JPH01227279A - Magnetic head forming processing method - Google Patents

Abstract

PURPOSE:To obtain a stable spring pressure characteristic by radiating a laser beam pulse converged in the neighborhood of a prescribed bending position on the surface of the spring arm of a magnetic head by plural adjacent scanning line. CONSTITUTION:A magnetic head moving part 15 is fixed in a prescribed position so that a tip part 1b of a magnetic head arm part 1 may not touch an inner surface contact part 16b of a contact shoe 16a of a load cell 16. The moving part 15 is moved in a Y direction, the tip part 1b is brought into contact with a contact part 16b, the moving part 15 is moved by the necessary deformation quantity of the tip part 1b and a clearance is formed. As moving a laser beam converging/radiating part 13 in an X direction by a laser beam driving part 14, a laser beam 11 is emitted and the surface of a spring arm 1a is scanned. Since the arm 1a is bent to an irradiation side on the scanning line of the beam 11, the above-mentioned clearance is narrowed. The irradiation is repeated as moving the beam 11 in a Z direction until the clearance is lost, the tip part 1b touches the contact part 16b and the prescribed spring pressure is obtained, and the desired bending dimension and spring pressure are obtained. Thus, the magnetic head of stable characteristic can be easily supplied for a long period.

Description

[Detailed Description of the Invention] [Summary] Regarding a magnetic head molding method for forming a predetermined spring pressure on the spring arm of a magnetic head, the present invention aims to improve productivity through easy and precise machining. A magnetic head forming method in which bending is performed at a predetermined position to form a predetermined spring pressure at the tip of the spring arm, and the method includes applying focused laser light pulses to the vicinity of a predetermined bending position on the surface of the spring arm of the magnetic head. It is constructed by irradiating with a plurality of scanning lines that are close to each other.

[Industrial application field]

The present invention relates to a method for bending a spring arm of a magnetic head, and more particularly to a method for molding a magnetic head that uses laser light to easily and precisely form the required surface to improve productivity.

[Conventional technology]

FIG. 3 is a diagram showing a conventional method for processing a spring arm of a magnetic head, and (A) is a perspective view showing a bending method;
(B) is an abbreviated diagram of the spring pressure adjustment method.

Figure (A) shows a method for bending the spring arm to near the required value, in which the spring arm 1a, which is an approximately isosceles triangular flat thin plate spring of the magnetic head 7-arm portion 1, is bent by a rubber sheet. The spring arm 1a is placed on top and moved in the direction of arrow B while pressing the roller 3 from above in the direction of arrow A, thereby bending the spring arm 1a in an R direction as shown in the side view.

In this state, there is a large variation in the amount of displacement of the tip portion 1b of the spring arm 1a with respect to the initial value.

Further, Figure (B) is a step of finely adjusting the amount of displacement of the tip portion 1b in Figure (8).

In the figure, ■ is a magnetic held arm part in which the spring arm 1a in Figure (8) is bent to the vicinity of the required value, 5 is a load cell set at a predetermined position, and 6 is a signal from the load cell 5. This is a working spring pressure indicator.

When the magnetic hand arm 1 is installed at a predetermined position, the tip 1b of the spring arm 1a presses the contact 5a of the load cell 5, and the contact pressure at that time is displayed on the spring pressure indicator 6.
is configured to display.

Therefore, when the displayed spring pressure of the spring pressure indicator 6 is less than the specified value, pressure is applied from the direction C shown in the figure to give mechanical deformation, while on the other hand, when the displayed spring pressure of the spring pressure indicator 6 exceeds the specified value The spring pressure is adjusted by applying pressure from the direction shown in the figure to mechanically deform it.

[Problem to be solved by the invention]

Conventional magnetic head molding methods require fine adjustment of the spring pressure by a skilled person and require a lot of man-hours.Also, the adjusted molded parts may be damaged during assembly or use after molding. There was a problem that the spring pressure characteristics were not stable over a long period of time due to deformation.

[Means to solve the problem]

The above-mentioned problem lies in a magnetic head forming method in which a spring arm of a magnetic head is bent at a predetermined position to form a predetermined spring pressure at the tip of the spring arm. This problem can be solved by a magnetic head molding method in which a plurality of scanning lines close to each other are irradiated with converged laser light pulses in the vicinity of the position.

[For production]

Generally, in the case of molding using elastic deformation, it is difficult to obtain accurate dimensions, and the dimensions tend to change over time due to springback or the like.

Therefore, in the present invention, a laser beam is scanned near a predetermined position of the plate-shaped spring material to instantaneously heat the scanned part.

Bending processing is performed by causing plastic deformation by cooling.

In this case, the amount of plastic deformation, that is, the bending angle generated by -times of scanning can be changed by the energy density of the laser beam, and the total bending angle when scanning is performed in parallel multiple times in close proximity is proportional to the number of scans. Therefore, by setting in advance the scanning position and the number of scans of the laser beam whose energy can be controlled, the bending angle and thus the spring pressure can be made to accurately match the required value.

Therefore, there is no need for a step of finely adjusting the spring pressure, and stable and accurate bending work can be performed in a short time over a long period of time.

〔Example〕

FIG. 1 is a diagram illustrating an R-bending method using a laser beam, and FIG. 2 is a schematic diagram showing an embodiment of a magnetic head molding method.

In FIG. 1 (1), 10 is a metal plate with a thickness of about 0.5 mm, and a laser beam 1 is directed across the width of the metal FILO.
1 is scanned.

For example, if the laser beam 11 is pulsed 40 times/sec and moved in the A direction at a speed of 20 mm/sec, the pitch between each irradiation spot will be 0.5 m+m.

In this case, the metal plate 10 is first rapidly heated on the scanning line of the laser beam 11 on the front surface 10a and thermally expands, so that it momentarily bends toward the back surface 10b, but immediately after that, the temperature decreases and the metal plate 10 contracts. , as a result, the surface 1 as shown in Figure (2)
It will bend at an angle α toward 0a side.

Figure (2) shows the scanning line in Figure (1) S (for example, 0.1 mm
FIG.

In this case, the angle α is further bent as shown in FIG. 3, so the total bend is 2α.

Figure (3) is a diagram in which the scanning line is further shifted by S from Figure (2) and the laser beam 11 is irradiated, and in this case, Figure (4)
The overall bending angle is 3α.

Note that the above-mentioned bending angle α can be changed depending on the energy of the laser beam 11.

In this case, the amount of deformation formed by the bending angle 3α is shown as six dimensions in FIG. 4 (4).

The same process is then repeated to ensure the required bending angle.

It has been confirmed that the same effect can be obtained whether the direction of movement of the laser beam 11 in the steps from FIG. 2 is in either direction A or B.

In Fig. 2, 1 is a magnetic herad arm, 11 is a laser beam,
12 is an optical fiber that introduces laser light from a laser oscillator (not shown) into the device; 13 is a laser beam convergence/irradiation section that converges and irradiates the laser beam.

14 is a laser beam drive unit that drives the laser beam convergence/irradiation unit 13 in the vertical (Z) and left/right (X) directions; 15 is a laser beam drive unit for moving the RAD arm unit 1 in the defined magnetic direction in the front and rear (Y) directions; The magnetic head moving section 16 is a load cell equipped with a U-shaped contact 16a that sandwiches the tip end 1b of the spring arm 1a of the magnetic herad arm section 1.

In terms of process, first the magnetic head arm section 1 is fixed at a predetermined position of the magnetic head moving section 15, but at this time, the tip end 1b of the magnetic head arm section 1 is connected to the contact 16 of the load cell 16.
It is fixed so as not to contact the inner surface contact portion 16b of a.

Next, the magnetic head moving unit 15 is moved in the Y direction shown in the figure to bring the tip portion 1b into contact with the contact portion 16b, and then the tip portion 1b is deformed by the required amount of deformation, that is, six dimensions in FIG. 1 (4). By moving the magnetic head moving section 15 by the amount shown in FIG.

Here, while moving the laser beam convergence/irradiation section 13 set at a predetermined position by the laser beam drive section 14 in the X direction, the laser beam 11 is emitted to scan the surface of the spring arm 1a in the X direction.

In this case, as explained in FIG. 1, the spring arm 1a is bent toward the irradiation side on the scanning line of the laser beam 11, so that the gap d is narrowed.

Then, the gap d disappears and the tip portion 1b and the contact portion 1
The laser beam 11 is moved in the X direction and the irradiation is repeated until the two contacts 6b come into contact and a predetermined spring pressure is obtained, thereby ensuring the required bending dimension and spring pressure.

〔Effect of the invention〕

As described above, the present invention provides a magnetic head molding method that can easily supply magnetic heads with stable characteristics over a long period of time without performing fine adjustment of spring pressure in the final process of assembling the magnetic head. can do.

[Brief explanation of the drawing]

Fig. 1 is a diagram illustrating an R-bending method using a laser beam, Fig. 2 is a schematic diagram showing an embodiment of a magnetic head molding method, and Fig. 3 is a diagram illustrating a conventional magnetic head spring arm processing method. , is. In the figure, 1 is the magnetic helad arm, la is the spring arm, 1b is the tip, lO is the metal plate, 10a is the front surface, 10b is the back surface,
7 = ± = company spirit; 11 is a laser beam, 12 is an optical fiber, 13 is a laser beam convergence/irradiation section, 14 is a laser beam drive section, 15 is a magnetic head moving section, 16 is a load cell, 16a is a contact, 16b represents a contact portion, respectively. , Ascend 1 Mouth (A') 6 Ra Ni Guishi no Rehe - Totasburin 2z Oriage: Method Three Kushisu 2 Many 32

Claims (1)

[Scope of Claims] A method for forming a magnetic head by bending a spring arm of a magnetic head at a predetermined position to form a predetermined spring pressure at the tip of the spring arm, the method comprising: A magnetic head molding method characterized in that a plurality of scan lines close to each other are irradiated with converged laser light pulses near a bending position.