JPS61194613A - Manufacture of magnetic head - Google Patents

Abstract

PURPOSE:To joint two core bodies in the excellent state without braking them by sealing hermetically two core bodies made of 'Sendust(R)' alloy in a container made of soft materials in the state where silver brazing filler metal is held between them, placing the container in a high temperature and high pressure furnace and jointing two core bodies. CONSTITUTION:A coil groove 3 and a coil window 4 are notched and formed on one core body 1, and an SiO2 film 5 is formed on some part of the body 1. On the other core body 3 the coil groove 3 is formed. Joint surfaces 6 and 7 face each other, and the silver brazing filler metal 8 is provided in a groove 9 between them, and all of them are hermetically sealed in the container 10 made of soft materials. The container 1 is placed in a high temperature and high pressure furnace to joint the bodies. For instance, the core bodies 1 and 2 are put into the soft container 10, sealed hermetically in the vacuum state, placed on a specimen stand 12 as they are. Then a compressor 15 and a heater 14 are driven to hold a hermetically sealed space A at 1kg/cm<2> and about 780 deg.C, which is maintained about 10min.

Description

DETAILED DESCRIPTION OF THE INVENTION -1 The present invention relates to a method of manufacturing a magnetic head made of Sendust alloy, which is mainly used for recording and reproducing metal tapes.

Traditionally, Sendust alloy has excellent properties such as extremely high initial magnetic permeability, high saturation magnetic flux density, and low coercive force, so it has been used for recording and reproducing high-density metal tapes. There is.

Incidentally, a method for manufacturing a magnetic head is carried out by joining two core bodies, but when the core body is made of Sendust alloy, it is necessary to use silver solder, which is relatively compatible with Sendust alloy, as the adhesive. Then, with the jig, 2
The two core bodies are pressed together and heated to the melting temperature of the silver solder to join them.

Here, if a tightening fixture such as a screw is used as the jig,
When the temperature rises to the melting temperature of the silver solder, the difference in the amount of expansion between the core body and the jig causes an excessive force to be applied to the core body, which may break the core body. For this reason, spring materials that can absorb the difference in expansion when the temperature rises are currently used as jigs.

However, when a spring material is used as a jig, there is a problem that the spring material loses its elasticity at the melting temperature of the silver solder (780° C. or higher), and therefore the core body cannot be joined. In addition, when pressing the core body with a spring material, the pressing force is concentrated locally and cannot be pressed with a uniform force over the whole body, so the gap length of the front gap, which plays the main role in tape recording and playback, becomes uneven. There is also the disadvantage that the core body may be destroyed at the portion where the pressing force is concentrated.

Therefore, in order to solve the above-mentioned problems, the present invention has developed an extremely suitable method for manufacturing a magnetic head in which the two core bodies can be joined by melting silver solder while uniformly pressing the two core bodies with an appropriate pressure. is intended to provide.

In order to achieve this object, the method for manufacturing a magnetic head according to the present invention involves sandwiching silver solder between two core bodies made of sendust alloy, and sealing the entire body in a soft container. It is characterized by joining two core bodies in a high-temperature, high-pressure furnace.

Real Iu1 FIG. 1 shows a core body 1.2 made of Sendust alloy.

A winding groove 3 and a winding window 4 are cut out in one core body 1, and 5102M5 is formed in a part of the core body 1.

This film is a non-magnetic gap spacer for forming a front gap at a predetermined distance when the two core bodies 1.2 are joined. A winding groove 3 is formed in the other core body 2 . Further, thin grooves 9 for inserting silver solder 8 are formed in opposing faces on the joining surfaces 6.7 of both core bodies 1.2.

As shown in FIG. 2, the two core bodies 1.2 are sealed in a soft container 10 with their joint surfaces 6.7 facing each other and a silver solder 8 inserted into the groove 9 between them. be done. Then, the container 10 is placed in a high-temperature, high-pressure furnace shown in FIG. 3 to perform bonding.

The high-temperature/high-pressure furnace includes an enclosure 11 consisting of an upper lid 11a, a high-pressure cylinder 11b, and a lower lid 11c, a sample 12 and a cylindrical heat insulator 13 housed in the enclosure 11, and a space A inside the heat insulator 13. It consists of a heater 14 provided for heating the sample and a compressor 15 that introduces a pressure medium such as argon gas into the space A.

Although not shown, the upper lid 11a and the lower lid lie are held from the outside by a press frame. A furnace with such a configuration is HI P (Hot l5osta
A hot isostatic pressing device can be used. If such a HIP equipment is used, it is convenient to use the soft container 10 as is, which is a mild steel can used for HIP processing.

To join the two core bodies 1.2 in the high-temperature, high-pressure furnace described above, the core bodies 1.2 are placed in a soft container 10, sealed while being evacuated, placed on the sample stage 12, and placed on the compressor 15 and IK by driving the heater 14 inside the closed space A.
g/C1% Maintain at about 780°C for about 10 minutes. If the core bodies 1.2 are placed under such conditions, the entire two core bodies 1.2 are pressed with uniform pressure through the soft container 10, and the temperature is raised to about 780°C in that state. As the silver solder melts and the two core bodies 1
．． Join 2. When the bonding is completed, the magnetic head is taken out from the furnace, the container 10 is removed, and the magnetic head base to which the two core bodies 112 are bonded is thinly sliced to a thickness of about 0.15 mm to obtain a magnetic head.

Incidentally, in the above embodiment, the core body 1 is joined by silver solder.
．． 2 is divided into 1 block, but the 4th
As shown in the figure, the winding groove 3 before division, the winding window 4
It goes without saying that the processed plate-like pieces may be joined together using silver solder, and then cut and divided into blocks after joining.

Hello! ■ [L As explained above, according to the present invention, silver solder is sandwiched between two core bodies made of sendust alloy, the whole is sealed in a soft container, and the core body is placed in a furnace and pressurized. Because of this, unlike the conventional means of pressing with a spring, there is no fluctuation in the pressing force even when the temperature is raised to the melting temperature of silver wax, and Pascal's principle applies uniform pressure to the entire two core bodies through a soft container. can be pressed. Therefore, as long as the pressure in the furnace is set to an appropriate pressure, two core bodies can be joined in good condition without destroying the core bodies.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing an example of a core body to be used in carrying out the method of the present invention, Fig. 2 is a diagram showing a lid core body sealed in a soft container, and Fig. 3 is a diagram showing an example of a core body used in carrying out the method of the present invention. FIG. 4 is a diagram showing an example of the high temperature/high pressure furnace used, and FIG. 4 is a diagram showing another example of the core body used in the embodiment of the method of the present invention. 1.2...Core body, 8...Silver solder, 10...Soft container Fig. 1 Fig. 2

Claims (1)

[Claims] With silver solder sandwiched between two core bodies made of sendust alloy, the entire body is sealed in a soft container, and the container is placed in a high-temperature, high-pressure furnace to join the two core bodies. Features: A manufacturing method for magnetic heads.