JP3074200B2 - Head assembly method for magnetic disk drive - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of assembling a head of a magnetic disk drive, and more particularly to a method of assembling a head of a magnetic disk drive by caulking a head assembly to an actuator block.

[0002]

2. Description of the Related Art FIGS. 8A and 8B show a magnetic disk drive.
The head is moved in the radial direction of the magnetic disk medium by the head actuator mechanism shown in FIG. In the figure, reference numeral 10 denotes an actuator block, which is turned around a shaft 11. Arm support 1 of actuator block 10
0a~10e respectively to the head assembly 12 ₁ to 12 ₈
Each is fixed. Head assembly 12 ₁ to 12
₈ each has a core slider 13 on which a magnetic head is formed, supported and attached to the tip of a spring arm 14 by a gimbal (not shown), and a spacer (not shown) welded to the other end of the spring arm 14. To the arm support 10
The crimp holes 15a to 10e are attached by caulking.

In the conventional caulking method, as shown in FIG. 9, the spacers 16 _{1 to} 16 ₈ of the head assemblies 12 _{1 to} 12 ₈ are respectively inserted into the caulking holes 15 of the arm support portions 10a to 10e.
Is mounted, and a jig spacer 20 having a through hole provided between each of the arm supporting portions 10a to 10e is inserted and arranged.
5 and spacers 16 _{1 to} 16 smaller in diameter than the steel balls 21.
₈ Press and expand each central hole 16a to remove the head assembly 1
2 _{1 to} 12 ₈ Each of the spacers 20 is connected to the arm supporting portion 10a.
And caulked to 10e. The above caulked punch 2
The insertion speed of No. 2 is controlled to be constant.

[0004]

Conventionally, a swaging punch 2 is used.
2 is controlled to be constant, the caulking punch 22 is displaced from the center of the caulking hole 15 and the caulking punch 22
Spacer 16 ₁ depending on the deformation of the steel ball 21 and the surface condition of the steel ball 21.
Crimping pressure to ~ 16 ₈ each have a problem that can damage the s spacer 16 ₁ to 16 ₈ husband becomes excessive.

In addition, the caulking punch 22 is inserted into the caulking hole 15.
Actuator block due to caulking stress when inserted
10 moves in the direction of arrow A to move the spacer 16_Two, 16_Four,
16 ₆, 16₈Abuts on the jig spacer 20. Jigs
Spacer 16 to be caulked in contact with pacer 20
_Two, 16_Four, 16₆, 16₈Each is a jig spacer 20
The spacer shape is not deformed because it is pressed.
However, the remaining spacer 16₁, 16_Three, 16_Five, 16₇
Since each is not held down by the jig spacer 20,
As shown in Fig. 10, the shape of the
End head assembly 12₁, 12_Three, 12_Five, 12
₇However, there is a problem that the mounting accuracy is deteriorated.

Further, in the prior art, as shown in FIG. 11, each arm supporting portion 10a to 10e of the actuator block 10 is fixed to the jig 21 in a state where it is in contact with the jig 21 and caulking is performed. height b from the supporting point of the arm support to the center hole 16a of each spacer 16 ₁ to 16 ₈
And the height a from the support point to the center of the swaging punch 22 is matched.

For this purpose, each of the arm supporting portions 10a to 10a
The accuracy of the height b at e and the accuracy of the height a at the jig 21 must be high. The height a, there is a problem that the error of b is the height of the deviation between the caulking punch 22 and the central hole 16a occurs when there is a risk of damage to the spacers 16 ₁ to 16 _8.

[0008] The present invention has been made in view of the above points,
It is an object of the present invention to provide a head assembling method for a magnetic disk drive in which the spacer is prevented from being deformed, the spacer is prevented from being deformed, and the mounting accuracy of the head assembly is improved.

[0009]

A head assembling method for a magnetic disk drive according to the present invention is mounted on an actuator block.
Jig space inserted between multiple head assemblies
Adjust the thickness of the head to make it contact each head assembly .
Press with a squeezing punch.

[0010]

Further, a head assembly is mounted on one of both sides of each of a plurality of arm support portions of the actuator block and is brought into contact with a jig spacer inserted between the plurality of head assemblies, and the other is swaged with a punch. After pressing and caulking from the side, the head assembly is mounted on the other side of each of the plurality of arm support portions and is brought into contact with a jig spacer inserted between the plurality of head assemblies, and the one side is caulked with a punch. Press more and crimp.

A jig spacer is inserted between a plurality of head assemblies mounted on the actuator block,
The plurality of arm supports are pressed from both sides and pressed to abut against the jig spacer, and pressed from one side by a swaging punch to swage.

Further, the actuator block is rotatably supported so that the positions of the plurality of arm supporting portions can be displaced, and the center hole of the spacer is positioned and caulked by the centripetal effect of the steel ball pressed by the caulking punch. .

[0014]

In the present invention, the caulking spacer must be cured.
To make contact with fixture spacers.
Shape is prevented.

[0015]

Further, since the actuator block is rotatably supported and the center hole of the spacer is positioned by the centripetal effect of the steel ball to be caulked, the height position of the caulked punch and the center hole of the spacer are shifted. The caulking is performed without any damage, and damage to the spacer can be prevented.

[0017]

FIG. 1 shows an embodiment of the technique applied to the method of the present invention.
FIG. 4 shows a block diagram of an example . In the figure, 30 is a motor,
The pushing member 31 is driven to be pushed in the direction of arrow B. A pressure detecting unit 32 is attached to the tip of the pushing member 31, and the caulking punch 22 is attached to the tip of the thrust detecting unit 32. The pressing unit 31 driven by the motor 30 pushes the pressure detecting unit 32. and crimping punch 22 is caulked is performed is pushed in the arrow a ₁ direction. The pressing force at this time is detected by the pressure detecting unit.

This pressure detection signal is supplied to a motor control circuit 33, which controls the speed of the motor 30 so that the detected pressure does not exceed a predetermined value. And is supplied to the motor 30.

The motor control circuit 33 is, as shown in FIG.
At step 35, it is determined whether the detected pressure exceeds the threshold value TH.
If it exceeds, the rotational speed of the motor 30 is determined in step 36.
The swaging pressure of the punch 22 by lowering
Lower. In step 35, the detected pressure is equal to or less than the threshold value TH.
In step 37, the motor 30 is driven at a predetermined rotational speed in step 37.
Move. This process is very small during caulking.
It is executed repeatedly on an hourly basis. As a result, FIG.
Perform caulking as shown by the solid line in (A).
The tightening pressure does not exceed the threshold, and is
No squeezing pressure is applied, as shown in FIG.
And the caulking pressure near the threshold is maintained, ₁~
16₈Is prevented from being damaged.

FIG. 4 shows a sectional view of a first embodiment of the method of the present invention. In the figure, the head assembly ₁₂ 1 to 12 ₈ each of the spacers ₁₆ 1 to 16 ₈ in each arm support 10a~10e respective caulking holes 15 fitted, the arm support 10
The jig spacer 40 is inserted and arranged between each of a to e. The jig spacer 40 is composed of a pair of wedge-shaped members having through holes, and the wedge-shaped members 40a and 40b have their inclined surfaces slidably in contact with each other. After inserting the jig spacer 40 between the arm support, the wedge-shaped members 40a, 40b respectively so the slide in the arrow _B 1, _{B 2} directions, arm support portion opposite (eg 16 ₆ and ₁₆ 7, 16 ₇ 1
6 ₈₎ is mounted on each spacer (e.g., 16 ₅ and 1
6 _6, 16 ₇ and 16 ₈₎ are brought into contact without a gap outside surface respectively.

Thereafter, the steel ball 21 is swung with an arrow A using a caulking punch.
When caulking by inserting the spacers 16 _{1 to} 16 ₈ in _one direction by pressing and expanding the respective central holes 16a, the spacers 16
_{For 1} to 16 ₈ respectively are pressed by the jig spacer 40, all of the spacer 16 ₁ to 16 ₈ no deformation of the shape, all the mounting accuracy of the head assembly 12 ₁ to 12 ₈ becomes good.

Also, using the same jig spacer 20 as in the prior art, as shown in FIG.
e, spacers 16 ₂ , 16
_4, 16 _6, 16 ₈ only by mounting inserts the steel ball 21 in the arrow A ₁ direction caulking hole 15. Thus the actuator block 10 arrow A ₁ is movement spacer 1
6 _2, 16 _4, 16 _6, 16 ₈ perform caulking after having abutted against the jig spacer 20.

[0023] After this, as shown in FIG. 5 (B), each arm supporting portions 10a~10d spacer 16 ₁ from the left in the drawing to crimping holes 16 _3, 16 _5, 16 ₇ by mounting crimping a steel ball 21 holes 15 in the arrow a ₂ (a ₁ and reverse) an actuator block 10 is inserted in the direction is moved in the arrow a ₂ direction spacers 16 _1, 16 _3, 16 _5, 16 ₇ abuts against the jig spacer 20 After caulking, perform caulking.

By dividing the swaging into two times in this manner, each of the spacers 16 _{1 to} 16 ₈ can be held down by the jig spacer 20 to prevent deformation of the shape.

In addition, as in the conventional case, the arm support portion 10a
The head assembly 12 _{1 is} inserted into each of the caulking holes 15.
12 ₈ Each of the spacers 16 ₁ to 16 ₈ is mounted, also the arm support 10a~10e respectively in a state where the jig spacer 20 having a through hole was inserted and arranged between the ends of the arm supporting portions 10a and 10e Are pressed from both sides to deform the arm supports 10a to 10e,
The punch 22 may be inserted in the direction of the arrow A after the clearance between the jig spacers 20 a and 10 e is eliminated. Again spacer _{161-164 8} respectively can prevent deformation of the shape pressed by the jig spacer 20.

FIGS. 6A to 6C respectively show the second embodiment of the method of the present invention.
2 shows a plan view, a side view, and a cross-sectional view of a second embodiment. FIG.
(A), (B) in each arm support 10a~10e head assembly ₁₂ to the caulking holes each 1-12 ₈ Each of the spacers ₁₆ 1 to 16 of the actuator block 10
_The head actuator mechanism equipped with ₈ is mounted on a jig 50 while the shaft 11 of the actuator block 10 is rotatably supported by the support portion 51. At this time the head assembly ₁₂ 1 to 12 ₈ respectively of the distal end portion is supported on a front guide 52 of the jig 50. The arm support 10e is supported by a rough dyed 53 provided on the jig 50.
The mounting position of the rough guide 53 is such that the center of the caulking hole 15 of the arm supporting portion 10e is slightly lower than the center of the caulking punch 22 when the arm supporting portion 10e abuts.

As shown in FIG. 6C, the jig spacer 20 is
Insert between the arm support parts 10a to 10e,
Caulking the punch 22 and guiding it with the punch guide 54
Mark A ₁Direction, the steel ball 21 slides as shown in FIG.
Pacer 16₈When expanding the central hole 16a of the steel ball 2
Actuator block 10 is pivoted by centripetal effect 1
11 about the actuator block 10
Is lifted in the direction of arrow C and swaged punch 22 and steel ball 2
1 center and spacer 16₈Of the center hole 16a
Therefore, high-precision caulking can be performed. In addition, 2
3 prevents the steel ball 21 from coming off the swaging punch 22
Steel ball holding rod.

This means that all the spacers 16 _{1 to} 16 ₈
The same applies to the crimping of each, whereby it is possible to perform without fear crimping damage all spacers _{161-164 8.}

[0029]

As described above, according to the head assembling method of the magnetic disk drive of the present invention, there is no possibility of damaging the spacer, the deformation of the spacer is prevented, the mounting accuracy of the head assembly is improved, and the practical use is extremely high. Useful.

[Brief description of the drawings]

FIG. 1 is a block diagram of an embodiment of a technique applied to a method of the present invention.

FIG. 2 is a flowchart of motor control.

FIG. 3 is a characteristic diagram of a caulking pressure.

FIG. 4 is a sectional view of a first embodiment of the method of the present invention.

FIG. 5 is a sectional view of a modification of the first embodiment of the method of the present invention.

FIG. 6 is a plan view, a side view, and a cross-sectional view of a second embodiment of the method of the present invention.

FIG. 7 is a diagram for explaining a second embodiment of the method of the present invention.

FIG. 8 is a plan view and a side view of a head actuator mechanism.

FIG. 9 is a cross-sectional view of each example of the conventional method.

FIG. 10 is a cross-sectional view of each example of the conventional method.

FIG. 11 is a cross-sectional view of each example of the conventional method.

[Explanation of symbols]

10 actuator block 10a~10e arm support 11 shaft 12 ₁ to 12 ₈ head assembly _{161-164 8} spacers 20, 40 jig spacer 33 motor control circuit 50 jig

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-62-298012 (JP, A) JP-A-64-30159 (JP, A) JP-A-63-220933 (JP, A) JP-A-58-1983 199699 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G11B 5/49 G11B 5/127 B21D 39/00

Claims (4)

(57) [Claims] (1)Multiple head assemblies for magnetic disk drives
A spacer with a central hole for each
Attach to the caulking holes of each of the multiple arm support parts of the lock,
Caulking by pressing the center hole of the spacer with a punch,
The plurality of head assemblies into an actuator block
In the head assembling method of the magnetic head device to be attached, A plurality of head assemblies mounted on the actuator block
The thickness of the jig spacer inserted between the
Abut the spacer on the head assembly, A magnetic disk characterized by being pressed by the caulking punch.
A method of assembling a disk device head. (2)Multiple head assemblies for magnetic disk drives
A spacer with a central hole for each
Attach to the caulking holes of each of the multiple arm support parts of the lock,
Caulking by pressing the center hole of the spacer with a punch,
The plurality of head assemblies into an actuator block
In the head assembling method of the magnetic head device to be attached, Each of the plurality of arm support portions of the actuator block
Attach the head assembly to one of the two sides
A process in which a spacer is inserted between the plurality of head assemblies
Abut the tool spacer, Pressed from the other side with the caulking punch and caulked
rear, A head assembly is attached to the other side of each of the plurality of arm supports.
A plurality of head assemblies are attached to the plurality of head assemblies.
Abut on the jig spacer inserted between the Press from one side of the caulking punch to caulk
And a head assembling method for a magnetic head device. (3)Multiple head assemblies for magnetic disk drives
A spacer with a central hole for each
Attach to the caulking holes of each of the multiple arm support parts of the lock,
Caulking by pressing the center hole of the spacer with a punch,
The plurality of head assemblies into an actuator block
In the head assembling method of the magnetic head device to be attached, A plurality of head assemblies mounted on the actuator block
Jig space between assemblies Insert the Press and hold the plurality of arm supports from both sides to
Contact the jig spacer Pressing from one side with the caulking punch
And a head assembling method for a magnetic head device. (4)Multiple head assemblies for magnetic disk drives
A spacer with a central hole for each
Attach to the caulking holes of each of the multiple arm support parts of the lock,
Caulking by pressing the center hole of the spacer with a punch,
The plurality of head assemblies into an actuator block
In the head assembling method of the magnetic head device to be attached, Place the plurality of arms on the actuator block
The position is supported so that it can be displaced and turned, The spacer is formed by the centripetal effect of the steel ball pressed by the caulking punch.
It is characterized by caulking while positioning the center hole of
Method for assembling a magnetic head device.