JPS6342008A - Production of laminate core for magnetic head - Google Patents

Abstract

PURPOSE:To facilitate the working and improve the yield by laminating plural magnetic material sheets on which unit core members are formed and cutting unit core members and welding laminated unit core members into one body. CONSTITUTION:I-shaped unit core members 2.2... are formed on 'Permalloy(R)' sheet 1 by press work, and plural 'Permalloy(R)' sheets 1.1... on which plural unit core members 2.2... are laminated. Unit core members 2.2... are cut from connection parts 3 in this state where 'Permalloy(R)' sheets 1.1... are laminated. In case of this cutting work, a laser welding machine is used to weld centers of both edges of unit core members 2.2... into one body simultaneously with the cutting work. A laminate core 5 where welds 4 and 4 are formed in centers of both edges is obtained by this cutting and welding work. Thus, the manhour for working is considerably reduced to facilitate the working, and then rate of occurrence of defects is reduced.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a new method for manufacturing a laminate core that serves as the center core of a magnetic head, and in particular a manufacturing method that can reduce the number of processing steps and improve yield. Regarding the method.

[Conventional technology]

Conventionally, in order to manufacture the above-mentioned laminate core,
A method has been adopted in which unit core members are punched out of a magnetic material sheet such as Vermaro or A, which is a raw material, and a plurality of the punched unit core members are laminated and welded.

[Problem that the invention seeks to solve]

However, according to this conventional method of manufacturing a laminate core, since unit core members that have been punched and formed in advance are laminated, a large number of man-hours are required for processing, and the work is troublesome, and the yield is low. was also low.

Therefore, the present invention has been made by focusing on the problems of the related art, and it simplifies the processing work, reduces the number of steps, shortens manufacturing time, improves yield, and ultimately improves the quality of the product. It is an object of the present invention to provide a method for manufacturing a laminate core for a magnetic head, which can reduce the cost.

[Means for solving the problem] In order to achieve this object, the method for manufacturing a laminate core for a magnetic head according to the present invention includes forming a unit core member on a sheet of magnetic material, and forming the unit core member in a magnetic material sheet. The method is characterized in that a plurality of formed magnetic material sheets are laminated, then the unit core members are cut from the magnetic material sheets, and at the same time, the laminated unit core members are welded and integrated.

[Effect]

By using the above-mentioned manufacturing method, it is possible to save the labor of laminating separate unit core members one by one, and also to improve the yield, resulting in lower product prices. .

〔Example〕

Next, an example of the implementation of the present invention will be described in detail with reference to FIGS. 1 to 4.

In the figure, 1 is a sheet made of permalloy, which is a magnetic material.
For this permalloy sheet 1, 1
A unit core member 2Φ2... having a letter shape is formed. At this stage, the unit core members 2, 2... are connected to each other and to the permalloy sheet 1 by the connecting portion 3, and the unit core members 2, 2... are connected to each other and to the permalloy sheet 1 at this stage. It is assumed that, for example, 36 pieces (6×6) are formed on one permalloy sheet l.

Next, a plurality of unit core members 2112 (
A plurality of permalloy sheets l-1... (36 sheets) were stacked as shown in FIG. This lamination work is carried out by placing the permalloid seaweed 1 into a curing A or the like. In this way, with the permalloy seaweed 1... stacked, the unit core members 2 and 2 stacked from the connecting portion 3 are stacked.
2... is cut. A laser welding machine (not shown) is used for this cutting operation, and at the same time as this cutting operation, the centers of both end edges of the stacked unit core members 2 are welded and integrated. Through this cutting and welding operation, it is possible to obtain a laminate core 5 in which welded parts 4, 4 are formed at the center of both ends as shown in FIG.

As shown in FIG. 4, the laminated core 5 thus obtained is fitted with C-shaped cores 6 and 6 via coil bobbins on the left and right sides.
The sliding contact surface with the media such as magnetic tape is polished along the polished surface 7 shown as an arch line in the figure, and the welded part 4 on the sliding contact surface side with the media is removed by this polishing, and the undulations are removed. This is intended to prevent current loss from occurring.

In this embodiment, a plurality of (36) unit core members 2 orders 2... are formed on one permalloy sheet (magnetic material sheet) 1, but the invention is not limited to this.
It does not matter if there are 36 or more pieces, and the processing means is not limited to press or laser, but it is of course possible to use other equivalent means.

〔Effect of the invention〕

As described above, according to the method for manufacturing a laminated core for a magnetic head according to the present invention, the magnetic material sheets forming unit core members are laminated and cutting and welding operations are performed, so the number of processing steps is significantly reduced. This makes it easier to manufacture products, reduces the incidence of defective products, and improves yields, making it possible to lower product prices.

[Brief explanation of the drawing]

The drawings show an example of the implementation of the present invention, and FIG. 1 is a perspective view of a state in which a plurality of unit core members are formed on a permalloy sheet, and FIG. 2 is a perspective view of a state in which a plurality of the same permalloy sheets are laminated. , FIG. 3 is a perspective view of the laminated core obtained by cutting and welding, and FIG. 4 is a front view of the obtained laminated core with a C-shaped core attached and showing the polished state of the sliding surface. l...permalloy sheet? ...Unit core member 3.
... Connecting part 4... Welding part 5... Laminate core No. 1 Fig. 2F21

Claims (2)

[Claims] (1) Forming a unit core member on a magnetic material sheet, laminating a plurality of magnetic material sheets forming the unit core member,
A method for manufacturing a laminated core for a magnetic head, comprising: cutting the unit core members from the magnetic material sheet, and simultaneously welding and integrating the laminated unit core members. (2) The magnetic material sheet is made of permalloy, a plurality of unit cores and members are formed on the single permalloy sheet by press working, and a laser is used for cutting and welding. 2. A method for manufacturing a laminate core for a magnetic head according to item 1.