JPH06201808A - Magnetic material magnetic inspection device - Google Patents

Abstract

(57) [Summary] [Purpose] To enable a simple and highly reliable inspection when inspecting a magnet material at the stage of the magnet material to see if it produces an appropriate magnetic force when it becomes a magnet product. To do. [Structure] A magnet 6 for magnetizing such as a samarium-cobalt magnet is provided on the lower surface of a support base 5 made of a non-magnetic material such as stainless steel, and an electronic scale 7 is provided under the support base 5 at a certain distance from the magnet. The inspection magnetic body 8 such as a permendur is placed on top of this. The magnet material 1 is temporarily magnetized for inspection by the magnetizing magnet 6, and then transferred onto the inspection magnetic body 8, and at that time, the magnetic attraction force exerted on the inspection magnetic body 8 by the magnet material 1 causes an electron emission. The measured value of the scale 7 is apparently light. Magnet material 1
Is a magnet product, it is determined whether or not a proper specific magnetic force is generated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for inspecting magnetic force of a magnet material, and more particularly to an apparatus for inspecting at the stage of magnet material whether or not suitable magnetic characteristics can be exhibited when it becomes a magnet product.

[0002]

2. Description of the Related Art Alnico magnets have been known as cast magnets. This is a magnet product obtained by grinding a molded body that has been molded into a predetermined shape as necessary to a magnet material, and magnetizing this magnet material according to each application. For example, it is incorporated in a speedometer, a step motor, or the like. Therefore, it is the final magnet product to check whether it can exert an appropriate magnetic force when incorporated in such various applications, that is, to inspect the quality of the magnet material at the material stage and eliminate defective products. Is important to keep the credibility of the.

Regarding the quality judgment of such a magnet material,
Conventionally, after magnetizing a magnet material for inspection in advance, the magnet material is positioned in a measuring coil having two poles or four poles, and the magnetic force of the magnet material is electrically measured through the coil.
Those with inferior measured values were excluded as defective products.

By the way, in order to eliminate the complexity of the inspection by the conventional measuring coil, the present applicant faces the measuring magnet in a non-magnetized state without magnetizing the magnet material. At this time, the load of the inspection magnet is apparently reduced by the magnetic attraction force that acts between the inspection magnet and the magnet material, and by measuring this with a load measuring device, it becomes a product of the magnet material. In this case, a technology for predicting the magnetic characteristics in the case of occurrence and judging the quality thereof has been developed, and a patent has already been applied for this (Japanese Patent Application No. 3-206917). In this technology, those that generate a large magnetic attraction force with the inspection magnet at the stage of the unmagnetized magnet material tend to have poor magnetic characteristics (small magnetic flux) when it becomes a magnet product. Is used to eliminate the generated suction force that is too large.

[0005]

According to such an inspection method, it is possible to easily predict the magnetic characteristics when the product becomes a product at the stage of the magnet material and eliminate defective products in advance. Aims to further improve the reliability of the defective product prediction and to provide a technique capable of inspecting the magnet material as easily as possible.

[0006]

A magnetic force inspection device according to the present invention includes the following components. Material support: Supports a magnet material pre-magnetized for inspection at the magnetic force inspection position. Inspection magnetic body: Provided corresponding to the magnetic force inspection position. Then, it is arranged at a position where the magnetic attraction force of the magnetized magnet material supplied to the magnetic force inspection position is exerted. Measuring means: Measures the magnitude of the magnetic attraction force exerted on the magnetic material for inspection by the magnet material when the magnet material is positioned at the magnetic force inspection position.

As the measuring means for measuring the magnitude of the magnetic attraction force exerted on the magnetic material for inspection by the magnet material, for example, an electronic scale on which the magnetic material for inspection is mounted is used, and the magnetic force for inspection is used for the inspection. A magnetic material that utilizes the apparent reduction of the load on the magnetic material can be preferably used. In addition to this, for example, by deforming the measuring piece by displacement of the magnetic material for inspection,
The one using the change of the electric resistance value, or the one using the change of the electric capacity based on the displacement of the magnetic material for inspection,
Further, various types such as those utilizing changes in magnetostriction can be adopted.

The magnet material is magnetized in advance for the inspection, but it is possible to construct the magnetic force inspection device having the function of magnetizing. In that aspect, a magnetizing device for magnetizing the magnet material for inspection is provided on the upstream side of the magnetic force measurement position, and accordingly, the magnet material magnetized at the magnetizing position is sequentially moved to the magnetic force inspection position described above. A supply device can be provided.

[0009]

[Function] The magnet material magnetized for the inspection is supplied to the magnetic force inspection position so as to come close to the inspection magnetic body,
Due to the magnetic force generated between the two, a magnetic attraction force to the magnetic material side acts on the magnetic material for inspection, and the magnitude of the magnetic attraction force is measured, and the quality of the magnet material is determined by the measured value. . That is, if the magnetic attraction force is smaller than the set value, it is predicted that a proper magnetic force cannot be generated even if the magnet product is formally magnetized according to the application, so it is considered a defective product. It

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 4 and 5 show a material 1 of an alnico magnet (hereinafter referred to as a magnet material). This is a magnet product that is magnetized according to a predetermined use, and is incorporated in, for example, a speedometer. The magnet material 1 is in the form of a thin disk, and a center hole 2 is formed in the center of the magnet material so as to allow a predetermined axis to pass therethrough, and one plate surface has a recess for identifying the front and back sides. 3 is formed.

This magnet material 1 is formed by casting,
After that, both plate surfaces are flat-polished. And
The magnetic force inspection apparatus of this embodiment is used to inspect whether or not the magnet material 1 can exert an appropriate magnetic force when it becomes a magnet product at the stage of the magnet material. FIG. 3 shows the principle diagram.

In FIG. 3, reference numeral 5 denotes a non-magnetic support base made of, for example, non-magnetic stainless steel (SUS).
A magnetizing magnet 6 for temporarily magnetizing the magnet material 1 for inspection is fixed to the lower surface of the support 5. As the magnetizing magnet, for example, a samarium-cobalt (Sm-Co) magnet having two or four poles is used.

An electronic scale 7 is provided below the support 5 at a predetermined distance from the magnetizing magnet 6, and an inspection magnetic body 8 is mounted on the electronic scale 7. The inspection magnetic body 8 includes
For example, permendur, which is a ferromagnetic material, is adopted. The magnetic material 8 for inspection is positioned sufficiently away from the magnet 6 so that the magnetic force of the magnetizing magnet 6 is not exerted.

First, the magnet material 1 is placed directly above the magnetizing magnet 6 4
By being positioned at, it becomes a temporary magnet if it is temporarily magnetized for inspection. After that, the magnetized magnet material 1 is positioned directly above the inspection magnetic body 8.
At this time, the magnetic force of the magnetized magnet material 1 reaches the inspection magnetic body 8, and the inspection magnetic body 8 receives a magnetic attraction force from the magnet material 1 due to the magnetic force. As a result, the inspection magnetic body 8
The load exerted on the electronic scale 7 is reduced by the magnetic attraction force, and the inspection magnetic body 8 is in a state of being lighter than the electronic scale 7, and the measured value of the electronic scale 7 is reduced. The smaller the measured value is, the stronger the magnetic force of the magnet material 1 is, and the magnet 1 that has generated a magnetic force above a certain level will exhibit the same magnetic force even when it is formally magnetized as a magnet product. Is considered good. On the other hand, if the magnetic force is less than the reference value, it is judged as a defective product because it cannot exhibit a sufficient magnetic force even when it becomes a product.

A magnetic force inspection device that automates such an inspection process is shown in FIGS. 1 and 2. In the plan view of FIG. 1, a support table 10 that constitutes the upper surface of the support base 5.
A guide groove 11 for advancing the unmagnetized magnet material 1 supplied from the parts feeder in an aligned state is formed in the. The end point of the guide groove 11 is the magnetizing position 4, and the magnetizing magnet 6 shown in FIG. 3 is provided below this. At this magnetizing position 4, the magnet material 1 is tentatively magnetized for inspection by being kept stationary for a certain short time (for example, about 1 second). The transfer feeder 13 corresponding to the magnetizing position 4
Is provided, which is a pusher 14 and its pusher 14.
Includes a cylinder 15 for advancing and retreating with a predetermined stroke, and plays a role of sending out the magnet material 1 after magnetization to the magnetic force inspection position 9 along the guide groove 16.

Below the magnetic force inspection position 9, the electronic scale 7 and the inspection magnetic body 8 shown in FIG. 3 are provided, where the magnetic attraction force acting on the inspection magnetic body 8 from the magnet material 1. Thus, the quality of the magnet material 1 is determined by how light the measured value of the electronic scale 7 is. The transfer feeder 17 is provided behind the magnetic force inspection position 9, and the pusher 18 of the transfer feeder 17 is pushed out by the cylinder 19,
The magnet material 1 after the inspection is sent to the sorting position 21 along the guide groove 20.

A sorting unloader 22 is provided corresponding to the sorting position 21. The sorting unloader 22 includes a bidirectional pusher 23, which is moved by a cylinder 24 with a constant stroke. The magnetic material 1 determined to be non-defective at the magnetic force inspection position 9 is the transfer feeder 1
7, when the cylinder 24 is in a contracted state, the bidirectional pusher 23 is positioned at the position A, and the magnetic material 1 of good quality comes to the sorting position 21. Extrude along 25. On the other hand, when the defective magnet material 1 is fed at the magnetic force inspection position 9, the bidirectional pusher 23 with the cylinder 24 extended.
Waits at position B, the magnet material 1 reaches the sorting position 21, and then the cylinder 24 contracts, so that the bidirectional pusher 23 guides the magnet material 1 to the side opposite to the non-defective one.
It is designed to be discharged along with.

A control box 30 for controlling the inspection process as described above is provided on the support table 10. The electronic scale 7 in FIG. 3 and the cylinder 1 in FIG.
5, 19 and 24 are connected to the control box 30, and each of these cylinders is operated at a predetermined timing. Further, the control box 30 is also equipped with a means for judging the quality of the magnet material 1 according to the measurement value of the electronic scale 7. The control box 30 can also be provided with a display device for displaying the inspection result, if necessary.

In this way, the quality of the magnet material 1 is judged,
After defective products are eliminated, good products can be demagnetized in a later process in order to eliminate the temporarily magnetized state for inspection. To be able to.

In the above embodiment, the magnetizing step for inspection is also performed by one magnetic force inspection device.
If this magnetization is performed in advance by another device, the embodiment can be configured as a device for performing only the magnetic force inspection.
On the contrary, configure the magnetic force inspection device as one device to perform each process of magnetization and magnetic force inspection and demagnetization for inspection, in other words, demagnetize the magnet material that has been inspected to the device. You can also add the function to do. Of course, the present invention can be applied to magnet materials other than Alnico magnets.

【The invention's effect】

According to the present invention, the magnet material pre-magnetized for the inspection is brought close to the inspection magnetic body at the magnetic force inspection position, and the magnitude of the magnetic attraction force exerted on the inspection magnetic body by the magnet material is determined. Since the quality of the magnet material is inspected by the measurement, it is possible to easily determine the quality of the magnet material as compared with the case of using the conventional inspection coil jig.

Further, since the magnetic material is subjected to the magnetic force inspection in a pre-magnetized state for the purpose of inspection, the magnetic material is inspected in a state close to that of the actual product, and the reliability of the quality judgment is enhanced. Further, in the aspect in which the magnetizing device for inspection is provided on the upstream side of the magnetic force measurement position, the process from magnetizing to magnetic force inspection can be efficiently performed as a part.

[Brief description of drawings]

FIG. 1 is a plan view of a magnetic force inspection device according to an embodiment of the present invention.

FIG. 2 is a side view thereof.

FIG. 3 is a principle diagram of the magnetic force inspection device.

FIG. 4 is a plan view showing an example of a magnet material.

FIG. 5 is a sectional view thereof.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 magnet material 5 support stand 6 magnetizing magnet 7 electronic balance 8 magnetic material for inspection 10 support table 13, 17 transfer feeder 22 sorting unloader

Claims (2)

[Claims] 1. A material supporting portion for supporting a magnet material magnetized in advance for inspection at a magnetic force inspection position, and a magnetized member provided corresponding to the magnetic force inspection position and supplied to the magnetic force inspection position. Magnetic substance for inspection arranged at a position where the magnetic attraction force of the magnet material reaches, and a magnetic attraction force exerted on the magnetic substance for inspection by the magnet material when the magnet material is positioned at the magnetic force inspection position. A magnetic force inspection device for a magnetic material, comprising: a measuring unit for measuring the size. 2. The magnetic force inspection device includes a magnetizing device for magnetizing a magnet material for inspection on the upstream side of the magnetic force inspection position, and the magnet material magnetized at the magnetized position is sequentially described above. The device according to claim 1, further comprising a supply device for supplying the magnetic force to the inspection position.