a rare earth magnet was sprayed with a 5% sodium chloride aqueous solution at 35 ° C. for 96 hours to examine changes in rust generation and magnetic characteristics on the surface. In all cases, the flux loss due to rusting was good within 3%. In Example 1, the total work time from setting of the magnet body excluding the drying process to resin coating was 5 minutes, whereas in Comparative Example 1, the total work time was 15 minutes. From this, it can be seen that according to the surface treatment method of Example 1, the yield and quality of the product are the same as those of the surface treatment method of Comparative Example 1, the work efficiency is greatly improved, and the cost can be greatly reduced. It was.

  Furthermore, it was found that the use efficiency of the paint in Example 1 was 60%, and the use efficiency of the paint in Comparative Example 1 was 20%.

  Therefore, according to the surface treatment jig and the surface treatment method using the same according to the present invention, it was confirmed that the work efficiency and the use efficiency of the surface treatment liquid can be improved, and that the cost can be greatly reduced. .

It is a perspective view which shows one Embodiment of the jig for surface treatment of this invention. It is a top view which shows the jig for surface treatment of FIG. It is a top view which shows other embodiment of the jig for surface treatment of this invention. It is a top view which shows other embodiment of the jig for surface treatment of this invention. It is a top view which shows other embodiment of the jig for surface treatment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Magnet element | base_body (element to be processed), 2 ... Element body accommodating part, 3 ... Bottom frame (element body accommodating part), 4A-4D ... Column (element body accommodating part), 5 ... Upper frame (element body) (Accommodating part), 6 ... support wire (element body accommodating part), 7 ... intermediate frame (element body accommodating part), 8 ... upper partition part, 8a ... upper insertion port, 9 ... lower partition part, 9a ... lower insertion port, 10 ... Jig for surface treatment.

Claims (5)

A surface treatment jig used for surface treatment of a plurality of elements to be treated,
An element body accommodating portion for accommodating the plurality of elements to be processed;
Provided in the element body accommodating portion, and comprising at least one partition portion that partitions the plurality of element bodies to be processed so as to be separated from each other;
The element body accommodating portion has at least one opening;
Surface treatment jig.   The surface treatment jig according to claim 1, wherein the element body accommodating portion has a wire that holds the element to be processed at a position facing an opening into which the element to be processed is inserted. An element body accommodating step of accommodating the plurality of element bodies to be treated so as to be separated from each other by the partition portion in the element body accommodating portion of the surface treatment jig according to claim 1 or 2;
A dip coating step of immersing the element body to be processed contained in the element body accommodating portion in a surface treatment liquid and applying the surface treatment liquid to the surface of the element to be treated;
A centrifugal separation step of centrifuging the plurality of element bodies to be treated while being accommodated in the surface treatment jig, and removing a part of the surface treatment liquid;
A heat treatment step of heat treating the surface treatment liquid;
A surface treatment method comprising:   In the element storing step, the element to be processed is inserted into the opening of the partition part, and at least one edge of the element to be processed is brought into contact with at least one point of the partition part. The surface treatment method according to claim 3, wherein the element to be treated is supported.   The surface treatment method according to claim 3 or 4, wherein the element to be treated is a metal magnet.

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