JPH0777063B2 - Spring arm forming method - Google Patents

Description

DETAILED DESCRIPTION [Overview] A method of forming a spring arm for forming a predetermined spring pressure on a spring arm of a magnetic head, wherein one end is a free end for the purpose of improving productivity by easy and precise processing. A method of forming a spring arm, wherein a predetermined region of the spring arm is subjected to a bending process to give a predetermined displacement to the free end, the process of fixing the other end of the spring arm, and the freeing of the spring arm. A converged laser light pulse having a predetermined energy density capable of scanning the surface on the side of the end displacement in the width direction of the spring arm is moved in the length direction of the spring arm for a number of times corresponding to the required transition within a predetermined region of the spring arm. And a step of irradiating while sequentially shifting to.

[Industrial application field]

The present invention relates to a method of bending a spring arm in a magnetic head or the like, and more particularly to a method of forming a spring arm that is easily and precisely bent using a laser beam to improve productivity.

[Conventional technology]

3A and 3B are views showing a method of processing a spring arm in a conventional magnetic head or the like, FIG. 3A is a perspective view showing a bending method, and FIG. 3B is a view schematically showing a spring pressure adjusting method.

FIG. (A) shows a method for bending the spring arm to the vicinity of a required value. The spring arm 1a, which is a substantially flat isosceles triangular flat spring of the magnetic head arm portion 1, is mounted on the rubber sheet 2. The spring arm 1a is moved to the direction B while pressing the roller 3 from the upper part in the direction A as shown by the arrow, and the spring arm 1a is circled as shown in the side view.
The bending state is shown.

In this state, the variation in the amount of displacement of the magnetic head 1b located at the tip of the spring arm 1a with respect to the initial position is large.

Further, FIG. 6B shows a step of finely adjusting the displacement amount of the magnetic head 1b portion in FIG.

In the figure, 1 is a magnetic head arm part in which the spring arm 1a is R-bent to the vicinity of a required value in FIG. 1A, 5 is a load cell set at a predetermined position, and 6 is a signal from the load cell 5. It is an operating spring pressure indicator.

Here, when the magnetic head arm 1 is installed at a predetermined position, the magnetic head 1b of the spring arm 1a presses the contact 5a of the load cell 5 and the contact pressure at that time is displayed by the spring pressure indicator 6. .

Therefore, when the display spring pressure of the spring pressure indicator 6 does not reach the specified value, pressure is applied from the direction C in the figure to give a mechanical deformation, while when the display spring pressure of the spring pressure indicator 6 exceeds the specified value. In order to adjust the spring pressure by applying a mechanical deformation by applying pressure from the direction D in the figure, a severe contact pressure allowable range like that of a magnetic head is satisfied.

[Problems to be Solved by the Invention]

The conventional method of forming the spring arm requires fine adjustment of the spring pressure by a skilled person and has a problem that it takes man-hours, and the formed part that has been adjusted during the assembly work or the use after the forming process has a problem. However, there is a problem that the spring is deformed and stable spring pressure characteristics cannot be obtained for a long period of time.

[Means for Solving the Problems]

The above-mentioned problem is a method of forming a spring arm in which a predetermined region of the spring arm having one end as a free end is subjected to bending and forming to give a predetermined displacement to the free end, and the other end of the spring arm is fixed. And a step of applying a converged laser light pulse having a predetermined energy density capable of scanning the surface of the spring arm on the free end displacement side in the width direction of the spring arm to correspond to the required transition within the predetermined region of the spring arm. Forming method of spring arm configured by including irradiation while sequentially shifting the length of the spring arm by the number of times. [Operation] Generally, in the case of forming by elastic deformation, it is difficult to obtain accurate dimensions. At the same time, the dimensions tend to change over time due to springback or the like.

In view of this, in the present invention, a bending process is performed by scanning the vicinity of a predetermined position of the plate-shaped spring material with laser light to cause plastic deformation due to instantaneous heating and cooling in the scanned portion.

In this case, the amount of plastic deformation generated by one scan, that is, the bending angle can be changed by the energy density of the laser beam, and the entire bending angle when scanning a plurality of parallel parallel scans is proportional to the number of scans. Therefore, by setting the scanning position and the number of scans of the laser light whose energy can be controlled in advance, the bending angle and thus the spring pressure can be accurately matched to the required value.

Therefore, the step of finely adjusting the spring pressure is unnecessary, and stable and accurate bending / forming work can be performed in a short time over a long period of time.

〔Example〕

FIG. 1 is a diagram for explaining a method for R-bending with laser light, and FIG. 2 is a schematic diagram showing an embodiment of a method for forming a spring arm of a magnetic head.

In Fig. 1 (1), 10 is a metal plate with a thickness of about 0.5 mm,
A state in which a laser beam 11 is scanned in a direction crossing the width of the metal 10 is shown.

For example, when the laser beam 11 is moved 40 times / sec as a pulse at a speed of 20 mm / sec in the direction A, the pitch between the irradiation spots becomes 0.5 mm.

In this case, the metal plate 10 is first bent on the back surface 10b side because the scanning line of the laser beam 11 on the front surface 10a is abruptly heated and thermally expanded, but immediately after that, the temperature decreases and the contraction occurs. As a result, as shown in FIG. 2B, the surface 10a is bent at an angle α.

Figure (2) shows the scanning line of Figure (1) by s (for example, about 0.1 mm)
FIG. 3 is a diagram in which a laser beam 11 is scanned while being shifted by a certain amount. In this case, since the angle α is further bent as shown in FIG. 3C, the total bending is 2α.

FIG. 3C is a diagram in which the scanning line is further shifted by s from FIG. 2B and the laser beam 11 is applied. In this case, the entire bending angle is 3α as shown in FIG.

The bending angle α can be changed by the energy of the laser light 11.

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

The same work is repeated thereafter to ensure the required bending angle accurately.

It has been confirmed that the same effect can be obtained in any of the moving directions of the laser light 11 in the steps after (2) in FIG.

In FIG. 2, reference numeral 1 is a magnetic head arm portion, 11 is a laser beam, 12 is an optical fiber for introducing a laser beam from a laser oscillator (not shown) into the apparatus, and 13 is a laser beam focusing for focusing and irradiating the laser beam.・ Irradiator, 14 is the laser beam converging / irradiator 13
A laser light driving unit for driving the magnetic head arm unit 1 in the up and down (Z) and left and right (X) directions, and 15 in the forward and backward (Y) direction.
The magnetic head moving part 16 for moving in the direction is a load cell having a U-shaped contactor 16a sandwiching the magnetic head 1b located at the tip of the spring arm 1a of the magnetic head arm part 1.

In terms of steps, first, the magnetic head arm portion 1 is fixed to a predetermined position of the magnetic head moving portion 15. At this time, the magnetic head 1b of the magnetic head arm portion 1 is connected to the inner surface contact portion 16b of the contact 16a of the load cell 16. Are fixed so that they do not touch.

Next, after moving the magnetic head moving portion 15 in the Y direction shown in the figure to bring the magnetic head 1b and the contact portion 16b into contact with each other, the required displacement of the magnetic head 1b, that is, the d dimension in FIG. 1 (4). Only the magnetic head moving portion 15 is moved to form a gap of dimension d between the magnetic head 1b and the contact portion 16b.

While moving the laser beam converging / irradiating unit 13 set at a predetermined position by the laser beam driving unit 14 in the X direction,
11 is emitted to scan the surface of the spring arm 1a in the X direction.

In this case, as described with reference to FIG. 1, the spring arm 1a is bent toward the irradiation side on the scanning line of the laser light 11, so that the gap d is narrowed.

Therefore, the gap d disappears and the magnetic head 1b contacts the contact portion.
Irradiation is repeated while moving the laser beam 11 in the Z direction until 16b comes into contact and a predetermined spring pressure is obtained, and the required bending dimension and spring pressure are secured.

〔The invention's effect〕

As described above, according to the present invention, it is possible to provide a method of forming a spring arm, which can easily realize a displacement capable of satisfying a severe contact pressure allowable range like a magnetic head.

[Brief description of drawings]

FIG. 1 is a diagram for explaining a method for R-bending by laser light, FIG. 2 is a schematic diagram showing an embodiment of a method for forming a spring arm, and FIG. 3 is a conventional method for processing a spring arm for a magnetic head. Fig. In the figure, 1 is a magnetic head arm portion, 1a is a spring arm, 1b is a magnetic head, 10 is a metal plate, 10a is a front surface, 10b is a back surface, 11 is a laser beam, 12 is an optical fiber, 13 is a laser beam converging / irradiating device. , 14 is a laser beam drive unit, 15 is a magnetic head moving unit, 16 is a load cell, 16a is a contactor, and 16b is a contact unit.

Claims (1)

[Claims] 1. A method for forming a spring arm, wherein a predetermined region of a spring arm having one end as a free end is bent and formed to give a predetermined displacement to the free end, and the other end of the spring arm is fixed. And a step of applying a converged laser light pulse having a predetermined energy density capable of scanning the surface of the spring arm on the free end displacement side in the width direction of the spring arm to correspond to the required transition within the predetermined region of the spring arm. And a step of irradiating the spring arm while sequentially shifting the length of the spring arm by a number of times.