JPH04290574A - Cleaning device of rare earth magnet - Google Patents

Abstract

PURPOSE:To improve the cleaning capacity and to form a rigid coating film without generating rust on the work by supplying and aligning the work on a cleaning mesh with an aligning machine, conveying to a cleaning tank and a rust preventing solution tank, draining, discharging from the mesh after drying and cycling the mesh. CONSTITUTION:The cleaning mesh is made from stainless steel and the wire is attached slantly to the discharge direction of the work. The aligning machine 2 is provided by slanting the vibration plate 22 of a troughing form of electromagnetic vibration feeder 29. At the bottom place of the vibration plate 22, a chevron form of silicone rubber made sheet 23 is provided and the ridgeline is made parallel to the supply direction of the work 9. At the tip of the vibration plate 22, a nylon made rotary roll brush 24 rotating in the direction opposite to the supply direction of the work 9 is provided and the gap T between the brush 24 and the ridgeline of the mountain of the sheet 23 is freely adjusted 1.0-1.5 times as much as the thickness of the work 9. Besides the rust preventing solution is filled in the vibration plate 22 and the work 9 is supplied and aligned on the cleaning mesh in the rust preventing solution. After conducting supersonic cleaning with city water, it is immersed in tire rust preventing solution.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] The present invention relates to a device for cleaning rare earth magnets as a pre-painting treatment.

0002

BACKGROUND OF THE INVENTION As a pre-painting treatment for rare earth magnets, the surface of the object to be coated is cleaned and degreased after processing in order to ensure a strong coating film.

For example, in commonly performed ultrasonic cleaning, workpieces are arranged in a single layer on a cleaning wire mesh in order to obtain uniform cleanliness. However, with the equipment that supplies the workpieces to the cleaning wire mesh, it is difficult for the workpieces to line up in a single layer, making it inefficient, so the workpieces have to be lined up manually. Shot blasting, high-pressure water cleaning, and air blasting are also used, but if the workpiece is small, it is necessary to hold down the workpiece, and cleaning of the holding part is insufficient, resulting in uneven cleanliness. Cleaning using adhesive rollers and brushes is also used, but the processing capacity is low.

[0004] Furthermore, JP-A-1-262966 discloses that degreasing and cleaning is performed with water at 70° C. to 100° C. as a pretreatment step for painting. However, in the case of rare earth magnets, which are made of materials that are extremely susceptible to rust, they are activated by high-temperature hot water and easily form an oxidized layer, causing the problem that the paint film on the workpiece peels off along with the oxidized layer. . There is also a method of using 1,1,1,-trichloroethane for degreasing, but its use is being restricted due to international environmental concerns.

[0005]

[Problems to be Solved by the Invention] The present invention solves the problems of the prior art described above, improves cleaning performance, forms a strong coating film without causing rust on the workpiece, and
The purpose of the present invention is to provide a rare earth magnet cleaning device that does not cause environmental problems and is capable of mass processing.

[0006]

[Means for Solving the Problems] The present invention uses a cleaning wire mesh in a cleaning device for cleaning residues and oils and fats after processing rust-prone and brittle workpieces such as rare earth magnets, and for firmly applying a coating film. , an alignment machine that feeds the workpieces, a conveyance machine that transports the cleaned wire mesh to the cleaning layer and the antirust solution tank, a draining device that removes excess antirust solution from the surface of the workpieces, and a drying device that quickly dries the workpieces after draining. , consists of a discharge device that discharges dried workpieces from the cleaning wire mesh, a workpiece tray that stocks the discharged workpieces, and a stock conveyor that returns and circulates the empty cleaning wire mesh after the workpieces are discharged to the alignment machine. It is characterized by

The cleaning wire mesh for cleaning the workpiece is made of stainless steel to prevent rusting, and the wire mesh is plain-woven so that the workpiece can be smoothly discharged into the workpiece receiving tray by the workpiece discharge device. Attach it diagonally to the

[0008] In order to feed the workpieces to the cleaning wire mesh so that the workpieces do not overlap, the diaphragm of the electromagnetic vibrating feeder is installed at an angle, and a wavy silicon plate is installed at the bottom to prevent the workpieces from adhering to the diaphragm. A rubber sheet is provided so that the ridgeline of the mountain is parallel to the workpiece supply direction, and a nylon rotating roll brush is provided at the tip of the diaphragm, which rotates in the opposite direction to the workpiece supply direction. , set the distance between the tip of the brush and the ridgeline of the sheet to 1.0 to 1.5 of the workpiece thickness.
Make it twice as adjustable.

Furthermore, during the waiting period before being placed in the cleaning tank, the diaphragm of the aligning machine is filled with an anti-corrosion liquid to prevent the processed workpieces from coming into contact with the air and rusting. Clean and arrange the feed on the wire mesh.

[0010] In the cleaning tank and the anti-corrosion liquid tank, the workpieces lined up on the cleaning wire mesh are cleaned by ultrasonic waves in tap water to remove them, and then immersed in the anti-rust liquid to coat the surfaces with the anti-rust liquid. Make it adhere.

[0011] Ultrasonic vibrators are disposed at the upper and lower parts of the cleaning tank, and the work is ultrasonically cleaned from above and below while being oscillated up and down on the cleaning wire mesh by a swinging mechanism.

[0012] The rust preventive liquid contains a low-foaming nonionic surfactant, an organic rust preventive agent, borates, a fatty acid-based solubilizer, and an anti-corrosion agent in order to enable painting while the rust preventive liquid remains attached to the surface of the workpiece. It is a rust preventive agent that contains a polar organic compound such as a rust agent, with the polar group facing the metal side, that is, the work side, and the organic group facing the outside, so that it has so-called undercoating properties, and has a pH of 6.5 to 9.0. The liquid concentration is from 0.5% to 3.0%.

The draining device is provided with air nozzles at the top and bottom of the cleaning wire mesh in order to accelerate the drying of the work immersed in the rust preventive solution, and the upper air nozzle is installed so that the work on the cleaning wire mesh remains stationary. Make the opening area and air flow rate larger than the lower air nozzle, and make the air blowing direction oblique.

[0014] The work discharge device tilts the cleaning wire gauze and slides the dried work into the work receiving tray. At this time, to prevent the workpiece from being chipped due to collision between the workpiece and the workpiece tray, the center part of the workpiece tray is made into a conical shape.
The material is resin.

[0015]

Embodiments Examples of the present invention will be described in detail with reference to FIGS. 1 to 10. FIG. 1 shows the entire cleaning device. A sorting machine 2 is provided to supply workpieces to the cleaning wire mesh 1, and a first cleaning tank 41 and a second cleaning tank 42 are installed adjacent to the outlet of the sorting machine 2.
, a rust prevention liquid tank 43 is provided. A conveyor 3 for conveying the cleaning wire mesh 1 is provided above the first cleaning tank 41, the second cleaning tank 42, and the antirust liquid tank 43. A drainer 5 and a dryer 6 are provided adjacent to the outlet of the antirust liquid tank 43. Furthermore, a work discharge device 7, a work receiving tray 10, and a stock conveyor 8 are provided in the middle of transferring the cleaning wire mesh 1 from the outlet of the drying device 6 to the aligning machine 2.

FIG. 2 shows a view of the cleaning wire mesh 1 shown in FIG. 1 in the direction of arrow G. A stainless steel plain-woven wire mesh 12 selected so that the work 9 does not fall through the stitches is attached to the frame 11 so that the wires constituting the wire mesh 12 form an intersecting angle of 45 degrees with respect to the work discharge direction F1.

FIG. 3 shows the arrow view A-A in FIG. Frame 11
A tapered member 11A is attached to the work discharge side.

FIG. 4 shows a view of the alignment machine 2 in FIG. 1 in the direction of arrow H. Electromagnetic vibration feeder 21 with inclination angle Y set to approximately 6 degrees
A trough-shaped diaphragm 22 is provided, and anti-rust liquid 27 is always filled through a valve 28 so as to overflow from the tip of the diaphragm 22. At the lower part of the diaphragm 22, an elastic sheet 23 made of silicone rubber in the shape of a mountain wave is provided so that the ridgeline of the mountain is parallel to the traveling direction F2 of the workpiece 9. At the tip of the diaphragm 22 in the traveling direction F2, there is a space T from the peak of the mountain-wavy sheet 23 in the direction opposite to the traveling direction F2 of the workpiece 9, as shown in the B-B arrow view in FIG. Even when the rotating roll brush 24 rotates in the R direction and the amplitude of the diaphragm 22 changes via the driving device 26 of FIG.
The distance T from the circumferential surface of the workpiece is 1.0 to 1.0 times the thickness of the workpiece.
A bolt 25 is provided to adjust the number of times to 5 times so that it is always constant.

FIG. 6 shows the first cleaning tank 41 and the second cleaning tank 42.
, shows a side view of the rust prevention liquid tank 43. The first cleaning tank 41 is filled with tap water 44, and the lower part of the first cleaning tank 41 has a frequency of 2.
An ultrasonic transducer 46 having a frequency of 8 kHz to 45 kHz is provided. Furthermore, a cleaning wire mesh 1 is provided on the top of the ultrasonic transducer 46.
A hook 48 for holding the ultrasonic wave and an air cylinder 47 having a stroke of 1/2 or more of the wavelength of the ultrasonic wave are provided. The second cleaning tank 42 is filled with clean water 44, and an ultrasonic vibrator 46 having a frequency of 28 kHz to 45 kHz is provided above the second cleaning tank 42. Further, a hook 48 for holding the cleaning wire mesh 1 below the ultrasonic vibrator 46 and an air cylinder 47 having a stroke of 1/2 or more of the wavelength of the ultrasonic wave are provided. The rust preventive liquid tank 43 contains a liquid having a pH of 6.5 to 9.0 and containing a low foaming nonionic surfactant, an organic rust preventive agent, borates, a fatty acid solubilizer, and a preservative. concentration is 0
．． Fill with anti-corrosion liquid that is 5% to 3.0% and wash the wire mesh 1
A pedestal 49 for holding the is provided. FIG. 7 shows C-C in FIG.
A cross-sectional view is shown. The hook 48 holds the end of the cleaning wire mesh 1.

FIG. 8 shows a view of the draining device 5 in FIG. 1 in the direction of arrow J. A slit with a length similar to the width of the cleaning wire mesh 1, a width of 3.5 mm, and an air flow rate of 5 mm is placed on the top of the workpiece.
The air nozzle 51 has a speed of 5 m/min and a slit width of 1 m.
m, and the air flow velocity is 40 m/min.
2, the angle X that the air blowing direction makes with the traveling direction F4 of the workpiece 9 is approximately 60 degrees, the distance L1 between the upper surface of the workpiece and the air nozzle 51 is 40 mm, and the distance L2 between the lower surface of the workpiece and the air nozzle 52. is 10 mm. FIG. 9 shows a view taken along the line DD in FIG.

FIG. 10 shows a view of the work discharge device 7 and the work receiving tray 10 in FIG. 1 in the direction of arrow K. An air cylinder 72 is provided on the back side of the inclined table 71 that holds the cleaning wire mesh 1. A chute 73 is provided so that when the cleaning wire mesh 1 is tilted, it comes into contact with the tapered member 11A in the work discharge direction F5, and the tip of the chute 73 is connected to the cone of the work receiving tray 10 made of resin and having a conical central part. It is provided near the section 101. Further, a rotating device 110 is provided at the bottom of the work receiving tray 10.

Next, the operation will be explained. In FIG. 1, a workpiece 9 is supplied to a cleaning wire mesh 1 by an alignment machine 2,
Using the conveyor 3, the cleaning wire mesh 1 is sequentially conveyed to the first cleaning tank 41, the second cleaning tank 42, and the antirust liquid tank 43, subjected to ultrasonic cleaning and antirust treatment, and then transported to the draining device 5. . A draining device 5 removes excess rust preventive liquid from the surface of the workpiece, and a drying device 6 quickly dries the workpiece. Then, the workpiece discharging device 7 discharges the dried workpieces from the cleaning wire mesh 1 and removes them from the workpiece receiving tray 1.
Move to 0. After the work is discharged, the empty cleaning wire mesh 1 is returned to the alignment machine 2 by the stock conveyor 8.

In FIG. 2, since the material of the wire mesh 12 is stainless steel, rust does not occur and the cleaning quality is stable over a long period of time. Furthermore, since the wire mesh 12 is installed obliquely with respect to the workpiece discharge direction F1, when the workpiece discharger 7 tilts the cleaning wire mesh 1 and slides the workpiece 9 on the wire mesh 12 and discharges the workpiece 9, the corners of the workpiece 9 can be easily removed. The part moves without being caught in the stitches, and the workpiece 9 in the frame 11 in FIG. 3 is discharged in the direction F1.
The tapered member 11A on the side allows for smooth discharge.

In FIG. 4, the workpiece 9 submerged in the anticorrosion liquid 27 moves to the tip of the diaphragm 22 via the top surface of the undulating sheet 23 at the bottom of the diaphragm 22. As shown in FIG. At this time, the work 9 is attached to a mountain wave-shaped sheet 23 provided at the lower part of the diaphragm 22.
Since the contact resistance between the mountain wave-like sheet 23 and the workpiece 9 is small, and the space of the contact surface is large,
The workpiece 9 does not come into close contact with the surface of the wavy sheet 23,
It can be easily moved to the tip of the diaphragm 22.

Next, the moved workpiece 9 is placed at an adjusted distance T from the top surface of the wavy sheet 23 using the adjustment bolt 25, which is approximately 1.2 times the thickness of the workpiece 9. 9 in the R direction, which is the opposite direction to the direction of movement F2, through the drive device 26, at a rotational speed of about 100 to 200 r. p. m.
A rotating roll brush 24 made of nylon with a wire diameter of 0.3 mm and an outer diameter of 100 mm rotates in the direction of movement F2 of the workpieces 9 to move workpieces 9 into close contact with each other or overlapped workpieces 9 due to avalanche of workpieces 9. Play in the opposite direction,
The diaphragm 22 is brushed off, leveled in one step, and passed through the interval T.
The rust preventive liquid 27 slides down the chute and is supplied to the cleaning wire mesh 1 along with the overflow rust preventive liquid 27. Since these series of supplies are always processed in the rust preventive liquid, rust may occur due to drying of the workpiece 9 after processing, or the rust preventive liquid 27
serves as a buffer, so that chips, cracks, and cracks do not occur due to direct contact between the works 9.

In FIG. 6, the cleaning wire mesh 1 containing the workpiece 9 is held by a hook 48 provided in the first cleaning tank 41, and the hook 48 is held in the tap water 44 filled in the first cleaning tank 41. An air cylinder 47 provided at the top moves the distance of 1/2 or more of the wavelength of the ultrasonic wave in the direction F in which the ultrasonic wave is transmitted.
3, while swinging, the ultrasonic vibrator 46 cleans the lower and side surfaces of the workpiece 9. Next, the cleaning wire mesh 1 is transferred from the first cleaning tank 41 to the second cleaning tank 4 using the conveying device 3 in FIG.
Move to 2. The cleaning wire mesh 1 is held by a hook 48 provided in a second cleaning tank 42, and in the clean water 44 filled in the second cleaning tank 42, an air cylinder 47 installed above the hook 48 is used to absorb 1 of the ultrasonic wavelength. The top and side surfaces of the workpiece 9 are cleaned by the ultrasonic vibrator 46 while swinging a distance of /2 or more in the direction F3 in which the ultrasonic waves are transmitted. As a result, the entire surface of the workpiece can be covered without being affected by the uneven intensity of cavitation in the direction F3 in which the ultrasonic waves are transmitted.
Can be cleaned evenly and in a short time.

Next, the cleaning wire mesh 1 is transferred from the second cleaning tank 42 to the antirust liquid tank 43 using the conveying device 3 shown in FIG. Cleaning wire mesh 1
is held on a pedestal 49 provided in a rust preventive liquid tank 43, and the clean water on the surface of the workpiece 9 is replaced with the rust preventive liquid 45 with the rust preventive liquid 45 filled in the rust preventive liquid tank 43. This prevents the workpiece 9 from rusting after drying, and even if degreasing and cleaning with 1,1,1-trichloroethane is omitted, the workpiece 9 can be painted with the anticorrosive liquid still attached.

Next, using the conveying device 3 shown in FIG. 1, the cleaned wire mesh 1 is transferred from the antirust liquid tank 43 to the draining device 5. In FIG. 8, the cleaning wire mesh 1 is moved in the F4 direction at a speed of about 6 mm/sec. By blowing air from the air nozzle 51 above the workpiece 9 on the cleaning wire mesh 1 and the air nozzle 52 at the lower part, excess antirust liquid on the surface of the workpiece 9 is removed and drying of the workpiece 9 is promoted. At this time, due to the mutual relationship between the slit width of the air nozzle 51 and the air nozzle 52 and the air flow rate, water can be drained in a short time while keeping the workpiece 9 stationary.

Next, the washed wire mesh 1 after draining is passed through a drying device 6 such as a hot air circulation system shown in FIG. 1, and the surface of the workpiece 9 is
Dry quickly.

In FIG. 10, the cleaning wire mesh 1 is placed on the inclined table 71 of the work discharge device 7, the inclined table 72 is tilted by the air cylinder 72, the work 9 is slid down in the direction F5, and is discharged. The workpiece 9 is slid down the upper surface of the chute 73 and hits the conical part 101 of the workpiece receiving tray 10,
It is dispersed in the lower part 102. At this time, when the workpiece tray 10 is rotated in the F6 direction, the workpiece 9 is transferred to the workpiece tray 1.
Evenly distributed in the lower part 102 of 0. Thereby, the dried workpiece 9 can be discharged from the cleaning wire mesh 1 to the workpiece receiving tray 10 without chipping, cracking, or cracking.

In this embodiment, the shape of the work 9 is as follows.
Although the rectangular shape has been described, for flat round, flat polygonal, and perforated products, the inclination angle Y and interval T of the aligning machine 2 in FIG. 4, the air nozzle angle By adjusting the distances L1 and L2 from 52, the present invention can be applied without any trouble.

The material of the corrugated sheet of the workpiece aligning machine 2 is
I have described silicone rubber, but work 9 is missing,
If no breaks or cracks occur, the material of the corrugated sheet is
The present invention can be applied to materials with relatively high hardness, such as steel plates, acrylic, and plastics, without any problems.

In the first cleaning tank 41, the second cleaning tank 42, and the antirust liquid tank 43, the first cleaning tank 41 and the second cleaning tank 42 have one
Although the ultrasonic transducers 46 were provided for each tank, the present invention can be applied without any problem even if the ultrasonic transducers 46 are provided above and below in one tank. Furthermore, if an ultrasonic vibrator is provided in the anti-rust liquid tank 43, the clean water on the surface of the workpiece 9 can be replaced with the anti-rust liquid in a short time.

Although it has been described that the material of the workpiece tray is resin, the present invention can be applied to materials with relatively high hardness such as plastics and steel plates without any problem, as long as the workpiece 9 is not chipped, broken, or cracked. Applicable.

[Effects of the Invention] According to the present invention, when cleaning a fragile workpiece such as a rare earth magnet before painting, it is possible to improve the cleaning performance without causing rust on the surface of the workpiece. Forms a strong coating film and improves quality. In addition, since a rust preventive agent containing a polar organic compound is used, painting can be done without degreasing and cleaning, so degreasing equipment and 1,1,1,-trichloroethane can be omitted, eliminating environmental problems. did.

[Brief explanation of the drawing]

[Fig. 1] Overall diagram of the rare earth magnet cleaning device of the present invention

[Figure 2
】G arrow view of the cleaning wire mesh 1 in Figure 1

[Figure 3] A-A sectional view in Figure 2

[Fig. 4] H arrow view of the workpiece alignment machine 2 in Fig. 1

[Figure 5] Figure 4
BB arrow view of

FIG. 6 is a view of the first cleaning tank 41, second cleaning tank 42, and antirust liquid tank 43 in FIG.

[Figure 7] C-C sectional view in Figure 6

[Fig. 8] J arrow view of the draining device 5 in Fig. 1

[Fig. 9] D-D arrow view in Fig. 8

[Figure 10] Work discharge device 7 and work tray 10 in Figure 1
K arrow view of

[Explanation of symbols]

1. Cleaning wire mesh 2 Alignment machine 3 Conveyor machine 5 Draining device 6 Drying equipment 7 Discharge device 8 Stock conveyor 9 Work 10 Work tray 41 First cleaning tank 42 Second cleaning tank 43 Rust prevention liquid tank

Claims (10)

[Claims] Claim 1: An apparatus for cleaning rare earth magnets after processing by grinding, barrel polishing, etc., comprising: an alignment machine that feeds and aligns workpieces to a cleaning wire mesh for transporting the workpieces; a cleaning tank that connects the cleaning wire mesh to a cleaning tank; A conveyance machine that transports the workpiece to a tank filled with rust prevention liquid, a draining device that removes excess rust prevention liquid from the surface of the workpiece, a drying device that dries the workpiece, and a discharge device that discharges the workpiece from the cleaning wire mesh. A rare earth magnet cleaning device characterized by being provided with a workpiece tray for stocking discharged workpieces and a stock conveyor for circulating a cleaning wire mesh. 2. The rare earth magnet cleaning apparatus according to claim 1, wherein the material of the cleaning wire mesh is stainless steel, and the direction of the wire constituting the wire mesh is oblique to the workpiece discharge direction. 3. The rare earth magnet cleaning apparatus according to claim 1, wherein the alignment machine includes a trough-shaped electromagnetic vibration feeder and a rotating roll brush provided at the tip of the diaphragm. 4. The aligning machine has a diaphragm installed at an angle, a mountain wave-shaped sheet provided at the bottom of the sheet made of silicone rubber, the ridgeline of the mountain being parallel to the feeding direction of the workpiece, and rotating rolls. The brush is made of nylon, rotates in the opposite direction to the workpiece supply direction, and can adjust the distance between the tip of the brush and the ridgeline of the sheet crest to 1.0 to 1.5 times the thickness of the workpiece. The rare earth magnet cleaning device according to claim 3, characterized in that: 5. The apparatus for cleaning rare earth magnets according to claim 3, wherein the aligning machine stores a rust preventive liquid in a diaphragm, and supplies and aligns the workpieces to the cleaning wire mesh in the rust preventive liquid. 6. The rare earth magnet cleaning apparatus according to claim 1, wherein the work is ultrasonically cleaned with tap water and then immersed in a rust preventive solution. 7. The rare earth magnet cleaning apparatus according to claim 1, wherein the cleaning tank is provided with a mechanism for swinging the cleaning wire mesh in which the workpieces are aligned, with ultrasonic vibrators arranged in the upper and lower parts. . 8. The rust preventive liquid has a pH of 6.5 to 9.0 and contains a low foaming nonionic surfactant, an organic rust preventive agent, borates, a fatty acid solubilizer, and a preservative. 2. The rare earth magnet cleaning apparatus according to claim 1, wherein the concentration of the liquid is 0.5% to 3%. 9. The draining device according to claim 1, wherein the draining device has air nozzles at the upper and lower parts, the upper air nozzle has a larger opening area and air flow velocity than the lower nozzle, and the air blowing direction is oblique. Rare earth magnet cleaning equipment. 10. The rare earth magnet cleaning apparatus according to claim 1, wherein the work tray has a conical central portion and is made of resin.