CN110842205B - Permanent magnetic ferrite magnet molding boosting injection device and magnet manufacturing method - Google Patents
Permanent magnetic ferrite magnet molding boosting injection device and magnet manufacturing method Download PDFInfo
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- CN110842205B CN110842205B CN202010039854.6A CN202010039854A CN110842205B CN 110842205 B CN110842205 B CN 110842205B CN 202010039854 A CN202010039854 A CN 202010039854A CN 110842205 B CN110842205 B CN 110842205B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/22—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/24—After-treatment of workpieces or articles
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/0253—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing permanent magnets
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/0253—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing permanent magnets
- H01F41/0266—Moulding; Pressing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/24—After-treatment of workpieces or articles
- B22F2003/247—Removing material: carving, cleaning, grinding, hobbing, honing, lapping, polishing, milling, shaving, skiving, turning the surface
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Abstract
A permanent magnetic ferrite magnet forming boosting injection device and a magnet manufacturing method are disclosed, wherein the permanent magnetic ferrite magnet forming boosting injection device comprises a slurry stirring barrel, a horizontal boosting plunger pump and an injection pump, the horizontal boosting plunger pump is installed right below the slurry stirring barrel, a discharge hole in the bottom of the slurry stirring barrel is in direct connection with a discharge hole above the horizontal boosting plunger pump, and the diameter of a through hole between the discharge hole and the feed hole is more than or equal to phi 80 mm; the material injection pump is connected with a discharge pipe of the horizontal boosting plunger pump through a gate valve, and a feeding pipe of the material injection pump is connected with the magnet forming die. The invention also discloses a magnet manufacturing method by utilizing the permanent ferrite magnet molding boosting and injecting device. By utilizing the method, the batch production of the permanent magnetic ferrite magnet with the remanence B being more than or equal to 4150 Gs and the intrinsic coercive force Hcj being more than or equal to 4000 Oe can be realized under the condition of not adding rare earth elements and cobalt elements; the molding and pressing efficiency and the quality qualification rate of the permanent magnetic ferrite magnet are greatly improved.
Description
Technical Field
The invention relates to a boosting and injecting device and a magnet manufacturing method, in particular to a permanent magnetic ferrite magnet forming boosting and injecting device and a magnet manufacturing method.
Background
The permanent ferrite magnet is a common permanent magnet product, the shape of which is mostly tile-shaped, annular or square, and is mainly applied to permanent magnet motors, sound equipment and magnetic separation equipment, and the production of the permanent ferrite magnet usually comprises the following processes: (1) wet grinding the raw materials into slurry with the particle size of about 1 mu m, wherein the water content of the slurry is within the range of 34-38%; (2) pressing and dehydrating the slurry under the orientation condition of a strong magnetic field to form a green body; (3) sintering the green body at high temperature to obtain a blank; (4) and grinding and cleaning the blank to obtain a finished magnet product.
The magnetic performance is the most important performance index of the magnet, mainly comprises remanence Br and intrinsic coercive force Hcj, the permanent magnetic ferrite magnet with remanence Br more than or equal to 4150 Gs and intrinsic coercive force Hcj more than or equal to 4000 Oe at present is the most widely applied product in the industry, and the rare earth element and cobalt element are required to be added in the raw materials for producing the magnet in batch. Because the raw materials of rare earth and cobalt are expensive, the production cost of the magnet is greatly increased, and the market competitiveness of the product is greatly reduced, magnet production enterprises are all in vigorous research on production technologies without adding rare earth elements and cobalt elements.
From the theory of magnetism, two measures of further grinding the particle size of slurry and adding a dispersing agent into the slurry to improve the magnetic field orientation degree of magnetic crystal particles can theoretically improve the magnetic performance of the magnet, so that magnet production enterprises mostly develop researches in the two aspects.
Unfortunately, the difficulty of pressing and dehydration molding is greatly increased after the particle size of the slurry is ground, and when the slurry with the particle size of less than 0.7 mu m in the prior industry is used for producing the magnet, the density of a green body is easy to be low, and the blank is easy to crack after being sintered, so that the quality qualification rate of the magnet cannot be ensured; the magnetic performance of the magnet can be effectively improved by adding the dispersing agent into the slurry, but the difficulty of pressing and dehydrating the slurry is greatly increased, and the quality qualification rate of the magnet cannot be inhibited even if the pressing speed is reduced. The slurry added with the dispersing agent can only be applied to the production of a square magnet, a tile-shaped magnet with a small arched opening angle and a thin tile-shaped magnet with a small thickness, and cannot be applied to the production process of the tile-shaped magnet with a large arched opening angle and a large thickness.
There have also been attempts to reduce the difficulty of press forming the above slurries by reducing the water content of the slurry to below 30%. Fig. 4 is conventional permanent magnetic ferrite magnet shaping and annotates material device schematic diagram, because the ground paste water content is lower, the mobility of ground paste is worse, the ground paste agitator discharge gate, the gate valve passageway all has certain resistance, vacuum negative pressure (usually 0.1 MPa) in injection pump ground paste intracavity is difficult to inhale injection pump ground paste chamber from the ground paste agitator smoothly to low water content ground paste during press forming, it is unstable to lead to the ground paste volume that the injection pump pours into in the mould shaping chamber, each chamber unburned bricks weight deviation that the suppression came out often is more than 8%, the unburned bricks is through sintering, the quality percent of pass of grinding and washing back magnet is difficult to exceed 80%, the profit rate greatly reduced of product.
In addition, auxiliary devices such as a screw pump or a spiral feeding device are connected between the mixing barrel and the gate valve, and the slurry is attempted to be actively fed into the slurry cavity of the injection pump through the auxiliary devices, but the schemes do not improve the flowability of the slurry entering the auxiliary devices such as the screw pump or the spiral feeding device from the mixing barrel, and the conveying force is small, so that the slurry with low water content is difficult to enter the auxiliary devices from the mixing barrel, the auxiliary devices are easy to generate the phenomenon of 'empty feeding', and the slurry amount injected into the mold forming cavity by the injection pump is still unstable.
For the reasons, under the condition of not adopting the technology of adding rare earth elements and cobalt elements, the prior art is difficult to realize the mass production of the permanent magnetic ferrite magnet with residual magnetism Br more than or equal to 4150 Gs and intrinsic coercive force Hcj more than or equal to 4000 Oe.
Disclosure of Invention
The invention aims to solve the technical problem of overcoming the defects of the prior art and provides a permanent magnetic ferrite magnet molding boosting and injecting device and a magnet manufacturing method, wherein the permanent magnetic ferrite magnet molding boosting and injecting device can greatly improve the compression molding efficiency and the magnet quality of a magnet green body.
The technical scheme adopted for solving the technical problems is that the permanent magnetic ferrite magnet forming, boosting and injecting device comprises a slurry stirring barrel, a horizontal boosting plunger pump and an injecting pump, wherein the horizontal boosting plunger pump is arranged under the slurry stirring barrel, a discharge hole in the bottom of the slurry stirring barrel is directly connected with a feed inlet above the horizontal boosting plunger pump, the diameter of a through hole between the discharge hole and the feed inlet is more than or equal to phi 80mm, and slurry enters the feed inlet of the horizontal boosting plunger pump under the action of self gravity; the material injection pump is connected with a discharge pipe of the horizontal boosting plunger pump through a gate valve, and a feeding pipe of the material injection pump is connected with the magnet forming die.
Further, the horizontal boosting plunger pump is provided with a horizontal boosting plunger pump slurry cavity and a horizontal boosting plunger arranged in the horizontal boosting plunger pump slurry cavity, the horizontal boosting plunger pump is provided with a horizontal boosting plunger pump propelling cylinder oil inlet pipe and a horizontal boosting plunger pump returning cylinder oil inlet pipe, and a feed inlet is formed in the upper side of the horizontal boosting plunger pump slurry cavity.
Further, the material injection pump is provided with a slurry cavity, a piston is arranged in the slurry cavity of the material injection pump, and an oil inlet pipe of a material injection pump propelling cylinder and an oil inlet pipe of a material injection pump returning cylinder are arranged on the outer side of the material injection pump.
Further, a discharge hole in the bottom of the slurry stirring barrel is directly connected with a feed inlet of the horizontal boosting plunger pump through a flange.
Further, a discharge hole in the bottom of the slurry stirring barrel is directly connected with a feed inlet of the horizontal boosting plunger pump through a rubber tube.
Furthermore, the horizontal boosting plunger pump and the material injection pump are hydraulic control pumps.
The method for manufacturing the magnet by using the permanent ferrite magnet molding boosting and injecting device comprises the following steps:
(1) molding: adopting permanent magnetic ferrite slurry as a raw material, actively pushing the slurry into a slurry cavity of an injection pump by using a horizontal boosting plunger pump arranged below a slurry stirring barrel, and injecting the slurry in the slurry cavity into a forming die through an injection pipe by using the injection pump for forming to obtain a formed green body;
(2) and (3) sintering: placing the molded green body obtained in the step (1) into a sintering kiln for sintering to obtain a magnet blank;
(3) grinding and cleaning: and (3) grinding the magnet blank obtained in the step (2) according to the design required size to obtain a magnet finished product, and cleaning.
Further, the moisture content of the permanent magnetic ferrite slurry is 22-30% by weight.
Further, the average particle size of the permanent magnetic ferrite particles contained in the permanent magnetic ferrite slurry is 0.6-0.7 μm.
By utilizing the method, the batch production of the permanent magnetic ferrite magnet with residual magnetism Br more than or equal to 4150 Gs and intrinsic coercive force Hcj more than or equal to 4000 Oe can be realized under the condition of not adding rare earth elements and/or cobalt elements; under the condition of adding rare earth elements and/or cobalt elements, the molding and pressing efficiency of the permanent magnetic ferrite magnet green body, the quality of the magnet finished product and the quality qualification rate can be greatly improved.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment 1/2 of a permanent magnetic ferrite magnet molding boosting injection device of the invention;
FIG. 2 is a schematic view of the embodiment 1/2 of FIG. 1 in a suck mode;
FIG. 3 is a schematic illustration of the embodiment 1/2 of FIG. 1 in a charge state;
fig. 4 is a schematic structural diagram of a permanent ferrite magnet molding and injecting device in the prior art.
In the figure: 1. the device comprises a slurry stirring barrel, a discharge port at the bottom of the slurry stirring barrel, a cleaning port of the slurry stirring barrel, a horizontal boosting plunger pump, a boosting plunger, a horizontal boosting plunger pump propelling cylinder oil inlet pipe, a horizontal boosting plunger pump returning cylinder oil inlet pipe, a horizontal boosting plunger pump slurry cavity, a horizontal boosting plunger pump feed inlet, a horizontal boosting plunger pump feed outlet, a horizontal boosting plunger pump discharge pipe, a gate valve, a 4-material injection pump, a 4 a-material injection pump piston, a 4 b-material injection pump propelling cylinder oil inlet pipe, a 4 c-material injection pump returning cylinder oil inlet pipe, a 4 d-material injection pump slurry cavity and a 4 e-material injection pump feed pipe.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Example 1
Referring to the attached drawings 1-3, the device comprises a slurry stirring barrel 1, a horizontal boosting plunger pump 2 and a material injection pump 4, wherein the horizontal boosting plunger pump 2 and the material injection pump 4 are installed below the slurry stirring barrel 1, and the material injection pump 4 is connected with a discharge pipe 2f of the horizontal boosting plunger pump through a gate valve 3.
The bottom of the slurry stirring barrel 1 is provided with a discharge port 1a, and the side surface of the bottom is provided with a slurry stirring barrel cleaning port 1b.
The horizontal boosting plunger pump 2 comprises a horizontal boosting plunger pump slurry cavity 2d and a boosting plunger 2a arranged in the horizontal boosting plunger pump slurry cavity 2d, the diameter of the boosting plunger 2a is phi 160mm, the inner diameter of the horizontal boosting plunger pump slurry cavity 2d is phi 161.5mm, a horizontal boosting plunger pump feed inlet 2e is arranged at the upper side of the horizontal boosting plunger pump slurry cavity 2d, the horizontal boosting plunger pump propelling cylinder oil inlet pipe 2b and the horizontal boosting plunger pump returning cylinder oil inlet pipe 2c are arranged in the horizontal boosting plunger pump slurry cavity 2d, most of slurry in the horizontal boosting plunger pump slurry cavity 2d enters the gate valve 3 through the horizontal boosting plunger pump discharging pipe 2f in the propelling process of the horizontal boosting plunger pump boosting plunger 2a and then enters the slurry injection pump slurry cavity 4d, and a small amount of slurry returns to the slurry stirring barrel 1 through a gap between the horizontal boosting plunger pump boosting plunger 2a and the horizontal boosting plunger pump slurry cavity 2d.
The material injection pump 4 comprises a material injection pump slurry cavity 4d and a material injection pump piston 4a arranged in the material injection pump slurry cavity 4d, and the side surface of the material injection pump slurry cavity 4d is provided with a material injection pump propelling cylinder oil inlet pipe 4b, a material injection pump returning cylinder oil inlet pipe 4c and a material injection pump feeding pipe 4e.
The horizontal boosting plunger pump 2 and the injection pump 4 are both controlled by hydraulic pressure, wherein a flange plate or a rubber tube is directly connected between a discharge port 1a at the bottom of the slurry stirring barrel 1 and a feed port 2e above the horizontal boosting plunger pump 2, slurry can freely fall into the feed port 2e of the horizontal boosting plunger pump due to self gravity, the outer diameter of the discharge port 1a at the bottom of the slurry stirring barrel 1 is 100mm, the inner diameter of the feed port 2e of the horizontal boosting plunger pump is 101mm, and a feed pipe 4e of the injection pump is connected with a magnet forming die (not shown in the figure). The forming die is an arched tile-shaped magnet die (one die 12), and is arranged on a magnetic field forming hydraulic machine special for magnetic materials.
The working process of the permanent ferrite magnet molding boosting and injecting device comprises a material sucking process of an injection pump and a material injecting process of the injection pump:
referring to fig. 2, the material injection pump sucks the material process:
the hydraulic control gate valve 3 is opened, meanwhile, high-pressure hydraulic oil enters an oil inlet pipe 2b of a propelling cylinder of the horizontal boosting plunger pump, and a boosting plunger 2a pushes right to pressurize slurry in a slurry cavity 2d of the horizontal boosting plunger pump; meanwhile, high-pressure hydraulic oil enters the material injection pump and returns to the oil inlet pipe 4c of the cylinder, the piston 4a of the material injection pump moves upwards, and vacuum is formed in the material slurry cavity 4d of the material injection pump; slurry in the pressurized horizontal boosting plunger pump slurry cavity 2d is pumped out of the material pipe 2f and the gate valve 3 through the horizontal boosting plunger pump, and then the slurry cavity 4d of the injection pump is filled with the slurry. Because the pressure intensity of high-pressure hydraulic oil in the propelling cylinder of the horizontal boosting plunger pump 2 can be up to more than 2MPa, slurry in the slurry cavity 2d of the horizontal boosting plunger pump can smoothly fill the vacuum range in the slurry cavity 4d of the injection pump after passing through the material outlet pipe 2f and the gate valve 3 of the horizontal boosting plunger pump, and air or residual vacuum cannot enter the slurry cavity 4d of the injection pump; the redundant slurry in the slurry cavity 2d of the horizontal boosting plunger pump returns to the slurry stirring barrel 1 through the gap between the boosting plunger 2a of the horizontal boosting plunger pump and the slurry cavity 2d of the horizontal boosting plunger pump.
Referring to fig. 3, the material injection process of the material injection pump:
the hydraulic control gate valve 3 is closed, high-pressure hydraulic oil enters the oil inlet pipe 4b of the pushing cylinder of the injection pump, the piston 4a of the injection pump is pressed downwards, slurry in the slurry cavity 4d of the injection pump is conveyed out of the material conveying pipe 4e of the injection pump by high pressure and enters each die cavity of the tile-shaped magnet die, and the pushing cylinder of the injection pump can transfer the pressure of more than 2MPa, so that the slurry can be smoothly filled in each die cavity of the die. After the material injection is finished, the press starts to orient the slurry forming magnetic field in the die cavity and press and dewater for forming.
Before pressing is finished, high-pressure hydraulic oil enters a horizontal boosting plunger pump returning cylinder oil inlet pipe 2c, a boosting plunger 2a moves leftwards and returns, a vacuum cavity is formed in a horizontal boosting plunger pump slurry cavity 2d, and due to the fact that the aperture of a flange plate between a bottom discharge port 1a of a slurry stirring barrel and a horizontal boosting plunger pump feed port 2e is large, and resistance increasing factors such as a valve and the like do not exist between the horizontal boosting plunger pump 2 and the bottom discharge port 1a of the slurry stirring barrel, slurry in the slurry stirring barrel 1 can smoothly fall under the action of the self weight to fill the vacuum cavity, and preparation is made for a material injection pump material suction process in the next molding cycle.
The slurry stirring barrel cleaning port 1b functions as follows: when the slurry in the slurry stirring barrel needs to be replaced, the slurry in the barrel and the water for cleaning the stirring barrel can be discharged from the opening.
The permanent magnetic ferrite pre-sintering powder without rare earth elements and cobalt elements is prepared by adopting a known technology, the powder is divided into three parts to be used as raw materials for preparing the permanent magnetic ferrite magnet, the three parts of raw materials are respectively added with a known formula such as a dispersing agent, a formula material and the like, then the mixture is respectively wet-ground into slurry with the average particle size of 0.61 mu m, 0.65 mu m and 0.69 mu m, and the slurry is dehydrated and regulated into permanent magnetic ferrite slurry with the water content of 28 percent for standby.
Starting a permanent magnetic ferrite magnet forming, boosting and injecting device and a magnetic field forming hydraulic press, respectively adding the three slurries into a slurry stirring barrel, injecting the slurries into a die cavity by using the forming, boosting and injecting device, pressing the slurries into tile-shaped magnet green bodies by using the magnetic field forming hydraulic press, and randomly inspecting the weight of each die cavity green body; specific results are shown in table 1 below:
TABLE 1 green body weight for each cavity
As can be seen from table 1, the green body formed from the three slurries of this example had a cavity weight variation of less than 3%. When the weight deviation of the green body of each cavity in the multi-cavity die is 3%, the pressure born by each cavity in the pressing process is close to that born by the pressing machine, and the consistency of the green body of each cavity is favorably realized.
Sintering the green body produced by the slurry in an electric kiln at 1180 ℃ to form a blank; grinding and cleaning the blank to obtain a tile-shaped magnet finished product; then the appearance quality of the finished product of the tile-shaped magnet is fully checked, the quality qualification rate is counted, the magnetic performance of the tile-shaped magnet is randomly checked, and the specific result is shown in the following table 2:
TABLE 2 quality and magnetic properties of the product produced from the three slurries
As can be seen from Table 2, the quality yield of the three slurries used in this embodiment is above 91%, and the magnetic properties meet the standard requirements of "residual magnetism Br ≥ 4150 Gs, intrinsic coercive force Hcj ≥ 4000 Oe".
Example 2
In the embodiment, the same permanent magnetic ferrite magnet forming boosting and injecting device, tile-shaped magnet one-mold multi-cavity mold and magnetic material special magnetic field forming hydraulic press as those in embodiment 1 are adopted.
The permanent magnetic ferrite pre-sintering material powder without rare earth elements and cobalt elements is prepared by a known technology, a dispersant, a formula material and other known formulas are added into raw materials, wet grinding is carried out to obtain slurry with the average particle size of 0.66 mu m, and the slurry is dehydrated and respectively regulated to obtain permanent magnetic ferrite slurry for standby with the water content of 23%, 26% and 29%.
Starting a permanent magnetic ferrite magnet forming, boosting and injecting device and a magnetic field forming hydraulic press, respectively adding the three slurries into a slurry stirring barrel, injecting the slurries into a die cavity by using the forming, boosting and injecting device, pressing the slurries into tile-shaped magnet green bodies by using the magnetic field forming hydraulic press, and randomly inspecting the weight of each die cavity green body; specific results are shown in table 3 below:
TABLE 3 green body weight for each cavity
As can be seen from table 3, the green body formed from the three slurries of this example had a cavity weight variation of less than 3%. When the weight deviation of the green body of each cavity in the multi-cavity die is 3%, the pressure born by each cavity in the pressing process is close to that born by the pressing machine, and the consistency of the green body of each cavity is favorably realized.
Sintering the green body produced by the slurry in an electric kiln at 1180 ℃ to form a blank; grinding and cleaning the blank to obtain a finished product of the tile-shaped magnet for the 770-type motor; then the appearance quality of the finished product of the tile-shaped magnet is fully checked, the quality qualification rate is counted, the magnetic performance of the tile-shaped magnet is randomly checked, and the specific result is shown in the following table 4:
TABLE 4 quality and magnetic properties of the product produced with the three slurries
As can be seen from Table 4, the quality yield of the three slurries used in this embodiment is above 91%, and the magnetic properties meet the standard requirements of "residual magnetism Br ≥ 4150 Gs, intrinsic coercive force Hcj ≥ 4000 Oe".
Various modifications and variations of the present invention may be made by those skilled in the art, and they are still within the scope of the present patent invention provided they are within the scope of the claims and their equivalents.
What is not described in detail in the specification is prior art that is well known to those skilled in the art.
Claims (10)
1. The utility model provides a permanent magnetic ferrite magnet shaping boosting annotates material device, includes ground paste agitator, horizontal boosting plunger pump and notes material pump, its characterized in that: the horizontal boosting plunger pump is arranged under the slurry stirring barrel, a valve is not arranged between a discharge port at the bottom of the slurry stirring barrel and a feed port above the horizontal boosting plunger pump and is in through connection, the diameter of a through hole between the discharge port and the feed port is more than or equal to phi 80mm, and slurry enters the feed port of the horizontal boosting plunger pump under the action of self gravity; the material injection pump is connected with a material discharge pipe of the horizontal boosting plunger pump through a gate valve, and a material feeding pipe of the material injection pump is connected with the magnet forming die; the horizontal boosting plunger pump is provided with a horizontal boosting plunger pump slurry cavity and a horizontal boosting plunger arranged in the horizontal boosting plunger pump slurry cavity, and slurry in the horizontal boosting plunger pump slurry cavity can return to the slurry stirring barrel through a gap between the horizontal boosting plunger pump boosting plunger and the horizontal boosting plunger pump slurry cavity.
2. The permanent magnetic ferrite magnet molding boosting injection device according to claim 1, characterized in that: the horizontal boosting plunger pump is provided with a horizontal boosting plunger pump propelling cylinder oil inlet pipe and a horizontal boosting plunger pump returning cylinder oil inlet pipe, and a feed inlet is formed in the upper side of a horizontal boosting plunger pump slurry cavity.
3. The permanent magnetic ferrite magnet molding boosting injection device according to claim 1 or 2, characterized in that: the material injection pump is provided with a slurry cavity, a piston is arranged in the slurry cavity of the material injection pump, and an oil inlet pipe of a propelling cylinder of the material injection pump and an oil inlet pipe of a returning cylinder of the material injection pump are arranged on the outer side of the material injection pump.
4. The permanent magnetic ferrite magnet molding boosting injection device according to claim 1 or 2, characterized in that: and a discharge port at the bottom of the slurry stirring barrel is directly connected with a feed port of the horizontal boosting plunger pump through a flange.
5. The permanent magnetic ferrite magnet molding boosting injection device according to claim 1 or 2, characterized in that: and a discharge hole at the bottom of the slurry stirring barrel is directly connected with a feed inlet of the horizontal boosting plunger pump through a rubber tube.
6. The permanent magnetic ferrite magnet molding boosting injection device according to claim 1 or 2, characterized in that: the horizontal boosting plunger pump is a hydraulic control pump.
7. The permanent magnetic ferrite magnet molding boosting injection device according to claim 1 or 2, characterized in that: the material injection pump is a hydraulic control pump.
8. A method for manufacturing a magnet by using the permanent magnetic ferrite magnet molding injection-assisting device according to any one of claims 1 to 7, characterized in that: the method comprises the following steps:
(1) molding: adopting permanent magnetic ferrite slurry as a raw material, actively pushing the slurry into a slurry cavity of an injection pump by using a horizontal boosting plunger pump arranged below a slurry stirring barrel, and injecting the slurry in the slurry cavity into a forming die through an injection pipe by using the injection pump for forming to obtain a formed green body;
(2) and (3) sintering: placing the molded green body obtained in the step (1) into a sintering kiln for sintering to obtain a magnet blank;
(3) grinding and cleaning: and (3) grinding the magnet blank obtained in the step (2) according to the design required size to obtain a magnet finished product, and cleaning.
9. The magnet manufacturing method according to claim 8, characterized in that: the weight content of water in the permanent magnetic ferrite slurry is 22-30%.
10. The magnet manufacturing method according to claim 8 or 9, characterized in that: the average particle size of the permanent magnetic ferrite particles contained in the permanent magnetic ferrite slurry is 0.6-0.7 mu m.
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| CN202010039854.6A CN110842205B (en) | 2020-01-15 | 2020-01-15 | Permanent magnetic ferrite magnet molding boosting injection device and magnet manufacturing method |
| PCT/CN2020/119224 WO2021143210A1 (en) | 2020-01-15 | 2020-09-30 | Permanent ferrite magnet forming boost injection apparatus and magnet manufacturing method |
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| CN116423646A (en) * | 2023-06-02 | 2023-07-14 | 济南鸿广建筑设备安装有限公司 | GRC light partition board processing and forming process capable of uniformly distributing slurry |
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| CN110842205A (en) | 2020-02-28 |
| WO2021143210A1 (en) | 2021-07-22 |
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