JPS62261110A - Permanent magnet manufacturing method - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a method for manufacturing a permanent magnet [Prior Art] A cylindrical magnet made by bonding rare earth cobalt magnetic powder with a resin? In the 1-1 method, magnetic powder and a thermosetting resin binder were kneaded, pressure molded in a magnetic field or without applying a magnetic field, cured, and magnetized to obtain a magnet. Application fields of the obtained magnets include motors. For example, in step motors, in order to bring out the full performance of the magnet, radial anisotropy is imparted to the magnet during molding, and a bank yoke made of soft magnetic material is used. A combination magnetic circuit was constructed.

The cylindrical magnet and the cylindrical bank yoke were processed separately, and a bank yoke K (D1 stone was incorporated and fixed with adhesive, and a rotor with 8 points was obtained by loading and unloading. If you want to make the rotor's inner 7 size smaller, you can combine an isotropic magnet with a metal material of low specific gravity like hL, and fix it with adhesive and magnetize it in the same way as the bank yoke. Got rotor.

[Problem that the invention seeks to solve]

In the above-mentioned conventional technology, the magnets and rotor or back yoke are processed separately and combined, which increases the cost due to the complexity of the process.In order to prevent eccentricity and eccentricity of the magnet, it is necessary to fit the magnets, low pitch, and bank yoke together. If it is too strict, even a slight misalignment will cause the magnet to break, the precision amplifier will increase processing costs, and the space between the magnet and the bank yoke will cause deterioration in magnet performance.

In the above configuration, it is difficult to make the magnet thin, and the thickness is 1
The problem is that the limit is up to fi, and the thickness makes multi-pole magnetization difficult. The present invention solves these problems, and its purpose is to provide a high-performance method for back-passing a magnet.

[Problem%’#Means to resolve]

The method for manufacturing a magnet of the present invention is a method for manufacturing a magnet in which a kneaded material whose main component is magnetic powder is melted and solidified by extrusion molding. A step of kneading a kneaded material mainly composed of I powder, b. A step of extruding the molten kneaded material on the outer periphery of a hollow pipe set in a die, and a step of passing the C1 kneaded material while forming and solidifying it. and (d) A method for producing a magnet, which comprises the steps of cutting the extruded molded product into appropriate lengths to obtain a magnet having a two-piece structure. (2) Putting the kneaded material inside a hollow pipe. Method for manufacturing a permanent magnet according to claim 1, characterized by extrusion [Examples] The present invention will be described in detail below with reference to Examples.

[Example-1] B m((61syl -CII..., F@1lff
i, Zr6JHI) &l was melted in a low frequency melting furnace, resulting in an alloy ingot Q11.
Solution treatment is carried out at 70°C for 4 hours, isothermal aging and cooling aging are combined to 800-200°C, and then the alloy ingot is coarsely pulverized and finely pulverized to obtain magnetic powder of about 10-20 μm. After surface-treating the magnetic powder with a titanate coupling agent, the mixture is mixed in a volumetric ratio of 60% magnetic powder and 40% polyamide resin (nylon 12) in the range of 220 to 250°C, and the kneaded material is 211ml1K is crushed and pelletized. The obtained pellet is melted using the extruder of the present invention shown in FIG. 1, and then extruded onto the outer periphery of a hollow pipe set in a die to obtain a magnet.

The pulverization will be explained below. The above-mentioned pellet is placed in a cylinder using a heater 2 to heat the melt 3 at a temperature in the range of 230 to 250°C.
get. The melt 5 is passed through the die 5 by rotating the screw 4.
It is extruded onto the outer periphery of a hollow pipe 6 set in the pipe 6 and covered with a hollow pipe 6. For the hollow vibro, the field that makes the magnet radially anisotropic is a soft magnetic material such as svy or 5I5C, and the field that is isotropic is made of a non-magnetic material such as kA.

Radial anisotropic magnet? When molding, the die 5 is composed of a non-magnetic material and the tip of the die 5 and the hollow pipe 6. It is composed of a yoke 7 and a coil 8 that applies an ai field so that magnetic flux flows (H indicates the flow of magnetic flux), and makes the melt 3 anisotropic in the radial direction.

In the case of isotropy, unlike the case of anisotropy, it is sufficient to simply extrude the melt without applying a magnetic field.

Next, the hollow pipe 6 is extruded in the F direction in synchronization with the extrusion speed of the melt 3, and the cooling die 1 is cooled by the cooling pipe 9.
0 through which the melt 5f2r solidifies and adheres to the hollow pipe 6. Next, it is cut to a predetermined required size and magnetized to obtain a two-piece magnet consisting of a magnet 11 and a hollow vibro as shown in FIG. If anisotropy is added, demagnetize g1 in advance before cutting.

[Example 2] A pellet made of magnetic powder was obtained in the same manner as in Example 1 above. The pellet is placed in a cylinder 1 shown in FIG. 3 using a heater 2 at a temperature of 250 to 250 DEG C. to obtain a melt 5. By rotating the screw 4, the melt 5 is extruded into a hollow vibro inserted at the tip of the die 5. The extruded melt 5 passes through a cooling die 10 cooled by a cooling pipe 9, and solidifies and adheres to a hollow pipe 6.

Next, it is cut to a predetermined size and magnetized to obtain a magnet with a two-piece structure consisting of the magnet 11 and the hollow vibro shown in Fig. @4. In this case, the hollow pipe 6 is made of magnetic material SUY, 5I5.
0 etc. or non-magnetic material At, 5US303
etc.

〔Effect of the invention〕

As described above, according to the Moto invention, by extruding and forming a magnet on the outside or inside of a medium-sized 9-pipe, it is possible to manufacture a magnet that has high mechanical precision, high magnetic properties, and does not break, even if it is a thin-walled magnet. Ta. A comparison of magnetic properties is shown below.

Table 1 The two-piece structure of the grinding stone eliminates the need for an assembly process, and since there is no gap between the puncture yoke and the magnet, a stable magnetic flux is produced.

By making the magnet thinner, it has become possible to magnetize it with as many as 100 poles. Also, the thinner walls have reduced the cost of using magnets.

[Brief explanation of drawings]

@Figure 1 is a diagram showing extrusion molding to the outside of a hollow pipe in this example, Figure 2 is a diagram showing a magnet obtained in this example,
FIG. 5 is a diagram showing extrusion molding into the inside of a hollow pipe according to this embodiment, and FIG. 4 is a diagram showing a magnet obtained according to this embodiment. 1...Cylinder 2-...Heater 3...Melted material 4...Screw 5...Die 6...Pipe assembly inside ... Yoke 8 ... Coil 9 ... Cooling pipe 10 ... Cooling die 11 ... Magnet F ... Extrusion direction H...Flow of magnetic flux・ Above Figure 1 Figure 2

Claims (1)

[Scope of Claims] A method for producing a permanent magnet in which a kneaded material containing magnetic powder as a main component is melted and solidified by extrusion molding, the method comprising the following production steps in sequence. (1) a. A step of melting a kneaded material mainly composed of magnetic powder, b. A step of extruding the molten kneaded material onto the outer periphery of a hollow pipe set in a die, and c. A step of molding and solidifying the kneaded material. (2) A method for manufacturing a permanent magnet, comprising the steps of passing the kneaded product through a hollow tube, and (d) cutting the extruded compact into an appropriate length to obtain a magnet having a two-piece structure. A method for producing a permanent magnet according to claim 1, characterized in that the permanent magnet is extruded into the inside of a pipe.