Forming device and forming method of tile-shaped radiation magnetic steel for permanent magnet servo motor

Abstract

The present invention discloses a forming device and a forming method of a tile-shaped radiation magnetic steel for a permanent magnet servo motor. A magnetic conductive block, a left magnetic conductive side plate and a right magnetic conductive side plate are arranged in the forming device, a magnetic field radiation distribution area is formed between the magnetic conductive block and the left magnetic conductive side plate and between the magnetic conductive block and the right magnetic conductive side plate respectively, and two mold cavities are arranged to form two symmetrically distributed magnetic field radiation distribution areas between the magnetic conductive block, the left magnetic conductive side plate and the right magnetic conductive side plate. The advantages are that the orientation field distribution of the tile-shaped radiation magnetic steel can be uniform, the consistency of the radial orientation radiation angle distribution of the tile-shaped radiation magnetic steel can be improved, the production efficiency is high, and the risk of forming fracture is low.

Description

Technical Field

[0001] The invention relates to a device and method for forming a tile-shaped radiation magnetic steel, and in particular to a device and method for forming a tile-shaped radiation magnetic steel for a permanent magnet servo motor. Background Art

[0002] With the development of motor technology, permanent magnet servo motors, as a high-performance motor, are increasingly used in a wide range of fields. At the same time, the requirements for permanent magnet servo motors are also increasing. The traditional permanent magnet servo motors using parallel radial oriented magnetic steels are gradually being replaced by permanent magnet servo motors using radiating magnetic steels due to their disadvantages such as large vibration and noise.

[0003] For the production of radiation magnetic steel, most of them adopt isotropic bonded magnet splicing or multi-pole magnetization. However, in order to improve the consistency of radiation orientation, the former needs to increase the polarization of bonded magnets, thereby increasing the use of splicing adhesives, resulting in a decrease in the magnetic energy product of the radiation magnetic steel. If the polarization is reduced, the width-to-thickness ratio of the spliced ​​bonded magnets will be increased, the structural strength of the spliced ​​bonded magnets will be reduced, and the qualified rate of the bonded magnets will be reduced. The latter has a complex production process, expensive production equipment and needs to be designed separately for different products, which is not conducive to actual production.

[0004] In recent years, some manufacturers have solved the above problems by designing the structure of the mold device to realize the preparation of radiation magnetic steel on a conventional parallel magnetization orientation press. For example, the Chinese patent with the publication number CN 110783051A discloses a radiation-oriented sintered NdFeB tile and a preparation method and a molding device, which forms a radiation magnetic field by arranging magnetic conductive plates on both sides of the mold cavity and arranging two symmetrically distributed uniform magnetic conductive plates between the two magnetic conductive plates, and solves the problems of uneven orientation of the upper and lower magnetic fields and molding fractures by the method of double powder loading and double molding. Although the molding device stretches the magnetic field toward the two additional uniform magnetic conductive plates, thereby alleviating the concentration of the magnetic field in the middle, the magnetic field changed in this way produces an obvious angular deviation through the magnetic field emitted from the sides of the two uniform magnetic conductive plates and the magnetic field pulled between the two uniform magnetic conductive plates, resulting in the problem of uneven radial orientation magnetic deflection of the radiant magnetic steel. In addition, its one-mold-one-cavity structure has low production efficiency when producing tile-shaped radiant magnetic steel. The method of double powder loading and double molding published by the device solves the problems of uneven upper and lower orientation of the magnetic field and molding fracture, but also adds a stage of combining upper and lower different densities of double powder loading and double molding, which inevitably increases the risk of cracking of the parting surface.

[0005] The technical solution disclosed in the above patent does not fully improve the problem of radial orientation radiation angle distribution consistency and forming fracture of tile-shaped radiation magnets, and there is a problem of low production efficiency in the production of tile-shaped radiation magnets. Summary of the invention

[0006] One of the technical problems to be solved by the present invention is to provide a forming device for tile-shaped radiation magnetic steel for permanent magnet servo motors that can make the orientation field distribution of tile-shaped radiation magnetic steel uniform, improve the consistency of the radial orientation radiation angle distribution of the tile-shaped radiation magnetic steel, and has high production efficiency and low risk of forming fracture.

[0007] The technical solution adopted by the present invention to solve one of the above technical problems is a forming device of a tile-shaped radiant magnetic steel for a permanent magnet servo motor, including a female mold and a forming press, the female mold is made of non-magnetic conductive material, the female mold itself is left-right symmetrical about a certain plane, and the plane is called a first symmetry plane, the female mold itself is front-back symmetrical about a certain plane, and the plane is called a second symmetry plane, the female mold is provided with a magnetic conductive cavity and two mold cavities, the magnetic conductive cavity and the two mold cavities both pass through the female mold up and down, the shapes of the two mold cavities match the shape of the tile-shaped radiant magnetic steel, the magnetic conductive cavity itself is both left-right symmetrical about the first symmetry plane and front-back symmetrical about the second symmetry plane, and the two mold cavities are respectively located at the The left and right sides of the magnetic cavity, and the two mold cavities are symmetrical about the first symmetry plane, each mold cavity itself is symmetrical front-to-back about the second symmetry plane, the magnetic cavity is provided with a magnetic block which completely fills it, the left side of the female mold is provided with a left magnetic side plate, and the right side of the female mold is provided with a right magnetic side plate, the left magnetic side plate and the right magnetic side plate are symmetrical about the first symmetry plane, the left magnetic side plate itself is symmetrical front-to-back about the second symmetry plane, and the right magnetic side plate itself is symmetrical front-to-back about the second symmetry plane; the molding press has two upper pressing heads and two lower pressing heads, the two lower pressing heads are matched with the two mold cavities one-to-one, and the two upper pressing heads are matched with the two mold cavities one-to-one.

[0008] Compared with the prior art, the molding device of the present invention has the advantage that by setting a magnetic conductive block, a left magnetic conductive side plate and a right magnetic conductive side plate, and respectively setting a mold cavity between the magnetic conductive block and the left magnetic conductive side plate and between the magnetic conductive block and the right magnetic conductive side plate, when the tile-shaped radiation magnetic steel is subjected to the pressing molding process, the two lower pressing heads of the molding press enter the two mold cavities one by one from the bottom of the two mold cavities, and then fill the two mold cavities with neodymium iron boron powder for preparing the tile-shaped radiation magnetic steel with the same preset weight, and then the two upper pressing heads of the molding press enter from the bottom of the two mold cavities. The upper part of the two mold cavities corresponds to each other and enters the two mold cavities for pressing. During the pressing process, when the magnetizing coil is used for orientation, the magnetic lines of force generated by the magnetizing coil pass through the left magnetic side plate, the part of the female mold located on the left side of the magnetic block, the magnetic block, the part of the female mold located on the right side of the magnetic block and the right magnetic side plate in sequence. Between the left magnetic side plate and the magnetic block, due to the refraction of the magnetic lines of force on the right side of the left magnetic side plate and the left side of the magnetic block, a magnetic field radiation distribution area is formed. Between the right magnetic side plate and the magnetic block, due to the right magnetic side plate, the magnetic line of force is refracted. The refraction of the magnetic force lines on the left side of the magnetic side plate and the right side of the magnetic block will also form a magnetic field radiation distribution area, thereby forming two magnetic field radiation distribution areas symmetrically distributed on the left and right, and the two mold cavities are located in the two magnetic field radiation distribution areas one by one. Therefore, through the two mold cavities set in the two magnetic field radiation distribution areas, it is possible to achieve single-mold single-time production of two-stage molded green billets, greatly improving production efficiency, and through the refraction of the magnetic force lines on the right side of the left magnetic side plate, the left and right sides of the right magnetic side plate, and the left side of the magnetic block, the direction of the magnetic force lines can be changed to a radiation angle that meets the orientation requirements, so that the orientation magnetic field distribution of the tile-shaped radiation magnetic steel formed in the two mold cavities is uniform, and the tile-shaped radiation magnetic steel finally produced has high consistency in magnetic declination in the radial direction. At the same time, because the powder is filled once and then pressed during the molding process, the risk of molding fracture is relatively small. Therefore, the present invention can make the orientation field distribution of the tile-shaped radiation magnetic steel uniform, improve the consistency of the radial orientation radiation angle distribution of the tile-shaped radiation magnetic steel, and has high production efficiency and low risk of molding fracture.

[0009] Furthermore, the outer side wall of the female mold is surrounded by six side surfaces distributed in six directions: up, down, front, back, left and right. The upper, lower, front and back four side surfaces of the female mold are all planes, and the left and right side surfaces are both arc cylinders. The left side surface and the right side surface of the female mold are left-right symmetrical with respect to the first symmetry plane, and the front side surface and the rear side surface of the female mold are front-to-back symmetrical with respect to the second symmetry plane. The left side surface of the female mold itself is front-to-back symmetrical with respect to the second symmetry plane, and the right side surface of the female mold itself is front-to-back symmetrical with respect to the second symmetry plane. The front side surface of the female mold itself is left-right symmetrical with respect to the first symmetry plane, and the rear side surface of the female mold itself is left-to-back symmetrical with respect to the first symmetry plane. right symmetry; the outer wall of the magnetic conductive cavity is surrounded by 6 side surfaces distributed in six directions: upper, lower, front, rear, left and right; the upper and lower side surfaces of the magnetic conductive cavity are both planes, the left and right side surfaces are both arc cylinders convex outward, the front and rear side surfaces are both arc cylinders convex inward or both are arc cylinders convex outward, the left side surface and the right side surface of the magnetic conductive cavity are left-right symmetric about the first symmetry plane, the front side surface and the rear side surface of the magnetic conductive cavity are front-to-back symmetric about the second symmetry plane, the left side surface of the magnetic conductive cavity itself is front-to-back symmetric about the second symmetry plane, the right side surface of the magnetic conductive cavity itself is front-to-back symmetric about the second symmetry plane, the front side of the magnetic conductive cavity The surface itself is symmetrical about the first symmetrical plane, and the rear side surface of the magnetic conductive cavity itself is symmetrical about the first symmetrical plane; the left side surface of the magnetic conductive cavity is coaxial with the left side surface of the female mold, and the right side surface of the magnetic conductive cavity is coaxial with the right side surface of the female mold; the left magnetic conductive side plate is formed by opening a circular arc cylinder concave to the left on the right side surface of a rectangular block, the circular arc cylinder of the left magnetic conductive side plate is completely fitted with the left side surface of the female mold, the upper side surface of the left magnetic conductive side plate and the upper side surface of the female mold are located in the same plane, the lower side surface of the left magnetic conductive side plate and the lower side surface of the female mold are located in the same plane, and the right magnetic conductive side plate is formed by opening a circular arc cylinder concave to the left on the left side surface of a rectangular block. The arc cylinder with a concave side is formed, the arc cylinder of the right magnetic conductive side plate is completely fitted with the right side surface of the female mold, the upper side surface of the right magnetic conductive side plate and the upper side surface of the female mold are located in the same plane, and the lower side surface of the right magnetic conductive side plate and the lower side surface of the female mold are located in the same plane; the left magnetic conductive side plate itself is front-to-back symmetrical about the second symmetry plane, and the right magnetic conductive side plate itself is front-to-back symmetrical about the second symmetry plane; a first rectangular cavity is formed between the front part of the right side surface of the left magnetic conductive side plate, the front side surface of the female mold and the front part of the left side surface of the right magnetic conductive side plate, and a front stopper is arranged in the first rectangular cavity, and the front stopper just fills the first rectangular cavity completely;The left magnetic conductive side plate and the right magnetic conductive side plate are respectively fixedly connected to the front stopper, and a second rectangular cavity is formed between the rear side of the right side surface of the left magnetic conductive side plate, the rear side surface of the female mold and the rear side of the left side surface of the right magnetic conductive side plate. A rear stopper is arranged in the second rectangular cavity, and the rear stopper just completely fills the second rectangular cavity; the front stopper and the rear stopper are both made of non-magnetic conductive materials, and the left magnetic conductive side plate and the right magnetic conductive side plate are respectively fixedly connected to the rear stopper. ;

[0010] Furthermore, the left magnetic conductive side plate and the right magnetic conductive side plate are respectively fixedly connected to the front block by bolts, and the left magnetic conductive side plate and the right magnetic conductive side plate are respectively fixedly connected to the rear block by bolts.

[0011] Furthermore, each of the mold cavities is tile-shaped, the mold cavity on the left is called the left mold cavity, and the mold cavity on the right is called the right mold cavity. The left mold cavity is surrounded by six side surfaces distributed in six directions: upper, lower, front, rear, left and right. The upper side surface and the lower side surface of the left mold cavity are both planes, the upper side surface of the left mold cavity is flush with the upper side surface of the female mold, the lower side surface of the left mold cavity is flush with the lower side surface of the female mold, the left side surface and the right side surface of the left mold cavity are both arc cylinders convex to the left, the left side surface and the right side surface of the left mold cavity are coaxial, the front side surface and the rear side surface of the left mold cavity are both planes, and the front side surface and the rear side surface of the left mold cavity can intersect after extending to the right; the maximum distance between the front side surface and the rear side surface of the left mold cavity is less than or equal to 0.5 times the distance between the front side surface and the rear side surface of the female mold; the radius of the right side surface of the left mold cavity is greater than the radius of the left side surface of the female mold.

[0012] Furthermore, each lower pressure head is provided with a pulse vibration device for making it vibrate. When the two lower pressure heads enter the two mold cavities one by one from the bottom of the two mold cavities, the gap between each lower pressure head and the mold cavity in which it is located is 0.04mm~0.3mm; when the two upper pressure heads enter the two mold cavities one by one from the top of the two mold cavities, the gap between each upper pressure head and the mold cavity in which it is located is 0.04mm~0.3mm.

[0013] Furthermore, the left magnetic conductive side plate and the right magnetic conductive side plate are made of the same magnetic conductive material, and the magnetic permeability of the magnetic conductive material used in the magnetic conductive block is higher than the magnetic permeability of the magnetic conductive material used in the left magnetic conductive side plate and the right magnetic conductive side plate.

[0014] The second technical problem to be solved by the present invention is to provide a forming method of a forming device for a tile-shaped radiation magnetic steel for a permanent magnet servo motor, which can make the orientation field distribution of the tile-shaped radiation magnetic steel uniform, improve the consistency of the radial orientation radiation angle distribution of the tile-shaped radiation magnetic steel, and has high production efficiency and low risk of forming fracture.

[0015] The technical solution adopted by the present invention to solve the second technical problem is: a forming method of a forming device for a tile-shaped radiation magnetic steel for a permanent magnet servo motor, comprising the following steps: Step 1, control the two pressing heads to enter the preset positions in the two mold cavities from the bottom of the two mold cavities one by one; Step 2: vibrate the two lower pressure heads; Step 3: Fill the preset weight of NdFeB powder for preparing tile-shaped radiation magnets into two mold cavities. The weight of NdFeB powder in the two mold cavities is equal, and the average particle size of NdFeB powder is 3~5μm. The loose density of NdFeB powder in each mold cavity is 2.1~2.4g / cm 3 ; Step 4: Control the two upper pressing heads to enter the preset pre-pressing positions in the two cavities from above the two cavities one by one and then stop to complete the pre-pressing. At this time, the density formed in each cavity is 2.3~3.0g / cm 3 Pre-pressed green body; Step 5, turn on the magnetizing coil to magnetize and orient the pre-pressed green body. At this time, the right side surface of the left magnetic conductive side plate and the left side surface of the magnetic conductive block refract the magnetic force lines to form a magnetic field radiation distribution area, and the left side surface of the right magnetic conductive side plate and the right side surface of the magnetic conductive block refract the magnetic force lines to form a magnetic field radiation distribution area, thereby forming two magnetic field radiation distribution areas symmetrically distributed on the left and right. Since the two mold cavities are located in the two magnetic field radiation distribution areas in a one-to-one correspondence, the magnetization orientation of the pre-pressed green body inside the two mold cavities is achieved; Step 6: After the magnetization orientation is completed, the magnetization coil is turned off and the vibration of the two lower pressure heads is stopped; Step 7: Continue to control the two upper pressing heads to move downward to the preset pressing position and stop, and then complete the demagnetization. At this time, the density formed in each mold cavity is 3.9~4.2g / cm 3 The green body of the molding; Step 8: Control the two upper pressing heads and the two lower pressing heads to reset and demold the molded green body in each mold cavity.

[0016] Compared with the prior art, the molding method of the present invention has the advantage that a magnetic conductive block, a left magnetic conductive side plate and a right magnetic conductive side plate are arranged in the molding device, and a magnetic field radiation distribution area is formed between the magnetic conductive block and the left magnetic conductive side plate and between the magnetic conductive block and the right magnetic conductive side plate respectively, so that the two mold cavities are located in the two symmetrically distributed magnetic field radiation distribution areas formed between the magnetic conductive block, the left magnetic conductive side plate and the right magnetic conductive side plate, thereby realizing a single-mold single-time production of two-stage molding green billets, greatly improving the production efficiency, and in the process of filling the NdFeB powder into the two mold cavities, the fluidity of the NdFeB powder is improved by vibrating the two lower pressure heads, thereby making the density distribution of the NdFeB powder in the mold cavity more uniform during the pressing process, and forming a density of 2.3~3.0g / cm by pre-pressing. 3 After pre-pressing the green body, it is magnetized and oriented by the radiation magnetic field in two symmetrically distributed magnetic field radiation distribution areas, so as to further improve the consistency of the green body orientation, thereby solving the problems of large green body deformation and green body cracking, and avoiding the problem of parting surface cracking caused by multiple powder feeding and pressing in the prior art. Therefore, the molding method of the present invention can make the orientation field distribution of the tile-shaped radiation magnetic steel uniform, improve the consistency of the radial orientation radiation angle distribution of the tile-shaped radiation magnetic steel, and has high production efficiency and low risk of molding fracture.

[0017] Furthermore, in the step 2, the two pressing heads are vibrated by a pulse vibration device, and the vibration frequency of the two pressing heads reaches 20 Hz to 200 Hz. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A three-dimensional diagram of a forming device for a tile-shaped radiation magnetic steel for a permanent magnet servo motor of the present invention; Figure 2 It is a cross-sectional top view of a forming device for a tile-shaped radiation magnetic steel for a permanent magnet servo motor of the present invention; Figure 3 It is a schematic diagram of an exploded view of a forming device for a tile-shaped radiation magnetic steel for a permanent magnet servo motor of the present invention. DETAILED DESCRIPTION

[0019] The present invention discloses a device for forming a tile-shaped radiation magnetic steel for a permanent magnet servo motor. The device for forming a tile-shaped radiation magnetic steel for a permanent magnet servo motor of the present invention is further described in detail below in conjunction with the embodiments of the accompanying drawings.

[0020] Embodiment 1: Figures 1 to 3As shown, a forming device for a tile-shaped radiation magnetic steel for a permanent magnet servo motor comprises a female mold 1 and a forming press. The female mold 1 is made of non-magnetic conductive material. The female mold 1 is symmetrical about a certain plane, and the plane is called a first symmetry plane L1. The female mold 1 is symmetrical about a certain plane, and the plane is called a second symmetry plane L2. A magnetic conductive cavity 2 and two mold cavities are provided on the female mold 1. The magnetic conductive cavity 2 and the two mold cavities both penetrate the female mold 1 from top to bottom. The shapes of the two mold cavities match the shape of the tile-shaped radiation magnetic steel. The magnetic conductive cavity 2 is symmetrical about the first symmetry plane L1 and symmetrical about the second symmetry plane L2. The two mold cavities are respectively located on the left and right sides of the magnetic conductive cavity 2. On the right side, the two mold cavities are symmetrical about the first symmetry plane L1, and each mold cavity itself is symmetrical front to back about the second symmetry plane L2. A magnetic block 3 is arranged in the magnetic cavity 2 to completely fill it. A left magnetic side plate 4 is arranged on the left side of the female mold 1, and a right magnetic side plate 5 is arranged on the right side of the female mold 1. The left magnetic side plate 4 and the right magnetic side plate 5 are symmetrical about the first symmetry plane L1, the left magnetic side plate 4 itself is symmetrical front to back about the second symmetry plane L2, and the right magnetic side plate 5 itself is symmetrical front to back about the second symmetry plane L2; the molding press has two upper pressing heads and two lower pressing heads, the two lower pressing heads are matched with the two mold cavities one by one, and the two upper pressing heads are matched with the two mold cavities one by one.

[0021] In this embodiment, when the tile-shaped radiation magnetic steel is subjected to a press forming process, the two lower pressure heads of the forming press enter the two mold cavities one by one from the bottom of the two mold cavities, and then the two film cavities are respectively filled with neodymium iron boron powder for preparing the tile-shaped radiation magnetic steel with a preset weight. Then, the two upper pressure heads of the forming press enter the two mold cavities one by one from the top of the two mold cavities for pressing. During the pressing and forming process, when the magnetizing coil is used for orientation, the magnetic lines of force generated by the magnetizing coil pass through the left magnetic side plate 4, the part of the female mold 1 located on the left side of the magnetic block 3, the magnetic block 3, the part of the female mold 1 located on the right side of the magnetic block 3 and the right magnetic side plate 5 in sequence. Between the left magnetic side plate 4 and the magnetic block 3, due to the refraction of the magnetic lines of force on the right side surface of the left magnetic side plate 4 and the left side surface of the magnetic block 3, a magnetic field radiation distribution area is formed. Between the right magnetic side plate 5 and the magnetic block 3, due to the right The refraction of the magnetic force lines on the left side surface of the magnetic side plate 5 and the right side surface of the magnetic block 3 will also form a magnetic field radiation distribution area, thereby forming two magnetic field radiation distribution areas that are symmetrically distributed on the left and right, and the two mold cavities are located one by one in the two magnetic field radiation distribution areas. Therefore, through the two mold cavities set in the two magnetic field radiation distribution areas, it is possible to achieve single-mold single-time production of two-stage molded green billets, greatly improving production efficiency, and through the refraction of the magnetic force lines on the right side surface of the left magnetic side plate 4, the left and right sides of the right magnetic side plate 5, and the left side surface of the magnetic block 3, the direction of the magnetic force lines can be changed to a radiation angle that meets the orientation requirements, so that the orientation magnetic field distribution of the tile-shaped radiation magnetic steel formed in the two mold cavities is uniform, and the finally produced tile-shaped radiation magnetic steel has a high consistency in the magnetic declination angle in the radial direction. At the same time, because the powder is filled once and then pressed during the molding process, the risk of molding fracture is relatively small.

[0022] Embodiment 2: This embodiment is basically the same as Embodiment 1, except that, in this embodiment, the outer side wall of the female mold 1 is surrounded by six side surfaces distributed in six directions of up, down, front, back, left and right. The four side surfaces of the female mold 1, namely, the upper, lower, front and back, are all planes, and the left and right side surfaces are both arc cylinders. The left side surface and the right side surface of the female mold 1 are left-right symmetrical about the first symmetry plane L1, the front side surface and the rear side surface of the female mold 1 are front-to-back symmetrical about the second symmetry plane L2, the left side surface of the female mold 1 itself is front-to-back symmetrical about the second symmetry plane L2, the right side surface of the female mold 1 itself is front-to-back symmetrical about the second symmetry plane L2, the front side surface of the female mold 1 itself is left-right symmetrical about the first symmetry plane L1, and the rear side surface of the female mold 1 itself is left-right symmetrical about the first symmetry plane L1 The outer wall of the magnetic cavity 2 is surrounded by six side surfaces distributed in six directions: upper, lower, front, rear, left and right. The upper and lower side surfaces of the magnetic cavity 2 are both planes, the left and right side surfaces are both arc cylinders convex outward, the front and rear side surfaces are both arc cylinders convex outward, the left and right side surfaces of the magnetic cavity 2 are left-right symmetrical about the first symmetry plane L1, the front and rear side surfaces of the magnetic cavity 2 are front-to-back symmetrical about the second symmetry plane L2, the left side surface of the magnetic cavity 2 itself is front-to-back symmetrical about the second symmetry plane L2, the right side surface of the magnetic cavity 2 itself is front-to-back symmetrical about the second symmetry plane L2, the front side surface of the magnetic cavity 2 itself is left-right symmetrical about the first symmetry plane L1, and the rear side surface of the magnetic cavity 2 itself is left-right symmetrical about the first symmetry plane L1 ; The left side surface of the magnetic conductive cavity 2 is coaxial with the left side surface of the female mold 1, and the right side surface of the magnetic conductive cavity 2 is coaxial with the right side surface of the female mold 1; the left magnetic conductive side plate 4 is formed by opening an arc cylinder concave to the left on the right side surface of a rectangular block, the arc cylinder of the left magnetic conductive side plate 4 is completely fitted with the left side surface of the female mold 1, the upper side surface of the left magnetic conductive side plate 4 and the upper side surface of the female mold 1 are located in the same plane, and the lower side surface of the left magnetic conductive side plate 4 and the lower side surface of the female mold 1 are located in the same plane, and the right magnetic conductive side plate 5 is formed by opening an arc cylinder concave to the right on the left side surface of a rectangular block, the arc cylinder of the right magnetic conductive side plate 5 is completely fitted with the right side surface of the female mold 1, the upper side surface of the right magnetic conductive side plate 5 and the upper side surface of the female mold 1 are located in the same plane, and the lower side surface of the right magnetic conductive side plate 5 and the lower side surface of the female mold 1 The surfaces are located in the same plane; the left magnetic conductive side plate 4 itself is front-to-back symmetrical about the second symmetry plane L2, and the right magnetic conductive side plate 5 itself is front-to-back symmetrical about the second symmetry plane L2; a first rectangular cavity is formed between the front part of the right side surface of the left magnetic conductive side plate 4, the front side surface of the female mold 1 and the front part of the left side surface of the right magnetic conductive side plate 5, and a front stopper 6 is arranged in the first rectangular cavity, and the front stopper 6 just completely fills the first rectangular cavity; the left magnetic conductive side plate 4 and the right magnetic conductive side plate 5 are respectively fixedly connected to the front stopper 6, and a second rectangular cavity is formed between the rear side of the right side surface of the left magnetic conductive side plate 4, the rear side surface of the female mold 1 and the rear side of the left side surface of the right magnetic conductive side plate 5, and a rear stopper 7 is arranged in the second rectangular cavity, and the rear stopper 7 just completely fills the second rectangular cavity;The front block 6 and the rear block 7 are both made of non-magnetic conductive materials, and the left magnetic conductive side plate 4 and the right magnetic conductive side plate 5 are fixedly connected to the rear block 7 respectively. ;

[0023] In this embodiment, by adjusting the curvature of the curved cylinder of the left magnetic conductive side plate 4, the curvature of the two curved cylinders of the magnetic conductive block 3, and the curvature of the curved cylinder of the right magnetic conductive side plate 5, the direction of the magnetic lines of force can be changed, and the radiation angles that meet the requirements can be obtained in the two magnetic field radiation distribution areas. Therefore, when designing the molding device of the present invention, the curvature of the curved cylinder of the left magnetic conductive side plate 4, the curvature of the two curved cylinders of the magnetic conductive block 3, and the curvature of the curved cylinder of the right magnetic conductive side plate 5 can be set according to the radiation angle requirements, so that the designed molding device can obtain the radiation angles that meet the requirements in the two magnetic field radiation distribution areas, thereby ensuring the uniform distribution of the oriented magnetic field and the consistency of the radial magnetic declination of the produced thin-walled tile-shaped radiation magnetic steel.

[0024] Embodiment 3: This embodiment is basically the same as Embodiment 2, except that, in this embodiment, the left magnetic conductive side plate 4 and the right magnetic conductive side plate 5 are respectively fixedly connected to the front block 6 by bolts, and the left magnetic conductive side plate 4 and the right magnetic conductive side plate 5 are respectively fixedly connected to the rear block 7 by bolts.

[0025] In this embodiment, the left magnetic side plate 4 and the front block 6, the right magnetic side plate 5 and the front block 6, the left magnetic side plate 4 and the rear block 7, and the right magnetic side plate 5 and the rear block 7 are fixed by bolts respectively, and an installation cavity for accommodating the female mold 1 is formed between the left magnetic side plate 4, the front block 6, the right magnetic side plate 5 and the front block 6, and the female mold 1 can be directly embedded in the installation cavity, which is convenient for disassembly and assembly.

[0026] Embodiment 4: This embodiment is basically the same as Embodiment 2, except that, in this embodiment, each mold cavity is tile-shaped, the mold cavity on the left side is called the left mold cavity 8, and the mold cavity on the right side is called the right mold cavity 9. The left mold cavity 8 is surrounded by 6 side surfaces distributed in six directions: upper, lower, front, rear, left and right. The upper side surface and the lower side surface of the left mold cavity 8 are both planes, the upper side surface of the left mold cavity 8 is flush with the upper side surface of the female mold 1, and the lower side surface of the left mold cavity 8 is flush with the lower side surface of the female mold 1. The left side surface and the right side surface of the left mold cavity 8 are both arc cylinders convex to the left side, the left side surface and the right side surface of the left mold cavity 8 are coaxial, the front side surface and the rear side surface of the left mold cavity 8 are both planes, and the front side surface and the rear side surface of the left mold cavity 8 can intersect after extending to the right; the maximum distance between the front side surface and the rear side surface of the left mold cavity 8 is less than or equal to 0.5 times the distance between the front side surface and the rear side surface of the female mold 1; the radius of the right side surface of the left mold cavity 8 is greater than the radius of the left side surface of the female mold 1.

[0027] Embodiment 5: This embodiment is basically the same as Embodiment 2, with the difference being that, in this embodiment, each lower pressure head is provided with a pulse vibration device for vibrating it, and when the two lower pressure heads enter the two mold cavities one by one from the bottom of the two mold cavities, the gap between each lower pressure head and the mold cavity in which it is located is 0.04mm~0.3mm; when the two upper pressure heads enter the two mold cavities one by one from the top of the two mold cavities, the gap between each upper pressure head and the mold cavity in which it is located is 0.04mm~0.3mm.

[0028] In this embodiment, by vibrating each lower pressure head through a pulse vibration device, the uniformity of the NdFeB powder in each mold cavity can be improved. At the same time, the setting of the gap between the lower pressure head and the mold cavity and the setting of the gap between the upper pressure head and the mold cavity can ensure the smooth lifting and lowering process of the upper and lower pressure heads on the one hand, and prevent the NdFeB powder in the mold cavity from escaping from the mold cavity through the gap between the lower pressure head and the mold cavity on the other hand.

[0029] Embodiment 6: This embodiment is basically the same as Embodiment 2, except that, in this embodiment, the left magnetic conductive side plate 4 and the right magnetic conductive side plate 5 use the same magnetic conductive material, and the magnetic permeability of the magnetic conductive material used in the magnetic conductive block 3 is higher than the magnetic permeability of the magnetic conductive material used in the left magnetic conductive side plate 4 and the right magnetic conductive side plate 5.

[0030] In this embodiment, the left magnetic conductive side plate 4 and the right magnetic conductive side plate 5 are made of the same magnetic conductive material, which can ensure the consistency of the magnetic fields of the two mold cavities. The magnetic permeability of the magnetic conductive material used in the magnetic block 3 is higher than the magnetic permeability of the magnetic conductive material used in the left magnetic conductive side plate 4 and the right magnetic conductive side plate 5, which can slow down the deviation of the magnetic circuit in the forward and backward directions, and make the radially oriented magnetic circuit gather towards the magnetic conductive block.

[0031] The present invention also discloses a forming method of the above-mentioned forming device of the tile-shaped radiation magnetic steel for the permanent magnet servo motor. The forming method of the forming device of the tile-shaped radiation magnetic steel for the permanent magnet servo motor of the present invention is further described in detail below in conjunction with the embodiments of the accompanying drawings.

[0032] Embodiment 1: A forming method of a forming device for a tile-shaped radiation magnetic steel for a permanent magnet servo motor, comprising the following steps: Step 1, control the two pressing heads to enter the preset positions in the two mold cavities from the bottom of the two mold cavities one by one; Step 2: vibrate the two lower pressure heads; Step 3: Fill the preset weight of NdFeB powder for preparing tile-shaped radiation magnets into two mold cavities. The weight of NdFeB powder in the two mold cavities is equal, and the average particle size of NdFeB powder is 3~5μm. The loose density of NdFeB powder in each mold cavity is 2.1~2.4g / cm 3 ; Step 4: Control the two upper pressing heads to enter the preset pre-pressing positions in the two cavities from above the two cavities one by one and then stop to complete the pre-pressing. At this time, the density formed in each cavity is 2.3~3.0g / cm 3 Pre-pressed green body; Step 5, turn on the magnetizing coil to magnetize and orient the pre-pressed green body. At this time, the right side surface of the left magnetic conductive side plate 4 and the left side surface of the magnetic conductive block 3 refract the magnetic force lines to form a magnetic field radiation distribution area, and the left side surface of the right magnetic conductive side plate 5 and the right side surface of the magnetic conductive block 3 refract the magnetic force lines to form a magnetic field radiation distribution area, thereby forming two magnetic field radiation distribution areas that are symmetrically distributed on the left and right. Since the two mold cavities are located in the two magnetic field radiation distribution areas in a one-to-one correspondence, the magnetization orientation of the pre-pressed green bodies inside the two mold cavities is achieved; Step 6: After the magnetization orientation is completed, the magnetization coil is turned off and the vibration of the two lower pressure heads is stopped; Step 7: Continue to control the two upper pressing heads to move downward to the preset pressing position and stop, and then complete the demagnetization. At this time, the density formed in each mold cavity is 3.9~4.2g / cm 3 The green body of the molding; Step 8: Control the two upper pressing heads and the two lower pressing heads to reset and demold the molded green body in each mold cavity.

[0033] In this embodiment, a magnetic conductive block 3, a left magnetic conductive side plate 4 and a right magnetic conductive side plate 5 are arranged in the molding device, and a magnetic field radiation distribution area is formed between the magnetic conductive block 3 and the left magnetic conductive side plate 4 and between the magnetic conductive block 3 and the right magnetic conductive side plate 5, respectively. The two mold cavities are located in the two symmetrically distributed magnetic field radiation distribution areas formed, so that a single mold and a single production of two-stage molding green billets can be achieved, which greatly improves the production efficiency. In the process of filling the NdFeB powder into the two mold cavities, the fluidity of the NdFeB powder is improved by vibrating the two lower pressure heads, so that the density distribution of the NdFeB powder in the mold cavity during the pressing process is more uniform, and the density of the NdFeB powder is formed by pre-pressing and molding. 2.3~3.0g / cm 3 After pre-pressing the green body, it is magnetized and oriented by the radiation magnetic field in two symmetrically distributed magnetic field radiation distribution areas, so as to further improve the consistency of the green body orientation, thereby solving the problems of large green body deformation and green body cracking, and avoiding the problem of parting surface cracking caused by multiple powder feeding and pressing in the prior art.

[0034] Embodiment 2: This embodiment is basically the same as Embodiment 1, except that, in this embodiment, in step 2, the two pressing heads are vibrated by a pulse vibration device, and the vibration frequency of the two pressing heads reaches 20 Hz to 200 Hz.

[0035] In summary, the forming device and forming method of the tile-shaped radiation magnetic steel for permanent magnet servo motor of the present invention improve the existing forming device and forming method, and additionally set a magnetic conductive block 3, a left magnetic conductive side plate 4 and a right magnetic conductive side plate 5, so that a magnetic field radiation distribution area is formed between the magnetic conductive block 3 and the left magnetic conductive side plate 4 and between the magnetic conductive block 3 and the right magnetic conductive side plate 5 respectively. Compared with the existing forming device structure radiating from one side to the other side, two mold cavities with the same orientation angle and the same magnetic field size can be set within the magnetic field distribution range, that is, two mold cavities can be set in two symmetrically distributed magnetic field radiation distribution areas, so that single-mode single-time production of two-stage forming green billets can be achieved, greatly improving production efficiency, and, during forming, in the process of filling the NdFeB powder into the two mold cavities, the fluidity of the NdFeB powder is improved by vibrating the two lower pressure heads, so that the density distribution of the NdFeB powder in the mold cavity during the pressing process is more uniform, and the density of the NdFeB powder is formed by pre-pressing to form a density of 2.3~3.0g / cm 3 After the pre-pressed green body is magnetized and oriented by the radiation magnetic field in the two symmetrically distributed magnetic field radiation distribution areas, the consistency of the green body orientation is further improved. Therefore, the forming device and forming method of the tile-shaped radiation magnetic steel for the permanent magnet servo motor of the present invention can make the orientation field distribution of the tile-shaped radiation magnetic steel uniform, improve the consistency of the radial orientation radiation angle distribution of the tile-shaped radiation magnetic steel, and have high production efficiency and low risk of forming fracture, and have broad application prospects and significance.

Claims

1. A forming device for a tile-shaped radiation magnetic steel for a permanent magnet servo motor, comprising a female mold and a forming press, wherein the female mold is made of a non-magnetic material, and is characterized in that The female mold itself is symmetrical about a certain plane, and the plane is called the first symmetrical plane. The female mold itself is symmetrical about a certain plane, and the plane is called the second symmetrical plane. A magnetic conductive cavity and two mold cavities are provided on the female mold. The magnetic conductive cavity and the two mold cavities both penetrate the female mold from top to bottom. The shapes of the two mold cavities match the shape of the tile-shaped radiant magnetic steel. The magnetic conductive cavity itself is symmetrical about the first symmetrical plane, and is symmetrical about the second symmetrical plane. The two mold cavities are respectively located on the left and right sides of the magnetic conductive cavity, and the two mold cavities are symmetrical about the first symmetrical plane. Each mold cavity It is symmetrical front to back about the second symmetry plane, a magnetic block that completely fills the magnetic cavity is arranged in the magnetic cavity, a left magnetic side plate is arranged on the left side of the female mold, and a right magnetic side plate is arranged on the right side of the female mold, the left magnetic side plate and the right magnetic side plate are symmetrical left to right about the first symmetry plane, the left magnetic side plate itself is symmetrical front to back about the second symmetry plane, and the right magnetic side plate itself is symmetrical front to back about the second symmetry plane; the molding press has two upper pressing heads and two lower pressing heads, the two lower pressing heads are matched with the two mold cavities one-to-one, and the two upper pressing heads are matched with the two mold cavities one-to-one.

2. The forming device of a tile-shaped radiation magnetic steel for a permanent magnet servo motor according to claim 1 is characterized in that The outer side wall of the female mold is surrounded by six side surfaces distributed in six directions: upper, lower, front, rear, left, and right. The upper, lower, front, and rear side surfaces of the female mold are all planes, and the left and right side surfaces are both arc cylinders. The left side surface and the right side surface of the female mold are bilaterally symmetrical with respect to the first symmetry plane, the front side surface and the rear side surface of the female mold are front-to-back symmetrical with respect to the second symmetry plane, the left side surface of the female mold itself is front-to-back symmetrical with respect to the second symmetry plane, the right side surface of the female mold itself is front-to-back symmetrical with respect to the second symmetry plane, the front side surface of the female mold itself is bilaterally symmetrical with respect to the first symmetry plane, and the rear side surface of the female mold itself is bilaterally symmetrical with respect to the first symmetry plane; The outer wall of the magnetic conductive cavity is surrounded by six side surfaces distributed in six directions: upper, lower, front, rear, left, and right. The upper and lower side surfaces of the magnetic conductive cavity are both planes, the left and right side surfaces are both arc cylinders convex outward, the front and rear side surfaces are both arc cylinders convex inward or both are arc cylinders convex outward, the left side surface and the right side surface of the magnetic conductive cavity are bilaterally symmetrical with respect to the first symmetry plane, the front side surface and the rear side surface of the magnetic conductive cavity are front-to-back symmetrical with respect to the second symmetry plane, the left side surface of the magnetic conductive cavity itself is front-to-back symmetrical with respect to the second symmetry plane, the right side surface of the magnetic conductive cavity itself is front-to-back symmetrical with respect to the second symmetry plane, the front side surface of the magnetic conductive cavity itself is bilaterally symmetrical with respect to the first symmetry plane, and the rear side surface of the magnetic conductive cavity itself is bilaterally symmetrical with respect to the first symmetry plane; The left side of the magnetic conductive cavity is coaxial with the left side of the female mold, and the right side of the magnetic conductive cavity is coaxial with the right side of the female mold; The left magnetic conductive side plate is formed by opening a circular arc cylinder concave to the left side on the right side surface of a rectangular block, the circular arc cylinder of the left magnetic conductive side plate is completely fitted with the left side surface of the female mold, the upper side surface of the left magnetic conductive side plate and the upper side surface of the female mold are located in the same plane, and the lower side surface of the left magnetic conductive side plate and the lower side surface of the female mold are located in the same plane; the right magnetic conductive side plate is formed by opening a circular arc cylinder concave to the right side on the left side surface of a rectangular block, the circular arc cylinder of the right magnetic conductive side plate is completely fitted with the right side surface of the female mold, the upper side surface of the right magnetic conductive side plate and the upper side surface of the female mold are located in the same plane, and the lower side surface of the right magnetic conductive side plate and the lower side surface of the female mold are located in the same plane; the left magnetic conductive side plate itself is front-to-back symmetrical with respect to the second symmetry plane, and the right magnetic conductive side plate itself is front-to-back symmetrical with respect to the second symmetry plane; A first rectangular cavity is formed between the front part of the right side surface of the left magnetic conductive side plate, the front side surface of the female mold and the front part of the left side surface of the right magnetic conductive side plate, a front stopper is arranged in the first rectangular cavity, and the front stopper just completely fills the first rectangular cavity; the left magnetic conductive side plate and the right magnetic conductive side plate are respectively fixedly connected to the front stopper, a second rectangular cavity is formed between the rear side of the right side surface of the left magnetic conductive side plate, the rear side surface of the female mold and the rear side of the left side surface of the right magnetic conductive side plate, a rear stopper is arranged in the second rectangular cavity, and the rear stopper just completely fills the second rectangular cavity; the front stopper and the rear stopper are both made of non-magnetic materials, and the left magnetic conductive side plate and the right magnetic conductive side plate are respectively fixedly connected to the rear stopper.

3. The forming device of a tile-shaped radiation magnetic steel for a permanent magnet servo motor according to claim 2 is characterized in that The left magnetic conductive side plate and the right magnetic conductive side plate are respectively fixedly connected to the front stopper by bolts, and the left magnetic conductive side plate and the right magnetic conductive side plate are respectively fixedly connected to the rear stopper by bolts.

4. The forming device of a tile-shaped radiation magnetic steel for a permanent magnet servo motor according to claim 2, characterized in that Each of the mold cavities is tile-shaped, the mold cavity on the left is called the left mold cavity, and the mold cavity on the right is called the right mold cavity. The left mold cavity is surrounded by six side surfaces distributed in six directions: upper, lower, front, rear, left and right. The upper side surface and the lower side surface of the left mold cavity are both planes, the upper side surface of the left mold cavity is flush with the upper side surface of the female mold, and the lower side surface of the left mold cavity is flush with the lower side surface of the female mold. The left side surface and the right side surface of the left mold cavity are both arc cylinders convex to the left, the left side surface and the right side surface of the left mold cavity are coaxial, the front side surface and the rear side surface of the left mold cavity are both planes, and the front side surface and the rear side surface of the left mold cavity can intersect after extending to the right; the maximum distance between the front side surface and the rear side surface of the left mold cavity is less than or equal to 0.5 times the distance between the front side surface and the rear side surface of the female mold; the radius of the right side surface of the left mold cavity is greater than the radius of the left side surface of the female mold.

5. The device for forming a tile-shaped radiant magnetic steel for a permanent magnet servo motor according to claim 1, characterized in that Each lower pressure head is provided with a pulse vibration device for making it vibrate. When the two lower pressure heads enter the two mold cavities one by one from the bottom of the two mold cavities, the gap between each lower pressure head and the mold cavity in which it is located is 0.04mm~0.3mm; when the two upper pressure heads enter the two mold cavities one by one from the top of the two mold cavities, the gap between each upper pressure head and the mold cavity in which it is located is 0.04mm~0.3mm.

6. The device for forming a tile-shaped radiant magnetic steel for a permanent magnet servo motor according to claim 1, characterized in that The left magnetic conductive side plate and the right magnetic conductive side plate are made of the same magnetic conductive material, and the magnetic permeability of the magnetic conductive material used in the magnetic conductive block is higher than the magnetic permeability of the magnetic conductive material used in the left magnetic conductive side plate and the right magnetic conductive side plate.

7. A forming method of a forming device for a permanent magnet servo motor according to any one of claims 1 to 6, characterized in that The following steps are involved: Step 1, control the two pressing heads to enter the preset positions in the two mold cavities from the bottom of the two mold cavities one by one; Step 2: vibrate the two lower pressure heads; Step 3: Fill the preset weight of NdFeB powder for preparing tile-shaped radiation magnets into two mold cavities. The weight of NdFeB powder in the two mold cavities is equal, and the average particle size of NdFeB powder is 3~5μm. The loose density of NdFeB powder in each mold cavity is 2.1~2.4g / cm 3 ; Step 4: Control the two upper pressing heads to enter the preset pre-pressing positions in the two cavities from above the two cavities one by one and then stop to complete the pre-pressing. At this time, the density formed in each cavity is 2.3~3.0g / cm 3 Pre-pressed green body; Step 5, turn on the magnetizing coil to magnetize and orient the pre-pressed green body. At this time, the right side surface of the left magnetic conductive side plate and the left side surface of the magnetic conductive block refract the magnetic force lines to form a magnetic field radiation distribution area, and the left side surface of the right magnetic conductive side plate and the right side surface of the magnetic conductive block refract the magnetic force lines to form a magnetic field radiation distribution area, thereby forming two magnetic field radiation distribution areas symmetrically distributed on the left and right. Since the two mold cavities are located in the two magnetic field radiation distribution areas in a one-to-one correspondence, the magnetization orientation of the pre-pressed green body inside the two mold cavities is achieved; Step 6: After the magnetization orientation is completed, the magnetization coil is turned off and the vibration of the two lower pressure heads is stopped; Step 7: Continue to control the two upper pressing heads to move downward to the preset pressing position and stop, and then complete the demagnetization. At this time, the density formed in each mold cavity is 3.9~4.2g / cm 3 The green body of the molding; Step 8: Control the two upper pressing heads and the two lower pressing heads to reset and demold the molded green body in each mold cavity.

8. The forming method of the forming device of the tile-shaped radiation magnetic steel for the permanent magnet servo motor according to claim 7, characterized in that In the step 2, the two pressing heads are vibrated by a pulse vibration device, and the vibration frequency of the two pressing heads reaches 20 Hz to 200 Hz.

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