Method of moulding radial ring magnet and device thereof

Method and apparatus for forming radiation-oriented annular magnets

The present invention relates to a method and apparatus for making a radiation-oriented annular magnetic material, and more particularly to a method and apparatus for forming an annular magnet that is radially oriented in a radius or diameter direction.

technical background

Annular magnets (abbreviated as radiating rings) that radiate in a radius or diameter direction have broad application prospects in the field of motors. The biggest technical difficulty in making a radiation ring is the orientation of the magnetic powder in the forming (or molding) stage. At present, there are two main orientation methods applied in the magnetic material industry: The first one is the segmentation orientation method, which divides the ring into several parts and introduces an orientation magnetic field for each part to be oriented. The biggest disadvantage of this method is that the degree of orientation is not uniform, some parts have a high degree of orientation, and some parts have a low degree of orientation. The uneven degree of orientation not only seriously affects the overall magnetic properties of the radiation ring, but also causes the radiation ring to crack due to the different shrinkage rates of the different orientation sites during the sintering process, which reduces the magnetic properties and yield of the radiation ring, and the manufacturing cost. increase. The second method is the extrusion magnetic field orientation method, which is to adjust the current direction of the upper and lower coils to generate a same pole (N pole or S pole) magnetic field between the coil poles, and squeeze the same pole magnetic field. The inner cavity of the radiation ring mold is then passed through a magnetic guiding device to form a radiation magnetic field. The method improves the uniformity of the orientation magnetic field. The biggest disadvantage is that the intensity of the orientation magnetic field obtained when the inner diameter of the radiation ring is small is greatly reduced, so that the orientation of the magnetic powder is incomplete (the first orientation method also has similar defects). When the height of the radiation ring is high, not only the strength of the orientation magnetic field is weakened but the uniformity is deteriorated, which deteriorates the magnetic properties and uniformity of the radiation ring. Method of moulding radial ring magnet and device thereof

Summary of the invention

The object of the present invention is to provide a method and a device for forming a radiation-oriented annular magnet. The technical problem to be solved is that not only can the magnetic powder be uniformly oriented but also the inner diameter can be produced when the radiation ring is fabricated. A large orientation field can also be obtained when the radiation ring is small and/or high, so that the magnetic properties and uniformity of the radiation ring are greatly improved. Method of moulding radial ring magnet and device thereof

moulding radial ring magnet

moulding radial ring magnet

The invention adopts the following technical solutions: A method for forming a radiation-oriented annular magnet, the magnetic powder is placed in a circular cavity, and the magnetic powder in the annular cavity is radiated along the radius or the diameter by the orientation magnetic field. Orientation, the orientation magnetic field during the molding process is intermittently distributed at a 360° angle of the annular magnet, and the relative magnetic motion between the orientation magnetic field and the magnetic powder during the molding process is relatively rotational; the relative rotational motion is in the annular cavity The inner magnetic pole of the magnetic powder and the orienting magnetic field is stationary, and the outer magnetic pole of the oriented magnetic field is rotated; or the outer magnetic pole is stationary, the magnetic powder and the inner magnetic pole in the annular cavity are rotated; or the first outer magnetic pole and the second outer magnetic field are oriented The magnetic pole rotates around the magnetic powder in the annular cavity, and the magnetic powder in the annular cavity is stationary; or the first outer magnetic pole and the second outer magnetic pole are stationary, and the magnetic powder in the annular cavity rotates.

In the method of the invention, the inner edge of the outer magnetic pole is fixedly connected with the collecting head, the collecting head and the outer magnetic pole are simultaneously rotated, or the inner edge of the outer magnetic pole is movably connected with the collecting head, and the collecting head performs a rotating motion.

The number of outer magnetic poles of the method of the invention is at least one.

The number of the first outer magnetic poles of the method of the present invention is at least one, and the number of the second outer magnetic poles is at least one zero.

The orientation magnetic field between the inner and outer magnetic poles of the method of the present invention, or the orientation magnetic field between the first outer magnetic pole and the second outer magnetic pole, is a constant magnetic field, a regularly varying magnetic field, or an irregularly varying magnetic field.

The magnetic field between the inner and outer magnetic poles of the method of the present invention, or the magnetic field between the first outer magnetic pole and the second outer magnetic pole, is generated by an electromagnet, generated by a permanent magnet, or co-generated by an electromagnet and a permanent magnet.

A molding apparatus for a radiation-oriented annular magnet, wherein an annular cavity is provided in an orientation magnetic field, and an orientation magnetic field is intermittently distributed at a 360° angle of the annular magnet, and one magnetic pole in the orientation magnetic field is another Between the magnetic poles, or between the annular cavity and the orientation magnetic field, a structure having a relative rotational motion is formed, and the structure of the relative rotational motion is that the outer magnetic pole of the orientation magnetic field is fixed on the frame of the molding apparatus, the annular cavity and The inner magnetic pole of the orientation magnetic field is connected to the rotation driving mechanism; or the inner magnetic pole of the annular cavity and the orientation magnetic field is fixed on the frame of the molding device, and the outer magnetic pole of the orientation magnetic field is connected to the rotation driving mechanism; or the first outer magnetic pole of the orientation magnetic field and The second outer magnetic pole is connected to the rotary driving mechanism, and the annular cavity is fixed on the frame of the molding device; or the first outer magnetic pole and the second outer magnetic pole are fixed on the frame of the molding device, and the annular cavity is connected and rotated Drive mechanism.

The outer magnetic pole inner edge of the device of the invention is fixedly connected or movably connected with a collecting head.

The number of outer magnetic poles of the apparatus of the present invention is at least one.

The apparatus of the present invention has at least one first outer magnetic pole and at least one second outer magnetic pole.

Compared with the prior art, the orientation magnetic field in the molding process is intermittently distributed at a 360° angle of the annular magnet, and the relative magnetic motion between the orientation magnetic field and the magnetic powder during the molding process is oriented due to the 360° orientation. The magnetic field is the same magnetic field, so the orientation of the magnetic powder is more complete, and the degree of orientation of the radiation ring is uniform at different angles. It can be used to prepare sintered radial ring magnets, and can also be used to prepare bonded radiation ring magnets and injection molded radiation ring magnets. Method of moulding radial ring magnet and device thereof

DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view showing the magnetic field of an external magnetic pole type (i) in an embodiment of the present invention. Method of moulding radial ring magnet and device thereof

2 is a schematic view showing an exemplary magnetic pole-external magnetic pole orientation magnetic field according to the present invention.

3 is a schematic view showing a magnetic pole-external magnetic pole (2) orientation magnetic field in an embodiment of the present invention.

detailed description

The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. No. in the drawing: 1. Inner magnetic pole (can be used as a core when selecting a hard magnetic material); 2. Cavity; 3. Non-magnetic mold; 4. External magnetic pole; 5. External magnetic pole; Magnetic core (can be used as a core when a harder magnetic material is used); 7. First outer magnetic pole; 8. Second outer magnetic pole. The method of the present invention is implemented as follows: The orientation magnetic field is changed from the currently widely used 360° continuous distribution (or approximately 360° continuous distribution) to a discontinuous distribution (the inner magnetic pole and the outer magnetic pole orientation magnetic field may be used for implementation or external Magnetic pole-external magnetic pole orientation magnetic field), that is, the orientation magnetic field in the forming process is intermittently distributed at the 360 Q angle of the ring magnet, and the relative state of the magnetic powder and the magnetic field during the molding process is relatively static (or approximately relative) which is generally used at present. Static) becomes a relative rotational motion. The magnetic pole-external magnetic pole oriented magnetic field in the device of the present invention is changed from a conventional continuous ring type (or approximately continuous ring type) to an independent or discrete collecting head by an external magnetic conducting device for orienting the radiation ring to the magnetic field, so that the radiation is transmitted. The magnetic field of the ring cavity is concentrated to obtain a larger orientation magnetic field. Since the orientation magnetic field employed in the present invention is discontinuously distributed, in order to orient the magnetic powder in the mold in the 360° direction, the present invention changes the relative state of the magnetic powder and the magnetic field from the relatively static (or approximately relatively static) currently employed. There is a relative rotational motion. If the magnetic powder is relatively stationary, the 360° orientation of the magnetic powder can be completed when the discontinuously distributed orienting magnetic field is rotated 360° or more around the radiation ring cavity; if the discontinuous distributed orientation magnetic field used in the present invention is relatively stationary, the cavity is allowed to be made. The magnetic powder in the magnetic field can also complete the 360° orientation of the magnetic powder when rotated more than 360° in the magnetic field; if the magnetic powder in the cavity and the discontinuous distributed orientation magnetic field used in the present invention rotate simultaneously, as long as the movement of the magnetic powder and the magnetic field are not synchronized Can complete the 360° orientation of the magnetic powder. Since the magnetic field used in the invention is relatively high, the orientation of the magnetic powder is more complete; since the orientation magnetic field in the 360° direction is the same magnetic field, the degree of orientation of the radiation ring at different angles is uniform. Therefore, the present invention better solves the technical problems that the current orientation magnetic field is generally low in the production of the radiation ring, resulting in incomplete magnetic powder orientation and uneven magnetic field distribution, resulting in poor consistency of magnetic properties of the product.

Example 1 : A radiation ring was fabricated using an inner magnetic pole and an outer magnetic pole oriented magnetic field.

As shown in Fig. 1, when the two poles (N pole and S pole) of the magnetic field generated by the electromagnet or the permanent magnet are respectively introduced into the inner magnetic pole 1 and the outer magnetic pole 5 through a certain magnetic guiding device, the inner magnetic pole 1 and the outer magnetic pole 1 A strong magnetic field is formed between the magnetic poles 4 . If the cavity 2 is filled with magnetic powder at this time, it is in the magnetic bucket. The magnetic powder in the field will be sufficiently magnetized and oriented. If the outer magnetic pole magnetic head 4 is fixed on the outer magnetic pole 5, the magnetization and radiation orientation of all the magnetic powder in the cavity 2 can be realized by the motor driving the outer magnetic pole 5 at a high speed. For the magnetization and orientation of the magnetic powder in the cavity 2, press forming of the radiation ring blank can be accomplished by applying a stepwise increase in pressure according to the prior art press forming method. If the outer magnetic pole 5 and the outer magnetic pole collecting head 4 are movably connected, the same purpose can be achieved by the motor driving the outer magnetic pole collecting head 4 to rotate. After the molding is completed, it is only necessary to introduce a reverse magnetic field having an opposite direction to the direction of the orientation magnetic field between the inner magnetic pole 1 and the outer magnetic pole 5 to achieve demagnetization of the radiation ring blank. The radiation ring blank formed by the above method is subjected to sintering and heat treatment which are generally used at present to form a radiation ring blank, and the finishing of the radiation ring is completed after finishing. In the present embodiment, if the outer magnetic pole 5 and the outer magnetic pole magnetic head 4 are not rotated but the magnetic powder in the mold 3 and the cavity 2 is rotated, the purpose of the magnetic powder radiation orientation can be achieved. In the present embodiment, we may use only one outer magnetic pole collecting head 4, or a plurality of collecting heads 4. In addition, the magnetic field introduced between the inner magnetic pole 1 and the outer magnetic pole 5 may be a constant magnetic field, a regularly varying magnetic field (such as a pulsed magnetic field), or an irregularly varying magnetic field. Method of moulding radial ring magnet and device thereof

Embodiment 2: Making a radiation ring by using an external magnetic pole and an external magnetic pole oriented magnetic field

As shown in FIG. 2, when the two poles (N pole and S pole) of the magnetic field generated by the electromagnet or the permanent magnet are respectively introduced into the first outer magnetic pole 7 and the second outer magnetic pole 8 through a certain magnetic guiding device, Two strong magnetic fields are simultaneously formed between the magnetic core 6 and the first outer magnetic pole 7, and between the magnetic core 6 and the second outer magnetic pole 8. If the cavity 2 is filled with magnetic powder at this time, the magnetic powder in both magnetic fields will be sufficiently magnetized and oriented. The magnetization and orientation of all the magnetic powder in the cavity 2 can be realized by the motor driving the first outer magnetic pole 7 and the second outer magnetic pole 8 at the same time and rotating at a high speed. Simultaneously with the magnetization and orientation of the magnetic powder in the cavity 2, the pressing of the radiation ring blank can be completed by applying a step-increasing pressure according to the prior art press forming method. After the molding is completed, it is only necessary to introduce a step-down magnetic field between the first outer magnetic pole 7 and the second outer magnetic pole 8 to achieve demagnetization of the radiation ring blank. The radiation ring blank formed in accordance with the above method is The radiation ring blank is made by sintering and heat treatment which are generally used at present, and the production of the radiation ring is completed after subsequent processing. In the present embodiment, if the first outer magnetic pole 7 and the second outer magnetic pole 8 are not rotated but the magnetic powder in the cavity 2 is rotated, the purpose of the magnetic powder radiation orientation can be achieved. In this embodiment, we only use one outer magnetic pole (the first outer magnetic pole 7 and the second outer magnetic pole 8), or multiple outer magnetic poles or even an odd outer magnetic pole (for example, three outer magnetic poles, one N pole, two S pole, etc.). The magnetic field introduced between the first outer magnetic pole 7 and the second outer magnetic pole 8 may be a constant magnetic field, a regularly varying magnetic field (such as a pulsed magnetic field), or an irregularly varying magnetic field.

Example 3: Another method for making a radiation ring using an inner magnetic pole and an outer magnetic pole oriented magnetic field

As shown in FIG. 3, when the two poles (N pole and S pole) of the magnetic field generated by the electromagnet or the permanent magnet are respectively introduced into the inner magnetic pole 1 and the outer magnetic pole 5 through a certain magnetic guiding device, the inner magnetic pole 1 and the outer magnetic pole 1 A strong magnetic field is formed between the magnetic poles 4 . If the cavity 2 is filled with magnetic powder at this time, the magnetic powder in the magnetic field will be sufficiently magnetized and oriented. If (1) the magnetic non-magnetic mold 3, the magnetic powder in the cavity 2 and the inner magnetic pole 1 are fixed on the frame of the molding apparatus, relatively stationary, the outer magnetic pole 5 and the magnetic head 4 are connected to the rotary drive mechanism, and surround the non-magnetic mold 3 The magnetic powder and the inner magnetic pole 1 in the cavity 2 are rotated; or (2) the outer magnetic pole 5 and the magnetic head 4 are fixed on the frame of the molding apparatus, relatively stationary, and the non-magnetic mold 3 and the cavity 2 are The magnetic powder and the inner magnetic pole 1 are connected to the rotary driving mechanism, and the magnetization and radiation orientation of all the magnetic powder in the cavity 2 can be realized by the rotary motion. While the magnetic powder in the cavity 2 is magnetized and oriented, press molding of the radiation ring blank can be accomplished by applying a stepwise increase in pressure according to the prior art press forming method. In the present embodiment, we can use only one set of outer magnetic poles 5 and poly magnetic heads 4, but it is also possible to use multiple sets at the same time. Further, the magnetic field introduced between the inner magnetic pole 1 and the outer magnetic pole 5 may be a constant magnetic field, a regularly varying magnetic field (e.g., a pulsed magnetic field), or an irregularly varying magnetic field. Method of moulding radial ring magnet and device thereof

A method for molding a radiation-oriented annular magnet, the magnetic powder is placed in an annular cavity (2), and the magnetic powder in the annular cavity (2) is radially or diametrically oriented by an orientation magnetic field Radiation orientation, characterized in that the orientation magnetic field is intermittently distributed at a 360° angle of the annular magnet during the molding process, and the relative rotational motion between the orientation magnetic field and the magnetic powder during the molding process; the relative rotational motion is a ring The magnetic powder in the cavity (2) and the inner magnetic pole (1) of the orientation magnetic field are stationary, the outer magnetic pole (5) of the orientation magnetic field is rotated, or the outer magnetic pole (5) is stationary, in the annular cavity (2) The magnetic powder and the inner magnetic pole (1) are rotated; or the first outer magnetic pole (7) and the second outer magnetic pole (8) of the orienting magnetic field are rotated around the magnetic powder in the annular cavity (2), the annular mold The magnetic powder in the cavity (2) is stationary; or the first outer magnetic pole (7) and the second outer magnetic pole (8) are stationary, and the magnetic powder in the annular cavity (2) is rotated. Method of moulding radial ring magnet and device thereof
2. The method for molding a radiation-oriented annular magnet according to claim 1, wherein: the inner edge of the outer magnetic pole (5) is fixedly connected to the collecting head (4), and the collecting head (4) and the outer magnetic pole (5) Simultaneously do the rotary motion, or the inner edge of the outer magnetic pole (5) is movably connected with the collecting head (4), and the collecting head (4) is rotated.
The method of molding a radiation-oriented annular magnet according to claim 2, wherein the number of the outer magnetic poles (5) is at least one.
The method for molding a radiation-oriented annular magnet according to claim 2, wherein: the number of the first outer magnetic poles (7) is at least one, and the number of second outer magnetic poles (8) At least one.
The method for molding a radiation-oriented annular magnet according to any one of claims 1 to 4, characterized by: an orientation magnetic field between the inner magnetic pole (1) and the outer magnetic pole (5), or The orientation magnetic field between an outer magnetic pole (7) and a second outer magnetic pole (8) is a constant magnetic field, a regularly varying magnetic field or irregularity Then the changing magnetic field.
6. The method of forming a radiation-oriented annular magnet according to claim 5, wherein: a magnetic field between the inner magnetic pole (1) and the outer magnetic pole (5), or a first outer magnetic pole The magnetic field between (7) and the second outer magnetic pole (8) is generated by an electromagnet, generated by a permanent magnet or produced by an electromagnet and a permanent magnet.
A molding apparatus for a radiation-oriented annular magnet, wherein an annular cavity (2) is provided in an orientation magnetic field, wherein: the orientation magnetic field is intermittently distributed at a 360° angle of the annular magnet, A structure having a relative rotational motion between a magnetic pole and another magnetic pole in the orientation magnetic field, or an annular cavity (2) and an orientation magnetic field, and a structure of a relative rotational motion is an external magnetic pole (5) of the orientation magnetic field fixed in the molding On the frame of the device, the annular cavity (2) and the inner magnetic pole (1) of the orientation magnetic field are connected to the rotary drive mechanism; or the annular cavity (2) and the inner magnetic pole (1) of the orientation magnetic field are fixed in the molding device. On the frame, the outer magnetic pole (5) of the oriented magnetic field is connected to the rotary drive mechanism; or the first outer magnetic pole (7) and the second outer magnetic pole (8) of the orientation magnetic field are connected to the rotary drive mechanism, and the annular cavity (2) It is fixed to the frame of the molding apparatus; or the first outer magnetic pole (7) and the second outer magnetic pole (8) are fixed to the frame of the molding apparatus, and the annular cavity (2) is connected to the rotary driving mechanism. Method of moulding radial ring magnet and device thereof
8. The apparatus for molding a radiation-oriented annular magnet according to claim 6, characterized in that: the outer magnetic pole (5) is fixedly connected or movably connected to the inner edge of the outer magnetic pole (5).
9. The apparatus for molding a radiation-oriented annular magnet according to claim 8, characterized in that the number of the outer magnetic poles (5) is at least one.
The apparatus for molding a radiation-oriented annular magnet according to claim 8, wherein: the number of the first outer magnetic poles (7) is at least one, and the number of the second outer magnetic poles (8) At least one.

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