CN102775146A - Magnetic shoe for motor and manufacturing method thereof - Google Patents
Magnetic shoe for motor and manufacturing method thereof Download PDFInfo
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- CN102775146A CN102775146A CN2012102781800A CN201210278180A CN102775146A CN 102775146 A CN102775146 A CN 102775146A CN 2012102781800 A CN2012102781800 A CN 2012102781800A CN 201210278180 A CN201210278180 A CN 201210278180A CN 102775146 A CN102775146 A CN 102775146A
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- magnetic shoe
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Abstract
The invention provides a magnetic shoe for a motor and a manufacturing method thereof. The magnetic shoe for a motor is prepared from the following raw materials in percentage by mass: 80-95% of iron powder, 3-15% of magnetic shoe grinder material and 2-5% of waste magnetic shoe powder. The invention lowers the final cost by about 50%, and enhances the Hcj value of the product on the premise of ensuring the Hcb value of the product; the product performance can achieve and exceed the requirements of the customer, and the performance uniformity of the improved product and the stability of the motor are greatly enhanced; and thus, the invention greatly lowers the rejection ratio of the product, improves the intensity and density uniformity of the magnetic shoe, enhances the magnetic remanence and coercive force of the magnetic shoe, and enhances the applicability of the motor.
Description
Technical field
The invention belongs to the magnetic shoe field, specifically is that a kind of motor is with magnetic shoe and method of manufacture thereof.
Background technology
Along with the continuous development of permanent magnet material and power electronic devices, permanent magnetism The Application of Technology scope is increasingly extensive, and it can be used on home appliance, computingmachine, motorbus, train even the military land special bus.Common motor is not high enough with magnetic shoe Hcj, and the magnetic shoe insufficient strength is high, and density uniformity is good inadequately, and the product scrap rate is high, can not satisfy the needs to the demanding product of motor performance such as undersea boat.
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Summary of the invention
In order to solve the problems of the technologies described above, the invention provides a kind of motor with magnetic shoe and method of manufacture thereof.
A kind of motor is used magnetic shoe, it is characterized in that its raw material by following mass percent processes: iron powder 80%-95%; Magnetic shoe gridner material 3%-15%; Useless magnetic shoe powder 2%-5%.
Described motor is used magnetic shoe, it is characterized in that its raw material by following mass percent processes: iron powder 90%; Magnetic shoe gridner material 7.5%; Useless magnetic shoe powder 2.5%.
Described motor is characterized in that comprising the steps: with the method for manufacture of magnetic shoe
The weight ratio of 1) raw material, steel ball, water being pressed 1:3:1.2 drops into ball milling in 2 tons of roller ball mills;
2) add 0.4% ~ 0.8% CaCO according to the weight ratio of raw material
3, 0.2% ~ 0.4% Al
2O
3, 0.3% ~ 0.6% SrCO
3, 0.5% ~ 0.8% Cr
2O
3, 0.4% ~ 0.7% SrSO
4
3) fed intake 16 hours after, change the steel ball of ball milling into diameter 6mm, add 0.2% boric acid according to the weight ratio of raw material, carry out secondary ball milling;
4) secondary ball milling detected the performance of slip, discharging after granularity reaches 0.75 ± 0.02 μ m after 8 hours;
5) the discharging postprecipitation made water cut at 30%-35% more than 36 hours, under the condition of magnetic field 13Kqe, pressure 18-19mpa, press time 80s, carried out the moulding compacting;
6) blank after the moulding compacting dries and gets into the kiln sintering more than 48 hours, and through kiln discharge after the steps such as oven dry, intensification, high temperature, cooling, insulation, wherein design temperature is 1138 ℃ ± 5 ℃ in the high-temperature step;
7) mill processing, cleaning, check, warehouse-in.
Described motor is used magnetic shoe, it is characterized in that described iron powder is MGC 35 models.
Described motor is used magnetic shoe, it is characterized in that step 2) in add 0.6% CaCO
3, 0.3% Al
2O
3, 0.45% SrCO
3, 0.65% Cr
2O
3, 0.55% SrSO
4
Described motor is used magnetic shoe, it is characterized in that in the step 6) that design temperature is 1138 ℃ in the high-temperature step.
Main improvement of the present invention is following:
1, change main material into employing MGC 35 material by the DM4040 material, the price in DM4040 material market is about 9000-9500 unit, and the price in MGC 35 material markets is about 4300-4600 unit, and cost has reduced about 50%;
2, will originally do the grinding machine material of scrap handling, useless watt grain weight newly is utilized in the main material, changes the activity of slip, reduces the magnetic cohesion of product, strengthens orientations, reduces the scrap rate of moulding greatly.Make product when improving the Br value, guarantee the Hcj value, and when reducing cost, strengthen the stability of performance of products;
3, in addition, in prescription, add conventional small powders such as CaCO3, Al2O3, SrCO3, Cr2O3, SrSO4.Magnetic shoe all can at first adopt rare earth materials such as adding lanthanum, cobalt when considering additive in the past, and the main effect of examples of such additives is the overall performance that improves product, but REE is very strong to the susceptibility of temperature; Exceed under certain temperature or the not good enough state of sintering weather, be easy to reflect, it is bigger to make that the deviation of performance appears in product; The too high meeting of temperature makes obviously declines such as Hcj value; Temperature is crossed to hang down and can be made the reflection of product incomplete, and Br can not embody, and the temperature domain of walker is very narrow.
And adding conventional small powders such as CaCO3, Al2O3, SrCO3, Cr2O3, SrSO4, CaCO3 wherein and SrCO3 can improve the Br value of product, improve the Hcj value of product when Al2O3 can guarantee product Hcb value, have promoted the agglomerating TR more.Performance of products is effective, and, has promoted the work-ing life of product because the changing function of portions additive has increased density of product.
4, common product all is the whole mechanical milling process of disposable completion in the ball milling operation.Because this project research and development product is very high for the requirement of Hcj value, so through making the ball milling operation of this product into secondary ball milling after testing several times, key step is:
(1) ball milling makes the steel ball in the ball milling into diameter 6mm by original diameter 8mm after the regular hour,
(2) when secondary ball milling, add a certain amount of boric acid.
The change of steel ball mainly is a homogeneity of strengthening the slip granularity, and boric acid mainly is to play dissemination, and the viscosity of slip is weakened, and is prone to draw water.Through this twice measure, thereby reduce the race material phenomenon of molding procedure, reduced the difficulty of moulding, improved the qualification rate of moulding.In addition, because boric acid is in secondary ball milling, to add, boric acid plays abundant effectiveness in the process of ball milling, the Br value of product is improved but also the Hcj value of product has been played conclusive booster action.
5, change forming mould:
What (1) forming mould of original product used all is alloy steel materials, and coil is a copper cash.Existing change formed coil into the copper pipe material, the peripheral stainless steel iron sheet shell that adopts, the water cycle cooling, the magnetic field of setting when the improvement through these several measures makes moulding is not influenced by peripheral environment (temperature and humidity);
(2) make Mould design into the square type by original saddle-shape, because the magnetic field of square type, magnetic property is fully utilized after installation, and stabilized (steady-state) speed has been avoided noise, reduces the electric current that motor uses, and has increased the work-ing life of product greatly.
6, adjustment sintering temperate zone on the sintering process changes sintering time.Original high-performance, low temperature, jogging speed are changed over high-performance high temperature method fast, save the product agglomerating time, improve the effect of oxidizing reaction.The temperature of high-temperature zone was 1105 degree when original prescription was set, and fluctuated to be merely about 2 degree, and the agglomerating time is 20 minutes/car, and the temperature that the prescription after the improvement is set the high-temperature zone is 1138 degree, and fluctuating reaches about 5 degree, and the agglomerating time is 16 minutes/car.Like this temperate zone curve is adjusted, not only effectively kept product performance, and saved the sintering time of product, improved production capacity.
A kind of motor of the present invention is used magnetic shoe, and final cost has descended about 50%, improves the Hcj value of product when guaranteeing product Hcb value; Not only performance can reach and exceed requirement of client, and the product after improving more originally had greatly on the stability of consistency of performance and installation rear motor and promote, and reduces the product scrap rate greatly; Improve magnetic shoe intensity and density uniformity; Simultaneously, improve the remanent magnetism and the coercive force of magnetic shoe, strengthened the usability of motor.
Embodiment
Embodiment 1
1, with MGC 35 model major ingredient iron powders and useless magnetic shoe powder, Magnetic shoe gridner material (iron powder 90%; Magnetic shoe gridner material 7.5%; Useless magnetic shoe powder 2.5% amounts to 1.5T), steel ball (4.5T), water put in 2 tons of roller ball mills according to the part by weight of 1:3:1.2, adds 0.6% CaCO according to the weight ratio of raw material
3, 0.3% Al
2O
3, 0.45% SrCO
3, 0.65% Cr
2O
3, 0.55% SrSO
4
2, fed intake 16 hours after, change the steel ball of ball milling into diameter 6mm model, than the boric acid that adds 0.2% amount, carry out secondary ball milling according to raw material weight.Behind the secondary ball milling 8 hours, detect the performance of slip, after granularity reaches 0.75 ± 0.02 μ m, get final product discharging; Discharging was accomplished deposition more than 36 hours, and water cut generally can be carried out the moulding compacting about 30%-35%;
3, according to single requirement of technology magnetic field 13KQe, pressure 18-19mpa, press time 80s are set, carry out the moulding compacting with this understanding, the blank after moulding is accomplished need dry and get into the kiln sintering more than 48 hours;
4, the product dress base of moulding being accomplished advances kiln, through kiln discharge (the high-temperature zone design temperature is 1138 ± 5 °) again behind oven dry-intensification-high temperature-cooling-passages such as insulation;
5, grind processing by the grinding machine workshop according to the processing requirement (size, angle etc.) of product regulation again;
6, clean at last, after the assay was approved warehouse-in.
Through experiment, the magneticstrength of the magnetic shoe that embodiment 1 prepares is as shown in table 1:
Magnetic shoe magneticstrength that table 1 embodiment 1 makes and ordinary process contrast table
| Technology | Sintering temperature | Magneticstrength |
| Common | 1105℃±5℃ | 9000－10000 Oe |
| Embodiment 1 | 1138℃±5℃ | 13000 Oe |
Can find out the magneticstrength of the magnetic shoe that the magnetic shoe magneticstrength that the inventive method prepares prepares apparently higher than ordinary process from table 1.
The above is merely preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of within spirit of the present invention and principle, being done, is equal to and replaces and improvement etc., all is included within protection scope of the present invention.
Claims (6)
1. a motor is used magnetic shoe, it is characterized in that its raw material by following mass percent processes: iron powder 80%-95%; Magnetic shoe gridner material 3%-15%; Useless magnetic shoe powder 2%-5%.
2. motor as claimed in claim 1 is used magnetic shoe, it is characterized in that its raw material by following mass percent processes: iron powder 90%; Magnetic shoe gridner material 7.5%; Useless magnetic shoe powder 2.5%.
3. according to claim 1 or claim 2 motor is characterized in that comprising the steps: with the method for manufacture of magnetic shoe
The weight ratio of 1) raw material, steel ball, water being pressed 1:3:1.2 drops into ball milling in 2 tons of roller ball mills;
2) add 0.4% ~ 0.8% CaCO according to the weight ratio of raw material
3, 0.2% ~ 0.4% Al
2O
3, 0.3% ~ 0.6% SrCO
3, 0.5% ~ 0.8% Cr
2O
3, 0.4% ~ 0.7% SrSO
4
3) fed intake 16 hours after, change the steel ball of ball milling into diameter 6mm, add 0.2% boric acid according to the weight ratio of raw material, carry out secondary ball milling;
4) secondary ball milling detected the performance of slip, discharging after granularity reaches 0.75 ± 0.02 μ m after 8 hours;
5) the discharging postprecipitation made water cut at 30%-35% more than 36 hours, under the condition of magnetic field 13Kqe, pressure 18-19mpa, press time 80s, carried out the moulding compacting;
6) blank after the moulding compacting dries and gets into the kiln sintering more than 48 hours, and through kiln discharge after the steps such as oven dry, intensification, high temperature, cooling, insulation, wherein design temperature is 1138 ℃ ± 5 ℃ in the high-temperature step;
7) mill processing, cleaning, check, warehouse-in.
4. motor as claimed in claim 1 is used magnetic shoe, it is characterized in that described iron powder is MGC 35 models.
5. motor as claimed in claim 3 is used magnetic shoe, it is characterized in that step 2) in add 0.6% CaCO
3, 0.3% Al
2O
3, 0.45% SrCO
3, 0.65% Cr
2O
3, 0.55% SrSO
4
6. motor as claimed in claim 3 is used magnetic shoe, it is characterized in that in the step 6) that design temperature is 1138 ℃ in the high-temperature step.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102781800A CN102775146A (en) | 2012-08-07 | 2012-08-07 | Magnetic shoe for motor and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102781800A CN102775146A (en) | 2012-08-07 | 2012-08-07 | Magnetic shoe for motor and manufacturing method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN102775146A true CN102775146A (en) | 2012-11-14 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012102781800A Pending CN102775146A (en) | 2012-08-07 | 2012-08-07 | Magnetic shoe for motor and manufacturing method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106699157A (en) * | 2016-12-28 | 2017-05-24 | 常州市金坛磁性材料有限公司 | Process for preparing permanent magnetic ferrite through two-stage ball milling and mixture |
| CN106975987A (en) * | 2017-03-21 | 2017-07-25 | 横店集团东磁股份有限公司 | A kind of not uniform thickness ferrite magnetic shoe and preparation method thereof |
| CN113541338A (en) * | 2021-06-04 | 2021-10-22 | 南京溧水金洪磁性元件有限公司 | Magnetic shoe for motor and manufacturing method and manufacturing device thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101599331A (en) * | 2009-04-16 | 2009-12-09 | 重庆凌达实业有限公司 | Permanent ferrite magnetic tile and preparation method thereof |
| CN101860091A (en) * | 2010-04-26 | 2010-10-13 | 马鞍山市鑫洋永磁有限责任公司 | Preparation method for rare earth permanent ferrite magnetic shoe and product |
| CN102515735A (en) * | 2011-12-06 | 2012-06-27 | 东阳市双洋电机磁瓦有限公司 | Method for preparing motor magnetic tile with good performance |
| CN102515734A (en) * | 2011-12-06 | 2012-06-27 | 东阳市双洋电机磁瓦有限公司 | Preparation method of motor magnetic tile |
-
2012
- 2012-08-07 CN CN2012102781800A patent/CN102775146A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101599331A (en) * | 2009-04-16 | 2009-12-09 | 重庆凌达实业有限公司 | Permanent ferrite magnetic tile and preparation method thereof |
| CN101860091A (en) * | 2010-04-26 | 2010-10-13 | 马鞍山市鑫洋永磁有限责任公司 | Preparation method for rare earth permanent ferrite magnetic shoe and product |
| CN102515735A (en) * | 2011-12-06 | 2012-06-27 | 东阳市双洋电机磁瓦有限公司 | Method for preparing motor magnetic tile with good performance |
| CN102515734A (en) * | 2011-12-06 | 2012-06-27 | 东阳市双洋电机磁瓦有限公司 | Preparation method of motor magnetic tile |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106699157A (en) * | 2016-12-28 | 2017-05-24 | 常州市金坛磁性材料有限公司 | Process for preparing permanent magnetic ferrite through two-stage ball milling and mixture |
| CN106975987A (en) * | 2017-03-21 | 2017-07-25 | 横店集团东磁股份有限公司 | A kind of not uniform thickness ferrite magnetic shoe and preparation method thereof |
| CN113541338A (en) * | 2021-06-04 | 2021-10-22 | 南京溧水金洪磁性元件有限公司 | Magnetic shoe for motor and manufacturing method and manufacturing device thereof |
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Application publication date: 20121114 |