JPS63114203A - Manufacture of laminated magnetic core - Google Patents

Abstract

PURPOSE:To make machining easy, and improve the degree of precision, by performing previously embossing on a part necessary for machining, welding this part by a thermal means such a laser welding after laminating, and performing machining of the welded part. CONSTITUTION:When holes 5A-5F and adsorption surfaces 6A and 6B are formed by a machining after laminating magnetic plates, the following processes are employed. In the case of making holes such as holes 5A-5F parallel to the lamination surface of magnetic plates, embossing is previously given on a part for making holes, and this lamination part is welded by a thermal means such as laser welding. After that, this welded part is subjected to a process for making holes. In the case of finishing the absorption surfaces 6A and 6B, too, after the magnetic plates are laminated, this part is welded by a thermal means such as laser welding, and then a working for mirror surface is performed on the welded part. Thereby, easy machining with a high degree of precision is enabled.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a method for manufacturing a laminated magnetic core for electromagnetic devices such as motors and solenoids.

(Prior Art) As a magnetic core of an electromagnetic device such as a motor or a solenoid, a structure in which magnetic plates (usually magnetic thin plates) are laminated is used to suppress iron loss.

As a laminating method in this case, a method of providing an insulating layer between the magnetic plates and fixing them with an adhesive is widely adopted.

Although such a laminated magnetic core can suppress iron loss and has excellent electromagnetic properties, there are various difficulties when machining it.

That is, the adhesive strength of the adhesive is often insufficient to withstand machining, making it impossible to ensure dimensional precision during processing, and furthermore, there are problems in that deformation occurs due to lamination peeling, making the product unusable.

Therefore, for the magnetic core of electromagnetic devices that require machining,
Many are used, either by cutting out a block of magnetic material or by molding powder metallurgy.

However, these cores have lower magnetic properties than the laminated cores described above. In other words, when machining from a block, the iron loss is large and the frequency ↑ is reduced.
Powder metallurgy molded products have a problem in that when the filling rate is low, the saturation magnetic flux density becomes low and the energy decreases.

〔the purpose〕

An object of the present invention is to provide a method for manufacturing an alN magnetic core for an electromagnetic device that can solve the problems of the prior art and can be easily machined with high precision.

(Means for achieving the object) The present invention provides a method for manufacturing a laminated magnetic core for an electromagnet device in which magnetic plates are laminated and then machined. The above object is achieved by a manufacturing method in which the parts are welded by means and the welded parts are machined.

〔Example〕

The method of the present invention will be specifically explained below with reference to the drawings.

FIG. 1 is an exploded perspective view of a yoke of an electromagnet to which the method of the present invention is applied.

In FIG. 1, the illustrated yoke has a structure in which a pobbin 3 is attached to an upper yoke 1 and fixed to a lower yoke 2.

The yoke upper part l and the yoke lower part are composed of a laminate of magnetic plates (magnetic thin plates), and these are formed by fixing holes 5A.
It is fixed by passing bolts through -5C-5E and 5B-5D-5F and tightening them.

Furthermore, holes 4A and 4B are formed in the lower yoke 2 to attach the yoke itself.

A coil (not shown) is wound around the outer periphery 3A of the body of the bobbin 3, and is configured to magnetically attract or release an armature (not shown) by passing or cutting off current to the coil. .

Further, the end surface 6A of the upper yoke 1 and the end surface 6B of the lower yoke each form an attraction surface that magnetically attracts an armature (not shown). These attraction surfaces 6A and 6B are generally finished by laminating magnetic plates to form the yoke upper part 1 and lower part 2, and then machining (mirror finishing).

The mounting holes 4A and 4B can be accurately positioned and dimensioned by drilling holes in each magnetic plate in advance and stacking them. The above-mentioned holes 5A, 5C, 5E, 5B, 5D
, 5F is generally machined after laminating magnetic plates from the viewpoint of man-hours and processing accuracy.

However, in the method for manufacturing the laminated magnetic core (yoke) shown in FIG. 1, the holes 5A, 5C, 5E, and 5B.

When forming 5D, 5F and the attraction surfaces 6A, 6B by machining after laminating the magnetic plates, the following method is adopted.

First, parallel to the laminated surface of the magnetic plate like holes 5A to 5F (
When machining (perpendicular to the stacking direction) perforations, emboss the perforations in advance (usually before lamination) on the part to be machined, and place them on this laminated part (machining position).
A manufacturing method is adopted in which the welded parts are welded by thermal means such as laser welding, and then the welded parts are processed (machined).

Also, when finishing the suction surfaces 6A and 6B,
A manufacturing method is adopted in which after the magnetic plates are laminated, this part (processing position) is welded by thermal means such as laser welding, and then this welded part is mirror-finished (machined).

According to the method for manufacturing a laminated magnetic core (yoke) described above with reference to FIG.
Since the machining of B is carried out after the magnetic plates are welded together in the machined part to make them strong enough to withstand machining, it is possible to carry out the machining easily and with high precision.

Furthermore, since machining is performed after lamination, the advantage in terms of man-hours is maintained.

Furthermore, in processing the holes 5A to 5F, since the processed portions were embossed in advance, welding of the magnetic plates could be easily performed.

Note that iron loss occurs in the welded portion, but in reality,
Most of these parts are often removed by machining, and even if they are not removed, they are only a small part of the entire electromagnet yoke, so this is not a problem.

FIG. 2 is an exploded perspective view of a yoke for a motor using the method of the present invention.

Note that this motor yoke is a part of the electromagnet device in which frequency characteristics and iron loss are extremely important.

The yoke shown in FIG. 2 is manufactured by applying the technique of the embodiment shown in FIG. 1, and shows a case in which the magnetic poles of a four-pole motor are constructed by combining two sets of yokes.

In this embodiment as well, the number of man-hours is reduced by performing machining such as drilling and shaping after laminating the magnetic plates.

That is, each yoke is made of a laminate of magnetic plates like 7A, 7B, 8A, and 8B in FIG.
, holes 11A and 12 for joining 7B and 8B, respectively.
Drill holes A, 11B, and 12B.

In this case, the portions where these holes 11A to 12B are to be formed are welded in advance by laser welding or the like, and then punched (perforated).

Further, 9A, 9B, and IOA%IOB in FIG. 2 are portions that become magnetic poles, and are processed into an arc shape so that the rotor rotates. When processing the shapes of the portions 9A to 10B that will become magnetic poles, as in the case of drilling the holes described above, these processed portions are welded by thermal means such as laser welding after lamination, and then machined into a predetermined shape. Ru.

Note that a bobbin (not shown) is fitted and attached to each of the yoke parts 8A and 8B, and these yoke parts are connected to the yoke part 7A.
, 7B, holes 11A, 12A, 11B, 12B, respectively.
The magnetic poles of the motor are configured by fixing the wires with bolts or the like.

In the yoke shown in FIG. 2 as well, the portion to be welded after lamination can be embossed in advance (usually before lamination) to facilitate the welding.

The second embodiment of the method of the present invention described above with reference to FIG. 2 also makes it possible to achieve the same effects as in the embodiment of FIG.

As mentioned above, in the conventional method for manufacturing a laminated magnetic core, machining after lamination is a factor, and in order to form a laminated magnetic core with a complicated shape, it is usual to make each magnetic plate have a different shape. The actual situation is that if a shape is to be obtained by press molding, for example, the number of molds will increase and the manufacturing cost will become excessive.

In addition, in the conventional method of manufacturing a laminated magnetic core, it is very difficult to perform aperture processing in a direction perpendicular to the lamination direction (parallel to the lamination plane).

Therefore, the present invention was completed in order to solve these difficulties.The lamination is made in a rough shape, and when machining is performed to finish the final shape, some processing positions are heated by laser welding etc. Finishing (machining) became practical for the first time by welding the magnetic plates together using technical means to ensure strength.

Further, although iron loss occurs in the welded portion, most of this welded portion can be removed by machining, so no practical problems occurred.

〔effect〕

As is clear from the above description, according to the present invention, parts that require machining are embossed in advance, and after lamination, these parts are welded by thermal means such as laser welding. There is provided a method for manufacturing a laminated magnetic core for an electromagnetic device, which allows machining to be performed easily and with high precision.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view illustrating a yoke for an electromagnet using the method for manufacturing a laminated magnetic core according to the present invention, and FIG. 2 is an exploded perspective view of a yoke for a motor using the method for manufacturing a laminated magnetic core according to the present invention. 12.7A, 7B, 8A, 8B---Magnetic core (yoke), 5.6.11.12---Machining part.

Claims (1)

[Claims] (1) In a method for manufacturing a laminated magnetic core for an electromagnet device in which magnetic plates are laminated and then machined, the part to be machined is embossed in advance, and after lamination, this part is welded by thermal means. A method for manufacturing a laminated magnetic core, characterized by machining a portion of the laminated magnetic core.