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1. 发明专利

JPH0994814A APPARATUS FOR SUPPLYING RAW MATERIAL FOR WET-MOLDING OF RARE EARTH PERMANENT MAGNET 失效
公开(公告)号：JPH0994814A
公开(公告)日：1997-04-08
申请号：JP25237995
申请日：1995-09-29
申请人： HITACHI METALS LTD
发明人： SASAKI KENSUKE , MIKAMOTO TSUKASA
IPC分类号： B30B11/00 , B22F3/02 , B22F3/035 , B28B13/02 , H01F41/02
摘要： PROBLEM TO BE SOLVED: To supply a raw material from a die opening into a mold cavity accurately and quantitatively preventing an upper punch and a filter from contacting the upper surface of a die by supplying the raw material by a quantitative supply means while a raw material supply nozzle is in the middle of the opening of the mold cavity. SOLUTION: A die 1 is lifted to form a mold cavity 5, and a supply head 10 is moved to the middle of the die 1 by an air cylinder of a positioning device 9. When a nozzle 6 has reached the middle of an opening, the operation of a volume type pump 12 is started. The digital timer of a controller 13 is started simultaneously with the operation of the pump, and the pump is stopped after the elapse of a prescribed time. The air cylinder is brought back at the same time of the stop of the pump so that slurry adhered to the end of the nozzle 6 is scraped off into the mold cavity 5 and the nozzle 6 is closed. An upper punch equipped with a liquid discharge opening and a filter is brought down to pressurize in a magnetic field to obtain a molding.

2. 发明专利

JPH08143908A DEVICE FOR SINTERING RARE-EARTH PERMANENT MAGNET 失效
公开(公告)号：JPH08143908A
公开(公告)日：1996-06-04
申请号：JP29251894
申请日：1994-11-28
申请人： HITACHI METALS LTD
发明人： SASAKI KENSUKE , MIKAMOTO TSUKASA , YASUDA TOMOSHI
IPC分类号： B22F3/00 , B22F3/10
摘要： PURPOSE: To prevent the deposition and residence of solvent and to obtain a good rare-earth permanent magnet by heating a water jacket provided on the door of a vacuum vessel of the sintering device, the peripheral part close to the door and high and low-vacuum pipelines with steam. CONSTITUTION: A compact consisting of the fine powder for a rare-earth permanent magnet and solvent is placed in a vessel 4 and arranged in a vacuum vessel 1. The vessel 1 is evacuated to a specified vacuum by the high-vacuum evacuating device 10 and low-vacuum evacuating device 15 provided with a solvent recovery device 18, which are communicated with each other through a high-vacuum pipeline 6 and a low-vacuum pipeline 11. The compact is heated by a heater 5 to a specified temp., degreased and sintered. In the rare-earth permanent magnet sintering device, a water jacket 19 is provided to the door 2 of the vessel 1, the peripheral part of the side face close to the door, the high-vacuum pipeline 6 and the low-vacuum pipeline 11, and steam is supplied from a steam generator 22 communicated through a pipeline 23 to heat the jacket.

3. 发明专利

JPS63118030A MANUFACTURE OF PERMANENT MAGNET ALLOY 失效
公开(公告)号：JPS63118030A
公开(公告)日：1988-05-23
申请号：JP26354986
申请日：1986-11-05
申请人： HITACHI METALS LTD
发明人： SASAKI KENSUKE , SHIBUSAWA HARUTAKA
IPC分类号： H01F1/08 , B22F9/20 , C22C1/04
摘要： PURPOSE:To stabilize the composition of powdery raw material, by using a powdery raw material prepared by reduction-diffusion reaction at the time of manufacturing a rare earth-Co permanent magnet by powder metallurgy. CONSTITUTION:For example, in order to obtain raw material for an SmCo5 magnet by reduction-diffusion reaction (R/D process), respective powders of Sm2O3, Co, and further Ca as a reducing agent are weighed according to the batch size so that they form the prescribed weight ratio. Then, respective powders after weighing are uniformly mixed by means of a rotary barrel mixer, and the resulting mixture is filled into a heat treatment vessel made of stainless steel to undergo R/D reaction in a heat treatment furnace, which is passed through a washing state so as to be formed into a coarse powder as raw material. In this way, uniform mixing of raw material is attained and, as a result, composition of powdery raw material is stabilized, so that an excellent permanent magnet can be manufactured.

4. 发明专利

JPH1197223A R-FE-B SINTERED PERMANENT MAGNET 失效
公开(公告)号：JPH1197223A
公开(公告)日：1999-04-09
申请号：JP27057097
申请日：1997-09-17
申请人： HITACHI METALS LTD
发明人： UCHIDA KIMIO , TAKAHASHI MASAHIRO , TANIGUCHI FUMITAKE , MIKAMOTO TSUKASA , SASAKI KENSUKE
IPC分类号： C22C38/00 , C22C38/12 , H01F1/053 , H01F1/08 , H01F10/32
摘要： PROBLEM TO BE SOLVED: To improve the bending strength and the temperature coefficient of a magnetic property while maintaining a high magnetic property by causing the crystal grains of the main phase of an R-Fe-B sintered permanent magnet of a predetermined composition to have a predetermined grain diameter distribution and by increasing the sintered density to a value greater than a predetermined value. SOLUTION: An R-Fe-B sintered permanent magnet is obtained, which is composed of 27.0 to 31.0 wt.% of R (at least one kind of rare earth elements including Y), 0.5 to 2.0 wt.% of B, 0.25 wt.% or lower of O, 0.15 wt.% or lower of C, and the balance of Fe, and in which the sum of the areas of the crystal grains in the main phase whose crystal grain diameter is 10 μm or lower with respect to the total area of the main phase is 80% or higher, and the sum of the areas of the crystal grains in the main phase whose grain diameter is 13 μm or higher is 10% or lower, and in which the sintered density is increased to 7.60 g/cm or higher. In this case, the amount of N in the sintered body is determined by controlling the concentration of introduced N2 gas in Ar gas during pulverization, and is set to 0.02 to 0.15%.

5. 发明专利

JPH10156108A METHOD FOR THICKENING SLURRY AND APPARATUS THEREFOR 失效
公开(公告)号：JPH10156108A
公开(公告)日：1998-06-16
申请号：JP31837496
申请日：1996-11-28
申请人： HITACHI METALS LTD
发明人： MIKAMOTO TSUKASA , SASAKI KENSUKE
IPC分类号： B01D25/12
摘要： PROBLEM TO BE SOLVED: To make it possible to thicken a slurry with high accuracy by calculating the dehydration weight in accordance with density of a solid material constituting the slurry and the density of liquid, the weight and volume of the slurry before thickening and a target slurry concn. and pressurizing the slurry so as to discharge the liquid from the slurry by as much as the calculated dehydration weight component. SOLUTION: The slurry 2 before thickening is put into a slurry tank 1 and is placed on a load cell 11. The signal of the load cell 11 is inputted to a control section 4. The total weight of the slurry tank 1 housing the slurry before thickening is measured in the control section 4 and the weight of the slurry before thickening is calculated. The volume of the slurry before thickening is determined by measuring the liquid level position of the slurry. The dehydration weight is calculated in accordance with the density of the solid material constituting the slurry 2 and the density of the liquid, the weight and volume of the slurry before thickening and the target slurry concn. and the slurry 2 is so pressurized as to discharge the liquid from the slurry 2 by as much as the dehydration weight-component. Namely, the concn. of the slurry 2 operates an actuator 12 which in turn lowers a thickening head 14, thereby compressing the slurry 2.

6. 发明专利

JPH09111309A CONTINUOUS SINTERING FURNACE 失效
公开(公告)号：JPH09111309A
公开(公告)日：1997-04-28
申请号：JP27241295
申请日：1995-10-20
申请人： HITACHI METALS LTD
发明人： SASAKI KENSUKE , MIKAMOTO TSUKASA
IPC分类号： B22F3/10
摘要： PROBLEM TO BE SOLVED: To well execute the solvent moving and sintering of rare earth magnet moldings contg. a solvent. SOLUTION: Degreasing chambers 1, 2 have heating means 12, 22, 23 and vacuum discharge means 17, 27, 35, 43 and sintering chamber 3 of a furnace for molding a mixture formed by dispersing the solvent into the fine powder for rare earth permanent magnets, then continuously degreasing and sintering the moldings are successively joined by doors 6 to 8. Hermetic spaces are formed by the wall surfaces of the degreasing chambers 1, 2, the door 5 for carrying in the moldings and the door 9 for carrying out the moldings. These wall surfaces constitute surface heating elements for heating the moldings set in these hermetic spaces.

7. 发明专利

JPH01270210A ARCLIKE PERMANENT MAGNET AND MANUFACTURE THEREOF 失效
公开(公告)号：JPH01270210A
公开(公告)日：1989-10-27
申请号：JP9890588
申请日：1988-04-21
申请人： HITACHI METALS LTD
发明人： OMORI TAKEO , SASAKI KENSUKE
IPC分类号： C22C33/02 , H01F1/04 , H01F1/053 , H01F41/02
摘要： PURPOSE:To eliminate the deterioration of magnetic properties and to inexpensively manufacture an arclike permanent magnet by applying a specific load to rare earth element, transition metal, boron magnet heated to 900 deg.C or higher. CONSTITUTION:A molded piece obtained by pressure molding fine powder of composition represented by a formula 1 is cut to a thin plate. The plate is placed on a board which is not deformed at a high temperature, and sintered at 1000-1150 deg.C in an inert gas atmosphere or in vacuum. Then, the sintered plate 1 which remains as it is or lightly lapped in the thicknesswise direction of the plate lis placed on an outer diameter jig 2 having a predetermined curvature, a load having a predetermined curvature, i.e., an inner diameter jig 3 is placed on the plate 1, plastically deformed at 900-1150 deg.C, and suitably heat treated after the deformation. In the formula I, R is combination of one or more or Nb, La, etc., R' is combination of one or more of Dy, Tb, etc., wherein 0

8. 发明专利

JPH10102102A METHOD FOR SUPPLYING SLURRY 失效
公开(公告)号：JPH10102102A
公开(公告)日：1998-04-21
申请号：JP25511396
申请日：1996-09-26
申请人： HITACHI METALS LTD
发明人： ODA KAZUO , HONDA MASANORI , EBARA MASAYUKI , SASAKI KENSUKE
IPC分类号： B22F3/02 , H01F41/12
摘要： PROBLEM TO BE SOLVED: To provide a method for stably supplying slurry into a metallic forming mold by using a fixed delivery pump. SOLUTION: The slurry 1 is charged into a slurry vessel 2, and the top part of suction of a 'Moineau pump(R)' 3 is inserted to near the bottom of the slurry vessel 2. The 'Moineau pump(R)' 3 is rotated, and the production of solvent puddle in the slurry is prevented by exciting the slurry vessel 2 at the same time of supplying. On the other hand, when supplying the slurry with repeated exciting for long time, the concn. of fine powder for magnet at the tip part of suction of the 'Moineau pump(R)' is increased and at the time of executing the supplying at the same number of rotations, the supplying quantity of the fine powder for magnet into the metallic mold is gradually increased. Then, the change of this supplying quantity is taken as the height change of a formed body, and the number of rotations of the 'Moineau pump(R)' 3 is corrected from a deviation to a target value, thus the formed body having always fixed height is attained.

9. 发明专利

JPH0950932A SLURRY CONDENSING APPARATUS FOR DRY MOLDING OF RARE EARTH PERMANENT MAGNET 失效
公开(公告)号：JPH0950932A
公开(公告)日：1997-02-18
申请号：JP19943795
申请日：1995-08-04
申请人： HITACHI METALS LTD
发明人： MIKAMOTO TSUKASA , SASAKI KENSUKE
IPC分类号： B22F3/02 , H01F1/055 , H01F1/08 , H01F41/02
摘要： PROBLEM TO BE SOLVED: To prevent degradation in magnetic characteristics due to oxidation and make it possible to obtain uniform condensed slurry in a short time even if the concentration of slurry fed varies, by employing a gastight tank to which inert gas is to be introduced and that has mixing blades therein, and performing condensing using a filter at the surface of a slurry discharger. SOLUTION: The free space in a gastight tank 9 is filled with inert gas (Ar) 11 by means of a gas introducing pipe 15 from the exterior. Oxidation due to the entry of the air caused by the lowered level of slurry 8 in the gastight tank 9, is thereby prevented. In a condensing process, an outlet valve 6 is closed, and a slurry pump 7 is operated to pump slurry 8 into a filter 2. Since the outlet valve 6 is closed, the slurry 8 fills the filter 2. Additionally, the slurry 8 is pumped, and thus only solvent passes the filter 2 and is discharged. As a result, the slurry is gradually condensed. This makes it possible to obtain uniform condensed slurry in a short time even if the concentration of slurry fed varies.

10. 发明专利

JPH08181028A METHOD AND APPARATUS FOR PROCESSING RARE EARTH PERMANENT MAGNET 失效
公开(公告)号：JPH08181028A
公开(公告)日：1996-07-12
申请号：JP32053494
申请日：1994-12-22
申请人： HITACHI METALS LTD
发明人： SASAKI KENSUKE , MIKAMOTO TSUKASA
IPC分类号： B23D19/00 , B22F3/02 , H01F41/02
摘要： PURPOSE: To improve the processing capacity while preventing the decrease in the magnetic characteristics by processing the molded form of a rare earth permanent magnet while being dipped in mineral oil, synthetic oil or vegetable oil. CONSTITUTION: Before processing, a movable table 6 is lifted by a driving shaft 8 from the surface of processing solution (mineral oil, synthetic coil or vegetable oil) 2, a molded form 3 is fixed to a spacer 3 at this position, and assembled with the table 6. Then, after a working blade 4 is arrived at a predetermined rotation, the table 6 is pressed down by the shaft 8, and hence the form 3 is brought into contact with the blade 4 and cut. Cuttings generated by the cutting are transferred together with the solution 2 by a circulating pump 10 via a tube 1 to a cutting recovering unit 12. The solution 2 in which the cuttings are removed is again returned to a processing tank 1. When the cutting is completed, the table 6 is again lifted above the surface of the solution 2, and the form 3 in which the processing is finished is removed. Thus, the processing capacity can be improved while preventing the decrease in magnetic characteristics due to the reaction with oxygen.

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